View MB3836_1019502.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27707-2E
ASSP for Power Supply Applications (For Secondary Battery)
Li-Ion Battery Protection IC
MB3836
s DESCRIPTION
The MB3836 is a lithium-ion battery protection IC for three cells series lithium-ion battery pack in a notebook PC's. This IC supports charging at 12.6 V and detects an over-charge, over-discharge, and over-current to control charging and discharging. The IC has a built-in function that makes the battery rechargeable even when the battery voltage has decreased to 0 V. Upon detection of an over-discharge from the lithium-ion battery, the IC outputs a preliminary signal to stop discharging. This feature allows the notebook PC to save its memory data to hard disk. In addition, the IC allows the battery to be used up to the over-discharge level of each cell, increasing the operating time. After detecting an over-discharge, the IC disconnects all of its biases so that its current consumption becomes 0 A. The IC can therefore make the battery pack rechargeable even when it has been left for an extended period of time with the output disconnected due to over-discharging. The battery can also be set into a quasi-over-discharged state even when the cell voltage is equal to or greater than the over-discharge detection voltage. When the notebook PC is shipped, the IC can prevent the battery pack from being discharged and turn off its bias sources, allowing the battery pack to be stored for a long time. The IC's remote on/off function can turn off the output from the detached battery pack without the need for an external logic circuit or any mechanism on the notebook PC. This prevents the output from being short-circuited by a malfunction and facilitates the handling of the battery pack itself. The MB3836 is the best IC for protecting the lithium-ion battery pack used for a notebook PC.
s PACKAGE
20-pin plastic SSOP
(FPT-20P-M03)
MB3836
s FEATURES
Power supply voltage range : 6 V to 13.5 V High-precision over-charge detection voltage : 4.325 V 0.025 V Circuit power consumption after detecting over-discharge : 0 A (Typ) Built-in quasi-over-discharge function Built-in pre-alarm function before shutting down of over-discharge Built-in remoting ON/OFF function Built-in over-discharge current detecting function with 2-step delay time : Vth = 300 mV7 ms (Typ) : Vth = 600 mV500 s (Typ) * Built-in charge recovery function for 0 V cell * * * * * * *
s PIN ASSIGNMENT
(TOP VIEW)
OCV : 1 COUT : 2 DOUT : 3 N.C. : 4 VS : 5 VCC : 6 BATH : 7 BATM : 8 BATL : 9 GND : 10
20 : OUTON 19 : PF 18 : PDWN 17 : MSW2 16 : MSW1 15 : VMON 14 : COVT 13 : COCT 12 : CUVT 11 : CPDT
(FPT-20P-M03)
2
MB3836
s PIN DESCRIPTIONS
Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin name OCV COUT DOUT N.C. VS VCC BATH BATM BATL GND CPDT CUVT COCT COVT VMON MSW1 I/O I O O O I I I O I Description Over-current state and discharging/charging state detection terminal Pch MOS control output terminal for charging control switch Pch MOS control output terminal for discharging control switch No connection "H" level output terminal for remoting ON function Power supply terminal Battery connection terminal Battery connection terminal Battery connection terminal GND terminal Capacitor connection terminal for setting power-down delay time Capacitor connection terminal for setting PF output delay time Capacitor connection terminal for setting over-current detection time Capacitor connection terminal for setting over-charge detection time Output terminal of monitoring cell voltage Switching signal of monitoring cell voltage input terminal MSW1 MSW2 VMON output L L 17 MSW2 I H H L H L H H cell voltage M cell voltage L cell voltage Cell voltage input block SW Depend on over-charge detection block Off Off Off
18
PDWN
I
Power down signal input terminal After input "H" level, Latch 3 will be set, DOUT="H" level, and OCV="L" level. At this time, all battery connecting terminal will be released, and all bias will be set OFF. PF signal output terminal Remoting ON signal input terminal After input "L" level, the bias of over-charge detection block will be set OFF. At this time, DOUT and COUT value will be equal to "H" level.
19 20
PF OUTON
O I
3
4
MB3836
s BLOCK DIAGRAM
VCC 6 bias Reference voltage block 300 mV ON/OFF 600 mV
DOUT 3
COUT 2 bias ON/OFF
OCV 1
- + - +
Delay circuit
(7 ms) (500 s)
Latch1
[Over-current detection block]
600
Reset
[Cell voltage input block]
BATH 7 100 k
x1
[Cell voltage monitoring block]
+ -
[Over-charge detection block]
Reset
Delay circuit (23 ms)
5
VS
Latch2 20 OUTON
+
BATM 8 100 k
- x1 + -
[Remote ON circuit block]
4.325 V ( 0.6%) BATL 9 100 k
x1 - - - +
[Over-discharge detection, and power fail circuit block]
19 PF
PF output time (2 s)
2.75 V (2%)
Reset
Latch3
Power down delay time (20 s)
18 PDWN
Decoder
10 GND 15 16 17 13 COCT 14 COVT VMON MSW1 MSW2
11 CPDT
12 CUVT
MB3836
s ABSOLUTE MAXIMUM RATINGS
Parameter Power supply voltage Input voltage Collector output voltage Output current Peak output current Power dissipation Operating temperature Storage temperature Symbol VCC VI VO IO IO PD Ta Tstg Conditions BATH, OCV, PDWN, OUTON, PF, MSW1, MSW2 terminals COUT terminal DOUT, COUT terminals (DC) DOUT, COUT terminals Duty = tON / t Ta + 25 C Rating Min -30 -55 Max 20 20 25 2 2 / Duty 540 * + 85 + 125 Unit V V V mA mA mW C C
* : When mounted on a 10 cm square double-sided epoxy board. WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
s RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Input voltage Output current External OCV terminal resistor Symbol VCC VI IO ROCV COVT Capacitor for setting delay time CUVT CPDT COCT Conditions OCV, PDWN, OUTON, MSW1, MSW2 terminals VS terminal Value Min 6.0 0 -10 220 0.001 0.001 220 Typ 12.6 10000 0.15 1.5 560 Max 13.5 18 0 10 Unit V V mA pF F F pF
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand.
5
MB3836
s ELECTRICAL CHARACTERISTICS
Parameter Symbol Pin No. 2, 7, 8, 9 2, 7, 8, 9 2 2 2 7, 8, 9, 19 19 19 19 19 Conditions Ta = + 25 C, Each cell voltage Ta = 0 C to + 70 C, Each cell voltage (VCC = 12.6 V, Ta = + 25 C) Value Unit Min Typ Max 4.300 4.280 0.14 11.5 2.695 1 2.0 10 0.22 0.45 4 250 VCC- 0.4 22.5 4.325 4.325 0.20 0.1 23 0.75 0 2.75 2 7* 0.75 0 3.5 50 20 0.30 0.60 7 500 45 0.6 * 4.350 4.370 0.26 0.5 34.5 1.0 0.5 2.805 3 1.0 0.5 5.0 100 30 0.38 0.75 10 750 1.0 67.5 V V V A ms V A V s ms V A V A s V V ms s V V A V
Detection voltage
VTH
Over-charge Hysteresis width detection block Input current Delay time Output voltage Output leakage current Detection voltage PF output delay time PF Min pulse width Overdischarge detection, power-fail circuit block Output voltage Output leakage current Input threshold voltage Input current Power-down delay time
VH IIN tD VOL ILEAK VTH tD1 tP VOL ILEAK VTH IIN tD2 VTH1
7, 8, 9 Each cell voltage = 4.2 V COVT = 0.01 F COUT = 1 mA COUT = 13.5 V CUVT = 0.15 F, VCC = 8.5 V CUVT = 0.15 F, VCC = 8.5 V PF = 1 mA PF = 13.5 V
3, 18 Each cell voltage = 2 V 18 3 1, 3, 13 1, 3, 13 3 3 3 3 PDWN = 5 V CPDT = 1.5 F, VCC = 8.5 V Voltage between VCC terminal and OCV terminal Voltage between VCC terminal and OCV terminal COCT = 560 pF VTH2 > VCC-OCV > VTH1 COCT = 560 pF VCC-OCV > VTH2 DOUT = 1 mA DOUT = -0.4 mA
Detection voltage VTH2 Overcurrent detection block tD1 Delay time tD2 VOL Output voltage Input current at over-charge Short cell detection voltage VOH IIN VTH
7, 8, 9 Each cell voltage = 4.5 V Cell voltage without 7, 8, 9 measuring cell = 3.6 V at COUT = "L""H"
Cell voltage input block
*: Standard design value
(Continued)
6
MB3836
(Continued)
Parameter Input thereshold voltage Input current Input resistance at power-down Remoting ON circuit block Input thereshold voltage Input current Output voltage Output current Output leakage current Voltage gain Input thereshold voltage Cell voltage Input current monitoring Output source block current Output sink current Symbol VTLH IIN RI VTH IIN VOH IO ILEAK AV VTH IIN IOH IOL ICC1 ICC2 ICC3 ICC4 * : Standard design value. Pin No. 1, 2 1 1 20 20 5 5 5 15 16, 17 Conditions OCV = 13.5 V OUTON = 13.5 V VS = -4 mA VS = 0 V VS = 0 V, Each cell voltage = 2 V Cell voltage = 2.9 V to 4.2 V Each cell voltage = 2.9 V, MON = 1.9 V Each cell voltage = 2.9 V, MON = 3.9 V VCC = 12.6 V, normal state, OUTON = 5 V VCC = 8.7 V, normal state, OUTON = 5 V VCC = 12.6 V, Cell voltage monitoring state VCC = 6 V, Shutting over-discharge state (VCC = 12.6 V, Ta = + 25 C) Value Unit Min Typ Max 0.8 480 0.8 -30 -0.5 0.98 0.8 40 1.4 10 600 1.4 13 0 1.0 1.4 50 -350 80 75 65 130 0* 2.0 20 720 2.0 17 -11 1.02 2.0 100 -180 110 95 200 V A V A V mA A V/V V A A A A A A A
VCC-0.5 VCC-0.2
16, 17 MSW1 = MSW2 = 5 V 15 15 6 6 6 6
All device
Power supply current
7
MB3836
s TYPICAL CHARACTERISTICS
Over-charge detection voltage VTH (V) Power Supply Current vs.Power Supply Voltage Power supply current ICC (A)
200 180 160 140 120 100 80 60 40 20 0 0 2 4 6 8 10 12 14 16
Normal state MSW1 = MSW2 = OPEN Cell voltage monitoring state MSW1 = OPEN MSW2 = 5 V Ta = +25 C BATH = VCC H cell voltage = M cell voltage = L cell voltage OUTON = 5 V
Over-charge Detection Voltage vs. Ambient Temperature
4.40 4.38 4.36 4.34 4.32 4.30 4.28 4.26 4.24 4.22 4.20 -40 -20 0 20 40
Typical H cell OUTON = 5 V BATH = VCC BATM = 8.4 V BATL = 4.2 V
60
80
100
Power supply voltage VCC (V) Delay time of alarm output tD (s) Delay Time on Over-charge Detection Block
1000 Ta = +25 C
Ambient temperature Ta (C) Delay Time on Over-discharge Detection Block
Ta = +25 C
100
Delay time tD (ms)
100
10
10
1
1
0.1
0.1 100
1000
10000
100000
0.01 0.0001
0.001
0.01
0.1
1
10
Capacitor for setting delay time COVT (pF)
Power failure permission signal wait time tD (s)
Capacitor for setting alarm output time CUVT (F) Delay Time of Over-current Detection
100 tD1 VCC - OCV = 0.5 V Ta = +25 C
Delay Time on Over-discharge Detection Block
1000 100 10 1 0.1 0.01 0.0001 Ta = +25 C
Delay time tD1, tD2 (ms)
10
1 tD2 VCC - OCV = 1 V 1000 10000
0.001
0.01
0.1
1
10
0.1 100
Capacitor for setting power failure permission signal wait time CPDT (F)
Capacitor for setting delay time COCT (pF)
(Continued)
8
MB3836
(Continued)
Power Dissipation vs. Ambient Temperature Characteristics
600
Power dissipation PD (mW)
540 500 400 300 200 100 0 -40 -20 0 20 40 60 80 100
Ambient temperature Ta (C)
9
MB3836
s FUNCTIONAL DESCRIPTION
(1) Over-charge Detection Block When the battery is being charged, the over-charge detection block monitors each cell voltage. If any cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ) as in Figure 1 (see "1. Over-charge detection block and cell voltage input block " in "sOPERATION TIMING CHART"), the COUT terminal (pin 2) goes "H" level, after a delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND, to turn off the Pch MOS FET for external charge control, thereby stopping charging the battery. When all the cell voltages in the over-charge detected state become the over-charge release voltage (4.125 V Typ) or less, the COUT terminal (pin 2) goes "L" level to turn on the Pch MOS FET for external charge control. Even when a cell voltage reaches or exceeds the over-charge detection voltage as in Figure 2, the cell voltage does not enter the over-charge detected state if it falls below the over-charge detection voltage within the delay time (23 ms Typ). (2) Cell Voltage Input Block If any cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ) as in Figures 1 and 2 (see "1. Over-charge detection block and cell voltage input block" in "sOPERATION TIMING CHART"), the COUT terminal (pin 2) goes high to turn off the Pch MOS FET for external charge control after a delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND. At the same time, the cell voltage input block switch for the cell exceeding the over-charge detection value is turned on to supply the cell voltage input current to that cell so that high-voltage cells are lowered in voltage. When the cell voltage in the over-charge detected state becomes the over-charge release voltage ( 4.125 V Typ) or less, the cell voltage input block switch is turned off. (3) Over-discharge Detection/Power Fail Circuit Block When the battery is being discharged, the over-discharge detection/power fail circuit block monitors each cell voltage. If any cell voltage becomes the over-discharge detection voltage (2.75 V Typ) as in Figure 5 (see "3. Over-discharge detection/power fail circuit" in "sOPERATION TIMING CHART"), the PF terminal (pin 19) outputs a "L" level PF signal to the notebook PC after a PF output delay time (2 s Typ) managed by the capacitor (CUVT) connected between the CUVT terminal (pin 12) and GND. At the same time, after a power-down delay time (20 s Typ) managed by the capacitor (CPDT) connected between the CPDT terminal (pin 11) and GND, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, thereby stopping discharging the battery. (4) Over-current Detection Block The over-current detection block monitors the discharge current from the battery. It detects an over-current if the potential difference between the VCC and OCV terminals by RON of Pch MOS FET for external charge control becomes 300 mV or more as in Figure 6 (see "4. Over-current detection block 1" in "sOPERATION TIMING CHART"). After a delay time (7 ms Typ) managed by the capacitor (COCT) connected between the COCT terminal (pin 13) and GND, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, thereby stopping discharging the battery. When the discharge current is large, if the potential difference between the VCC and OCV terminals becomes 600 mV or more as in Figure 7 (see "5. Over-current detection block 2" in "sOPERATION TIMING CHART"), the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, thereby stopping discharging the battery, after a power-down delay time (500 s Typ) managed by the capacitor (COCT) connected between the COCT terminal (pin 13) and GND. Note that, if an over-current is detected, the VS terminal (pin 5) goes "L" level in the same way as when the overdischarge detection function works. As discharging is stopped, the OCV terminal (pin 1) goes "L" level to 10
MB3836
completely turn off the bias source of this IC, so that the battery pack enters the power-down state. To return from that state, perform recharging operation, or set the OCV terminal (pin 1) to "H" level. (5) Remote ON Circuit Block When the battery pack is detached from the notebook PC, the OUTON terminal (pin 20) pulled up to the VS terminal (pin 5) on the notebook PC side goes "L" level to turn off the bias of the over-current detection block. At the same time, the COUT terminal (pin 2) and DOUT terminal (pin 3) go "H" level to turn off the Pch MOS FET for external charge/discharge control. Even when the OUTON terminal (pin 20) is "L" level with charging/discharging off, the IC is operating and the over-discharge detection function is working to protect the battery. If the VS terminal (pin 5) is "H" level, connecting the battery pack to the main unit makes it readily available. (6) Cell Voltage Monitor Block The cell to be monitored can be selected depending on the voltage levels at the MSW1 terminal (pin 16) and MSW2 terminal (pin 17). When the monitor function is operating, the cell voltage input block switch does not work even when an over-charge is detected. Condition of monitoring cell voltage Voltage level at MSW1 terminal L L H H Voltage level at MSW2 terminal L H L H VMON output H cell voltage M cell voltage L cell voltage SW at cell voltage input block Depend on over-charge detection block Off Off Off
11
MB3836
s SETTING DELAY TIME for OVER-CHARGE DETECTION BLOCK
For over-charge detection, you can set the delay time from when charging the capacitor (COVT) connected to the COVT terminal (pin 14) is started and the COVT terminal voltage increases until the COUT terminal (pin 2) voltage goes "H" level (with the open-collector output off) with the COVT terminal at the threshold voltage. Over-charge detection block delay time : tD (s) = 2.3 x COVT (F) :
s SETTING PF OUTPUT DELAY TIME
For over-discharge detection, you can set the delay time from charging the capacitor (CUVT) connected to the CUVT terminal (pin 12) is started and the CUVT terminal voltage increases until the PF terminal (pin 19) voltage goes "L" level with the CUVT terminal at the threshold voltage. PF output delay time : tD1 (s) = 13.3 x CUVT (F) :
s SETTING POWER-DOWN DELAY TIME
You can set the delay time from charging the capacitor (CPDT) connected to the CPDT terminal (pin 11) is started after "L" level output to the PF terminal (pin 19) at over-discharge detection and the CPDT terminal voltage increases until the DOUT terminal (pin 3) voltage goes high with the CPDT terminal at the threshold voltage. Power-down delay time : tD2 (s) = 13.3 x CPDT (F) : After the DOUT terminal goes "H" level to stop overdischarging, the OCV terminal (pin 1) goes "L" level to turn off the entire internal circuitry of the IC so that the circuit current becomes 0 A. Considering the time constant based on the notebook PC's capacitor connected to the OCV terminal, the discharge time constant of CPDT terminal is used to prevent recovery (return) and shutdown (power-down) from being repeated in response to variations in battery voltage. The capacitor connected to the OCV terminal on the notebook PC side requires the restriction expressed below based on the value of the capacitor (CPDT) connected to the CPDT terminal. OCV terminal external capacitor : COCV (F) < 1790 x CPDT (F)
s SETTING DELAY TIME for OVER-CURRENT DETECTION BLOCK
For over-current detection when 0.6 V (Typ) > VCC - OCV > 0.3 V (Typ), you can set the delay time from when charging the capacitor (COCT) connected to the COCT terminal (pin 13) is started and the COCT terminal voltage increases until the DOUT terminal (pin 3) voltage goes "H" level with the COUT terminal at the threshold voltage. Over-current detection block delay time : tD1 (s) = 12.5 x COCT (F) : For over-current detection when VCC - OCV > 0.6 V (Typ), you can set the delay time from when charging the capacitor (COCT) connected to the COCT terminal (pin 13) is started and the COCT terminal voltage increases until the DOUT terminal (pin 3) voltage goes "H" level with the COCT terminal at the threshold voltage. Over-current detection block delay time : tD2 (s) = 0.9 x COCT (F) :
12
MB3836
s OPERATION at LOW VOLTAGE
If cell voltages cause extreme imbalance or one or more cells enter the short-circuited state (0.6 V Typ) or less, the short-circuit cell detection function sets the COUT terminal (pin 2) to "H" level (with the open-collector output off). If the VCC terminal (pin 6) voltage becomes 4.2 V (Typ) or less, however, the short-circuit cell detection function is disabled, the COUT terminal (pin 2) goes "L" level, enabling 0 V cell charging, with the OCV terminal (pin 1) at a voltage of 1.4 V (Typ) or higher. When VCC is less than 4.2 V, the DOUT terminal (pin 3) is fixed at "H" level.
13
MB3836
s OPERATION TIMING CHART
1. Over-charge Detection Block and Cell Voltage Input Block
(1) When cell 3 does not exceed VTH and cells 1 and 2 are lowered in voltage by cell voltage input current and self-discharging If any cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the COUT terminal (pin 2) goes "H" level to turn off the Pch MOS FET for external charge control, after a delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND, thereby stopping charging the battery. At this time, the cell voltage input block switch is turned on to supply the cell voltage input current to that cell so that high-voltage cells are lowered in voltage. When all the cell voltages in the over-charge detected state become the over-charge release voltage (4.125 V Typ) or less, the COVT terminal (pin 14) and COUT terminal (pin 2) go "L" level to turn on the Pch MOS FET for external charge control. When any cell voltage in the over-charge detected state becomes the over-charge release voltage (4.125 V Typ) or less, the cell voltage input block switch is turned off.
VTH (4.325 V)
Cell voltage
VH (0.2 V) (4.125 V) (45 A) (0 A) (45 A) (0 A) (6.26 V)
Cell 1 Cell 2
Cell 1 Cell voltage input current Cell 2
COVT terminal
COUT terminal
tD (23 ms)
Figure 1
14
MB3836
(2) When the voltage is lowered by cell voltage input current and self-discharge after pulsed charge Even when a cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the cell voltage does not enter the over-charge detected state if it falls below the over-charge detection voltage (4.325 V Typ) within the delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND. If a cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the COUT terminal (pin 2) goes "H" level to turn off the Pch MOS FET for external charge control, stopping charging the battery, after a delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND. At this time, the cell voltage input block switch is turned on to supply the cell voltage input current to that cell so that high-voltage cells are lowered in voltage. When all the cell voltages in the over-charge detected state become the over-charge release voltage (4.125 V Typ) or less, the COVT terminal (pin 14) and COUT terminal (pin 2) go "L" level to turn on the Pch MOS FET for external charge control. When any cell voltage in the over-charge detected state becomes the over-charge release voltage (4.125 V Typ) or less, the cell voltage input block switch is turned off.
VTH (4.325 V)
Cell voltage
VH (0.2 V) (4.125 V) (45 A) (0 A)
Cell voltage input current
(6.26 V)
COVT terminal
COUT terminal
tD (23 ms)
Figure 2
15
MB3836
(3) When the OUTON terminal changes "H""L""H" after detection of an over-charge
VTH (4.325 V)
Cell voltage
VH (0.2 V) (4.125 V) (45 A) (0 A)
Cell voltage input current
COVT terminal
(6.26 V)
COUT terminal
OUTON terminal
DOUT terminal
OCV terminal
(0 V)
VS terminal
(0 V) tD (23 ms)
Figure 3 When the OUTON terminal (pin 20) changes from "H" level to "L" level after detection of an over-charge, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, thereby setting the OCV terminal (pin 1) to "L" level. When the OUTON terminal (pin 20) changes from "H" level to "L" level after all the cell voltages in the overcharge detected state become the over-charge release voltage (4.125 V Typ) or less, the COUT terminal (pin 2) goes "L" level to turn on the Pch MOS FET for external charge control. When the OCV terminal (pin 1) changes from "L" level to "H" level at this time, the DOUT terminal (pin 3) goes "L" level to turn on the Pch MOS FET for external discharge control. 16
MB3836
2. Over-charge Detection Block, Discharge Detection Block, and Cell Voltage Input Block
* When battery is discharged after detection of an over-charge or re-discharged after detection of an over-charge by recharging If a cell voltage reaches or exceeds the over-charge detection voltage (4.325 V Typ), the COUT terminal (pin 2) goes "H" level to turn off the Pch MOS FET for external charge control after a delay time (23 ms Typ) managed by the capacitor (COVT) connected between the COVT terminal (pin 14) and GND. This stops charging the battery and puts it into the over-charge detected state. When a discharge is started in the over-charge detected state, the OCV terminal voltage is lowered by the body diode voltage of the Pch MOS FET for external charge control. When the potential difference between the VCC terminal and OCV terminal (pin 1) becomes 300 mV or more, the COUT terminal (pin 2) goes "L" level to turn on the Pch MOS FET for external charge control and the cell voltage input block switch is turned off at the same time. An over-charge caused by recharging can be detected even with cell voltages remaining above the over-charge release voltage (4.125 V Typ).
Discharge start
Charge start
Discharge start
VTH (4.325 V)
Cell voltage
VH (0.2 V) (4.125 V) (45 A) (0 A) (6.26 V)
Cell voltage input current
COVT terminal
COUT terminal
OCV terminal
(VCC) VTH (VCC - 0.3 V) tD (23 ms) tD (23 ms)
Figure 4
17
MB3836
3. Over-discharge Detection/Power Fail Circuit
* When no "H" level signal is input to the PDWN terminal after over-discharge detection If any cell voltage becomes the over-discharge detection voltage (2.75 V Typ), the PF terminal (pin 19) outputs a "L" level PF signal to the notebook PC after a PF output delay time (2 s Typ) managed by the capacitor (CUVT) connected between the CUVT terminal (pin 12) and GND. At the same time, after a power-down delay time (20 s Typ) managed by the capacitor (CPDT) connected between the CPDT terminal (pin 11) and GND, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, thereby stopping discharging the battery. The VS terminal (pin 5) goes "L" level at this time. As discharging is stopped, the OCV terminal (pin 1) goes "L" level to completely turn off the bias source in the IC. That is, an over-discharge state is detected when a cell voltage does not return to the over-discharge detection voltage (2.75 V Typ) or more within the power-down delay time (20 s Typ), an over-discharge state is detected. When the OCV terminal (pin 1) goes "H" level, the DOUT terminal (pin 3) goes "L" level to turn on the Pch MOS FET for external discharge control and the VS terminal (pin 5) goes "H" level. If the cell voltage remains not exceeding the over-discharge detection voltage (2.75 V Typ) at this time, the PF terminal (pin 19) outputs a "L" level PF signal to the notebook PC again after a PF output delay time (2 s Typ) managed by the capacitor (CUVT) connected between the CUVT terminal (pin 12) and GND. If the cell voltage reaches or exceeds the overdischarge detection voltage (2.75 V Typ) within the power-down delay time (20 s Typ), however, the PF terminal goes "H" level and an over-discharge state is not detected.
18
MB3836
Charge start Cell voltage
VTH (2.75 V)
(4.9 V)
CUVT terminal
PF terminal
CPDT terminal
(4.9 V)
PDWN terminal DOUT terminal
0V
OCV terminal
0V
OUTON terminal
0V
VS terminal
0V tD1 (2 s) tD2 (20 s) tD1 (2 s)
Internal bias : Off Figure 5
19
MB3836
4. Over-current Detection Block 1
When a discharge current is relatively small as an over-current, if the potential difference between the VCC terminal and OCV terminal (pin 1) by RON of the Pch MOS FET for external charge control becomes 300 mV or more, the capacitor (COCT) connected between the COCT terminal (pin 13) and GND is charged. No overcurrent is detected if the OCV terminal voltage returns to the battery voltage level within the delay time (7 ms Typ). If the potential difference between the VCC terminal and OCV terminal (pin 1) by RON of the Pch MOS FET for external charge control becomes 300 mV or more again, an over-current is detected after a delay time (7 ms Typ) managed by the capacitor (COCT) connected between the COCT terminal (pin 13) and GND. At this time, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control and the bias source in the IC is completely turned off as well. Recharging can be restarted by setting the OCV terminal (pin 1) to "H" level to set the DOUT terminal (pin 3) to "L" level and VS terminal (pin 5) to "H" level, respectively.
Charge start
(VCC)
OCV terminal
VTH (VCC - 0.3 V) VTH (VCC - 0.6 V) 0V (5.8 V)
COCT terminal
DOUT terminal
VS terminal
0V
tD (7 ms)
Internal bias : Off
Figure 6
20
MB3836
5. Over-current Detection Block 2
When a discharge current is relatively large as an over-current, if the potential difference between the VCC terminal and OCV terminal (pin 1) by RON of the Pch MOS FET for external charge control becomes 300 mV or more, the capacitor (COCT) connected between the COCT terminal (pin 13) and GND is charged. No overcurrent is detected if the OCV terminal voltage returns to the battery voltage level within the delay time (7 ms Typ). If the potential difference between the VCC terminal and OCV terminal (pin 1) of the Pch MOS FET for external charge control becomes 600 mV or more, an over-current is detected after a delay time (500 ms Typ) managed by the capacitor (COCT) connected between the COCT terminal (pin 13) and GND. At this time, the DOUT terminal (pin 3) goes "H" level to turn off the Pch MOS FET for external discharge control, both of the VS terminal (pin 5) and OCV terminal (pin 1) go "L" level, and the bias source in the IC is completely turned off as well. Recharging can be restarted by setting the OCV terminal (pin 1) to "H" level to set the DOUT terminal (pin 3) to "L" level and VS terminal (pin 5) to "H" level, respectively.
Charge start
(VCC)
OCV terminal
VTH (VCC - 0.3 V) VTH (VCC - 0.6 V) 0V (5.8 V)
COCT terminal
DOUT terminal
VS terminal
0V
tD (500 s)
Internal bias : Off
Figure 7
21
MB3836
s TREATMENT WHEN VOLTAGE MONITOR FUNCTION IS NOT USED
When the voltage monitor function is not used, connect the MSW1 terminal (pin 16) and MSW2 terminal (pin 17) to GND by taking their shortest ways and leave the VMON terminal (pin 15) open.
MSW2 17
MSW1 16
"Open"
VMON 15
When voltage monitor function is not used
s NOTE ON VS TERMINAL
If the battery is charged through the body diode of the internal Pch MOS FET connected to the VS terminal (pin 5), the over-charge protection function cannot be disabled. Be careful not to apply a voltage equal to or higher than the VCC terminal voltage to the VS terminal.
s NOTE ON ELECTROSTATIC APPLICATION
This IC has a built-in function to set ICC to 0 A in power-down mode to extend the battery life. As a charger is required to return the IC from power-down mode, use meticulous care not to let it malfunction, for example, with applied static electricity. To prevent electrostatic noise from coming into each input pin of the IC, it is advisable to lower impedance, for example, by adding a capacitor. The capacitor used for this purpose should be placed as close to the IC as possible.
22
MB3836
s I/O TERMINAL EQUIVALE CIRCUIT
[Over-current detection block]
OCV 1 VCC 6
300 k
300 k
ESD protection element
3 2 k
GND 10 COCT 13
[Over-discharge detection/power fail circuit block]
PDWN 18 VCC
[Over-charge detection block]
VCC
COUT
2 2 k 1 k 100 k 2 k
CUVT 12
500 k 2 k
20 k
COVT 14
GND GND PF 19 CPDT 11
[Cell voltage input block]
BATH 7
100 k
[Remote ON circuit block]
20 OUTON
X1
VCC
BATM 8
100 k
X1
OCV
600
50
BATL
9 100 k
1 M
X1
700 k
GND
GND
55 VS
[Cell voltage monitor block]
17 MSW2 16 MSW1
VCC
15 VMON 100 k 100 k
100 k
100 k
GND
23
24
Pch MOS FET for charge control Pch MOS FET for discharge control
C14 0.1 F (+) C13 0.1 F R6 10 OCV ZD1 18 V
C15 0.1 F
MB3836
R9 1 M R13 10 k DOUT 3 bias ON/OFF 600 2 1 COUT
M1
M2
VCC
R5 1 M R14 10 k
6 bias 300 mV
+ - -
Reference voltage source
Delay circuit
[Over-current detection block]
C1 600 mV
+
ON/OFF
(7 ms) (500 s) Latch1
s APPLICATION EXAMPLE
H cell
+ - x1 + -
Note PC side
M cell
L cell
Litium-Ion battery Reset
VS 5
x1 +
0.1 F
R1
[Cell voltage monitor block] [Over-charge
BATH
[Cell voltage input block]
7
R4
1 M
1 k
Reset
Delay circuit (23 ms)
detection block]
Latch2
100 k
-
OUTON 20 R7
100
R2
BATM
8
1 k
[Remote ON circuit block]
100 k
100 k
R8
R3
x1 + - - -
BATL
4.325 V (0.6%)
9
[Over-discharge detection/ power fail circuit block]
PF 19
1 k 2.75 V (2%)
100 k
PF output time (2 s)
Reset
Latch3
Power down delay time (20 s)
PDWN 18
Decoder
13
10
11
12
GND
C12 CPDT C2 1.5 F CUVT C5 0.15 F 0.22 F (G)
15 16 17 VMON MSW1 MSW2 C9 C10 C11 4700 pF 4700 pF 4700 pF
14 COCT COVT C7 C6 560 pF 0.01F
MB3836
s PARTS LIST
COMPONENT M1, M2 ZD1 C1 C2 C5 C6 C7 C9, C10, C11 C12 C13, C14, C15 R1, R2, R3 R4, R5, R9 R6 R7 R8 R13, R14
ITEM
SPECIFICATION VDS = -30 V 200 mW, 18 V 7% 0.1 F 1.5 F 0.15 F 560 pF 0.01 F 4700 pF 0.22 F 0.1 F 1 k 1 M 10 100 100 k 10 k 25 V (10%) 16 V (10%) 16 V (10%) 50 V (5%) 25 V (10%) 25 V (10%) 25 V (10%) 25 V (10%) 1/16 W, 5% 1/16 W, 5% 1/16 W, 5% 1/16 W, 5% 1/16 W, 5% 1/16 W, 5%
VENDOR VISHAY SILICONIX TOSHIBA
PARTS No. Si4425DY 02CZ18-Y
FET Diode Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Resistor Resistor Resistor Resistor Resistor Resistor

Note: VISHAY SILICONIX : VISHAY Intertechnology, Inc. TOSHIBA : TOSHIBA CORPORATION
s USAGE PRECAUTION
*Printed circuit board ground lines should be set up with consideration for common impedance. *Take appropriate static electricity measures. * Containers for semiconductor materials should have anti-static protection or be made of conductive material. * After mounting, printed circuit boards should be stored and shipped in conductive bags or containers. * Work platforms, tools, and instruments should be properly grounded. * Working personnel should be grounded with resistance of 250 k to 1 M between body and ground.
25
MB3836
s ORDERING INFORMATION
Part number MB3836PFV Package 20-pin plastic SSOP (FPT-20P-M03) Remarks
26
MB3836
s PACKAGE DIMENSION
20-pin plastic SSOP (FPT-20P-M03)
*1 6.500.10(.256.004)
20 11
Note 1) *1: Resin protrusion. (Each side: +0.15 (.006) Max). Note 2) *2: These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder.
0.170.03 (.007.001)
INDEX
*24.400.10 6.400.20 (.173.004) (.252.008)
Details of "A" part 1.25 -0.10 .049 -.004 LEAD No.
1 10
+0.20 +.008
(Mounting height)
0.65(.026)
"A" 0.240.08 (.009.003) 0.13(.005)
M
0~8 0.100.10 (Stand off) (.004.004) 0.25(.010)
0.10(.004)
0.500.20 (.020.008) 0.600.15 (.024.006)
C
2003 FUJITSU LIMITED F20012S-c-4-6
Dimensions in mm (inches). Note: The values in parentheses are reference values.
27
MB3836
FUJITSU LIMITED
All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device; Fujitsu does not warrant proper operation of the device with respect to use based on such information. When you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. Fujitsu assumes no liability for any damages whatsoever arising out of the use of the information. Any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of Fujitsu or any third party or does Fujitsu warrant non-infringement of any third-party's intellectual property right or other right by using such information. Fujitsu assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would result from the use of information contained herein. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that Fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan.
F0310 (c) FUJITSU LIMITED Printed in Japan

▲Up To Search▲

Price & Availability of MB3836

	To Download MB3836 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .