View ISL9220B10_4936158.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Switching Charger for 1-Cell Li-ion Batteries
ISL9220B
The ISL9220B is a cost-effective and versatile battery charger for 1-cell Li-Polymer based portable applications. The device features synchronous PWM technology, maximizing power efficiency, thus minimizing charge time and heat. The 1.2MHz switching frequency allows use of small external inductors and capacitors. A simple charge current programming method is provided. External resistors program the fast charge and end-of-charge currents. The two status outputs can be used to drive LEDs, or can be connected to the host processor. A programmable charge timer provides the ability to detect defective batteries, and provides a secondary method of detecting charge termination. A thermistor interface is provided for battery presence detection, and for temperature qualified charging conditions. Additional features include preconditioning of an over-discharged battery, automatic recharge, and thermally enhanced QFN package.
ISL9220B
Features
* Highly Integrated Battery Charger IC * Charges 1 Li-ion or Li-Polymer Batteries * Up to 2A Charge Current * Synchronous Buck Topology, with Integrated Power FETs * 1.2MHz Switching Frequency * 0.5% Charge Voltage Accuracy * Input Current Limit Programmable with One External Resistor * Thermistor Interface for Battery Detection and Temperature Qualified Charging * Two Status Outputs * Programmable Charge Safety Timer * Short-Circuit and Thermal Protection * Small 4x4mm TQFN Package * -40C to +85C Operating Temperature Range
Related Literature
* Technical Brief TB363 "Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)" * Technical Brief TB379 "Thermal Characterization of Packaged Semiconductor Devices" * Technical Brief TB389 "PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages"
Applications
* PDAs and Smart Phones * MP3 and Portable Media Players * Handheld GPS Devices * Digital Still Cameras * Industrial Handheld Scanners
Pin Configuration
ISL9220B (20 LD TQFN) TOP VIEW
July 2, 2010 FN7652.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL9220B
Pin Descriptions
PIN PIN # NAME 1 2 3 4 5 6 7 8 9 10, 11 12 13, 14 15, 16 17 18 19 DESCRIPTION STAT2 Open-drain indication pin. In conjunction with STAT1 this pin provides a unique indication for each charging state of the cycle. This pin is capable to sink 10mA minimum current to drive an LED. EN IC enable input. Drive this pin to logic LO to enable the charger. Drive this pin to logic HI to disable the charger. Do not leave this pin floating.
AGND Analog ground. ISET1 Charge current programing pin. Connect a resistor between this pin and the GND pin to set the charge current. ISET2 End-of-charge current programing pin. Connect a resistor between this pin and the GND pin to set the end-of-charge current. VBAT ISNS CISP CISN VIN VHI SW Battery connection pin. Connect this pin to the battery. A 10F or larger X5R ceramic capacitor is recommended for decoupling and stability purposes. Output current sense pin. Connect a current sense resistor from this pin to VBAT. No decoupling capacitor is needed at this pin. Input current sense positive connection pin. Connector a sense resistor from this pin the CISN. Input current sense negative connection pin. Connector a sense resistor from this pin the CISP. Input supply voltage. Connect a 4.7F ceramic capacitor from VIN to PGND. High side NMOS FET gate drive supply pin. Connect a Schottky diode from VBIAS to this pin, and a 0.1F capacitor to AGND, as shown in the "Typical Application" diagram on page 6. Switch node and inductor connection pin.
PGND Power ground. VBIAS Internal 5V regulator output. Connect a 1F ceramic capacitor from this pin to AGND. RTH TIME Input for an external NTC thermistor for battery temperature monitoring. The TIME pin sets the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also provides a time reference for the charger. The timer function can be disabled by connecting the TIME pin to GND. If the timer is disabled, there will be no timeout function for any operation mode including trickle charge and fast charge modes.
20
STAT1 Open-drain indication pin. In conjunction with STAT2 this pin provides a unique indication for each charging state of the cycle. This pin is capable to sink 10mA minimum current to drive an LED. PD Exposed pad. Connect to GND electrically. Thermally, connect as much as possible copper to this pad either on the component layer or other layers through thermal vias to enhance the thermal performance.
Ordering Information
PART NUMBER (Notes 1, 2, 3) ISL9220BIRTZ-T NOTES: 1. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL9220B. For more information on MSL please see techbrief TB363. PART MARKING 922 0BIRTZ TEMPERATURE RANGE (C) -40 to +85 PACKAGE Tape & Reel (Pb-Free) 20 Ld 4x4 TQFN PKG. DWG. # L20.4x4E
2
FN7652.1 July 2, 2010
ISL9220B
Absolute Maximum Ratings
VIN, CISP, CISN. . . . . . . . . . . . . . . . . . . . . . . -0.3V to 18V SW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.7V to 18V VHI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 24V VBAT, ISNS . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 10V ISET1, ISET2, RTH, VBIAS, STAT1, STAT2, EN. -0.3V to 5.5V TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.75V Input Current (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . .2.0A Output Current (SW) . . . . . . . . . . . . . . . . . . . . . . . . .2.2A ESD Rating Human Body Model (Tested per JESD22-A114F) . . . . 2500V Machine Model (Tested per EIA/JESD22-A115-A) . . . . 175V Charged Device Model (Tested per JES22-C101D) . . . 1500V Latch-Up (Tested per JESD-78B; Class 2 (+85C), Level A) . . . . 100mA
Thermal Information
Thermal Resistance (Typical) JA (C/W) JC (C/W) 4x4 QFN Package (Notes 4, 5) . . . 40 4.3 Maximum Junction Temperature (Plastic Package) . . . +150C Maximum Storage Temperature Range . . . . -65C to +150C Pb-free reflow profile . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . -40C to +85C Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . 4.5V to 14V Programmable Charge Current . . . . . . . . . . . . 200mA to 2A
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty.
NOTES: 4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 5. JC, "case temperature" location is at the center of the exposed metal pad on the package underside.
Electrical Specifications
Typical specifications are measured at the following conditions: TA = +25C; VVIN = 5V. SYMBOL TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITS
PARAMETER POWER-ON RESET Rising VIN Threshold Falling VIN Threshold VIN-VBAT OFFSET VOLTAGE Rising Offset Threshold Falling Offset Threshold SUPPLY CURRENT VIN Pin Supply Current
VPOR_R VPOR_F
3.4 2.2
3.6 2.4
3.8 2.6
V V
VOS_R VOS_F
10
95 65
150 -
mV mV
ICC(VIN)
(Note 7) PGOOD = TRUE, EN = L PGOOD = TRUE, EN = H VIN = 5V to 12V
-
10 2
15 0.5 5
mA mA A
Battery Discharge Current (Total of currents flowing into VBAT, ISNS, SW pins) OVERVOLTAGE PROTECTION Input OVP Rising Threshold Input OVP Falling Threshold OUTPUT CURRENT Fast Charge Current Accuracy
IDIS
VIN < VPOR or EN = H 2V < VBAT < 11V
VIN_OVPR VIN_OVPF
14.5 14.0
15.0 14.5
15.5 15.0
V V
ICHG
RSNS = 0.039 RISET1 = 49.9k (Nominal IOUT = 1000mA) RSNS = 0.039 RISET2 = 300k (Nominal IMIN = 100mA)
-10
-
10
%
Charge Termination Current Accuracy
IMIN
-35
-
35
%
Charge Termination Detection Deglitch Time
-
12
-
ms
3
FN7652.1 July 2, 2010
ISL9220B
Electrical Specifications
Typical specifications are measured at the following conditions: TA = +25C; VVIN = 5V. (Continued) SYMBOL IPCHG VPCHG TEST CONDITIONS VBAT < VPCHG MIN (Note 6) 25 2.42 TYP 50 2.5 MAX (Note 6) UNITS 90 2.56 mA V
PARAMETER Pre-Charge Current Range (Linear Mode) Pre-Charge Threshold Voltage RECHARGE THRESHOLD Recharge Voltage Threshold TEMPERATURE MONITORING High Battery Temperature Threshold Low Battery Temperature Threshold Battery Removal Threshold Thermistor Disable Threshold Temperature Threshold Hysteresis Temperature Detection Deglitch Time THERMAL PROTECTION Thermal Shutdown Threshold Thermal Hysteresis VBIAS OUTPUT Output Voltage Output Current OSCILLATOR Oscillation Period
VRECHG
3.85
4.0
4.1
V
VTMIN VTMAX VRMV VT_DIS VT,HYS
Specified as % of VBIAS Specified as % of VBIAS Specified as % of VBIAS
30 70 90 -
35 75 95 250 180 12
40 80 -
% % % mV mV ms
TFD THYS
-
140 30
-
C C
VBIAS IBIAS
5.3 < VIN < 15V, IVBIAS = 5mA 5.3 < VIN < 15V
4.70 -
5.0 -
5.25 5
V mA
TOSC
CTIME = 15nF
-
3.0
-
ms
SWITCHING CHARGER AC CHARACTERISTICS Switching Frequency Maximum Duty Cycle Minimum Duty Cycle Cycle-By-Cycle Current Limit ILIM FOSC DMAX 1.02 1.2 96 0 3.0 1.38 MHz % % A
SWITCHING CHARGER DC CHARACTERISTICS High-Side MOSFET ON-resistance Combined High-Side ON-resistance (Note 8) Low Side MOSFET ON-resistance High-Side Path Reverse Leakage Current Charger Output Voltage rDS(ON), HS1 rDS(ON), HS2 Measured between VIN and SW pins rDS(ON), L IREV VCHG VIN = 0V, VSW = 15V IOUT = 100mA, TA = +25C IOUT = 100mA INPUT CURRENT SENSE AMPLIFIER Input Bias Current at CSIP and CSIN, Pin (Charger Enabled) Input Current Limit Threshold IISIP_ON IIN_LIM EN = L CSIP-CSIN 88 100 100 200 112 A mV 4.179 4.158 112 224 72 1.0 4.2 4.2 450 180 5.0 4.221 4.242 m m m A V V
4
FN7652.1 July 2, 2010
ISL9220B
Electrical Specifications
Typical specifications are measured at the following conditions: TA = +25C; VVIN = 5V. (Continued) SYMBOL TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITS
PARAMETER
OUTPUT CURRENT SENSE AMPLIFIER Input Bias Current at ISNS Pin, (Charger Enabled) Input Bias Current at ISNS Pin, (Charger Disabled) Input Bias Current at VBAT Pin, (Charger Enabled) Input Bias Current at VBAT Pin, (Charger Disabled) LOGIC INPUT AND OUTPUTS EN Pin Logic High EN Pin Logic Low STAT1, STAT2 Sink Current when ON STAT1, STAT2 Leakage Current when OFF NOTES: 6. Parameters with MIN and/or MAX limits are 100% tested at +25C, unless otherwise specified. Temperature limits established by characterization and are not production tested. 7. PGOOD is defined as when VIN and VBAT meet all these conditions: 1. VIN > VPOR, 2. VIN-VBAT > VOS, 3. VIN < VINOVP. 8. Limits should be considered typical and are not production tested. Pin Voltage = 0.4V Pin Voltage = 4.2V 1.3 10 0.4 1 V V mA A IISNS_ON IISNS_OFF IVBAT_ON IVBAT_OFF EN = L EN = H EN = L EN = H 100 75 200 1 100 1 A A A A
5
FN7652.1 July 2, 2010
ISL9220B
Typical Application
6
FN7652.1 July 2, 2010
ISL9220B
Block Diagram
7
FN7652.1 July 2, 2010
ISL9220B
Theory of Operation
The ISL9220B is an integrated charger optimized for charging 1-cell Li-ion or Li-polymer batteries. It charges a battery with the constant current (CC) and constant voltage (CV) profile. The typical charge profile is shown in Figure 1.
FIGURE 2. THERMISTOR INTERNAL CIRCUIT
FIGURE 1. TYPICAL CHARGE PROFILE
POR and Power-Good
The ISL9220, ISL9220A resets itself when VIN undergoes transition from below VPOR to above VPOR threshold. The ISL9220B has an internal PGOOD signal. Charging is prohibited if PGOOD is not true. See Note 7 on page 5 of the "Electrical Specifications" table for the definition of PGOOD.
Valid Charge Temperatures
An external NTC thermistor can be used to provide temperature-qualified charging. The VBIAS supply is used as a reference for the internal comparators. Thus, it is important that the VBIAS supply also be used to bias the external voltage divider comprised of one or more fixed resistors and the thermistor. This scheme allows for the use of a wide variety of thermistors. The RTH comparator block monitors the RTH pin voltage to determine if the battery temperature is within safe charging limits. The ISL9220B uses two comparators (CP2 and CP3) to form a window comparator, as shown in Figure 2. When the NTC pin voltage is "out of the window", determined by the VTMIN and VTMAX, the ISL9220B stops charging and indicates a suspend condition. When the temperature returns to the set range, the charger resumes charging. The two MOSFETs, Q1 and Q2, produce hysteresis for both upper and lower thresholds. The temperature window is shown in Figure 3 for a 0C to +50C typical application using an industry standard type 103AT thermistor. The temperature qualification function can be disabled by connecting the RTH pin to ground.
FIGURE 3. THRESHOLD VOLTAGES FOR 0C to +50C WINDOW (VBIAS = 5.0V)
Battery Detection
The presence or absence of the external thermistor is used to detect a battery. When VRTH is greater than VRTH,PRES, i.e. when RTH pin is not connected to ground, battery detection is provided by the RTH comparator block, as shown in Figure 2. With no battery connected, the RTH pin is pulled to VBIAS by RU, and thus VRTH will exceed the VRTH,(NOBAT) threshold. The internal battery presence signal is deglitched with a 12ms deglitcher, to avoid false indication of battery insertion or removal due to contact bounce or other noise.
Battery Precharge
When the charger is first enabled and no fault conditions are detected, if the battery connecting to the charger is deeply discharged, the charger will charge the battery in a reduced current for the battery to recover
8
FN7652.1 July 2, 2010
ISL9220B
If the battery voltage is less than the pre-charge voltage (VPCHG), the charger operates in LDO mode, with an output current fixed at 50mA typical. In this mode, the output voltage can go to 0V. This provides the ability to recover a battery that has entered a safety-circuit undervoltage fault mode.
I PCHG = 50mA
successful charge completion. This taper current threshold is programmed by a single external resistor between ISET2 and ground.
1170 I EOC = -----------------------------------------R ISET2 x R SNS ( mA ) (EQ. 6)
(EQ. 1)
Where RISET2 is in k and RSNS is in . A secondary charge termination method is provided via the safety timer. The timeout period of this timer is programmable via a single external capacitor between the TIME pin and ground. To disable the charge safety timer, tie the TIME pin to ground.
When the cell voltage exceeds the pre-charge voltage threshold (VPCHG), fast charging will commence. If this threshold is not reached within the precharge timer period, a TIME-OUT-FAULT condition is asserted, and the charger is disabled.
Charge Safety Timer
An internal oscillator establishes a timing reference. The oscillation period is programmable with an external capacitor at the TIME pin, CTime, as shown in the "Typical Application" diagram on page 6. The oscillator charges the timing capacitor to 1.5V and then discharges it to 0.5V in one period, both with 10A current. The period tOSC is:
t OSC = 0.2 x 10 x C Time
6
Charge Current Sensing
Charge current is sensed with an external current sense resistor. A low-inductance, precision resistor should be used for best performance.
Input Current Sensing
Input current is sensed with an external sense resistor. A low-inductance, precision resistor should be used for accurate input current limit. An internal amplifier compares the voltage between CSIP and CSIN, and limits the current when this differential voltage exceeds the threshold voltage. The effective input current limit threshold is thus set by the value of the RICS resistor as calculated by Equation 7.
0.1 I IN ( LIM ) = ------------R ICS (A) (EQ. 7)
( Sec )
(EQ. 2)
Where CTime is in F. A 1nF capacitor provides 0.2ms oscillation period. The allowable range of CTime value is 100pF to 1F, providing a programmable charge safety-timeout range of about 1.4 minutes to almost 10 days. Total charge time, excluding any time required for precharge, is limited to a length of TIMEOUT. This can be calculated using Equation 3:
TIMEOUT = 2
22
Where RICS is in . The ISL9220, ISL9220A limits the battery charge current when the input current limit threshold is exceeded. This allows the most efficient use of AC-adapter power without overloading the adapter output. A low pass filter is suggested to eliminate the switching noise, as shown in "Typical Application" on page 6.
x T OSC
( Sec )
(EQ. 3)
Total charge time for battery precharge is limited to a length of 1/8 TIMEOUT. This can be calculated using Equation 4:
TIMEOUT ( PCHG ) = 2
19
x T OSC
( Sec )
(EQ. 4)
The TIME pin can be grounded to disable the safety timer functions if not needed.
Status Outputs
TABLE 1. STAT1 AND STAT2 TRUE TABLE STAT1 L L H H STAT2 L H L H CHARGING CONDITION Precharge, or fast charge in progress Charge Complete Fault Suspend
Fast Charge
The fast charge current is programmed by the resistor between the ISET1 pin and ground, and by the value of the RSNS resistor.
1946 I CHG = -----------------------------------------R ISET1 x R SNS ( mA ) (EQ. 5)
Where RISET1 is in k and RSNS is in . For best accuracy, select RSNS value that provides between 40mV to 80mV differential voltage across RSNS at the desired maximum peak current (DC plus ripple).
STAT1 and STAT2 are configured to indicate various charging conditions as given in Table 1. A fault status is triggered under one of these conditions: 1. VBAT > VOUT_OVP threshold 2. Timeout occurs before the EOC current has been reached
Charge Termination
Output current is continuously monitored during charge. When current falls below the taper current threshold, charging will stop, and BATFUL is asserted to indicate a 9
FN7652.1 July 2, 2010
ISL9220B
To exit the fault mode, the input power has to be removed and re-applied, or the EN pin is toggled to HI and back to LO.
V BAT V BAT * 1 - -------------- V IN I = -------------------------------------------------L * fS
(EQ. 8)
Applications Information
Power-on Reset (POR)
The ISL9220B resets itself as the input voltage rises above the POR rising threshold. The internal oscillator starts to oscillate, the internal timer is reset, and the charger begins to charge the battery. The STAT1/2 pins will indicate the operating condition according to Table 1.
Trickle Charge
If the battery voltage is below the trickle charge threshold, the ISL9220B charger delivers a small current to trickle charge the battery until the voltage reaches the fast charge threshold value. When VBAT is below VPCHG, the ISL9220B operates as a linear regulator, providing a 50mA constant current to output. When VBAT reaches VPCHG, the ISL9220B starts to operate as a switching charger and delivers the programmed fast charge current.
In Equation 8, usually the typical values can be used but to have a more conservative estimation, the inductance should consider the value with the worst case tolerance; and for switching frequency fS, the minimum fS from the "Electrical Specifications" table on page 4 can be used. A worst case for the charge current ripple is when the battery voltage is half of the input voltage. To select the inductor, its saturation current rating should be at least higher than the sum of the maximum output current and half of the delta calculated from Equation 8. Another more conservative approach is to select the inductor with the current rating higher than the peak current limit. Another consideration is the inductor DC resistance since it directly affects the efficiency of the converter. Ideally, the inductor with the lower DC resistance should be considered to achieve higher efficiency. Inductor specifications could be different from different manufacturers so please check with each manufacturer if additional information is needed. For the output capacitor, a ceramic capacitor can be used because of the low ESR values, which helps to minimize the output voltage ripple. A typical value of 10F/10V ceramic capacitor should be enough for most of the applications and the capacitor should be X5R or X7R.
Charge Cycle
A charge cycle consists of three charge modes: trickle mode, constant current (CC) mode, and constant voltage (CV) mode. The charge cycle always starts with the trickle mode until the battery voltage stays above VPCHG (2.5V typical). If the battery voltage stays below VPCHG, the charger stays in the trickle mode. The charger moves to the CC mode after the battery voltage is above VPCHG. As the battery-pack terminal voltage rises to the final charge voltage, the CV mode begins. Since the battery terminal voltage is regulated at the constant output voltage in the CV mode, the charge current is expected to decline as the cell voltage rises. After the charge current drops below the end-of-charge level, which also programmable by RISET2, the ISL9220B indicates the end-of-charge (EOC) with STAT1 and STAT2 and terminates the charge. The following events initiate a new charge cycle: * POR * A new battery being inserted (detected by RTH pin) * Recovery from an battery over-temperature fault * The EN pin is toggled from HI to LO
Board Layout Recommendations
The ISL9220B is a high frequency switching charger and hence the PCB layout is a very important design practice to ensure a satisfactory performance. The power loop is composed of the output inductor L, the output capacitor COUT, the SW pin and the PGND pin. It is important to make the power loop as small as possible and the connecting traces among them should be direct, short and wide; the same practice should be applied to the connection of the VIN pin, the input capacitor CIN and PGND. The switching node of the converter, the SW pin, and the traces connected to this node are very noisy, so keep the voltage feedback trace and other noise sensitive traces away from these noisy traces. The input capacitor should be placed as close as possible to the VIN pin. The ground of the input and output capacitors should be connected as close as possible as well. In addition, a solid ground plane is helpful for a good EMI performance. The ISL9220B employs a thermal enhanced QFN package with an exposed pad. In order to maximize the current capability, it is very important that the exposed pad under the package be properly soldered to the board
FN7652.1 July 2, 2010
Recharge
After a charge cycle completes at a timeout event, charging is prohibited until the recharge condition (VBAT < VRECHG) is met. Then the charging restarts with the timer reset to zero.
Inductor and Output Capacitor Selection
To achieve better steady state and transient response, ISL9220B typically uses a 10H inductor. The peak-to-peak inductor current ripple can be expressed in Equation 8:
10
ISL9220B
and also be connected to other layers through thermal vias. More thermal vias and more copper attached to the exposed pad usually result in better thermal performance. The exposed pad is big enough for 5 vias, as shown in Figure 4.
Charging Flow Chart
The charging flow chart is shown in Figure 5. The charging starts with trickle charge current, the ISL9220B charges the battery in 50mA. If VBAT reaches VPCHG before the trickle charge timeout interval, the operation will move to the CC mode. When the output voltage reaches the 4.2V final voltage, the operation will move to CV mode, where the battery is charged at a constant voltage. If the end-of-charge current is reached before the timeout interval is elapsed, the operation moves to charge complete state. The charging is terminated. After the termination, if the output voltage drops below the recharge threshold, a recharge starts and the timer is reset to zero. In the event that the timeout condition is reached before the EOC condition is reached, the fault mode is entered. The fault mode can also be triggered by a VBAT OVP event. To exit the fault mode, the input power has to be removed and re-applied, or the EN pin is toggled to HI and back to LO, then a new cycle starts.
FIGURE 4. FIGURE 4.
11
FN7652.1 July 2, 2010
ISL9220B
FIGURE 5. CHARGING FLOW CHART
12
FN7652.1 July 2, 2010
ISL9220B
Typical Operating Conditions
VIN = 12V CC MODE 95 VBAT = 3.6V
90 EFFICIENCY (%) VBAT = 4V VBAT = 3V 80
85
75 VIN = 5V 70 L = 10H 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 CHARGE CURRENT (A)
FIGURE 6. PWM WAVEFORM, CH1 = SW (5V/DIV); CH4 = INDUCTOR CURRENT (500mA/DIV)
FIGURE 7. EFFICIENCY vs LOAD
13
FN7652.1 July 2, 2010
ISL9220B
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE 7/1/10 REVISION FN7652.1 CHANGE Changed minimum limit for "IPCHG" on page 4 from 30 to 25mA. On page 4, changed "Minimum On-Time" with typical 20ns to "Minimum Duty Cycle" w/typical of 0% Initial release.
6/30/10
FN7652.0
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil product families. *For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on intersil.com: ISL9220B To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff FITs are available from our website at http://rel.intersil.com/reports/search.php
For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 14
FN7652.1 July 2, 2010
ISL9220B
Package Outline Drawing
L20.4x4E
20 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 4/10
4X 2.00 4.00 A B 6 PIN 1 INDEX AREA 16 16X 0.50 20 6 PIN #1 INDEX AREA 1
15
4.00
2 . 60
11
5
(4X)
0.15 10 TOP VIEW 20X 0 . 40 0.10 BOTTOM VIEW 6 0.10 M C A B 4 0.23 +0.07/- 0.05
SEE DETAIL "X" 0.10 C 0.75 BASE PLANE SEATING PLANE 0.08 C SIDE VIEW (3.8 TYP) ( 2 . 60 ) ( 16X 0 . 50 ) C
( 20X 0 . 23 ) ( 20 X 0 . 60 )
C
0 . 2 REF
5
0 . 00 MIN. 0 . 05 MAX. DETAIL "X" NOTES: 1. 2. 3. 4. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. Dimensioning and tolerancing conform to ASME Y14.5m-1994. Unless otherwise specified, tolerance : Decimal 0.05 Dimension applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. 6. Tiebar shown (if present) is a non-functional feature. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. JEDEC reference drawing: MO-229.
TYPICAL RECOMMENDED LAND PATTERN
7.
15
FN7652.1 July 2, 2010

▲Up To Search▲

Price & Availability of ISL9220B10

	To Download ISL9220B10 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .