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1-1-2 Switching Mode Regulator ICs
SPI-8000A Series
Features
* Surface-mount 16 pin package * Output current: 3.0A
Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs
Absolute Maximum Ratings
Parameter DC Input Voltage Power Dissipation Junction Temperature Storage Temperature Thermal Resistance (junction to case) Thermal Resistance (junction to ambient air) Symbol VIN PD*1, *2 Tj Tstg Ratings 53 2.4 +125 -40 to +125 18 50 Unit V W C C C/W C/W (Ta=25C)
* High efficiency: 91% (at VIN = 10V, lO = 1A, VO = 5V) * Capable of downsizing a choke-coil due to IC's high switching frequency (125kHz). (Compared with conventional Sanken devices) * The output-voltage-variable type can vary its output voltage from 1V to 14V because of its low reference voltage (Vref) of 1V. * Wide Input Voltage Range (8 to 50V) * Output ON/OFF available * Built-in overcurrent and thermal protection circuits
j-c*2 j-a*2
*1: Limited due to thermal protection. *2: When mounted on glass-epoxy board 700cm2 (copper laminate area 30.8cm2).
Applications
* Onboard local power supplies * OA equipment * For stabilization of the secondary-side output voltage of switching power supplies
Recommended Operating Conditions
Ratings Parameter DC Input Voltage Range Output Voltage Range Output Current Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN VO IO Tjop Top SPI-8010A (8 or Vo+3)*1 to 50 1 to 14 0.02 to 3.0 -30 to +125 -30 to +125
*1: The minimum value of an input voltage range is the higher of either 8V or VO+3V.
Electrical Characteristics
Rating Parameter Symbol min. Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Reference Voltage Overcurrent Protection Starting Current Quiescent Circuit Current Circuit Current at Output OFF CE/SS Terminal Low Level Voltage Outflow Current at Low Voltage VADJ Conditions Eff Conditions FOSC Conditions VOLINE Conditions VOLOAD Conditions VADJ/Ta IS Conditions Iq Conditions Iq(off) Conditions VSSL ISSL Conditions VSSL=0V VIN=12V, VON/OFF=0.3V 0.5 50 3.1 VIN=12V 7 VIN=12V, IO=0A 400 0.97 SPI-8010A (Variable type) typ. 1.00 VIN=12V, IO=1A 86 VIN=20V, IO=1A, VO=5V 250 VIN=12V, IO=1A 20 VIN=10 to 30V, IO=1A 10 VIN=12V, IO=0.1 to 1.5A 0.5 30 40 max. 1.03
(Ta=25C) Unit
V % kHZ mV mV mV/C A mA
A
V
A
* Pin 4 is the CE/SS pin. Soft start at power on can be performed with a capacitor connected to this pin. The output can also be turned ON/OFF with this pin. The output is stopped by setting the voltage of this pin to VSSL or lower. CE/SS-pin voltage can be changed with an opencollector drive circuit of a transistor. When using both the soft-start and ON/OFF functions together, the discharge current from C4 flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The CE/SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
SPI-8000A
SPI-8000A
SPI-8000A
4 CE/SS
4 CE/SS C4
4 CE/SS C4
VO. ON/OFF
Soft start
Soft start +VO. ON/OFF
52
ICs
SPI-8000A Series
External Dimensions (HSOP16)
1+0.1/-0.05 (Heatsink thickness) 10.50.2 16 9
(Unit : mm)
a
2.0+0.2/-0.08
8010A b c
SK
2.75MAX
2.50.2
1
8
0.25+0.15/-0.05
10.50.3
S 12.20.2
(Gate remains: Not included in dimensions)
0.10
S
(11)
1
8
Pin Assignment 1.AGND 2.N.C 3.DGND 4.CE/SS 5.Reg 6.N.C 7.SWOUT 8.N.C 9.N.C 10.N.C 11.VIN 12.B.S 13.N.C 14.Comp 15.VREF 16.N.C Product Mass : Approx 0.86g
(2)
16
(4.5)
9
1.270.25
0.4+0.15/-0.05
Block Diagram
SPI-8010A
VIN
UVLO CE/SS CE/SS
P.REG
OCP BS
Boot REG TSD
7.50.2
DRIVE Reg OSC
+ -
PWM LOGIC
SWOUT
VREF Comp
Amp +
1V
GND
ICs
53
1-1-2 Switching Mode Regulator ICs
Typical Connection Diagram
SPI-8010A
12
B.S
11
R1 L1 C3
VIN
4 C1
VIN CE/SS
C7
SPI-8010A
SWOUT
7 D1 R2 C9
V0
+
Reg Comp AGND
5 C4 C5 14 C6 1
DGND VREF
3
+
C2 C8
15 R3 IREF
GND
GND
C1: 220F/63V C2: 470F/25V C3: 0.1F C4: 1000pF C5: 0.1F C6: 0.047F C7: 0.1F C8: 0.1F C9: 6800pF R1: 47 L1: 47H D1: SPB-G56S (Sanken)
Diode D1 * Be sure to use a Schottky-barrier diode for D1. If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage generated by the recovery voltage or ON voltage. Choke coil L1 * If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value. * As the overcurrent protection starting current is about 4.5A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to overload or short-circuited load. Capacitors C1, C2 * As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use. Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures. For C2, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may cause an abnormal oscillation. Resistors R2, R3 * R2 and R3 are the resistors to set the output voltage. Set their values so that IREF becomes approx. 2mA. Obtain R2 and R3 values by the following formula: R2= (VOUT-VREF) (VOUT-1) 1 VREF . 500() = = = (), R3 = . IREF 2x10-3 IREF 2x10-3
To create the optimum operating conditions, place the components as close as possible to each other.
Ta-PD Characteristics
3.00
PD=VO * IO
Power Dissipation PD (W)
2.50
j-a:41.7C/W(30.8cm )
2
100 VO -1 -VF * IO 1- VIN
j-a:47.6C/W(8.64cm2)
2.00
j-a:62.5C/W(0.84cm2)
1.50
Note 1: The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. Note 2: Thermal design for D1 must be considered separately. VO : Output voltage VIN : Input voltage IO : Output current : Efficiency (%) VF : Diode D1 forward voltage SPB-G56S***0.4V(IO=2A)
1.00
0.50
0 -30
0
25
50
75
100
125
Ambient Temperature Ta (C)
54
ICs

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