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S1F71200 Series
4–44 EPSON S1F70000 Series
Technical Manual
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin name
VDD1
VDD2
EXO
VO
SRC
IREF
VREF
(N.C)
POFFX
VC
SWC
VSW
VSS
SSC
ISENSE
SWO
Pin type
Power supply
Power supply
Output
—
—
Output
Output
—
Input
Input
—
—
—
—
Input
Output
Power system
VDD1
VDD2
VDD2
—
—
VDD1
VDD1
—
VDD1
VDD1
—
—
—
VDD1
VDD1
VDD1
Description
Power pin 1 (+), Input power pin
Power pin 2 (+), Power pin for series regulator
circuit
PNP transistor base drive pin for series regulator
Step-up/step-down output feedback pin
Series regulator phase compensation capaci-
tor connection pin
Reference resistor connection pin. Connect a
100kΩ resistor between the V
SS pins.
Reference voltage pin. Connect a 0.1µF
capacitance between the V
SS pins.
No connection
Power off control pin.
During normal operation : POFFX = V
DD1
At power off time : POFFX = VSS
Step-up output voltage setting pin.
For setting V
SW = VO + 1.0V : VC = VDD1
For setting VSW = VO + 0.5V : VC = VSS
Switching regulator phase compensation
capacitor connection pin
Step-up output feedback pin
Power pin (–), Ground pin
Capacitor connection pin for soft start
Overcurrent detection pin
Step-up switching power transistor drive pin