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FP9928A-0.1-OCT-2013

FP9928A

fitipower integrated technology lnc.

Functional Pin Description

Pin Name

Pin No.

Pin Function

FBGH

1

Voltage Feedback to Determine Positive Charge Pump Output Voltage.

FBGH is regulated to 1.25V.

VPOS_IN

2

Input pin for LDO (VPOS).

VPOS

3

Positive Source Driver Power.

EN

4

Enable Pin of Whole CHIP

TP

5

Test pin for testing, please do not connect to any signal.

TS

6

Thermistor input pin.

Connect a 10K NTC thermistor and a 43K linearization resistor between this pin and

system GND.

VREF

7

Internal Reference Bypass Terminal.

SDA

8

Serial interface (I

SCL

9

Serial interface (I

VIN

10

Power Supply Input.

The supply voltage powers all the control circuits.

ENOP

11

Enable Pin of Unity-Gain Operational Amplifier, active when EN is high.

OPIN

12

Unity-Gain Operational Amplifier Input Pin.

VSSOP

13

Positive Supply of Unity-Gain Operational Amplifier.

OPOUT

14

Unity-Gain Operational Amplifier Output Pin.

VNEG

15

Negative Source Driver Power, also ground of op-amp.

VNEG_IN

16

Input pin for LDO (VNEG).

FBGL

17

Voltage Feedback to Determine Negative Charge Pump Output Voltage.

FBGL is regulated to 0V.

DRVN

18

Switching Pin.

Driver for the negative charge pump.

VS

19

Regulated voltage for internal circuit.

LXN

20

Switching Pin.

Drain of the internal power NMOS for the inverting regulator.

VSSP2

21

Power Ground.

VSSP2 is the source of positive or Inverting boost converter power NMOS.

VSSP1

22

Power Ground.

VSSP1 is the source of positive or Inverting boost converter power NMOS.

LXP

23

Switching Pin.

Drain of the internal power NMOS for the positive regulator.

DRVP

24

Switching Pin.

Driver for the positive charge pump.

VSS

25

Chip Digital Ground Pin must be connected to System GND.