FAN5230

REV. 2.8.5 10/17/01

3

LSD3.3

7

Low-side gate driver for 3.3V. Connect this pin directly to the gate of an

N-channel MOSFET. The trace from this pin to the MOSFET gate should be < 1".

GND3.3

8

Ground for 3.3V MOSFET.

ISEN3.3

9

Current sense for 3.3V. This pin should be connected to the Drain of the bottom

Mosfet with an appropriate resistor and an RC filter. See Application Section.

VFB3.3

10

Voltage feedback for 3.3V.

SDN3.3

11

Soft Start and ON/OFF for 3.3V. OFF=GND. ON=open with SDWN=High. Use

open collector device for control.

PGOOD

12

Power Good Flag. An open collector output that will be logic low if any output

voltage is not above 89% of the nominal output voltage.

SDWN

13

Master Shutdown. Shutdown for all power. Off when low. When high

5V/3.3V-ALWAYS are ON while 5V/3.3V-Main are ready to turn on if SDN5,

SDN3.3 go open.

SGND

14

Signal ground.

VFB12

15

Voltage feedback for 12V.

SW12

16

FET driver for 12V Boost.

SDN5

17

Enable/Soft Start for 5V and 12V. Soft start and ON/OFF for 5V & 12V.

OFF=Grounded. ON=open with SDWN=High.

VFB5

18

Voltage feedback for 5V.

GND5

19

Ground for 5V MOSFET.

LSD5

20

Low side FET driver for 5V. Connect this pin directly to the gate of an N-channel

MOSFET. The trace from this pin to the MOSFET gate should be < 1".

ISEN5

21

Current Sense for 5V. This pin should be connected to the drain of the bottom

Mosfet using appropriate resistor and RC filter. See Application Section.

SW5

22

High Side Driver Source and Low Side Driver Drain Switching Node.

Switching node for 5V.

HSD5

23

High side FET driver for 5V. Connect this pin directly to the gate of an N-channel

MOSFET. The trace from this pin to the MOSFET gate should be < 1".

CPUMP5

24

Charge Pump 5V. High side Gate drive voltage for 5V. High side Gate drive

voltage for 5V. This pin is to be connected to SW5 through a 100nF cap. and to

5V-ALWAYS through a diode.

Pin Name

Pin Number Pin Function Description