Copyright

© ANPEC Electronics Corp.

Rev. A.6 - Sep., 2012

APW8813/A

www.anpec.com.tw

8

Pin Description

PIN

APW8813 APW8813A

NAME

FUNCTION

1

1

VTTGND

Power ground output for the VTT LDO.

2

2

VTTSNS

Voltage sense input for the V TT LDO. Connect to plus terminal of the VTT LDO output

capacitor.

3

3

GND

Signal ground for the PWM control ler and VTT LDO. Connect to minus terminal of the VTT

LDO output capacitor.

4

-

MODE

Discharge mode setting pin. When this pin connects to VCC, it is no discharge state. When

this pin connects to VDDQ, it is tracking discharge state. When this pin connects to GND, it is

non-tracking discharge state.

5

4

VTTREF

VTTREF buffered reference ou tput.

6

-

FCCM

Selection pin for PWM controller to operate in either forced PWM or automatic PWM/PFM

mode. Force PWM mode is enabl e when FCCM pin is pulled below the falling threshold

7

-

NC

No Connection.

8

5

V DDQSNS

VDDQ reference input for VTT and VTTREF. Power supply fo r the VTTREF. Discharge

current sinking terminal for VDDQ non-tracking discharge. Output voltage feedback input for

VDDQ output if VDDQSET pin is connected to VCC or GND.

9

6

VDDQSET

VDDQ output voltage setting pin.

10

7

S3

S3 signal input.

11

8

S5

S5 signal input.

12

9

TON

pin to PHASE VIN terminal.

13

10

PGOOD

Power-good output pin. PGOOD i s an open drain output used to Indicate the status of the

output voltage. When VDDQ output voltage is within the ta rget range, it is in high state.

14

11

VCC

Filtered 5V power supply input for internal control circuitry. Connect R-C network from PVCC

to VCC.

15

12

PVCC

5V power supply voltage input pin for low-side MOSFET gate driver on TQFN-24 package.

16

13

CS

through the voltage setting resistor.

17

-

CS_GND

Current sense comparator posi tive input terminal and the ground for power good circuit.

18

14

PGND

Power ground of the LGATE low-side MOSFET driver. Connect the pin to the Source of the

low-side MOS FET. Also i t is current sense comparator positive input terminal and the ground

of power good circuit on SSOP-20 package.

19

15

LGATE

Output of the low-side MOSFET driver for PWM. C onnect this pin to Gate of the low-side

MOSFET. Swings from PGND to VCC.

20

16

P HASE

Junction point of the high-side MOSFET Source, output filter inductor and the low-side

MOSFET Drain. Connect this pin to the Source of the high-side MOSFET. PHASE serves as

the lower supply rail for the UGATE high-side gate driver.

21

17

UGATE

Output of the high-side MOSFE T driver for PWM. Connect this pin to Gate of the high-side

MOSFET.

22

18

BOOT

Supply Input for the UGATE Gate Driver and an internal level-shift circuit. Connect to an

external capacitor and diode to create a boosted voltage suitable to drive a logic-level

N-channel MOSFET.

23

19

LDOIN

Supply voltage input for the VTT LDO.

24

20

VTT

Power output for the VTT LDO.