Copyright

© ANPEC Electronics Corp.

Rev. A.6 - May, 2013

APW8819

www.anpec.com.tw

13

Pin Description

NO.

QFN-20 TQFN-16

NAME

FUNCTION

1

-

VTTSNS

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

capacitor.

2

2

VLDOIN

Supply voltage input for the VTT LDO.

3

3

VTT

Power output for the VTT LDO.

4

-

VTTGND

Power ground output for the VTT LDO.

5

4

VTTREF

VTTREF buffered reference output.

6

5

VREF

1.8V Reference Output. A recommended capacitor with a value of 0.1uF should be attached

to the VREF terminal.

7

Thermal

Pad

GND

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

LDO output capacitor.

8

6

REFIN

Reference input for VDDQ. Programmed by the resistor-divider connected between VREF

and GND.

9

7

VDDQSNS

VDDQ reference input for VTT and VTTREF. Power supply for 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.

10

-

PGND

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

low-side MOSFET. Also it is current sense comparator positive input terminal and the

ground of power good circuit.

11

8

LGATE

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

MOSFET. Swings from PGND to VCC.

12

9

VCC

Filtered 5V power supply input for internal control circuitry.

13

10

PHASE

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.

14

11

UGATE

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

MOSFET.

15

12

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.

16

13

S5

S5 signal input.

17

14

S3

S3 signal input.

18

15

OC

19

16

MODE

Discharge mode and switching frequency setting pin.

20

1

POK

Power-okay output pin. POK is an open drain output used to Indicate the status of the output

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