Copyright

© ANPEC Electronics Corp.

Rev. A.3 - Sep., 2013

APW8713

www.anpec.com.tw

10

Pin Description

PIN

NO.

NAME

FUNCTION

1

POK

Power-Good Output Pin of PWM. POK is an open-drain output used to indicate the status of the PWM

output voltage. Connect the POK in to +5V through a pull-high resistor.

2

EN

PWM Enable. PWM is enabled when EN=1. When EN=0, PWM is in shutdown.

3

PFM

PFM Selection Input. When the PFM is above high logic level, the Device is in force PWM mode. When the

PFM is below low logic level, the device is in automatic PFM/PWM Mode.

4

AGND

Signal Ground for The IC.

5

FB

Output Voltage Feedback Pin. This pin is connected to the resistive divider that set the desired output

voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage status.

6

TON

7

NC

No connect.

8, 9, 22

VIN

Battery Voltage Input Pin. VIN powers linear regulators and is also used for the constant on-time PWM

on-time one-shot circuits. Connect VIN to the battery input and bypass with a 1

µF capacitor for noise

interference.

10, 11,

16~18

LX

Junction Point of The High-Side MOSFET Source, Output Filter Inductor and The Low-Side MOSFET Drain

for PWM. Connect this pin to the Source of the high-side MOSFET. LX serves as the lower supply rail for the

UGATE high-side gate driver. LX is the current-sense input for the PWM.

12~15,

19

PGND

Power Ground of The LGATE Low-Side MOSFET Drivers.

20

BOOT

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

to create a boosted voltage suitable to drive a logic-level N-channel MOSFET.

21

VCC

Supply Voltage Input Pin for Control Circuitry, Connect +5V from the VCC pin to the GND pin. Decoupling at

least 1

µF of a MLCC capacitor from the VCC pin to the AGND pin.

23

SS

Soft Start Output. Connect a capacitor to GND to set the soft start interval.