Data Sheet

1.2A, 1.4MHz, Dual Synchronous DC-DC Buck Converter

AP3423

Oct. 2011 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

2

Pin Configuration

DN Package

(DFN-3×3-12)

Figure 2. Pin Configuration of AP3423 (Top View)

Pin Description

Pin

Number

Pin Name

Description

1

VIN2

Power input supply of channel 2. Decouple this pin to GND with a

capacitor

2

SW2

Internal power switch output of channel 2. Connect this pin with one

terminal of the inductor

3, 9

GND

4

FB1

Feedback voltage of channel 1. This pin is the inverting input of internal

error amplifier. It senses the converter output voltage through an external

resistor divider. The internal reference voltage is 0.6V, which determines

the output voltage through the resistor divider

5, 11

NC

No connection

6

EN1

Chip enable of channel 1 (Active high)

7

VIN1

Power input supply of channel 1. Decouple this pin to GND with a

capacitor

8

SW1

Internal power switch output of channel 1. Connect this pin with one

terminal of the inductor

10

FB2

Feedback voltage of channel 2. This pin is the inverting input of internal

error amplifier. It senses the converter output voltage through an external

resistor divider. The internal reference voltage is 0.6V, which determines

the output voltage through the resistor divider

12

EN2

Chip enable of channel 2 (Active high)