AP3422 Datasheet, PDF (2/11 Pages) BCD Semiconductor Manufacturing Limited – Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter

Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Pin Configuration
DN Package
(DFN-3×3-10)
Pin 1 Mark
EN1 ¹
FB1 ²
VIN2 ³
GND2 ⁴
SW2 ⁵
Exposed
Pad
10 _SW1
9 _GND1
8 _VIN1
7 _FB2
6 _EN2
Pin Description
Figure 2. Pin Configuration of AP3422 (Top View)
Pin Number Pin Name
Function
Channel 1 enable control input. Drive EN1 above 1.5V to turn on the
1
EN1 Channel 1. Drive EN1 below 0.6V to turn it off (shutdown current <
0.1µA)
2
FB1
Channel 1 feedback input. Connect FB1 to the center point of the external
resistor divider. The feedback voltage is 0.6V
3
VIN2
Channel 2 supply input. Bypass to GND with a 10µF or greater ceramic
capacitor
4
GND2 Ground 2
5
SW2
Channel 2 power switch output. Inductor connection to drains of the
internal PFET and NFET switches
Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the
6
EN2 Channel 2. Drive EN2 below 0.6V to turn it off (shutdown current <
0.1µA)
7
FB2
Channel 2 feedback input. Connect FB2 to the center point of the external
resistor divider. The feedback voltage is 0.6V
8
VIN1
Channel 1 supply input. Bypass to GND with a 10µF or greater ceramic
capacitor
9
GND1 Ground 1
10
SW1
Channel 1 power switch output. Inductor connection to drains of the
internal PFET and NFET switches
Sep. 2011 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2