Diodes AP3429A, AP3429 User Manual

AP3429

EVB User Guide

This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without
notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

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www.diodes.com

September 2018

© Diodes Incorporated

AP3429 EV Board User Guide

1. AP3429 General Description

The AP3429/AP3429A is a 2A step-down DC-DC converter. At heavy load, the
constant-frequency PWM control performs excellent stability and transient response. No external
compensation components are required.
The AP3429/AP3429A supports a range of input voltages from 2.7V to 5.5V, allowing the use of
a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The
output voltage is adjustable from 0.6V to the input voltage. The AP3429/AP3429A employs internal
power switch and synchronous rectifier to minimize external part count and realize high efficiency.
During shutdown, the input is disconnected from the output and the shutdown current is less than 1
μA. Other key features include over-temperature and short circuit protection, and under-voltage
lockout to prevent deep battery discharge.
The AP3429/AP3429A delivers 2A maximum output current while consuming only 48μA of
no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation
make the AP3429/AP3429A an ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The AP3429/AP3429A is available in SOT23-5 packages.

2． Key Features

 Output Current: Up to 2A
 Output Voltage: 0.6V to Vin
 Input Voltage: 2.7V to 5.5V
 Shutdown Current: <1μA
 100% Duty Cycle Operation
 1MHz Switching Frequency
 Internal Soft Start
 No external Compensation Required

 Short Circuit Protection
 AP3429: Latch Off Protection
 AP3429A: Hiccup Mode Protection
 Over –voltage Protection
 AP3429 :Latch Off Protection
 AP3429A :No Latch Off Protection
 Thermal Shutdown
 SOT23-5 Packages

AP3429

EVB User Guide

This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

2 of 4

www.diodes.com

September 2018

© Diodes Incorporated

3． EV Board Schematic

4． EVB AP3429 Description

AP3429 EVB is suitable evaluation board for the AP3429/A, a DC/DC converter. The board is
targeted to be used in providing a simple and convenient evaluation environment for the AP3429/A.
Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated.

R1

R2

VIN

EN

SW

FB

L1

CIN

VIN

GND

Cout

V

OUT

ON OFF

AP3429A

CF