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
μ
A. 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 48
μ
A 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.
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Key Features
Output Current: Up to 2A
Output Voltage: 0.6V to Vin
Input Voltage: 2.7V to 5.5V
Shutdown Current: <1
μ
A
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