Description

The AP3429/A 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/A 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/A

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 1μA. Other key features include over-temperature and short

circuit protection, and under-voltage lockout to prevent deep battery

discharge.

The AP3429/A delivers 2A maximum output current while consuming

only 90μA of no-load quiescent current. Ultra-low RDS(ON) integrated

MOSFETs and 100% duty cycle operation make the AP3429/A an

ideal choice for high output voltage, high current applications which

require a low dropout threshold.

The AP3429/A is available in TSOT25 package.

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

 TSOT25 package

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Applications

 5V or 3.3V Point of Load Conversion

 Telecom/Networking Equipment

 Set Top Boxes

 Storage Equipment

 Video Cards

 DDR Power Supply