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AP3428：Buck Converter

Description

The AP3428/A is a 1A 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 AP3428/A supports a range of input voltages from 2.5V 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 AP3428/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 AP3428/A delivers 1A maximum output current while consuming only 40μA of no-load quiescent current. Ultra-low R_DS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3428/A an ideal choice for high output voltage, high current applications which require a low dropout threshold.

The AP3428/A is available in TSOT25, U-DFN2020-6 packages.

Application

• Notebook PCs
• TVs
• Set-top-boxes
• Networking Equipments

Features

• Output Current: Up to 1A
• Output Voltage: 0.6V to VIN
• Input Voltage: 2.5V to 5.5V
• 0.6V Reference Voltage With ±2% Precision
• 40μA (Typ) No Load Quiescent Current
• Shutdown Current: <1μA
• 100% Duty Cycle Operation
• 1.5MHz Switching Frequency
• Internal Soft Start
• No External Compensation Required
• Current Limit Protection
• Thermal Shutdown
• TSOT25, U-DFN2020-6 Packages

Ordering Information

• AP3428AKTTR-G1
• AP3428DNTR-G1
• AP3428KTTR-G1

TSOT25

U-DFN2020-6