General Description

The APS2415 is a high efficiency monolithic

synchronous buck regulator using a constant frequency,

current mode architecture. The device is available in an

adjustable version and fixed output voltages, such as

1.2V, 1.5V, 1.8V, etc. Supply current with no load is

300uA and drops to <1uA in shutdown. The 2.5V to

6.5V input voltage range makes the APS2415 ideally

suited for single Li-Ion, two to four AA battery-powered

applications. 100 duty cycle provides low dropout

operation, extending battery life in portable systems.

PWM pulse skipping mode operation provides very low

output ripple voltage for noise sensitive applications.

Switching frequency is internally set at 1.2MHz,

allowing the use of small surface mount inductors and

capacitors. The internal synchronous switch increases

efficiency and eliminates the need for an external

Schottky diode. Low output voltages are easily

supported with the 0.6V feedback reference voltage. The

APS2415 is available in a small SOT package.

Applications

Cellular and Smart Phones

Microprocessors and DSP Core Supplies

Wireless and DSL Modems

PDAs

MP3 / MP4 /PMP Player

Digital Still and Video Cameras

Portable Instruments

Features

High Efficiency: Up to 96

1.2MHz Constant Switching Frequency

1.5A Output Current at VIN=3V

Integrated Main switch and synchronous rectifier.

No Schottky Diode Required

2.5V to 6.5V Input Voltage Range

Output Voltage as Low as 0.6V

100 Duty Cycle in Dropout

Quiescent Current: 300μA(input < 4.2V)

Slope Compensated Current Mode Control for

Excellent Line and Load Transient Response

Short Circuit Protection

<1uA Shutdown Current

Soft start

Space Saving 5-Pin SOT23 package