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