General Description
The RT5771A is a high efficiency synchronous, step-down
DC-DC converter. Its input voltage ranges from 2.7V to
5.5V that provides an adjustable regulated output voltage
from 0.6V to VIN while delivering up to 3A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The switching frequency is
fixed internally at 1MHz. The 100% duty cycle provides
low dropout operation, hence extending battery life in
portable systems. Current mode operation with internal
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
The RT5771A is available in a WDFN-10L 3x3 package.

Applications
 Portable Instruments
 Battery Powered Equipment
 Notebook Computers
 Distributed Power Systems
 IP Phones
 Digital Cameras

Features
 High Efficiency : Up to 95%
 Low RDS(ON) Power Switches : 69mΩ/49mΩ
 Current Mode Operation
 Forced-PWM (FPWM) Mode
 Fast Transient Response
 Fixed Frequency : 1MHz
 No Schottky Diode Required
 Internal Compensation
 0.6V Reference Allows Low Output Voltage
 Low Dropout Operation : 100% Duty Cycle
 OCP, UVP, OTP
 OpenVReg Type 0-LV Compliant