400mA Synchronous PWM/PSM Step-Down
2.5V to 5.5V Input Voltage Range
400mA Guaranteed Output Current
Up to 95% Efficiency
Low RDS(ON) Internal Switche: 280mΩ
No Schottky Diode Required
100% Duty Cycle in Low Dropout Operation
Operating Frequency: 1.5MHz
Accurate Reference 0.6V Provides Low
CPU I/O Supplies
PDAs and Handy-Terminals
Battery-Operated Devices (1 Li-Ion or 3
The AIC2350 is a low-noise, pulse-width-
modulated (PWM), DC-DC step-down converter.
The device is available in an adjustable version
and fixed output voltages of 1.0V, 1.2V, 1.8V,
The device features an internal synchronous
rectifier for high efficiency; it requires no external
Schottky diode. The AIC2350 is ideally suited for
Li-Ion battery applications. PWM/PSM mode
extends battery life by switching to a pulse-
skipping-modulated mode during light loads.
Shutdown mode places the device in standby,
reducing supply current to under 1µA.
Other features of the AIC2350 include high
efficiency, low dropout voltage, short circuit
protection, over temperature protection, and
over voltage protection. It is available in a small
5 pins SOT-23 package.
Fig. 1 Fixed Step-Down DC/DC Converter
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.