GENERAL DESCRIPTION
The PW2057 is a c***tant frequency, current mode step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 200μA with no load, and drops to <1μA in shutdown.
FEATURES
- High Efficiency: Up to 95%
- 1.0MHz Frequency Operation
- 2.2V to 5.5V Input Voltage Range
- Current Mode Operation for Excellent Line and Load Transient Resp***e
- Low Quiescent Current: 200μA
- Output Voltage: 0.6V ～ 5.5V
- Automatic PWM/PFM Mode Switching
- No Schottky Diode Required
- Short-Circuit Protection
- Shutdown Quiescent Current: < 1μA
- Low Profile SOT-23-5L Package (lead-free)
APPLICATI***
- Digital cameras and MP3
- Palmtop computers / PDAs
- Cellular phones
- PC ca***
- Portable media players
