www.fairchildsemi.com
FAN5307
High-Efficiency Step-Down DC-DC Converter
Features
• • • • • • • • • • • • • • 95% Efficien...
www.fairchildsemi.com
FAN5307
High-Efficiency Step-Down DC-DC Converter
Features
95% Efficiency, Synchronous Operation Adjustable Output
Voltage Option from 0.7V to VIN 2.5V to 5.5V Input
Voltage Range Customized Fixed Output
Voltage Options Up to 300mA Output Current Fixed Frequency 1MHz PWM Operation High Efficiency Power Save Mode 100% Duty Cycle Low Dropout Operation Soft Start Dynamic Output
Voltage Positioning 15µA Quiescent Current Excellent Load Transient Response 5-Lead SOT-23 Package 6-Lead MLP 3x3mm Package
Description
The FAN5307, a high efficiency low noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter is designed for battery-powered applications. It provides up to 300mA of output current over a wide input range from 2.5V to 5.5V. The output
voltage can be either internally fixed or externally adjustable over a wide range of 0.7V to 5.5V by an external
voltage divider. Custom output
voltages are also available. At moderate and light loads pulse skipping modulation is used. Dynamic
voltage positioning is applied, and the output
voltage is shifted 0.8% above nominal value for increased headroom during load transients. At higher loads the system automatically switches to current mode PWM control, operating at 1 MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. In Power Save mode, the quiescent current is reduced to 15µA in order to achieve high efficiency ...