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 0.8V_IN by an external voltage divider. Custom output voltages are also available. Contact a Fairchild sales representative for customized output voltage options.

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 to achieve high efficiency and ensure long battery life. In shutdown mode, the supply current drops below 1µA.

The device is available in 5-lead SOT-23 and 6-lead MLP 3x3mm packages.

• 95% Efficiency, Synchronous Operation
• Adjustable Output Voltage Option: 0.7V to 0.8V_IN
• 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

• Pocket PCs, PDAs
• Cell Phones
• Battery-Powered Portable Devices
• Digital Cameras
• Low Power DSP Supplies