FAN5609
Description
The FAN5609 generates regulated output current from a battery with input voltage varying between 2.7V to 5.5V. Switch reconfiguration and fractional switching techniques are utilized to achieve high efficiency over the entire input voltage range.
Key Features
- Parallel LED Driver Supports All Forward Voltages Adaptive VOUT Adjustment to the Highest Diode Voltage Internally Matched LED Current Sources No External Components Needed to Set LED Current Built-in Charge Pump has Three Modes of Operation: - Linear Regulation VIN > 4.2V - 3/2 DC-DC Converter and Regulation 3.6V<VIN<4.2V - 2/1 DC-DC Converter and Regulation 2.7V<VIN<3.6V Up to 86% Efficiency Low EMI, Low Ripple Up to 80mA Output Current (4 × 20mA) Built-in DAC for Digital or PWM Brightness Control Can be Duty Cycle Modulated between 0 to 18mA 2.7V to 5.5V Input Voltage Range ICC < 2µA in Shutdown Mode 1MHz Operating Frequency Shutdown Isolates Output from Input Soft-Start Limits Inrush Current Short Circuit Protection Minimal External Components Needed Available in a 14-lead TSSOP Package Available in a 16-lead MLP Package
