NMOSFET
AF2039
Features
l Min1.6V Startup @1mA Load l 600mV Feedback Voltage l 550KHz Internal Oscillator l Soft Startup: 10mS T...
Description
AF2039
Features
l Min1.6V Startup @1mA Load l 600mV Feedback Voltage l 550KHz Internal Oscillator l Soft Startup: 10mS Typical l Peak Current Programmable by Bottom Sensing Resistor l 300µA Typical Iq l Internal PWM/PFM Auto Mode Switching l Up to 90% Efficiency l External Enable l Power OFF Current<1µA l Over Voltage Protection l 140℃ Thermal Shut Down, 20℃ Hysteresis
Applications
l USB Charger
General Description
The AF2039 using the external NMOSFET. It is a high efficiency boost converter with 600mV feedback voltage. A switching frequency of 550KHz minimizes solution footprint by allowing the use of tiny low profile inductors and ceramic capacitors. The current mode PWM/PFM design is internally compensated, and the device has a 1.6V startup voltage with 1mA load. It needs few external components, only inductance, resistance and capacitance can meet the driving capacity.
Block Diagram
AF-V1.0
www.afsemi.com
1/5
Analog Future
Pin Assignment
Pin 1 2 3 4 5
Symbol FB VDD CE ...
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