AX5101A

AX5101A Step-up PWM DC/DC Converter ™ GENERAL DESCRIPTION The AX5101A is high efficient step-up DC/DC converter. Large output current is possible having a built in internal N channel MOSFET, and using an external coil and diode. The AX5101A can be operated at switching frequencies of 500 kHz allowing for easy filtering and low noise, the size of the external components can be reduced. Output voltage is programmable with 1.0V of standard voltage supply internal, and using externally connected components, output voltage (FB) can be set up at will. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents inrush-current at startup. The thermal shutdown function is built inside. ™ FEATURES Input voltage: 3V to 14V Output voltage: 3.3V to 28V(±2.5%） Duty ratio: 0% to 80% PWM control Switch current: 3A(MAX) Oscillation frequency: 500 KHz. Soft-start function Thermal Shutdown function Built-in internal SW N-channel MOS SOP-8L Pb-Free Package. 1/8 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Dec.04, 2007 AX5101A ™ Block Diagram Vcc Phase Compensation + Vref PWM Controller Thermal Shutdown FB SW + Oscillator Vss Buffer Driver SGND ™ PIN ASSIGNMENT The package of AX5101A is SOP-8L; the pin assignment is given by: ( Top View ) SGND VCC VCC FB 1 2 3 4 SOP-8L AX5101A 8 7 6 5 Vss Vss SW SW Name SGND VCC FB SW VSS Description Signal ground pin. IC power supply pin Feedback pin Switch pin. Co...