AX5103A

AX5103A Step-up PWM DC/DC Converter ™ GENERAL DESCRIPTION The AX5103A 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 AX5103A can be operated at switching frequencies of 500kHz 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: 3.6V to 23V Output voltage: 4.0 V to 58V (±2.5%) Duty ratio: 0% to 80% PWM control Switch current: 3A(MAX) Oscillation frequency: 500KHz. Soft-start function Thermal Shutdown function Built-in internal SW N-channel MOS SOP-8L Pb-Free Package. ™ BLOCK DIAGRAM Vcc Phase Compensation + + Vref PWM Controller Thermal Shutdown Buffer Driver FB SW Oscillator Vss SGND 1/8 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Aug.09, 2010 cˆgCNãtUFÿmñW3^VÛmw`RyÑb€g–PQlSø u5‹Ýÿ 0755-8398 3377 135 9011 2223 http://www.gofotech.com AX5103A ™ PIN ASSIGNMENT The package of AX5103A is SOP-8L; the pin assignment is given by: ( Top View ) SGND VCC VCC FB 1 AX5103A 2 3 4 SOP-8L 8 7 6 5 Vss Vss SW SW Name De...