AX5302

AX5302 PWM Step-up Controller  GENERAL DESCRIPTION The AX5302 is high efficient PWM step-up controller. Designed to drive an external N-channel MOSFET, 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. The AX5302 can be operated at switching frequencies of 500kHz allowing for easy filtering and low noise, the size of the external components can be reduced. An enable function and thermal shutdown functions are built inside. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup.  FEATURES Input voltage: 3.0V to 24V Output voltage: Define by N-channel MOS Duty ratio: 0% to 85% PWM control Oscillation frequency: 500KHz (±20%) Soft-start time is programmed by outside capacitor Current Limit is setting by outside resistance Thermal shutdown protection Enable/shutdown function External SW N-channel MOS. SOP-8L Pb-Free Package.  BLOCK DIAGRAM Vcc Phase Compensation + Vref=1.0V PWM Controller EN VEN 8uA Thermal Shutdown FB Regulator + Buffer Driver GATE Oscillator GND 0.06V SS SENSE 1/8 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Aug.24, 2010 AX5302  PIN ASSIGNMENT This package of AX5302 is SOP-8L; the pin assignment is given by: Name Description Shutdown Control Input. ( Top View ) H：normal operation EN L：Shutdown mode EN 1 8 NC FB Feedback pin Vcc 2 7 GN...