AX5203

AX5203 Step-up PWM DC/DC Converter  GENERAL DESCRIPTION The AX5203 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 AX5203 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. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup. Build inside Current limit, Thermal Shutdown and enable functions.  FEATURES Input voltage：4.5V to 23V Output voltage：5 V to 68V Duty ratio：0% to 85% PWM control Oscillation frequency：500KHz. Enable and Thermal Shutdown function. Internal Current limit. Built-in N-channel MOSFETÑb€ `RyPb-Free package. SOP-8L with Exposed wpad m VÛm  BLOCK DIAGRAM ww FB + o w.g fo o c . h tec Vcc Phase Compensation + Regulator SW Vref=1.0V Buffer Driver PWM Controller EN VEN 8uA Thermal Shutdown Oscillator 0.06V SGND PGND SS 1/8 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.3 Jan.25, 2011 AX5203  PIN ASSIGNMET The package of AX5203 is SOP-8L-EP; the pin assignment is given by: Name ( Top View ) EN VCC FB SS 1 2 3 4 SOP-8L-EP (EP is connect to SW) Exposed pad 8 7 6 5 SGND PGND SW SW Descri...