UD05201

Advance

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 5

www.unisonic.com.tw

QW-R115-003.a

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FUNCTION DESCRIPTIONS

Operation

UTC UD05201A/B/C is a monolithic switching mode Step-Down DC-DC converter. It utilizes internal MOSFETs to

achieve high efficiency and can generate very low output voltage by using internal reference at 0.6V. It operates at a

fixed switching frequency, and uses the slope compensated current mode architecture. This Step-Down DC-DC

Converter supplies 2000mA output current at input voltage range from 2.6V to 5.5V.

Current Mode PWM Control

Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for

excellent load and line responses and protection of the internal main switch (P-CH MOSFET) and synchronous

rectifier (N-CH MOSFET). During normal operation, the internal P-CH MOSFET is turned on for a certain time to

ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor

switch is off, the synchronous rectifier will be turned on immediately and stay on until either the inductor current

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TYPICAL APPLICATION CIRCUIT

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.