UD06122

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 10

www.unisonic.com.tw

QW-R115-013 .A



FUNCTION DESCRIPTIONS

Operation

UTC UD06122 is a dual channel, 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 1.2A output current by each channel with input voltage range from 2.5V to

6.0V.

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

,

limits the peak inductor current. When the main

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

starts to reverse, beginning of the next clock cycle.