UNISONIC TECHNOLOGIES CO., LTD

UC4601

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 4

Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R502-494.c

PWM STEP-DOWN DC-DC

CONTROLLER

DESCRIPTION

The UTC UC4601 is a PWM step-down DC/DC controller. It has

a low supply current. The step-down DC/DC converter with low

ripple, high efficiency performance is conveniently configured with

additional external components, such as a power-transistor, an

inductor, a diode and capacitors. The output voltage can be adjusted

with external components.

The UTC UC4601 contains a high precision band-gap voltage

reference, a PWM control circuit, a soft-start circuit, a protection

circuit, an oscillator, an error amplifier with built-in compensation

network and input/output voltage detection circuits.

The UTC UC4601 based DC/DC converter can performance well

when maintaining stability, which is due to its built-in state-of-art

control algorithm. Further, if the term of maximum duty cycle retains

on a certain time, the embedded protection circuits restart the

operation with soft-start and repeat until the maximum duty cycle

condition is released. Finally, the internal UVLO function blocks

potentially unstable output when the input voltage reaches the UVLO

threshold or less. This is aiming at making this circuit standby for low

power consumption.

The UTC UC4601 can be applied in battery-powered equipment,

hand-held communication equipment, cameras, video instruments

such as VCRs, camcorders, household electrical appliances.

FEATURES

* Input voltage varies from 2.3V to 18V

* Low temperature coefficient of output voltage: Typ. ±100ppm/°C

* Internal soft-start and protection function

* High efficiency up to 90% (TYP.)

* High output voltage accuracy: ±2%

* Standly current: 0.1μA (TYP.)

* CMOS output capability

ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

UC4601L-AF5-R

UC4601G-AF5-R

SOT-25

Tape Reel

UC4601L - AF5 - R

(1) Packing Type

(2) Package Type

(3) Lead Free

(1) R: Tape Reel

(2) AF5: SOT-25

(3) G: Halogen Free, L: Lead Free