UC4601

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 15V

* 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

规格书UC4601