UNISONIC TECHNOLOGIES CO., LTD

P1986

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R103-046.C

PWM CONTROL 3A

STEP-DOWN CONVERTER

DESCRIPTION

The UTC P1986 consists of 3A step-down switching

regulator with PWM control which includes a reference voltage

source, oscillation circuit, error amplifier, internal PMOS and etc.

The UTC P1986 can provide low-ripple power, high

efficiency, and perfect transient characteristics. The duty ratio

varies linearly from 0% to 100% in the PWM control. The error

amplifier circuit and soft-start circuit included in this device can

prevent overshoot at startup. Internally, the build-in compensation

block can reduce external component count. An enable function,

an over current protect (OCP) function and short circuit protect

(SCP) are also build inside, and when OCP happens, the

operation frequency will be reduced.

In application, the UTC P1986 is suitable for portable devices

when it works as an ideal power supply in SOP-8L package.

There is an internal P-channel power MOS, a coil, capacitors

inside and a diode connected externally that makes these ICs

step-down switching regulators.

FEATURES

* Input voltage varies from 3.6V to 28V

* Duty ratio varies from 0% to 100% PWM control

* With 330kHz typical oscillation frequency

*

Thermal shutdown and SCP function and soft-start, current limit,

enable function

* Low ESR output capacitor(Multi-layer chip capacitor) application

*

Built-in switch P-channel power MOS

* Halogen Free

ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

P1986L-S08-R

P1986G-S08-R

SOP-8

Tape Reel