LP6312 datasheet(8/12 Pages) POWER

8 / 12 page

LP6312-02

May.-2013

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 8 of 12

Preliminary Datasheet

LP6312

Functional Description

PFM/PWM Operation

Each of the buck regulators can be operated at

PFM/PWM mode. If the output current is less than

150mA (typ.), the regulators automatically enters the

PFM mode. The output voltages and output ripples

at PFM mode are higher than the output voltages

and output ripples at PWM mode. But at very light

load, the PFM mode operation provides higher

efficiency than PWM mode operation.

Enable Control

The LP6312 is a high efficiency Power Management

IC which is designed for IPC and OTT applications.

It incorporates four 2A synchronous buck regulators

and can be controlled by individual EN pins. The

start-up time for each channel can be programmed

by using the circuit shown as below:

VIN

GND

100kΩ

10nF~100nF

VIN

Over Current Protection

The LP6312 internal four regulators have their own

cycle-by-cycle current limit circuits.

When the

inductor peak current exceeds the current limit

threshold, the output voltage starts to drop until FB

pin voltage is below the threshold, typically 30%

below the reference.

Thermal Shutdown

The LP6312 will automatically disable if the die

temperature is higher than the thermal shutdown

threshold point. To avoid unstable operation, the

hysteresis of thermal shutdown is about 20°C.

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