LP6304B datasheet(9/12 Pages) POWER

9 / 12 page

LP6304B-01

May.-2013

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 9 of 12

Preliminary Datasheet

LP6304B

Functional Description

PFM/PWM Operation

Each of the buck regulators can be operated at

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

170mA (VOUT=1.2V), 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 LP6304B 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 LP6304B 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.

Thermal Shutdown

The LP6304B will automatically disabled 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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