Preliminary Datasheet

LP6288

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LP6288

Version 0.1 JAN.-2018

Application Information(Continued)

The non-synchronous current mode buck1 converter

operates

with

PWM

architecture

with

750kHz

operation frequency and fast transient response. The

converter drivers an internal N-MOS, it need connect

a 100nF ceramic capacitor between the BST1 and

BKLX1 to provide gate driver voltage. It's necessary

to connect a Schottky diode between BKLX1 to GND.

The output voltage can be adjustable by internal

register. The converter has an internal soft start

3ms(Typ.).

Buck1 Over Current Protection

The Buck1 offers cycle-to-cycle and peak 3.5A(typ.)

current limiting for high-side MOS. The current limit is

relatively constant regardless of duty cycles.

Buck1 Over Voltage Protection

The buck converter has an over voltage protection.

When the BKO1 voltage rises above 110%, the Buck1

converter turn off the BKLX1. Until the voltage sense

falls below the over voltage threshold, the converter

will resume operation.

Buck1 Under Voltage Protection

When the BKO1 drop below 80% of its nominal

output, and the

status continues for 50ms, LP6288

will be shut down until VIN power restart.

Buck1 Short Circuit Protection

The LP6288 provides short circuit protection function

to prevent the device damage from short condition.

When the BKO1 sense is lower than 40% of the

setting voltage level, the LP6288 will be shut down

immediately until VIN power cycled.

Buck1 Diode Selection

When the power MOS turns off, the path of the

current is through the diode connected between the

switch output and ground. This diode must have a

minimum voltage drop and quick recovery time, so the

Schottky diodes are recommended. Whatever, make

sure the Schottky diode's reverse voltage rating is

greater than the maximum voltage, and the current

rating is greater than the maximum current.

The synchronous current mode buck2 converter

operates with PWM architecture with 2MHz operation

frequency and fast transient response. The converter

drivers an internal High site P-MOS and Low site

N-MOS. The output voltage can be adjustable by

internal register. The converter has an internal soft

start 3ms(Typ.).

Buck2 Over Current Protection

The Buck2 offers cycle-to-cycle and peak 3A(typ.)

current limiting for high-side MOS. The current limit is

relatively constant regardless of duty cycles.

Buck2 Over Voltage Protection

The buck converter has an over voltage protection.

When the BKO2 voltage rises above 110%, the Buck2

converter turn off the BKLX2. Until the voltage sense

falls below the over voltage threshold, the converter

will resume operation.

Buck2 Under Voltage Protection

When the output voltage

drop below 80% of its

nominal output, and the

status continues for 50ms,

LP6288 will be shut down until VIN power restart.

Buck2 Short Circuit Protection

The LP6288 provides short circuit protection function

to prevent the device damage from short condition.

When the BKO2 sense is lower than 40% of the

setting voltage level, the LP6288 will be shut down

immediately until VIN power cycled.

.