RT2810A datasheet(3/19 Pages) RICHTEK

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RT2810A/B

DS2810A/B-06 November 2016

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Function Block Diagram

Operation

The RT2810A/B is a synchronous step-down converter

with advanced Constant On-Time control mode. Using the

ACOTTM control mode can reduce the output capacitance

and fast transient response. It can minimize the component

size without additional external compensation network.

Power Good

After soft-start has finished, the power good function will

be activated. The PGOOD pin is an open-drain output. If

the FB voltage is lower than 80% VREF or higher than

120% VREF, the PGOOD pin will be pulled low.

PVCC

The regulator provides 5V power to supply the internal

control circuit. 1

μF ceramic capacitor for decoupling and

stability is required.

Soft-Start

In order to prevent the converter output voltage from

overshooting during the startup period, the soft-start

function is necessary. The soft-start time is adjustable

by an external capacitor.

Current Protection

The inductor current is monitored via the internal switches

cycle-by-cycle. Once the output voltage drops under UV

threshold, the RT2810A/B will enter hiccup mode or latch

off mode.

UVLO Protection

To protect the chip from operating at insufficient supply

voltage, the UVLO is needed. When the input voltage of

VIN is lower than the UVLO falling threshold voltage, the

device will be lockout.

Thermal Shutdown

When the junction temperature exceeds the OTP

threshold value, the IC will shut down the switching

operation. Once the junction temperature cools down and

is lower than the OTP lower threshold, the converter will

autocratically resume switching.

POR &

Reg

UGATE

LGATE

Driver

BOOT

PVCC

Control

VBIAS

On-Time

VIN

Min.

Off-Time

Ripple

Gen.

VREF

Comparator

GND

PVCC

6µA

PVCC

UV & OV

VIN

Comparator

0.9 VREF

PGOOD

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