UVLO

EN

Gate Driver

Anti

Shoot-Through

Current

Limit Comparator

SW

Limit

High Side

VIN

GND

PMOS

NMOS

V

TH_UVLO

VIN

UVLO

Comp

Softstart

Control

Logic

VOS

V

FB

Main

Comparator

Direct Control

& Compensation

Error

amplifier

Min. On

Min. OFF

VIN

VOS

Timer

DCS

Control

Current

Limit Comparator

Limit

Low Side

Power Stage

UVLO

VOS

Internal

feedback

divider

network*

VSEL1

VSEL2

VSEL3

Ultra Low Power

Reference

V

TH_100

VIN

Auto 100% Mode

Comp

100%

Mode

V

Discharge

OUT

V

FB

UVLO

EN

EN

VOS

* typical 50MW

V

REF

TPS62743

SLVSCQ0 – JUNE 2015

www.ti.com

9 Detailed Description

9.1 Overview

The TPS62743 is a high frequency step down converter with ultra low quiescent current. The device operates

with a quasi fixed switching frequency typically at 1.2 MHz. Using TI's DCS-Control™ topology the device

extends the high efficiency operation area down to a few microamperes of load current during Power Save Mode

Operation.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 DCS-Control™

TI's DCS-Control™ (Direct Control with Seamless Transition into Power Save Mode) is an advanced regulation

topology, which combines the advantages of hysteretic and voltage mode control. Characteristics of DCS-

Control™ are excellent AC load regulation and transient response, low output ripple voltage and a seamless

transition between PFM and PWM mode operation. DCS-Control™ includes an AC loop which senses the output

voltage (VOS pin) and directly feeds the information to a fast comparator stage. This comparator sets the

switching frequency, which is constant for steady state operating conditions, and provides immediate response to

dynamic load changes. In order to achieve accurate DC load regulation, a voltage feedback loop is used. The

internally compensated regulation network achieves fast and stable operation with small external components

and low ESR capacitors.

8

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