UVLO

EN

Gate Driver

Anti

Shoot-Through

Current

Limit Comparator

SW

Limit

High Side

VIN

GND

PMOS

NMOS

PG

PG Comp

V

TH_UVLO

VIN

UVLO

Comp

Softstart

Control

Logic

VOUT

V

FB

Main

Comparator

Direct Control

& Compensation

Error

amplifier

Min. On

Min. OFF

VIN

VOUT

Timer

DCS

Control

Current

Limit Comparator

Limit

Low Side

Power Stage

UVLO

Slew Rate

Control

VOUT

Discharge

Load Switch

EN

UVLO

CTRL

LOAD

Internal

feedback

divider

network*

VSEL 1

VSEL 2

VSEL 3

VSEL 4

Ultra Low Power

Reference V

= 1.2V

REF

V

TH_100

VIN

Auto 100% Mode

Comp

100%

Mode

V

TH_PG

V

Discharge

OUT

V

FB

UVLO

EN

EN

CTRL

VOUT

* typical 50MW

V

REF

V

FB

TPS62740, TPS62742

SLVSB02B – NOVEMBER 2013 – REVISED JULY 2014

www.ti.com

9 Detailed Description

9.1 Overview

The TPS6274x is the first step down converter with an ultra low quiescent current consumption (360nA typ.) and

featuring TI's DCS-Control™ topology while maintaining a regulated output voltage. The device extends high

efficiency operation to output currents down to a few micro amperes.

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 (VOUT 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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