Actual Size

(5,0 mm x 6,4 mm)

Actual Size

(4,15 mm x 4,15 mm)

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FEATURES

DESCRIPTION

APPLICATIONS

OFF

ON

OFF

ON

OFF

ON

VBAT

LBI

SKIPEN

EN

LDOEN

SWN

VOUT

FB

PGOOD

LBO

LDOIN

LDOOUT

LDOSENSE

GND

PGND

Control

Inputs

Control

Outputs

TPS61120

Battery

SWP

10 mH

10 mF

100 mF

2.2 mF

TPS61120

TPS61122, TPS61121

SLVS427C – JUNE 2002 – REVISED APRIL 2004

SYNCHRONOUS BOOST CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO

•

Synchronous, 95% Efficient, Boost Converter

The TPS6112x devices provide a complete power

With 500-mA Output Current From 1.8-V Input

supply solution for products powered by either a

one-cell Li-Ion or Li-Polymer or a two up to 4 cells

•

Integrated 200-mA Reverse Voltage Protected

Alkaline, NiCd or NiMH batteries. The devices can

LDO for DC/DC Output Voltage Post Regu-

generate two stable output voltages that are either

lation or Second Output Voltage

adjusted by an external resistor divider or fixed

•

40-µA (Typical) Total Device Quiescent Cur-

internally on the chip. It also provides a simple

rent

solution for generating 3.3 V out of a one-cell Li-Ion

or Li-Polymer battery at a maximum output current of

•

Input Voltage Range: 1.8-V to 5.5-V

at least 200 mA with supply voltages down to 1.8 V.

•

Fixed and Adjustable Output Voltage Options

The implemented boost converter is based on a fixed

up to 5.5-V

frequency, pulse-width-modulation (PWM) controller

•

Power Save Mode for Improved Efficiency at

using a synchronous rectifier to obtain maximum

Low Output Power

efficiency. The maximum peak current in the boost

switch is limited to a value of 1600 mA.

•

Low Battery Comparator

•

Power Good Output

The converter can be disabled to minimize battery

drain. During shutdown, the load is completely dis-

•

Low EMI-Converter (Integrated Antiringing

connected from the battery. A low-EMI mode is

Switch)

implemented to reduce ringing and in effect lower

•

Load Disconnect During Shutdown

radiated electromagnetic energy when the converter

•

Overtemperature Protection

enters the discontinuous conduction mode. A power

good output at the boost stage simplifies control of

•

Available in a Small 4mm x 4mm QFN-16 or in

any connected circuits like cascaded power supply

a TSSOP-16 Package

stages or microprocessors.

The built-in LDO can be used for a second output

voltage derived either from the boost output or

•

All Single Cell Li or Dual Cell Battery or USB

directly from the battery. The LDO can be enabled

Powered Products as MP-3 Player, PDAs, and

separately i.e., using the power good of the boost

Other Portable Equipment

stage. The device is packaged in a 16-pin QFN

•

Dual Input or Dual Output Mode

package measuring 4 mm x 4 mm (RSA) or in a

•

Simple Li-Ion to 3.3-V Conversion

16-pin TSSOP (PW) package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.