(3,25 mm x 3,25 mm)

www.ti.com

FEATURES

DESCRIPTION

APPLICATIONS

C IN

L1

VIN

22

µF

4.7

µH

2.7 V . . 5.5 V

GND

TPS61058

GND

PVIN

EN

VIN

SW

VOUT

FB

PGND

C1, C2, C3

x3

D1

C3

Rs

R2

R1

IOK

R3

R4

FLASH ON (0/1.8 V)

22

µF

39 k

Ω

22 k

Ω

56 k

Ω

1.5

Ω

62 k

Ω

1 nF

(COG)

R5

5.6 k

Ω

0

10

20

30

40

50

60

70

80

90

100

2.70 3.10

3.50 3.90

4.30

4.70

5.10

5.50

V - Input Voltage - V

I

I

= 500 mA @ V = 3.7 V

LED

F

TPS61058

TPS61059

SLVS572B – APRIL 2005 – REVISED DECEMBER 2005

SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE

HIGH POWER WHITE LED DRIVER

•

80% Efficient Synchronous Boost Converter

The

TPS61058/9

devices

are

fixed

frequency,

synchronous

boost

dc-dc

converters

with

an

– 500-mA LED Current From 3.3-V Input

integrated down conversion mode. The devices are

(TPS61058)

optimized for driving high power single cell white

– 800-mA LED Current From 3.3-V Input

LEDs up to 800 mA from a 2.7-V to 5.5-V input. The

(TPS61059)

LED current can be programmed to different levels

•

Input Voltage Range: 2.7 V to 5.5 V

(e.g. torch, flashlight) by a set of external resistors.

•

Fixed Frequency 650 kHz (Typ) Operation

The boost converter is based on a 650 kHz fixed

•

LED Disconnect During Shutdown

frequency, pulse-width-modulation (PWM) controller

using a synchronous rectifier to obtain maximum

•

Open/Shorted LED Protection

efficiency. The maximum peak current in the boost

•

Over-Temperature Protection

switch is limited to 1000 mA (TPS61058) and 1500

•

Low Shutdown Current: 100 nA (Typ)

mA (TPS61059).

•

The converter can be disabled to maximize battery

•

Small 3mm x 3mm QFN-10 Package

life. In the shutdown mode, the load is completely

disconnected and the current consumption is reduced

to less than 1 µA. Built-in precharge and soft-start

circuitry prevents excessive inrush current during

•

Torch/Camera White LED Supply for Cell

start-up.

Phones, Smart-Phones and PDAs

The

device

is

packaged

in

a

10-pin

QFN

PowerPAD™ package measuring 3 mm x 3 mm

(DRC).

Figure 1. 500 mA Flashlight Application

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.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, 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.