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FEATURES

DESCRIPTION

APPLICATIONS

VIN

C1+

C1−

C2+

C2−

EN1

EN2

GND

PGND

VOUT

D1

D2

D3

D4

D5

ISET

0.47 mF

0.47 mF

1 mF

1 mF

VIN = 2.7 V

to 6.5 V

TPS60230

SLVS516A – MAY 2004 – REVISED JUNE 2004

WHITE LED CHARGE PUMP CURRENT SOURCE

WITH PWM BRIGHTNESS CONTROL

•

Regulated Output Current With 0.3%

The TPS60230 charge pump is optimized for white

Matching Over Temperature

LED supplies in backlit color display applications. The

device provides a constant current, set by an external

•

Drives up to 5 LEDs at 25 mA Each

resistor, for each LED. The supply voltage ranges

•

LED Brightness Control Through PWM

from 2.7 V to 6.5 V and is ideally suited for all

Control Signal

applications powered by a single LI-Ion battery cell or

•

High Efficiency by Fractional Conversion

three to four NiCd, NiMH, or Alkaline battery cells.

With 1x and 1.5x Modes

The TPS60230 provides up to 25 mA per LED, for a

total of 125 mA, for input voltages ranging from 3.1 V

•

1 MHz Switching Frequency

to 6.5 V. High efficiency is achieved by utilizing a

•

2.7 V to 6.5 V Operating Input Voltage Range

1x/1.5x fractional conversion technique in combi-

•

Internal Softstart Limits Inrush Current

nation with very low dropout current sources. Ad-

ditionally, the current controlled charge pump ensures

•

Low Input Ripple and Low EMI

low input current ripple and EMI. Only two external 1

•

Overcurrent and Overtemperature Protected

µF and two 0.47 µF capacitors are required to build a

•

Undervoltage Lockout With Hysteresis

complete small and low cost power supply solution.

The TP60230 switches at 1 MHz operating frequency

•

Ultra-Small 3mm x 3mm QFN Package

and is available in a small 16-pin QFN (RGT)

package to keep board space to a minimum.

•

White LED Backlight for Color Displays in

Cellular Phones, Smart Phones, PDAs,

Handheld PCs, Digital Cameras,

and Camcorders

•

Key Backlight

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 © 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.