LM27966

SCL

SDIO

D1

GND

D2

D3

D4

D5

MAIN DISPLAY

VIO

I

2

C

Compatible

Interface

AUXILIARY

LED

1 PF

1 PF

1 PF

1 PF

RESET

Capacitors:

TDK C1608X5R1A105K

or equivalent

LM27966

www.ti.com

SNVS448B – JULY 2006 – REVISED MAY 2013

LM27966 White LED Driver with I2C Compatible Interface

Check for Samples: LM27966

1

FEATURES

DESCRIPTION

The LM27966 is a highly integrated charge-pump-

2

•

91% Peak LED Drive Efficiency

based display LED driver. The device can drive up to

•

No Inductor Required

6 LEDs in parallel with a total output current of

•

0.3% Current Matching

180mA. Regulated internal current sources deliver

excellent current and brightness matching in all LEDs.

•

Drives 6 LEDs with up to 30mA per LED

•

180mA of total driver current

The LED driver current sources are split into two

independently controlled groups. The primary group,

•

which can be configured with 4 or 5 LEDs, can be

•

Adaptive 1×- 3/2× Charge Pump

used to backlight the main phone display. An

•

Resistor-Programmable Current Settings

additional, independently controlled led driver is

provided for driving an indicator or other general

•

External Chip RESET Pin (RESET)

•

Extended Li-Ion Input: 2.7V to 5.5V

compatible

interface

that

allows

the

user

to

•

Small low profile industry standard leadless

independently control the brightness on each bank of

package, WQFN 24 : (4mm x 4mm x 0.8mm)

LEDs.

The device provides excellent efficiency without the

APPLICATIONS

use of an inductor by operating the charge pump in a

•

Mobile Phone Display Lighting

gain of 3/2, or in Pass-Mode. The proper gain for

maintaining current regulation is chosen, based on

•

PDAs Backlighting

LED forward voltage, so that efficiency is maximized

•

General LED Lighting

over the input voltage range.

The LM27966 is available in a small 24-pin Leadless

Leadframe WQFN-24 package.

Typical Application Circuit

1

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

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, 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.