lm2756tmx National Semiconductor Corporation, lm2756tmx Datasheet

lm2756tmx

Manufacturer Part Number

lm2756tmx

Description

Multi-display Inductorless Led Driver With 32 Exponential Dimming Steps In ?smd

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM2756TMX.pdf (16 pages)

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LM2756

Multi-Display Inductorless LED Driver with 32 Exponential

Dimming Steps in µSMD

General Description

The LM2756 is a highly integrated, switched-capacitor, multi-

display LED driver that can drive up to 8 LEDs in parallel with

a total output current of 180mA. Regulated internal current

sources deliver excellent current and brightness matching in

all LEDs.

The LED driver current sinks are split into three independently

controlled groups. The primary group (Group A) can be con-

figured to drive four, five or six LEDs for use in the main phone

display, while the secondary group (Group B) can be config-

ured to drive one, two or three LEDs for driving secondary

displays, keypads and/or indicator LEDs. An additional driver,

D1C, is provided for additional indicator lighting functions.

The device provides excellent efficiency without the use of an

inductor by operating the charge pump in a gain of 3/2 or in

Pass-Mode. The proper gain for maintaining current regula-

tion is chosen, based on LED forward voltage, so that effi-

ciency is maximized over the input voltage range.

The LM2756 is available in National’s tiny 20-bump, 0.4mm

pitch, thin µSMD package.

Typical Application Circuit

300097

Features

■

Applications

■

Drives up to 8 LEDs with up to 30mA of Diode Current

Each

32 Exponential Dimming Steps with 800:1 Dimming Ratio

for Group A (Up to 6 LEDs)

8 Linear Dimming States for Groups B (Up to 3 LEDs) and

D1C (1 LED)

Programmable Auto-Dimming Function

3 Independently Controlled LED Groups Via I

Compatible Interface

Up to 90% Efficiency

Total Solution Size < 21mm

Low Profile 20 Bump µSMD Package

(1.615mm × 2.015mm × 0.6mm)

0.4% Accurate Current Matching

Internal Soft-Start Limits Inrush Current

True Shutdown Isolation for LED’s

Wide Input Voltage Range (2.7V to 5.5V)

Active High Hardware Enable

Dual Display LCD Backlighting for Portable Applications

Large Format LCD Backlighting

Display Backlighting with Indicator Light

30009701

www.national.com

October 2007

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