LM27951SDX datasheet(1/10 Pages) NSC

No de pièce	LM27951SDX

Description	White LED Adaptive 1.5X/1X Switched Capacitor Current Driver

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Fabricant	NSC [National Semiconductor (TI)]

Site Internet	http://www.national.com

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LM27951

White LED Adaptive 1.5X/1X Switched Capacitor Current

Driver

General Description

The LM27951 is a switched capacitor white-LED driver ca-

pable of driving up to 4 LEDs with 30mA through each LED.

Its 4 tightly regulated current sources ensure excellent LED

current and brightness matching. LED drive current is pro-

grammed by an external sense resistor. The LM27951 oper-

ates over an input voltage range from 3.0V to 5.5V and

requires only four low-cost ceramic capacitors.

The LM27951 provides excellent efficiency without the use

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

or in a gain of 1. Maximum efficiency is achieved over the

input voltage range by actively selecting the proper gain

based on the LED forward voltage requirements.

The LM27951 uses constant frequency pre-regulation to

minimize conducted noise on the input. It has a fixed 750kHz

switching frequency optimized for portable applications. The

LM27951 consumes less than 1µA of supply current when

shut down.

The LM27951 is available in a 14-pin No-Pullback Leadless

Leadframe Package: LLP-14.

Features

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Drives up to 4 LEDs with up to 30mA each

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Regulated current sources with 0.2%(typ.) matching

n

3/2x, 1x Gain transition based on LED V

F

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Peak Efficiency Over 85%

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Input Voltage Range: 3.0V to 5.5V

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PWM Brightness Control

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Very Small Solution Size - NO INDUCTOR

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Fixed 750kHz Switching Frequency

n <

1µA Shutdown Current

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14-pin LLP Package: 4.0mm X 3.0mm X 0.8mm

Applications

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White LED Display Backlights

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White LED Keypad Backlights

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General Purpose LED Lighting

Typical Application Circuit

20171701

November 2005

DS201717

www.national.com

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LM27951SDX Fiches technique(PDF) 1 Page - National Semiconductor (TI)

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