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LM27953 White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost

November 2004

LM27953

White LED Driver with Four LED Current Sinks and 3/2x

Switched Capacitor Boost

General Description

The LM27953 is a charge-pump-based white-LED driver that

is ideal for mobile phone display backlighting. It is intended

to drive 4 LEDs for a main phone display backlight. Regu-

lated internal current sources deliver excellent current and

brightness matching in all LEDs.

The LED driver current sinks can be used to backlight a main

phone display with up to 4 LEDs. The low-side current

drivers accommodate common-anode-type LEDs. The cur-

rent sinks can also drive standard two-terminal LEDs, and

provide other general lighting functions (keypad lighting, fun

lighting, etc). The brightness of the LEDs can be adjusted

independently with an external resistor.

The LM27953 works off an extended Li-Ion input voltage

range (2.7V to 5.5V). Voltage boost is achieved with a high-

efficiency 3/2x-gain charge pump.

The LM27953 is available in National鈥檚 chip-scale 18-bump

micro SMD package.

Features

n

Drives 4 Individual Common-Anode LEDs with up to

20mA each for a Main Display Backlight

n

Independent Resistor-Programmable Current Setting

n

Excellent Current and Brightness Matching

n

High-Efficiency 3/2x Charge Pump

n

Extended Li-Ion Input: 2.7V to 5.5V

n

PWM Brightness Control: 100Hz - 1kHz

n

18-bump Thin Micro SMD Package:

(2.1mm x 2.4mm x 0.6mm)

Applications

n

n

n

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Mobile Phone Display Lighting

Mobile Phone Keypad Lighting

PDAs

General LED Lighting

Typical Application Circuit

20128001

漏 2004 National Semiconductor Corporation

DS201280

www.national.com

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