Datasheet > LM27953TLX

LM27953TLX

更新时间： 2024-11-12 22:14:47

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器开关
页数	文件大小	规格书
11页	679K
描述
White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost

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LM27953TLX 数据手册

November 2004

LM27953

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

Switched Capacitor Boost

General Description

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

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.

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 Mobile Phone Display Lighting

n Mobile Phone Keypad Lighting

n PDAs

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.

n General LED Lighting

The LM27953 is available in National’s chip-scale 18-bump

micro SMD package.

Typical Application Circuit

20128001

DS201280

www.national.com

12 3 4 5 6 7...11

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