Datasheet > LM2756_0712

LM2756_0712

更新时间： 2024-09-25 04:44:35

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器电感器
页数	文件大小	规格书
16页	508K
描述
Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in micro SMD

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LM2756_0712 数据手册

December 5, 2007

LM2756

Multi-Display Inductorless LED Driver with 32 Exponential

Dimming Steps in micro SMD

General Description

Features

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.

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 I²C

■

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.

■

Compatible Interface

Up to 90% Efficiency

Total Solution Size < 21mm²

■

Low Profile 20 Bump micro SMD Package

(1.615mm × 2.015mm × 0.6mm)

0.4% Accurate Current Matching

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.

■

Internal Soft-Start Limits Inrush Current

True Shutdown Isolation for LED’s

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

pitch, thin micro SMD package.

Wide Input Voltage Range (2.7V to 5.5V)

Active High Hardware Enable

■

Applications

Dual Display LCD Backlighting for Portable Applications

■

Large Format LCD Backlighting

Display Backlighting with Indicator Light

Typical Application Circuit

30009701

300097

www.national.com

12 3 4 5 6 7...16

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与LM2756_0712相关器件

型号	品牌	获取价格	描述	数据表
LM2756TM	NSC	获取价格	Multi-Display Inductorless LED Driver with 32
LM2756TM/NOPB	TI	获取价格	具有 32 指数调光步进、采用微型 SMD 封装的多显示无电感器 LED 驱动器 \| YF
LM2756TMX	NSC	获取价格	Multi-Display Inductorless LED Driver with 32
LM2756TMX/NOPB	TI	获取价格	具有 32 指数调光步进、采用微型 SMD 封装的多显示无电感器 LED 驱动器 \| YF
LM2757	NSC	获取价格	Switched Capacitor Boost Regulator with High Impedance Output in Shutdown
LM2757	TI	获取价格	具有输出（停机时）的开关电容器升压稳压器
LM2757TM	NSC	获取价格	Switched Capacitor Boost Regulator with High Impedance Output in Shutdown
LM2757TM/NOPB	TI	获取价格	具有输出（停机时）的开关电容器升压稳压器 \| YFQ \| 12 \| -30 to 85
LM2757TMX	NSC	获取价格	Switched Capacitor Boost Regulator with High Impedance Output in Shutdown
LM2757TMX/NOPB	TI	获取价格	具有输出（停机时）的开关电容器升压稳压器 \| YFQ \| 12 \| -30 to 85

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