Datasheet > LM2755

LM2755

更新时间： 2024-09-25 00:04:31

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器泵
页数	文件大小	规格书
14页	1667K
描述
Charge Pump LED Controller with I2C Compatible Interface in Micro SMD

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LM2755 数据手册

October 2007

LM2755

Charge Pump LED Controller with I2C Compatible Interface

in Micro SMD

General Description

Features

The LM2755 is a charge-pump-based, constant current LED

driver capable of driving 3 LEDs with a total output current up

to 90mA. The diode current waveforms of each LED can be

trapezoidal with timing and level parameters (rise time, fall

time, high level, low level, delay, high time, low time) pro-

grammed via an I²C compatible interface. The 32 brightness

levels found on the LM2755 are exponentially spaced (as op-

posed to linearly spaced) to better match the response of the

human eye to changing brightness levels.

90% Peak Efficiency

■

Total solution size < 13mm²

No Inductor Required: Only 4 Inexpensive Ceramic Caps

3 Independently Controlled Constant Current Outputs

Programmable Trapezoidal Dimming Waveform on Each

Output

■

Programmable Timing Control Via Internal Registers and

External Clock Synchronization Input

■

32 Exponential Dimming Steps with 800:1 Dimming Ratio

Programmable brightness control via I²C compatible

interface

Hardware Enable Pin

The device requires only four small and low-cost ceramic ca-

pacitors. The LM2755 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.

■

Wide input voltage range: 2.7V to 5.5V

Tiny 18-bump thin micro SMD: 1.8mm x 1.6mm x 0.6mm

The pre-regulation scheme used by the LM2755 is optimized

to ensure low conducted noise on the input. An internal soft-

start circuitry eliminates high inrush current at start-up. The

LM2755 consumes 3µA (typ.) of supply current in shut-down.

Applications

Indicator LEDs

■

The LM2755 is available in National’s tiny 18-bump thin micro

SMD package.

Keypad LED Backlight

Display LED Backlight

Fun-light LEDs

Typical Application Circuit

20180904

Minimum Solution Size

20180901

201809

www.national.com

12 3 4 5 6 7...14

中文翻译

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与LM2755相关器件

型号	品牌	获取价格	描述	数据表
LM2755TM	NSC	获取价格	Charge Pump LED Controller with I2C Compatible Interface in Micro SMD
LM2755TM/NOPB	TI	获取价格	采用微型 SMD 封装、具有 I2C 兼容接口的电荷泵 LED 控制器 \| YFQ \| 1
LM2755TMX	NSC	获取价格	Charge Pump LED Controller with I2C Compatible Interface in Micro SMD
LM2755TMX/NOPB	TI	获取价格	采用微型 SMD 封装、具有 I2C 兼容接口的电荷泵 LED 控制器 \| YFQ \| 1
LM2756	NSC	获取价格	Multi-Display Inductorless LED Driver with 32
LM2756	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
LM2756_0712	NSC	获取价格	Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in micro SMD
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

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