Datasheet > LM2759

LM2759

更新时间： 2024-11-13 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器开关闪光灯
页数	文件大小	规格书
2页	119K
描述
PRODUCT BRIEF 1A Switched Capacitor Flash LED Driver with I2C Compatible Interface

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LM2759 数据手册

November 20, 2008

LM2759 PRODUCT BRIEF

1A Switched Capacitor Flash LED Driver with I²C

Compatible Interface

General Description

Features

LM2759 is an integrated low-noise, high-current switched ca-

pacitor DC/DC converter with a regulated current source. The

device requires only four small ceramic capacitors making the

total solution area less than 22 mm²and the height less than

1 mm. The LM2759 is capable of driving loads up to 1A from

a single-cell Li-Ion battery. Maximum efficiency is achieved

over the input voltage range by actively selecting the proper

gain based on the LED forward voltage and current require-

ments.

Up to 1A Output Current

■

Solution Area < 22 mm²

No Inductor Required

90% Peak Efficiency

Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency

Load Disconnect in Shutdown

■

Accurate Input Current Control During Gain Transitions

Flash Time-Out

The LED current can be programmed up to 1A via an I²C-

compatible interface, along with eight selectable Flash Time-

Out durations. One high-current Flash LED can be driven

either in a high-power Flash mode or a low-power Torch

mode. The Strobe pin allows the flash to be toggled via a

Flash enable signal from a camera module. The TX input pin

limits the Flash LED current to the Torch current level during

a RF PA pulse, to reduce high loads on the battery. Internal

soft-start circuitry limits the amount of inrush current during

start-up.

TX Input Pin Ensures Synchronization with RF Power

Amplifier Pulse

Torch, Flash, and Indicator Modes

External Flash Enable via Strobe Input Pin

Strobe Input Disable via I²C

■

Programmable Flash Pulse Duration, and Torch and Flash

Currents via I²C-Compatible Interface

1MHz Constant Frequency Operation

■

Low Profile 12–Pin LLP (3mm x 3mm x 0.8mm)

LM2759 is offered in a small 12-pin thermally enhanced LLP

package.

Applications

Notice: This document is not a full datasheet. For more

information regarding this product or to order samples,

please contact your National Semiconductor sales office

or visit http://www.national.com/support/dir.html.

Camera Flash in Cellular Phones

■

Typical Application Circuit

30069301

300693

www.national.com

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与LM2759相关器件

型号	品牌	获取价格	描述	数据表
LM2759_10	NSC	获取价格	1A Switched Capacitor Flash LED Driver with I2C Compatible Interface
LM2759SD	NSC	获取价格	1A Switched Capacitor Flash LED Driver with I2C Compatible Interface
LM2759SD/NOPB	TI	获取价格	具有 I2C 兼容接口、1A 开关电容器 LED 闪光灯驱动器 \| DQB \| 12 \|
LM2759SDX	NSC	获取价格	1A Switched Capacitor Flash LED Driver with I2C Compatible Interface
LM2759SDX/NOPB	TI	获取价格	具有 I2C 兼容接口、1A 开关电容器 LED 闪光灯驱动器 \| DQB \| 12 \|
LM2760	NSC	获取价格	3.3V Regulated Switched Capacitor Voltage Converter
LM2760M5	NSC	获取价格	3.3V Regulated Switched Capacitor Voltage Converter
LM2760M5	ROCHESTER	获取价格	SWITCHED CAPACITOR REGULATOR, 750kHz SWITCHING FREQ-MAX, PDSO5, SOT-23, 5 PIN
LM2760M5/NOPB	ROCHESTER	获取价格	SWITCHED CAPACITOR REGULATOR, 750kHz SWITCHING FREQ-MAX, PDSO5, SOT-23, 5 PIN
LM2760M5X	NSC	获取价格	3.3V Regulated Switched Capacitor Voltage Converter

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