Datasheet > LM3530

LM3530

更新时间： 2024-09-27 11:34:59

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
4页	328K
描述
High Efficiency White LED Driver with Programmable Ambient Light Sensing Capability and I2C Compatible Interface

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LM3530 数据手册

November 29, 2010

LM3530 PRODUCT BRIEF

High Efficiency White LED Driver with Programmable

Ambient Light Sensing Capability and I²C Compatible

Interface

General Description

Features

The LM3530 current mode boost converter supplies the pow-

er and controls the current in up to 11 series white LED’s. The

839mA current limit and 2.7V to 5.5V input voltage range,

makes the device a versatile backlight power source ideal for

operation in portable applications.

Drives up to 11 LED’s in series

■

1000:1 Dimming Ratio

90% Efficieny

Programmable Dual Ambient Light Sensor Inputs with

internal ALS Voltage Setting Resistors

The LED current is adjustable from 0 to 29.5mA via an I²C

compatible interface. The 127 different current steps and 8

different maximum LED current levels give over 1000 pro-

grammable LED current levels. Additionally, PWM brightness

control is possible through an external logic level input.

I²C Programmable Logarithmic or Linear Brightness

Control

■

External PWM Input for Simple Brightness Adjustment

■

True Shutdown Isolation for LED's and Ambient Light

Sensors

Additionally, the device features two Ambient Light Sensor

inputs. These are designed to monitor analog output ambient

light sensors and provide programmable adjustment of the

LED current with changes in ambient light. Each ambient light

sensor input has independently programmable internal volt-

age setting resistors which can be made high impedance to

reduce power during shutdown. The LM3530's 500kHz

switching frequency allows for high converter efficiency over

a wide output voltage range accommodating from 2 to 11 se-

ries LEDs. Finally, the support of Content Adjusted Backlight-

ing maximizes battery life while maintaining display image

quality.

Internal Soft-Start Limits Inrush Current

■

Wide 2.7V to 5.5V Input Voltage Range

40V Over-Voltage Protection

500 kHz Fixed Frequency Operation

839mA Peak Current Limit

Low Profile 12-bump micro SMD Package

Applications

Smartphone LCD Backlighting

■

Personal Navigation LCD Backlighting

The LM3530 is available in a tiny 12-bump (1.6mm × 1.2mm

× 0.425mm) micro SMD package and operates over the -40°

C to +85°C temperature range.

2 to 11 series White LED Backlit Display Power Source

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

imformation regarding this product, or to order samples,

please contact your National Semiconductor sales office

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

LM3530 Layout Example

30086683

300866

www.national.com

12 3 4

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与LM3530相关器件

型号	品牌	获取价格	描述	数据表
LM3530TME-40/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFQ \| 12
LM3530TMX-40	TI	获取价格	LED DISPLAY DRIVER
LM3530TMX-40/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFQ \| 12
LM3530UME-25A/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFZ \| 12 \| -30 to
LM3530UME-25ANOPB	NSC	获取价格	IC LED DISPLAY DRIVER, PBGA12, 1.215 X 1.615 MM, 0.425 MM HEIGHT, USMD-12, Display Driver
LM3530UME-40/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFZ \| 12 \| -30 to
LM3530UME-40B/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFZ \| 12
LM3530UME-40BNOPB	NSC	获取价格	IC LED DISPLAY DRIVER, PBGA12, 1.215 X 1.615 MM, 0.425 MM HEIGHT, USMD-12, Display Driver
LM3530UME-40NOPB	NSC	获取价格	IC LED DISPLAY DRIVER, PBGA12, 1.215 X 1.615 MM, 0.425 MM HEIGHT, USMD-12, Display Driver
LM3530UMX-25A/NOPB	TI	获取价格	具有可编程环境光感应功能的高效白光 LED 驱动器 \| YFZ \| 12 \| -30 to

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