Datasheet > LM3509

LM3509

更新时间： 2024-11-21 04:44:27

品牌	Logo	应用领域
美国国家半导体 - NSC		显示器
页数	文件大小	规格书
24页	1681K
描述
OLED Displays with Dual Current Sinks and I2C Compatible Brightness Control

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LM3509 数据手册

May 2007

LM3509

High Efficiency Boost for White LED's and/or OLED

Displays with Dual Current Sinks and I²C Compatible

Brightness Control

General Description

Features

The LM3509 current mode boost converter offers two sepa-

rate outputs. The first output (MAIN) is a constant current sink

for driving series white LED’s. The second output (SUB/FB)

is configurable as a constant current sink for series white LED

bias, or as a feedback pin to set a constant output voltage for

powering OLED panels.

Integrated OLED Display Power Supply and LED Driver

■

Drives up to 10 LED’s at 30mA

Drives up to 5 LED’s at 20mA and delivers up to 21V at

40mA

Over 90% Efficient

■

32 Exponential Dimming Steps

When configured as a dual output white LED bias supply, the

LM3509 adaptively regulates the supply voltage of the LED

strings to maximize efficiency and insure the current sinks re-

main in regulation. The maximum current per output is set via

a single external low power resistor. An I²C compatible inter-

face allows for independent adjustment of the LED current in

either output from 0 to max current in 32 exponential steps.

When configured as a white LED + OLED bias supply the

LM3509 can independently and simultaneously drive a string

of up to 5 white LED’s and deliver a constant output voltage

of up to 21V for OLED panels.

0.15% Accurate Current Matching Between Strings

Internal Soft-Start Limits Inrush Current

True Shutdown Isolation for LED’s

Wide 2.7V to 5.5V Input Voltage Range

21V Over-Voltage Protection

1.27MHz Fixed Frequency Operation

Low Profile 10-pin LLP Package (3mm x 3mm x 0.8mm)

General Purpose I/O

Active Low Hardware Reset

Output over-voltage protection shuts down the device if

V_OUTrises above 21V allowing for the use of small sized low

voltage output capacitors. The LM3509 is offered in a small

10-pin thermally- enhanced LLP package and operates over

the -40°C to +85°C temperature range.

Applications

Dual Display LCD Backlighting for Portable Applications

■

Large Format LCD Backlighting

OLED Panel Power Supply

Typical Application Circuits

30004361

300043

www.national.com

12 3 4 5 6 7...24

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与LM3509相关器件

型号	品牌	获取价格	描述	数据表
LM3509_08	NSC	获取价格	High Efficiency Boost for White LED
LM3509SD	NSC	获取价格	OLED Displays with Dual Current Sinks and I2C Compatible Brightness Control
LM3509SD/NOPB	TI	获取价格	用于白光 LED 和/或 OLED 显示屏的高效升压，具有双路电流阱 \| DSC \| 10
LM3509SDE/NOPB	TI	获取价格	用于白光 LED 和/或 OLED 显示屏的高效升压，具有双路电流阱 \| DSC \| 10
LM3509SDX	NSC	获取价格	OLED Displays with Dual Current Sinks and I2C Compatible Brightness Control
LM3509SDX/NOPB	TI	获取价格	用于白光 LED 和/或 OLED 显示屏的高效升压，具有双路电流阱 \| DSC \| 10
LM350A	NSC	获取价格	3-Amp Adjustable Regulators
LM350A	TI	获取价格	3A、35V、低噪声、高精度、可调节线性稳压器
LM350AKSTEEL	TI	获取价格	1.2 V-33V ADJUSTABLE POSITIVE REGULATOR, MBFM2, METAL CAN, TO-3, 2 PIN
LM350AMDC	TI	获取价格	1.2 V-33V ADJUSTABLE POSITIVE REGULATOR, UUC, DIE

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