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LPS4018-682ML PDF预览

LPS4018-682ML

更新时间： 2024-10-01 07:18:47
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亚德诺 - ADI 驱动器
页数 文件大小 规格书
16页 424K
描述
Four-String White LED Driver

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LPS4018-682ML 数据手册

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Four-String White LED Driver  
Data Sheet  
ADD5205  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
STEP-UP SWITCHING REGULATOR  
4-CHANNEL CURRENT SOURCES  
White LED driver based on inductive boost converter  
Input voltage range: 2.8 V to 18 V  
Internal compensation  
1 MHz fixed operating frequency  
28 V fixed overvoltage protection  
Built-in soft start for boost converter  
Drives up to 4 LED current sources  
LED current adjustable up to 25 mA for each channel  
DC current level brightness control with PWM input  
LED open fault protection  
BRIGHTNESS CONTROL LOGIC  
UNDERVOLTAGE LOCKOUT  
SOFT START  
THERMAL PROTECTION  
OVERVOLTAGE PROTECTION  
AUTODISABLE FOR LED OPEN  
Figure 1.  
General  
Thermal shutdown  
Undervoltage lockout  
12-lead, 3 mm × 3 mm × 0.75 mm LFCSP package  
APPLICATIONS  
Smart PCs, PMPs, tablet PCs, UMPCs, and notebooks  
GENERAL DESCRIPTION  
The ADD5205 is a white LED driver for backlight applications  
based on high efficiency, current mode, step-up converter  
technology. It is designed with a 0.3 Ω internal switch and 1 MHz  
fixed operating frequency. The ADD5205 contains four regulated  
constant current sources for uniform brightness intensity. Each  
current source is capable of driving up to 25 mA.  
The ADD5205 has multiple safety protection features to prevent  
any damage during fault conditions. If one or more LEDs are open,  
the device disables the faulty current regulator automatically.  
The internal soft start prevents inrush current during startup. A  
thermal shutdown protection feature prevents thermal damage.  
The ADD5205 is available in a low profile, thermally enhanced  
3 mm × 3 mm × 0.75 mm, 12-lead lead frame chip scale package  
(LFCSP) and is specified over the temperature range of −25°C  
to +85°C.  
The ADD5205 has four parallel strings of multiple series connected  
LEDs with 2ꢀ current matching. The device provides adjustable  
current sources that drive up to 25 mA using an external resistor.  
The LED current can be controlled by a PWM signal input on  
the PWM pin. An internal circuit translates the PWM signal to  
an analog signal with an external capacitor and linearly controls  
the LED current.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2011 Analog Devices, Inc. All rights reserved.  
 
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 		General Purpose Inductor, 6.8uH, 20%, 1 Element, Ferrite-Core, SMD, 1515, CHIP, 1515, HALO
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 		Low Profile Shielded Power Inductors
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 		Shielded Power Inductors
LPS4018-683ML_ COILCRAFT

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 		Very low DCR; excellent current handling, 4.0

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