CXLE8176充电泵LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制由一个锂离子电池或三到四个镍镉镍氢或碱性电池供电的所有应用

CXLE8176是一款充电泵，具有用于LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制。电源电压从2.7伏到5.5伏不等，非常适合由一个锂离子电池或三到四个镍镉、镍氢或碱性电池供电的所有应用。该装置为每个LED提供恒定电流，初始电流值可由外部电阻器设置。利用1×/1.5×分数变换技术，结合极低漏电流源，实现了高效率。
CXLE8176能够以每通道30mA的速度从2.7V到5.5V的输入驱动多达四个LED通道。此外，电流控制电荷泵确保低输入电流纹波和电磁干扰。低外部部件计数（两个0.47μF飞行电容器和两个1μF小电容器，在车辆识别号和输出电压）使该部件非常适合小型电池供电应用。

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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The CXLE8176 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications. The supply voltage ranges from 2.7V to 5.5V, it is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or alkaline battery cells.

 

The device provides a constant current for each LED, and the initial current value can be set by an external resistor. High efficiency is achieved by utilizing a 1×/1.5× fractional conversion technique in combination with very low dropout current sources.

 

The CXLE8176 is capable of driving up to four channels of LEDs at 30mA per channel from a 2.7V to 5.5V input. Additionally, the current controlled charge pump ensures low input current ripple and EMI. A low external part count (two 0.47μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes this part ideally suited for small, battery-powered applications.

 

The CXLE8176 is available in a Green TQFN-3×3-16L package, and is rated over the -40℃ to +85℃ temperature range.

   产品特点 返回TOP

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• Input Voltage Range: 2.7V to 5.5V
• Drives up to 4 LEDs at 30mA Each
• LED Brightness Control Through PWM Control Signal
• High Efficiency by Fractional Conversion with 1×
    and 1.5× Modes
• Switching Frequency: 1MHz
• Regulated Output Current with 0.5% Matching
• Internal Soft-Start Limits Inrush Current
• Low Input Ripple and Low EMI
• Over-Current and Over-Temperature Protection
• Under-Voltage Lockout with Hysteresis
• Available in Green TQFN-3×3-16L Package

   应用范围 返回TOP

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Cellular Phones
Smart Phones
Digital Cameras
Handheld PCs
Camcorders
PDAs
Keypad Backlight

   技术规格书（产品PDF) 返回TOP 

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     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

 

产品封装图 返回TOP

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电路原理图 返回TOP

 

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白光LED驱动器
Product	LED Connection	CH	Iq(μA)	SHDN Iq(μA)	Dimming	Package
CXLE8196	Common Anode	1	60	1	PWM	SOT-23-6
CXLE8176	Common Anode	4	100	1	PWM	TQFN-3x3-16L
CXLE8177	Common Anode	3	100	1	PWM	TQFN-3x3-16L
CXLE8178	Common Anode	4	240	1	PWM	SOT-23-6
CXLE8179	Common Anode	4	100	1	One-Wire	TQFN-3x3-16L
CXLE8180	Common Anode	4	550	5	One-Wire	TQFN-3x3-16L TDFN-2x2-8L MSOP-8
CXLE8181	Common Cathode	4	300	10	One-Wire	TQFN-3x3-16L
CXLE8182	Common Anode	6	210	1	One-Wire	TQFN-3x3-16L
CXLE8183	Common Cathode	6	300	10	One-Wire	TQFN-4x4-16L
CXLE8184	Common Anode	6	155	2.5@VIN =4.2V	PWM	TQFN-3x3-16L
CXLE8185	Common Anode	8	155	2.5@VIN = 4.2V	PWM	TQFN-3x3-20L
CXLE8186	Common Anode	8	155	2.5@VIN =4.2V	One-Wire	TQFN-3x3-20L
CXLE8187	Common Anode	1	200	1	PWM	TSOT-23-6
CXLE8188	Common Anode	1	200	1	One-Wire	TSOT-23-6
CXLE8189	Common Anode	1	400	1	PWM	TDFN-2x2-6L TSOT-23-6
CXLE8190	Common Anode	1	45	1	One-Wire	TDFN-2x2-8L
CXLE8191	Common Anode	1	200	1	PWM	TSOT-23-6
CXLE8192	Common Anode	1	400	1	PWM	TDFN-2x2-6L TSOT-23-6
CXLE8193	Common Anode	1	200	1	One-Wire	TDFN-2x2-8L
CXLE8194	Common Anode	1	200	1	PWM	TDFN-2x2-8L
CXLE8195	Common Anode	1	220	1	PWM	TDFN-2x2-6L