120mA四通道电流源自动模式电荷泵高性能白光LED驱动器低漏失电流源CXLE8179每30毫安可驱动多达4个LED通过单个LED亮度控制导线接口16步亮度控制高性能的白色LED驱动程序

CXLE8179是一款高性能的白色LED驱动程序。它集成了电流源和自动模式选择电荷泵。该部分采用1×/1.5×分数电荷泵和低漏电流源，保持了高效率。小等效1×模开环电阻和极低的电流源压降，延长了1×模工作时间，优化了锂离子电池在白光LED应用中的效率。
CXLE8179最多支持4个白色LED并调节恒定电流，初始值可由外部电阻器设置。该部分实现了4位DAC，用于亮度控制。用户可以通过串行脉冲轻松配置0.5mA到30mA的LED电流。白色led电流的调光可以通过在EN引脚上施加脉冲信号来实现。用户可设置16级电流。工作电压范围为2.7V～5.5V，内部软启动电路有效地降低了启动和模式转换时的涌入电流。关闭时，负载与车辆识别号断开，关闭电流小于1μA。

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 CXLE8179 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing a 1× / 1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of 1× mode and optimize the efficiency of Li-ion battery in white LED applications.The CXLE8179 supports up to 4 white LEDs and regulates a constant current which the initial value can be set by an external resistor. The part implements a 4-bit DAC for brightness control. Users can easily configure the LED current from 0.5mA to 30mA by a serial pulse. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft start circuitry effectively reduces the in-rush current while both start-up and mode transition. The load is disconnected from VIN while shutdown and the shutdown current is less than 1μA.CXLE8179 is available in Green TQFN-3×3-16L package. It operates over an ambient temperature range of -40℃ to +85℃

   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 Single
    Wire Interface
• 16-Step Brightness Control
• High Efficiency by Fractional Conversion with
    1× and 1.5× Modes
• Switching Frequency: 1MHz
• Regulated Output Current with 1% Matching
• Internal Soft-Start Limits Inrush Current
• Low Input Ripple and Low EMI
• Over-Current and Over-Temperature Protection
• Under-Voltage Lockout with Hysteresis
• Operating Temperature Range: -40℃ to +85℃
• Available in Green TQFN-3×3-16L Package

   应用范围 返回TOP

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Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply

   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