CXLE8157高效率的电荷泵白光LED驱动器设备在主显示器中驱动四个白光LED在副显示器中驱动多达两个白光LED恒定的调节电流强度均匀

CXLE8157是一种高效率的电荷泵白光LED驱动器；该设备在主显示器中驱动多达四个白光LED，在副显示器中驱动多达两个白光LED，具有恒定的调节电流，强度均匀。电源电压范围从2.7伏到5.5伏，是锂离子电池应用的最佳选择。CXLE8157在1x、1.5x和2x电荷泵模式下工作，并根据输入电压自动切换电荷泵模式，以保持高功率效率所需的功率。CXLE8157为每个LED提供高达30毫安的电流，并允许多种方法，如ENM引脚上用于主显示器调光的脉冲宽度调制信号和ENS引脚上用于副显示器调光的脉冲宽度调制信号。两个控制逻辑管脚ENM和ENS允许禁用或启用主显示器和子显示器。在2x模式下，电源电流仅为2mA，ENM和ENS保持低电流20毫秒将允许设备以2mA静态电流进入关机模式。CXLE8157具有电流限制和短路保护功能。CXLE8157开关频率为1MHz，只需要四个1mF陶瓷电容器和一个电阻器，确保低输入电流纹波和EMI

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 CXLE8157 is a high efficiency charge pump white LED driver; the device drives up to four white LEDs in the main display and up to two white LEDs in the sub-display with regulated constant current for uniform intensity. The supply voltage ranges from 2.7V to 5.5V and it is optimized for a Li-ion battery application. The CXLE8157 operates in 1x, 1.5x, and 2x charge pump modes and automatically switches the charge pump modes depend on the input voltage to maintain the required power for high power efficiency. The CXLE8157 provides up to 30mA per LED and allows several methods such as the PWM signals on the ENM pin for main-display dimming and on the ENS pin for sub-display dimming. The two control logic pins, ENM and ENS, allow disabling or enabling the main and sub-displays. The supply current is only 2mA in 2x mode, and the ENM and ENS are kept low for 20ms will allow the device to enter shutdown mode with 2mA quiescent current. The CXLE8157 features current limit and short circuit protection. The CXLE8157 switches at 1MHz frequency and only requires four 1mF ceramic capacitors and one resistor, and ensures low input current ripple and EMI. The CXLE8157 is available in a 16-pin QFN package.

   产品特点 返回TOP

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· ±1.5% LED Current Matching 

· Powers Main and Sub-Display LEDs 

· High Efficiency Up to 90% Over Li-ion Battery Discharge 

· Output Current Up to 30mA per LED 

· 2.7V to 5.5V Operating Voltage 

· 1x/1.5x/2x Charge Pump Modes 

· Low Shutdown Current: 2mA Maximum 

· Low Input Ripple and EMI 

· Internal Soft-Start Limits Inrush Current 

· Short Circuit Current Limit 

· Thermal Shutdown Protection 

· Output Over-Voltage Protection 

· 16-pin QFN Package 

· Lead Free and Green Devices Available (RoHS Compliant)

   应用范围 返回TOP

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· Cellular Phone White LED Back Light 

· Portable Device 

· PDA, Handheld Computer 

· DSC

   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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Lighting and Display Product > White LED Driver
Part_No	Topology	Archi tecture	Input  Voltage (V)		Adj. Output  Voltage V	No.  of  LEDs	LED Current  (Max) (A)	Switch Current Limit (A)	Current Sense Voltage (typ)(V)	Switching Frequency (kHz)	Dimming Control	Package
			min	max	max
CXLE8153	Boost	CM	2.7	6	32	8	0.03	0.9	0.25	1000	Analog	SOT23-6
CXLE8154	Boost	VM	2.5	6	19	4	0.03	0.4	0.25	1000	Analog PWM	SOT23-6
CXLE8155	Boost	CM	2.7	21	30	8	0.6	3.5	0.5	1200	Analog	DFN3x3-10
CXLE8156	Charge  Pump	-	2.8	4.5	-	4	0.03	-	-	1000	Analog PWM  Digital	QFN4x4-16
CXLE8157	Charge  Pump	-	2.8	4.5	-	6	0.03	-	-	1000	Analog PWM Digital	QFN4x4-16
CXLE8158	Charge  Pump	-	2.8	4.5	-	4	0.03	-	-	1000	Analog PWM Digital	QFN3x3-16
CXLE8159	Boost	CM	2.5	6	24	6	0.03	1.2	0.1	1000	Analog PWM	SOT23-6
CXLE8160	Boost	CM	2.5	6	39	10	0.03	0.9	0.3	1000	Analog PWM	SOT23-6
CXLE8161	Boost	CM	2.5	6	24	6	0.03	1.2	0.2	1000	Analog PWM	SOT23-6
CXLE8162	Boost	CM	2.5	6	40	10	0.03	1.5	0.2	600	Analog PWM	TDFN2x2-6
CXLE8163	Boost	CM	2.5	6	24	6	0.03	2	0.2	1500	Analog PWM	SOT23-6
CXLE8164	Buck	CM	3	5.5	-							SOT23-5
CXLE8165	Boost	CM	6	24	65	17	0.18per string	3.3	0.5	200   ~ 900	External PWM Dimming/I2C	TDFN5x5-16
CXLE8166	Boost	CM	2.7	6	40	10	0.03	1.5	0.2	600	Analog  PWM	TDFN2x2-6