The jtm2126 is a 1.3MHz PWM boost switching regu- lator desi

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)
      The jtm2126 is a 1.3MHz PWM boost switching regu- lator designed for
constant-current white LED driver applications.
       The jtm2126   can drive a string of up to 4 white LEDs from a 3.2V supply
or 6 white LEDs from a 5V supply in series, ensuring uniform brightness and eliminating several ballast resistors. The jtm2126 implements a constant frequency 1.3MHz PWM control scheme.The high frequency PWM operation
also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 95·mV, which reduces the power dissipation in the current setting resistor.The jtm2126   is equipped with OVP protection ability,the SW pin monitors the output voltage and will turn off the device if an overvoltage condition is present to prevent damage from an open circuit condition.
     The jtm2126 is available in SOT-23-5 package.

二.产品特点(Features)
1.)Inherently Uniform LED Current
2.)High Efficiency up to 84%
3.)Drives up to 4 LEDs from a 3.2V Supply or 6
4.)LEDs from a 5V Supply
5.)1.3MHz PWM Operation Frequency
6.)Requires Only 0.22µF Output Capacitor
7.)Shutdown Current: < 1µA
8.)Built-in Output Overvoltage Protection

三,应用范围 (Applications)
Digital Cameras
LCD modules
GPS Receivers
Cellular Phones
PDAs, Handheld Computers

四.下载产品资料PDF文档

jtm2126

五,产品封装图 (Package)

Pin Number	Pin Name	Function
1	SW	Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not extend this limit. If the voltage on this pin is higher than the overvoltage protection thre- shold (OVP), the device comes back to shutdown mode. To restart the chip, one must then send a low to high sequence on shutdown pin or switch off the V supply. IN
2	GND	Ground Pin.
3	FB	Voltage Feedback. Reference voltage is 95mV.
4	SHDN	Shutdown Pin. Connect to 1.5V or higher to enable device; Connect to 0.4V or less to disable device.
5	V IN	Input Supply Pin. Must be locally bypassed.

六.电路原理图

七,功能概述

Parameter	Symbol	Value	Unit
Input Voltage	V IN	10	V
SW Voltage		36	V
FB Voltage		10	V
SHDN Voltage		10	V
Maximum Junction Temperature		125	o C
Storage Temperature Range	T STG	-65 to 150	o C
Lead Temperature (Soldering, 10sec)	T LEAD	300	o C
ESD (Machine Model)		250	V

八,相关产品

小屏白灯背光驱动IC

型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM2126	PWM	2.5V-10V	29V	0.1V	320mA	85%	0.1uA	1.3MHz	PWM		SOT-25

JTM5121A	PWM	2.2V-6.0V	17V	0.25V	400mA	82%	3mA	1.4MHz	PWM	100Hz-1KHz	SOT-26



大中屏白灯背光驱动IC

型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM5665	PWM	2.2V-6.0V	17V	0.25V	700mA	82%	3mA	1.4MHz	PWM	100Hz-1KHz	SOT-26



JTM5662	PWM	2.5V-6.0V	23V	0.25V	1.0A	88%	0.4mA	1.0MHz	PWM	100Hz-10KHz	SOT-26



JTM5666	PWM	2.5V-6.0V	30V	0.104V	400mA	87%	0.2mA	1.2MHz	PWM	小于1KHz	SOT-26



JTM5666B	PWM	2.7V-6.0V	38V	0.2V	1A	91%	5uA	0.8MHz	PWM		SOT-26


JTM9293B	PWM	2.7V-6.0V	37V	0.3V	900mA	90%	0.28mA	0.9MHz	PWM	100Hz-200KHz	SOT-26
JTM9293C	PWM	2.5V-6.0V	36V	0.3V	2A	90%	0.4mA	1MHz	PWM	100Hz-200KHz	SOT-26
JTM9284A/B/C	PWM	2.5V-6.0V	28V	0.1V/	1.5A	90%	0.1uA	1.2MHz	PWM	20KHz-1MHz	SOT-26
				0.25V/
				0.3V

JTM5663	PWM	3V-25V	28V	0.2V	2A	90%	1uA	1.2MHz	PWM	20KHz-1MHz	SOT-26



JTM5663B	PWM	2.7V-6.5V	22V	0.2V	2.8A	95%	5uA	1MHz	PWM		SOT-26




同步升压白灯背光驱动IC

型号	工作模式	工作电	过压保	反馈	开关电	效率	静态	工作	调光	调光频	封装
		压范围	护电压	电压	流限制		电流	频率	形式	率范围
JTM3019	PWM	2.7V-16V	36V	0.2V	340mA	81%	3.2uA	1.2MHz	PWM		SOT-26

我司的JTM5665/SOT-26有以下优点：

1.最大700mA输出电流，带载能力强,输出电流大.
2.反馈电压0.25V.
3.带OVP功能,最高升压17V.
4.输入电压2.2-6.0V,启动电压低.
5.可实现PWM调光.
6.工作频率可达1.4Mhz,纹波小，噪声低，对外界干扰小.
7.可实现3串13并/5串9并和单路串5灯的白灯背光应用,可应用于10-12寸屏以内的白灯背光应用.
8.封装采用金线，全测产品，一致性好，品质稳定.