The JTM5666B is a high efficiency step-up converter with an

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

一,产品概述(General Description)
     The JTM5666B is a high efficiency step-up converter with an internally integrated 40V power MOSEFT. It runs with an optimal 0.8MHz frequency that enables use of small
external components while still providing best efficiencies. It has an internal current limit as high as 1A, and it can drive up to 10 LEDs at 50mA output current. The incorporated 25-100KHz true PWM-Dimming feature by EN pin can be used to digitally program the LED current. For maximum protection, the JTM5666B has an internal OVP protection at 38V to prevent the chip from damages when the LED string is not connected to the output.
    JTM5666B is available in a space-saving SOT23-6 package.
二.产品特点(Features)

Up to 91% Efficiency (6 LEDs)
Drive up to 10 LEDs with 50mA
Drive up to 40 LEDs in total
38V OVP protection
True PWM Brightness Control
200mV Feedback Voltage
1A current limit
SOT23-6 Package

三,应用范围 (Applications)
Cellphone and Smartphone
MID or Tablet PC
TFT-bias for LCD screen
Power for OLED
LED torch
Satellite Set Top Box

四,产品封装图 (Package)

五,电路原理图

六.产品PDF文档

JTM5666

七,功能概述
The JTM5666B is a high efficiency boost LED driver with a small package size. The device is ideal for driving 2-25LEDs for backlight
application in smartphone and 7-inch tablet PC. The device integrates a 38V/1A switch FET and operates in pulse width
modulation (PWM) with a 0.8MHz fixed switching frequency. For operation details, please check the block diagram in the “Block
Diagram” chapter. The duty cycle of the converter is set by the error amplifier output and the current signal applied to the
PWM control comparator. The feedback loop regulates the FB pin to a low reference voltage (200mV typical), reducing the
power dissipation in the current sense resistor. (责任编辑：oumao18)