EUP2468-带I2C兼容接口的双通道1.5A同步升压型LED闪光灯驱动器  DataSheet
概述
EUP2468是一款固定2MHz或者4MHz频率的电流模同步升压型转换器。该芯片可以给闪光灯LED应用提供最大1.5A的恒定电流驱动。
配备行业标准的I2C串行数字输入接口，用于启用、禁用和设置LED闪光灯的电流。EUP2468有四个逻辑输入控制端，分别为硬件闪光灯使能（STROBE）、闪光灯中断（TX）、Torch使能信号（TORCH/TEMP）、芯片使能信号（HWEN）。在闪光模式下，LED电流源可以提供从21.8mA到1.5A不等的目标电流。并且在常亮模式下，可编程电流的范围也可以在1.954mA到358mA的范围内变化。
过压保护功能保证输出电压低于LED开路情况下的过压门限。当输出短路到地时，输出短路保护功能可以限制输出电流。NTC功能会根据温度升高限制输出电流。
EUP2468采用12个引脚的小型封装。（Small 12-bump WSCP package）
特点
‧2.5V~5.5V的输入电压范围
‧转换效率高达85%
‧2MHz或者4 MHz的固定开关频率
‧I2C兼容接口
- 400kHz的串行传输速率
- 选择闪光/常亮/IR/待机等状态
- 编程调控闪光LED电流，电流范围从21.8mA到1.5A
- 编程调控常亮LED电流，电流范围从1.954mA到358mA
- 编程调控闪光超时计时器
- 编程调控电流斜率计时器
- 编程调控输入电压闪存监视器（IVFM）
‧真正的负载断开
‧输入电流限制
‧输出过压和短路、过温保护电路
‧NTC监测功能
‧12-Bump WCSP
‧符合RoHS标准，百分百无铅、无卤族元素
应用
‧LED闪光灯
‧智能手机
‧平板电脑
EUP2468-1.5A Synchronous Boost LED Flash Driver with I2C Compatible Interface
Description
The EUP2468 is a 2MHz or 4MHz fixed frequency, current mode synchronous boost converter with two current sources. The device is designed to operate 1.5A constant current driver for single channel.
An industry-standard I2C serial digital input is used to enable, disable and set the current for flash LED. The EUP2468 has four logic inputs including a hardware Flash Enable (STROBE), a Flash Interrupt input (TX), a hardware Torch Enable (TORCH/TEMP), Acitve High Enable (HWEN). In flash mode, the LED current source provides target current levels from 21.8mA to 1.5A. And also in torch mode, the programmable current ranges from 1.954mA to 358mA.
The EUP2468 contains serveral protect functions in abnormal conditions such as: Overvltage Protection, Current Limit, NTC Monitoring Protection, Undervoltage Lockout Protection, Thermal Shutdown Protection and LED/OUT short Protection. Built-in circuitry prevents excessive inrush current during start-up. The chip’s quiescent current is less than 1.0μA in shutdown mode.
EUP2468 is available in a small 12-bump WCSP package.
Feature
‧2.5V to 5.5V Input Supply Range
‧Up to 85% Efficiency
‧2MHz or 4MHz Fixed Switching Frequency
‧I2C-Compatible Interface
- 400-kHz Serial Transfer Rate
- Flash/Torch/IR/Standby
- Programmable Flash LED Current from 21.8mA to 1.5A
- Programmable Torch LED Current from 1.954mA to 358mA
- Programmable Flash Time-Out Timer
- Programmable Current Ramp Timer
- Programmable Input Voltage Flash Monitor (IVFM)
‧True Load Disconnect
‧Input Current Limit
‧Output Over-Voltage, Short Circuit and
Over-Temperature Protection
‧NTC Monitoring
‧0.4mm Pitch, 12-Bump WCSP
‧RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free
Application
‧LED Photo Flash/Movie
‧Smart phone
‧Tablets
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