产品概述 返回TOPbGk嘉泰姆
CXLE88126是一款固定2MHz或者4MHz频率的电流模同步升压型转换器。该芯片可以给两个通道的闪光灯LED应用分别提供恒定电流驱动，单通道电流最大可以提供1.5A。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。CXLE88126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10.9mA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0.977mA到179mA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。CXLE88126采用12个引脚的小型封装。（Small 12-bump WSCP package）The CXLE88126 is a 2MHz or 4MHz fixed frequency,
current mode synchronous boost converter with two
current sources. The device is designed to operate up to
1.5A constant current.
An industry-standard I2C serial digital input is used to
enable, disable and set the current for flash LED. The
CXLE88126 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 128 target current levels from 10.9mA to 1.5A.
The total LED current of ECXLE88126can deliver is 1.5A
(ILED1+ILED2). The dual 128 level current sources provide
the flexibility to adjust the current ratios between LED1
and LED2 (ex: ILED1=1.5A and ILED2=OFF, ILED1=OFF
and ILED2=1.5A, or a current configuration with a current
less than 1.5A, ILED1=700mA and ILED2=300mA). And
also in torch mode, the programmable current ranges
from 0.977mA to 179mA by 128 steps.
An over voltage protection feature keeps the output
voltage below the OVP threshold in the case of an open
LED and an output short circuit protection limits the
output current during an output short to GND. NTC
function is designed for temperature sensing and current
scale back.
ECXLE88126is available in a small 12-bump WCSP
package.
产品特点 返回TOPbGk嘉泰姆
bGk嘉泰姆
‧2.5V~5.5V的输入电压范围</p>
‧转换效率高达85%bGk嘉泰姆
‧2MHz或者4 MHz的固定开关频率</p>
‧I2C兼容接口bGk嘉泰姆
- 400kHz的串行传输速率bGk嘉泰姆
- 选择闪光/常亮/IR/待机等状态</p>
- 编程调控闪光LED电流，电流范围从10.9mA到1.5AbGk嘉泰姆
- 编程调控常亮LED电流，电流范围从0.977mA到179mAbGk嘉泰姆
- 编程调控闪光超时计时器</p>
- 编程调控电流斜率计时器</p>
- 编程调控输入电压闪存监视器（IVFM）</p>
‧真正的负载断开bGk嘉泰姆
‧输入电流限制bGk嘉泰姆
‧输出过压和短路、过温保护电路</p>
‧NTC监测功能bGk嘉泰姆
‧12-Bump WCSPbGk嘉泰姆
‧符合RoHS标准，百分百无铅、无卤族元素bGk嘉泰姆
2.5V to 5.5V Input Supply RangebGk嘉泰姆
1.5A Total Allowed LED Current During OperationbGk嘉泰姆
(ILED1+ILED2=1.5A)bGk嘉泰姆
Up to 85% EfficiencybGk嘉泰姆
2MHz or 4MHz Fixed Switching FrequencybGk嘉泰姆
I2C-Compatible InterfacebGk嘉泰姆
- 400-kHz Serial Transfer RatebGk嘉泰姆
- Flash/Torch/IR/StandbybGk嘉泰姆
- Programmable Flash LED Current from 10.9mA tobGk嘉泰姆
1.5AbGk嘉泰姆
- Programmable Torch LED Current from 0.977mAbGk嘉泰姆
to 179mAbGk嘉泰姆
- Programmable Flash Time-Out TimerbGk嘉泰姆
- Programmable Current Ramp TimerbGk嘉泰姆
- Programmable Input Voltage Flash MonitorbGk嘉泰姆
(IVFM)bGk嘉泰姆
True Load DisconnectbGk嘉泰姆
Input Current LimitbGk嘉泰姆
Output Over-Voltage, Short Circuit andbGk嘉泰姆
Over-Temperature ProtectionbGk嘉泰姆
NTC MonitoringbGk嘉泰姆
0.4mm Pitch, 12-Bump WCSPbGk嘉泰姆
RoHS Compliant and 100% Lead(Pb)-FreebGk嘉泰姆
Halogen-FreebGk嘉泰姆
应用范围 返回TOPbGk嘉泰姆
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‧LED闪光灯</p>
‧智能手机bGk嘉泰姆
‧平板电脑bGk嘉泰姆
LED Photo Flash/MoviebGk嘉泰姆
Smart phonebGk嘉泰姆
TabletsbGk嘉泰姆
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