CXLE87121是一款电流调节电荷泵，用于为照相机闪光灯应用提供高亮度LED。充电泵可设置为调节闪光灯和手电筒模式的两个电流水平。
CXLE87121在升压和降压之间自动切换模式，确保LED电流不依赖于正向电压。它的开关频率为2.2兆赫，允许使用微型元件。电源电压范围从2.7伏到5.5伏，非常适合由一个锂离子电池或三到四个镍镉、镍氢或碱性电池供电的所有应用。
CXLE87121还具有非常低的关断电流、限制浪涌电流的自动软启动模式以及过电流、过电压和过温度热关断控制。
低电流感测参考电压（47mV）允许使用小的0603电流感测电阻器。
•输出电流高达500毫安
•火炬模式下效率高达90%
•可调闪光模式电流
•自动降压/升压模式切换
•输入电压范围：2.7V至5.5V
•最小外部组件：无感应器
•高频运行：2.2兆赫
•低损耗传感用低47mV参考电压
•停机时IQ<1μa
停机时<1μa
•自动软启动限制涌入电流
•低输入和输出纹波和低EMI
•输出过压保护
•过流和过温保护
[ CXLE87121 ]
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产品概述 返回TOP
The CXLE87121 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It switches at 2.2MHz, allowing the use of tiny components. The supply voltage ranges from 2.7V to 5.5V and is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or Alkaline battery cells.
The CXLE87121 also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as over-current, over-voltage and over-temperature thermal shutdown control.
A low current-sense reference voltage (47mV) allows the use of small 0603 current sensing resistors.
The CXLE87121 is available in Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40℃ to +85℃.
产品特点 返回TOP
• Output Current Up to 500mA
• Up to 90% Efficiency in Torch Mode
• Adjustable Flash Mode Current
• Automatic Buck/Boost Mode Switchover
• Input Voltage Range: 2.7V to 5.5V
• Minimum External Components: No Inductors
• High Frequency Operation: 2.2MHz
• Low 47mV Reference for Low Loss Sensing
• IQ < 1μa in shutdown
< 1μa in shutdown
• Automatic Soft-Start Limits Inrush Current
• Low Input and Output Ripple and Low EMI
• Output Over-Voltage Protection
• Over-Current and Over-Temperature Protection
• Available in Green TDFN-3×3-10L Package
应用范围 返回TOP
White LED Torch, Flash for Cell
Phones, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications
General Purpose High Current Boost
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产品封装图 返回TOP
电路原理图 返回TOP
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LED闪光灯驱动器 |
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Part Number |
CH |
VIN(Min) (V) |
VIN(Max) (V) |
Output Current(mA) |
SHDN Iq (μA) |
Frequency (MHz) |
Package |
|
1 |
2.7 |
5.5 |
500 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
500 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
700 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
700 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
1 |
2.7 |
5.5 |
200 |
1 |
1.2 |
TDFN-2x2-6L |
|
|
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