CXUS65171是一款用于照相机闪光灯应用的大电流白光LED驱动的电荷泵。与电感式DC-DC调节器相比，双桶形电容器的结构用于降低输出纹波，并提供低EMI解决方案。CXUS65171具有独立的闪存/火炬/关闭模式。CXUS65171能够在闪光模式下输出500毫安的稳定电流，持续时间大于500毫秒。当驱动700毫安的输出电流时，CXUS65171的超温保护限制了缩短的持续时间。在这种模式下有一个1秒的安全计时器，以避免过热导致LED损坏。CXUS65171可以在火炬模式下连续输出20%的闪光模式电流。闪光模式优先于火炬模式。一个电阻连接到ISET引脚，与LED串联，用来设置电流。闪光和火炬模式下的ISET电压分别为250 mV和50 mV。GCXUS65171提供10针3x3mm TDFN微型封装。
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产品概述 返回TOP
The CXUS65171 is a charge pump for high-current white LED driving used in camera flash applications. The architecture of two bucket capacitors is used to decrease the output ripple and provides low EMI solution compared to inductive DC-DC regulators. The CXUS65171 has independent flash/torch/shutdown modes. The CXUS65171 is capable to output 500mA of regulated current in flash mode for the duration greater than 500ms. While driving 700mA output current, the reduced duration is limit by CXUS65171’s over-temperature protection. There is a one second safety timer in this mode to avoid LED damage caused by overheat. The CXUS65171 can outputs 20% of flash mode current continuously in torch mode. The flash mode has priority over the torch mode. A resistor connected to ISET pin, which is in series with the LED, is to set the current. The ISET voltage is 250mV and 50mV in flash and torch mode respectively. The GCXUS65171is available in tiny 10-pin 3x3mm TDFN package.
产品特点 返回TOP
„ Independent flash/torch/shutdown modes
„ Up to 700mA drive current
„ Flash timeout protection
„ Torch mode set to 20% of flash current
„ 1X/2X mode for torch mode to maximize efficiency
„ Wide input voltage range from 3V to 5.5V
„<1μA shutdown current
„ Input/Output over-voltage protection
„ Short-circuit protection
„ Over-temperature protection
„ Tiny TDFN3X3-10 package
应用范围 返回TOP
„ Cellular camera phone
„ Digital still camera
„ PDA camera
„ Camcorder torch lamp
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Charge Pump and Current Source |
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Part NO. |
Vin(V) min. |
Vin(V) max. |
IOUT (mA) |
FOSC (kHz) |
VOUT (V) |
LED Number |
Eff. (%) |
Note |
Package |
|
3 |
5.5 |
600 |
250 |
1x/2x |
1 |
-- |
Flash LEDdriver,Flash/Torch/SHDN |
TDFN3X3-10 |
|
|
2.7 |
5.5 |
80 |
250 |
1x/2x |
4 |
90 |
4-CH LED in Parallel,PWM control16 levels dimming control |
TDFN2.5X2.5-10 TQFN3X3-16 |
|
|
2.7 |
5 |
90 |
1000 |
4.5/5 |
-- |
88 |
EN,GND,VOUT,C+,VIN,C-,Boost |
TSOT-23-6/TDFN2X2-6 |
|
|
1.8 |
5 |
60 |
270 |
-VIN |
-- |
90 |
IN,EN,GND,C-,C+,OUT,Inverting |
SOT-23-6/TDFN2X2-6 |
|
|
1.8 |
5 |
60 |
270 |
-VIN |
-- |
90 |
NC,CP+,GND,CP-,OUT,NC,NC,IN |
SOP-8 |
|
|
8 |
24 |
10 |
350 |
1.5x |
-- |
-- |
PG,D_CAP |
MSOP-8 |
|
|
8 |
24 |
10 |
370 |
1.5x |
-- |
-- |
PG,D_CAP,12V,ONx,DRIVERx |
TQFN3X3-20 |
|
|
4.5 |
5.5 |
14 |
-- |
2x |
-- |
-- |
2-NMOSFET driver,20mA discharging |
TQFN3X3-20 |
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