CXUS65172电荷泵驱动多达四个具有恒定电流的白色LED，以获得均匀的强度。利用动态1x/2x电荷泵模式和超低漏电流调节器，在单电池锂电池输入电压范围内实现高效率。250kHz的固定频率开关允许微小的外部组件，并且优化了调节方案以确保低EMI和低输入纹波。CXUS65172使用一个单线EN/亮度控制来启用、禁用和设置LED电流，16个线性阶梯降到100μa。一旦设置了所需的LED亮度，只要EN引脚保持高，CXUS65172就保持恒定的LED电流。如果EN引脚保持低90μs，则CXUS65172进入关机状态。还包括短路、过电压和热保护。启动软启动以减少通电和泵模式转换期间的涌入电流
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产品概述 返回TOP
The CXUS65172 charge pump drives up to four white LEDs with regulated constant current for uniform intensity. By utilizing dynamic 1x/2x charge-pump modes and ultra-low-dropout current regulators, it achieves high efficiency over the 1-cell lithium battery input voltage range. The 250kHz fixed frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple. The CXUS65172 uses a single wire EN/Brightness control to enable, disable, and set the LED current with 16-linear steps down to 100μA. Once the desired LED brightness is set, the CXUS65172 maintains constant LED current as long as EN pin is kept high. If EN pin kept low for 90μs, the CXUS65172 enters shutdown. The short-circuit, over-voltage, and thermal protection are also included. The soft start is enabled to reduce the inrush current during power on and pump mode transformed.
产品特点 返回TOP
Dynamic 1x/2x Charge Pump Switching
„ Up to 80mA (20mA/LED) Drive Capability
„ 90% Average Efficiency
„ 0.5% (TYP) LED Current Matching
„ Wide Current Range per LED [0.1mA ~ 20mA]
„ Single Wire EN/Brightness Control
„ 2.7V to 5.5V Supply Voltage Range
„ < 1μA Shutdown Current
„ Output Over-voltage Protection
„ Open/Short LED Protection
„ Thermal Shutdown Protection
„ TDFN2.5X2.5-10 and TQFN3X3-16 Package
应用范围 返回TOP
„ Mobile Phones
„ White LED Backlighting
„ Camera Flash LED Lighting
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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