Four Channel High Efficiency White LED Driver 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

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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.

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Dynamic 1x/2x Charge Pump Switching r2P嘉泰姆

„ Up to 80mA (20mA/LED) Drive Capability r2P嘉泰姆

„ 90% Average Efficiency r2P嘉泰姆

„ 0.5% (TYP) LED Current Matching r2P嘉泰姆

„ Wide Current Range per LED [0.1mA ~ 20mA] r2P嘉泰姆

„ Single Wire EN/Brightness Control r2P嘉泰姆

„ 2.7V to 5.5V Supply Voltage Range r2P嘉泰姆

„ < 1μA Shutdown Current r2P嘉泰姆

„ Output Over-voltage Protection r2P嘉泰姆

„ Open/Short LED Protection r2P嘉泰姆

„ Thermal Shutdown Protection r2P嘉泰姆

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„ Mobile Phones r2P嘉泰姆

„ White LED Backlighting r2P嘉泰姆

„ Camera Flash LED Lightingr2P嘉泰姆

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