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Technical content

Features

„ 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

Applications

„ Mobile Phones „ White LED Backlighting „ Camera Flash LED Lighting General Description The G5904 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 G5904 uses a single wire EN/Brightness control to enable, disable, and set the LED current with 16-linear steps down to 100 µA. Once the desired LED brightness is set, the G5904 maintains constant LED current as long as EN pin is kept high. If EN pin kept low for 90 µs, the G5904 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.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5904RM1U 5904 -40 °C~ +85°C TDFN2.5X2.5-10 G5904R41U 5904 -40 °C~ +85°C TQFN3X3-16 Note: RM: TDFN2.5X2.5-10 R4: TQFN3X3-16 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5904 TQFN3X3-16 N.C. N.C. N.C. VIN GND1 EN 12 C1P C1N N.C. LED2 LED1 8N.C. N.C. VOUT Thermal Pad LED3 LED4 VOUT EN VIN LED1 GND 1µF C1N C1P COUT 1µF LED2 LED3 LED4 Battery CIN 1µF High Low TDFN2.5X2.5-10 G5904 3 8 Thermal PadGND C1N C1P EN VIN LED4 VOUT LED2 LED3 LED1 G5904 TQFN3X3-16 N.C. N.C. N.C. VIN GND1 EN 12 C1P C1N N.C. LED2 LED1 8N.C. N.C. VOUT Thermal Pad LED3 LED4 VOUT EN VIN LED1 GND 1µF C1N C1P COUT 1µF LED2 LED3 LED4 Battery CIN 1µF High Low TDFN2.5X2.5-10 G5904 3 8 Thermal PadGND C1N C1P EN VIN LED4 VOUT LED2 LED3 LED1