RT9365GQW

The RT9365GQW from Richtek is a 100mA 5-channel charge pump white LED driver with low dropout current source in 16 pin WQFN package. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing an x1/x1.5 fractional charge pump and low dropout current sources. The small equivalent x1 mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of x1 mode and optimize the efficiency of Li-ion battery in white LED applications. It supports up to 5 white LEDs and regulates a constant current for uniform intensity. The part implements a 4bit DAC for brightness control. Users can easily configure the LED current from 1.25mA to 20mA by a serial pulse. It is used in white LED backlighting, LCD display supply and mobile phone, DSC, MP3.

• Input supply voltage range from 2.8V to 5V
• 85% average efficiency over battery life, 80mV typical current source dropout
• Support up to 100mA output current, 1% typ LED current accuracy, 0.7% typ LED current matching
• Soft start function, auto charge pump mode selection
• 250KHz fixed frequency oscillator, output over voltage protection, 16-step brightness control
• Low input noise and EMI, low 0.3μA shutdown current
• Shutdown current of 7µA, 200mV mode transition hysteresis
• EN low time for shut down is 3ms, oscillator frequency range from 250KHz
• Operating temperature range from -40°C to 85°C
• Over voltage protection of 5.5V

Applications

LED Lighting, Consumer Electronics, Portable Devices

Warnings

Devices is ESD sensitive handling precaution is recommended.