RT9363AGQW Richtek

RT9363A 3 Channels 90mA x1/x2 Charge Pump White LED Driver General Description Features zz z zz Over 80% Average Efficiency Over Battery Life The RT9363A is a compact, high efficient and highly zz z zz Support Up to 3 White LEDs integrated charge pump white LED driver. It maintains the zz z zz 80mV Typical Current Source Dropout highest efficiency by utilizing a x1/x2 fractional charge zz z zz Support Up to 90mA Output Current pump and low dropout current regulators. The RT9363A zz z zz 1% Typical LED Current Accuracy supports up to 3 white LEDs and regulates a constant zz z zz 0.7% Typical LED Current Matching current for uniform intensity. The part implements a 4-bit zz z zz Soft Start Function DAC for brightness control. Users can select external R SET zz z zz Automatic Charge Pump Mode Selection or internal R by ISET pin. The dimming of white LEDs SET zz z zz 1MHz Random Frequency Oscillator current can be achieved by applying a pulse signal to the zz z zz Over Voltage Protection EN pin. There are totally 16 steps of current could be set zz z zz 16-Step Brightness Control by users. The part can support 15mA to 30mA for the 100% zz z zz Low Input Noise and EMI current setting. Users also can use the internal R for SET zz z zz Low 1uA Shutdown Current 100% current setting of 20mA just by connecting the ISET zz z zz Flexible Current Setting pin to V . The operating voltage range is from 2.8V to IN zz z zz RoHS Compliant and 100% Lead (Pb)-Free 5.5V. Internal soft start circuitry effectively reduces the in- rush current while both start-up and mode transition. The load is disconnected from V while shutdown and the IN Applications shutdown current is less than 1uA. z Mobile Phone, DSC, MP3 z White LED Backlighting RT9363A is available in a WDFN -10L 3x3 package. z LCD Display Supply Ordering Information RT9363A Pin Configurations Package Type (TOP VIEW) QW : WDFN-10L 3x3 (W-Type) Lead Plating System LED3 1 10 EN 2 9 ISET LED2 P : Pb Free GND 3 8 LED1 VOUT G : Green (Halogen Free and Pb Free) 4 7 CN VIN 11 CP 5 GND Note : Richtek products are : WDFN-10L 3x3 RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. DS9363A-03 April 2011 www.richtek.com 1 9RT9363A Typical Application Circuit Li-ion 4 Battery CN 7 C FLY VIN 1uF RT9363A CP 5 C + IN 9 ISET 2.2uF 3 LED1 2 LED2 10 GPIO EN 1 LED3 6 8 GND VOUT C OUT 2.2uF Figure 1. Internal R = 20mA, for 3-WLEDs Application Circuit SET(MAX) Li-ion 4 Battery 7 CN C VIN FLY 1uF 5 RT9363A CP C + IN 9 ISET 2.2uF 3 LED1 2 LED2 10 EN GPIO 1 LED3 6 8 GND VOUT C OUT 2.2uF Figure 2. Internal R = 20mA, for 2-WLEDs Application Circuit SET(MAX) Li-ion 4 Battery 7 CN C VIN FLY 1uF RT9363A CP 5 C + IN R SET 9 ISET 2.2uF 3 LED1 2 LED2 10 1 EN GPIO LED3 6 8 GND VOUT C OUT 2.2uF Figure 3. External R = 15 to 30mA, for 3-WLEDs Application Circuit SET(MAX) Li-ion 4 Battery CN 7 C FLY VIN 1uF RT9363A CP 5 C IN + R SET 9 ISET 2.2uF 3 LED1 2 LED2 10 1 EN GPIO LED3 6 8 GND VOUT C OUT 2.2uF Figure 4. External R = 15 to 30mA, for 2-WLEDs Application Circuit SET(MAX) www.richtek.com DS9363A-03 April 2011 2