XXRRPP77662200 4-Channel Adjustable Current I2C Controlled LED Driver 4-Channel Adjustable Current I2C Controlled LED Driver June 2012 Rev. 1.1.0 GENERAL DESCRIPTION APPLICATIONS The XRP7620 is a multi purpose 4-channel LCD Display & Keypad Backlighting independently adjustable current sink driver. Color Coded Indicator Lighting Optimized for LED backlighting and RGBW/RGBA Color Mixing RGBW/RGBA color mixing applications, the XRP7620 can also be used as a generic Cell Phones & Handheld Devices software programmable current sink I/O expander. Generic Current Sink I/O Expander 2 Supporting an industry standard 2-wire I C serial interface, the XRP7620 provides full FEATURES independent control of each channel and can 4-Channel LED Current Sink Driver be programmed up to a current of 31.5mA in steps of 0.5mA. Uniform display brightness is Individual Channel Current Control ensured through better than 3% channel to Up to 31.5mA per channel / 0.5mA Steps channel current matching. 100mV Channel Dropout Voltage Five internal registers are provided to set 2 I C Serial Interface operational configuration and individual channel current programmation. A specific 2.7V - 5.5V Input Voltage Range shutdown mode allows the device to retain the 3% Channel Current Matching previously loaded configuration operational and current programming in order to be Register Retention in Shutdown reused upon the next enabling. Shutdown Current <1A The XRP7620 is designed to operate from a Thermal and UVLO Built-in Protection single cell lithium-ion battery or fixed 3.3V or 5.0V power rails and is available in a RoHS RoHS Compliant, Green/Halogen compliant, green/halogen free space saving Free 2x3mm 8-Pin DFN package 8-pin 2mmx3mm DFN package. TYPICAL APPLICATION DIAGRAM Fig. 1: XRP7620 Application Diagram Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 XXRRPP77662200 4-Channel Adjustable Current I2C Controlled LED Driver 4-Channel Adjustable Current I2C Controlled LED Driver ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Input Voltage Range V ............................... 2.7V to 5.5V IN the device at these ratings or any other above those Junction Temperature Range ....................-40C to 100C indicated in the operation sections of the specifications Thermal Resistance ...................................... 59C/W JA below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V , SDA, SCL, LEDx .................................. -0.3V to 6.0V IN Storage Temperature .............................. -65C to 150C Power Dissipation ................... Internally Limited (Note 1) Lead Temperature (Soldering, 10 sec).................... 300C ESD Rating (Human Body Model).............................. 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of T = 25C only limits applying over the full J Operating Junction Temperature range are denoted by a . Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T = 25C, and are provided for J reference purposes only. Unless otherwise indicated, V = 2.7V to 4.6V, C = 1F, T = 40C to 85C, T = 40C to IN IN A J 100C. Parameter Min. Typ. Max. Units Conditions Operating Input Voltage Range 2.7 5.5 V Operating Input Current 30 50 A I =0, V =4.2V LEDX IN DAC=000000 Operating Input Current 450 600 A I =I =I =I =10mA, V =4.2V LED1 LED2 LED3 LED4 IN V = 0.2V to 2.7V LED -0.3 0.3 mA I 6mA LEDX LED Current accuracy (includes Line Regulation) -5 5 % V = 0.2V to 2.7V LED I > 6mA -8 8 % LEDX For same DAC setting LED Current Matching -3 3 % V = 0.2V to 2.7V, Note 2 LED Measured as I /I /V OUT OUT AVG Line Regulation 1 %/V V = 0.2V to 2.7V, Note 3 LED Current DAC Resolution 6 Bit Current for DAC=000000 2 A Applies to all LEDs Current for DAC=000001 0.35 0.50 0.65 mA Applies to all LEDs Maximum LED Current 30.50 31.75 33.00 mA Applies to all LEDs DAC=111111 For changes between any DAC code 000001 and higher. Current must change 2 s within this time after the last bit of LED data. V =2.7 to 5.5V IN Maximum Current Change Applies to changes between DAC code Settling Time 000000 and higher or change from 0 to 1 for STATUS bits B5-B2 (channel enable). 60 150 s Current must change within this time after the last bit of LED data. V =2.7 to IN 5.5V I =20mA LED The voltage where LED current decreases Current Source Dropout Voltage 0.1 0.15 V 3% from nominal value at V = 1V. LED V =2.7 to 5.5V IN Shutdown Supply Current 0.01 1 A V =4.2V IN Shutdown Supply Current 5 A V =4.2V, T =85C IN A Thermal Shutdown Die 125 150 175 C Regulator turns off Temperature 2012 Exar Corporation 2/11 Rev. 1.1.0