SP7121EK-F

S P7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver January 2010 Rev. 2.0.0 GENERAL DESCRIPTION APPLICATIONS The SP7121 LED driver provides a simple solution for a matched current source for any color common cathode LEDs. The common cathode connection allows the user to increase the LED power dissipation by having the cathodes heat sinked to the ground plane of the circuit board. The SP7121 output current value is set by an external resistor. At shutdown mode (EN pin is LOW), the supply current drops to .04μA typical. The SP7121 is available in a small footprint RoHS compliant, lead-free and green/halogen free 6-pin SOT23 packages. • Mobile Phones • PDA, DSC, MP3 Players • Handheld Computers • Keypads and Displays Backlight FEATURES • LED Driver for Common Cathode Parallel Connected LEDs • Ultra Low Dropout Voltage of 300mV @ 25mA • No EMI, no Switching Noise • Integrated Current Matching • PWM Brightness Control • Enable/Shutdown Control • Shutdown Current < 1μA • Adjustable Output Current up to 30mA per Channel • RoHS Compliant, Lead Free and Halogen Free SOT23-6 Packages TYPICAL APPLICATION DIAGRAM Fig. 1: SP7121 Application Diagram Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 S P7121 2-Channel Adjustable Low Dropout High Side Linear LED Driver ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VIN ............................... 2.7V to 5.5V Operating Temperature Range ................... -40°C to 85°C Thermal Resistance θJA .....................................190°C/W VCC, VLED1, VLED2,EN to GND .......................... -0.3V to 6.0V LED Current ILED1, ILED2 .......................................... 30mA Storage Temperature .............................. -65°C to 150°C Junction Temperature .......................................... 150°C Lead Temperature (Soldering, 10 sec) ................... 300°C ESD Rating (HBM) Enable and ISET pins .................. 1.5kV ESD Rating (HBM) All other pins ............................. 2.0kV ESD Rating (MM - Machine Model) ...........................200V ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of TA = 25°C only; limits applying over the full Operating Ambient 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 TA = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VCC = 2.7V to 5.5V, ENABLE = VCC, ILED = 15mA. Parameter VCC Min. Typ. Max. Units Conditions 5.5 V Shutdown Current 0.04 1 µA EN=Low VLED Dropout Voltage , VD1 135 200 mV VCC=5.5V, ILED=20mA 0.2 1 % 0.3 %/V 0.3 mA/V VCC=3.7V, 150mV