SP7120/22 2 or 3 Channel Low Dropout High Side Linear LED Driver FEATURES LED Driver for common cathode parallel connected LEDs Ultra Low Dropout Voltage of 150mV No EMI, no switching noise Integrated current matching PWM and Analog brightness control Enable/Shutdown control Shutdown current < 1A Lead Free, RoHS Compliant Package: Small footprint SOT23-6 APPLICATIONS Mobile Phones PDA, DSC, MP3 players Handheld Computers Keypads and display backlight GENERAL DESCRIPTION The SP712X drivers family provides a simple solution for a matched current source for any color common cathode LED configuration. 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 SP7120 may drive two LEDs or one LED at twice the current with two channels connected in parallel. The SP7122 can drive three LEDs or one LED at three times the current. The factory preset current values are 15mA (version A), 20mA (version B), or 25mA (version C) per channel. In shutdown mode (EN pin is LOW), the supply current drops to 40nA typical. The SP712x drivers are available in a small footprint 6-pin SOT23-6 package. APPLICATION SCHEMATIC C1 1nF SP7120 Powering 2 LEDs Jan 7 08 RevE SP7120/22 Low Dropout LED Driver 2007 Sipex Corporation page 1 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation Vcc, V , V , and EN to GND -0.3V to 6V LED1 LED2 of the device at these ratings or any other above Junction Temperature............................+150C o those indicated in the operation sections of the Operating Temperature...........-40 to +85 C specifications below is not implied. Exposure to Storage Temperature...............-65C to +150C absolute maximum rating conditions for extended Package Thermal resistance JA .190C/W period may affect reliability. ESD Level...........................................2kV HBM ESD Level...........................................200V MM ESD Level EN..1.5kV HBM Lead Temperature (Soldering, 10 sec) 300C RECOMMENDED OPERATING CONDITIONS Ambient operating temperature ... -40 to+85C ELECTRICAL CHARACTERISTICS Specifications are at TA=25C, Vcc = 2.7 to 5.5, ENABLE =Vcc Parameter Min Typ Max Units Conditions Vcc 2.7 5.5 V Shutdown Current 0.04 1 A EN = LOW 1 VLED Dropout Voltage, Vd 160 200 mV Vcc = 5.5V, ILED = 20mA 1 VLED Dropout voltage, Vd 140 180 mV Vcc = 5.5V, ILED = 15mA Version A 14 15 16 300mV<VD<1.0V LED Current mA 2 Version B 19 20 21 300mV<VD<1.0V Accuracy Version C 24 25 26 300mV<VD<1.0V Version A 0.5 0.7 SP7120 at VD = 300mV Version B 0.7 1.1 Quiescent Version C 0.86 1.7 mA Current Version A 0.6 0.8 SP7122 at VD = 300mV Version B 0.9 1.2 Version C 0.99 1.9 6 LED to LED Current Matching 0.8 % Vcc = 5.5V, VD > 300mV 3 LED Current Line Regulation .25 %/V 2.7V < Vcc < 5.5V 4 LED Current Load Regulation 1.0 %/mA 300mV < VD < 1.0V 0 LED Current Thermal Regulation 0.01 %/C VD = 300mV 5 EN ON Voltage (HIGH) 2 Vcc V EN OFF Voltage (LOW) 0 0.8 V EN Input Bias Current 2 3 5 VEN = Vcc = 5.5V A EN Switching Frequency 20 kHz EN ON Minimum Pulse Width 15 s 1) Difference between Vcc voltage and LED anode voltage at which ILED current drops 10% from nominal value 2) ILED Current Variations from specified value 3) ILED Current Variations per volt Vcc change for any given temperature 4) ILED Current Variations at VD change from 0.3V to 1.0V 5) EN input voltage should not exceed Vcc voltage at any condition 6) This condition is part of the LED current accuracy and it shall not exceed that specification Jan 7 08 RevE SP7120/22 Low Dropout LED Driver 2007 Sipex Corporation page 2