MP1519DQ-LF-P Monolithic Power Systems

TM MP1519 1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver TM The Future of Analog IC Technology DESCRIPTION FEATURES The MP1519 is a fully automatic driver for 2% LED Current Matching powering four white LEDs, with up to 4V High Efficiency (>93%) forward voltage, from a single Li-Ion or three Current Source Outputs NiMH cells. The driver performs all of the No Ballast Resistors Required sensing and control to run the LEDs at an 1x, 1.5x and 2x Automatic Modes optimum charge pump ratio for efficiency Constant Frequency Operation without an expensive inductor. The driver Automatic LED Detection allows PWM operation to support brightness High and Low Frequency PWM Capability control. 2.5V to 5.5V Operation The tiny 3mm x 3mm QFN16 package and Less than 1A Leakage during Shutdown small external capacitors allow for the most Detects Changes in Battery Level compact white LED solution available. No External Schottky Diode Required Soft-Start and Soft Switching Operation EVALUATION BOARD REFERENCE Board Number Dimensions APPLICATIONS EV0042 2.4X x 1.9Y x 0.4Z Cell Phones PDA or Hand Held Computers White LED Application at 3.6V Supply MPS and The Future of Analog IC Technology are Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP1519 Efficiency vs 5, 13 4 BATT C1A BATT Supply Voltage V = 3.35V 20mA LED 12 7 100 ENABLE EN C1B I =5mA LED I =20mA LED 90 11 6 80 RADJ C2A 70 3, 10 9 60 GND GND C2B 50 14 LED1 40 I =10mA LED 15 30 LED2 20 8 16 LED3 LEDC 10 0 1 LED4 2.5 3.0 3.5 4.0 4.5 LED4 LED3 LED2 LED1 SUPPLY VOLTAGE (V) MP1519 Rev. 1.9 www.MonolithicPower.com 1 10/8/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved. EFFICIENCY (%)TM MP1519 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER (1) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS V to GND .............................................. 6.5V BATT TOP VIEW PIN 1 ID Power Dissipation (QFN)........................... 1.0W LED3 LED2 LED1 BATT Logic Inputs to GND ...................0.3V to +6.5V 16 15 14 13 Storage Temperature ..............65 C to +150 C LED4 1 12 EN Junction Temperature...............................150C NC 2 11 RADJ (2) Recommended Operating Conditions GND 3 10 GND Input Voltage VBATT...................... 2.5V to 5.5V Operating Temperature .............40 C to +85 C C1A 4 9 C2B (3) 5 6 7 8 Thermal Resistance JA JC BATT C2A C1B LEDC 3x3 QFN16 ............................. 60...... 14... C/W EXPOSED PAD CONNECT TO PIN 8 Notes: 1) Exceeding these ratings may damage the device. Part Number* Package Temperature 2) The device is not guaranteed to function outside of its QFN16 operating conditions. MP1519DQ 40 C to +85C 3) Measured on approximately 1 square of 1 oz copper. (3mm x 3mm) For Tape & Reel, add suffix Z (eg. MP1519DQZ) * For RoHS Compliant Packaging, add suffix LF (eg. MP1519DQLFZ) ELECTRICAL CHARACTERISTICS V = 5V, T = +25 C, unless otherwise noted. BATT A Parameter Symbol Condition Min Typ MaxUnits Input Supply Voltage V 2.5 5.5 V BATT I = 20mA, V Decreasing, LED BATT V at 1x to 1.5x Mode Switch V 3.6 V BATT BATT 1x-1.5x V = 3.35V 20mA LED I = 20mA, V Decreasing, LED BATT V at 1.5x to 2x Mode Switch V 2.8 V BATT BATT 1.5x-2x V = 3.35V 20mA LED V Increasing, BATT V at 2x to 1.5x Mode Switch V 3.1 V BATT BATT 2x-1.5x V = 3.35V 20mA LED V Increasing, BATT V at 1.5x to 1x Mode Switch V 3.8 V BATT BATT 1.5x-1x V = 3.35V 20mA LED 4 LEDs at 20mA, 2x Mode, Supply Current I 164 180 mA BATT V = 2.5V BATT Supply Current Shutdown I V = 0V 0.1 1 A BATT SHDN EN (4) Current Matching I I = 20mA 1.5 5.0 % LED MATCH LED Enable Voltage, High V 2.0 2.2 V EN (HIGH) Enable Voltage, Low V 0.8 1.0 V EN (LOW) Enable Pin Leakage I V = 5V 0.1 1 A EN EN Charge Pump Frequency F V = 3.3V 1.0 1.3 1.6 MHz CP BATT (5) Time to Standby Mode T Enable Switched Low 30 s OFF Enable Pin PWM Frequency Limit F 50 KHz HPWM LED Current I R = 1.54k 18 20 22 mA LED SET Notes: 4) Matching is defined as the difference of the maximum to minimum current divided by the sum of the maximum and minimum currents. 5) Standby mode switches to shutdown when the output voltage on LEDC drifts back to GND. MP1519 Rev. 1.9 www.MonolithicPower.com 2 10/8/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved.