MP1528DQ-LF-P Monolithic Power Systems

MP1528 9 Lamp, 36V Precision White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP1528 is a step-up converter designed Drives up to 9 Series White LEDs for driving up to nine (9) series White LEDs Integrated 0.63 Power MOSFET (LED) from a single cell Lithium-Ion battery. It Low 0.4V Full-Scale Current Sense Threshold regulates the LED current and includes an Over 20mA Output Current Capacity analog input for varying the LED brightness. Analog and Digital PWM Brightness Control Open Load Shutdown The MP1528 uses current limited, variable frequency architecture to regulate the LED Soft-Start current while maintaining high efficiency. The Internal Current Limit BIAS pin measures the output voltage and turns Under Voltage Lockout off the converter if an over voltage condition is Thermal Shutdown present to prevent damage due to an open Available in 8-Pin MSOP, 8-pin 2mm x 2mm circuit condition. The LED current is measured QFN and 6-Pin 3mm x 3mm QFN Packages with an external current sense resistor. The low APPLICATIONS 0.4V full-scale regulation threshold and 0.63 power switch minimize power loss. Handheld Computers PDAs The MP1528 is available in an 8-pin MSOP, an PDA Phones 8-pin 2mm x 2mm QFN and a 6-pin 3mm x Digital and Video Cameras 3mm QFN packages. Small LCD Displays EVALUATION BOARD REFERENCE MPS and The Future of Analog IC Technology are Registered Trademarks of Board Number Dimensions Monolithic Power Systems, Inc. EV1528DQ-00A 2.0 x 1.5 x 0.5 TYPICAL APPLICATION Efficiency vs D1 B160B LED Current V IN V = 12V IN 100 6 LEDs 7 LEDs LED1 90 5 3 80 C3 EN SW EN 10nF 8 LEDs 70 MP1528 9 LEDs 60 6 4 LED9 BRT BRT BIAS 50 2 1 GND FB 40 30 0 5 10 15 20 25 30 35 LED CURRENT (mA) MP1528 TAC01 MP1528 EC01 MP1528 Rev. 1.9 www.MonolithicPower.com 1 1/25/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. EFFICIENCY (%)MP1528 9 LAMP, 36V PRECISION WHITE LED DRIVER ORDERING INFORMATION Part Number* Package Top Marking Temperature MP1528DQ QFN6 (3mm x 3mm) A6YW 40 C to +85C Part Number** Package Top Marking Temperature MP1528DK MSOP8 1528D 40 C to +85C Part Number*** Package Top Marking Temperature MP1528DG QFN8 (2mm x 2mm) A6Y 40 C to +85C *For Tape & Reel, add suffix Z (e.g. MP1528DQZ). For RoHS compliant packaging, add suffix LF (e.g. MP1528DQLFZ) **For Tape & Reel, add suffix Z (e.g. MP1528DKZ). For RoHS compliant packaging, add suffix LF (e.g. MP1528DKLFZ) ***For Tape & Reel, add suffix Z (e.g. MP1528DGZ). For RoHS compliant packaging, add suffix LF (e.g. MP1528DGLFZ) PACKAGE REFERENCE TOP VIEW TOP VIEW N/C 1 8 N/C TOP VIEW FB 1 6 BRT FB 2 7 BRT NC 1 8 NC GND 2 5 EN FB 2 7 BRT GND 3 6 EN GND 3 6 EN SW 4 5 BIAS SW 4 5 BIAS SW 3 4 BIAS EXPOSED PAD EXPOSED PAD ON BACKSIDE ON BACKSIDE QFN6 MSOP8 QFN8 (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage V to GND ....................... 42V QFN6 (3mm x 3mm)............... 50...... 14... C/W BIAS V to GND..................................0.5V to +42V SW QFN8 (2mm x 2mm)............... 80...... 16... C/W V , V , V to GND ....................0.3V to +6V EN BRT FB MSOP8 .................................. 150..... 65... C/W (2) Continuous Power Dissipation (T = +25C) A Notes: QFN6 (3mm x 3mm) .................................. 2.5W 1) Exceeding these ratings may damage the device. QFN8 (2mm x 2mm) .................................. 1.6W 2) The maximum allowable power dissipation is a function of the MSOP8 .................................................... 0.83W maximum junction temperature T(MAX), the junction-to- J ambient thermal resistance , and the ambient temperature JA Storage Temperature.............. 65 C to +150 C T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX)=(T (MAX)- (3) D J Recommended Operating Conditions T )/ . Exceeding the maximum allowable power dissipation A JA will cause excessive die temperature, and the regulator will go Supply Voltage V ........................2.7V to 36V BIAS into thermal shutdown. Internal thermal shutdown circuitry Operating Temperature............. 40 C to +85 C protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7 4-layer board. MP1528 Rev. 1.9 www.MonolithicPower.com 2 1/25/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved.