MP3021 1x, 1.5x, 2x Auto-Adjust Charge Pump White LED Backlight Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP3021 is a WLED driver that can drive up Backlight: up to 4 WLEDs at 30mA Each TM to 4 backlight WLEDs at up to 30mA each. Single Wire Serial Bus (MPC Serial Data Link) Backlight brightness is adjusted using a 5-bit Simple, Low Overhead Solution register plus one bit for precise low brightness Fast Data Transfer Rate control. Good Current Matching at Low LED Current Thermal Shutdown Protection The MP3021 employs a super efficient Under-Voltage Protection inductorless charge pump with 1x, 1.5x and 2x Available in a 3mm x 3mm 16-Pin QFN Package automatic mode control to achieve high Low EMI Noise efficiency power conversions. TM Monolithic Power Systems single wire MPC APPLICATIONS serial data link provides a simple and fast Cellular Phones interface used to enable, disable and set PDA Phones current levels for each LED. In addition, PDAs soft-start limits the inrush current during startup Other Small Portable Displays and mode switching. MPS and The Future of Analog IC Technology are Registered Trademarks of Each output is current limited, providing Monolithic Power Systems, Inc. controlled brightness and short circuit protection. MPC is a Trademark of Monolithic Power Systems, Inc. Thermal shutdown protection guards against excessive temperatures due to circuit loads and shorts. The tiny 3mm x 3mm QFN 16-pin package and small external capacitors deliver the most compact white LED solution available. TYPICAL APPLICATION Efficiency vs Battery Voltage 7 BATT VIN D1 D2 D3 D4 100 I LED=10mA 4 C1A 90 3 C1B 80 6 16 C2A 70 LED0 15 MP3021 2 LED1 C2B 60 14 LED2 8 I LED=20mA I LED=30mA 13 50 SINGLE PIN SERIAL PORT DATA LED3 120mA Total Backlight 11 40 ISET 1 CP 30 COMMON ANODE 5 CONFIGURATION VSS 20 2.5 3.0 3.5 4.0 4.5 BATTERY VOLTAGE (V) MP3021 Rev. 1.0 www.MonolithicPower.com 1 11/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP1519 EFFICIENCY (%)MP3021 1X, 1.5X, 2X AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT DRIVER (1) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS All Other Pins..............................0.3V to +6.5V TOP VIEW PIN 1 ID Junction Temperature...............................150C LED0 LED1 LED2 LED3 Lead Temperature ....................................260C 16 15 14 13 Storage Temperature ..............65C to +150C CP 1 12 NC Supply Voltage VIN ........................... 2.5V to 6V Operating Temperature .............40C to +85C C2B 2 11 ISET (2) Recommended Operating Conditions Supply Voltage V .......................... 2.7V to 5.5V C1B 3 10 NC IN Operating Temperature .............40C to +85 C C1A 4 9 NC (3) Thermal Resistance JA JC 5 6 7 8 QFN16 (3mm x 3mm)............. 60...... 12... C/W VSS C2A VIN DATA Notes: EXPOSED PAD 1) Exceeding these ratings may damage the device. CONNECT TO PIN 5 2) The device is not guaranteed to function outside of its operating conditions. Part Number* Package Temperature 3) Measured on approximately 1 square of 1 oz copper. QFN16 MP3021DQ 40 C to +85C (3mm x 3mm) For Tape & Reel, add suffix Z (eg. MP3021DQZ) * For RoHS compliant packaging, add suffix LF (eg. MP3021DQLFZ) ELECTRICAL CHARACTERISTICS V = 4.2V, T = +25 C, unless otherwise noted. IN A Parameter Symbol Condition Min Typ MaxUnits Input Supply Voltage V 2.7 5.5 V IN Supply Current I 1X Mode I = 20mA 83.6 mA IN LED ea Supply Current Shutdown I V = 0V 0.1 1.0 A IN SHDN DATA (4) Current Matching I I = 20mA 1.5 3.0 % LED MATCH LED DATA Voltage, High V 1.2 V DATA (HIGH) DATA Voltage, Low V 0.4 V DATA (LOW) DATA Pin Leakage I V = 5V -1.0 +1.0 A DATA DATA Data Acceptance Pulse Width T 1.5 3.5 s DAPW Data Stop Pulse Width T 8 s DSPW Charge Pump Frequency F V= 3.3V 1.0 1.25 1.5 MHz CP IN Voltage of ISET V 1.25 V ISET Backlight LED Current for each HC/LC = 0, R1=4.17k 30 mA I BL LED HC/LC = 1, R1=6.25k 2 2.2 mA HC/LC = 0, R1=6.25k 20 22 mA (5) Thermal Shutdown T 150 C S Note: 4) Current matching definition: (Max Min)/(Max + Min) 5) Guaranteed by design. MP3021 Rev. 1.0 www.MonolithicPower.com 2 11/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP1519