MP1591 2A, 32V, 330KHz Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP1591 is a high voltage step-down Wide 6.5V to 32V Input Operating Range converter ideal for automotive power adapter 34V Absolute Maximum Input battery chargers. Its wide 6.5V to 32V input 2A Output Current voltage range covers the automotive batterys 120m Internal Power MOSFET Switch requirements and it achieves 2A continuous Stable with Low ESR Output Ceramic output for quick charge capability. Capacitors Up to 95% Efficiency Current mode operation provides fast transient 20 A Shutdown Mode response and eases loop stabilization. Fault protection includes cycle-by-cycle current Fixed 330KHz Frequency limiting and thermal shutdown. In shutdown Thermal Shutdown mode, the converter draws only 20 A of supply Cycle-by-Cycle Over Current Protection current. Output Adjustable From 1.23V to 21V Under Voltage Lockout The MP1591 requires a minimum number of Reference Voltage Output readily available external components to Available in 8-Pin SOIC Packages complete a 2A step-down DC to DC converter solution. APPLICATIONS EVALUATION BOARD REFERENCE Automotive Power Adapters Board Number Dimensions PDA and Cellular Phone Battery Chargers Distributed Power Systems EV0020 2.1X x 1.4Y x 0.5Z Automotive Aftermarket Electronics MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION C2 10nF Efficiency vs INPUT Load Current 6.5V to 32V 100 V =5V OUT 90 2 1 V =3.3V 80 OUT IN BS OUTPUT 7 3 EN SW 2.5V OFF ON 70 2A MP1591 D1 8 5 OPEN 60 REF FB NOT USED GND COMP 50 4 6 40 C4 4.7nF C3 V =12V 30 IN OPEN 20 0 0.5 1 1.5 2 LOAD CURRENT (A) MP1591 Rev. 2.3 www.MonolithicPower.com 1 9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved. EFFICIENCY (%)MP1591 2A, 32V, 330KHz STEP-DOWN CONVERTER (1) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS IN Supply Voltage........................0.3V to +34V SW Voltage............................. 1V to V + 0.3V IN TOP VIEW BS Voltage ....................V 0.3V to V + 6V SW SW All Other Pins.................................0.3V to +6V BS 1 8 REF Junction Temperature...............................150C IN 2 7 EN Lead Temperature ....................................260C SW 3 6 COMP Storage Temperature ..............65C to +150C GND 4 5 FB (2) Recommended Operating Conditions EXPOSED PAD Input Voltage ................................... 6.5V to 32V ON BACKSIDE Operating Temperature .............40 C to +85 C (SOIC8N ONLY) CONNECT TO PIN 4 (3) Thermal Resistance JA JC SOIC8 (w/ Exposed Pad) ....... 50...... 10... C/W Part Number* Package Temperature SOIC8..................................... 90...... 45... C/W MP1591DN SOIC8E 40 C to +85C MP1591DS SOIC8 Notes: 40 C to +85C 1) Exceeding these ratings may damage the device. For Tape & Reel, add suffix Z (eg. MP1591DNZ) 2) The device is not guaranteed to function outside of its * For RoHS Compliant Packaging, add suffix LF operating conditions. (eg. MP1591DNLFZ) 3) Measured on approximately 1 square of 1 oz copper. ELECTRICAL CHARACTERISTICS V = 12V, T = +25 C, unless otherwise noted. IN A Parameter SymbolCondition Min Typ MaxUnits Shutdown Supply Current V = 0V 20 35 A EN Supply Current V = 5V, V = 1.4V 1.0 1.2 mA EN FB Feedback Voltage 6.5V V 32V, V < 2V 1.202 1.230 1.258 V IN COMP Error Amplifier Voltage Gain 400 V/V Error Amplifier Transconductance I = 10 A 500 700 1100 A/V C (4) High-Side Switch On Resistance 120 m (4) Low-Side Switch On Resistance 8.5 High-Side Switch Leakage Current V = 0V, V = 0V 0 10 A EN SW (5) Current Limit 2.5 3.6 4.9 A Current Sense to COMP 3.5 A/V Transconductance Oscillation Frequency 280 330 380 KHz Short Circuit Oscillation Frequency V = 0V 35 KHz FB (4) Maximum Duty Cycle V = 1.0V 90 % FB (4) Minimum Duty Cycle V = 1.5V 0 % FB EN Shutdown Threshold Voltage 0.8 1.2 1.6 V Enable Pull-Up Current V = 0V 1.8 A EN EN UVLO Threshold V Rising 2.4 2.6 2.8 V EN EN UVLO Threshold Hysteresis 250 mV MP1591 Rev. 2.3 www.MonolithicPower.com 2 9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved.