MP38892DN-LF Monolithic Power Systems

MP38892 6A, 42V, 420KHz Step-Down Converter with Synchronizable Gate Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP38892 is a monolithic step-down switch Wide 4.5V to 42V Operating Input Range mode converter with a built in, internal high-side 6A Continuous Output Current power MOSFET. It achieves 6A continuous 1.5% Vfb accuracy output current over a wide input supply range 100m Internal Power MOSFET Switch with excellent load and line regulation. Synchronizable Gate Driver Delivers up to 95% Efficiency Current mode operation provides fast transient Fixed 420KHz Frequency response and eases loop stabilization. Synchronizable up to 1.5MHz Fault condition protection includes cycle-by-cycle Over Current Latch Off Protection current limiting and thermal shutdown. Thermal Shutdown The MP38892 requires a minimum number of Output Adjustable from 0.8V readily available standard external components Stable with Low ESR Output Ceramic and is available in an 8-pin SOIC package with Capacitors exposed pad. Available in a Thermally Enhanced 8-Pin SOIC Package APPLICATIONS Digital Set Top Boxes Personal Video Recorders Broadband Communications Flat Panel Television and Monitors MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 8 2 V IN BST IN MP38892 1 V OUT SW 3.3V 3 VCC 4 BG 7 6 EN/SYNC FB OFF ON GND 5 MP38892 Rev.1.0 www.MonolithicPower.com 1 9/21/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. MP38892 6A, 42V, 420KHZ STEP-DOWN WITH SYNCHRONIZABLE GATE DRIVER (1) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS Supply Voltage V ....................................... 45V IN V .........................-0.3V(-5V for < 10ns) to 46V SW V V ...................................................... 6V BST SW All Pins...........................................0.3V to +6V 1 8 Junction Temperature...............................150C 2 7 Lead Temperature ....................................260C 3 6 Storage Temperature ..............65 C to +150 C (2) 4 5 Recommended Operating Conditions Supply Voltage V ........................... 4.5V to 42V IN Operating Temperature .............40 C to +85 C (3) Thermal Resistance JA JC SOIC8E .................................. 50...... 10... C/W Notes: Part Number* Package Temperature 1) Exceeding these ratings may damage the device. MP38892DN SOIC8E 40 C to +85C 2) The device is not guaranteed to function outside of its operating conditions. For Tape & Reel, add suffix Z (eg. MP38892DNZ) * 3) Measured on JESD51-7, 4-layer PCB. For RoHS Compliant Packaging, add suffix LF (eg. MP38892DNLFZ) ELECTRICAL CHARACTERISTICS V = 12V, T = +25 C, unless otherwise noted. IN A Parameters SymbolCondition Min Typ Max Units Feedback Voltage V 0.796 0.808 0.820 V 4.5V V 42V FB IN Feedback Current I V = 0.8V 10 nA FB FB (4) Switch On Resistance R 100 m DS(ON) Switch Leakage V = 0V, V = 0V 0.1 10 A EN SW (4) Current Limit 7.5 8.0 A Oscillator Frequency f V = 0.6V 240 420 600 KHz SW FB Fold-back Frequency V = 0V 25 115 205 KHz FB Maximum Duty Cycle V = 0.6V 85 90 % FB (4) Minimum On Time t 100 ns ON Under Voltage Lockout Threshold Rising 3.90 4.10 4.30 V Under Voltage Lockout Threshold Hysteresis 880 mV EN Input Low Voltage 0.4 V EN Input High Voltage 2 V V = 2V 2 EN EN Input Current A V = 0V 0.1 EN Sync Frequency Range (Low) F 300 KHz SYNCL Sync Frequency Range (High) F 1.5 MHz SYNCH Enable Turnoff Delay T 5.0 s OFF Supply Current (Shutdown) V = 0V 1 10 A EN Supply Current (Quiescent) V = 2V, V = 1V 0.9 1.1 mA EN FB Thermal Shutdown 150 C BG Driver Bias Supply Voltage V I = 5mA 4.5 5.0 V CC CC (4) Gate Driver Sink Impedance R 1 SINK (4) Gate Driver Source Impedance R 4 SOURCE Gate Drive Current Sense Trip Threshold V 20 mV SW Note: 4) Guaranteed by design. MP38892 Rev.1.0 www.MonolithicPower.com 2 9/21/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved.