MP1567 1.2A Synchronous Rectified Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP1567 is a 1.2A, 800KHz DC to DC 1.2A Output Current converter designed for low voltage applications Synchronous Rectified requiring high efficiency. Capable of providing Internal 180m and 220m Power Switches output voltages as low as 0.9V from a 3.3V V Range of 2.6V to 6V IN supply voltage, the MP1567 eliminates the Over 90% Efficiency need for a 5V rail, providing over 90% efficiency Zero Current Shutdown Mode via synchronous rectification and eliminating Under Voltage Lockout Protection heat issues in confined spaces. Soft-start Soft-Start Operation operation protects internal circuitry from hard Thermal Shutdown turn on issues. Switching at 800KHz reduces Internal Current Limit (Source & Sink) the size of external components and thereby Tiny 10-Pin MSOP or QFN Packages reduces board space. Evaluation Boards Available The MP1567 includes cycle-by-cycle current limiting and under voltage lockout. Internal APPLICATIONS power switches combined with the tiny 10-pin SOHO Routers, PCMCIA Cards, Mini PCI MSOP or QFN packages provide a solution Handheld Computers, PDAs requiring a minimum of space. Cell Phones Digital Video Cameras EVALUATION BOARD REFERENCE Small LCD Displays Board Number Dimensions MPS and The Future of Analog IC Technology are Registered Trademarks EV0033 (MP1567DK) 2.5X x 2.0Y x 0.7Z of Monolithic Power Systems, Inc. EV0059 (MP1567DK) 2.5X x 2.0Y x 0.4Z EV0060 (MP1567DQ) 2.5X x 2.0Y x 0.4Z TYPICAL APPLICATION Efficiency vs INPUT 2.6V to 6V 10nF Load Current 100 2 1 90 V =3.3V IN IN BS 80 10 3 V OUT OFF ON EN SW 1.8V/1.2A 7 70 FB MP1567 V =4V 6 9 60 IN BP OPEN IF SS NOT USED 50 SGND PGND COMP V =5V 40 IN 5 4 8 10nF 30 10nF 20 1nF 10 V =1.8V OUT 0 10 100 1000 LOAD CURRENT (mA) MP1567 TAC S01 MP1567 EC01 MP1567 Rev. 2.4 www.MonolithicPower.com 1 9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved. EFFICIENCY (%)MP1567 1.2A SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER PACKAGE REFERENCE TOP VIEW TOP VIEW BS 1 10 EN BS 1 10 EN IN 2 9 BP IN 2 9 BP SW 3 8 COMP SW 3 8 COMP PGND 4 7 FB PGND 4 7 FB SGND 5 6 SS SGND 5 6 SS EXPOSED PAD MP1567 PD01 MSOP10 MP1567 PD02 QFN10 ON BACKSIDE Part Number** Package Temperature Part Number* Package Temperature QFN10 MP1567DQ 40 C to +85C MP1567DK MSOP10 40 C to +85C (3mm x 3mm) For Tape & Reel, add suffix Z (eg. MP1567DKZ) For Tape & Reel, add suffix Z (eg. MP1567DQZ) * ** For Lead Free, add suffix LF (eg. MP1567DQLFZ) For Lead Free, add suffix LF (eg. MP1567DKLFZ) (1) (3) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Input Supply Voltage V ............................. 6.5V MSOP10 ................................ 150..... 65... C/W IN SW Voltage V ................... 0.3V to V + 0.3V SW IN 3x3 QFN10 ............................. 50...... 12... C/W BS to SW Voltage .........................0.3V to +6V Notes: Voltage at All Other Pins ...............0.3V to +6V 1) Exceeding these ratings may damage the device. Storage Temperature.............. 55 C to +150 C 2) The device is not guaranteed to function outside of its (2) operating conditions. Recommended Operating Conditions 3) Measured on approximately 1 square of 1 oz copper. Input Supply Voltage V ....................2.6V to 6V IN Output Voltage V ........................0.9V to 4.5V OUT Operating Temperature............. 40 C to +85 C ELECTRICAL CHARACTERISTICS V = 5V, T = +25 C, unless otherwise noted. IN A Parameter SymbolCondition Min Typ Max Units Input Voltage Range V 2.6 6 V IN Input Undervoltage Lockout 2.2 V Input Undervoltage Lockout Hysteresis 100 mV Shutdown Supply Current V 0.3V 0.5 1.0 A EN Operating Supply Current V > 2V, V = 1.1V 1.2 1.8 mA EN FB BP Voltage V V = 2.6 to 6V 2.4 V BP IN EN Input Low Voltage V 0.4 V IL EN Input High Voltage V 1.5 V HL EN Hysteresis 100 mV EN Input Bias Current 1 A Oscillator Switching Frequency f 800 KHz SW Maximum Duty Cycle D V = 0.7V 85 % MAX FB Minimum On Time t 200 ns ON MP1567 Rev. 2.4 www.MonolithicPower.com 2 9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2007 MPS. All Rights Reserved.