MP4473GL-Z

MP4473 High-Efficiency, Fast-Transient, 3.5A, 36V Synchronous, Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP4473 is a fully integrated, highfrequency, synchronous, rectified, step-down, switch-mode converter. It offers a compact solution to achieve a 3.5A, continuous-output current over a wide input-supply range with excellent load and line regulation. It provides fast, transient response and good stability for wide input-supply and load range. The MP4473 operates at high efficiency over a wide-outputcurrent load range. • • • • • • • • • • • MP4473 has full protection features including, short-circuit protection (SCP), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown (TSD). The MP4473 requires minimal, readily available, standard, external components, and is available in a compact 3mmx4mm, 20-pin, QFN package. Wide 4.5V-to-36V Operating Input Range Guaranteed 3.5A, Continuous Output Current Internal 40mΩ High-Side, 20mΩ Low-Side Power MOSFETs Proprietary Switching-Loss-Reduction Technology 1% Reference Voltage Programmable Soft-Start Time Low Drop-Out Mode 200kHz-to-1MHz Switching Frequency SCP, OCP, UVP, and Thermal Shutdown Output Adjustable from 0.8V to 0.9×VIN Available in a 3mmx4mm, 20-pin, QFN Package APPLICATIONS • • • • • • Notebook Systems and I/O Power Automotive Systems Networking Systems Industrial Supplies Optical Communications Systems Distributed Power and POL Systems All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 8,19,21,22,23 VIN C1 10 IN R3 63.4k EN C5 1 C3 0.1 MP4473 2 R5 499k 7 BST SW FREQ 20 VCC 9,10,17,18,24,25 EN FB 3 SS AGND PGND 4 C6 33nF MP4473 Rev. 1.0 12/15/2014 R4 620k 6 PGOOD 5 1 11-16 VOUT 3.3V L1 C4 390pF R1 31.6k 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 10 1 MP4473–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking MP4473GL QFN-20 (3mmx4mm) See Below * For Tape & Reel, add suffix –Z (e.g. MP4473GL–Z); TOP MARKING MP: MPS prefix: Y: year code; W: week code: 4473: first four digits of the part number; LLL: lot number; PACKAGE REFERENCE 20 1 19 18 17 16 21 IN 2 24 SW 3 22 IN 4 25 SW 5 23 IN 6 7 15 14 13 12 11 8 9 10 QFN20 (3mm×4mm) MP4473 Rev. 1.0 12/15/2014 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 MP4473–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN ....................................... 40V VSW ........................................-0.3V to VIN + 0.3V VBST ...................................................... VSW + 6V VPGOOD ....................................-0.3V to VCC+0.6V All Other Pins ..................................-0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) ………………………………… …………….2.6W Operating Junction Temperature ..............150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions (3) Supply Voltage VIN ...........................4.5V to 36V Output Voltage VOUT ................... 0.8V to 0.9×VIN Operating Junction Temp. (TJ). -40°C to +125°C MP4473 Rev. 1.0 12/15/2014 Thermal Resistance (4) θJA θJC QFN-20 (3mm×4mm)..............48 ...... 10 ... °C/W Notes: 1) Absolute maximum ratings are rated under room temperature unless otherwise noted. Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry 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 PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 MP4473–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS VIN = 24V, VEN = 2V, TJ = 25°C, unless otherwise noted. Parameters Supply Current (Shutdown) Supply Current (Quiescent) HS Switch On Resistance LS Switch On Resistance (5) Switch Leakage Symbol IIN IIN HSRDS-ON LSRDS-ON SWLKG Condition VEN = 0V VFB = 0.95V VEN = 0V VSW = 0V or 36V Current Limit One-Shot On Time Minimum Off Time(5) ILIMIT tON tOFF Fold-Back Off Time(5) tFB Fold-Back Off Time(5) tFB OCP Hold-Off time(5) tOC ILIM=1(HIGH), FB>50%VREF ILIM=1(HIGH), FB