MP4350 2.5A, 4MHz, 20V Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP4350 is a high frequency step-down 100 A Quiescent Current switching regulator with an integrated internal Wide 4.5V to 20V Operating Input Range high-side high voltage power MOSFET. It 150m Internal Power MOSFET provides 2.5A output with current mode control Up to 4MHz Programmable Switching for fast loop response and easy compensation. Frequency Ceramic Capacitor Stable The wide 4.5V to 20V input range Internal Soft-Start accommodates a variety of step-down Internal Set Current Limit without a Current applications, including those in an automotive Sensing Resistor input environment. A 100A operational Up to 95% Efficiency quiescent current allows use in battery-powered applications. Output Adjustable from 0.8V to 16V Available in a 10-Pin QFN (3mm x 3mm) Package High power conversion efficiency over a wide load range is achieved by scaling down the APPLICATIONS switching frequency at light load condition to DSL Power reduce the switching and gate driving losses. Set Top Boxes The frequency foldback helps prevent inductor Battery Powered Systems current runaway during startup and thermal MPS and The Future of Analog IC Technology are Registered Trademarks of shutdown provides reliable, fault tolerant Monolithic Power Systems, Inc. operation. By switching at 4MHz, the MP4350 is able to prevent switching related EMI (Electromagnetic Interference) noise problems, such as those found in AM radio and ADSL applications. The MP4350 is available in a small 3mm x 3mm 10-pin QFN package. TYPICAL APPLICATION C4 Efficiency vs 100nF Load Current 100 10 V =5V IN 8,9 BST 1,2 V 90 OUT SW V VIN IN 3.3V D1 80 V =12V IN 3 5 70 FB EN EN MP4350 60 7 4 50 COMP FREQ C3 GND 220pF 40 C6 V =3.3V OUT 5 NS 30 0 0.5 1.0 1.5 2.0 2.5 LOAD CURRENT (A) MP4350 Rev. 1.0 www.MonolithicPower.com 1 1/21/2020 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. EFFICIENCY (%)MP4350 2.5A, 4MHz, 20V STEP-DOWN CONVERTER (1) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ..................... 0.3V to +22V IN Switch Voltage (V ) ............ 0.3V to V + 0.3V SW IN TOP VIEW BST to SW ..................................... 0.3V to +6V All Other Pins ................................. 0.3V to +6V SW 1 10 BST Junction Temperature ............................... 150C Lead Temperature .................................... 260 C SW 2 9 VIN Storage Temperature ............... 65C to +150 C EN 3 8 VIN (2) COMP 4 7 FREQ Recommended Operating Conditions FB 5 6 GND Supply Voltage V ........................... 4.5V to 20V IN Output Voltage V ....................... +0.8V to 16V OUT EXPOSED PAD Operating Temperature ............. 40 C to +85 C ON BACKSIDE (3) Thermal Resistance JA JC QFN10 (3mm x 3mm) ............. 50 ....... 12 ... C/W Part Number* Package Notes: MP4350DQ QFN10 (3x3) 1) Exceeding these ratings may damage the device. Temperature Top Marking 2) The device is not guaranteed to function outside of its operating conditions. 40 C to +85C M8YW 3) Measured on JESD51-7 4-layer board. For Tape & Reel, add suffix Z (eg. MP4350DQZ) * For RoHS compliant packaging, add suffix LF (eg. MP4350DQLFZ) ELECTRICAL CHARACTERISTICS V = 12V, V = 2.5V, V = 1.4V, T = +25 C, unless otherwise noted. IN EN COMP A Parameter SymbolCondition Min Typ MaxUnits Feedback Voltage VFB 4.5V < VIN < 20V 0.776 0.8 0.824 V Upper Switch On Resistance R V V = 5V 150 m DS(ON) BST SW Upper Switch Leakage V = 0V, V = 0V, V = 36V 1 A EN SW IN Current Limit Duty Cycle = 50% 2.9 3.5 A COMP to Current Sense GCS 6 A/V Transconductance (4) Error Amp Voltage Gain 200 V/V Error Amp Transconductance I = 3A 40 60 80 A/V COMP Error Amp Min Source current V = 0.7V 5 A FB Error Amp Min Sink current V = 0.9V 5 A FB VIN UVLO Threshold 2.7 3.0 3.3 V VIN UVLO Hysteresis 0.35 V (4) Soft-Start Time 0V < V < 0.8V 1.5 ms FB RFREQ = 45k 1.6 2 2.4 MHz Oscillator Frequency RFREQ = 18k 3.2 4 4.8 MHz Shutdown Supply Current VEN = 0V 12 18 A Quiescent Supply Current No load, VFB = 0.9V 100 125 A Thermal Shutdown 150 C MP4350 Rev. 1.0 www.MonolithicPower.com 2 1/21/2020 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved.