Click here to ask about the production status of specific part numbers. MAX17551 60V, 50mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22A No-Load Supply Current General Description Benefits and Features The MAX17551 high-efficiency, high-voltage, synchronous Reduces External Components and Total Cost step-down DC-DC converter with integrated MOSFETs No SchottkySynchronous operates over a 4V to 60V input. The converter can deliver Internal Compensation for Any Output Voltage Built-In Soft-Start up to 50mA and generates output voltages from 0.8V up to 0.9 x V . The feedback (FB) voltage is accurate to within All-ceramic capacitors, Compact Layout IN 1.75% over -40C to +125C. Reduces Number of DC-DC Regulators to Stock Wide 4V to 60V Input The MAX17551 uses peak-current-mode control and can be operated in pulse-width modulation (PWM) or pulse- Adjustable 0.8V to 0.9 x V Output IN 100kHz to 2.2MHz Adjustable Switching Frequency frequency modulation (PFM) modes. with External Synchronization The device is available in a 10-pin (3mm x 2mm) TDFN and 10-pin (3mm x 3mm) MAX packages. Simulation Reduces Power Dissipation 22A Quiescent Current models are available. Peak Efficiency > 90% Applications PFM Enables Enhanced Light-load Efficiency 1.2A Shutdown Current Industrial Sensors and Process Control Operates Reliable in Adverse Environments High-Voltage LDO Replacement Peak Current Limit Protection Battery-Powered Equipment Built-In Output Voltage Monitoring RESET HVAC and Building Control Programmable EN/UVLO Threshold Monotonic Startup in to Prebiased Load Overtemperature Protection MAX is a registered trademark of Maxim Integrated Products, Inc. High Industrial -40C to +125C Ambient Operating Ordering Information appears at end of data sheet. Temperature Range / -40C to +150C Junction Temperature Range Typical Application CircuitHigh-Efficiency 5V, 50mA Regulator L1 V V IN OUT 330H 6V TO 60V 5V IN LX MAX17551 C OUT C IN 10F 1F EN/UVLO GND R4 SS 22.1 V OUT C1 R1 0.22F MODE 261k FB RT/SYNC R2 49.9k R3 SWITCHING FREQUENCY = 300kHz 140k L1 COILCRAFT LPS5030-334M RESET C MURATA 10F/X7R/6.3V/0805 (GRM21BR70J106K) OUT C MURATA 1F/X7R/100V/1206 (GRM31CR72A105K) IN 19-7110 Rev 3 1/21MAX17551 60V, 50mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22A No-Load Supply Current Absolute Maximum Ratings (Note 1) IN, EN/UVLO, V , RESET to GND.....................-0.3V to 70V Continuous Power Dissipation (T = +70C) OUT A LX to GND ......................................................-0.3V to IN + 0.3V TDFN (derate 14.9mW/C above +70C) ..............1188.7mW RT/SYNC, SS, FB, MODE to GND ...........................-0.3V to 6V MAX (derate 8.8mW/C above +70C) ..................707.3mW LX Total RMS Current ........................................................0.8A Junction Temperature ......................................................+150C Output Short-Circuit Duration ....................................Continuous Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 1: Junction temperature greater than +125C degrades operating lifetimes. Package Information PACKAGE TYPE: 10 TDFN Package Code T1032N+1 Outline Number 21-0429 Land Pattern Number 90-0082 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) 67.3C/W JA Junction to Case ( ) 18.2C/W JC PACKAGE TYPE: 10 MAX Package Code U10+5 Outline Number 21-0061 Land Pattern Number 90-0330 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) 113.1C/W JA Junction to Case ( ) 42C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Maxim Integrated 2 www.maximintegrated.com