EVALUATION KIT AVAILABLE MAX17532 42V, 100mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22A No-Load Supply Current General Description Benefits and Features The MAX17532 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 42V input. The converter can deliv- Internal Compensation for Any Output Voltage Built-In Soft-Start er up to 100mA and generates output voltages from 0.8V up to 0.9 x V . The feedback (FB) voltage is accurate to All-Ceramic Capacitors, Compact Layout IN within 1.75% over -40C to +125C. Reduces Number of DC-DC Regulators to Stock Wide 4V to 42V Input The MAX17532 uses peak-current-mode control and can be operated in pulse-width modulation (PWM) or pulse Adjustable 0.8V to 0.9 x VIN Output 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 High-Voltage LDO Replacement Operates Reliably in Adverse Environments Battery-Powered Equipment Peak Current Limit Protection HVAC and Building Control Built-In Output Voltage Monitoring RESET Programmable EN/UVLO Threshold Monotonic Startup Into Prebiased Load Ordering Information appears at end of data sheet. Overtemperature Protection -40C to +125C Operation Typical Application CircuitsHigh-Efficiency 5V, 100mA Regulator L1 V V IN OUT 220H 6V TO 42V 5V, 100mA IN LX MAX17532 C OUT C IN 10F 1F EN/UVLO GND R4 SS 22.1 V OUT C1 R1 F 0.22 MODE 261k FB RT/SYNC R2 49.9k R3 SWITCHING FREQUENCY = 220kHz 191k L1 COILCRAFT LPS5030-224M RESET C MURATA 10F/X7R/6.3V/1206 (GRM31CR70J106K) OUT C MURATA 1F/X7R/50V/0805 (GRM21BR71H105K) IN MAX is a registered trademark of Maxim Integrated Products, Inc. 19-7436 Rev 1 3/15MAX17532 42V, 100mA, Ultra-Small, High-Efficiency Synchronous Step-Down DC-DC Converter with 22A No-Load Supply Current Absolute Maximum Ratings IN, EN/UVLO, V , RESET to GND.....................-0.3V to 48V Operating Temperature Range ......................... -40C to +125C OUT LX to GND ......................................................-0.3V to IN + 0.3V Junction Temperature ......................................................+150C RT/SYNC, SS, FB, MODE to GND ...........................-0.3V to 6V Storage Temperature Range ............................ -65C to +150C LX Total RMS Current ........................................................1.6A Lead Temperature (soldering, 10s) .................................+300C Output Short-Circuit Duration ....................................Continuous 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) Package Thermal Characteristics TDFN MAX Continuous Power Dissipation (T = +70C) Continuous Power Dissipation (T = +70C) A A (derate 14.9mW/C above +70C) .....................1188.7mW (derate 8.8mW/C above +70C) ..........................707.3mW Junction-to-Ambient Thermal Resistance ( ) .......67.3C/W Junction-to-Ambient Thermal Resistance ( ) .....113.1C/W JA JA Junction-to-Case Thermal Resistance ( ) ............18.2C/W Junction-to-Case Thermal Resistance ( ) ...............42C/W JC JC Note 1: 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. Electrical Characteristics (V = 24V, V = 0V, V = 3.3V, V = 0.85V, V = 1.5V, RT/SYNC = 191k, LX = SS = MODE = RESET = uncon- IN GND VOUT FB EN/UVLO nected T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced to GND, A J A unless otherwise noted) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (IN) Input Voltage Range V 4 42 V IN Input Shutdown Current I V = 0V, T = +25C 0.67 1.2 2.25 IN-SH EN/UVLO A I V = unconnected (Note 2) 18 32 A Q-PFM MODE Input Supply Current I Normal switching mode, V = 24V 245 525 760 Q-PWM IN EXTERNAL BIAS (V OUT) V Switchover Threshold 2.96 3.05 3.12 V OUT ENABLE/UVLO (EN/UVLO) V V rising 1.2 1.25 1.3 ENR EN/UVLO EN/UVLO Threshold V V falling 1.1 1.15 1.2 V ENF EN/UVLO V V falling, true shutdown 0.7 EN-TRUESD EN/UVLO EN/UVLO Leakage Current I V = 1.3V, T = +25C -100 +100 nA EN EN/UVLO A POWER MOSFETs High-Side pMOS On-Resistance R I = 0.1A (sourcing) 1.5 2.7 5.1 DS-ONH LX Low-Side nMOS On-Resistance R I = 0.1A (sinking) 0.8 1.4 2.6 DS-ONL LX V = 0V, T = +25C, EN A LX Leakage Current I -1 +1 A LX-LKG V = (V + 1V) to (V - 1V) LX GND IN Maxim Integrated 2 www.maximintegrated.com