EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX17574 4.5V to 60V, 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation General Description Benefits and Features The MAX17574, high-efficiency, high-voltage, synchronous Reduces External Components and Total Cost step-down DC-DC converter with integrated MOSFETs No Schottky-Synchronous Operation operates over a 4.5V to 60V input. The converter can deliv er up Internal Compensation for Any Output Voltage to 3A current. Output voltage is programmable from 0.9V All-Ceramic Capacitors, Compact Layout up to 90%V . The feedback voltage regulation accuracy IN Reduces Number of DC-DC Regulators to Stock over -40C to +125C is 0.9%. Wide 4.5V to 60V Input The MAX17574 features a peak-current-mode control Adjustable Output Voltage Range from 0.9V up to architecture. The device can be operated in the pulse- 90% of V IN width modulation (PWM), pulse-frequency modulation Delivers up to 3A Current Over Temperature (PFM), or discontinuous-conduction mode (DCM) control 100kHz to 2.2MHz Adjustable Switching Frequency schemes. A programmable soft-start feature allows users with External Synchronization to reduce input inrush current. The device also incorporates Reduces Power Dissipation an output enable/undervoltage lockout pin (EN/UVLO) Peak Efficiency > 90% that allows the user to turn on the part at the desired PFM and DCM Modes Enable Enhanced input voltage level. An open-drain RESET pin provides a Light-Load Efficiency delayed power-good signal to the system upon achieving Auxiliary Bootstrap LDO for Improved Efficiency successful regulation of the output voltage. 2.8A Shutdown Current The MAX17574 is available in a 24-pin (4mm x 5mm) Operates Reliably in Adverse Industrial Environments TQFN package. Simulation models are available. Hiccup Mode Overload Protection Adjustable Soft-Start and Prebiased Power-Up Applications Built-In Output-Voltage Monitoring with RESET Industrial Control Power Supplies Programmable EN/UVLO Threshold General-Purpose Point-of-Load Monotonic Startup Into Prebiased Load Distributed Supply Regulation Overtemperature Protection Base Station Power Supplies High Industrial -40C to +125C Ambient Operating Wall Transformer Regulation Temperature Range/-40C to +150C Junction High-Voltage, Single-Board Systems Temperature Range Ordering Information appears at end of data sheet. 19-8635 Rev 3 7/18MAX17574 4.5V to 60V, 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation Absolute Maximum Ratings V to PGND .........................................................-0.3V to +65V PGND to SGND.................................................... -0.3V to +0.3V IN EN/UVLO to SGND ...............................................-0.3V to +65V LX Total RMS Current ..................................................... 5.6A LX to PGND..................................................-0.3V to V + 0.3V Output Short-Circuit Duration ................................. Continuous IN EXTVCC to SGND ................................................-0.3V to +26V Continuous Power Dissipation (multilayer Board) (T = +70C, A BST to PGND ........................................................-0.3V to +70V derate 41.7mW/C above +70C.) .............................3333mW BST to LX .............................................................-0.3V to +6.5V Operating Temperature Range (Note 1)........... -40C to +125C BST to V ...........................................................-0.3V to +65V Junction Temperature ................................................... +150C CC RESET, SS, MODE/SYNC, Storage Temperature Range ........................... -65C to +150C V , RT, CF to SGND ......................................-0.3V to +6.5V Lead Temperature (soldering, 10s) ............................... +300C CC FB to SGND .........................................................-0.3V to +1.5V Soldering Temperature (reflow) .................................... +260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only 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. Package Information PACKAGE TYPE: 24 TQFN Package Code T2445+2C Outline Number 21-0201 Land Pattern Number 90-0083 THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2) Junction to Ambient ( ) 24C/W JA Junction to Case ( ) 1.8C/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. Note 1: Junction temperature greater than +125C degrades operating lifetimes. Note 2: Package thermal resistances were obtained using the MAX17574 evaluation kit with no airflow. 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