EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX17503 4.5V-60V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter With Internal Compensation General Description Benefits and Features The Himalaya series of voltage regulator ICs, power Eliminates External Components and Reduces modules, and chargers enable cooler, smaller, and simpler Total Cost power supply solutions. The MAX17503/MAX17503S No Schottky-Synchronous Operation for High high-efficiency, high-voltage, synchro nously rectified step- Efficiency and Reduced Cost down converter with dual integrated MOSFETs operates Internal Compensation for Stable Operation at Any over a 4.5V to 60V input. It delivers up to 2.5A and 0.9V Output Voltage to 90%V output voltage. Built-in compensation across All-Ceramic Capacitor Solution: Ultra-Compact IN the output voltage range eliminates the need for external Layout with as Few as Eight External Components components. The feedback (FB) regulation accuracy over Reduces Number of DC-DC Regulators to Stock -40C to +125C is 1.1%. The device is available in a Wide 4.5V to 60V Input Voltage Range compact (4mm x 4mm) TQFN-EP lead(Pb)-free package 0.9V to 90%V Output Voltage IN with an exposed pad. Simulation models are available. Delivers up to 2.5A Over Temperature The device features a peak-current-mode control 100kHz to 2.2MHz Adjustable Frequency with architecture with a MODE feature that can be used to External Clock Synchronization operate the device in pulse-width modulation (PWM), MAX17503S Allows Higher Frequency of Operation pulse-frequency modulation (PFM), or discontinuous- Available in a 20-Pin, 4mm x 4mm TQFN-EP Package conduction mode (DCM) control schemes. PWM operation Reduces Power Dissipation provides constant frequency operation at all loads, and is Peak Efficiency of 94% useful in applications sensitive to switching frequency. PFM and DCM Modes for High Light-Load Efficiency PFM operation disables negative inductor current and Shutdown Current = 2.8A (typ) additionally skips pulses at light loads for high efficiency. Operates Reliably DCM features constant frequency operation down to Hiccup-Mode Current Limit and Autoretry Startup lighter loads than PFM mode by not skipping pulses, but Built-In Output-Voltage Monitoring (Open-Drain only disabling negative inductor current at light loads. RESET Pin) DCM operation offers efficiency performance that lies Resistor-Programmable EN/UVLO Threshold between PWM and PFM modes. The MAX17503S offers Adjustable Soft-Start and Prebiased Power-Up a lower minimum on-time that allows for higher switching Wide -40C to +125C Ambient Operating frequencies and a smaller solution size. Temperature Range/-40C to +150C Junction A programmable soft-start feature allows users to reduce Temperature Range input inrush current. The device also incorporates an output enable/input undervoltage lockout pin (EN/UVLO) Ordering Information appears at end of data sheet. that allows the user to turn on the part at the desired input-voltage level. An open-drain RESET pin provides a delayed power-good signal to the sys tem upon achieving successful regulation of the output voltage. Applications Industrial Power Supplies Distributed Supply Regulation Base Station Power Supplies Wall Transformer Regulation High-Voltage Single-Board Systems General-Purpose Point-of-Load 19-6669 Rev 4 4/21MAX17503 4.5V-60V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter With Internal Compensation Absolute Maximum Ratings (Note 1) V to PGND .........................................................-0.3V to +65V SGND to PGND ....................................................-0.3V to +0.3V IN EN/UVLO to SGND ...............................................-0.3V to +65V LX Total RMS Current ...........................................................4A LX to PGND................................................-0.3V to (V + 0.3V) Output Short-Circuit Duration ....................................Continuous IN BST to PGND ........................................................-0.3V to +70V Continuous Power Dissipation (T = +70C) (multilayer board) A BST to LX .............................................................-0.3V to +6.5V TQFN-EP (derate 30.3mW/C above T = +70C) ...2424.2mW A BST to V ...........................................................-0.3V to +65V Junction Temperature ......................................................+150C CC CF, RESET, SS, MODE, SYNC, Storage Temperature Range .............................-65NC to +160C RT to SGND .....................................................-0.3V to +6.5V Lead Temperature (soldering, 10s) .................................+300C FB to SGND .........................................................-0.3V to +1.5V Soldering Temperature (reflow) .......................................+260C V to SGND .......................................................-0.3V to +6.5V CC 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. Note 1: Junction temperature greater than +125C degrades operating lifetimes. Package Information PACKAGE TYPE: 20 TQFN-EP Package Code T2044+4C Outline Number 21-100172 Land Pattern Number 90-0409 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) 33C/W JA Junction to Case ( ) 2C/W JC 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. 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. Electrical Characteristics (V = V = 24V, R = 40.2kI (500kHz), C = 2.2F, V = V = V = V = 0V, LX = SS = RESET = IN EN/UVLO RT VCC PGND SGND MODE SYNC open, V to V = 5V, V = 1V, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are BST LX FB A A referenced to SGND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (V ) IN Input Voltage Range V 4.5 60 V IN Input Shutdown Current I V = 0V (shutdown mode) 2.8 4.5 IN-SH EN/UVLO V = 1V, MODE = RT = open 118 A FB I Q PFM V = 1V, MODE = open 162 FB Input Quiescent Current I DCM mode, V = 0.1V 1.16 1.8 Q-DCM LX mA Normal switching mode, f = 500kHz, V SW FB I 9.5 Q PWM = 0.8V www.maximintegrated.com Maxim Integrated 2