Click here for production status of specific part numbers. MAX17536 4.5V to 60V, 4A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation General Description Benefits and Features The MAX17536 high-efficiency, high-voltage, synchronous Reduces External Components and Total Cost step-down DC-DC converter with integrated high-side No Schottky-Synchronous Operation MOSFET operates over a 4.5V to 60V input. The Internal Compensation for Any Output Voltage converter can deliver up to 4A and generates output Built-In Soft-Start voltages from 0.9V up to 0.9 x V . The feedback (FB) All-Ceramic Capacitors, Compact Layout IN voltage is accurate to within 1.4% over -40C to +125C. Reduces Number of DC-DC Regulators to Stock The MAX17536 uses peak current-mode control. The Wide 4.5V to 60V Input device can be operated in the pulse-width modulation Adjustable Output Voltage Range from 0.9V up to (PWM), pulse-frequency modulation (PFM), and 90% of V IN discontinuous-conduction mode (DCM) control schemes. 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization The device is available in a 20-pin (5mm x 5mm) thin QFN Reduces Power Dissipation (TQFN) package. Simulation models are available. Peak Efficiency > 95% Applications PFM/DCM Modes Enables Enhanced Light-Load Efficiency Industrial Power Supplies Auxiliary Bootstrap LDO for Improved Efficiency Distributed Supply Regulati on 3.5A Shutdown Current Base-Station Power Supplie s Operates Reliably in Adverse Industrial Environments Wall Transformer Regulatio n Hiccup or Latchoff Mode Overload Protection High -Voltage Single-Board Systems DL-to-LX Short Detection Feature General-Purpose Point-of-L oad Built-In Output-Voltage Monitoring with RESET Programmable EN/UVLO Threshold Monotonic Startup into Prebiased Load Ordering Information appears at end of data sheet. Overtemperature Protection High Industrial -40oC to +125C Ambient Operating Temperature Range / -40C to +150C Junction Temperature Range Typical Application Circuit for 5V Output VIN 6.5V-60V C1 C2 C3 C4 C5 2.2F 2.2F 0.1F 0.1F 0.1F EN/UVLO VIN VIN VIN VIN RT BST MODE/SYNC C11 0.1F VCC LX L1 C6 VOUT 2.2F MAX17536 LX SGND 4.7H 5V,4A LX C8 C9 C10 N1 47F 22F 22F CF R1 DL RESET 4.7 R3 196k SS PGND EXTVCC FB C7 22000pF R8 F = 450kHz SW R4 V OUT L1 = XAL6060-472ME 4.7 43.2k C13 N1 = SIS468DN 0.1F C6 = 2.2F/X7R/10V/0603(MURATA GRM188R71A225K) C8 = 47F/X7R/10V/1210(MURATA GRM32ER71A476KE15) C9 = C10 = 22F/X7R/10V/1210(MURATA GRM32ER71A226K) C13 = 0.1F/50V/X7R/0402 (TDK C1005X7R1H104K050BB) TYPICAL APPLICATION CIRCUIT FOR 5V OUTPUT 19-7586 Rev 2 6/18MAX17536 4.5V to 60V, 4A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation Absolute Maximum Ratings V to PGND .........................................................-0.3V to +65V LX Total RMS Current ........................................................9.9A IN EN/UVLO, SS to SGND ........................................-0.3V to +65V Output Short-Circuit Duration ....................................Continuous LX to PGND................................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) (multilayer board) IN A BST to PGND ........................................................-0.3V to +70V TQFN (derate 33.3mW/C above T = +70C) ......2666.7mW A 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 FB, CF, RESET, MODE/SYNC, RT to SGND ......-0.3V to +6.5V Storage Tempera ture Range ............................ -65C to +160C DL, V to PGND ................................................-0.3V to +6.5V Lead Temperatur e (soldering, 10s) .................................+300C CC SGND to PGND ....................................................-0.3V to +0.3V Soldering Temperature (reflow) .......................................+260C EXTVCC to PGND ................................................-0.3V to +26V 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. Package Information PACKAGE TYPE: 20 TQFN-EP* Package Code T2055+4 Outline Number 21-0140 Land Pattern Number 90-0009 THERMAL RESISTANCE, FOUR-LAYER BOARD: (Note 2) Junction to Ambient ( ) 23C/W JA Junction to Case ( ) 2C/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: Applicable only to the Evaluation Kit in free space with no airflow. Electrical CharacteristicsElectrical Characteristics (V = V = 24V, R = open (450kHz), C = 2.2F, V = V = V / = 0V, LX = SS = RESET = open, V IN EN/UVLO RT VCC PGND SGND MODE SYNC BST to V = 5V, V = 1V, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced LX FB A A to SGND, unless otherwise noted.) (Note 3) 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) 3.5 5.5 IN-SH EN/UVLO V = 1V, MODE = RT= open 128 A FB I Q PFM V = 1V, MODE = open, R = 40.2k 168 Input Quiescent Current FB RT I DCM mode, V = 0.1V 1.27 2 mA Q DCM LX ENABLE/UVLO (EN/UVLO) V V rising 1.19 1.215 1.24 ENR EN/UVLO EN/UVLO Threshold V V V falling 1.068 1.09 1.112 ENF EN/UVLO EN/UVLO Input Leakage Current I V = 1.245V, T = +25C -50 0 +50 nA EN EN/UVLO A www.maximintegrated.com Maxim Integrated 2