Click here for production status of specific part numbers. MAX17546 4.5V to 42V, 5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation General Description Benefits and Features The MAX17546 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 42V input. The Internal Compensation for Any Output Voltage converter can deliver up to 5A 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 MAX17546 uses peak current-mode control. The Wide 4.5V to 42V 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 (TQFN) package. Simulation models are available. Reduces Power Dissipation Peak Efficiency > 95% Applications PFM/DCM Modes Enable Enhanced Light-Load Industrial Power Supplies Efficiency Distributed Supply Regulation Auxiliary Bootstrap LDO for Improved Efficiency Base-Station Power Supplies 3.5A Shutdown Current Wall Transformer Regulation High-Voltage Single-Board Systems Operates Reliably in Adverse Industrial Environments Hiccup or Latchoff Mode Overload Protection General-Purpose Point-of-Load DL-to-LX Short Detection Feature Built-In Output-Voltage Monitoring with RESET Ordering Information appears at end of data sheet. Programmable EN/UVLO Threshold Monotonic Startup into Prebiased Load High Industrial -40C to +125C Ambient Operating Temperature Range / -40C to +150C Junction Temperature Range Typical Application Circuit for 5V Output VIN 6.5V-42V FSW = 450kHz L1 = XAL8080-472 C1 N1 = SIS468DN C2 C6 = 2.2F/X7R/10V/0603(MURATA GRM188R71A225K) 2.2F 2.2F C8 = C9 = C10 = 22F/X7R/10V/1210(MURATA GRM32ER71A226K) EN/UVLO VIN VIN VIN VIN C13=0.1F/50V/X7R/0402(TDK C1005X7R1H104K050BB) RT MODE/SYNC: 1.Connect to SGND for PWM Mode BST 2.Connect to VCC for DCM Mode MODE/SYNC C11 3.Leave OPEN for PFM Mode 0.1F VCC LX L1 C6 V OUT 2.2F LX MAX17546 SGND 4.7H 5V, 5A LX C8 C9 C10 22F 22F 22F CF R1 DL RESET 4.7 R3 SS N1 158k PGND EXTVCC FB C7 22000pF R8 R4 4.7 34.8k C13 0.1F 19-7665 Rev 1 6/18MAX17546 4.5V to 42V, 5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation Absolute Maximum Ratings V to PGND .........................................................-0.3V to +48V LX Total RMS Current ........................................................9.9A IN EN/UVLO, SS to SGND ........................................-0.3V to +48V 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 +53V TQFN (derate 33.3mW/C above T = +70C) ......2666.7mW A BST to LX .............................................................-0.3V to +6.5V Operating Temperature Range (Note 1) ........... -40NC to +125C BST to V ...........................................................-0.3V to +48V Junction Temperature ......................................................+150C CC FB, CF, RESET, MODE/SYNC, RT to SGND ......-0.3V to +6.5V Storage Temperature Range ............................ -65NC to +160C DL, V to PGND ................................................-0.3V to +6.5V Lead Temperature (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. Note 1: Junction temperature greater than +125C degrades operating lifetimes. 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: Junction to Ambient ( ) 23C/W (Note 2) JA Junction to Ambient ( ) 2C/W JC *EP = Exposed pad. 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 2: Applicable only to the Evaluation Kit in free space with no airflow. www.maximintegrated.com Maxim Integrated 2