MAX17506 4.5V60V, 5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation General Description Benefits and Features The MAX17506 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 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. Redu ce Number of DC-DC Regulators to Stock The MAX17506 uses peak current-mode control. The Wide 4.5V to 60V Input device can be operated in the pulse-width modulation Adjustable 0.9V to 0.9 x V Output IN (PWM), pulse-frequency modulation (PFM), and 100kHz to 2.2MHz Adjustable Switching Frequency discontinuous conduction mode (DCM) control schemes. with External Synchronization The device is available in a 20-pin (5mm x 5mm) Thin Redu ces Power Dissipation QFN (TQFN) package. Simulation models are available. Peak Efficiency > 95% PFM/DCM Modes Enables Enhanced Light-Load Applications Efficiency Industrial Power Supplies Auxiliary Bootstrap LDO for Improved Efficiency Distributed Supply Regulati on 3.5FA 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 Ordering Information appears at end of data sheet. Monotonic Startup into Prebiased Load Overtemperature Protection -40NC to +125NC Operation Typical Application Circuit for 5V Output VIN 7.5V-60V C1 C2 2.2 F 2.2 F EN/UVLO VIN VIN VIN VIN RT BST MODE/SYNC C11 VCC 0.1 F VOUT LX L1 5V, 5A C6 MAX17506 LX 2.2 F SGND 4.7 H LX C8 C9 C10 CF R3 22 F 22 F 22 F DL N1 158k RESET SS PGND EXTVCC FB C7 0.022 F R4 34.8k L1 = XAL8080-472 F = 450kHz SW N1 = RJK0651DPB 19-7453 Rev 1 5/15MAX17506 4.5V60V, 5A, 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 ......................... -40NC 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 ............................ -65NC 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 Thermal Characteristics TQFN Junction-to-Ambient Thermal Resistance ( ) ...................... Junction-to-Case Thermal Resistance ( ) .....................2C/W JA JC ...................................................................... 23C/W (Note 1) Note 1: Applicable only to the Evaluation Kit in free space with no airflow. Electrical Characteristics (V = V = 24V, R = OPEN (450kHz), C = 2.2F, V = V = V / = 0V, LX = SS = RESET = open, IN EN/UVLO RT VCC PGND SGND MODE SYNC V to V = 5V, V = 1V, T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are BST LX FB A J 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) 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 LDO 6V < V < 60V, I = 1mA IN VCC V Output Voltage Range V 4.75 5 5.25 V CC CC 1mA I 45mA VCC V Current Limit I V = 4.3V, V = 6V 50 90 140 mA CC VCC-MAX CC IN V Dropout V V = 4.5V, I = 45mA 4.1 V CC CC-DO IN VCC www.maximintegrated.com Maxim Integrated 2