EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX17682 4.5V to 42V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter General Description Benefits and Features The MAX17682 is a high-voltage, high-efficiency, iso-buck Eliminates External Components and Reduces Total DC-DC converter designed to provide isolated power up Cost to 10W. The device operates over a wide 4.5V to 42V Synchronous Primary Operation for High Efficiency input voltage range and uses primary-side feedback and Reduced Cost to regulate the output voltage. It delivers primary peak All-Ceramic Capacitors, Ultra-Compact Layout current up to 3.7A and regulates primary output voltage to Reduces Number of DC-DC Regulators to Stock within 1.2% over -40C to +125C. Wide 4.5V to 42V Input Voltage Range The device features peak-current-mode control with 0.9V to 92% V Primary Output Voltage IN pulse-width modulation (PWM) scheme. The low-resis- Delivers up to 3.7A Peak Current tance, on-chip MOSFETs ensure high efficiency at full 100kHz to 500kHz Adjustable Frequency with load and simplify the layout. External Synchronization Available in a 20-Pin, 4mm x 4mm TQFN Package A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an Reduces Power Dissipation output enable/undervoltage lockout pin (EN/UVLO) that Peak Efficiency > 90% allows the user to turn on the part at the desired input- Shutdown Current = 2.8A (typ) voltage level. An open-drain RESETB pin provides a Operates Reliably in Adverse Industrial Environments delayed power-good signal to the system upon achieving Hiccup-Mode Current Limit, Sink Current Limit, and successful regulation of the primary output voltage. Auto-Retry Startup The device operates over the -40C to +125C industrial Programmable EN/UVLO Threshold temperature range and is available in a compact 20-pin Adjustable Soft-Start (4mm x 4mm) TQFN package. Simulation models are High Industrial -40C to +125C Ambient Operating available. Temperature Range -40C to +150C Junction Temperature Range Applications Industrial Process Control Communication Hub in Smart meters Ordering Information appears at end of data sheet. Isolated Power Supplies in Medical Equipment Floating Power Supply Generation 19-8639 Rev 1 4/18MAX17682 4.5V to 42V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter Absolute Maximum Ratings V to PGND .........................................................-0.3V to +48V FB to SGND .........................................................-0.3V to +1.5V IN EN/UVLO to PGND ...............................................-0.3V to +42V SGND to PGND.................................................... -0.3V to +0.3V LX to PGND................................................-0.3V to (V + 0.3V) LX Total RMS Current ...........................................................4A IN BST to PGND .................................................-0.3V to (LX + 5V) Output Short-Circuit Duration ....................................Continuous BST to LX .............................................................-0.3V to +6.5V Junction Temperature ......................................................+150C BST to V ...........................................................-0.3V to +42V Storage Temperature Range ............................ -65C to +160C CC Lead Temperature (soldering, 10s) .................................+300C V , SYNC, RESETB, COMP, SS, RT to SGND CC Soldering Temperature (reflow) .......................................+260C ..........................................................................-0.3V to +6.5V 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. Junction temperature greater than +125C degrades operating lifetimes. (Note 1) Package Thermal Characteristics 20 TQFN Continuous Power Dissipation (T = +70C) (derate Junction-to-Ambient Thermal Resistance ( ) ..........33C/W A JA 30.3mW/C above +70C) (multilayer board) .........2424.2mW Junction-to-Case Thermal Resistance ( ) .................2C/W JC Note 1: 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. Electrical Characteristics (V = V = 24V, R = 82.5k (250kHz), V = V = V = 0V, C = 2.2F, V = 1V, V = 5V, LX = RESETB IN EN RT SGND PGND SYNC VCC FB BST to LX = SS = COMP = unconnected. T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are A A referenced to SGND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (VIN) Input Voltage Range V 4.5 42 V IN Input Quiescent Current I V = 0V, shutdown mode 2.8 4.5 A IN-SH EN Input Quiescent Current I 1.16 1.8 mA Q Input Switching Current I V = 0.8V 6 mA SW FB ENABLE/UVLO (EN/UVLO) V V rising 1.19 1.215 1.26 ENR EN EN Threshold V V falling 1.068 1.09 1.131 V ENF EN V V falling, true shutdown 0.8 EN-TRUESD EN EN Input Leakage Current I V = V = 60V, T = +25C -50 0 +50 nA EN EN IN A LDO 6V < V < 42V, I = 1mA IN VCC V Output Voltage Range V 4.75 5 5.25 V CC CC 1mA < I < 25mA VCC V Current Limit I V = 4.3V, V = 6V 26.5 55 100 mA CC VCC-MAX CC IN V Dropout V V = 4.5V, I = 20mA 4.2 V CC CC-DO IN VCC V V rising 4.05 4.2 4.3 CC-UVR CC V UVLO V CC V V falling 3.65 3.8 3.9 CC-UVF CC Maxim Integrated 2 www.maximintegrated.com