MAX17542G 42V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter General Description Benefits and Features Redu ces External Compon ents and Total Cost The MAX17542G high-efficiency, high-voltage, synchronous No Schottky-Synchronous Operation step-down DC-DC converter with integrated MOSFETs operates over 4.5V to 42V input. The converter can A ll-Ceram ic Capa citors, Ultra-Co mpact Layout deliver up to 1A and generates output voltages from 0.9V Redu ces Number of DC-DC Regulators to Stock up to 0.92 x V . The feedback (FB) voltage is accurate to IN Wide 4.5V to 42V Input within 1.7% over -40C to +125C. Adjustable 0.9V to 92%V Output IN The MAX17542G uses peak-current-mode control with Delivers up to 1A pulse-width modulation (PWM) and operates with fixed Redu ces Power Dissipation 600kHz switching frequency at any load. The device Peak Efficiency > 90% is available in a 10-pin (3mm x 2mm) TDFN package. Shutdown Current = 0.9A (typ) Simulation models are available. Operates Reliably in Adverse Industrial Environments Hiccup-M ode Current Limit, Sink Current Limit, Applications and Autoretry Startup Industrial Process Control Built-In Output-Voltage Monitoring (RESET Pin) HVAC and Building Control Programmable EN/UVLO Threshold Base Station, VOIP, Telecom Adjustable Soft-Start and Prebiased Power-Up Home Theatre -40C to +125C Operation Battery-Powered Equipmen t General-Purpose Point of L oad Ordering Information appears at end of data sheet. MAX17542G Application Circuit (5V Output, 1A Maximum Load Current) L1 22H V OUT V IN V LX IN 5V, 1A C1 C4 R1 2.2F 10F 3.32M 1 PGND JU1 2 EN/UVLO 3 R2 R4 MAX17542G 681k 82.5k GND V CC C2 1F FB/VO SS C3 R5 3300pF 18.2k COMP RESET RESET R3 C9 16.5k 27pF C5 4700pF 19-7531 Rev 0 3/15MAX17542G 42V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Absolute Maximum Ratings V to GND.............................................................-0.3V to +48V Output Short-Circuit Duration.....................................Continuous IN EN/UVLO to GND.......................................-0.3V to (V + 0.3V) Operating Temperature Range......................... -40C to +125C IN LX to PGND................................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C IN FB, RESET, COMP, SS to GND .............................-0.3V to +6V Storage Tempera ture Range............................. -65C to +160C V to GND..............................................................-0.3V to +6V Lead Temperatur e (soldering, 10s).................................+300C CC GND to PGND.......................................................-0.3V to +0.3V Soldering Temperature (reflow).......................................+260C LX Total RMS Current......................................................... 1.6A 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 (Note 1) 10 TDFN Continuous Power Dissipation (T = +70C) A (derate 14.9mW/C above +70C) (multilayer board) .1188.7mW Junction-to-Ambient Thermal Resistance ( ) ...........67.3C/W JA Junction-to-Case Thermal Resistance ( ) ................18.2C/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 = 24V, V = V = 0V, C = 2.2F, C = 1F, V = 1.5V, C = 3300pF, V = 0.98 x V , LX = unconnected, IN GND PGND VIN VCC EN SS FB OUT RESET = unconnected. T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced A J A to GND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (V ) IN Input Voltage Range V 4.5 42 V IN I V = 0V, shutdown mode 0.9 3.5 A IN-SH EN Input Supply Current I Normal switching mode, no load 4.75 6.75 mA IN-SW ENABLE/UVLO (EN/UVLO) V V rising 1.194 1.218 1.236 ENR EN EN Threshold V V falling 1.114 1.135 1.156 V ENF EN V V falling, true shutdown 0.7 EN-TRUESD EN EN Input Leakage Current I V = V = 42V, T = +25C 8 200 nA EN EN IN A LDO 6V < V < 12V, 0mA < I < 10mA, IN VCC V Output Voltage Range V 4.65 5 5.35 V CC CC 12V < V < 42V, 0mA < I < 2mA IN VCC V Current Limit I V = 4.3V, V = 12V 15 40 80 mA CC VCC-MAX CC IN V Dropout V V = 4.5V, I = 5mA 4.1 V CC CC-DO IN VCC V V rising 3.85 4 4.15 CC-UVR CC V UVLO V CC V V falling 3.55 3.7 3.85 CC-UVF CC Maxim Integrated 2 www.maximintegrated.com