MAX17501 60V, 500mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter General Description Benefits and Features Eliminates External Compo nents and Reduce Total The MAX17501 high-efficiency, high-voltage, synchro nous Cost step-down DC-DC converter with integrated MOSFETs No Schottky-Synchronou s Operation for High operates over a 4.5V to 60V input voltage range. It deliv- Efficiency and Reduced Cost ers output currents up to 500mA at output voltages of 0.9V to 92%V . The output voltage is accurate to within Internal Compensation and Feedback Divider for IN 1.7% over -40C to +125C. The MAX17501 is avail- 3.3V and 5V Outputs able in a compact TDFN package. Simulation models are All-Ceramic Capacitors, Ultra-Compact Layout available. Redu ces Number of DC-DC Regulators to Stock The device features peak-current-mode control with Wide 4.5V to 60V Input Voltage Range pulse-width modulation (PWM). Users can choose devic- 0.9V to 92%V Output Voltage IN es with either pulse frequency modulation (PFM) or forced Delivers up to 500mA PWM scheme. PFM devices skip pulses at light load for 600kHz and 300kHz Switching Frequency Options higher efficiency, while forced-PWM devices operate with Available in a 10-Pin, 3mm x 2mm TDFN Package fixed switching frequency at any load for noise sensi- Redu ces Power Dissipation tive-applications. The low-resistance, on-chip MOSFETs Peak Efficiency > 90% ensure high efficiency at full load and simplify the layout. PFM Feature for High Light-Load Efficiency A programmable soft-start feature allows users to reduce Shutdown Current = 0.9A (typ) input inrush current. The device also incorporates an Operates Reliably in Adverse Industrial Environments output enable/undervoltage lockout pin (EN/UVLO) that Hiccup-M ode Current Limit, Sink Current Limit, allows the user to turn on the part at the desired input- voltage level. An open-drain RESET pin provides a and Autoretry Startup Built-In Output-Voltage Monitoring (Open-Drain delayed power-good signal to the system upon achieving successful regulation of the output voltage. RESET Pin) Resistor-Programmable EN/UVLO Threshold Applications Adjustable Soft-Start and Prebiased Power-Up -40C to +125C Industrial Temperature Range Industrial Process Control HVAC and Building Control Ordering Information appears at end of data sheet. Base Station, VOIP, Telecom Home Theatre For related parts and recommended products to use with this part, refer Automotive to www.maximintegrated.com/MAX17501.related. Battery-Powered Equipmen t General-Purpose Point-of-L oad 19-6244 Rev 2 1/13MAX17501 60V, 500mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Absolute Maximum Ratings V to GND.............................................................-0.3V to +70V Continuous Power Dissipation (T = +70C) IN A EN/UVLO to GND.......................................-0.3V to (V + 0.3V) (derate 14.9mW/C above +70C) (multilayer board) .1188.7mW IN LX to PGND................................................-0.3V to (V + 0.3V) Operating Temperature Range......................... -40C to +125C IN FB, RESET, COMP, SS to GND .............................-0.3V to +6V Junction Temperature......................................................+150C V to GND..............................................................-0.3V to +6V Storage Tempera ture Range............................. -65C to +160C CC GND to PGND.......................................................-0.3V to +0.3V Lead Temperature (soldering, 10s).................................+300C LX Total RMS Current......................................................... 1.6A Soldering Temperature (reflow).......................................+260C Output Short-Circuit Duration.....................................Continuous 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) TDFN 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 = C = 1F, V = 1.5V, C = 3300pF, V = 0.98 x V , LX = unconnected, RESET IN GND PGND VIN VCC EN SS FB OUT = unconnected. T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced to A J A GND, 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 I V = 0V, shutdown mode 0.9 3.5 IN-SH EN A I V = 1.03 x V , MAX17501A/B 90 145 IN-HIBERNATE FB OUT Input Supply Current Normal MAX17501E/F/G 4.75 6.75 I switching mode, mA IN-SW MAX17501H 2.5 3.6 no load 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 = 60V, 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 < 60V, 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