EVALUATION KIT AVAILABLE MAX15020 2A, 40V Step-Down DC-DC Converter with Dynamic Output-Voltage Programming General Description Features Wide 7.5V to 40V Input Voltage Range The MAX15020 high-voltage step-down DC-DC converter operates over an input voltage range of 7.5V to 40V. The 2A Output Current, Up to 96% Efficiency device integrates a 0.2 high-side switch and is capable Dynamic Programmable Output Voltage (0.5V to 36V) of delivering 2A load current with excellent load and line Maximum Duty Cycle of 95% (typ) at 300kHz regulation. The output is dynamically adjustable from 100kHz to 500kHz Synchronizable SYNC Frequency 0.5V to 36V through the use of an external reference Range input (REFIN). The MAX15020 consumes only 6A in Configurable UVLO and Soft-Start shutdown mode. Low-Noise, Voltage-Mode Step-Down Converter The device utilizes feed-forward voltage-mode architecture for good noise immunity in the high-voltage switching envi- Programmable Output-Voltage Slew Rate ronment and offers external compensation for maximum Lossless Constant Current Limit with Fixed flexibility. The switching frequency is selectable to 300kHz Timeout to Hiccup Mode or 500kHz and can be synchronized to an external clock Extremely Low-Power Consumption (< 6A typ) in signal of 100kHz to 500kHz by using the SYNC input. The Shutdown Mode IC features a maximum duty cycle of 95% (typ) at 300kHz. 20-Pin (5mm x 5mm) Thin QFN Package The device includes configurable undervoltage lockout (UVLO) and soft-start. Protection features include cycle- by-cycle current limit, hiccup-mode for output short-circuit Ordering Information protection, and thermal shutdown. The MAX15020 is avail- PART TEMP RANGE PIN-PACKAGE able in a 20-pin TQFN 5mm x 5mm package and is rated MAX15020ATP+ -40C to +125C 20 TQFN-EP* for operation over the -40C to +125C temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Applications *EP = Exposed pad. Printer Head Driver Power Supply Industrial Power Supply Step-Down Power Supply Pin Configuration appears at end of data sheet. Typical Operating Circuit V IN (7.5V TO 40V) REG DVREG IN BST ON/OFF V OUT (0.5V TO 36V) LX REFOUT MAX15020 FB PWM REFIN INPUT EP SS SYNC GND FSEL PGND COMP 19-0811 Rev 2 4/14MAX15020 2A, 40V Step-Down DC-DC Converter with Dynamic Output-Voltage Programming Absolute Maximum Ratings IN, ON/OFF to GND..........................................-0.3V to +45V Continuous Power Dissipation (T = +70C) A LX to GND................................................-0.715V to (V + 0.3V) 20-Pin Thin QFN, single-layer board (5mm x 5mm) IN BST to GND .................................................-0.3V to (V + 12V) (derate 21.3mW/C above +70C)..........................1702.1mW IN BST to LX................................................................-0.3V to +12V 20-Pin Thin QFN, multilayer board (5mm x 5mm) PGND, EP to GND.................................................-0.3V to +0.3V (derate 34.5mW/C above +70C)..........................2758.6mW REG, DVREG, SYNC to GND ................................-0.3V to +12V Maximum Junction Temperature .....................................+150C FB, COMP, FSEL, REFIN, REFOUT, Storage Temperature Range ............................-60C to +150C SS to GND .........................................-0.3V to (VREG + 0.3V) Lead Temperature (soldering, 10s) ................................+300C Continuous Current through Internal Power MOSFET T = +125C..........................................................................4A J T = +150C.......................................................................2.7A J 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. Electrical Characteristics (V = 36V, V = V , V = V = V = 0V, V = 0V, C = 0.1F, T = T = -40C to +125C, FSEL = REG, IN REG DVREG PGND GND EP SYNC REFOUT A J unless otherwise noted. Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 7.5 40.0 V IN UVLO Rising Threshold UVLO 6.80 7.20 7.45 V RISING UVLO Falling Threshold UVLO 6.0 6.5 7.0 V FALLING UVLO Hysteresis UVLO 0.7 V HYST Quiescent Supply Current V = 40V, V = 1.3V 1.6 2.8 mA IN FB Switching Supply Current V = 40V, V = 0V 14.5 mA IN FB Shutdown Current I V = 0.2V, V = 40V 6 15 A SHDN ON/OFF IN ON/OFF CONTROL Input-Voltage Threshold V V rising 1.200 1.225 1.270 V ON/OFF ON/OFF Input-Voltage Threshold 120 mV Hysteresis Input Bias Current V = 0V to V -250 +250 nA ON/OFF IN Shutdown Threshold Voltage V 0.2 V SD INTERNAL VOLTAGE REGULATOR (REG) Output Voltage I = 0 to 20mA 7.1 8.3 V REG OSCILLATOR V = 0V 450 550 FSEL Frequency f kHz SW V = V 270 330 FSEL REG V = 0V 85 FSEL Maximum Duty Cycle D % MAX V = V 90 FSEL REG SYNC/FSEL High-Level 2 V Voltage SYNC/FSEL Low-Level 0.8 V Voltage SYNC Frequency Range f V = V 100 550 kHz SYNC FSEL REG Maxim Integrated 2 www.maximintegrated.com