EVALUATION KIT AVAILABLE MAX5035 1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter General Description Features The MAX5035 easy-to-use, high-efficiency, high-volt- Wide 7.5V to 76V Input Voltage Range age, step-down DC-DC converter operates from an Fixed (3.3V, 5V, 12V) and Adjustable input voltage up to 76V and consumes only 270A qui- (1.25V to 13.2V) Versions escent current at no load. This pulse-width modulated (PWM) converter operates at a fixed 125kHz switching 1A Output Current frequency at heavy loads, and automatically switches Efficiency Up to 94% to pulse-skipping mode to provide low quiescent cur- Internal 0.4 High-Side DMOS FET rent and high efficiency at light loads. The MAX5035 includes internal frequency compensation simplifying 270A Quiescent Current at No Load, 10A circuit implementation. The device uses an internal low- Shutdown Current on-resistance, high-voltage, DMOS transistor to obtain Internal Frequency Compensation high efficiency and reduce overall system cost. This device includes undervoltage lockout, cycle-by-cycle Fixed 125kHz Switching Frequency current limit, hiccup mode output short-circuit protec- Thermal Shutdown and Short-Circuit Current tion, and thermal shutdown. Limit The MAX5035 delivers up to 1A output current. The out- 8-Pin SO and PDIP Packages put current may be limited by the maximum power dis- sipation capability of the package. External shutdown is Ordering Information included, featuring 10A (typ) shutdown current. The Ordering Information MAX5035A/B/C versions have fixed output voltages of OUTP UT 3.3V, 5V, and 12V, respectively, while the MAX5035D/E PIN- PART TEMP RANGE VOLTA GE versions have an adjustable output voltage from 1.25V PACKAGE ( V) to 13.2V. MAX5035AUSA 0C to +85C 8 SO The MAX5035 is available in space-saving 8-pin SO MAX5035AUPA 0C to +85C 8 PDIP and 8-pin plastic DIP packages and operates over the 3.3 automotive (-40C to +125C) temperature range. MAX5035AASA -40C to +125C 8 SO M AX5035A ASA/ V+ -40C to +125C 8 SO Applications MAX5035BUSA 0C to +85C 8 SO MAX5035BUPA 0C to +85C 8 PDIP Functional Diagrams Automotive 5.0 MAX5035BASA -40C to +125C 8 SO Consumer Electronics M AX5035B ASA/ V+ -40C to +125C 8 SO Industrial /V denotes an automotive qualified part. Distributed Power +Denotes a lead(Pb)-free/RoHS-compliant package. Ordering Information continued at end of data sheet. Typical Operating Circuit Pin Configuration V IN 7.5V TO 76V V TOP VIEW 68F IN BST 0.1F 100H MAX5035 V OUT BST 1 8 LX LX R1 5V D1 50SQ100 VD 2 7 V IN MAX5035 ON/OFF 68F SGND 3 6 GND ON FB R2 VD FB 4 5 ON/OFF OFF SGND GND 0.1F Pin Configurations appear at end of data sheet. SO/PDIP Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-2988 Rev 5 5/11 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLEMAX5035 1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND, unless otherwise specified.) VD Short-Circuit Duration ..............................................Indefinite V .........................................................................-0.3V to +80V Continuous Power Dissipation (T = +70C) IN A SGND ....................................................................-0.3V to +0.3V 8-Pin PDIP (derate 9.1mW/C above +70C)...............727mW LX.................................................................-0.8V to (V + 0.3V) 8-Pin SO (derate 5.9mW/C above +70C)..................471mW IN BST ...............................................................-0.3V to (V + 10V) Operating Temperature Range IN BST (transient < 100ns)................................-0.3V to (V + 15V) MAX5035 U ...................................................0C to +85C IN BST to LX................................................................-0.3V to +10V MAX5035 A ..............................................-40C to +125C BST to LX (transient < 100ns) ................................-0.3V to +15V Storage Temperature Range .............................-65C to +150C ON/OFF ..................................................................-0.3V to +80V Junction Temperature......................................................+150C VD...........................................................................-0.3V to +12V Lead Temperature (soldering, 10s) .................................+300C FB Soldering Temperature (reflow) MAX5035A/MAX5035B/MAX5035C ...................-0.3V to +15V Lead(Pb)-free...............................................................+260C MAX5035D/E ......................................................-0.3V to +12V Containing lead(Pb).....................................................+240C V Short-Circuit Duration (V 40V)........................Indefinite OUT IN 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 (MAX5035 U ) (V = +12V, V = +12V, I = 0, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C. See the IN ON/OFF OUT A A Typical Application Circuit.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX5035A 7.5 76.0 MAX5035B 7.5 76.0 Input Voltage Range V V IN MAX5035C 15 76 MAX5035D/E 7.5 76.0 Undervoltage Lockout UVLO 5.2 V V = 7.5V to 76V, IN MAX5035A 3.185 3.3 3.415 I = 20mA to 1A OUT V = 7.5V to 76V, IN Output Voltage V MAX5035B 4.85 5.0 5.15 V OUT I = 20mA to 1A OUT V = 15V to 76V, IN MAX5035C 11.64 12 12.36 I = 20mA to 1A OUT V = 7.5V to 76V, MAX5035D/E 1.192 1.221 1.250 IN Feedback Voltage V V FB V = 7.5V to 76V, MAX5035E 1.185 1.221 1.250 IN V = 12V, I = 0.5A, MAX5035A 86 IN LOAD V = 12V, I = 0.5A, MAX5035B 90 IN LOAD Efficiency V = 24V, I = 0.5A, MAX5035C 94 % IN LOAD V = 12V, V = 5V, I = 0.5A, IN OUT LOAD 90 MAX5035D/E V = 3.5V, V = 7.5V to 76V, MAX5035A 270 440 FB IN V = 5.5V, V = 7.5V to 76V, MAX5035B 270 440 FB IN Quiescent Supply Current I V = 13V, V = 15V to 76V, MAX5035C 270 440 A Q FB IN V = 1.3V, MAX5035D 270 440 FB V = 1.3V, MAX5035E 340 460 FB Shutdown Current I V = 0V, V = 7.5V to 76V 10 45 A SHDN ON/OFF IN Peak Switch Current Limit I (Note 1) 1.30 1.9 2.50 A LIM 2 Maxim Integrated