EVALUATION KIT AVAILABLE MAX5082/MAX5083 1.5A, 40V, MAXPower Step-Down DC-DC Converters General Description Features 4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083) The MAX5082/MAX5083 are 250kHz PWM step-down Input Voltage Range DC-DC converters with an on-chip, 0.3 high-side switch. The input voltage range is 4.5V to 40V for the 1.5A Output Current MAX5082 and 7.5V to 40V for the MAX5083. The output V Range From 1.23V to 32V OUT is adjustable from 1.23V to 32V and can deliver up to Internal High-Side Switch 1.5A of load current. Fixed 250kHz Internal Oscillator Both devices utilize a voltage-mode control scheme for Automatic Switchover to Pulse-Skip Mode at Light good noise immunity in the high-voltage switching envi- Loads ronment and offer external compensation allowing for External Frequency Synchronization maximum flexibility with a wide selection of inductor values and capacitor types. The switching frequency is internally Thermal Shutdown and Short-Circuit Protection fixed at 250kHz and can be synchronized to an external Operates Over the -40C to +125C Temperature clock signal through the SYNC input. Light load efficiency is Range improved by automatically switching to a pulse-skip mode. Space-Saving (5mm x 5mm) High-Power 16-Pin All devices include programmable undervoltage lockout and TQFN Package soft-start. Protection features include cycle-bycycle current Ordering Information limit, hiccup-mode output short-circuit protection, and ther- mal shutdown. Both devices are available in a space-saving, PART TEMP RANGE PIN-PACKAGE high-power (2.7W), 16-pin TQFN package and are rated for MAX5082ATE -40C to +125C 16 TQFN-EP* operation over the -40C to +125C temperature range. MAX5083ATE -40C to +125C 16 TQFN-EP* Applications *EP = Exposed pad. FireWire Power Supplies Industrial Distributed Power Pin Configurations appears at end of data sheet. 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Typical Application Circuits V IN C D1 F 4.5V TO 40V C BST IN DVREG C- C+ BST L1 R1 LX V OUT C6 REG C1 MAX5082 R3 C5 D2 R6 ON/OFF FB C8 SYNC SGND PGND SS COMP R2 R4 C7 R5 C C2 SS PGND PGND Typical Operating Circuits continued at end of data sheet. 19-3657 Rev 1 5/14MAX5082/MAX5083 1.5A, 40V, MAXPower Step-Down DC-DC Converters Absolute Maximum Ratings IN, ON/OFF to SGND..............................................-0.3V to +45V T = +125C.........................................................................3A J LX to SGND.................................................-0.3V to (V + 0.3V) T = +150C.........................................................................2A IN J BST to SGND................................................-0.3V to (V + 12V) Continuous Power Dissipation* (T = +70C) IN A BST to LX................................................................-0.3V to +12V 16-Pin TQFN (derate 33.3mW/C above +70C)....2666.7mW PGND to SGND.....................................................-0.3V to +0.3V 16-Pin TQFN ( ).......................................................30C/W JA REG, DVREG, SYNC to SGND...............................-0.3V to +12V 16-Pin TQFN ( )......................................................1.7C/W JC FB, COMP, SS to SGND..........................-0.3V to (V + 0.3V) Operating Temperature Range...........................-40oC to +125C REG C+ to PGND (MAX5082 only)..............(V - 0.3V) to +12V Maximum Junction Temperature.......................................+150C DVREG C- to PGND (MAX5082 only)..............-0.3V to (V + 0.3V) Storage Temperature Range..............................-60C to +150C DVREG Continuous current through internal power MOSFET (pins 11/12 Lead Temperature (soldering, 10s)...................................+300C connected together and pins 13/14 connected together) *As per JEDEC 51 Standard. 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 = V = 12V, V = V , V = PGND = SGND, T = T = -40C to +125C, unless otherwise noted. Typical values IN ON/OFF REG DVREG SYNC A J are at T = + 25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX5082 4.5 40 Input Voltage Range V V IN MAX5083 7.5 40 V rising, MAX5082 3.9 4.2 IN Undervoltage Lockout Threshold UVLO V V rising, MAX5083 6.8 7.3 IN MAX5082 0.4 Undervoltage Lockout Hysteresis UVLO V HYST MAX5083 0.7 V = 0V, MAX5082 10.5 Switching Supply Current (PWM FB I mA SW Operation) V = 0V, MAX5083 9.5 FB V = 12V, V = 3.3V, I = 1.5A 84 IN OUT OUT Efficiency % V = 4.5V, V = 3.3V, I = 1.5A IN OUT OUT 88 (MAX5082) MAX5082 1.4 2.5 No-Load Supply Current mA (PFM Operation) MAX5083 1.3 2.3 A Shutdown Current I V = 0V, V = 40V 200 300 SHDN ON/OFF IN ON/OFF CONTROL Input Voltage Threshold V V rising 1.20 1.23 1.25 V ON/OFF ON/OFF Input Voltage Hysteresis 0.12 V Input Bias Current V = 0 to 40V -250 +250 nA ON/OFF ERROR AMPLIFIER/SOFT-START Soft-Start Current I 8 15 24 A SS Reference Voltage (Soft-Start) V 1.215 1.228 1.240 V SS FB Regulation Voltage V I = -500A to +500A 1.215 1.228 1.240 V FB COMP FB Input Range 0 1.5 V FB Input Current -250 +250 nA COMP Voltage Range I = -500A to +500A 0.25 4.50 V COMP Open-Loop Gain 80 dB Unity-Gain Bandwidth 1.8 MHz FB Offset Voltage I = -500A to +500A -5 +5 mV COMP Maxim Integrated 2 www.maximintegrated.com