EVALUATION KIT AVAILABLE MAX5090A/B/C 2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters General Description Features The MAX5090A/B/C easy-to-use, high-efficiency, high- Wide Input Voltage Range: 6.5V to 76V voltage step-down DC-DC converters operate from an input Fixed (3.3V, 5V) and Adjustable (1.265V to 11V) voltage up to 76V, and consume only 310A quiescent Output-Voltage Versions current at no load. This pulse-width-modulated (PWM) 2A Output Current converter operates at a fixed 127kHz switching frequency at Efficiency Up to 92% heavy loads, and automatically switches to pulse-skipping mode to provide low quiescent current and high efficiency Internal 0.26 High-Side DMOS FET at light loads. The MAX5090 includes internal frequency 310A Quiescent Current at No Load compensation simplifying circuit implementation. The 19A Shutdown Current device can also be synchronized with external system clock Internal Frequency Compensation frequency in a noise-sensitive application. The MAX5090 uses an internal low on-resistance and a high-voltage DMOS Fixed 127kHz Switching Frequency transistor to obtain high efficiency and reduce overall system External Frequency Synchronization cost. This device includes undervoltage lockout, cycle- Thermal Shutdown and Short-Circuit Current Limit by-cycle current limit, hiccup-mode output short-circuit -40C to +125C Automotive Temperature Range protection, and overtemperature shutdown. 6-Pin (5mm x 5mm) Thin QFN Package The MAX5090 delivers up to 2A output current. External shutdown is included, featuring 19A (typ) shutdown Capable of Dissipating 2.67W at +70C current. The MAX5090A/MAX5090B versions have fixed output voltages of 3.3V and 5V, respectively, while the Ordering Information MAX5090C features an adjustable 1.265V to 11V output OUTPUT voltage. TEMP PIN- PART VOLTAGE RANGE PACKAGE (V) The MAX5090 is available in a space-saving 16-pin thin QFN package (5mm x 5mm) and operates over the MAX5090AATE+ -40C to +125C 16 TQFN-EP* 3.3 automotive temperature range (-40C to +125C). MAX5090AATE -40C to +125C 16 TQFN-EP* 3.3 MAX5090BATE+ -40C to +125C 16 TQFN-EP* 5.0 Applications MAX5090BATE -40C to +125C 16 TQFN-EP* 5.0 Industrial +Denotes a lead(Pb)-free/RoHS-compliant package. Distributed Power *EP = Exposed pad. Ordering Information continued at end of data sheet. Typical Operating Circuit Pin Configuration V IN TOP VIEW 7.5V TO 76V R IN 12 11 10 9 10 C IN C BYPASS 68F 0.47F V OUT DRAIN 13 EP 8 FB 100H V DRAIN 5V/2A IN LX DRAIN 14 7 SS ON/OFF C BST COUT D1 MA5090 0.22F 100F PDS5100H MAX5090B N.C. 15 6 SYNC BST FB VD N.C. 16 5 SS SYNC CSS 0.047F VD 1 2 3 4 SGND PGND 3.3F TQFN 19-3872 Rev 1 9/14 LX PGND LX N.C. BST SGND V ON/OFF INMAX5090A/B/C 2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters Absolute Maximum Ratings (Voltages referenced to PGND, unless otherwise specified.) V Short-Circuit Duration ......................................Continuous OUT V , DRAIN ............................................................-0.3V to +80V VD Short-Circuit Duration ..........................................Continuous IN SGND, PGND.....................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C)* A LX ...............................................................-0.8V to (V + 0.3V) 16-Pin TQFN (derate 33.3mW/C above +70C) ........2.667W IN BST ..............................................................-0.3V to (V + 10V) Operating Junction Temperature Range ...... -40C to +125C IN BST to LX ..............................................................-0.3V to +10V Storage Temperature Range ........................ -65C to +150C ON/OFF ......................................................-0.3V to (V + 0.3V) Junction Temperature ..................................................+150C IN VD, SYNC .............................................................-0.3V to +12V Lead Temperature (soldering, 10s) .............................+300C SS .............................................................................. -0.3 to +4V FB *As per JEDEC 51 Standard Multilayer Board. MAX5090A/MAX5090B .....................................-0.3V to +15V MAX5090C ................ 1mA (internally clamped to +2V, -0.3V) 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 = +12V, V = +12V, V = 0V, I = 0, T = T = -40C to +125C, unless otherwise noted. Typical values are at IN ON/OFF SYNC OUT A J T = +25C. See the Typical Operating Circuit.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 6.5 76.0 V IN Undervoltage Lockout UVLO V rising 5.70 6.17 6.45 V IN UVLO Hysteresis UVLO 0.5 V HYS MAX5090A V = 6.5V to 76V, I = 0 to 2A 3.20 3.3 3.39 IN OUT Output Voltage V MAX5090B V = 7.5V to 76V, I = 0 to 2A 4.85 5.0 5.15 V OUT IN OUT MAX5090B V = 7V to 76V, I = 0 to 1A 4.85 5.0 5.15 IN OUT Output Voltage Range V MAX5090C only 1.265 11.000 V OUT Feedback Voltage V MAX5090C, V = 6.5V to 76V 1.191 1.228 1.265 V FB IN MAX5090A V = 12V, I = 1A 80 IN OUT Efficiency MAX5090B V = 12V, I = 1A 88 % IN OUT MAX5090C V = 12V, V = 5V, I = 1A 88 IN OUT OUT MAX5090A V = 6.5V to 28V 310 550 IN Quiescent Supply Current I MAX5090B V = 7V to 28V 310 550 A Q IN (Note 2) MAX5090C V = 6.5V to 28V 310 550 IN MAX5090A V = 6.5V to 40V 310 570 IN Quiescent Supply Current I MAX5090B V = 7V to 40V 310 570 A Q IN (Note 2) MAX5090C V = 6.5V to 40V 310 570 IN MAX5090A V = 6.5V to 76V 310 650 IN Quiescent Supply Current I MAX5090B V = 7V to 76V 310 650 A Q IN (Note 2) MAX5090C V = 6.5V to 76V 310 650 IN Shutdown Current I V = 0V, V = 14V 19 45 A SHDN ON/OFF IN SOFT-START Default Internal Soft-Start C = 0 700 s SS Period Soft-Start Charge Current I 4.5 10 16.0 A SS Soft-Start ReferenceVoltage V 1.23 1.46 1.65 V SS(REF) Maxim Integrated 2 www.maximintegrated.com