MAX16961 3A, 2.2MHz, Synchronous Step-Down DC-DC Converter General Description Benefits and Features The MAX16961 is a high-efficiency, synchronous step- S Small External Components down converter that operates with a 2.7V to 5.5V input 2.2MHz Operating Frequency voltage range and provides a 0.8V to 3.6V output voltage S Ideal for Point-of-Load Applications range. The wide input/output voltage range and the ability 3A Maximum Load Current to provide up to 3A to load current make this device ideal Adjustable Output Voltage: 0.8V to 3.6V for on-board point-of-load and post-regulation applica- 2.7V to 5.5V Operating Supply Voltage tions. The device achieves -3.7%/+2.6% output error over S High Efficiency at Light Load load, line, and temperature ranges. 26A Skip Mode Quiescent Current The device features a 2.2MHz fixed-frequency PWM S Minimizes Electromagnetic Interference mode for better noise immunity and load transient Programmable SYNC I/O Pin response, and a pulse-frequency modulation mode Operates Above AM-Radio Band (skip) for increased efficiency during light-load operation. Available Spread Spectrum The 2.2MHz frequency operation allows for the use of all- S Low Power Mode Saves Energy ceramic capacitors and minimizes external components. The optional spread-spectrum frequency modulation 1A Shutdown Current minimizes radiated electromagnetic emissions. S Open-Drain Power-Good Output Integrated low R switches improve efficiency at DSON S Limits Inrush Current During Startup heavy loads and make the layout a much simpler task Soft-Start with respect to discrete solutions. S Overtemperature and Short-Circuit Protections The device can be offered with factory-preset output volt- S 16-Pin TSSOP-EP and 16-Pin (4mm x 4mm) ages, or with an adjustable output voltage (contact factory TQFN-EP Packages for preset output-voltage options). Factory-preset output- S -40C to 125C Operating Temperature Range voltage versions allow customers to achieve -3.7%/+2.6% output-voltage accuracy without using external resistors, Applications while the adjustable output-voltage version provides the flexibility to set the output voltage to any desired value Automotive Infotainment between 0.8V to 3.6V using an external resistive divider. Point-of-Load Applications Additional features include 8ms soft-start, 16ms power- Industrial/Military good output delay, overcurrent, and overtemperature protections. The MAX16961 is available in thermally enhanced Typical Application Circuit 16-pin TSSOP-EP and 16-pin (4mm x 4mm) TQFN-EP packages, and is specified for operation over the -40NC to +125NC automotive temperature range. V PV1 PV1 OUTS 0.47H 4.7F PV2 LX1 V OUT1 Ordering Information appears at end of data sheet. EN LX2 47F PGND1 V OUT1 V PGND2 PV 10 PV MAX16961 20k 1F GND PG EP For pricing, delivery, and ordering information, please contact Maxim Direct 19-6520 Rev 5 7/15 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX16961 3A, 2.2MHz, Synchronous Step-Down DC-DC Converter ABSOLUTE MAXIMUM RATINGS PV, PV1, PV2 to GND ..............................................-0.3V to +6V Continuous Power Dissipation (T = +70NC) A EN, PG to GND .......................................................-0.3V to +6V TQFN (derate 25mW/NC above +70NC)................... 2000mW* PGND1 and PGND2 to GND ..............................-0.3V to +0.3V TSSOP (derate 26.1mW/NC above +70NC)........... 2088.8mW* LX1, LX2 Continuous RMS Current Operating Temperature Range ........................ -40NC to +125NC (LX1 connected in Parallel with LX2)...................................4A Junction Temperature .....................................................+150NC Storage Temperature Range ............................ -65NC to +150NC LX Current (LX1 connected in Parallel with LX2).....Q6A (Note 5) Lead Temperature (soldering, 10s) ................................+300NC All Other Pins Voltages to GND .. (V + 0.3V) to (V - 0.3V) PV GND Soldering Temperature (reflow) ......................................+260NC Output Short-Circuit Duration ....................................Continuous *As per JEDEC51 Standard (multilayer board). Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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) TQFN TSSOP Junction-to-Ambient Thermal Resistance (B ) ..........40NC/W Junction-to-Ambient Thermal Resistance (B ) ....38.3NC/W JA JA Junction-to-Case Thermal Resistance (B ) .................6NC/W Junction-to-Case Thermal Resistance (B ) ..............3NC/W JC 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 = V = V = 5V, V = 5V, T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) PV PV1 PV2 EN A J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V Normal operation 2.7 5.5 V PV Supply Current I No load, V = 0V 12 26 45 FA PV PWM Shutdown Supply Current I V = 0V, T = +25 C 1 5 FA SHDN EN A Undervoltage-Lockout Threshold V 2.37 V UVLO L Low Undervoltage-Lockout Threshold V 2.6 V UVLO H High Undervoltage-Lockout Hysteresis 0.07 V SYNCHRONOUS STEP-DOWN DC-DC CONVERTER FB Regulation Voltage V 800 mV OUTS I = 4A -3 0 +3 LOAD Feedback Set-Point Accuracy V % OUTS I = 0A -0.5 +2 +3 LOAD V = 5V, I = 0.4A, PV1 LX pMOS On-Resistance R 34 55 mI DSON P LX1 in parallel with LX2 V = 5V, I = 0.8A, PV1 LX nMOS On-Resistance R 25 45 mI DSON N LX1 in parallel with LX2 Maximum pMOS Current-Limit I LX1 and LX2 shorted together 3.9 5.1 6.3 A LIMP1 Threshold Maxim Integrated 2