EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX15035 15A Step-Down Regulator with Internal Switches General Description Features The MAX15035 pulse-width modulation (PWM) control- 4.5V to 26V Input Voltage Range ler provides high efficiency, excellent transient response, Fast Transient Response and high DC-output accuracy. Combined with the internal Monotonic Power-Up with Precharged Output low on-resistance MOSFETs, the MAX15035 provides a highly efficient and compact solution for small form factor Supports Any Output Capacitor No Compensation Required with Polymers/ applications that need a high-power density. Tantalum Maxims proprietary Quick-PWM quick-response, con- Stable with Ceramic Output Capacitors Using stant on-time PWM control scheme handles wide input/ External Compensation output voltage ratios (low-duty-cycle applications) with Dynamically Adjustable Output Voltage ease and provides 100ns instant-on response to load 0.5% V Accuracy Over Line and Load transients while maintaining a relatively constant switch- OUT ing frequency. The output voltage can be dynamically Adjustable Valley Current-Limit Protection controlled using the dynamic REFIN, which supports Thermal Compensation with NTC input voltages between 0V to 2V. The REFIN adjustability Supports Foldback Current Limit combined with a resistive voltage-divider on the feedback Programmable Switching Frequency input allows the MAX15035 to be configured for any out- Overvoltage Protection put voltage between 0V to 0.9V . IN Undervoltage Protection The controller senses the current across the synchronous rectifier to achieve a low-cost and highly efficient valley Voltage Soft-Start and Soft-Shutdown current-limit protection. External current-limit control is Power-Good Window Comparator provided to allow higher current-limit settings for appli- cations with heatsinks and air flow, or for lower current Applications applications that need lower current-limit settings to avoid Server Computers overdesigning the application circuit. The adjustable cur- GPU Core Supplies rent limit provides a high degree of flexibility, allowing DDR MemoryVDDQ or VTT thermally compensated protection or foldback current- Point-of-Load Applications limit protection using a voltage-divider partially derived Step-Down Power Supplies from the output. Storage Power Supplies The MAX15035 includes a voltage-controlled soft-start and soft-shutdown to limit the input surge current, provide a monotonic power-up into a precharged output, and provide a predictable soft-start time. The controller also Ordering Information appears at end of data sheet. includes output fault protectionundervoltage and over- voltage protectionas well as thermal-fault protection. The MAX15035 is available in a small 40-pin, 6mm x Quick-PWM is a trademark of Maxim Integrated Products, Inc. 6mm, TQFN package. 19-4123 Rev 3 4/18MAX15035 15A Step-Down Regulator with Internal Switches Absolute Maximum Ratings IN to PGND ...........................................................-0.3V to +28V BST to V ...........................................................-0.3V to +28V DD TON to GND ..........................................................-0.3V to +28V REF Short Circuit to GND .........................................Continuous V to GND ............................................................-0.3V to +6V IN RMS Current Rating (continuous) ....................................15A DD V to GND ............................................. -0.3V to (V + 0.3V) PGND RMS Current Rating (continuous)..............................20A CC DD EN, SKIP, PGOOD to GND.....................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A REF, REFIN to GND ................................. -0.3V to (V + 0.3V) 40-Pin, 6mm x 6mm Thin QFN (T4066-MCM) CC ILIM, FB to GND ....................................... -0.3V to (V + 0.3V) (derate 27mW/C above +70C) ...............................2162mW CC GND to PGND ......................................................-0.3V to +0.3V Operating Temperature Range ....................... -40C to +85C LX to PGND..............................................................-1V to +28V Junction Temperature Range ..........................................+150C BST to PGND ............................................ (V - 0.3V) to +34V Storage Temperature Range ............................ -65C to +150C DD BST to LX ................................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C 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. Package Information PACKAGE TYPE: 40-PIN TQFN Package Code T4066M+1 Outline Number 21-0177 Land Pattern Number 90-0085 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Electrical Characteristics 1 (Circuit of Figure 1, V = 12V, V = V = V = 5V, REFIN = ILIM = REF, SKIP = GND. T = 0C to +85C, unless otherwise IN DD CC EN A specified. Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range V 4.5 26.0 V IN Quiescent Supply Current (V ) I + I FB forced above REFIN 0.7 1.2 mA DD DD CC Shutdown Supply Current (V ) I EN = GND, T = +25C 0.1 2 A DD SHDN A V Undervoltage Lockout Rising edge, PWM disabled below this CC V 3.95 4.2 4.45 V UVLO(VCC) Threshold level hysteresis = 100mV V -to-V Resistance R 20 DD CC CC R = 97.5k (600kHz) 123 164 205 ns TON V = 12V, IN On-Time t V = 1.0V R = 200k (300kHz) 275 303 331 ON FB TON (Note 3) R = 302.5k (200kHz) 379 442 505 TON Minimum Off-Time t (Note 3) 225 350 ns OFF(MIN) EN = GND, V = 26V, TON TON Shutdown Supply Current 0.01 1 A V = 0V or 5V, T = +25C CC A REFIN Voltage Range V (Note 2) 0 V V REFIN REF Maxim Integrated 2 www.maximintegrated.com