MAX15040 19-4426 Rev 2 7/10 High-Efficiency, 4A, Step-Down Regulator with Integrated Switches in 2mm x 2mm Package General Description Features The MAX15040 high-efficiency switching regulator Internal 15m R MOSFETs DS(ON) delivers up to 4A load current at output voltages from Continuous 4A Output Current 0.6V to (0.9 x V ). The device operates from 2.4V to IN 1% Output-Voltage Accuracy Over Load, Line, 3.6V, making it ideal for on-board point-of-load and and Temperature postregulation applications. Total output-voltage accu- racy is within 1% over load, line, and temperature. Operates from 2.4V to 3.6V Supply The MAX15040 features 1MHz fixed-frequency PWM Adjustable Output from 0.6V to (0.9 x V ) IN mode operation. The high operating frequency allows Adjustable Soft-Start Reduces Inrush Supply for small-size external components. Current The low-resistance on-chip nMOS switches ensure high Factory-Trimmed 1MHz Switching Frequency efficiency at heavy loads while minimizing critical parasitic inductances, making the layout a much simpler task with Compatible with Ceramic, Polymer, and respect to discrete solutions. Following a simple layout Electrolytic Output Capacitors and footprint ensures first-pass success in new designs. Safe Startup into Prebias Output The MAX15040 incorporates a high-bandwidth Enable Input/Power-Good Output (> 15MHz) voltage-error amplifier. The voltage-mode Fully Protected Against Overcurrent and control architecture and the voltage-error amplifier per- Overtemperature mit a Type III compensation scheme to achieve maxi- mum loop bandwidth, up to 200kHz. High loop Overload Hiccup Protection bandwidth provides fast transient response, resulting in Sink/Source Current in DDR Applications less required output capacitance and allowing for all- 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch ceramic capacitor designs. WLP Package The MAX15040 features an output overload hiccup pro- tection and peak current limit on both high-side (sourc- Ordering Information ing current) and low-side (sinking and sourcing current) MOSFETs, for ultra-safe operations in case of high out- PART TEMP RANGE PIN-PACKAGE put prebias, short-circuit conditions, severe overloads, M AX15040E WE+ - 40 C to +8 5C 16 WLP or in converters with bulk electrolytic capacitors. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX15040 features an adjustable output voltage. The output voltage is adjustable by using two external Typical Operating Circuit resistors at the feedback or by applying an external ref- erence voltage to the REFIN/SS input. The MAX15040 INPUT offers programmable soft-start time using one capacitor 2.4V TO 3.6V IN BST to reduce input inrush current. A built-in thermal shut- down protection assures safe operation under all condi- MAX15040 EN OUTPUT tions. The MAX15040 is available in a 2mm x 2mm, LX 16-bump (4 x 4 array), 0.5mm pitch WLP package. V DD Applications GND Server Power Supplies Point-of-Load FB ASIC/CPU/DSP Core and I/O Voltages REFIN/SS DDR Power Supplies V DD COMP Base-Station Power Supplies Telecom and Networking Power Supplies RAID Control Power Supplies PWRGD GND Pin Configuration appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEHigh-Efficiency, 4A, Step-Down Regulator with Integrated Switches in 2mm x 2mm Package ABSOLUTE MAXIMUM RATINGS IN, V , PWRGD to GND ......................................-0.3V to +4.5V Continuous Power Dissipation (T = +70C) DD A LX to GND....................-0.3V to the lower of 4.5V or (V + 0.3V) 16-Bump (4 x 4 Array), 0.5mm Pitch WLP IN LX Transient ..............(V - 1.5V, <50ns), (V + 1.5V, <50ns) (derated 12.5mW/C above +70C)...........................1000mW GND IN COMP, FB, REFIN/SS, Operating Temperature Range ...........................-40C to +85C EN to GND..............-0.3V to the lower of 4.5V or (V + 0.3V) Junction Temperature......................................................+150C DD LX RMS Current (Note 1) .........................................................5A Continuous Operating Temperature at BST to LX..................................................................-0.3V to +4V Full Load Current (Note 2) ...........................................+105C BST to GND..............................................................-0.3V to +8V Storage Temperature Range .............................-65C to +150C Soldering Temperature (reflow) .......................................+260C Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed the package power dissipation limit of the device. Note 2: Continuous operation at full current beyond +105C may degrade product life. 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 = 3.3V, T = -40C to +85C. Typical values are at T = +25C, circuit of Figure 1, unless otherwise noted.) (Note 3) IN DD A A PARAMETER CONDITIONS MIN TYP MAX UNITS IN/V DD IN and V Voltage Range 2.40 3.60 V DD V = 2.5V 0.52 1 IN IN Supply Current No load, no switching mA V = 3.3V 0.8 1.5 IN V = 2.5V 3.7 5.5 IN V Supply Current No load, no switching mA DD V = 3.3V 4 6 IN V = V = 2.5V 12 IN DD Total Supply Current (IN + V ) No load mA DD V = V = 3.3V 23 IN DD Total Shutdown Current from IN V = V = V - V = 3.6V, V = 0V 0.1 2 A IN DD BST LX EN and V DD V rising 2 2.2 DD V Undervoltage Lockout DD LX starts/stops switching V Threshold V falling 1.75 1.9 DD V UVLO Deglitching 2s DD BST T = +25C 2 V = V = V = 3.6V, A BST DD IN BST Leakage Current A V = 3.6V or 0V, V = 0V LX EN T = +85C 0.025 A PWM COMPARATOR PWM Comparator Propagation 10mV overdrive 10 ns Delay COMP COMP Clamp Voltage High V = 2.4V to 3.6V 2.03 V DD COMP Clamp Voltage Low V = 2.4V to 3.6V 0.73 V DD COMP Slew Rate 1.6 V/s PWM Ramp Valley V = 2.4V to 3.6V 830 mV DD PWM Ramp Amplitude 1V COMP Shutdown Resistance From COMP to GND, V = 0V 8 EN 2 MAX15040