MAX15050/MAX15051 19-4915 Rev 2 3/10 High-Efficiency, 4A, 1MHz, Step-Down Regulators with Integrated Switches in 2mm x 2mm Package General Description Features The MAX15050/MAX15051 high-efficiency switching reg- Internal 18m R MOSFETs DS(ON) ulators deliver up to 4A load current at output voltages Pulse-Skip Mode for High-Efficiency Light Load from 0.6V to (0.9 x V ). The devices operate from 2.9V IN (MAX15050) to 5.5V, making them ideal for on-board point-of-load Continuous 4A Output Current and postregulation applications. Total output-voltage accuracy is within 1% over load, line, and temperature. 1% Output-Voltage Accuracy Over Load, Line, and Temperature The MAX15050/MAX15051 feature 1MHz fixed-frequen- cy PWM operation. The MAX15050 features pulse-skip Operates from 2.9V to 5.5V Supply mode to improve light-load efficiency. The MAX15050 Adjustable Output from 0.6V to (0.9 x V ) IN soft-starts in a monotonic mode and then operates in Adjustable Soft-Start Reduces Inrush Supply Current the forced PWM mode or pulse-skip mode depending on the output load current condition. The MAX15051 Factory-Trimmed 1MHz Switching Frequency soft-starts in the monotonic mode and operates in the Compatible with Ceramic, Polymer, and forced PWM mode. The high operating frequency Electrolytic Output Capacitors allows for small-size external components. Safe Startup Into Prebias Output The low-resistance on-chip nMOS switches ensure high Enable Input/Power-Good Output efficiency at heavy loads while minimizing critical parasitic inductances, making the layout a much simpler task with Fully Protected Against Overcurrent and respect to discrete solutions. Following a simple layout Overtemperature and footprint ensures first-pass success in new designs. Overload Hiccup Protection The MAX15050/MAX15051 incorporate a high-bandwidth Sink/Source Current for DDR Applications (> 26MHz) voltage-error amplifier. The voltage-mode control 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch architecture and the voltage-error amplifier permit a type III WLP Package compensation scheme to achieve maximum loop band- width, up to 200kHz. High loop bandwidth provides fast Ordering Information transient response, resulting in less required output capaci- tance and allowing for all-ceramic capacitor designs. PIN- SKIP PART TEMP RANGE PACKAGE MODE The MAX15050/MAX15051 feature an output overload M A X15 0 5 0 E WE+ - 40 C to +8 5C 16 WLP Yes hiccup protection and peak current limit on both high- side and low-side MOSFETs. These features provide for M A X15 0 5 1 E WE+ - 40 C to +8 5C 16 WLP No ultra-safe operation in the cases of short-circuit condi- +Denotes a lead(Pb)-free/RoHS-compliant package. tions, severe overloads, or in converters with bulk elec- trolytic capacitors. Typical Operating Circuit The MAX15050/MAX15051 feature an adjustable output volt- age. The output voltage is adjustable by using two external resistors at the feedback or by applying an external reference INPUT 2.9V TO 5.5V voltage to the REFIN/SS input. The MAX15050/MAX15051 IN BST offer programmable soft-start time using one capacitor to EN OUTPUT MAX15050 reduce input inrush current. A built-in thermal shutdown pro- LX MAX15051 tection assures safe operation under all conditions. The V DD MAX15050/MAX15051 are available in a 2mm x 2mm, GND 16-bump (4 x 4 array), 0.5mm pitch WLP package. Applications FB V DD Server Power Supplies Telecom and REFIN/SS COMP Networking Power Point-of-Load Supplies ASIC/CPU/DSP Core PWRGD RAID Control Power GND and I/O Voltages Supplies DDR Power Supplies Portable Applications Base-Station Power Pin Configuration appears at end of data sheet. Supplies 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, 1MHz, Step-Down Regulators with Integrated Switches in 2mm x 2mm Package ABSOLUTE MAXIMUM RATINGS IN, PWRGD to GND..................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A V to GND..................-0.3V to the lower of +4V or (V + 0.3V) 16-Bump (4 x 4 Array), 0.5mm Pitch WLP DD IN COMP, FB, REFIN/SS to GND....................-0.3V to (V + 0.3V) (derate 20.4mW/C above +70C)..............................1000mW DD EN to GND................................................................-0.3V to +6V Thermal Resistance (Note 2) BST to LX..................................................................-0.3V to +6V .................................................................................49C/W JA BST to GND............................................................-0.3V to +12V ...................................................................................9C/W JC LX to GND ....................-0.3V to the lower of +6V or (V + 0.3V) Operating Temperature Range ...........................-40C to +85C IN LX to GND (Note 1) ..-1V to the lower of +6V or (V + 1V) for 50ns Junction Temperature......................................................+150C IN I ....................................................................................6A Operating Junction Temperature LX(RMS) V Output Short-Circuit Duration .............................Continuous at Maximum Current (Note 3)........................................+105C DD Converter Output Short-Circuit Duration....................Continuous Storage Temperature Range .............................-65C to +150C Soldering Temperature (soldering, 10s)..........................+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 ICs power dissipation limit of the device. Note 2: 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.maxim-ic.com/thermal-tutorial. Note 3: Operating the junction temperature above +105C will degrade the life of the device. 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 = 5V, C = 2.2F, T = -40C to +85C, typical values are at T = +25C, unless otherwise noted.) (Note 4) IN EN VDD A A PARAMETER CONDITIONS MIN TYP MAX UNITS IN Voltage Range 2.9 5.5 V V = 3.3V 4.8 8 IN IN Supply Current No load, no switching mA V = 5V 5.3 8.5 IN Total Shutdown Current from IN V = V - V = 5V, V = 0V 10 20 A IN BST LX EN V rising 2.6 2.8 V Undervoltage Lockout LX starts/stops switching, DD DD V Threshold no load V falling 2.35 2.55 DD V Undervoltage Deglitching 10 s DD V Output Voltage I = 0 to 10mA 3.1 3.3 3.5 V DD VDD V Dropout V = 2.9V, I = 10mA 0.09 V DD IN VDD V Current Limit V = 0V 20 37 mA DD DD BST MAX15050, V = 5V, V = 0V, no switching 10 BST LX BST Supply Current A MAX15051, V = V = 3.3V, V = 6.6V, IN LX BST 250 no switching IN to BST On-Resistance V = 3.3V, I = 0.16A 4 IN IN PWM COMPARATOR PWM Comparator Propagation 10mV overdrive 20 ns Delay PWM Peak-to-Peak Ramp 1 V Amplitude PWM Valley Amplitude 0.76 V 2 MAX15050/MAX15051