MAX8566 19-3690 Rev 3 3/11 High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator General Description Features Internal 8m On-Resistance MOSFETs The MAX8566 high-efficiency switching regulator deliv- ers up to 10A load current at output voltages from 0.6V 10A Output PWM Step-Down Regulator to (0.87 x V ). The IC operates from 2.3V to 3.6V input IN 1% Output Accuracy over Load, Line, and supplies, making it ideal for point-of-load applications. Temperature The total output-voltage set error is less than 1% over Operates from 2.3V to 3.6V Input Supply load, line, and temperature. Adjustable Output from 0.6V to (0.87 x V ) IN The MAX8566 operates in pulse-width-modulation 250kHz to 2.4MHz Adjustable Frequency or SYNC (PWM) mode with a 250kHz to 2.4MHz switching fre- Input quency range that is programmable by an external Allows All-Ceramic-Capacitor Design resistor. The IC can be synchronized to an external SYNCOUT Drives 2nd Regulator 180 Out-of-Phase clock in the same frequency range using the SYNC input. The high operating frequency minimizes the size Prebiased or Monotonic Soft-Start of external components. Using low-R n-channel DS(ON) Programmable Soft-Start Time MOSFETs for both high- and low-side switches main- Output Tracking or Sequencing tains high efficiency at both heavy-load and high- Sourcing and Sinking Output Current switching frequencies. Power-Good Output The MAX8566 employs a voltage-mode control archi- 32-Lead TQFN Package tecture with a high-bandwidth (> 10MHz) error amplifi- er. The voltage-mode control architecture makes REFIN for DDR-Termination Application switching frequencies greater than 1MHz possible, achieving all-ceramic-capacitor designs to minimize PC Ordering Information board space. The error amplifier works with Type 3 PART TEMP RANGE PIN-PACKAGE compensation to fully utilize the bandwidth of the high- frequency switching to obtain fast transient response. MAX8566ETJ+ -40C to +85C 32 TQFN-EP* Adjustable soft-start time provides flexibility to minimize +Denotes lead(Pb)-free/RoHS-compliant package. input startup inrush current. An open-drain, power- *EP = Exposed pad. good (PWRGD) signal goes high when the output reaches 90% of its regulation point. Typical Operating Circuit The MAX8566 provides a SYNCOUT output to synchro- nize a second MAX8566 or a second regulator switch- INPUT 2.25V TO 3.6V ing 180 out-of-phase with the first to reduce the input ripple current, which consequently reduces the input- capacitance requirements. The MAX8566 also pro- REFIN FOR REFIN PGND TRACKING vides an external reference input (REFIN) for SS PGND output-tracking applications. SYSTEM EN PGND ENABLE The MAX8566 is available in a 32-pin, 5mm x 5mm TQFN SYNC PGND SYNC INPUT MAX8566ETJ+ PROGRAMMABLE package. The MAX8566 and all the required external FREQ STEP-DOWN REGULATOR LX FREQUENCY TQFN 5mm x 5mm 2 L1 components fit into a footprint of less than 0.80in . SYNC OUTPUT 180 SYNCOUT LX OUTPUT 330nH/10A UP TO 10A GND LX Applications C5 FB LX 2 x 22F 6.3V ASIC/CPU/DSP Core Voltages MONOTONIC SS POL Power Supplies SELECTION POWER-GOOD OUTPUT DDR Power Supplies Base-Station Power Supplies Fiber Power Supplies Telecom Power Supplies COMPENSATION Network Power Supplies 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 AVAILABLE V DD MODE COMP LSS PWRGD IN BST IN LX IN LX IN LX IN LX PGNDHigh-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator ABSOLUTE MAXIMUM RATINGS EN/SS, EN, IN, SYNC, V , Continuous Power Dissipation (T = +85C) DD A LSS, PWRGD to GND ..........-0.3V to +4V (4.5V nonswitching) TQFN (derate 33.3mW/C above +70C) ..................2666.7W SYNCOUT, SS, COMP, FB, REFIN, Operating Temperature Range ...........................-40C to +85C FREQ to GND .........................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD LX Current (Note 1).................................................-12A to +12A Storage Temperature Range .............................-65C to +150C BST to LX.................................-0.3V to +4V (4.5V nonswitching) Lead Temperature (soldering, 10s) .................................+300C PGND to GND .......................................................-0.3V to +0.3V Soldering Temperature (reflow) .......................................+260C Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed the ICs package power-dissipation limits. 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 = V = 3.3V, V = 0.5V, V = 0V, T = 0C to +85C, typical values are at T = +25C, unless otherwise noted.) IN DD EN FB SYNC A A PARAMETER CONDITIONS MIN TYP MAX UNITS IN/V DD IN and V Voltage Range 2.3 3.6 V DD LSS Voltage Range 2.3 3.6 V Quiescent current, V = 0.7V 0.7 2.2 FB IN Supply Current mA f = 1MHz, no load 14 S Quiescent current, V = 0.7V 1.8 4 FB V Supply Current mA DD f = 1MHz, V = V S LSS DD 16 T = +25C 50 A Total Shutdown Current into IN V = V = V = (V - V ) = IN DD LSS BST LX A and V 3.6V, V = 0V DD EN T = 0C to +85C 3 A V rising 2.0 2.2 V Undervoltage-Lockout LX starts/stops switching, 2s DD DD V Threshold deglitch V falling 1.72 1.90 DD BST T = +25C 10 V = V = V = 3.6V, V = A IN DD BST LX Shutdown Supply Current A 3.6V or 0V, V = 0V EN T = 0C to +85C 0.05 A PWM COMPARATOR Comparator Propagation Delay 10mV overdrive 20 ns COMP Clamp Voltage, High V = 2.3V to 3.6V, V = 0.7V 1.80 2.0 2.15 V IN FB Slew Rate 0.75 1.4 V/s Shutdown Resistance From COMP to GND, V = 0V 30 100 EN ERROR AMPLIFIER FB Regulation Voltage V = 1V to 2V, V = 2.5V and 3.3V 0.594 0.6 0.606 V COMP DD V - DD V = 2.3V to 2.6V 0 DD 1.65 Error-Amplifier Common-Mode V Input Range V - DD V = 2.6V to 3.6V 0 DD 1.7 Error-Amplifier Maximum Output 0.8 mA Current 2 MAX8566