PDF MAX15118 Data sheet ( Hoja de datos )

Número de pieza	MAX15118
Descripción	Current-Mode Synchronous Step-Down Regulator
Fabricantes	Maxim Integrated Products
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No Preview Available ! 19-5967; Rev 0; 6/11 EVALUATION KIT AVAILABLE MAX15118 High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches General Description The MAX15118 high-efficiency, current-mode step-down regulator with integrated power switches operates from 2.7V to 5.5V and delivers up to 18A of output current in a small 2mm x 3.5mm package. The MAX15118 offers excellent efficiency with skip mode capability at light- load conditions, yet provides unmatched efficiency under heavy load conditions. The combination of small size and high efficiency makes this device suitable for both portable and nonportable applications. The MAX15118 utilizes a current-mode control architecture with a high-gain transconductance error amplifier, which allows a simple compensation scheme and enables a cycle-by-cycle current limit with fast response to line and load transients. A factory-trimmed switching frequency of 1MHz (PWM operation) allows for a compact, all-ceramic capacitor design. Integrated switches with low on-resistance ensure high efficiency at heavy loads while minimizing critical induc- tances. The MAX15118’s simple layout and footprint assure first-pass success in new designs. Other features of the MAX15118 include a capacitor- programmable soft-start to reduce inrush current, safe startup into a prebiased output, an enable input, and a power-good output for power sequencing. The regulator is available in a 28-bump (4 x 7), 2.10mm x 3.56mm WLP package, and is fully specified over the -40NC to +85NC extended temperature range. Features S Continuous 18A Output Current Over Temperature S ±1% Feedback Accuracy Over Load, Line, and Temperature S Operates from 2.7V to 5.5V Supply S Input Undervoltage Lockout S Adjustable Output Range from 0.6V Up to 0.94 x VIN S Programmable Soft-Start S Factory-Trimmed 1MHz Switching Frequency S Stable with Low-ESR Ceramic Output Capacitors S Safe-Startup into a Prebiased Output S External Reference Input S Selectable Skip Mode Option for Improved Efficiency at Light Loads S Enable Input/PGOOD Output Allows Sequencing S Remote Ground Sense for Improved Accuracy S Thermal and Overcurrent Protection S Tiny 2.10mm x 3.56mm, 28-Bump WLP Package Applications Notebooks Servers Distributed Power Systems DDR Memory Base Stations Ordering Information appears at end of data sheet. Typical Operating Circuits ON OFF VIN = 2.7V TO 5.5V CIN PGOOD RPULL CSS EN BST SKIP LX AIN MAX15118 GSNS IN FB PGOOD SS/REFIN GND COMP CCC PWM MODE OPERATION Typical Operating Circuits continued at end of data sheet. CBST LOUT RC CC COUT VOUT R1 R2 For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX15118.related �� Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 page MAX15118 High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches Typical Operating Characteristics (continued) (VIN = 5V, VOUT = 1.5V, CSS = 0.1µF, see the Typical Operating Circuits, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. OUTPUT CURRENT (VIN = 3.3V, SKIP MODE) 100 95 VOUT = 2.5V SWITCHING FREQUENCY vs. INPUT VOLTAGE 1100 TA = +85°C 90 85 80 75 VOUT = 1.8V 70 VOUT = 1.5V 65 VOUT = 1.2V 60 VOUT = 0.8V 1050 TA = +25°C 1000 TA = -40°C 950 55 50 0 2 4 6 8 10 12 14 16 18 OUTPUT CURRENT (A) 900 2.7 3.1 3.5 3.9 4.3 4.7 5.1 INPUT VOLTAGE (V) 5.5 OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (PWM MODE, VOUT = 1.5V) 1.520 OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (SKIP MODE, VOUT = 1.5V) 1.53 1.515 1.510 1.505 1.52 1.51 NO LOAD 1.500 1.50 1.495 1.490 1.485 ILOAD = 10A ILOAD = 18A 1.49 ILOAD = 10A ILOAD = 2A 1.48 1.480 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V) 1.47 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V) OUTPUT VOLTAGE ERROR vs. SUPPLY VOLTAGE 0.50 0.40 NORMALIZED AT VIN = 3.5V 0.30 0.20 0.10 VOUT = 1.2V 0 -0.10 -0.20 -0.30 VOUT = 1.5V -0.40 VOUT = 1.8V -0.50 2.90 3.55 4.20 ILOAD = 18A 4.85 5.50 SUPPLY VOLTAGE (V) OUTPUT VOLTAGE vs. OUTPUT CURRENT (PWM MODE, VOUT = 1.5V) 1.53 1.52 VIN = 5V 1.51 1.50 1.49 VIN = 3.3V 1.48 1.47 0 2 4 6 8 10 12 14 16 18 OUTPUT CURRENT (A) �� Maxim Integrated Products 5 5 Page MAX15118 High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches Functional Diagram SKIP EN AIN SS/REFIN GSNS FB COMP PGOOD BIAS GENERATOR VOLTAGE REFERENCE 0.6V AV = 1 EN LOGIC, IN UVLO, THERMAL SHDN 0.58V 10µA SS/REFIN BUFFER PREBIAS ABOVE FORCED PWM START ERROR AMPLIFIER gM SKIP MODE LOGIC SKPM CURRENT-SENSE AMPLIFIER MAX15118 HIGH-SIDE CURRENT LIMIT IN LX LX PWM COMPARATOR CONTROL LOGIC C 555mV, RISING 530mV, FALLING OSCILLATOR RAMP GENERATOR COMPENSATION RAMP CK CK IN LOW-SIDE SOURCE-SINK CURRENT-LIMIT AND ZERO- CROSSING COMPARATOR SOURCE SINK ZX IN BST LX GND SKPM �� Maxim Integrated Products 11 11 Page

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