EVALUATION KIT AVAILABLE MAX15053 High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator General Description Benefits and Features The MAX15053 high-efficiency, current-mode, synchro- Simpler, Smaller Design than Discrete Solutions nous step-down switching regulator with integrated power Integrated 30m (typ) R High-Side DS(ON) switches delivers up to 2A of output current. The device and 18m (typ) Low-Side MOSFETs at 5V operates from 2.7V to 5.5V and provides an output volt- Factory-Trimmed, 1MHz Switching Frequency age from 0.6V up to 94% of the input voltage, making Stable with Low-ESR Ceramic Output Capacitors the device ideal for distributed power systems, portable Supported by Free EE-Sim Design and devices, and preregulation applications. Simulation Tool The MAX15053 utilizes a current-mode control archi- High Performance Suits Wide Range of Point-of- tecture with a high gain transconductance error ampli- Load Applications fier. The current-mode control architecture facilitates 1% Output-Voltage Accuracy Over Load, Line, easy compensation design and ensures cycle-by-cycle and Temperature current limit with fast response to line and load transients. Continuous 2A Output Current Over Temperature Operates from 2.7V to 5.5V Supply The MAX15053 offers selectable skip-mode functional- Adjustable Output from 0.6V to Up to 0.94 x V IN ity to reduce current consumption and achieve a higher efficiency at light output load. The low R integrated High Efficiency Across Light and Heavy Loads DS(ON) switches ensure high efficiency at heavy loads while Reduces Power Consumption and Heat minimizing critical inductances, making the layout design 96% Efficiency with 3.3V Output at 2A a much simpler task with respect to discrete solutions. Internal 30m (typ) R High-Side and 18mI DS(ON) Utilizing a simple layout and footprint assures first-pass (typ) Low-Side MOSFETs at 5V success in new designs. Skip-Mode Functionality for Light Loads The MAX15053 features a 1MHz, factory-trimmed, fixed- Control Power Startup and Sequencing for Glitch- frequency PWM mode operation. The high switching fre- Free Processor Operation quency, along with the PWM current-mode architecture, Enable Input/Power-Good Output Enables allows for a compact, all-ceramic capacitor design. Sequencing Safe-Startup Into Prebiased Output The MAX15053 offers a capacitor-programmable soft- Programmable Soft-Start start reducing inrush current, startup into PREBIAS External Reference Input Can be Used to Drive operations, and a PGOOD open-drain output that can be Soft-Start Directly used as an interrupt and for power sequencing. Integrated Protection Features for Improved Power- The MAX15053 is available in a 9-bump (3 x 3 array), Supply Reliability 1.5mm x 1.5mm WLP package and is specified over the Fully Protected Against Overcurrent and -40NC to +85NC temperature range. Overtemperature Input Undervoltage Lockout Applications Cycle-by-Cycle Overcurrent Protection Distributed Power Systems Preregulators for Linear Regulators Portable Devices Ordering Information Notebook Power PART TEMP RANGE PIN-PACKAGE Server Power MAX15053EWL+ -40C to +85C 9 WLP IP Phones +Denotes a lead(Pb)-free/RoHS-compliant package. Typical Operating Circuit appears at end of data sheet. EE-Sim is a registered trademark of Maxim Integrated Products, Inc. 19-5240 Rev 3 4/15MAX15053 High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator Absolute Maximum Ratings IN, PGOOD to GND ................................................-0.3V to +6V Continuous Power Dissipation (T = +70NC) A LX to GND ..................................................-0.3V to (V + 0.3V) 9-Bump WLP Multilayer Board IN LX to GND .......................................-1V to (V + 0.3V) for 50ns (derate 14.1mW/NC above T = +70NC) ....................1127mW IN A EN, COMP, FB, SS/REFIN, SKIP to GND ...-0.3V to (V + 0.3V) Operating Temperature Range .......................... -40NC to +85NC IN LX Current (Note 1) ................................................... -5A to +5A Operating Junction Temperature (Note 2) ......................+105NC Output Short-Circuit Duration ....................................Continuous Storage Temperature Range ............................ -65NC to +150NC Soldering Temperature (reflow) ......................................+260NC Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should not exceed the ICs package power dissipation limits. Note 2: Limit the junction temperature to +105NC for continuous operation at maximum output current. Package Thermal Characteristics (Note 3) WLP Junction-to-Case Thermal Resistance (B ) ...................26NC/W JC Junction-to-Ambient Thermal Resistance (B ) ..............71NC/W JA Note 3: 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.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = 5V, T = -40NC to +85NC, unless otherwise noted, typical values are at T = +25NC.) (Note 4) IN A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IN Voltage Range V 2.7 5.5 V IN IN Shutdown Supply Current V = 0V 0.2 2 FA EN IN Supply Current I V = 5V, V = 0.65V, no switching 1.56 2.3 mA IN EN FB V Undervoltage Lockout IN LX starts switching, V rising 2.6 2.7 V IN Threshold V Undervoltage Lockout IN LX stops switching, V falling 200 mV IN Hysteresis ERROR AMPLIFIER Transconductance g 1.5 mS MV Voltage Gain A 90 dB VEA FB Set-Point Accuracy V Over line, load, and temperature 594 600 606 mV FB FB Input Bias Current I V = 0.6V -500 +500 nA FB FB COMP to Current-Sense g 18 A/V MC Transconductance COMP Clamp Low V = 0.65V, V = 0.6V 0.94 V FB SS POWER SWITCHES LX On-Resistance, High-Side 30 mI pMOS LX On-Resistance, Low-Side 18 mI nMOS High-Side Switch Current-Limit I 4 A HSCL Threshold Low-Side Switch Sink Current- 4 A Limit Threshold Maxim Integrated 2 www.maximintegrated.com