High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator

The MAX15053 high-efficiency, current-mode, synchronous step-down switching regulator with integrated power switches delivers up to 2A of output current. The device operates from 2.7V to 5.5V and provides an output voltage from 0.6V up to 94% of the input voltage, making the device ideal for distributed power systems, portable devices, and preregulation applications.

The MAX15053 utilizes a current-mode control architecture with a high gain transconductance error amplifier. The current-mode control architecture facilitates easy compensation design and ensures cycle-by-cycle current limit with fast response to line and load transients.

The MAX15053 offers selectable skip-mode functionality to reduce current consumption and achieve a higher efficiency at light output load. The low RDS(ON) integrated switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout design a much simpler task with respect to discrete solutions. Utilizing a simple layout and footprint assures first-pass success in new designs.

The MAX15053 features a 1MHz, factory-trimmed, fixed-frequency PWM mode operation. The high switching frequency, along with the PWM current-mode architecture, allows for a compact, all-ceramic capacitor design.

The MAX15053 offers a capacitor-programmable soft-start reducing inrush current, startup into PREBIAS operations, and a PGOOD open-drain output that can be used as an interrupt and for power sequencing.

The MAX15053 is available in a 9-bump (3 x 3 array), 1.5mm x 1.5mm WLP package and is specified over the -40°C to +85°C temperature range.

Applications

* Distributed Power Systems * IP Phones * Notebook Power * Portable Devices * Preregulators for Linear Regulators * Server Power

* Simpler, Smaller Design than Discrete Solutions

* Integrated 30mΩ(typ) RDS(ON) High-Side and 18mΩ (typ) Low-Side MOSFETs at 5V

* Factory-Trimmed, 1MHz Switching Frequency

* Stable with Low-ESR Ceramic Output Capacitors

* Supported by Free EE-Sim® Design and Simulation Tool

* High Performance Suits Wide Range of Point-of- Load Applications

* ±1% Output-Voltage Accuracy Over Load, Line, and Temperature

* Continuous 2A Output Current Over Temperature

* Operates from 2.7V to 5.5V Supply

* Adjustable Output from 0.6V to Up to 0.94 x VIN

* High Efficiency Across Light and Heavy Loads Reduces Power Consumption and Heat

* 96% Efficiency with 3.3V Output at 2A

* Internal 30mΩ (typ) RDS(ON) High-Side and 18mΩ (typ) Low-Side MOSFETs at 5V

* Skip-Mode Functionality for Light Loads

* Control Power Startup and Sequencing for Glitch- Free Processor Operation

* Enable Input/Power-Good Output Enables Sequencing

* Safe-Startup Into Prebiased Output

* Programmable Soft-Start

* External Reference Input Can be Used to Drive Soft-Start Directly

* Integrated Protection Features for Improved Power- Supply Reliability

* Fully Protected Against Overcurrent and Overtemperature

* Input Undervoltage Lockout

* Cycle-by-Cycle Overcurrent Protection