High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches

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 inductances. 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, and enable input and 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 -40°C to +85°C extended temperature range.

Applications

* Base Stations * DDR Memory * Distributed Power Systems * Notebooks * Servers

* Continuous 18A Output Current

* ±1% Feedback Accuracy Over Load, Line, and Temperature

* Operates from 2.7V to 5.5V Supply

* Input Undervoltage Lockout

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

* Programmable Soft-Start

* Factory-Trimmed 1MHz Switching Frequency

* Stable with Low-ESR Ceramic Output Capacitors

* Safe-Startup into a Prebiased Output

* External Reference Input

* Selectable Skip Mode Option for Improved Efficiency at Light Loads

* Enable Input/PGOOD Output Allows Sequencing

* Remote Ground Sense for Improved Accuracy

* Thermal and Overcurrent Protection

* Tiny 2.10mm x 3.56mm, 28-Bump WLP Package