Maxim introduces the MAX17031, a dual, Quick-PWM step-down controller with synchronous rectification specifically intended for generating 5V/3.3V supplies in battery-powered systems. This device integrates a 100mA linear regulator that generates the 5V bias needed for power-up or other lower power, "always-on" suspend supplies. The controller also includes a low-current (5mA), "always-enabled" linear regulator to power the real-time clock (RTC) when all other notebook regulators are disabled. The MAX17031 provides a complete, space-saving solution for notebook computers, tablet PCs, and other portable devices.

The device employs low-side MOSFET sensing to provide a low-cost, highly efficient current sense for valley current-limit protection. Combined with output overvoltage- and undervoltage-protection features, this current limit ensures robust output supplies. These 5V/3.3V SMPS outputs can save power by operating in pulse-skipping mode, or in ultrasonic mode to avoid audible noise.

Maxim's proprietary, Quick-PWM architecture enables the MAX17031 to handle fast load steps while maintaining a relatively constant operating frequency and inductor operating point over a wide range of input voltages. This approach circumvents the poor load-transient timing problems of fixed-frequency, current-mode PWMs, while also avoiding the problems caused by widely varying switching frequencies in conventional constant-on-time and constant-off-time PWM schemes.

The MAX17031 is available in a tiny, 4mm x 4mm, 24-pin TQFN package, and is fully specified over the -40 degrees Celsius to +85 degrees Celsius extended industrial temperature range. In order to speed up the test phase a related EvKit is also available.

Maxim was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 5900 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.