Maxim produces Quick-PWM step-down controller
Maxim Integrated Products
MAX17031 step-down controller
Maxim Integrated Products has introduced the MAX17031, a dual Quick-PWM step-down controller with synchronous rectification 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 is designed to provide a space-saving solution for notebook computers, tablet PCs and other portable devices.
The device employs low-side MOSFET sensing for an efficient current sense for valley current-limit protection.
Combined with output over-voltage and under-voltage 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 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 PWM schemes.
The MAX17031 is available in a 4mm x 4mm, 24-pin TQFN package and is fully specified over the -40C to +85C industrial temperature range.
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