Diodes Incorporated introduced AP3591, a single-phase synchronous step-down controller, to improve the transient response and output accuracy of low-voltage regulators for notebook computers and integrated personal computers.
AP3591 operates at a fixed frequency between 100kHz and 700kHz for resistance programming. Its adaptive constant on-time control algorithm can cope with a very wide input-to-output voltage ratio and helps reduce the number of external components. The input and output voltage ranges of this device are 4.5V to 26V and 0.75V to 5.5V, respectively; the output current is up to 25A.
The controller provides two working mode options, including a diode emulation mode that can automatically reduce frequency and improve efficiency under light load conditions, and a constant frequency continuous conduction mode that effectively prevents light load output ripple.
The new controller uses a fourteen-pin QFN3535 package and provides circuit protection functions such as resistance programmable current limit, over-temperature shutdown, and over-voltage and under-voltage protection. The device also integrates soft start and soft stop functions.
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