Torex converter incorporates voltage detector

The XC9515 Series from Torex Semiconductor is a dual-channel synchronous step-down DC/DC converter that incorporates a voltage detector with built-in delay circuit.

This XC9515 is available in the QFN-20 package and is suitable for applications including DVD and Blu-ray equipment, LCD TVs and modules, multifunctional printers and set top boxes.

The DC/DC converter block operates from a supply voltage range between 2.5V and 5V, providing output voltages that can be factory set in 100mV increments between 1.2V and 4V per channel and output currents up to 800mA.

It incorporates a p-channel 0.35 ohm (typical) Mosfet driver and a synchronous n-channel 0.35 ohm (typical) switching transistor.

By minimising on-resistance of the built-in transistors, the XC9515 Series can deliver efficiency of up to 95 per cent (VIN=5V, VOUT=3.3V) and stable output current of up to 800mA per channel.

With a high switching frequency of 1MHz, small inductors can be used to enable engineers to reduce a design footprint.

All devices in the XC9515 Series offer a variety of safety features including short-circuit protection, thermal shutdown and integral latch (over-current limit).

An under-voltage lock out (UVLO) feature is also incorporated, which shuts down the supply if the input voltage falls below 1.8V, preventing anomalous operation and ensuring a normal start after power dips.

The voltage detector block can be used to set delay time freely by connecting an external capacitor.

Voltage detect range is between 2V and 5.5V (+/-2 per cent) and the device can output a reset signal at any time using the manual reset function.

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