Linear Technology has introduced a ride-through DC-DC voltage converter IC which can deal with a sudden loss of input voltage from a single supercapacitor energy source.
The IC has a main buck regulator with a built-in boost converter for temporary backup, or ride-through, of VOUT during a sudden loss of input voltage.
The device monitors VIN, VOUT and VCAP and automatic switchover to backup power in charging of a supercapacitor (or other storage element).
The LTC3355’s non-synchronous constant frequency current mode monolithic 1A buck switching regulator provides a 2.7V to 5V regulated output voltage from an input supply up to 20V.
The device can also be used for ride-through, “dying gasp” or data backup supplies commonly used in power meters, industrial alarms and solid state drives.
The IC uses a 1A programmable constant-current/constant-voltage (CC/CV) linear charger powered from VOUT to charge a single supercapacitor, electrolytic capacitor or NiMH battery.
A thermal regulation loop maximizes charge current while limiting the die temperature to 110°C. When the VIN supply drops below the programmable power-fail comparator input (PFI) threshold, the device’s constant frequency nonsynchronous current mode 5A boost switching regulator delivers power from the supercapacitor to VOUT.
Backup power can be delivered to VOUT with capacitor voltages as low as 0.5V.
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