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Torex - Ultra Low Dropout Voltage Regulators With Reverse Current Protection

13th July 2009

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Datasheet

Available in the tiny USP-6C package (1.8 x 2.0 x 0.6mm), as well as in standard SOT-25 and SOT-89-5 versions, the new XC6222 Series of voltage regulators from Torex Semiconductor offer low dropout voltage – typically 120mV with a 300mA load (VOUT=3.0V). These high current, ultra-low dropout voltage regulators with reverse current protection provide a highly stable, low noise supply that meets the demands of battery-driven circuits as well as being optimised for use in back-up power circuits.

The XC6222 Series consists of a voltage reference, an error amplifier, a current limiter, a thermal protection circuit, a reverse current protection circuit and a phase compensation circuit plus a driver transistor.

Output voltage can be factory set anywhere from 0.8V to 5.0V in 50mV steps, and the operating voltage range is from 1.7V to 6.0V. The LDO is also compatible with low ESR ceramic capacitors, which give added output stability.

The reverse current protection circuit prevents damage to any connected products such as batteries which could occur as a result of current flowing from the VOUT pin to the VIN pin. Reverse current flow is limited to 1.5uA or less when the VIN voltage level is lower than the VOUT voltage level.

An over current protection circuit and a thermal shutdown circuit are also built in. The over current protection circuit will operate when the output current reaches its limit current level. When the junction temperature reaches its limit temperature (150°C), the thermal shutdown circuit takes control, it then releases at 125°C.

The CE (chip enable) function enables design engineers to turn off the output, putting the device into standby mode, thereby greatly reducing power consumption. In addition, for the XC6222B/D versions, the electric charge at the CL capacitor is discharged via the internal auto-discharge switch, ensuring that the VOUT pin drops down to ground quickly.