30mA Low Noise LDO Regulator From Torex

2nd March 2009

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Datasheet

Available in the ultra-small USP-4 package (1.2mm x 1.6mm x 0.6mm), as well as in standard SOT-25 and SSOT-24 (SC-82) versions, the XC6225 Series of voltage regulators from Torex Semiconductor offer exceptionally low dropout voltage – typically 70mV with 30mA load. These high current, ultra-low dropout voltage regulators provide a highly stable, low noise supply that meets the demands of battery-driven circuits such as those found in mobile and cordless phones, digital and video cameras, PDAs and portable games, as well as portable AV equipment.

The XC6225 Series consists of a voltage reference, an error amplifier, a current limiter, 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 2.5V to 6.0V. The current limit fold-back circuit works as a short circuit protection as well as the output current limiter. The XC6225 Series achieves a fast response with only 25μA of low power consumption. The current limit is set to 50mA (typ) so that the device is optimised to protect the circuit from over-current. It is ideally suited for applications requiring 30mA or less.

The CE (chip enable) function allows design engineers to turn off the output, putting the device into standby mode, thereby greatly reducing power consumption. In this standby state, the XC6225B Series can discharge the electric charge stored at the output capacitor through the internal auto-discharge switch, and as a result the VOUT pin quickly returns to the VSS level. The output stabilisation capacitor (CL) is also compatible with low ESR ceramic capacitors.