LDO goes green

The XC6207 is a low noise, high speed, low dropout (LDO) voltage regulator with a a green operation (GO) function that makes it super energy efficient.

The new XC6207 from Torex Semiconductor Europe is a low noise, high speed, low dropout (LDO) voltage regulator with a difference - it has a green operation (GO) function that makes it super energy efficient.

This provides an extremely attractive solution for a wide range of handheld and portable equipment applications from mobile phones and wireless communications equipment, through PDAs, portable games and cameras, to AV equipment.

Depending on the load current level, the XC6207 automatically switches between high speed mode and power save mode, efficiently reducing power consumption at appropriate times.

In high speed mode power consumption is typically 50uA and in power save mode this falls to 6.0uA.

The switch point is fixed internally within the IC.

When only high speed operation is required high speed mode can be fixed by inputting a high level signal to the XC6207's GO pin, thus creating operating conditions with the most suitable level of supply current for the application.

Standby current is less than 0.1uA (typical).

The new green LDO incorporates a voltage reference, error amplifier, current limiter and a phase compensation circuit plus a driver transistor in a single IC.

It gives designers a low dropout voltage of 45mV at 30mA and fast ripple rejection of 70dB at 1kHz.

The XC6207 is available in a wide range of output voltage ratings, from 0.8 to 5.0V and selectable in 50mV increments.

Operating voltage range is 2.0 to 6.0V, maximum output current is 300mA.

The series is compatible with low ESR ceramic capacitors that give added output stability.

This stability is maintained even during load fluctuations due to the devices' excellent transient response.

Also available is a B type device that offers high speed auto discharge of the device's output capacitor.

By inputting a low signal to the CE pin, the IC is put into an off state.

In this state, in the case of the XC6207B, a short is created via the internal switch located between the Vout and Vss pins.

This short enables the stored charge at the output capacitor to be discharged allowing Vout to quickly return to the Vss level.

The XC6207 is available in SOT-25, SOT-89-5 and ultracompact USP-6B packages.

Operational temperature range is -40 to +85øC.

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