LDOs keep the quiescent current down

Edited by the Electronicstalk editorial team Mar 13, 2003

Torex has two new ranges of low-dropout voltage regulators based on its successful high-speed, low-noise XC6209 family.

Torex has two new ranges of low-dropout voltage regulators based on its successful high-speed, low-noise XC6209 family.

The XC6211 and XC6212 series are both provided in SOT-23-5 packages, with a variety of different pinout options.

This enables Torex to offer the same high performance as the XC6209 in a range of devices that have pin-compatibility with a number of other Japanese manufacturers' voltage regulators.

Torex's alternatives, however, offer the advantages of power and board space savings delivering significant benefits to designers of the latest generation of battery-powered handheld devices.

To reach the desired levels of low output noise most voltage regulators require an external bypass capacitor.

In the case of the XC6211 and XC6212 series this is unnecessary saving valuable board space.

The devices combine a voltage reference, error amplifier, current limiter, phase compensation circuit and a driver transistor in a single compact package.

The XC6211 and XC6212 series have an output voltage range of 0.9 to 5.0V and 0.9 to 6.0V, respectively, selectable in 50mV increments.

Both series have a maximum output current of 150mA, a very low dropout voltage of 200mV at 100mA, and high ripple rejection of 65dB (10kHz) for the XC6211 series and 70dB (10kHz) for the XC6212 series.

The XC6211 and XC6212 are fully stable with low ESR ceramic capacitors on the output bringing significant cost savings over competitive devices which require more expensive tantalum capacitors to maintain stability.

This stability is delivered even during load fluctuations due to the devices' extremely fast load and line transient response.

The regulators' current limiter foldback circuit also operates as a short circuit protect for the output limiter and the output pin.

Power consumption for the XC6211 and XC6212 series is very low at 25mA.

Their CE function enables the output to be turned off allowing a further reduction in power consumption.

Standby current is typically less than 0.1mA.

The regulators operate over a wide temperature range of -40 to +85C, and are available in compact SOT-25 packages or ultracompact chip scale USP-6B packages.