LX8221

The LX8221 family of dual output linear regulators provide for the selection of either fixed or adjustable output voltages, and combine low dropout operation, fast transient performance, tight output voltage accuracy, and ultra-low ground current within a very small package footprint.

The PMOS output transistor allows for an ultra-low dropout characteristic (e.g., typically less than 175mV at 100mA). The individual regulators can be powered from either separate supply voltages or the same supply voltage between 2.8V to 6V allowing for maximum system flexibility.

An optional ceramic or tantalum type capacitor may be connected to each Bypass pin separately to improve performance in critical low-noise applications.

Overall regulator efficiency has been improved with a minimized operating ground current (typ < 140A per regulator). Further, this ground current is virtually eliminated in shutdown mode (typ < 1A).

Other safety features include channel independent Thermal and Short Circuit Current protection.

Separate Enable pins allow each regulator to be switched on and off independently by applying a TTL logic level control signal to the Enable pin further enhancing system level power management.

These features combined with a small footprint (i.e., 10-pin MSOP package) make the LX8221 especially useful for battery-operated equipment such as cellular telephones, laptop computers and PDA equipment.