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GENERAL DESCRIPTION

The ADM663A/ADM666A are precision linear voltage regulators featuring a maximum quiescent current of 9 μA. They can be used to give a fixed +3.3 V or +5 V output with no additional external components or can be adjusted from 1.3 V to 16 V using two external resistors. Fixed or adjustable operation is automatically selected via the VSET input. The low quiescent current makes these devices especially suitable for battery powered systems. The input voltage range is 2 V to 16.5 V, and an output current up to 100 mA is provided. Current limiting may be set using a single external resistor. For additional safety, an internal thermal shutdown circuit monitors the internal die temperature.

FEATURES

Tri-Mode Operation

3.3 V, 5 V Fixed or +1.3 V to +16 V Adjustable

Low Power CMOS: 9 μA max Quiescent Current

High Current 100 mA Output

Low Dropout Voltage

Upgrade for ADM663/ADM666

“Small” 0.1 μF Output Capacitor (0805 Style)

+2 V to +16.5 V Operating Range

Low Battery Detector ADM666A

No Overshoot on Power-Up

Thermal Shutdown

APPLICATIONS

Handheld Instruments

LCD Display Systems

Pagers

Battery Operated Equipment