ADM663A

a FEATURES Tri-Mode Operation 3.3 V, 5 V Fixed or +1.3 V to +16 V Adjustable Low Power CMOS: 9 µ A max Quiescent Current High Current 100 mA Output Low Dropout Voltage Upgrade for ADM663/ADM666 “Small” 0.1 µ F 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 GENERAL DESCRIPTION Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators ADM663A/ADM666A* FUNCTIONAL BLOCK DIAGRAMS VIN 0.5V 1.3V A1 C1 SENSE VOUT2 VOUT1 SHDN D E C O D E R R1 C2 VIN–50mV VSET C3 50mV R2 0.9V A2 VTC R3 GND ADM663A 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. The ADM666A features additional low battery monitoring circuitry to detect for low battery voltages. The ADM663A/AD...