LT1963A

Optimized for Fast Transient Response
Output Current: 1.5A
Dropout Voltage: 340mV
Low Noise: 40VRMS (10Hz to 100kHz)
1A Quiescent Current
No Protection Diodes Needed
Controlled Quiescent Current in Dropout
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
Adjustable Output from 1.21V to 20V
<1mA Quiescent Current in Shutdown
Stable with 10F Output Capacitor
Stable with Ceramic Capacitors
Reverse Battery Protection
No Reverse Current
Thermal Limiting

3.3V to 2.5V Logic Power Supplies
Post Regulator for Switching Supplies

IN Pin Voltage ........................................................ ±20V
OUT Pin Voltage .................................................... .±20V
Input to Output Differential Voltage (Note 2) ......... ±20V
SENSE Pin Voltage ............................................... ...±20V
ADJ Pin Voltage ......................................................... ±7V
SHDN Pin Voltage ................................................. ...±20V
Output Short-Circuit Duration ............................ Indefinite
Operating Junction Temperature Range 45 to 125
Storage Temperature Range ....................65 to 150
Lead Temperature (Soldering, 10 sec).................. ...300

The LT^®1963A series are low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to < 1mA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the LT1963A regulators have very low output noise which makes them ideal for sensitive RF supply applications.

Output voltage range is from 1.21V to 20V. The LT1963A regulators are stable with output capacitors as low as 10F. Small ceramic capacitors can be used without the necessary addition of ESR as is common with other regulators. Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The devices are available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1963A regulators are available in 5-lead TO-220, DD, 3-lead SOT-223 and 8-lead SO packages.