LT1764A

` Optimized for Fast Transient Response
` Output Current: 3A
` Dropout Voltage: 340mV at 3A
` Low Noise: 40V_RMS (10Hz to 100kHz)
` 1A Quiescent Current
` Wide Input Voltage Range: 2.7V to 20V
` 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 Supply
· Post Regulator for Switching Supplies

IN Pin Voltage .......................................................... ±20V
OUT Pin Voltage ....................................................... ±20V
Input to Output Differential Voltage (Note 12) ......... ±20V
SENSE Pin Voltage .................................................... ±20V
ADJ Pin Voltage ........................................................... ±7V
SHDN Pin Voltage ..................................................... ±20V
Output Short-Circuit Duration ............................. Indefinite
Operating Junction Temperature Range 40°C to 125°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C

The LT^®1764A is a low dropout regulator optimized for fast transient response. The device is capable of supplying 3A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to <1A 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 LT1764A has very low output voltage noise which makes the device ideal for sensitive RF supply applications.

Output voltage range is from 1.21V to 20V. The LT1764A 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 currentprotection. The device is 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 LT1764A regulators are available in 5-lead TO-220 and DD packages.