LT1764

Features:

Optimized for Fast Transient Response
Output Current: 3A
Dropout Voltage: 340mV at 3A
Low Noise: 40m VRMS (10Hz to 100kHz)
1mA 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<1m A Quiescent Current in Shutdown
Stable with 10m F Output Capacitor
Reverse Battery Protection
No Reverse Current
Thermal Limiting


Application

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


Specifications

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


Description

The LT^(R) 1764 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. Oper- ating quiescent current is 1mA, dropping to <1m A 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 LT1764 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 LT1764 regulators are stable with output capacitors as low as 10m F. Internal protection circuitry includes reverse battery pro-tection, current limiting, thermal limiting and reverse cur-rent protection. 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 LT1764 regu-lators are available in 5-lead TO-220 and DD packages.