LT1761CS5-3

Features:

SOT-23 Package
Low Quiescent Current: 20A
Zero Quiescent Current Shutdown State
Low Dropout Voltage: 300mV
Output Current: 100mA
Low Noise: 20V_RMS (10Hz to 100kHz)
No Protection Diodes Needed
Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 1F Output Capacitor
Stable with Aluminum, Tantalum or Ceramic Capacitors
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected


Application

Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers


Pinout

Specifications

IN Pin Voltage .......................................................... ±20V
OUT Pin Voltage ....................................................... ±20V
Input to Output Differential Voltage ........................ ±20V
ADJ Pin Voltage ........................................................ ±7V
BYP Pin Voltage......................................................... ±0.6V
SHDN Pin Input Voltage ........................................... ±20V
Output Short-Circut Duration ................................... Indefinite
Operating Junction Temperature Range ................... 0°C to 125°C
Storage Temperature Range .................................... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)....................... 300°C


Description

The LT^®1761 series are micropower, low noise, low dropout regulators. The devices are capable of supplying 100mA of output current with a dropout voltage of 300mV. Designed for use in battery-powered systems, the low quiescent current, 20A operating and <1A in shutdown, make them an ideal choice. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators.

Other features of the LT1761 regulators include low output noise. With the addition of an external 0.01mF bypass capacitor, output noise drops to 20V_RMS over a 10Hz to 100kHz bandwidth. The LT1761 regulators are capable of operating with small capacitors and are stable with output capacitors as low as 1F. Small ceramic capacitors can be used without the series resistance required by other regulators. Internal protection circuitry  includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The parts come in fixed output voltages of 2.5V, 3V, 3.3V and 5V, and as an adjustable device with a 1.22V reference voltage. The LT1761 regulators are available in the 5-lead SOT-23 package.