LT1121CN8-3.3

Series: -
Regulator Topology: Positive Fixed
Number of Regulators: 1
Current - Limit (Min): -
Operating Temperature: 0°C ~ 125°C
Mounting Type: Through Hole
Voltage - Output: 3.3V
Current - Output: 150mA
Packaging: Tube
Package / Case: 8-DIP (0.300", 7.62mm)
Supplier Device Package: 8-PDIP
Manufacturer: Linear Technology
Voltage - Dropout (Typical): 0.42V @ 150mA
Voltage - Input: 4.17 V ~ 30 V


Features:

· 0.4V Dropout Voltage
· 150mA Output Current
· 30mA Quiescent Current
· No Protection Diodes Needed
· Adjustable Output from 3.8V to 20V
· 3.3V and 5V Fixed Output Voltages
· Controlled Quiescent Current in Dropout
· Shutdown
· 16mA Quiescent Current in Shutdown
· Stable with 0.33mF Output Capacitor
· Reverse Battery Protection
· No Reverse Current with Input Low
· Thermal Limiting


Application

· Low Current Regulator
· Regulator for Battery-Powered Systems
· Post Regulator for Switching Supplies


Pinout




Specifications

Input Voltage .....................................................±30V*
Output Pin Reverse Current ................................. 10mA
Adjust Pin Current ............................................... 10mA
Shutdown Pin Input Voltage (Note 1) ........ 6.5V, 0.6V
Shutdown Pin Input Current (Note 1) .................. 20mA
Output Short-Circuit Duration ......................... Indefinite
Storage Temperature Range ............... 65 to 150
Operating Junction Temperature Range (Note 2)
    LT1121C-X ......................................... 0 to 125
    LT1121I-X ..................................... 40 to 125
Lead Temperature (Soldering, 10 sec).................300
*For applications requiring input voltage ratings greater than 30V, contact the factory.


Description

The LT1121/LT1121-3.3/LT1121-5 are micropower low dropout regulators with shutdown. These devices are capable of supplying 150mA of output current with a dropout voltage of 0.4V. Designed for use in batterypowered systems, the low quiescent current, 30mA operating and 16mA in shutdown, makes them an ideal choice. The quiescent current is well-controlled; it does not rise in dropout as it does with many other low dropout PNP regulators.

Other features of the LT1121/LT1121-3.3/LT1121-5 include the ability to operate with very small output capacitors. They are stable with only 0.33mF on the output while most older devices require between 1mF and 100mF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also the input may be connected to ground or a reverse voltage without reverse current flow from output to input. This makes the LT1121 series ideal for backup power situations where the output is held high and the input is at ground or reversed. Under these conditions only 16mA will flow from the output pin to ground.

Parameters:

Technical/Catalog Information	LT1121CN8-3.3
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Regulator Type	Single Output
Package / Case	8-DIP (300 mil)
Packaging	Tube
Regulator Topology	Positive Fixed
Current - Output	150mA
Voltage - Output	3.3V
Operating Temperature	0°C ~ 125°C
Voltage - Input	4.3 ~ 20 V
Number of Regulators	1
Current - Limit (Min)	200mA
Current Short Circuit (Isc)	-
Drawing Number	161; 05-08-1510; N; 8
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LT1121CN8 3 3 LT1121CN833