LT1129CQ-3.3

Series: -
Regulator Topology: Positive Fixed
Number of Regulators: 1
Current - Limit (Min): -
Operating Temperature: 0°C ~ 125°C
Mounting Type: Surface Mount
Voltage - Output: 3.3V
Packaging: Tube
Package / Case: TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Manufacturer: Linear Technology
Supplier Device Package: D2PAK-5
Voltage - Input: 4.15 V ~ 30 V
Voltage - Dropout (Typical): 0.45V @ 700mA
Current - Output: 700mA


Features:

· 0.4V Dropout Voltage
· 700mA Output Current
· 50mA Quiescent Current
· No Protection Diodes Needed
· Adjustable Output from 3.8V to 30V
· 3.3V and 5V Fixed Output Voltages
· Controlled Quiescent Current in Dropout
· Shutdown
· 16mA Quiescent Current in Shutdown
· Stable with 3.3mF Output Capacitor
· Reverse Battery Protection
· No Reverse Output Current
· Thermal Limiting
· Surface Mount


Application

· Low Current Regulator
·Regulator for Battery-Powered Systems
·Post Regulator for Switching Supplies
· 5V to 3.3V Logic Regulator


Pinout




Specifications

Input Voltage ...................................................... ±30V*
Output Pin Reverse Current ................................. 10mA
Sense Pin 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°C to 150°C
Operating Junction Temperature Range (Note 2)
LT1129C-X ............................................. 0°C to 125°C
LT1129C-X Extended Temperature Range
(Note 11) .......................................... 40°C to 125°C
LT1129I-X ......................................... 40°C to 125°C
Lead Temperature (Soldering, 10 sec)................ 300°C
* For applications requiring input voltage ratings greater than 30V, contact the factory.


Description

The LT1129/LT1129-3.3/LT1129-5 are micropower low dropout regulators with shutdown. The devices are capable of supplying 700mA of output current with a dropout voltage of 0.4V at maximum output. Designed for use in battery-powered systems the low quiescent current, 50A operating and 16mA in shutdown, make them an ideal choice. The quiescent current does not rise in dropout as it does with many other low dropout PNP regulators.

Other features of the LT1129 /LT1129-3.3/LT1129-5 include the ability to operate with small output capacitors. They are stable with only 3.3mF on the output while most older devices require between 10mF and 100mF for stability. Also the input may be connected to ground or a reverse voltage without reverse current flow from output to input. This makes the LT1129/LT1129-3.3/LT1129-5 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. The devices are available in 5-lead TO-220, 5-lead DD, and 3-lead SOT-223 packages.

Parameters:

Technical/Catalog Information	LT1129CQ-3.3
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Regulator Type	Single Output
Package / Case	D²Pak, SMD-220, TO-263 (5 leads + tab)
Packaging	Tube
Regulator Topology	Positive Fixed
Current - Output	700mA
Voltage - Output	3.3V
Operating Temperature	0°C ~ 125°C
Voltage - Input	4.3 ~ 20 V
Number of Regulators	1
Current - Limit (Min)	1.2A
Current Short Circuit (Isc)	-
Drawing Number	161; 05-08-1461; Q; 5
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LT1129CQ 3 3 LT1129CQ33