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Micropower Low Dropout Regulators with Shutdown

Manufacturer : Analog Devices, Inc
Package/Case : TO-263
Product Categories : Driver IC
Datasheet: LT1129CQ-5 Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
In-stock: 2937


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LT1129CQ-5 Product Details

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 400mV at maximum output. Designed for use in battery-powered systems, the low quiescent current, 50μA operating and 16μA 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 3.3μF on the output while most older devices require between 10μF and 100μF 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 16μA will flow from the output pin to ground. The devices are available in 5-lead TO-220, 5-lead DD-Pak and 3-lead SOT-223 packages.


  • 400mV Dropout Voltage
  • 700mA Output Current
  • 50μA 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
  • 16μA Quiescent Current in Shutdown
  • Stable with 3.3μF Output Capacitor
  • Reverse Battery Protection
  • No Reverse Output Current
  • Thermal Limiting
  • Surface Mount SOT-223 and DD-Pak Packages


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

LT1129CQ-5 Pinout
(Picture: Pinout)

LT1129CQ-5 Block Diagram
(Picture: Diagram)

Technical Parameters

  • Number of Outputs
  • 1
  • Vinmin | V
  • 4.15
  • Vinmax | V
  • 30
  • Output Currenttyp | A
  • 700m
  • Output Current 2typ | A
  • -
  • Output Voltage
  • 3.3, 5, Adj
  • RMS Noisetyp | V
  • -
  • Isupplytyp | A
  • 50µ
  • Dropout Voltagetyp | V
  • 450m
  • Features
  • Shutdown

LT1129CQ-5 Datasheet

  • LT1129 Technical Documentation/Data sheet

LT1129CQ-5 Related Products

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Analog Devices, Inc

Analog Devices, Inc. was founded by two MIT graduates, Ray Stata and Matthew Lorber in 1965. The same year, the company released its first product, the model 101 op amp, which was a hockey-puck sized module used in test and measurement equipment. In 1967, the company published the first issue of its...
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