LT1964 - 200mA, Low Noise, Low Dropout Negative Micropower Regulator


  • Low Noise: 30µVRMS (10Hz to 100kHz)
  • Low Quiescent Current: 30µA
  • Low Dropout Voltage: 340mV
  • Output Current: 200mA
  • Fixed Output Voltage: -5V
  • Adjustable Output from -1.22V to -20V
  • Positive or Negative Shutdown Logic
  • 3µA Quiescent Current in Shutdown
  • Stable with 1µF Output Capacitor
  • Stable with Aluminum, Tantalum, or Ceramic Capacitors
  • Thermal Limiting
  • Low Profile (1mm) ThinSOT and (0.75mm) 8-Pin
    3mm × 3mm DFN Packages

Typical Application

LT1964 Typical Application
LT1964 Typical Application


The LT1964 is a micropower low noise, low dropout negative regulator. The device is capable of supplying 200mA of output current with a dropout voltage of 340mV. Low quiescent current (30µA operating and 3µA shutdown) makes the LT1964 an excellent choice for battery-powered applications. Quiescent current is well controlled in dropout.

Other features of the LT1964 include low output noise. With the addition of an external 0.01µF bypass capacitor, output noise is reduced to 30µVRMS over a 10Hz to 100kHz bandwidth. The LT1964 is capable of operating with small capacitors and is stable with output capacitors as low as 1µF. Small ceramic capacitors can be used without the necessary addition of ESR as is common with other regulators. Internal protection circuitry includes reverse output protection, current limiting, and thermal limiting. The device is available with a fixed output voltage of -5V and as an adjustable device with a -1.22V reference voltage. The LT1964 regulators are available in a low profile (1mm) ThinSOT and the low profile (0.75mm) 8-pin
(3mm × 3mm) DFN packages.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT1964EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT1964EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT1964ES5-5#PBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-5#TRPBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-BYP#PBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-BYP#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-BYP#TRPBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-SD#PBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-SD#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LT1964ES5-SD#TRPBF SOT-23 S5 E 05-08-1635 Yes
LT1964IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT1964IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT1964IS5-5#PBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-5#TRMPBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-5#TRPBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-BYP#PBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-BYP#TRMPBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-BYP#TRPBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-SD#PBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-SD#TRMPBF SOT-23 S5 I 05-08-1635 Yes
LT1964IS5-SD#TRPBF SOT-23 S5 I 05-08-1635 Yes

LT1964 Package Drawing
LT1964 Package Drawing
LT1964 Package Drawing
LT1964 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT1964EDD#PBF 3x3 DFN-8 E $2.16 $1.51 Yes
LT1964EDD#TRPBF 3x3 DFN-8 E $1.57 Yes
LT1964ES5-5#PBF SOT-23 E $2.02 Yes
LT1964ES5-5#TRMPBF SOT-23 E $2.02 $1.46 Yes
LT1964ES5-5#TRPBF SOT-23 E $2.02 $1.41 Yes
LT1964ES5-BYP#PBF SOT-23 E $2.02 Yes
LT1964ES5-BYP#TRMPBF SOT-23 E $2.02 $1.46 Yes
LT1964ES5-BYP#TRPBF SOT-23 E $2.02 $1.41 Yes
LT1964ES5-SD#PBF SOT-23 E $2.02 Yes
LT1964ES5-SD#TRMPBF SOT-23 E $2.02 $1.46 Yes
LT1964ES5-SD#TRPBF SOT-23 E $2.02 $1.41 Yes
LT1964IDD#PBF 3x3 DFN-8 I $2.49 $1.74 Yes
LT1964IDD#TRPBF 3x3 DFN-8 I $1.80 Yes
LT1964IS5-5#PBF SOT-23 I $2.31 Yes
LT1964IS5-5#TRMPBF SOT-23 I $2.31 $1.67 Yes
LT1964IS5-5#TRPBF SOT-23 I $2.31 $1.62 Yes
LT1964IS5-BYP#PBF SOT-23 I $2.31 Yes
LT1964IS5-BYP#TRMPBF SOT-23 I $2.31 $1.67 Yes
LT1964IS5-BYP#TRPBF SOT-23 I $2.31 $1.62 Yes
LT1964IS5-SD#PBF SOT-23 I $2.31 Yes
LT1964IS5-SD#TRMPBF SOT-23 I $2.31 $1.67 Yes
LT1964IS5-SD#TRPBF SOT-23 I $2.31 $1.62 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC437A LT1964ES56 Demo Board | Negative Low Noise LDO Regulator, -2.3V ≤ VIN ≤ -20V, Vout = -1.22V/-5V @ 200mA $75.00
Buy Now
Click here to view our complete list of demo boards


  • Battery-Powered Instruments
  • Low Noise Regulator for Noise-Sensitive Instrumentation
  • Negative Complement to LT1761 Family of Positive LDOs

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:

Technical Support