LT1073 - Micropower DC-DC Converter Adjustable and Fixed 5V, 12V


  • No Design Required
  • Operates at Supply Voltages From 1.0V to 30V
  • Consumes Only 95µA Supply Current
  • Works in Step-Up or Step-Down Mode
  • Only Three External Off-the-Shelf Components Required
  • Low-Battery Detector Comparator On-Chip
  • User-Adjustable Current Limit
  • Internal 1A Power Switch
  • Fixed or Adjustable Output Voltage Versions
  • Space-Saving 8-Pin MiniDIP or SO8 Package

Typical Application

LT1073 Typical Application
LT1073 Typical Application


The LT1073 is a versatile micropower DC/DC converter. The device requires only three external components to deliver a fixed output of 5V or 12V. The very low minimum supply voltage of 1V allows the use of the LT1073 in applications where the primary power source is a single cell. An on-chip auxiliary gain block can function as a low-battery detector or linear post-regulator.

Average current drain of the LT1073-5 used as shown in the Typical Application circuit below is just 135µA unloaded, making it ideal for applications where long battery life is important. The circuit shown can deliver 5V at 40mA from an input as low as 1.25V and 5V at 10mA from a 1V input.

The device can easily be configured as a step-up or step-down converter, although for most step-down applications or input sources greater than 3V, the LT1173 is recommended. Switch current limiting is user-adjustable by adding a single external resistor. Unique reverse-battery protection circuitry limits reverse current to safe, nondestructive levels at reverse supply voltages up to 1.6V.


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
LT1073CN8-12#PBF N-8 N C 05-08-1510 (N8) Yes
LT1073CN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LT1073CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1073CS8-12#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1073CS8-5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1073CS8-5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1073CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1073CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes

LT1073 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
LT1073CN8-12#PBF N-8 C $3.67 $3.00 Yes
LT1073CN8-5#PBF N-8 C $3.67 $3.00 Yes
LT1073CN8#PBF N-8 C $3.67 $3.00 Yes
LT1073CS8-12#PBF SO-8 C $4.25 $3.45 Yes
LT1073CS8-5#PBF SO-8 C $4.25 $3.45 Yes
LT1073CS8-5#TRPBF SO-8 C $3.51 Yes
LT1073CS8#PBF SO-8 C $4.25 $3.45 Yes
LT1073CS8#TRPBF SO-8 C $3.51 Yes
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* 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.

Click here to view our complete list of demo boards


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