LTC1923 - High Efficiency Thermoelectric Cooler Controller


  • High Efficiency, Low Noise Topology
  • Adjustable Output Slew Rate Reduces EMI
  • Full-Bridge Controller for Bidirectional Current Control
  • Adjustable Pulse-by-Pulse Bidirectional TEC Current Limit
  • Open/Shorted Thermistor Indication
  • Solution Footprint in Less Than
    0.6 inches x 0.8 inches
    (Double-Sided PCB)
  • Available in 5mm x 5mm QFN and 28-Pin SSOP Packages
  • TEC Voltage Clamping
  • TEC Current, Voltage and Heat/Cool Status Outputs
  • Adjustable/Synchronizable Oscillator Frequency Reduces Filter Component Size and System Noise
  • 2.5V Reference Voltage Output
  • 2.7V Minimum Operating Voltage

Typical Application

LTC1923 Typical Application


The LTC1923 is a pulse width modulator intended for thermoelectric cooler (TEC) or heater applications requiring either unidirectional or bidirectional drive circuits. All of the necessary control circuitry and two sets of complementary output drivers are integrated into the LTC1923 to drive a full bridge, providing an efficient means of bidirectional current flow to the TEC. An accurate temperature control loop to stabilize the temperature of a laser diode system is easily achieved with the addition of just a few external components. Typical temperature setpoint accuracy of 0.1°C is achievable with the LTC1923. Adding an instrumentation amplifier front end allows setpoint stability of 0.01°C.

The part features independent adjustable heating and cooling pulse-by-pulse current limit, current soft-start for controlled start-up, output slew rate control to reduce system noise, differential current sense and voltage amplifiers and a host of auxiliary circuits to protect the laser and provide redundant system monitoring.


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
LTC1923EGN#PBF SSOP-28 GN E 05-08-1641 (GN28) Yes
LTC1923EGN#TRPBF SSOP-28 GN E 05-08-1641 (GN28) Yes
LTC1923EUH#PBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC1923EUH#TRPBF 5x5 QFN-32 UH E 05-08-1693 Yes

LTC1923 Package Drawing
LTC1923 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
LTC1923EGN#PBF SSOP-28 E $21.52 $18.17 Yes
LTC1923EGN#TRPBF SSOP-28 E $18.27 Yes
LTC1923EUH#PBF 5x5 QFN-32 E $28.07 $18.47 Yes
LTC1923EUH#TRPBF 5x5 QFN-32 E $18.57 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.

Part Number Description Price Documentation
DC388C LTC1923EGN | TEC Temperature Controller, 2.7-6.0 Vin $125.00
DC491A LTC1923EUH | TEC Temperature Controller, 1.0MHz Switching Frequency, 2.7-5.5V Input $125.00
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Click here to view our complete list of demo boards


  • Laser-Based Fiber Optic Links
  • Medical Instruments
  • CPU Temperature Regulators

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

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