LTC1923 - High Efficiency Thermoelectric Cooler Controller
Features
- 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
Description
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.
Packaging
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 Drawing |
RoHS |
|---|---|---|---|---|---|
| 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 |
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 (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| 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 | ||
| Buy Now • Request Samples | ||||||
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 | |
| Buy Now | |||
Applications
- 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:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
