LTC1923

PRODUCTION

High Efficiency Thermoelectric Cooler Controller

Part Models: 4
1ku List Price: Starting From $21.51

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Overview

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" x 0.8"
(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

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.

Applications

Laser-Based Fiber Optic Links
Medical Instruments
CPU Temperature Regulators

Part Models: 4
1ku List Price: Starting From $21.51

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC1923EGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1923EGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1923EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1923EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC1923EGN#PBF	PRODUCTION
LTC1923EGN#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC1923EGN#PBF	PRODUCTION
LTC1923EGN#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC1923EUH#PBF	PRODUCTION
LTC1923EUH#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC1923EUH#PBF	PRODUCTION
LTC1923EUH#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

LTC1923EGN | TEC Temperature Controller, 2.7-6.0 VIN

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Product Details

Demonstration circuit DC388 utilizes the LTC1923 thermoelectric cooler (TEC) controller. It provides a complete temperature control solution for TEC based temperature control of fiber-optic lasers. Laser temperature may be controlled at temperatures above or below ambient with set point stability typically well within .05º C over widely varying ambient temperature. Temperature set point is established with a screwdriver driven potentiometer or a 14-bit on-board DAC. Considerably more detail relating to TEC temperature control issues is available in LTC Application Note AN-89, “A Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers.” This publication should be reviewed before demo board results are evaluated.