LTC1923| Datasheet

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FEATURES
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LTC1923 High Efficiency Thermoelectric Cooler Controller DESCRIPTIO
The LTC 1923 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 mo
nitoring.
, LTC and LT are registered trademarks of Linear Technology Corporation.

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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" 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

APPLICATIO S
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Laser-Based Fiber Optic Links Medical Instruments CPU Temperature Regulators

TYPICAL APPLICATIO
10k 0.1%

Laser Temperature Control Loop Achieving Setpoint Stability of 0.01 C
10k PLLLPF 82k REF 10k NTC TMP CMD LTC1658 VOUT RT CT VREF PDRVB NDRVB VDD LTC1923 1uF AGND SS ILIM VSET FAULT VTHRM C1, C2: TAIYO YUDEN JMK325BJ226MM-T (X7R) L1, L2: SUMIDA CDRH6D2B-220NC *MNA, MPA: SILICONIX Si9801 **MNB, MPB: SILICONIX Si9801 H/C VTEC PGND NDRVA PDRVA CS + CS ITEC TEC + TEC 4 3 1 RS 2 1uF MPA* L1 10uH C1 MNB** 22uF COOLER TEC L2 10uH C2 22uF MNA* VREF 330pF 1uF

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RSLEW VDD SDSYNC CNTRL EAOUT FB

REF LTC2053 A = 10 4.7uF 10M

100k

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U

VDD

10uF MPB**

1923 TA01

1923f

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LTC1923 DATASHEET