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Analog Devices Inc. LTC1923EGN#TRPBF
- Part No.:
- LTC1923EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1923EGN#TRPBF.pdf
- Description:
- IC CONTROLLER TEC HI EFF 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,271
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Product details
Overview
LTC1923EGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, bidirectional thermoelectric cooler (TEC) controller IC in 28-pin SSOP package. It integrates full-bridge gate drivers, differential current/voltage amplifiers, adjustable pulse-by-pulse current limiting, TEC voltage clamping, and open/shorted thermistor detection. Designed for laser diode temperature stabilization, it achieves 0.01°C setpoint stability with external instrumentation amplifier.
For engineers reviewing the LTC1923EGN#TRPBF datasheet, LTC1923EGN#TRPBF pinout, LTC1923EGN#TRPBF application, or LTC1923EGN#TRPBF equivalent, key selection criteria include bidirectional current control capability, 2.7V minimum operating voltage, 2.5V reference output, adjustable oscillator frequency (165–270 kHz), and independent heating/cooling current limit configuration.
Technical Context
The LTC1923EGN#TRPBF implements a constant-frequency, voltage-mode PWM architecture with dual complementary driver pairs (PDRVA/NDRVA and PDRVB/NDRVB) to drive external N-/P-channel MOSFETs in full-bridge topology. Its error amplifier (CNTRL/FB inputs, EAOUT output) compares thermistor-derived feedback against VSET to command duty-cycle modulation of opposing bridge legs.
Protection circuitry includes pulse-by-pulse current limiting via CS+/CS– differential sense amplifier (gain = 10), TEC voltage monitoring (VTEC output, gain = 1), direction detection (H/C open-drain output), and dual-window thermistor fault detection (VTHRM vs. 0.2×VSET and VSET – 410 mV). Oscillator frequency is set by RT/CT network with synchronization capability via SDSYNC and PLLLPF pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.7V to 5.5V - supports single-supply operation from 3.3V or 5V rails without level-shifting. |
| Oscillator Frequency | 165–270 kHz - adjustable via RT/CT; reduces EMI and enables compact LC filter design. |
| Reference Output | 2.5V ±1% - stable, low-drift reference for thermistor biasing and ILIM threshold setting. |
| Current Sense Gain | 10 V/V - provides 10× amplified representation of TEC current on ITEC pin for precise limit control. |
| TEC Voltage Amplifier | Gain = 1, offset ≤ ±7 mV - delivers accurate magnitude of VTEC+–VTEC– for thermal state monitoring. |
| Output Slew Control | RSLEW pin adjusts rise/fall time from 20 ns to 90 ns - directly reduces system EMI without external components. |
| Thermistor Fault Window | VTHRM valid range = 0.2×VSET to (VSET – 410 mV) - detects open/shorted NTC or RTD sensors before thermal runaway. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 5.3 mm × 10.2 mm, 0.65 mm pitch, exposed pad not present. Thermal resistance θJA = 120°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (1) | PLL low-pass filter input | Controls oscillator frequency when synchronized; >VDD–0.4V enables master mode for multi-device sync. |
| RSLEW (2) | Slew rate control | Resistor to AGND sets output transition speed; tie to VDD for max speed (20 ns). |
| SDSYNC (3) | Shutdown/sync control | Ground disables all outputs and asserts FAULT; can slave to external clock or act as sync master. |
| CNTRL (4) | Error amp non-inverting input | Connects to thermistor divider midpoint; sets temperature setpoint reference point. |
| EAOUT (5) | Error amplifier output | PWM comparator input; drives loop compensation network between EAOUT and FB. |
| FB (6) | Error amp inverting input | Connected to EAOUT via RC compensation; closes control loop around thermistor/TEC. |
| AGND (7) | Analog ground | Signal reference for CNTRL, FB, VTHRM, ILIM, VSET; bypass VDD/VREF near this pin. |
| SS (8) | Soft-start capacitor node | 1.5 µA charge current ramps TEC current linearly at startup; prevents inrush stress. |
| ILIM (9) | Current limit threshold adjust | Voltage divider from VREF sets peak current limit; enables independent heating/cooling limits. |
| VSET (10) | Thermistor bias reference | Provides bias voltage for thermistor divider network; defines fault window boundaries. |
| FAULT (11) | Open-drain fault indicator | Pulled low on UVLO, REF not good, or VTHRM out-of-window; requires external pull-up. |
| VTHRM (12) | Thermistor voltage monitor | Direct connection to thermistor divider output; fault detection based on absolute voltage window. |
| H/C (13) | Heating/Cooling direction flag | Open-drain output: low = cooling (TEC+ > TEC–), high = heating (TEC– > TEC+). |
| VTEC (14) | TEC voltage monitor | Differential amplifier output (gain = 1); magnitude of VTEC+–VTEC–, referenced to AGND. |
| TEC– (15) | TEC voltage inverting input | Inverting input of TEC voltage amp; connects directly to TEC– terminal. |
| TEC+ (16) | TEC voltage non-inverting input | Non-inverting input of TEC voltage amp; connects directly to TEC+ terminal. |
| ITEC (17) | TEC current monitor | 10× amplified sense voltage (CS+–CS–); used for current limiting and diagnostics. |
| CS– (18) | Current sense inverting input | Connects to low-side sense resistor (RS) return; differential pair with CS+. |
| CS+ (19) | Current sense non-inverting input | Connects to RS high-side; 10× gain enables accurate low-current limit thresholds. |
| PDRVA (20) | High-side A driver output | Drives gate of PMOS on "A" side of full bridge; complements NDRVA. |
| NDRVB (21) | Low-side B driver output | Drives gate of NMOS on "B" side; complements PDRVB; 100 mA sink capability. |
| PGND (22) | Power ground | High-current return path for MOSFET sources and RS; separate from AGND. |
| VDD (23) | Supply input | 2.7–5.5V main supply; UVLO threshold 2.6V with 130 mV hysteresis. |
| VREF (26) | 2.5V reference output | Stable 2.5V source; supplies ≥10 mA; short-circuit protected; bypass with 1 µF ceramic. |
| CT (27) | Oscillator timing capacitor | Triangular waveform node; frequency set jointly with RT; internal ramp 0.5–1.5 V. |
| RT (28) | Oscillator timing resistor | Resistor to AGND sets CT charge/discharge current; also controls dead time (90 ns @ 10 kΩ). |
Key Features
| Feature | Design Value |
|---|---|
| Full-bridge bidirectional control | Integrated complementary drivers (PDRVA/NDRVA, PDRVB/NDRVB) enable reversible TEC current without external logic. |
| Adjustable pulse-by-pulse current limit | Independent heating/cooling thresholds via ILIM and H/C; eliminates need for dual sense paths. |
| Differential TEC voltage monitoring | VTEC output provides real-time magnitude of VTEC+–VTEC– with <±7 mV offset for thermal state verification. |
| Open/shorted thermistor detection | Dual comparators monitor VTHRM against programmable window (0.2×VSET to VSET–410 mV) for fail-safe sensor integrity check. |
| TEC current soft-start | SS pin accepts capacitor charged at 1.5 µA, enabling linear TEC current ramp from zero to prevent mechanical shock. |
| EMI-reducing slew control | RSLEW pin allows resistor-based adjustment of output edge rates (20–90 ns), reducing conducted/radiated noise without layout changes. |
Applications
| Laser Diode Temperature Control | CPU Temperature Regulation |
|---|---|
Use Scenario: Stabilizing temperature of fiber-coupled laser diodes in telecom transceivers requiring <0.01°C setpoint stability over hours. IC Role / Device Role / Timing Role: LTC1923EGN#TRPBF acts as the core TEC driver and analog control loop engine, interfacing directly with NTC thermistor and external MOSFET bridge. Use Value: Achieves 0.01°C stability using instrumentation amplifier front-end and differential current sensing, minimizing wavelength drift in DFB lasers. | Use Scenario: Maintaining precise junction temperature of high-performance CPUs in test equipment or embedded computing platforms. IC Role / Device Role / Timing Role: LTC1923EGN#TRPBF serves as bidirectional TEC controller, accepting analog setpoint from microcontroller and delivering regulated heating/cooling power. Use Value: Enables rapid thermal response and tight regulation (<0.1°C accuracy) under dynamic CPU load, preventing thermal throttling during validation. |
| Medical Instrumentation | Fiber Optic Transceiver Modules |
Use Scenario: Controlling temperature of optical detectors or microfluidic assay chambers in portable diagnostic devices. IC Role / Device Role / Timing Role: LTC1923EGN#TRPBF functions as compact, low-noise TEC driver with integrated fault detection, ensuring safe operation in battery-powered medical hardware. Use Value: Open/shorted thermistor detection and FAULT output provide redundant safety for patient-critical thermal management. | Use Scenario: Regulating temperature of tunable lasers and modulators inside SFP+/QSFP pluggable modules compliant with MSA standards. IC Role / Device Role / Timing Role: LTC1923EGN#TRPBF operates as the analog TEC controller within space-constrained module PCBs, supporting 3.3V supply and minimal external components. Use Value: 5 mm × 10.2 mm SSOP footprint and <0.6″ × 0.8″ solution size meet strict module area budgets while delivering full protection features. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermoelectric cooler controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1968 | 32-pin QFN only; integrated 3.3V LDO; no VREF output; fixed 500 kHz oscillator; no RSLEW slew control. | Better suited for space-constrained designs needing integrated bias supply; lacks adjustable slew and reference output for precision thermistor biasing. | Select MAX1968 when board area is critical and external 3.3V rail is unavailable; avoid when 2.5V reference or EMI-sensitive layouts require slew tuning. |
| ADN8834 | 40-pin QFN; integrated 1.2V LDO; 12-bit DAC setpoint interface; digital I²C control; no analog CNTRL/FB loop. | Designed for microcontroller-based systems requiring programmable setpoints and telemetry; lacks direct analog loop for ultra-low-noise analog-only designs. | Select ADN8834 for digitally managed thermal systems with host processor; retain LTC1923EGN#TRPBF for analog-loop simplicity, low-jitter performance, and minimal component count. |
Compared with MAX1968 and ADN8834, the LTC1923EGN#TRPBF offers unique analog loop fidelity, adjustable slew control for EMI reduction, and a dedicated 2.5V reference-making it optimal for high-stability laser temperature control where digital overhead or fixed-frequency switching are undesirable.
Availability
LTC1923EGN#TRPBF is available at Aetrix Electronics and suitable for laser diode temperature control, CPU thermal regulation, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1923EGN#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1923EGN#TRPBF belongs to ADI's precision thermal management product line, engineered specifically for demanding applications requiring sub-0.1°C temperature stability, bidirectional TEC control, and integrated fault protection in compact form factors.
FAQ
What is the minimum operating voltage for the LTC1923EGN#TRPBF?
The LTC1923EGN#TRPBF has a minimum operating supply voltage of 2.7V, with undervoltage lockout (UVLO) activating below 2.6V (with 130 mV hysteresis). This allows reliable operation from standard 3.3V rails and compatibility with battery-backed systems down to ~2.8V under load. The LTC1923EGN#TRPBF maintains full functionality-including reference output, current limiting, and fault detection-across the 2.7V to 5.5V range.
How does the LTC1923EGN#TRPBF implement independent heating and cooling current limits?
The LTC1923EGN#TRPBF uses the H/C pin state to dynamically reconfigure the current limit threshold via an external NMOS transistor (e.g., 2N7002) and resistor network on the ILIM pin. When H/C is low (cooling mode), the transistor is off and ILIM sets a higher limit; when H/C is high (heating mode), the transistor turns on and lowers the effective threshold. This enables asymmetric current limiting without additional ICs. The LTC1923EGN#TRPBF datasheet provides Figure 4 showing the exact implementation.
Can the LTC1923EGN#TRPBF be synchronized to an external clock?
Yes, the LTC1923EGN#TRPBF supports external synchronization via the SDSYNC pin. When driven with a clean square wave, the internal oscillator locks to the external frequency using the phase detector and PLLLPF filter pin. The part can also operate as a master, pulling SDSYNC low during each CT charging cycle to synchronize other LTC1923EGN#TRPBF devices on the same board. This eliminates beat frequencies and reduces system-level EMI in multi-channel thermal control systems.
What is the purpose of the VTEC pin on the LTC1923EGN#TRPBF?
The VTEC pin on the LTC1923EGN#TRPBF outputs the differential voltage across the TEC (VTEC+ – VTEC–) with unity gain and ≤±7 mV offset. It provides real-time, polarity-insensitive monitoring of TEC voltage magnitude for diagnostics, closed-loop verification, and safety interlocks. Unlike raw TEC+ or TEC– signals, VTEC is referenced to AGND and immune to common-mode noise, making it ideal for validating TEC health and detecting open-circuit failures in the TEC itself.
Does the LTC1923EGN#TRPBF require external compensation components for stable operation?
Yes, the LTC1923EGN#TRPBF requires external compensation between EAOUT and FB pins to stabilize the analog temperature control loop. A typical network includes a series RC (e.g., 100 kΩ + 100 pF) from EAOUT to FB, plus a capacitor (e.g., 1 nF) from FB to AGND. This compensates the error amplifier's open-loop response and ensures phase margin >45° across operating conditions. The LTC1923EGN#TRPBF datasheet provides detailed guidance and Bode plot examples in the Applications Information section.
LTC1923EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Thermoelectric Cooler/Heater
- Current - Supply:
- 2mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1923EGN#TRPBF FAQ
1.How can I place an order for LTC1923EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1923EGN#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1923EGN#TRPBF reliable?
The price and inventory of LTC1923EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1923EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1923EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1923EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1923EGN#TRPBF?
LTC1923EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1923EGN#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1923EGN#TRPBF?
For technical support, including LTC1923EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1923EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1923EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1923EGN#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1923EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1923EGN#TRPBF?
All LTC1923EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1923EGN#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1923EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1923EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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