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Analog Devices Inc. LTC1923EUH#PBF
- Part No.:
- LTC1923EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1923EUH#PBF.pdf
- Description:
- IC THERMOELEC COOLER CNTRLR32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:442
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Product details
Overview
LTC1923EUH#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, bidirectional thermoelectric cooler (TEC) controller IC in a 32-lead 5mm × 5mm QFN package. It integrates dual full-bridge gate drivers, differential current/voltage amplifiers, adjustable slew-rate control, pulse-by-pulse current limiting, and open/shorted thermistor detection. Designed for laser diode temperature stabilization achieving ±0.01°C setpoint stability, it operates from 2.7V to 5.5V and supports oscillator frequencies from 165kHz to 270kHz.
For engineers reviewing the LTC1923EUH#PBF datasheet, LTC1923EUH#PBF pinout, LTC1923EUH#PBF application, or LTC1923EUH#PBF equivalent, key selection criteria include bidirectional TEC current control capability, independent heating/cooling current limit adjustment, TEC voltage clamping, integrated 2.5V reference with ±10mV accuracy over temperature, and fault signaling via open-drain FAULT output tied to thermistor window violation or UVLO.
Technical Context
The LTC1923EUH#PBF implements a constant-frequency, voltage-mode PWM control architecture with a triangle-wave oscillator synchronized via RT/CT network. Its error amplifier drives the PWM comparator against the CT ramp, generating complementary duty cycles for two full-bridge legs (A-side and B-side), enabling precise bidirectional current flow through the TEC.
Protection is implemented at circuit level: pulse-by-pulse current limiting uses a 10× differential CS amplifier feeding a comparator with three programmable thresholds (SS, ILIM, fixed 1.5V); thermistor integrity is verified by dual comparators monitoring VTHRM against 0.2×VSET (lower) and VSET – 410mV (upper); H/C output provides real-time direction indication based on TEC+ vs TEC– polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V - enables direct operation from common 3.3V or 5V rails without LDO overhead |
| Oscillator Frequency | 165kHz to 270kHz - adjustable via RT/CT; reduces EMI and allows smaller external filter inductors |
| Reference Voltage | 2.5V ±10mV (G range) - stable, low-drift reference for precision thermistor biasing and current limit scaling |
| Current Sense Gain | 10 V/V - converts 100mV across sense resistor RS to 1V on ITEC pin, supporting accurate 150mV threshold-based limiting |
| TEC Voltage Amplifier Gain | 0.98 to 1.02 V/V - near-unity gain with <7mV offset ensures accurate VTEC measurement for thermal feedback |
| Output Slew Control | Adjustable via RSLEW pin (10k–300kΩ to AGND) - enables EMI reduction without sacrificing transient response |
| Thermistor Fault Window | VTHRM < 0.2×VSET or > (VSET – 410mV) - detects open-circuit (low VTHRM) or short-circuit (high VTHRM) thermistor conditions |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm, 0.5mm pitch), exposed PGND pad requiring soldering to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TEC+, TEC– | Differential inputs to TEC voltage amplifier | Directly monitor TEC terminal voltage; polarity determines H/C output state and bridge direction |
| CS+, CS– | Differential inputs to current sense amplifier | Measure voltage across external sense resistor RS; output ITEC = 10×(CS+ − CS–) |
| PDRVA, PDRVB, NDRVA, NDRVB | Full-bridge gate drive outputs | Drive high-side PMOS and low-side NMOS switches in complementary A/B leg pairs; support bidirectional TEC current |
| H/C | Open-drain direction indicator | Logic low when TEC+ > TEC– (cooling mode); logic high when TEC– > TEC+ (heating mode) |
| FAULT | Open-drain fault flag | Pulled low on thermistor window violation, UVLO, or VREF fault - requires external pull-up for system-level shutdown |
| VREF | 2.5V reference output | Stable, buffered reference used for VSET biasing, ILIM scaling, and external circuitry; supplies ≥10mA |
| RSLEW | Slew rate control input | Resistor-to-AGND sets output transition speed; tie to VDD to disable slew limiting |
| SDSYNC | Shutdown/synchronization input | Grounding disables all drivers and asserts FAULT; also enables master/slave oscillator sync |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional full-bridge control | Integrated complementary A/B leg drivers enable reversible TEC current without external logic or timing circuits |
| Independent heating/cooling current limit | ILIM and H/C pins allow separate current limit thresholds for heating vs cooling modes using one external NMOS |
| Programmable output slew rate | RSLEW pin adjusts rise/fall times from 20ns to 90ns - reduces EMI while maintaining fast thermal response |
| Thermistor health monitoring | Dual comparators detect open (VTHRM < 0.2×VSET) or shorted (VTHRM > VSET – 410mV) thermistor faults before thermal runaway occurs |
| Soft-start with linear current ramp | SS pin accepts capacitor charged by internal 1.5µA source - prevents inrush current and mechanical stress on TEC |
Applications
| Laser Diode Temperature Control | CPU Core Thermal Regulation |
|---|---|
Use Scenario: Stabilizing temperature of fiber-optic transmitter laser diodes in telecom modules to maintain wavelength accuracy and output power. IC Role / Device Role / Timing Role: LTC1923EUH#PBF acts as the primary TEC driver and analog control loop core, interfacing directly with NTC thermistor and external MOSFET bridge. Use Value: Enables ±0.01°C setpoint stability via differential current sensing, low-offset amplifiers, and noise-immune PWM architecture - critical for DWDM channel spacing. | Use Scenario: Regulating die temperature of high-performance x86 or ARM processors during dynamic workload changes in embedded computing systems. IC Role / Device Role / Timing Role: LTC1923EUH#PBF serves as the bidirectional TEC controller, accepting analog temperature feedback and driving full-bridge to heat or cool CPU package as needed. Use Value: Prevents thermal throttling by actively managing junction temperature within ±0.1°C, extending sustained turbo frequency duration and improving reliability. |
| Medical Laser Systems | Optical Coherence Tomography (OCT) |
Use Scenario: Maintaining precise temperature of surgical-grade diode lasers used in dermatology and ophthalmology equipment. IC Role / Device Role / Timing Role: LTC1923EUH#PBF functions as the closed-loop TEC actuator, receiving setpoint from microcontroller and delivering controlled bidirectional current to medical-grade TEC module. Use Value: Delivers <0.01°C peak-to-peak variation over time - ensures consistent laser output power and beam quality required for FDA-compliant devices. | Use Scenario: Stabilizing superluminescent diode (SLD) or swept-source laser temperature in portable OCT imaging systems. IC Role / Device Role / Timing Role: LTC1923EUH#PBF provides low-noise, high-stability TEC control with integrated fault detection to protect expensive light sources during field use. Use Value: Achieves 0.002°C peak-to-peak stability in cooling mode - eliminates thermal drift artifacts in micron-resolution depth scans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermoelectric cooler controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1968EUB+ | Higher max supply voltage (12V), integrated charge pump for high-side gate drive, no VREF output, different pinout and control interface | Better suited for higher-voltage TECs (>6V) and space-constrained designs needing self-contained gate drive | Select MAX1968EUB+ when driving >6V TECs or requiring integrated charge pump; LTC1923EUH#PBF preferred for 3.3V/5V systems with external MOSFET flexibility and precision reference |
| ADN8834ACPZ-R7 | Single-ended output architecture (not full-bridge), integrated DAC for digital setpoint, lower quiescent current (1.2mA), no H/C direction output | Designed for unidirectional TEC control or heater-only applications with digital interface requirements | Choose ADN8834ACPZ-R7 for digital-setpoint, low-power, unidirectional systems; LTC1923EUH#PBF remains optimal for analog-controlled bidirectional TECs demanding highest thermal stability |
Compared with MAX1968EUB+ and ADN8834ACPZ-R7, the LTC1923EUH#PBF uniquely combines full-bridge analog control, independent heating/cooling current limits, integrated 2.5V reference, and thermistor fault detection in a compact QFN - making it the most suitable choice for high-stability laser diode temperature regulation where analog precision and bidirectional capability are mandatory.
Availability
LTC1923EUH#PBF is available at Aetrix Electronics and suitable for laser diode temperature control, medical laser systems, CPU thermal regulation, and optical coherence tomography requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1923EUH#PBF 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, serving industrial, automotive, communications, and healthcare markets.
The LTC1923EUH#PBF belongs to ADI's precision thermal management product line, engineered specifically for ultra-stable temperature control of optoelectronic components using thermoelectric coolers - emphasizing low noise, bidirectional current control, and robust fault protection.
FAQ
What is the minimum operating voltage for the LTC1923EUH#PBF?
The LTC1923EUH#PBF has a guaranteed minimum operating supply voltage of 2.7V, with undervoltage lockout (UVLO) releasing at 2.6V (±130mV hysteresis). Operation below 2.7V may result in undefined behavior or loss of regulation. The device draws only 2mA typical quiescent current at 5V, making it suitable for battery-backed or low-power thermal control systems where LTC1923EUH#PBF must remain functional down to near-3V rail levels.
How does the LTC1923EUH#PBF implement bidirectional current control for TECs?
The LTC1923EUH#PBF implements bidirectional current control using two complementary full-bridge driver pairs (PDRVA/NDRVA and PDRVB/NDRVB) that alternately energize opposite legs of an external H-bridge. When EAOUT < CT ramp, "A-side" drives active (PDRVA low, NDRVA high); when EAOUT > CT ramp, "B-side" activates (PDRVB low, NDRVB high). The resulting differential duty cycle (DA – DB) determines average TEC voltage polarity and magnitude - enabling seamless heating or cooling without external logic. This architecture is central to LTC1923EUH#PBF's ability to achieve ±0.01°C stability.
Can the LTC1923EUH#PBF be synchronized to an external clock?
Yes, the LTC1923EUH#PBF supports external synchronization via the SDSYNC pin. When configured as a slave, an external clock applied to SDSYNC overrides the internal RT/CT oscillator and aligns switching edges to reduce beat frequencies and system-level EMI. The PLLLPF pin allows multiple LTC1923EUH#PBF devices to operate coherently as masters or slaves. This capability is documented in the LTC1923EUH#PBF datasheet Figure 10 and is essential for multi-channel laser modules where clock domain alignment prevents interference.
What protection features does the LTC1923EUH#PBF include for TEC and system safety?
The LTC1923EUH#PBF integrates four hardware-level protections: (1) Pulse-by-pulse current limiting using CS+/CS– inputs with three programmable thresholds; (2) Open/shorted thermistor detection via VTHRM window comparators; (3) Undervoltage lockout (UVLO) with 2.6V turn-on threshold; (4) TEC voltage clamping to prevent overvoltage damage. All fault conditions assert the open-drain FAULT pin, enabling external shutdown. These features are intrinsic to LTC1923EUH#PBF's design and require no firmware or external supervision to function.
Is the 2.5V reference output on the LTC1923EUH#PBF buffered and load-capable?
Yes, the VREF pin on the LTC1923EUH#PBF provides a fully buffered 2.5V reference with ±10mV accuracy over temperature, capable of sourcing ≥10mA continuously and surviving short-circuit conditions due to internal current limiting. It exhibits ≤25mV load regulation from –1mA to –10mA and ≤20mV line regulation across 2.7V–5.5V VDD. This makes LTC1923EUH#PBF's VREF suitable for biasing thermistor dividers, scaling ILIM thresholds, and powering external instrumentation amplifiers - eliminating need for a separate reference IC.
LTC1923EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 32-QFN (5x5)
LTC1923EUH#PBF FAQ
1.How can I place an order for LTC1923EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1923EUH#PBF 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 LTC1923EUH#PBF reliable?
The price and inventory of LTC1923EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1923EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC1923EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1923EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1923EUH#PBF?
LTC1923EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1923EUH#PBF 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 LTC1923EUH#PBF?
For technical support, including LTC1923EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1923EUH#PBF requirements.
6.How does Aetrix verify that LTC1923EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1923EUH#PBF 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 LTC1923EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC1923EUH#PBF?
All LTC1923EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1923EUH#PBF, 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 LTC1923EUH#PBF part is unused and in its original packaging.
Return procedure for LTC1923EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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