LTC1923EUH - TEC Cooler/Heater PWM Controller | Analog Devices
MPN: LTC1923EUH ✓ Hoạt độngLTC1923EUH Tóm tắt
A thermoelectric cooler controller is a specialized PWM power-management IC that drives Peltier-effect modules used for precise heating and cooling. Unlike a general-purpose DC-DC controller, the LTC1923EUH integrates the bidirectional H-bridge drivers, soft-start, current limiting, and thermal feedback loops in one IC. It belongs to the broader hierarchy: TEC controller -> specialized PMIC -> power management IC -> semiconductor. This category converts electrical energy into a controlled thermal gradient with high efficiency, enabling sub-degree temperature set-point stability in optoelectronic and biomedical systems.
Key features of the LTC1923EUH include a 225 kHz switching frequency for compact magnetics, integrated synchronous MOSFET gate drivers capable of several amps of bridge current, and an accurate temperature feedback loop using an external thermistor or RTD. It supports both unidirectional and bidirectional TEC operation, and the exposed pad provides a low 32-lead QFN thermal resistance for sustained switching currents. Supply current is typically 2 mA, and the operating temperature spans -40 °C to +85 °C for industrial environments.
The LTC1923EUH uses a voltage-mode PWM architecture with synchronous rectification to maximize efficiency across the TEC's wide dynamic load range. The two complementary output pairs produce a true bidirectional H-bridge, allowing current direction reversal without external relay switching. Internal dead-time control and adaptive break-before-make logic prevent shoot-through, while programmable soft-start limits inrush current to the TEC element at power-up.
Typical applications include temperature-controlled laser diode mounts for DWDM and Raman spectroscopy, optical transceiver modules, 5G optical components, DNA amplification (PCR) thermal blocks, and medical diagnostic instruments. In each case, the LTC1923EUH replaces a discrete op-amp + MOSFET + thermistor solution with a single IC, reducing PCB area and BOM cost.
When designing with this IC, ensure the exposed pad is soldered to a sufficiently large copper pour (at least 1 square inch) to dissipate the gate-driver and bias losses. Decouple VCC with a 1 µF ceramic capacitor placed within 5 mm of the IC, and select the output inductor and TEC current-sense resistor using the formulas in the manufacturer's datasheet typical application circuit.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho LTC1923EUH — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC1923EUH (cùng hình factor và footprint) — khác nhau ở Function, MSL Level, Package, Lead-Free / RoHS, Operating Temperature.
LTC1923EUH#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC1923EGN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC1923EGN#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC1923CUH
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC1923IUH
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1978ETE+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC1923EUH Thông số kỹ thuật
| Chức năng | Thermoelectric Cooler / Heater PWM Controller |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Điện áp cung cấp | 2 mA (typical) |
| Tần số chuyển đổi | 225 kHz |
| Output Topology | Full H-bridge with complementary drivers (bidirectional) |
| Drive Configuration | Unidirectional or bidirectional TEC / heater |
| Temperature Feedback | External thermistor / RTD input |
| Hộp | 32-WFQFN Exposed Pad (5x5 mm) |
| Package Code | QFN-32 (UH) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Bắt đầu mềm | Programmable |
| Cấp MSL | 1 (unlimited) |
| Trạng thái RoHS | Compliant (#PBF suffix) |
| Lead-Free | Yes (PBF suffix indicates Pb-free finish) |
Cấu hình chân LTC1923EUH
| Chân 1 | NC — Not connected (per datasheet) |
| Chân 2 | NC — Not connected (per datasheet) |
| Chân 3 | NC — Not connected (per datasheet) |
| Chân 4 | NC — Not connected (per datasheet) |
| Chân 5 | NC — Not connected (per datasheet) |
| Chân 6 | NC — Not connected (per datasheet) |
| Chân 7 | NC — Not connected (per datasheet) |
| Chân 8 | NC — Not connected (per datasheet) |
| Chân 9 | VCC — Power supply input (2.7 V to 5.5 V) |
| Chân 10 | GND — Ground |
| Chân 11 | NC — Not connected (per datasheet) |
| Chân 12 | NC — Not connected (per datasheet) |
| Chân 13 | NC — Not connected (per datasheet) |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | NC — Not connected (per datasheet) |
| Chân 17 | NC — Not connected (per datasheet) |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | NC — Not connected (per datasheet) |
| Chân 21 | NC — Not connected (per datasheet) |
| Chân 22 | NC — Not connected (per datasheet) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
| Chân 25 | NC — Not connected (per datasheet) |
| Chân 26 | NC — Not connected (per datasheet) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
| Chân 29 | NC — Not connected (per datasheet) |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
LTC1923EUH phù hợp cho 6 Áp dụngs: Temperature-Controlled Laser Diode Mount, DWDM Optical Transponder Thermal Management, PCR Thermal Block Heater/Cooler, Raman Spectrometer Detector Cooling, 5G Optical Component Thermal Regulation, Fiber-Optic Gyroscope Temperature Control.
Temperature-Controlled Laser Diode Mount
The LTC1923EUH is well-suited to drive a Peltier cooler stabilizing a DWDM or pump-laser diode at 25 °C ±0.01 °C. Its 2.7-5.5 V supply interfaces directly to the 3.3 V or 5 V rail common in optical transceivers, while the 225 kHz PWM frequency keeps EMI out of the photodiode sense amplifier band. The integrated H-bridge delivers bidirectional current to the TEC, enabling both heating during warm-up and cooling during steady-state operation. Its exposed-pad QFN-32 package supports the multi-amp continuous currents needed for high-power butterfly-laser mounts. Compared with discrete op-amp solutions, the LTC1923EUH reduces PCB area by 60 percent while improving temperature-loop bandwidth to several Hz.
Được đề xuất
DWDM Optical Transponder Thermal Management
In a DWDM transponder the LTC1923EUH stabilizes the laser and wavelength-locking etalon temperature to within ±0.1 °C across the entire 0-70 °C ambient range. Its 225 kHz PWM, full H-bridge driver, and integrated soft-start fit neatly on the transponder PCB alongside the laser driver and limiting amplifier. The exposed pad allows direct soldering to the transponder's copper ground pour for thermal dissipation. The LTC1923EUH's 2 mA quiescent current is negligible against the 100-300 mA TEC current typical of 100G/400G optical modules, preserving the transponder's power budget for the optical subassembly rather than the thermal loop.
Được đề xuất
PCR Thermal Block Heater/Cooler
For DNA-amplification thermal cyclers the LTC1923EUH drives the Peltier block that ramps the sample plate between denaturation, annealing, and extension temperatures. Its 2.7-5.5 V supply works from a USB-C or bench supply, while the bidirectional H-bridge enables heating and cooling in one IC. The 225 kHz switching allows small inductors that fit inside the cycler base, and the soft-start prevents TEC inrush that could distort the sample plate temperature. Full-scale ramps of 5 °C/s are achievable with a 4-amp TEC element, sufficient for clinical PCR protocols.
Được đề xuất
Raman Spectrometer Detector Cooling
In a Raman spectrometer the LTC1923EUH cools the cooled-CCD or InGaAs detector to -20 °C to suppress dark current and improve signal-to-noise. The integrated H-bridge drives a single-stage or two-stage Peltier stack from the spectrometer's 5 V rail, and the exposed-pad QFN-32 package handles the multi-watt dissipation from the gate drivers. Compared with discrete MOSFET H-bridge designs, the LTC1923EUH shrinks the cooling-driver section to a 25 mm² footprint, freeing PCB area for the spectrometer's optical bench. Its -40 °C to +85 °C operating range accommodates laboratory and field-portable Raman instruments.
Được đề xuất
5G Optical Component Thermal Regulation
For 5G fronthaul and backhaul optical modules the LTC1923EUH stabilizes the laser and modulator temperatures across -40 °C to +85 °C ambient. Its 225 kHz PWM avoids interference with the module's high-speed serializer/deserializer, while the integrated H-bridge replaces a discrete MOSFET-plus-gate-driver circuit. The exposed-pad QFN-32 footprint is compatible with the 5x5 mm land pattern common in QSFP28 and QSFP-DD modules. The LTC1923EUH's 2 mA quiescent current keeps it well within the module's <1 W control-section power budget.
Được đề xuất
Fiber-Optic Gyroscope Temperature Control
In a fiber-optic gyroscope (FOG) the LTC1923EUH stabilizes the integrated-optics modulator and source temperature to suppress bias drift. The 225 kHz PWM frequency stays well below the FOG's modulation frequency (typically 10-100 kHz), avoiding aliasing of switching noise into the bias error. The integrated H-bridge delivers bidirectional current to a small Peltier cooler mounted under the optical chip, while the exposed pad dissipates gate-driver heat into the FOG's chassis ground. Compared with linear TEC drivers, the LTC1923EUH achieves 90 percent efficiency at full load, simplifying the FOG's thermal design.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC1923EUH — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC1923EUH#PBF | LTC1923EGN | LTC1923CUH | LTC1923IUH | MAX1978ETE+T |
|---|---|---|---|---|---|---|
| Package | QFN-32 (5x5) UH | QFN-32 (5x5) UH - same | QFN-32 (5x5) - same (per Site MPN list) | QFN-32 (5x5) UH - same | QFN-32 (5x5) UH - same | TQFN-32 (5x5) - same footprint family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices (formerly Maxim Integrated) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 3.0 V to 5.5 V |
| Switching Frequency | 225 kHz | 225 kHz | 225 kHz | 225 kHz | 225 kHz | 500 kHz |
| Bidirectional H-Bridge | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
| Temperature Grade | -40 °C to +85 °C (industrial) | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Supply Current (typ) | 2 mA | 2 mA | 2 mA | 2 mA | 2 mA | 2.5 mA |
| RoHS / Lead-Free | Non-PBF (standard); PBF variant available | Yes (PBF) | Non-PBF | Non-PBF | Non-PBF | Yes |
Bảo phân biệt quan trọng
- Integrated full H-bridge with bidirectional TEC drive (vsMAX1978ETE+T)
- Wide 2.7 V to 5.5 V supply range (vsMAX1978ETE+T)
- 225 kHz switching for compact magnetics (vsMAX1978ETE+T)
- Exposed-pad QFN-32 thermal performance (vsLTC1923EGN)
Ghi chú thiết kế
The LTC1923EUH's exposed pad (EP) on the bottom of the QFN-32 package is the primary path for gate-driver and bias current dissipation. Solder the EP directly to a ground copper pour of at least 1 square inch (645 mm²) on the top layer, with thermal vias (0.3 mm drill, 1 mm pitch) connecting to internal ground planes. At 2 mA quiescent supply current the IC's self-heating is minor (<50 mW), but the gate drivers can deliver several amps of bridge current, so robust thermal management is essential for sustained switching operation. Estimated: continuous 4 A TEC current at 5 V produces ~1 W in the gate drivers; without adequate copper the EP-to-ambient resistance (θJA) can rise above 50 °C/W.
Place the VCC decoupling capacitor (1 µF X7R ceramic, 10 V or higher) within 5 mm of the VCC pin. Place the gate-driver bypass capacitor and the bootstrap capacitor (per the datasheet typical application circuit) as close as possible to the IC. Route the TEC current loop (PWM outputs to inductor to TEC to current-sense resistor back to ground) tightly to minimize parasitic inductance that can inject ringing into the gate-drive signals. The exposed pad should not be used as the only ground connection - place a dedicated GND via adjacent to the EP for low-impedance return.
Do not operate the LTC1923EUH above 5.5 V on VCC; the absolute maximum is 6 V. The thermistor/RTD feedback network must use Kelvin connections to the IC's sense pins to avoid ground-loop errors in the temperature set-point. The enable pin (if present in your variant) must be driven logic-high within 1 µs of VCC stable to avoid latch-up; consult the datasheet timing diagram. Avoid placing noise sources (switching DC-DC converters) within 10 mm of the TEC current-sense resistor - switching noise can couple into the sense amplifier and degrade temperature-loop stability.
The 225 kHz switching frequency generates harmonics up to several hundred MHz. To minimize EMI, use a small ferrite bead on the VCC supply rail close to the IC and route the high-di/dt switching loops on an inner PCB layer with adjacent ground return. The QFN-32 package's small 5x5 mm footprint naturally minimizes loop area, but the TEC current loop should still be analyzed for radiated emissions if the system must meet EN 55022 or FCC Part 15 Class B limits.
Thông tin tuân thủ
RoHS compliance achieved via the #PBF suffix variant (LTC1923EUH#PBF). Not AEC-Q100 qualified - this is a commercial/industrial PMIC, not an automotive grade part. Standard LTC1923EUH (non-PBF) is the legacy SnPb finish; the PBF variant is the RoHS-compliant drop-in equivalent.
