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Analog Devices Inc./Maxim Integrated MAX8520ETP+T
- Part No.:
- MAX8520ETP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX8520ETP+T.pdf
- Description:
- IC DRVR PWR TEC 20-TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,924
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Product details
Overview
The MAX8520ETP+T from Maxim Integrated is a dual synchronous buck TEC (thermoelectric cooler) driver IC designed for precision temperature control in space-constrained optical modules. It delivers ±1.5A bidirectional output current, features on-chip power MOSFETs, supports adjustable switching frequency up to 1MHz via external resistor, and provides analog current control with 1% reference accuracy. It is used in SFF/SFP fiber-optic transceivers to stabilize laser diode temperature within ±0.01°C.
For engineers reviewing the MAX8520ETP+T datasheet, MAX8520ETP+T pinout, MAX8520ETP+T application, or MAX8520ETP+T equivalent, key selection criteria include bipolar current capability, ripple cancellation architecture, TEC voltage/current limiting accuracy, thermal shutdown behavior, and compatibility with compact 5mm × 5mm TQFN layouts in high-density optical assemblies.
Technical Context
The MAX8520ETP+T integrates two synchronized buck regulators operating in-phase to generate differential voltage across the TEC, enabling seamless bidirectional current flow without dead zones at low output. Its current-mode control loop uses CTLI input (centered at 1.50V) to set TEC current with 10V/V gain, while ITEC monitors output with ±10% accuracy over -40°C to +85°C.
It implements ripple cancellation by matching duty cycles of LX1/LX2 outputs, reducing differential TEC voltage ripple to <1mVpk-pk at 1A load. The device includes independent heating/cooling current limits (±150mV/RSENSE, 5% accurate), 2% accurate TEC voltage limit via MAXV, and thermal shutdown at +165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.5A continuous - enables full-range heating/cooling of typical 2Ω–4Ω TECs in SFP modules. |
| Reference Voltage | 1.500V ±1% - provides stable bias for thermistor networks and current-sense scaling. |
| Switching Frequency | Adjustable 500kHz–1MHz via REXT - allows optimization of inductor size vs. EMI in tight optical housings. |
| TEC Voltage Limit Accuracy | ±2% - ensures reliable protection against overvoltage stress on sensitive laser diode assemblies. |
| Heating/Cooling Current Limit | ±5% accuracy - prevents TEC current surges during setpoint transitions in closed-loop thermal control. |
| Thermal Shutdown Threshold | +165°C with 15°C hysteresis - protects die under sustained high-power operation in sealed modules. |
| Ripple Cancellation Effectiveness | Reduces differential TEC voltage ripple to <1mVpk-pk - avoids laser wavelength jitter induced by electrical noise. |
Pinout & Package
The MAX8520ETP+T is housed in a 20-pin, 5mm × 5mm × 0.9mm TQFN package with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 30°C/W and θJC = 2°C/W enable high-power operation when EP is soldered to a large PCB ground plane.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| LX1 / LX2 (Pins 1, 15) | Power switch node | Connects to external inductors; high-impedance in shutdown - enables safe TEC biasing during sleep mode. |
| PGND1 / PGND2 (Pins 2, 14) | Power ground return | Dedicated low-inductance paths for synchronous rectifier FETs - minimizes ground bounce in high-di/dt TEC current reversal. |
| CTLI (Pin 10) | Analog current command input | Voltage centered at 1.50V sets bidirectional TEC current; 10V/V gain yields ±1.5A full scale with 0.5V–2.5V range. |
| ITEC (Pin 5) | Current monitor output | Voltage output proportional to TEC current: VITEC = 1.5V + 8×(VOS1 − VCS) - enables real-time closed-loop feedback without external amplifiers. |
| MAXIP / MAXIN (Pins 7, 6) | Current limit threshold inputs | Set independent positive/negative current limits via resistor dividers from REF - prevents overshoot during fast thermal transients. |
| FREQ (Pin 13) | Frequency setting | Connect external resistor to GND to adjust switching frequency (60kΩ = 1MHz, 150kΩ = 500kHz) - balances efficiency vs. component size. |
| REF (Pin 9) | 1.50V reference output | Bypass with 0.1µF ceramic capacitor - supplies precise bias for thermistors, DACs, and current-sense resistors. |
Key Features
| Feature | Design Value |
|---|---|
| No dead zone at low current | Eliminates hunting near thermal setpoint by maintaining linear bidirectional control down to ±10mA - critical for sub-0.01°C stability in laser diodes. |
| Ripple cancellation scheme | Reduces differential TEC voltage ripple to <1mVpk-pk - prevents laser wavelength modulation and improves signal integrity in coherent optics. |
| On-chip nFET/pFET drivers | Integrates 0.14Ω/0.23Ω (5V) power switches - reduces BOM count by eliminating 4 external MOSFETs and gate drivers in TEC driver stage. |
| Accurate TEC voltage limit | 2% tolerance on maximum TEC voltage - safeguards laser diodes and TEC elements from overvoltage failure in unregulated supply environments. |
| Thermal shutdown with hysteresis | +165°C trip with +15°C hysteresis - ensures robust recovery after transient overload without oscillation or latch-up. |
Applications
| SFF/SFP Optical Transceivers | Fiber Laser Temperature Control |
|---|---|
|
Use Scenario: Stabilizing 1310nm/1550nm DFB laser diode temperature inside pluggable SFP+ modules under varying ambient conditions (-5°C to +70°C). IC Role / Device Role / Timing Role: Dual-buck TEC driver providing bidirectional ±1.5A current to maintain laser wavelength within ±0.1nm via analog CTLI loop. Use Value: Enables <0.01°C thermal stability using on-chip ripple cancellation and no-dead-zone control - directly improving bit-error-rate in 10G/25G Ethernet links. |
Use Scenario: Precision temperature regulation of pump laser diodes in erbium-doped fiber amplifiers (EDFAs) where thermal drift causes gain tilt. IC Role / Device Role / Timing Role: High-accuracy TEC controller with independent heating/cooling current limits and 1% reference - maintains constant diode junction temperature despite power cycling. Use Value: Achieves ±0.02°C long-term stability over 1000 hours using integrated voltage/current limiting and thermal fault protection - extending EDFA lifetime and reducing recalibration frequency. |
| Biotech Lab-on-Chip Systems | ATE Thermal Test Chambers |
|
Use Scenario: Rapid thermal cycling (−20°C ↔ +80°C) of microfluidic PCR cartridges with sub-second response time requirements. IC Role / Device Role / Timing Role: Fast-settling TEC driver with 10V/V CTLI gain and 200ns minimum pulse width - supports 5°C/s ramp rates without current overshoot. Use Value: Delivers ±1.5A peak current with 5% current-limit accuracy - eliminates TEC thermal shock and preserves cartridge integrity during aggressive thermal profiling. |
Use Scenario: Biasing TECs in automated test equipment chambers that require simultaneous heating/cooling of multiple DUTs under programmable profiles. IC Role / Device Role / Timing Role: Compact TEC driver with 5mm × 5mm footprint and 1.67W power dissipation rating - enables dense multi-channel thermal control boards. Use Value: Reduces board area by 40% vs. discrete MOSFET solutions while maintaining ±1.5A output - increases channel count per ATE rack unit without airflow compromise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TEC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8521ETP+T | Pin-selectable 500kHz/1MHz switching frequency; adds synchronization input (FREQ); same 20-pin TQFN package. | Preferred for systems requiring clock synchronization across multiple TEC drivers or tighter EMI control via frequency dithering. | Select MAX8521ETP+T when system-level timing coordination or reduced EMI via sync is required; MAX8520ETP+T remains optimal for fixed-frequency, cost-sensitive designs. |
| LM3478MM/NOPB | Single-channel boost/buck-boost controller; requires external MOSFETs, gate drivers, and current sensing; no integrated TEC-specific features. | Suitable only for custom TEC drivers where layout flexibility and thermal isolation outweigh BOM simplicity and precision. | Choose LM3478MM/NOPB only if full topology customization is needed; MAX8520ETP+T offers superior integration, accuracy, and optical-module qualification out-of-box. |
Compared with MAX8521ETP+T, the MAX8520ETP+T trades pin-selectable frequency for simpler resistor-based tuning and lower gate count, while versus LM3478MM/NOPB it delivers complete TEC-specific functionality-including ripple cancellation, dual-buck coordination, and analog current control-in a single chip with proven optical reliability.
Availability
The MAX8520ETP+T is available at Aetrix Electronics and suitable for SFF/SFP modules, fiber optic laser modules, and biotech lab equipment requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
Supply support for MAX8520ETP+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and optical applications.
The MAX8520/MAX8521 product line was engineered specifically for compact, high-precision TEC control in optical modules-emphasizing low-noise operation, zero-dead-zone current delivery, and integrated protection for laser diode reliability.
FAQ
What is the maximum TEC current supported by the MAX8520ETP+T?
The MAX8520ETP+T supports a continuous bidirectional TEC current of ±1.5A. This is specified over the full operating temperature range (-40°C to +85°C) and is enforced by internal current-limit circuitry tied to MAXIP and MAXIN pins. Peak current capability reaches ±2.25A for short durations, but sustained operation must remain within the ±1.5A limit to ensure thermal stability and longevity of both the MAX8520ETP+T and connected TEC.
How does the MAX8520ETP+T eliminate dead zones in TEC control?
The MAX8520ETP+T eliminates dead zones by using two synchronous buck regulators biased around VDD/2, enabling true differential voltage control across the TEC. Unlike H-bridge topologies that stall near zero current, this architecture maintains linear current control down to ±10mA. As a result, the MAX8520ETP+T avoids hunting behavior when the thermal setpoint is near ambient, ensuring stable laser diode temperature regulation even during fine-tuning phases in optical modules.
Can the MAX8520ETP+T be used with a 3.3V supply?
Yes, the MAX8520ETP+T operates from a single 3.0V to 5.5V supply. At 3.3V, its internal oscillator frequency drops ~7% versus 5V operation (e.g., 1MHz nominal becomes ~930kHz with REXT = 60kΩ), and nFET/pFET on-resistance increases slightly (0.16Ω/0.30Ω typical). All core functions-including ±1.5A output, 1.50V reference, and CTLI-based current control-remain fully functional and specified across the entire input range.
What is the purpose of the ITEC pin on the MAX8520ETP+T?
ITEC is an analog voltage output pin on the MAX8520ETP+T that provides a real-time monitor of TEC current: VITEC = 1.5V + 8×(VOS1 − VCS). It enables closed-loop thermal control without external op-amps or ADCs, delivering ±10% accuracy over temperature. Keeping capacitance on ITEC below 150pF is mandatory to preserve loop stability, as specified in the MAX8520ETP+T datasheet.
Does the MAX8520ETP+T include thermal protection?
Yes, the MAX8520ETP+T includes integrated thermal protection that shuts down the device when the junction temperature exceeds +165°C. It features 15°C hysteresis, so normal operation resumes only after the die cools to +150°C. This protection works independently of external circuitry and is active during all operating modes-including startup, regulation, and shutdown-ensuring robust reliability in sealed optical modules where airflow is limited.
MAX8520ETP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Thermoelectric Cooler
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX8520ETP+T FAQ
1.How can I place an order for MAX8520ETP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8520ETP+T 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 MAX8520ETP+T reliable?
The price and inventory of MAX8520ETP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8520ETP+T is usually 5 days.
3.What payment methods are accepted for MAX8520ETP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8520ETP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8520ETP+T?
MAX8520ETP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8520ETP+T 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 MAX8520ETP+T?
For technical support, including MAX8520ETP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8520ETP+T requirements.
6.How does Aetrix verify that MAX8520ETP+T is sourced from the original manufacturer or authorized distributors?
All MAX8520ETP+T 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 MAX8520ETP+T meets industry standards.
7.What is the process for return or replacement of MAX8520ETP+T?
All MAX8520ETP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8520ETP+T, 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 MAX8520ETP+T part is unused and in its original packaging.
Return procedure for MAX8520ETP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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