My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX8520ETP/GG8
- Part No.:
- MAX8520ETP/GG8
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- -
- Datasheet:
-
MAX8520ETP/GG8.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,934
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX8520ETP/GG8 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 5% accurate heating/cooling current limits - enabling sub-0.01°C thermal stability in SFP transceivers and fiber laser modules.
For engineers reviewing the MAX8520ETP/GG8 datasheet, MAX8520ETP/GG8 pinout, MAX8520ETP/GG8 application, or MAX8520ETP/GG8 equivalent, this page details its differential TEC drive architecture, ripple cancellation scheme, ±1.5A current-limit accuracy, 1.5V reference (1% tolerance), and 20-pin 5mm × 5mm TQFN package with exposed pad - all critical for low-noise, dead-zone-free optical module thermal management.
Technical Context
The MAX8520ETP/GG8 integrates two synchronized buck regulators operating in-phase with complementary duty cycles to generate differential voltage across the TEC, enabling true bidirectional current flow without dead zones at low output. Its current-mode control loop uses CTLI input (0.5V–2.5V) referenced to 1.5V to set TEC current with 10V/V gain and 1MΩ input resistance.
Ripple cancellation is achieved by matching common-mode ripple at OS1/OS2 while suppressing differential ripple via C5; the device also implements independent analog current limits (MAXIP/MAXIN) and a bipolar voltage limit (MAXV), all referenced to the internal 1.5V bandgap. Thermal shutdown activates 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 TECs in SFP modules without external FETs. |
| Reference Voltage | 1.500V ±1% - stable bias for thermistor networks and current-sense scaling; load-regulated to ±5mV over 10µA–1mA. |
| Switching Frequency | Adjustable 400kHz–1.2MHz via REXT - higher frequencies reduce inductor size (e.g., 4.7µH at 1MHz), lower frequencies improve efficiency at light loads. |
| Current Limit Accuracy | ±5% for heating/cooling limits - ensures reliable TEC protection against surge-induced mechanical stress in laser diode assemblies. |
| TEC Voltage Limit | 2% accurate - prevents overvoltage damage to sensitive TEC elements by clamping differential output to ≤VDD or 4×VMAXV. |
| ITEC Monitor Accuracy | ±10% - provides proportional voltage output (VITEC = 1.5V + 8×(VOS1−VCS)) for closed-loop thermal feedback without external amplification. |
| Supply Range | 3.0V to 5.5V - compatible with standard 3.3V and 5V system rails in optical networking equipment. |
Pinout & Package
MAX8520ETP/GG8 is housed in a 20-pin 5mm × 5mm TQFN package with exposed thermal pad (EP), optimized for high-power density and thermal dissipation in compact optical modules. The exposed pad must be soldered to a large PCB ground plane to maintain junction temperature below +150°C under full ±1.5A load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Power switch node outputs | Drive external inductors; high-impedance during shutdown; require low-ESR ceramic output capacitors (C2/C7) for ripple suppression. |
| PGND1, PGND2 | Power ground return paths | Separate low-impedance returns for each buck stage; must be star-connected to minimize ground bounce in high-di/dt TEC current paths. |
| SHDN | Active-low shutdown control | Pulling low disables PWM operation and forces LX outputs to high-impedance - essential for safe hot-plug insertion in SFP+ cages. |
| CTLI | Analog current command input | 0.5V–2.5V range centered at 1.5V; 10V/V gain sets bidirectional TEC current; 1MΩ input resistance minimizes DAC loading. |
| ITEC | Current monitor output | Voltage output proportional to TEC current (±1.5A → 0V–3.0V); bandwidth limited by <150pF capacitance requirement to preserve loop stability. |
| REF | 1.5V precision reference | Stable 1.500V ±1% source for biasing thermistors, setting current limits (MAXIP/MAXIN), and calibrating external ADCs. |
| FREQ | Frequency set input | Connect external resistor to GND (60kΩ for 1MHz, 150kΩ for 500kHz); not a digital logic input - voltage-controlled oscillator interface. |
| OS1, OS2, CS | Differential TEC voltage sensing | Enable ripple-cancellation topology; OS1/OS2 sense TEC terminals; CS references current-sense resistor (RSENSE) for bidirectional measurement. |
Key Features
| Feature | Design Value |
|---|---|
| No dead zone or hunting at low current | Eliminates thermal control instability near setpoint by maintaining linear bidirectional response down to ±10mA - critical for laser wavelength lock. |
| Ripple cancellation scheme | Reduces differential TEC ripple to <1mVp-p (vs. >10mV without cancellation), preventing laser diode mode hopping induced by electrical noise. |
| On-chip power MOSFETs | Integrates matched nFET/pFET pairs (RDS(ON) = 0.14Ω/0.23Ω @ 5V) - removes need for 4 external switches, saving 0.31in² board area in SFF modules. |
| Individually adjustable current limits | Separate MAXIP (heating) and MAXIN (cooling) pins allow asymmetric current limiting - protects TEC during transient thermal events without compromising steady-state performance. |
| 1% accurate voltage reference | 1.500V ±1% over -40°C to +85°C enables direct thermistor biasing and eliminates calibration drift in field-deployed optical transceivers. |
Applications
| SFP Transceiver Thermal Control | Fiber Laser Diode Stabilization |
|---|---|
Use Scenario: Maintaining precise case temperature of 1310nm/1550nm DFB lasers 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 counteract ambient drift and laser self-heating, with analog CTLI interface to external PID controller. Use Value: Enables <0.01°C thermal stability, meeting GR-468 reliability requirements and reducing wavelength drift to <±0.05nm over lifetime. |
Use Scenario: Stabilizing temperature of high-power 980nm pump lasers in EDFA amplifiers where thermal runaway causes catastrophic failure. IC Role / Device Role / Timing Role: High-efficiency TEC driver with 2% accurate VMAXV limit and thermal shutdown, interfacing to analog temperature sensor and DAC. Use Value: Prevents TEC overvoltage and junction overheating (>165°C), extending laser diode MTBF by >3× versus open-loop designs. |
| Biotech Optical Sensor Modules | ATE Laser Calibration Systems |
Use Scenario: Controlling temperature of interferometric biosensors in portable diagnostic devices requiring battery-powered, low-noise operation. IC Role / Device Role / Timing Role: Low-profile TEC driver with 500kHz/1MHz selectable frequency and <3mA no-load current, minimizing power consumption in handheld units. Use Value: Achieves 0.001°C thermal resolution with ripple-canceled output, enabling detection of sub-nanometer biomolecular binding events. |
Use Scenario: Rapid thermal cycling of laser diodes during production test to validate wavelength shift vs. temperature coefficients. IC Role / Device Role / Timing Role: Fast-settling TEC driver with 1ms CTLI step response and ±1.5A slew rate, synchronized to ATE timing sequencer via SHDN. Use Value: Reduces test time by 40% versus discrete solutions, supporting >100 units/hour throughput in automated calibration lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TEC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8521ETP+ | Pin-selectable 500kHz/1MHz switching frequency; adds FREQ sync input; identical 20-pin TQFN package and ±1.5A rating. | Preferred for systems requiring external clock synchronization or dynamic frequency switching during operation. | Select MAX8521ETP+ when clock alignment with system master clock or EMI spread-spectrum control is required. |
| LM3478MM/NOPB | Single-channel boost/buck controller; requires external MOSFETs, gate drivers, and current-sense circuitry; no integrated TEC-specific features. | Suitable only for custom high-current (>2A) or high-voltage (>12V) TEC designs where flexibility outweighs board area constraints. | Choose LM3478MM/NOPB only if MAX8520ETP/GG8's ±1.5A limit is insufficient and full design customization is acceptable. |
Compared with MAX8521ETP+, the MAX8520ETP/GG8 offers simpler frequency configuration (resistor-based) and lower BOM count, while LM3478MM/NOPB demands significant external components and lacks TEC-optimized functions like ripple cancellation and dual-buck coordination - making MAX8520ETP/GG8 the optimal choice for space-constrained optical modules requiring plug-and-play thermal control.
Availability
MAX8520ETP/GG8 is available at Aetrix Electronics and suitable for SFP transceivers, fiber laser modules, biotech optical sensors, and ATE calibration systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8520ETP/GG8 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 computing applications.
The MAX8520/MAX8521 product line was engineered specifically for compact optical modules requiring precise, low-noise TEC control - delivering the smallest footprint (0.31in²), highest integration (on-chip FETs, reference, monitors), and best thermal stability (<0.01°C) in its class.
FAQ
What is the maximum TEC current supported by the MAX8520ETP/GG8?
The MAX8520ETP/GG8 supports a continuous bidirectional TEC current of ±1.5A. This rating is guaranteed over the full operating temperature range (-40°C to +85°C) and supply voltage (3.0V to 5.5V). Peak current capability reaches ±2.25A per LX output, but sustained operation above ±1.5A risks thermal shutdown activation due to power dissipation limits in the 5mm × 5mm TQFN package.
How does the MAX8520ETP/GG8 eliminate dead zones in TEC control?
The MAX8520ETP/GG8 eliminates dead zones by using two synchronous buck regulators biased at 0.5×VDD at zero current, allowing seamless transition between heating and cooling modes. Its current-mode control loop maintains linearity down to ±10mA, ensuring no discontinuity or hunting near the thermal setpoint - a key advantage over H-bridge drivers that exhibit crossover distortion at low currents.
What is the function of the FREQ pin on the MAX8520ETP/GG8?
On the MAX8520ETP/GG8, the FREQ pin is an analog frequency-setting input that accepts an external resistor to ground (REXT) to adjust the internal oscillator frequency from 400kHz to 1.2MHz. A 60kΩ resistor sets 1MHz; 150kΩ sets 500kHz. Unlike the MAX8521, it does not accept digital logic levels - applying VDD or GND directly will not configure frequency and may cause undefined behavior.
Can the MAX8520ETP/GG8 drive a TEC without external current-sense resistors?
No - the MAX8520ETP/GG8 requires an external current-sense resistor (RSENSE) between the TEC and CS/OS1 pins to measure bidirectional current. The device uses this voltage drop (±150mV full-scale) to enforce current limits and generate the ITEC monitor output. Omitting RSENSE disables current limiting, monitoring, and closed-loop control, risking TEC and IC damage.
What thermal management is required for the MAX8520ETP/GG8 at full ±1.5A load?
At full ±1.5A load with 5V supply, the MAX8520ETP/GG8 dissipates ~1.67W. Its 20-pin TQFN package has θJA = 30°C/W; thus, a 50°C ambient requires a PCB with ≥2.5cm² copper pour under the exposed pad to keep junction temperature below +150°C. Thermal vias (≥6×0.3mm) to inner ground planes are mandatory - insufficient copper area triggers thermal shutdown within seconds.
MAX8520ETP/GG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8520ETP/GG8 FAQ
1.How can I place an order for MAX8520ETP/GG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8520ETP/GG8 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/GG8 reliable?
The price and inventory of MAX8520ETP/GG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8520ETP/GG8 is usually 5 days.
3.What payment methods are accepted for MAX8520ETP/GG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8520ETP/GG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8520ETP/GG8?
MAX8520ETP/GG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8520ETP/GG8 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/GG8?
For technical support, including MAX8520ETP/GG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8520ETP/GG8 requirements.
6.How does Aetrix verify that MAX8520ETP/GG8 is sourced from the original manufacturer or authorized distributors?
All MAX8520ETP/GG8 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/GG8 meets industry standards.
7.What is the process for return or replacement of MAX8520ETP/GG8?
All MAX8520ETP/GG8 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8520ETP/GG8, 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/GG8 part is unused and in its original packaging.
Return procedure for MAX8520ETP/GG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX8520ETP/GG8 Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
