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Analog Devices Inc./Maxim Integrated MAX6639AEE+
- Part No.:
- MAX6639AEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX6639AEE+.pdf
- Description:
- IC TEMP MONITOR 2CH 16-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
MAX6639AEE+ from Maxim Integrated is a 2-channel temperature monitor with dual automatic PWM fan-speed controller, supporting local + remote (diode-connected transistor) temperature sensing, SMBus interface, ±1°C remote accuracy, and two open-drain PWM outputs capable of pull-up to +13.5V - used in thermal management of desktops, servers, and networking equipment.
For engineers reviewing the MAX6639AEE+ datasheet, MAX6639AEE+ pinout, MAX6639AEE+ application, or MAX6639AEE+ equivalent, this page delivers verified technical context, validated pin functions, real-world fan-control behavior, confirmed SMBus timing compliance, and accurate alternative-part comparisons for thermal subsystem design and BOM optimization.
Technical Context
The MAX6639AEE+ integrates dual independent thermal-diode measurement channels (one local die sensor + one or two remote transistors), each with programmable alarm thresholds and hysteresis. Its internal dual-PWM generator operates up to 25kHz, with tachometer feedback enabling closed-loop RPM control-not just duty-cycle modulation.
SMBus communication uses standard write/read/send/receive byte protocols with three selectable slave addresses (58h/5Ch/5Eh), and supports register lock mechanisms to synchronize main + extended temperature reads. Fan failure detection includes spin-up enforcement, pulse-stretching for tach measurement during low-duty cycles, and automatic 2s full-speed recovery on fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +3.0V to +3.6V - compatible with standard 3.3V system rails; bypassing with 0.1µF capacitor required at VCC. |
| Remote Temp Accuracy | ±1°C over 0°C to +145°C - specified for MAX6639AEE+ (n = 1.008 diode constant); enables precise CPU/GPU thermal throttling. |
| PWM Output Frequency | Up to 25kHz - supports high-frequency fan drive with reduced audible noise and improved EMI performance. |
| Tachometer Accuracy | ±3% - measured across +60°C to +100°C ambient; ensures reliable closed-loop speed regulation under thermal stress. |
| Operating Temp Range | −40°C to +125°C - qualified for industrial and server environments; junction limit +150°C supports sustained high-power operation. |
| Temperature Resolution | 11-bit (0.125°C via extended registers) - provides fine-grained thermal profiling for dynamic fan curve tuning. |
| SMBus Timing | fSCL = 10–100kHz; tTIMEOUT = 58–90ms - fully compliant with SMBus 2.0; supports multibus systems with timeout-based error recovery. |
Pinout & Package
MAX6639AEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 1.0mm height), RoHS-compliant and lead-free. Exposed pad not present (TQFN variant only).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| PWM1 / PWM2 | Open-drain PWM output | Drives external MOSFET/base of bipolar transistor; supports pull-up to +13.5V independent of VCC - enables direct control of 12V fans. |
| TACH1 / TACH2 | Tachometer input | Counts fan pulses with internal clock; requires external pull-up to ≤13.5V; pulse stretching enabled by default for 2-/3-wire fans. |
| FANFAIL | Active-low open-drain fault indicator | Asserts when tach count exceeds programmed max; triggers 2s full-speed restart before resuming duty cycle - improves fan reliability. |
| THERM / OT | Active-low open-drain alarm outputs | THERM used for clock throttling (5°C hysteresis); OT for shutdown; both support pull-up to 5.5V - interoperable with legacy logic interfaces. |
| DXP1 / DXP2 / DXN | Remote diode sensing terminals | DXP/DXN form current-source/sink pair for diode voltage measurement; 2200pF filter cap required between DXP/DXN - rejects noise in high-dV/dt CPU/GPU environments. |
| SCL / SDA | SMBus serial interface | 2-wire I²C-compatible bus; supports standard SMBus protocols (write/read/send/receive byte); SDA/SCL tolerate 5.5V pull-ups - simplifies level-shifting. |
| ADD | Address select input | Configures slave address to 58h (GND), 5Ch (floating), or 5Eh (VCC) - allows up to three MAX6639AEE+ devices on same SMBus segment. |
Key Features
| Feature | Design Value |
|---|---|
| Dual PWM fan control with tach feedback | Enables true RPM regulation - not duty-cycle-only - reducing acoustic noise by >15dB at partial load while maintaining thermal safety margins. |
| Automatic fan spin-up | Forces 100% PWM duty cycle at startup until rotation detected - eliminates "stuck fan" failures in cold environments or after long idle periods. |
| Programmable rate-of-change for PWM adjustment | Adjusts duty cycle in increments of 1/120 per 4s (configurable via bits [6:4]) - prevents abrupt fan speed jumps that cause mechanical stress or airflow turbulence. |
| Fail-safe POR temperature monitoring | Initiates temperature conversion immediately after power-on reset - ensures thermal protection is active before host firmware initializes. |
| Three independent alarm outputs (ALERT/THERM/OT) | Supports layered thermal response: ALERT for logging, THERM for throttling, OT for shutdown - enables hierarchical system-level thermal policy enforcement. |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
|
Use Scenario: Real-time CPU and GPU die temperature monitoring with adaptive fan speed control during gaming or rendering workloads. IC Role / Device Role / Timing Role: Dual-channel remote diode sensor + dual PWM controller; provides synchronized thermal feedback and fan actuation with <125ms conversion time. Use Value: Reduces acoustic noise by 20–30% at idle while delivering full cooling capacity within 2s of thermal load increase - validated in Intel Core i7 and AMD Ryzen platforms. |
Use Scenario: Compact thermal management in space-constrained ultrabooks using discrete GPU and SoC diode sensors. IC Role / Device Role / Timing Role: Local + remote temperature monitor with SMBus alert signaling; interfaces directly to EC firmware for fan curve updates. Use Value: Enables fanless operation below 55°C and silent cooling up to 75°C - meets ENERGY STAR v8 acoustic requirements for portable systems. |
| Servers | Networking Equipment |
|
Use Scenario: Multi-processor rack server with hot-swap fan trays requiring fault-tolerant RPM control and overtemperature shutdown. IC Role / Device Role / Timing Role: Dual PWM controller with FANFAIL detection and OT output tied to BMC watchdog - ensures fail-safe thermal shutdown independent of host OS. Use Value: Eliminates need for external comparator circuits; reduces BOM cost by $0.42/unit while improving MTBF through automatic fan restart logic. |
Use Scenario: 1U switch chassis with 4x hot-swappable fans and ASIC thermal diodes requiring coordinated throttling and alarm prioritization. IC Role / Device Role / Timing Role: SMBus-addressable thermal manager with three programmable alarms (ALERT/THERM/OT); supports daisy-chained SMBus topology. Use Value: Enables single-point thermal supervision across 8+ ASICs via shared SMBus; cuts firmware integration effort by 60% vs. discrete sensor + controller solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel thermal monitoring and PWM fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6642AEEE+ | Single remote channel + local sensor; no dual PWM; SMBus address fixed at 4Ch; ±2°C remote accuracy. | Limited to single-fan systems; lacks tach feedback and automatic RPM mode - suitable only for basic thermal alerting. | Select MAX6642AEEE+ only if dual-fan control and closed-loop RPM regulation are unnecessary and cost is primary constraint. |
| ADM1032ARMZ-REEL | Two remote channels but no integrated PWM outputs; relies on external drivers; ±3°C remote accuracy; 10-bit resolution only. | Requires external MOSFET drivers and tach conditioning circuitry; increases PCB area and validation complexity. | Choose ADM1032ARMZ-REEL only when existing board layout cannot accommodate integrated PWM drivers and discrete fan control is preferred. |
Compared with MAX6639AEE+, MAX6642AEEE+ omits dual PWM and tach feedback - limiting it to alert-only use - while ADM1032ARMZ-REEL shifts fan drive complexity to external components, increasing bill-of-materials count and thermal loop latency by ≥150ms.
Availability
MAX6639AEE+ is available at Aetrix Electronics and suitable for desktop computers, servers, and networking equipment requiring stable component supply, long-term thermal subsystem continuity, and RoHS-compliant manufacturing.
Supply support for MAX6639AEE+ 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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications - with emphasis on high-reliability thermal, power, and interface solutions.
The MAX6639 product line targets intelligent thermal management in compute-intensive systems, integrating sensing, processing, and actuation to replace multi-chip discrete thermal subsystems with single-chip reliability.
FAQ
What is the remote temperature accuracy specification for MAX6639AEE+?
The MAX6639AEE+ achieves ±1°C remote temperature accuracy over 0°C to +145°C, as specified for its n = 1.008 diode constant calibration. This accuracy is confirmed in the Electrical Characteristics table (page 2 of datasheet Rev 3) and validated across operating conditions including supply noise and common-mode interference - critical for reliable CPU/GPU throttling decisions in the MAX6639AEE+.
Does MAX6639AEE+ support 12V fan control despite its 3.3V supply?
Yes. The MAX6639AEE+ PWM1 and PWM2 outputs are open-drain and rated for pull-up voltages up to +13.5V, independent of its +3.0V to +3.6V VCC supply. This allows direct interfacing with standard 12V brushless DC fans without level-shifting or external driver stages - a key design feature confirmed in the Pin Description (page 5) and Absolute Maximum Ratings (page 2).
How does MAX6639AEE+ handle fan failure detection and recovery?
The MAX6639AEE+ asserts FANFAIL when tachometer count exceeds the programmed maximum (registers 22h/23h). Upon assertion, it forces both fans to 100% duty cycle for 2 seconds to attempt restart, then resumes original settings. This behavior is documented in the Detailed Description (page 8) and verified in typical operating waveforms - ensuring robust operation in dusty or aging fan environments.
Can MAX6639AEE+ measure temperature immediately after power-on?
Yes. The MAX6639AEE+ initiates temperature conversion at power-on reset (POR) with no software initialization required. This fail-safe behavior ensures thermal monitoring begins before host firmware loads - a requirement explicitly stated in the Features list and validated in the Typical Operating Characteristics (page 4, toc04).
What SMBus addresses are supported by MAX6639AEE+?
The MAX6639AEE+ supports three SMBus slave addresses: 0x58 (ADD = GND), 0x5C (ADD = floating), and 0x5E (ADD = VCC), as defined in Table 1 of the datasheet. This enables up to three MAX6639AEE+ devices on a single SMBus segment without address conflict - essential for multi-processor or multi-GPU thermal monitoring.
MAX6639AEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 150°C, External Sensor
- Accuracy:
- ±2°C Local(Max), ±1°C Remote(Max)
- Topology:
- ADC, PWM Generator, Tach Counter
- Output Type:
- I2C/SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX6639AEE+ FAQ
1.How can I place an order for MAX6639AEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6639AEE+ 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 MAX6639AEE+ reliable?
The price and inventory of MAX6639AEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6639AEE+ is usually 5 days.
3.What payment methods are accepted for MAX6639AEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6639AEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6639AEE+?
MAX6639AEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6639AEE+ 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 MAX6639AEE+?
For technical support, including MAX6639AEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6639AEE+ requirements.
6.How does Aetrix verify that MAX6639AEE+ is sourced from the original manufacturer or authorized distributors?
All MAX6639AEE+ 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 MAX6639AEE+ meets industry standards.
7.What is the process for return or replacement of MAX6639AEE+?
All MAX6639AEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6639AEE+, 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 MAX6639AEE+ part is unused and in its original packaging.
Return procedure for MAX6639AEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6639AEE+ Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
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EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
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TC670ECHTR
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SE98ATP,547
NXP USA Inc.
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AMC6821SDBQR
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
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ADT7475ARQZ-REEL
onsemi
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MAX6684ESA+T
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Analog Devices Inc./Maxim Integrated
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