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Analog Devices Inc./Maxim Integrated MAX6651EEE+TG002
- Part No.:
- MAX6651EEE+TG002
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Motor Drivers, Controllers
- Package:
- -
- Datasheet:
-
MAX6651EEE+TG002.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Product details
Overview
MAX6651EEE+TG002 from Maxim Integrated is a SMBus/I2C-compatible fan-speed controller IC designed to regulate and monitor single 5V/12V brushless DC fans with tachometer feedback, while simultaneously monitoring up to four fan tachometer inputs for parallel-fan coordination. It features an 8-bit DAC (±5 LSB DNL), 3V–5.5V supply range, and open-drain GPIOs capable of sinking 10mA - deployed in RAID systems, telecom equipment, and server thermal management.
For engineers reviewing the MAX6651EEE+TG002 datasheet, MAX6651EEE+TG002 pinout, MAX6651EEE+TG002 application, or MAX6651EEE+TG002 equivalent, key selection considerations include its 16-pin QSOP package, four selectable SMBus slave addresses (36h/3Eh/90h/96h), closed-loop tachometer frequency matching capability, and hardware full-on override via GPIO1 - all critical for fail-safe thermal control in high-availability embedded platforms.
Technical Context
The MAX6651EEE+TG002 implements dual control loops: a digital-to-analog converter (DAC) sets a reference voltage for an internal feedback amplifier that drives an external N-channel MOSFET on the fan's low side; simultaneously, digital logic compares measured tachometer period against a target derived from the Fan-Speed Register, prescaler, and internal 254kHz ±10% oscillator. It supports both closed-loop (auto-regulation) and open-loop (µC-managed DAC control) modes.
Its GPIO architecture includes three configurable open-drain pins: GPIO0 as active-low alert output, GPIO1 as hardware full-on override input, and GPIO2 (MAX6651-exclusive) as internal clock output or external clock input for multi-device synchronization. Tachometer inputs accept 0–9V signals with 70–150kΩ input impedance and support 1kHz max input frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V - enables direct interface with 3.3V or 5V system rails without level-shifting |
| Fan Voltage Support | 5VDC or 12VDC - accommodates common PC/server cooling fan supplies |
| Tachometer Inputs | Up to four (TACH0–TACH3) - allows coordinated speed monitoring of parallel fans in redundant cooling arrays |
| DAC Resolution | 8 bits with ≤5 LSB differential nonlinearity - provides monotonic 256-step analog output for precise fan voltage control |
| SMBus Interface | 2-wire, 400kHz max clock - compatible with standard system management bus infrastructure |
| GPIO Sink Current | 10mA per pin - sufficient to drive LEDs or interface directly with logic-level inputs |
| Internal Oscillator | 254kHz ±10% - eliminates need for external timing components in closed-loop operation |
Pinout & Package
MAX6651EEE+TG002 is housed in a 16-pin QSOP (Quarter Size Outline Package) with 0.150" body width and 0.025" lead pitch, optimized for compact thermal management subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TACH0 | Primary tachometer input | Closes speed regulation loop; accepts open-collector tach signal (0–9V, 1kHz max) |
| TACH1–TACH3 | Additional tachometer inputs | Monitor up to three extra fans; used only for readback - no closed-loop control |
| OUT | Analog output driver | Drives gate/base of external N-MOSFET or bipolar transistor for low-side fan voltage regulation |
| FB | Feedback input | Connects to source/emitter node of external transistor to close analog control loop |
| GPIO0 | Configurable I/O | Default: active-low ALERT output signaling fault conditions (e.g., tach overflow, min/max output) |
| GPIO1 | Configurable I/O | Default: FULL ON hardware override input - forces fan to maximum speed independent of software |
| GPIO2 | Configurable I/O | MAX6651-only: internal clock output or external clock input for synchronizing multiple controllers |
| SDA/SCL | SMBus/I²C interface | Open-drain bidirectional data/clock lines compliant with SMBus timing specs (tLOW ≥1.3µs, tHIGH ≥0.6µs) |
| ADD | Slave address select | Pin-strapped to GND, VCC, or 10kΩ pull-down to set one of four SMBus addresses (36h/3Eh/90h/96h) |
| VCC/GND | Power supply | 3.0–5.5V operation; 10mA typical supply current at +25°C |
Key Features
| Feature | Design Value |
|---|---|
| Closed-loop tachometer regulation | Forces measured tach frequency to match programmed target via DAC-driven analog loop - eliminates software polling overhead |
| Four SMBus slave addresses | Enables up to four MAX6651EEE+TG002 devices on same bus without address conflict - essential for multi-zone thermal control |
| Hardware full-on override (GPIO1) | Guarantees fan runs at maximum speed during µC failure or firmware hang - meets safety-critical thermal shutdown requirements |
| Multi-fan tach monitoring | Reads TACH0–TACH3 counts independently - supports redundancy validation and load-balancing diagnostics in parallel-fan configurations |
| Programmable tach count time | Configurable 0.25s–1.0s integration window (via KCOUNT bits) - balances resolution (±2RPS min) and overflow margin at max fan speed |
Applications
| RAID Storage Arrays | Telecom Line Cards |
|---|---|
Use Scenario: Redundant cooling in high-density storage enclosures with hot-swap capability and strict acoustic noise limits. IC Role / Device Role / Timing Role: Fan-speed regulator and tachometer monitor coordinating up to four 12V fans per controller to maintain consistent airflow across disk bays. Use Value: Enables dynamic speed scaling based on ambient temperature and drive activity - reducing power by >30% and acoustic noise by 8–10dB(A) versus fixed-speed operation. |
Use Scenario: Thermal management of packet-processing ASICs and SERDES transceivers on carrier-grade line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: SMBus-accessible fan controller providing real-time tach feedback and hardware fail-safe full-on mode for uninterrupted operation during firmware updates. Use Value: Guarantees continuous cooling during software resets - preventing thermal throttling of 10G/25G interfaces and maintaining deterministic latency under burst traffic loads. |
| Enterprise Servers | Network Switching Racks |
Use Scenario: Multi-zone thermal control in 1U/2U rack servers with mixed 5V/12V fan fleets and BMC-based system management. IC Role / Device Role / Timing Role: Dual-role device acting as both closed-loop speed regulator (for primary CPU fans) and tach monitor (for auxiliary PSU and GPU fans). Use Value: Delivers granular per-zone fan control via standard IPMI-over-SMBus - enabling predictive fan health analytics and reducing mean time to repair (MTTR) by 40%. |
Use Scenario: High-availability cooling in modular L2/L3 switches where fan modules must operate synchronously across line-rate ports and fabric interfaces. IC Role / Device Role / Timing Role: Synchronized fan controller using GPIO2 clock output to align tach sampling windows across multiple MAX6651EEE+TG002 units on backplane. Use Value: Eliminates beat-frequency noise and airflow turbulence caused by unsynchronized fans - improving thermal uniformity and extending fan lifetime by 25%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fan-speed control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6650EUB+ | 10-pin µMAX package; single tachometer input (TACH0 only); no GPIO2 or TACH1–TACH3 | Designed for single-fan systems without multi-fan coordination or clock sync needs | Select when board space is constrained and only one fan requires closed-loop regulation |
| LM87CIMT/NOPB | Integrated temp sensor + fan controller; 3.3V-only supply; no hardware full-on override; different SMBus register map | Targeted at cost-sensitive desktop motherboards with integrated thermal sensing | Choose if local temperature measurement is required alongside fan control and 3.3V rail is guaranteed |
Compared with MAX6650EUB+, the MAX6651EEE+TG002 adds parallel-fan monitoring and synchronization capability at the cost of larger QSOP packaging; versus LM87CIMT/NOPB, it offers higher voltage flexibility (3–5.5V), robust hardware fail-safe, and dedicated tach processing - making it preferable for industrial and telecom thermal subsystems demanding reliability over integration density.
Availability
MAX6651EEE+TG002 is available at Aetrix Electronics and suitable for RAID storage arrays, telecom line cards, and enterprise servers requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MAX6651EEE+TG002 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 industrial, communications, and computing applications - emphasizing reliability, integration, and system-level performance.
The MAX6651EEE+TG002 belongs to Maxim's thermal management product line, engineered specifically for intelligent, SMBus-controlled fan regulation in high-availability systems where hardware-level fail-safe behavior and multi-device synchronization are mandatory design requirements.
FAQ
What is the function of GPIO2 on the MAX6651EEE+TG002?
GPIO2 on the MAX6651EEE+TG002 is a MAX6651-exclusive pin configurable as either an internal clock output (254kHz) or an external clock input to synchronize multiple MAX6651EEE+TG002 devices. This capability ensures aligned tachometer sampling and coordinated fan response across redundant cooling zones - a feature absent in the MAX6650 and critical for noise-sensitive telecom and server applications. The MAX6651EEE+TG002 uses GPIO2 to eliminate beat frequencies and airflow turbulence in multi-fan deployments.
Does the MAX6651EEE+TG002 support both 5V and 12V fans?
Yes, the MAX6651EEE+TG002 supports both 5VDC and 12VDC brushless fans via configuration bit '5/12V' in the Configuration-Byte Register (default = 12V). Its FB input tolerates up to 13.2V, and OUT driver is rated for linear regulation across the full fan supply range. The IC automatically adjusts tachometer threshold voltage (VTACH_ = VFB + 0.5V to VFB + 3V) based on selected fan voltage - ensuring reliable pulse detection regardless of supply rail. This dual-voltage support makes the MAX6651EEE+TG002 suitable for heterogeneous fan fleets in enterprise servers.
How does the MAX6651EEE+TG002 implement closed-loop fan speed control?
The MAX6651EEE+TG002 implements closed-loop fan speed control by comparing the measured tachometer period against a target derived from the Fan-Speed Register, internal 254kHz oscillator, and programmable prescaler. When tach frequency deviates, the IC adjusts its 8-bit DAC output to modulate the voltage across the external MOSFET, thereby changing fan voltage and speed. This fully autonomous regulation occurs without µC intervention - reducing software overhead and enabling deterministic response to thermal transients. The MAX6651EEE+TG002 achieves this using two tightly coupled control loops: digital (tach counting/timing) and analog (DAC + feedback amplifier).
What are the SMBus slave address options for the MAX6651EEE+TG002?
The MAX6651EEE+TG002 supports four SMBus slave addresses: 36h, 3Eh, 90h, and 96h - selected by strapping the ADD pin to GND, high-Z, 10kΩ to GND, or VCC respectively. This pin-strapping scheme allows up to four MAX6651EEE+TG002 devices on a single SMBus without address collision, enabling scalable thermal management in multi-blade servers or distributed telecom chassis. Each address maps to a unique 7-bit identifier compliant with SMBus v1.1 timing and arbitration rules - verified in the MAX6651EEE+TG002's Electrical Characteristics table under ADDRESS SELECT (ADD) parameters.
Can the MAX6651EEE+TG002 operate without an external microcontroller?
Yes, the MAX6651EEE+TG002 can operate autonomously in closed-loop mode after initial configuration: once the Fan-Speed Register and Configuration-Byte Register are set via SMBus, it continuously regulates fan speed based on tachometer feedback without µC involvement. Hardware features like GPIO1 full-on override and GPIO0 alert output further enable fail-operational behavior during µC lockup or firmware update. However, initial setup, alarm monitoring, and multi-fan coordination still require host processor interaction - the MAX6651EEE+TG002 is not a standalone "set-and-forget" controller but a highly autonomous peripheral with robust safety mechanisms.
MAX6651EEE+TG002 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- -
- Function:
- -
- Output Configuration:
- -
- Interface:
- -
- Technology:
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- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- -
- Voltage - Load:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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MAX6651EEE+TG002 FAQ
1.How can I place an order for MAX6651EEE+TG002 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6651EEE+TG002 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 MAX6651EEE+TG002 reliable?
The price and inventory of MAX6651EEE+TG002 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6651EEE+TG002 is usually 5 days.
3.What payment methods are accepted for MAX6651EEE+TG002?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6651EEE+TG002 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6651EEE+TG002?
MAX6651EEE+TG002 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6651EEE+TG002 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 MAX6651EEE+TG002?
For technical support, including MAX6651EEE+TG002 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6651EEE+TG002 requirements.
6.How does Aetrix verify that MAX6651EEE+TG002 is sourced from the original manufacturer or authorized distributors?
All MAX6651EEE+TG002 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 MAX6651EEE+TG002 meets industry standards.
7.What is the process for return or replacement of MAX6651EEE+TG002?
All MAX6651EEE+TG002 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6651EEE+TG002, 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 MAX6651EEE+TG002 part is unused and in its original packaging.
Return procedure for MAX6651EEE+TG002:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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