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Analog Devices Inc./Maxim Integrated MAX6665ASA65
- Part No.:
- MAX6665ASA65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX6665ASA65.pdf
- Description:
- FAN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:6,134
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Product details
Overview
MAX6665ASA65 from Maxim Integrated is a thermal fan controller with integrated 250mA low-side power switch, factory-programmed +65°C activation threshold, ±3°C max trip accuracy, pin-selectable hysteresis (1°C/4°C/8°C), and dual overtemperature outputs (WARN at +15°C, OT at +30°C above threshold). It drives cooling fans up to 24V/250mA in server power supplies and notebook thermal management.
For engineers reviewing the MAX6665ASA65 datasheet, MAX6665ASA65 pinout, MAX6665ASA65 application, or MAX6665ASA65 equivalent, key selection criteria include its fixed +65°C trip point, SO-EP package thermal performance, FANOUT low-side drive capability, WARN/OT open-drain signaling logic, and 65µA quiescent current for always-on thermal monitoring.
Technical Context
The MAX6665ASA65 implements a die-temperature-sensing comparator with factory-trimmed reference, directly controlling an on-chip N-channel MOSFET to switch fan current on the low side. Its hysteresis is set by HYST pin voltage level (floating = 1°C, GND = 4°C, VDD = 8°C), independent of external components.
WARN and OT outputs are active-low open-drain signals referenced to the same internal temperature sensor, with fixed +15°C and +30°C offsets above the FANOUT trip point, respectively, enabling staged thermal response without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Activation Threshold | +65°C factory-programmed; triggers FANOUT at exact die temperature, no calibration required. |
| Threshold Accuracy | ±3°C maximum error ensures reliable fan start within defined thermal margin. |
| FANOUT Drive Capability | 250mA continuous at VFANOUT < 0.6V enables direct control of common 5–12V PC cooling fans. |
| Supply Current | 65µA typical at +25°C allows integration into low-power always-on monitoring circuits. |
| Operating Voltage Range | +2.7V to +5.5V VDD supports 3.3V and 5V logic domains; fan supply independent (4.5V–24V). |
| WARN/OT Offset | +15°C (WARN) and +30°C (OT) above trip point provide deterministic two-stage thermal warning and shutdown. |
| Hysteresis Options | PIN-selectable 1°C/4°C/8°C prevents fan oscillation during marginal temperature conditions. |
Pinout & Package
MAX6665ASA65 is housed in an 8-pin SOIC with exposed paddle (SO-EP), optimized for thermal dissipation and PCB ground plane connection. The exposed paddle is internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Paddle) | Ground Reference | Common return for VDD, FANOUT, and internal circuitry; exposed paddle must be soldered to PCB ground plane for thermal and electrical integrity. |
| FORCEON (Pin 2) | Manual Fan Enable Input | Active-low override: pulling low forces FANOUT on regardless of temperature, enabling system-level fan control. |
| HYST (Pin 3) | Hysteresis Selection Input | Three-state logic: floating = 1°C, GND = 4°C, VDD = 8°C; sets thermal deadband to match system cooling dynamics. |
| FANON (Pin 4) | Fan Status Indicator | Push-pull output high when FANOUT is active; provides immediate feedback to host controller without pull-up. |
| OT (Pin 5) | Overtemperature Shutdown | Active-low open-drain signal asserted at +30°C above trip; used to trigger hardware reset or power-down sequencing. |
| WARN (Pin 6) | Overtemperature Warning | Active-low open-drain signal asserted at +15°C above trip; alerts system before critical thermal limit is reached. |
| VDD (Pin 7) | Logic Supply Input | +2.7V to +5.5V supply; requires local 1µF bypass capacitor to GND for noise immunity during fan switching. |
| FANOUT (Pin 8) | Fan Driver Output | N-channel MOSFET drain output; connects to fan cathode/low-side; handles up to 250mA with <0.6V saturation voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 250mA Fan Switch | Eliminates external MOSFET and gate driver, reducing BOM count and layout area in space-constrained thermal subsystems. |
| No External Components Required | Factory-trimmed threshold and hysteresis enable plug-and-play operation-no resistors, capacitors, or calibration needed. |
| Dual Independent Overtemperature Outputs | WARN and OT provide hardwired, latency-free escalation path from warning to shutdown without firmware involvement. |
| Low 65µA Supply Current | Enables permanent thermal monitoring in battery-backed or energy-harvesting systems where standby power is critical. |
| SO-EP Thermal Package | Exposed paddle improves thermal resistance (51°C/W) and stabilizes die temperature tracking for accurate threshold behavior. |
Applications
| Server Power Supplies | Notebook Thermal Management |
|---|---|
Use Scenario: Monitoring VRM and bulk capacitor temperature in 1U/2U server PSUs with forced-air cooling. IC Role / Device Role / Timing Role: Die-temperature-based fan controller driving 12V/200mA blower via low-side FANOUT switch. Use Value: Prevents thermal runaway during transient load spikes using +65°C trip and +30°C OT shutdown, eliminating need for microcontroller polling. | Use Scenario: Regulating CPU/GPU heatsink temperature in ultra-thin notebooks with limited airflow. IC Role / Device Role / Timing Role: Direct thermal sensor and fan actuator; FANON confirms fan status to EC, WARN signals thermal throttling initiation. Use Value: Enables silent operation below +65°C and rapid acoustic response above threshold, with 1°C hysteresis minimizing fan cycling noise. |
| Industrial PC Card Racks | Laboratory Instrument Cooling |
Use Scenario: Maintaining safe operating temperature across multiple PCIe expansion cards in ruggedized IPC chassis. IC Role / Device Role / Timing Role: Localized thermal guard for each card slot; OT output wired to backplane power sequencer for automatic deactivation. Use Value: Provides per-slot thermal protection without shared sensor bus, avoiding single-point failure in mission-critical deployments. | Use Scenario: Stabilizing laser diode driver temperature in benchtop optical analyzers requiring <±0.5°C thermal stability. IC Role / Device Role / Timing Role: High-accuracy thermal switch with ±3°C max error; WARN output triggers PID-controlled TEC pre-cooling before main fan activation. Use Value: Reduces thermal overshoot during warm-up cycles by decoupling warning and action thresholds, improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM57CISD-65/NOPB | Adjustable threshold via external resistor divider; ±2.5°C accuracy; no integrated fan driver - requires external MOSFET. | Supports custom trip points but increases component count and layout complexity; lacks WARN/OT outputs. | Select when programmable threshold is required and board space permits discrete driver design. |
| ADT7470ARQZ | I²C interface; dual PWM fan control; internal ADC; ±1°C accuracy; supports 3 fans; requires firmware integration. | Enables closed-loop speed control and telemetry but adds software dependency and interrupt overhead. | Select for multi-fan systems needing dynamic speed adjustment and thermal logging, not simple on/off control. |
Compared with LM57CISD-65/NOPB and ADT7470ARQZ, the MAX6665ASA65 delivers drop-in simplicity for fixed-threshold, single-fan applications-no configuration, no communication, no external power switch-making it optimal for cost-sensitive, firmware-light thermal safety systems.
Availability
MAX6665ASA65 is available at Aetrix Electronics and suitable for server power supplies, notebook thermal management, and industrial PC card racks requiring stable component supply, long-lifecycle support, and guaranteed factory-programmed +65°C trip behavior.
Supply support for MAX6665ASA65 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, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX6665ASA65 belongs to Maxim's thermal management product line, engineered for autonomous, hardware-based fan control in systems where reliability, low power, and zero-software thermal safety are mandatory.
FAQ
What is the factory-programmed temperature threshold for the MAX6665ASA65?
The MAX6665ASA65 has a fixed, non-adjustable fan activation threshold of +65°C, factory-trimmed and tested across the full -40°C to +125°C operating range. This value is laser-programmed during wafer sort and cannot be modified in the field. The MAX6665ASA65 datasheet specifies ±3°C maximum error at temperature extremes, ensuring predictable thermal response without calibration.
Can the MAX6665ASA65 drive a 24V fan directly?
Yes, the MAX6665ASA65 can drive fans rated up to 24V, but only on the low-side (FANOUT connected to fan cathode). The fan's positive terminal must be connected to its nominal supply (e.g., +24V), while FANOUT switches the return path. The MAX6665ASA65 itself operates from a separate +2.7V to +5.5V VDD supply and does not regulate or generate the fan voltage.
How does the HYST pin configure hysteresis on the MAX6665ASA65?
The HYST pin on the MAX6665ASA65 selects hysteresis via three states: left unconnected = 1°C, tied to GND = 4°C, tied to VDD = 8°C. This sets the temperature deadband between fan turn-on and turn-off to prevent oscillation. The actual effective hysteresis increases slightly due to self-heating (e.g., +7.65°C additional at 250mA), which must be accounted for in thermal design.
What is the function of the FANON pin on the MAX6665ASA65?
The FANON pin on the MAX6665ASA65 is a push-pull logic output that goes high whenever the FANOUT switch is active-whether triggered by die temperature exceeding +65°C or by forcing FORCEON low. It provides real-time, polarity-correct fan status to host controllers without requiring external pull-up resistors, simplifying interface design.
Are WARN and OT outputs on the MAX6665ASA65 active-high or active-low?
Both WARN and OT outputs on the MAX6665ASA65 are active-low, open-drain signals. WARN asserts (pulls low) when die temperature exceeds +15°C above the +65°C trip point (+80°C total), and OT asserts at +30°C above (+95°C total). Each requires an external pull-up resistor to VDD or another logic rail to generate a valid high-level signal.
MAX6665ASA65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 65°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- 250mA
- Output Type:
- Open Drain, Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- FanOn, /FanOut, /OverTemp, /Warn
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 65µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC-EP
MAX6665ASA65 FAQ
1.How can I place an order for MAX6665ASA65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6665ASA65 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 MAX6665ASA65 reliable?
The price and inventory of MAX6665ASA65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6665ASA65 is usually 5 days.
3.What payment methods are accepted for MAX6665ASA65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6665ASA65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6665ASA65?
MAX6665ASA65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6665ASA65 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 MAX6665ASA65?
For technical support, including MAX6665ASA65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6665ASA65 requirements.
6.How does Aetrix verify that MAX6665ASA65 is sourced from the original manufacturer or authorized distributors?
All MAX6665ASA65 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 MAX6665ASA65 meets industry standards.
7.What is the process for return or replacement of MAX6665ASA65?
All MAX6665ASA65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6665ASA65, 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 MAX6665ASA65 part is unused and in its original packaging.
Return procedure for MAX6665ASA65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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