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Analog Devices Inc./Maxim Integrated MAX6670AUB55
- Part No.:
- MAX6670AUB55
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB55.pdf
- Description:
- REMOTE TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,575
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Product details
Overview
The MAX6670AUB55 from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed at +55°C trip threshold, ±2.2°C max accuracy over -40°C to +125°C, and pin-selectable 4°C/8°C/12°C hysteresis - used for autonomous cooling control in PC power supplies and network switches.
For engineers reviewing the MAX6670AUB55 datasheet, MAX6670AUB55 pinout, MAX6670AUB55 application, or MAX6670AUB55 equivalent, this device delivers drop-in fan control with WARN/OT overtemperature alerts, FORCEON override, and µMAX-10 packaging optimized for space-constrained thermal management systems.
Technical Context
The MAX6670AUB55 integrates a precision remote diode temperature sensor, comparator with programmable hysteresis (via HYST pin), and open-drain FANOUT power MOSFET capable of sinking 250mA at ≤1V saturation. It operates exclusively from +3V to +3.6V, with internal POR circuitry activating at 1.0–2.0V VDD.
It features two dedicated open-drain alarm outputs: WARN activates when remote junction temperature exceeds the +55°C trip by +15°C, and OT activates at +30°C above trip. Both outputs support 6mA sink capability with <0.5V VOL, and exhibit <1µA high-state leakage at +5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Trip Threshold | +55°C factory-programmed; defines exact temperature at which FANOUT activates cooling fan |
| Temperature Accuracy | ±2.2°C max error over +40°C to +75°C remote junction range; ensures reliable thermal margin in automotive-grade operation |
| FANOUT Drive Capability | +12V/250mA open-drain sink; directly drives standard cooling fans without external transistor or gate driver |
| Supply Current | 110µA typical quiescent current; enables low-power thermal monitoring in always-on subsystems |
| Hysteresis Options | 4°C (HYST = GND), 8°C (HYST = float), or 12°C (HYST = VDD); prevents fan oscillation during marginal thermal conditions |
| WARN/OT Offset | +15°C (WARN) and +30°C (OT) above trip threshold; provides staged thermal warning and hard shutdown signaling |
| Operating Voltage | +3.0V to +3.6V only; incompatible with 5V logic rails or unregulated supplies - requires dedicated LDO |
Pinout & Package
MAX6670AUB55 is housed in a 10-pin µMAX package (3.0mm × 3.0mm, 0.5mm pitch), with exposed PGND pad for thermal dissipation and compact PCB footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PGND | Power ground return for FANOUT MOSFET; must be connected to low-impedance ground plane |
| 2 | FORCEON | Active-low fan override input; forces FANOUT on regardless of sensed temperature |
| 3 | DXP | Current-source positive terminal for remote P-N junction sensing; connects to anode of diode-connected transistor |
| 4 | DXN | Current-sink negative terminal; connects to cathode of remote diode and sets bias point |
| 5,7 | GND | Analog/digital reference ground; separate from PGND but must be low-impedance coupled |
| 6 | VDD | +3.0V to +3.6V supply input; requires local 1µF bypass capacitor |
| 8 | FANOUT | Open-drain power output; sinks up to 250mA to drive fan between PGND and +12V supply |
| 9 | HYST | Three-level hysteresis select: GND = 4°C, float = 8°C, VDD = 12°C |
| 10 | OT | Active-low overtemperature alarm; asserts when remote junction reaches +85°C (+55°C +30°C) |
| - | WARN | Active-low warning output; asserts at +70°C (+55°C +15°C); pin 2 in MAX6670 functional diagram |
Key Features
| Feature | Design Value |
|---|---|
| Integrated +12V/250mA fan driver | Eliminates need for external MOSFET, gate driver, and current-sense resistor in fan-control loop |
| Factory-trimmed +55°C trip threshold | Guarantees precise activation point without calibration or trimming components |
| Three-level hysteresis selection | Enables system-specific noise immunity tuning: 4°C for fast response, 12°C for aggressive thermal hold-off |
| Dual-stage thermal alarms (WARN/OT) | Supports hierarchical thermal management: early warning at +70°C, emergency shutdown at +85°C |
| Remote diode interface (DXP/DXN) | Directly interfaces with CPU on-die diodes or discrete 2N3904 transistors - no ADC or microcontroller required |
Applications
| PC Power Supply Thermal Management | Industrial Network Switch Cooling |
|---|---|
Use Scenario: Regulates airflow inside ATX power supplies where ambient and component temperatures rise under load. IC Role / Device Role / Timing Role: Remote-junction thermal switch triggering fan activation based on MOSFET heatsink temperature. Use Value: Prevents thermal runaway without firmware intervention; maintains PSU efficiency within safe operating limits across -40°C to +125°C. |
Use Scenario: Controls chassis fans in Layer 3 Ethernet switches deployed in uncontrolled telecom cabinets. IC Role / Device Role / Timing Role: Autonomous fan controller using onboard CPU diode as remote sensor; responds to ASIC junction temperature. Use Value: Delivers deterministic +55°C trip with ±2.2°C accuracy, ensuring fan starts before critical silicon throttling occurs. |
| Laboratory Instrument Overtemperature Protection | Automotive Infotainment Module Fan Control |
Use Scenario: Monitors power amplifier heatsinks in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Standalone thermal switch with WARN/OT outputs feeding FPGA interrupt and system reset logic. Use Value: Provides two independent thermal thresholds (+70°C warning, +85°C shutdown) with no software dependency. |
Use Scenario: Manages cooling for SoC and display driver ICs in head-unit modules operating in vehicle cabins. IC Role / Device Role / Timing Role: Automotive-grade thermal supervisor interfacing with discrete 2N3904 remote sensor near processor die. Use Value: Meets AEC-Q100 Grade 2 (-40°C to +105°C ambient) requirements with guaranteed +55°C trip and 125°C junction rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote-junction thermal switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6670AUB60 | +60°C factory trip threshold; identical pinout, hysteresis options, and WARN/OT offsets | Suitable where higher thermal margin is required before fan activation | Select when system thermal design targets fan start at +60°C instead of +55°C |
| MAX6670AUB50 | +50°C factory trip threshold; same package, supply, and alarm architecture | Better suited for low-power embedded systems requiring earlier fan intervention | Choose when thermal budget demands fan activation at lower junction temperatures |
Compared with MAX6670AUB60 and MAX6670AUB50, the MAX6670AUB55 offers a mid-range trip point ideal for balancing acoustic noise and thermal safety in mid-tier computing and industrial equipment - enabling consistent fan behavior without layout or firmware changes.
Availability
MAX6670AUB55 is available at Aetrix Electronics and suitable for PC power supplies, network switches, laboratory instruments, and automotive infotainment modules requiring stable component supply across extended temperature ranges.
Supply support for MAX6670AUB55 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 interface applications, with emphasis on reliability and integration.
The MAX6670AUB55 belongs to the MAX6668/MAX6670 family of remote thermal switches engineered for autonomous, software-free fan control in automotive, industrial, and computing environments.
FAQ
What is the factory-programmed temperature threshold for MAX6670AUB55?
The MAX6670AUB55 has a factory-programmed fan activation threshold of +55°C, measured at the remote P-N junction. This value is laser-trimmed during production and cannot be adjusted externally. The threshold remains stable across the full -40°C to +125°C operating range with ±2.2°C maximum error, making it suitable for automotive and industrial thermal management where calibration-free operation is essential. MAX6670AUB55 does not support user-programmable thresholds.
Does MAX6670AUB55 support 5V operation?
No, MAX6670AUB55 operates strictly from +3.0V to +3.6V and is not rated for 5V supply. Applying >+3.6V to VDD violates absolute maximum ratings and may cause permanent damage. A dedicated 3.3V LDO is required - direct connection to a 5V rail will exceed the +6V absolute max VDD-to-GND rating and compromise reliability. MAX6670AUB55's internal POR circuit also activates only within its specified 3V–3.6V window.
How does the HYST pin configure hysteresis on MAX6670AUB55?
On MAX6670AUB55, the HYST pin selects hysteresis via three logic states: connect to GND for 4°C, leave floating for 8°C, or connect to VDD for 12°C. This adjusts the temperature delta between fan turn-on and turn-off to prevent oscillation near the +55°C trip point. The setting directly affects thermal stability - e.g., 12°C hysteresis keeps the fan running until junction temperature drops to +43°C. MAX6670AUB55 does not support dynamic hysteresis adjustment during operation.
Can MAX6670AUB55 drive a 24V fan?
No, MAX6670AUB55's FANOUT pin is rated for a maximum of +15V absolute voltage and designed for +12V nominal fans. Driving a 24V fan exceeds the FANOUT-to-GND absolute maximum rating and risks catastrophic failure. The device's internal MOSFET is optimized for ≤12V loads with 250mA sink capability and ≤1V VOL at full current. For higher-voltage fans, an external driver stage is mandatory - MAX6670AUB55 itself cannot interface directly with 24V systems.
What is the function of the WARN and OT outputs on MAX6670AUB55?
WARN and OT are active-low, open-drain outputs on MAX6670AUB55 that provide staged thermal alerts: WARN asserts when the remote junction reaches +70°C (+55°C +15°C), and OT asserts at +85°C (+55°C +30°C). Both require external pull-up resistors and can interface directly with microcontroller GPIOs or FPGA interrupt inputs. They enable hierarchical thermal response - e.g., WARN triggers fan speed increase in systems with variable-speed control, while OT initiates system shutdown. MAX6670AUB55 does not support disabling either output.
MAX6670AUB55 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 55°C
- Accuracy:
- ±2.2°C
- Current - Output (Max):
- 250mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /FanOut, /OverTemp, /Warn
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 3 V ~ 3.6 V
- Current - Supply:
- 110µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-uMAX
MAX6670AUB55 FAQ
1.How can I place an order for MAX6670AUB55 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB55 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 MAX6670AUB55 reliable?
The price and inventory of MAX6670AUB55 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB55 is usually 5 days.
3.What payment methods are accepted for MAX6670AUB55?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB55 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB55?
MAX6670AUB55 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB55 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 MAX6670AUB55?
For technical support, including MAX6670AUB55 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB55 requirements.
6.How does Aetrix verify that MAX6670AUB55 is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB55 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 MAX6670AUB55 meets industry standards.
7.What is the process for return or replacement of MAX6670AUB55?
All MAX6670AUB55 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB55, 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 MAX6670AUB55 part is unused and in its original packaging.
Return procedure for MAX6670AUB55:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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