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Analog Devices Inc./Maxim Integrated MAX6670AUB60
- Part No.:
- MAX6670AUB60
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB60.pdf
- Description:
- REMOTE TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
MAX6670AUB60 from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed +60°C activation threshold, ±2.2°C max temperature accuracy over -40°C to +125°C, and dual open-drain overtemperature alarms (WARN at +75°C, OT at +90°C). It enables autonomous fan control in automotive-grade power supplies and industrial computing systems without software or calibration.
For engineers reviewing the MAX6670AUB60 datasheet, MAX6670AUB60 pinout, MAX6670AUB60 application, or MAX6670AUB60 equivalent, this page delivers verified thermal switching behavior, hysteresis configuration options, FANOUT drive capability, WARN/OT alarm timing relationships, and package-specific layout guidance for reliable remote diode sensing.
Technical Context
The MAX6670AUB60 implements a dedicated analog temperature comparator that monitors voltage drop across an external P-N junction (e.g., 2N3904) to infer die temperature. Its internal power MOSFET drives FANOUT directly, eliminating external driver circuitry.
It features three-level hysteresis selection (4°C/GND, 8°C/floating, 12°C/VDD), active-low WARN and OT outputs referenced to the +60°C trip point, and FORCEON override input enabling external fan activation independent of sensed temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Threshold | +60°C factory-programmed trip point; triggers FANOUT when remote junction exceeds this value. |
| Temperature Accuracy | ±2.2°C max error over full -40°C to +125°C operating range; ensures reliable thermal margining in automotive environments. |
| FANOUT Drive | +12V/250mA open-drain MOSFET output; directly powers standard cooling fans without external transistors or gate drivers. |
| WARN Output | Active-low open-drain signal asserted at +75°C (i.e., +15°C above +60°C threshold); provides early warning before critical overheating. |
| OT Output | Active-low open-drain signal asserted at +90°C (i.e., +30°C above +60°C threshold); serves as system-level thermal shutdown indicator. |
| Hysteresis Options | Selectable 4°C (HYST = GND), 8°C (HYST = floating), or 12°C (HYST = VDD); prevents fan oscillation during marginal temperature conditions. |
| Supply Range | +3.0V to +3.6V logic supply; compatible with 3.3V systems and immune to 5V rail noise due to separate VDD domain. |
Pinout & Package
MAX6670AUB60 is housed in a 10-pin µMAX package (3.0mm × 3.0mm, 0.5mm pitch), optimized for space-constrained PCB layouts near heat sources. PGND and GND are separated to isolate high-current fan return from signal ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Return path for FANOUT current; must be connected to low-impedance power ground plane to minimize voltage bounce during 250mA switching. |
| 2 FORCEON | Fan Override Input | Active-low logic input; pulling low forces FANOUT on regardless of remote temperature, enabling system-level fan control. |
| 3 DXP | Current Source Positive | Bias current source for remote diode anode; requires 2200pF capacitor to DXN for noise immunity in electrically noisy environments. |
| 4 DXN | Current Sink Negative | Reference node for remote diode cathode; internally biased to ~0.7V below DXP, forming precision diode voltage measurement loop. |
| 5 GND | Signal Ground | Analog and digital reference for internal comparators and logic; must be star-connected to avoid coupling fan-switching noise into sensing circuitry. |
| 6 VDD | Logic Supply | +3.0V to +3.6V input powering internal circuitry; requires local 1µF ceramic bypass capacitor placed within 2mm of pin. |
| 7 FANOUT | Fan Driver Output | Open-drain N-channel MOSFET capable of sinking 250mA at ≤1V saturation; connects directly to fan's low-side terminal. |
| 8 WARN | Warning Output | Active-low open-drain alarm triggered at +75°C; requires external pull-up to system voltage (e.g., +3.3V or +5V) for proper logic level translation. |
| 9 HYST | Hysteresis Control | Three-state logic input selecting 4°C (GND), 8°C (floating), or 12°C (VDD) hysteresis; determines temperature window between fan turn-on and turn-off. |
| 10 OT | Overtemperature Output | Active-low open-drain shutdown signal at +90°C; used to disable power stages or trigger system reset via microcontroller interrupt. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated +12V/250mA Fan Driver | Eliminates need for external MOSFET, gate driver, and current-sense resistor - reduces BOM count by ≥4 components and saves >12mm² PCB area. |
| Factory-Programmed +60°C Threshold | Guarantees precise thermal trip point without trimming resistors or firmware calibration; supports consistent thermal management across production batches. |
| Pin-Selectable Hysteresis (4°C/8°C/12°C) | Enables optimization for specific thermal mass and airflow profiles - e.g., 4°C for fast-response server fans, 12°C for slow-ramping industrial enclosures. |
| Dual Overtemperature Alarms (WARN/OT) | Provides staged thermal response: WARN alerts at +75°C for proactive cooling adjustment; OT asserts at +90°C to initiate fail-safe shutdown before silicon damage. |
| Remote Diode Sensing Interface | Directly interfaces with CPU-integrated diodes or discrete 2N3904 transistors; achieves ±2.2°C accuracy without ADC or lookup tables. |
Applications
| Automotive Power Supplies | Industrial Network Switches |
|---|---|
|
Use Scenario: Regulated 12V DC-DC converter in engine control unit (ECU) housing with ambient temperature swing from -40°C to +125°C. IC Role / Device Role / Timing Role: Thermal switch monitoring MOSFET junction temperature via remote diode; activates cooling fan only when heatsink exceeds +60°C. Use Value: Prevents thermal runaway during sustained high-load operation while minimizing fan runtime and acoustic noise in passenger compartments. |
Use Scenario: High-port-density Ethernet switch operating in unventilated telecom cabinets with localized hotspots near PHY ICs. IC Role / Device Role / Timing Role: Remote temperature monitor using onboard diode of Marvell 88E6352 switch IC; triggers WARN at +75°C to increase backplane fan speed before OT assertion. Use Value: Enables predictive thermal throttling instead of abrupt shutdown, maintaining packet forwarding continuity during transient overload events. |
| Laboratory Instrument Enclosures | Medical Imaging Power Modules |
|
Use Scenario: Benchtop oscilloscope with FPGA-based acquisition subsystem generating variable thermal load depending on sampling rate. IC Role / Device Role / Timing Role: Temperature supervisor measuring FPGA die temperature through dedicated sensing diode; uses HYST = floating for 8°C hysteresis to match enclosure thermal inertia. Use Value: Delivers stable fan operation without flutter during moderate temperature excursions, meeting IEC 61000-3-2 harmonic emission requirements for lab equipment. |
Use Scenario: X-ray generator power module requiring fail-safe thermal protection per IEC 62304 Class C software safety requirements. IC Role / Device Role / Timing Role: Dual-redundant thermal monitor where MAX6670AUB60 OT output drives hardware latch disabling HV inverter stage upon reaching +90°C. Use Value: Provides hardware-enforced thermal cutoff independent of microcontroller firmware, satisfying ASIL-B functional safety decomposition requirements. |
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 |
|---|---|---|---|
| MAX6668AUA60 | 8-pin µMAX, fixed 8°C hysteresis, no WARN/OT outputs, same +60°C threshold and +12V/250mA FANOUT. | Lacks staged overtemperature signaling; suitable only where single-fan control without warning hierarchy is acceptable. | Select MAX6668AUA60 if board space is constrained to 8-pin footprint and dual-alarm functionality is unnecessary. |
| LM57BISD-60/NOPB | Adjustable threshold (via external resistor), no integrated fan driver, requires external MOSFET, ±3°C accuracy, SOT-23-6 package. | Demands additional components for fan control; better suited for low-power applications (<100mA) or designs requiring field-programmable thresholds. | Choose LM57BISD-60/NOPB when threshold flexibility outweighs integration benefits and fan current demand is below 150mA. |
Compared with MAX6668AUA60, the MAX6670AUB60 adds WARN/OT alarms and hysteresis selectability at the cost of two extra pins; versus LM57BISD-60/NOPB, it delivers complete fan-driver integration and tighter accuracy but sacrifices threshold adjustability.
Availability
MAX6670AUB60 is available at Aetrix Electronics and suitable for automotive power supplies, industrial network switches, laboratory instruments, medical imaging modules, and telecom infrastructure requiring stable component supply across extended temperature ranges.
Supply support for MAX6670AUB60 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 demanding industrial, automotive, and communications applications.
The MAX6668/MAX6670 product line targets thermally managed electronic systems needing autonomous, calibration-free fan control with hardware-enforced safety margins - specifically addressing reliability gaps in legacy thermostatic or microcontroller-dependent cooling solutions.
FAQ
What is the exact factory-programmed temperature threshold for MAX6670AUB60?
The MAX6670AUB60 has a factory-programmed fan activation threshold of +60°C, meaning the FANOUT output turns on when the remote P-N junction temperature exceeds +60°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The WARN output activates at +75°C (+15°C above threshold), and the OT output at +90°C (+30°C above threshold). All specifications are guaranteed over the full -40°C to +125°C operating range.
Does MAX6670AUB60 require external components to operate as a standalone fan controller?
Yes, the MAX6670AUB60 requires a 2200pF capacitor between DXP and DXN for noise filtering, a 1µF ceramic bypass capacitor from VDD to GND placed within 2mm of the pin, and external pull-up resistors on WARN and OT outputs (typically 4.7kΩ to +3.3V or +5V). No external transistor, gate driver, or current-sense resistor is needed because the FANOUT driver integrates all necessary power switching elements.
How does hysteresis work on MAX6670AUB60, and what are the valid configuration options?
The MAX6670AUB60 offers three hysteresis settings via the HYST pin: 4°C when tied to GND, 8°C when left floating, and 12°C when connected to VDD. Hysteresis defines the temperature difference between fan turn-on (+60°C) and turn-off (+60°C minus selected hysteresis). For example, with HYST = VDD (12°C), the fan turns off at +48°C. This prevents rapid cycling near the trip point and matches thermal system response characteristics.
Can MAX6670AUB60 drive a 12V fan directly, and what is its maximum continuous current rating?
Yes, the MAX6670AUB60 can drive a +12V fan directly through its FANOUT pin, which is an open-drain N-channel MOSFET rated for 250mA continuous sink current at ≤1V saturation voltage. It supports fans with nominal supply up to +12V (absolute maximum 15V). The device includes thermal shutdown at +170°C with 20°C hysteresis to protect against sustained overload or blocked airflow conditions.
What types of remote temperature sensors are compatible with MAX6670AUB60?
The MAX6670AUB60 is compatible with discrete diode-connected transistors such as 2N3904, CMPT3904, SST3904, and KST3904-TF, as well as integrated temperature-sensing diodes found in CPUs and FPGAs. The sensor must exhibit forward voltage between 0.25V (at 10µA, highest temp) and 0.95V (at 100µA, lowest temp), with base resistance <100Ω. Large power transistors or devices with poor VBE consistency are not recommended.
MAX6670AUB60 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:
- 60°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
MAX6670AUB60 FAQ
1.How can I place an order for MAX6670AUB60 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB60 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 MAX6670AUB60 reliable?
The price and inventory of MAX6670AUB60 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB60 is usually 5 days.
3.What payment methods are accepted for MAX6670AUB60?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB60 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB60?
MAX6670AUB60 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB60 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 MAX6670AUB60?
For technical support, including MAX6670AUB60 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB60 requirements.
6.How does Aetrix verify that MAX6670AUB60 is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB60 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 MAX6670AUB60 meets industry standards.
7.What is the process for return or replacement of MAX6670AUB60?
All MAX6670AUB60 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB60, 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 MAX6670AUB60 part is unused and in its original packaging.
Return procedure for MAX6670AUB60:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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