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Analog Devices Inc./Maxim Integrated MAX6670AUB65
- Part No.:
- MAX6670AUB65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB65.pdf
- Description:
- REMOTE TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,340
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Product details
Overview
MAX6670AUB65 from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed trip threshold of +65°C, ±2.2°C max accuracy over -40°C to +125°C, and dual open-drain overtemperature alarms (WARN at +80°C, OT at +95°C). It operates from +3V to +3.6V and is used in automotive-grade PC power supplies and network switches for autonomous fan control.
For engineers reviewing the MAX6670AUB65 datasheet, MAX6670AUB65 pinout, MAX6670AUB65 application, or MAX6670AUB65 equivalent, this device delivers verified hysteresis selection (4°C/8°C/12°C), remote diode temperature sensing, integrated FANOUT switching, and automotive-qualified thermal alarm signaling without software or calibration.
Technical Context
The MAX6670AUB65 implements a BiCMOS-based remote-junction temperature sensor with current-source/sink excitation (DXP/DXN) and a comparator driving an internal N-channel power MOSFET on FANOUT. Its WARN and OT outputs are independent open-drain signals referenced to the same factory-set +65°C threshold.
Hysteresis is controlled via HYST pin logic level (GND = 4°C, float = 8°C, VDD = 12°C), and FORCEON provides external override capability. The device samples temperature at 3.3–4Hz and maintains 110µA typical supply current during standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | +65°C factory-programmed trip point for FANOUT activation |
| Threshold Accuracy | ±2.2°C max error across -40°C to +125°C ambient, enabling reliable thermal margining |
| FANOUT Drive Capability | +12V, 250mA sink current supports standard cooling fans without external drivers |
| WARN Output Trigger | Active-low at +80°C (i.e., +65°C +15°C), providing early thermal warning before critical shutdown |
| OT Output Trigger | Active-low at +95°C (i.e., +65°C +30°C), signaling mandatory system thermal shutdown |
| Hysteresis Options | Selectable 4°C (HYST=GND), 8°C (HYST=float), or 12°C (HYST=VDD) prevents fan oscillation near threshold |
| Supply Voltage Range | +3.0V to +3.6V - matches 3.3V rail systems and avoids LDO regulation overhead |
Pinout & Package
MAX6670AUB65 is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 0.8mm, 0.5mm pitch), optimized for space-constrained automotive and industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Return path for FANOUT MOSFET source; must be low-inductance connection to minimize switching noise |
| 2 FORCEON | Fan Control Input | Active-low override: drives FANOUT ON regardless of sensed temperature |
| 3 DXP | Current Source Positive | Drives 10µA current into anode of remote P-N junction (e.g., 2N3904 base-emitter) |
| 4 DXN | Current Sink Negative | Sinks current from cathode; internally biased to ~0.7V, requires 2200pF noise filter capacitor |
| 5,7 GND | Analog Ground | Reference for internal sensor circuitry; separate from PGND to reduce ground bounce coupling |
| 6 VDD | Supply Input | +3.0V to +3.6V analog/digital supply; requires local 1µF bypass capacitor |
| 8 FANOUT | Fan Driver Output | Open-drain N-MOSFET output rated for 250mA sink at ≤1.0V drop - directly drives fan between +12V and this pin |
| 9 HYST | Hysteresis Select | Three-level logic input: GND=4°C, float=8°C, VDD=12°C - sets thermal deadband to match system cooling dynamics |
| 10 OT | Overtemperature Output | Active-low open-drain signal asserted when remote junction reaches +95°C - triggers hardware shutdown |
| - WARN | Warning Output | Pin 2 on MAX6670 die (labeled as WARN in functional diagram); active-low at +80°C for pre-shutdown alert |
Key Features
| Feature | Design Value |
|---|---|
| +12V/250mA integrated fan driver | Eliminates need for external MOSFET, gate driver, and protection circuitry in fan-control subsystems |
| Factory-programmed +65°C threshold | Guarantees precise trip point without trimming resistors or firmware configuration |
| Pin-selectable hysteresis (4°C/8°C/12°C) | Enables tuning of thermal deadband to match enclosure airflow and fan response time |
| Dual overtemperature alarms (WARN/OT) | Provides layered thermal management: early warning (+15°C) and hard shutdown (+30°C) relative to fan trigger |
| 110µA typical supply current | Minimizes quiescent power draw in always-on thermal monitoring applications |
Applications
| PC Power Supplies | Automotive Infotainment Systems |
|---|---|
Use Scenario: Regulated +12V output stage in ATX-compliant PSUs where MOSFETs and rectifiers generate localized heat. IC Role / Device Role / Timing Role: Remote-junction thermal switch monitoring discrete diode near primary-side switching devices and activating cooling fan at +65°C. Use Value: Prevents thermal runaway without microcontroller intervention; WARN output alerts system controller 15°C before OT-triggered shutdown. |
Use Scenario: Under-dash head unit operating in high-ambient environments (e.g., parked vehicle in desert sun). IC Role / Device Role / Timing Role: Monitors CPU die temperature via on-chip diode and drives auxiliary fan using FANOUT, with OT forcing safe mode entry at +95°C. Use Value: Meets AEC-Q100 Grade 2 requirements (-40°C to +125°C), eliminating software-based thermal polling and reducing BOM count. |
| Industrial Network Switches | Laboratory Power Analyzers |
Use Scenario: 24-port PoE+ switch with dense ASIC layout generating >5W per port in enclosed chassis. IC Role / Device Role / Timing Role: Senses temperature at multiple hot spots using discrete 2N3904 transistors and independently controls zone-specific fans via FORCEON override. Use Value: Hysteresis selection (8°C default) prevents fan chatter during transient load changes; 4°C option enables tighter thermal control in forced-air-cooled designs. |
Use Scenario: High-precision benchtop power analyzer dissipating 15W in sealed metal enclosure with no active ventilation. IC Role / Device Role / Timing Role: Monitors heatsink temperature via remote diode and asserts WARN at +80°C to log thermal event, then OT at +95°C to disable output stage. Use Value: ±2.2°C max threshold error ensures repeatable calibration traceability; 10-pin µMAX footprint allows placement near thermal sources with minimal trace length. |
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 |
|---|---|---|---|
| MAX6670AUB70 | Factory-programmed +70°C threshold; identical pinout, hysteresis, and alarm offsets (+15°C/+30°C) | Used where higher thermal margin is acceptable before fan activation (e.g., low-power embedded gateways) | Select when system thermal design targets fan start at +70°C instead of +65°C - no layout or firmware changes required |
| LM57BISD-5.0/NOPB | Adjustable threshold via external resistor; single overtemperature output; no WARN signal; 6-pin WSON package | Requires external components for threshold setting and lacks dual-alarm staging | Choose for cost-sensitive designs needing basic thermal cutoff only - not suitable for staged warning/shutdown architectures |
Compared with MAX6670AUB70, the MAX6670AUB65 offers earlier fan activation and thermal warning at +65°C, improving system reliability under moderate load; compared with LM57BISD-5.0/NOPB, it delivers integrated dual-stage alarms and factory-trimmed accuracy without external components.
Availability
MAX6670AUB65 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial network switches, and laboratory power analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6670AUB65 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 demanding industrial, automotive, and computing applications.
The MAX6670AUB65 belongs to Maxim's remote temperature switch product line, engineered specifically for autonomous, software-free thermal management in fan-cooled systems with dual-stage overtemperature protection.
FAQ
What is the factory-programmed temperature threshold for MAX6670AUB65?
The MAX6670AUB65 has a factory-programmed fan activation threshold of +65°C. This value is laser-trimmed during production and cannot be adjusted externally. The WARN output activates at +80°C (+65°C +15°C), and the OT output activates at +95°C (+65°C +30°C). These thresholds are guaranteed across the full -40°C to +125°C operating range with ±2.2°C maximum error.
Does MAX6670AUB65 require external components for basic operation?
Yes, MAX6670AUB65 requires a 2200pF capacitor between DXP and DXN pins for noise filtering, a 1µF ceramic bypass capacitor from VDD to GND, and a remote P-N junction (e.g., 2N3904 transistor) connected to DXP/DXN. No resistors, trimmers, or microcontrollers are needed for core fan-control functionality - the device operates autonomously once powered and wired.
Can MAX6670AUB65 drive a 12V fan directly?
Yes, MAX6670AUB65 integrates a +12V-tolerant, 250mA-sink open-drain FANOUT MOSFET. Connect the fan between +12V and the FANOUT pin; the device pulls FANOUT low to activate the fan. Do not exceed +12V nominal (absolute max +15V) or 250mA continuous current. Thermal shutdown at +170°C protects the output stage under overload.
How is hysteresis configured on MAX6670AUB65?
Hysteresis on MAX6670AUB65 is set via the HYST pin: connect HYST to GND for 4°C hysteresis, leave it floating for 8°C, or tie it to VDD for 12°C. This adjusts the temperature deadband between fan turn-on and turn-off to prevent oscillation in systems with slow thermal response. The MAX6668 variant fixes hysteresis at 8°C and lacks the HYST pin.
Is MAX6670AUB65 qualified for automotive applications?
Yes, MAX6670AUB65 is specified for the automotive temperature range (-40°C to +125°C) and packaged in a 10-pin µMAX package with qualified reliability. While not AEC-Q200 certified as a standalone component, its electrical specifications, packaging, and production flow align with automotive-grade requirements for under-hood and infotainment thermal management subsystems.
MAX6670AUB65 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:
- 65°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
MAX6670AUB65 FAQ
1.How can I place an order for MAX6670AUB65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB65 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 MAX6670AUB65 reliable?
The price and inventory of MAX6670AUB65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB65 is usually 5 days.
3.What payment methods are accepted for MAX6670AUB65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB65?
MAX6670AUB65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB65 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 MAX6670AUB65?
For technical support, including MAX6670AUB65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB65 requirements.
6.How does Aetrix verify that MAX6670AUB65 is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB65 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 MAX6670AUB65 meets industry standards.
7.What is the process for return or replacement of MAX6670AUB65?
All MAX6670AUB65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB65, 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 MAX6670AUB65 part is unused and in its original packaging.
Return procedure for MAX6670AUB65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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