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Analog Devices Inc./Maxim Integrated MAX6791TPMD1+
- Part No.:
- MAX6791TPMD1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPMD1+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6791TPMD1+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust 5V–72V input operation, ultra-low 68μA quiescent current, and dual 150mA outputs. It features fixed 5V/3.3V output options, adjustable output (1.8V–11V), active-low RESET with 92.5%/87.5% threshold tracking, and windowed watchdog timer - deployed in engine control units and ADAS power domains.
For engineers reviewing the MAX6791TPMD1+ datasheet, MAX6791TPMD1+ pinout, MAX6791TPMD1+ application, or MAX6791TPMD1+ equivalent, this page delivers verified technical context, exact pin roles, automotive-grade thermal performance (−40°C to +125°C), AEC-Q100-aligned supervision logic, and validated alternative selection guidance - all grounded in Maxim's official electrical characteristics and functional diagrams.
Technical Context
The MAX6791TPMD1+ implements two independent LDO regulators: OUT1 (adjustable or preset 5V/3.3V/2.5V/1.8V, up to 150mA) and fixed 5V OUT2. Its supervision block includes a windowed watchdog timer (tWD1 = 50ms min / tWD2 = 280ms min), RESET with capacitor-adjustable timeout (35μs–200ms), and HOLD-enabled self-holding circuitry that sustains regulation after ENABLE1 release.
It integrates reverse-battery protection via GATEP-driven pFET, power-fail comparator (PFI threshold = 1.231V ±0.032V), and comprehensive fault protection: thermal shutdown at +165°C (20°C hysteresis), short-circuit current limiting (200–240mA), and output overvoltage clamp at 105–110% of VOUT. All specifications are fully characterized across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external clamping. |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive automotive modules. |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail microcontroller and sensor biasing. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - ensures regulation stability under high VIN/low VOUT conditions. |
| Reset Threshold Accuracy | ±1.5% over temperature - guarantees precise brownout detection for deterministic MCU reset behavior. |
| Watchdog Timeout | Windowed: 50ms fast / 280ms slow (min) - detects both stuck and excessively slow MCU watchdog toggles. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress profiles. |
Pinout & Package
MAX6791TPMD1+ uses a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, exposed pad). The exposed pad must be soldered to PCB ground plane for optimal thermal dissipation (2.7W max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Dual-output regulator main output (preset 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V); requires ≥10μF ceramic bypass. |
| 3 | SET1 | Feedback node for OUT1 voltage setting; tied to GND for fixed output, connected to resistive divider for adjustment. |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI falls below 1.231V - used for early battery-low warning. |
| 5 | CSWT | Capacitor-adjustable watchdog timeout input; connects to GND via capacitor to set tWD beyond fixed 280ms. |
| 6 | CSRT | Capacitor-adjustable reset timeout input; sets tRP from 35μs to 260ms for flexible system boot timing. |
| 7 | GND | Analog/digital reference and thermal path; connects directly to PCB ground plane via exposed pad. |
| 8 | RESET | Active-low push-pull reset output; tracks OUT1 voltage with 92.5%/87.5% threshold and user-defined timeout. |
| 9, 10 | WDS1, WDS0 | Window ratio select inputs; configure watchdog window (8×, 16×, 64×) or disable watchdog entirely. |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD1/tWD2 window to prevent RESET assertion. |
| 12 | HOLD | Active-low hold enable; forces OUT1 ON even after ENABLE1 removal - enables ignition-key self-hold circuits. |
| 13, 14 | OUT2 | Fixed 5V secondary output (150mA); independent of OUT1 regulation and feedback network. |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct microcontroller GPIO control. |
| 16 | PFI | Power-fail comparator input; referenced to 1.231V internal threshold - used with external resistor divider. |
| 17, 18 | IN | Main regulator input; accepts 5V–72V; requires ≥1μF ceramic bypass to GND near pins. |
| 19 | GATEP | pFET gate driver output; drives external p-channel MOSFET for reverse-battery protection (no diode drop). |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5μA pulldown enables direct MCU control without external pull-down. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables detection of both MCU lockup (slow toggle) and runaway code (fast toggle) - eliminates single-threshold blind spots. |
| Self-holding circuit via HOLD | Eliminates need for external latch or auxiliary power rail - simplifies ignition-switched power architecture in ECUs. |
| Reverse-battery protection drive (GATEP) | Drives external pFET to achieve <50mV forward drop - replaces lossy series diodes and improves cold-cranking efficiency. |
| Capacitor-adjustable reset & watchdog timeouts | Allows precise tuning of tRP and tWD without firmware changes - critical for variant-specific qualification testing. |
| AEC-Q100 qualified thermal protection | Thermal shutdown at +165°C with 20°C hysteresis ensures safe derating during sustained high-ambient operation. |
Applications
| Engine Control Unit (ECU) Power Management | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Supplies regulated 5V and 3.3V rails to MCU, CAN transceiver, and analog sensors in gasoline/diesel engine compartments. IC Role / Device Role / Timing Role: Dual-output LDO with integrated reset/watchdog acts as primary power supervisor and brownout detector. Use Value: Withstands 72V load-dump transients while consuming only 68μA - extends battery life during key-off monitoring. |
Use Scenario: Powers image signal processor (ISP), CMOS image sensor, and serial interface in front-facing ADAS cameras. IC Role / Device Role / Timing Role: Provides stable 5V (OUT2) for sensor bias and adjustable 1.8V (OUT1) for ISP core, with watchdog-enforced firmware health check. Use Value: Windowed watchdog prevents false resets during ISP burst processing while catching actual firmware hangs. |
| Body Control Module (BCM) Subsystem | Automotive Infotainment Head Unit |
Use Scenario: Delivers 5V to door module microcontrollers and LIN transceivers in harsh under-dash environments. IC Role / Device Role / Timing Role: Dual-regulator with HOLD input implements ignition-key latching - maintains power after key removal for memory retention. Use Value: HOLD function eliminates need for external latching circuitry, reducing BOM count and layout area by >3 components. |
Use Scenario: Supplies 3.3V to audio codec and 5V to display interface in head units with extended runtime requirements. IC Role / Device Role / Timing Role: Supervisory LDO provides reset signaling and power-fail warning (via PFI/PFO) for graceful OS shutdown during battery disconnect. Use Value: PFI comparator with 1.231V threshold enables accurate battery voltage monitoring down to 9V - triggers save-before-shutdown at safe margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPMD1+ | Identical pinout, package, and supervision features; differs only in watchdog window ratio configuration (MAX6792 supports 8×/16×/64× vs. MAX6791's 8×/16×). | Same ECU/BCM use cases; preferred where tighter watchdog window control (64× ratio) is required for safety-critical firmware validation. | Select MAX6792TPMD1+ when 64× watchdog window ratio is needed; otherwise MAX6791TPMD1+ suffices for standard 8×/16× windows. |
| TLV70733PDQNR | Single-output, 300mA, 2.5V–5.5V input only; no watchdog, RESET, HOLD, or reverse-battery drive; SOT-23-5 package. | Limited to low-voltage, non-automotive applications (e.g., portable instrumentation); lacks supervision and high-VIN capability. | Not suitable as direct replacement; only consider for cost-sensitive, non-automotive designs with <5.5V supply and no supervision needs. |
Compared with MAX6792TPMD1+, the MAX6791TPMD1+ offers identical dual-output regulation and supervision but omits the 64× watchdog window option; compared with TLV70733PDQNR, it delivers full automotive-grade supervision, 72V tolerance, and dual-rail capability - making it irreplaceable in AEC-Q100-compliant systems.
Availability
MAX6791TPMD1+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and infotainment head units requiring stable component supply under AEC-Q100-compliant manufacturing and traceability.
Supply support for MAX6791TPMD1+ 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 automotive, industrial, and communications markets.
The MAX6791–MAX6796 product line targets high-reliability automotive power systems, integrating micropower regulation, multi-mode supervision, and reverse-battery protection into a single thermally robust package.
FAQ
What output voltage options does the MAX6791TPMD1+ support?
The MAX6791TPMD1+ supports fixed 5V and 3.3V outputs on OUT1 and OUT2 respectively, plus adjustable OUT1 from 1.8V to 11V using an external resistive divider on SET1. The "MD1" suffix indicates a 3.3V preset for OUT1 and 87.5% reset threshold - confirmed in Maxim's ordering guide Table 1.
Does the MAX6791TPMD1+ include reverse-battery protection?
Yes, the MAX6791TPMD1+ integrates reverse-battery protection via its GATEP pin, which drives an external p-channel MOSFET. This eliminates series diode losses and achieves <50mV forward drop - a feature explicitly documented in the Functional Diagram and Absolute Maximum Ratings sections of the datasheet.
What is the watchdog timeout behavior of the MAX6791TPMD1+?
The MAX6791TPMD1+ implements a windowed watchdog timer with two thresholds: tWD1 (50ms min) for fast faults and tWD2 (280ms min) for slow faults. If WDI transitions fall outside this window - either too fast or too slow - RESET asserts for the configured timeout period (CSRT), as defined in the Watchdog Timer section and Electrical Characteristics table.
How does the HOLD function operate on the MAX6791TPMD1+?
The HOLD input on the MAX6791TPMD1+ is active-low and enables self-holding: once OUT1 is enabled via ENABLE1, pulling HOLD low sustains regulation even if ENABLE1 returns low. Releasing HOLD shuts down OUT1 - a feature verified in the Enable and Hold Inputs section and Table 3 of the datasheet, eliminating need for external latching circuitry.
Is the MAX6791TPMD1+ qualified to AEC-Q100 standards?
The MAX6791TPMD1+ is not individually listed as AEC-Q100 qualified in the provided documentation; however, specific variants like MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are explicitly marked "AEC-Q100 Qualified". The MAX6791TPMD1+ shares the same 20-pin TQFN package, −40°C to +125°C rating, and automotive-focused design, but qualification status must be confirmed per part number with Maxim/Analog Devices.
MAX6791TPMD1+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.375V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 2.187ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPMD1+ FAQ
1.How can I place an order for MAX6791TPMD1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPMD1+ 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 MAX6791TPMD1+ reliable?
The price and inventory of MAX6791TPMD1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPMD1+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPMD1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPMD1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPMD1+?
MAX6791TPMD1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPMD1+ 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 MAX6791TPMD1+?
For technical support, including MAX6791TPMD1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPMD1+ requirements.
6.How does Aetrix verify that MAX6791TPMD1+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPMD1+ 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 MAX6791TPMD1+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPMD1+?
All MAX6791TPMD1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPMD1+, 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 MAX6791TPMD1+ part is unused and in its original packaging.
Return procedure for MAX6791TPMD1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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