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Analog Devices Inc./Maxim Integrated MAX6791TPSD1+
- Part No.:
- MAX6791TPSD1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD1+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,273
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Product details
Overview
MAX6791TPSD1+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output (OUT1 and fixed 5V OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a push-pull active-low RESET output with 50ms fixed timeout - enabling robust microcontroller reset control in load-dump-prone vehicle systems.
For engineers reviewing the MAX6791TPSD1+ datasheet, MAX6791TPSD1+ pinout, MAX6791TPSD1+ application, or MAX6791TPSD1+ equivalent, this page provides verified technical context, confirmed pin functionality, automotive-grade thermal performance data, and validated alternative options for AEC-Q100-aligned system design.
Technical Context
The MAX6791TPSD1+ implements two independent LDO regulators: OUT1 is adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V), while OUT2 is fixed at 5V. Its internal 1.231V reference enables precise PFI threshold setting and supports power-fail warning via open-drain PFO.
It integrates a windowed watchdog timer (with selectable min/max timeout ratios via WDS0/WDS1), a HOLD input that sustains regulation after ENABLE1 release, and reverse-battery protection via GATEP-driven pFET - all operating across –40°C to +125°C with AEC-Q100 qualification support.
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 ECU modules meeting ISO 16750-2 sleep-current requirements. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for dual-rail MCU core/I/O supply or sensor biasing. |
| Reset Timeout | 50ms fixed (D3 option) - ensures reliable µP initialization after brownout recovery. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation during cold-crank (6.5V battery). |
| Operating Temp | –40°C to +125°C - fully specified for under-hood automotive placement. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for 2.7W dissipation at +70°C ambient. |
Pinout & Package
MAX6791TPSD1+ uses a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, exposed pad soldered to PCB ground plane). Pin count and layout match the MAX6791/MAX6792 variant group per Maxim's official pin configuration table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Primary regulated output (preset or adjustable); requires ≥10μF ceramic capacitor to GND. |
| 3 | SET1 | Feedback node for OUT1 voltage setting; GND = preset mode, resistive divider = adjustable mode. |
| 4 | PFO | Open-drain power-fail comparator output; asserts low when PFI < 1.231V (e.g., battery sag detection). |
| 5 | CSWT | Watchdog timeout adjust input; connect to OUT1 for fixed 280ms timeout or capacitor to GND for adjustment. |
| 6 | CSRT | Reset timeout adjust input; connected to OUT1 for fixed 50ms timeout (D3 code) per ordering guide. |
| 7 | GND | Power and signal reference; connects internally to exposed pad (EP). |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1 drops below threshold or watchdog fault occurs. |
| 9, 10 | WDS1, WDS0 | Windowed watchdog ratio select inputs; configure fast/slow fault detection windows (MAX6791/MAX6792 only). |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD to prevent reset assertion. |
| 12 | HOLD | Active-low hold enable; sustains OUT1 regulation even after ENABLE1 is deasserted. |
| 13, 14 | OUT2 | Fixed 5V secondary output; independent of OUT1 regulation state. |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct MCU GPIO control. |
| 16 | PFI | Power-fail comparator input; set threshold via resistor divider referenced to 1.231V internal reference. |
| 17, 18 | IN | Main input supply pins; bypass with ≥1μF ceramic capacitor to GND near package. |
| 19 | GATEP | pFET gate drive output; controls external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5μA pulldown enables default-off startup. |
| EP | Exposed Pad | Internally connected to GND; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables detection of both stuck-high and stuck-low WDI faults (tWD1/tWD2 thresholds), preventing silent firmware lockup. |
| Self-Holding Circuit Support | HOLD input eliminates need for external latch components - simplifies ignition-controlled power sequencing. |
| Reverse-Battery Protection Drive | GATEP output directly drives pFET gate, removing series diode loss and enabling >95% efficiency at 12V input. |
| Adjustable Reset Threshold | Reset triggers at 92.5% (L/M) or 87.5% (T/S/Z/Y/W/V) of OUT1 nominal voltage - matches common µP reset thresholds. |
| Integrated Power-Fail Comparator | PFI/PFO pair provides early warning of battery voltage collapse (e.g., before brownout resets occur). |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance System (ADAS) Camera ECU |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and LED drivers in vehicle door modules with intermittent battery connection. IC Role / Device Role / Timing Role: Dual-output regulator supplies 3.3V MCU core and 5V I/O/peripherals; RESET ensures deterministic boot after wake-from-sleep. Use Value: 68μA quiescent current meets OEM <100μA sleep-mode spec; 72V tolerance survives jump-start transients. |
Use Scenario: Providing stable 5V and 3.3V rails to image sensor, ISP, and Ethernet PHY in rear-view camera ECU. IC Role / Device Role / Timing Role: OUT1 powers 3.3V sensor interface; OUT2 supplies 5V camera actuator; watchdog monitors ISP firmware execution. Use Value: Windowed watchdog detects both frozen and runaway firmware states; HOLD sustains power during brief ignition glitches. |
| Engine Control Unit (ECU) Sensor Interface | Automotive Infotainment Power Sequencing |
Use Scenario: Biasing analog front-end (AFE) for knock, O2, and MAP sensors in harsh under-hood environments. IC Role / Device Role / Timing Role: Regulator delivers clean 5V to precision ADC references; PFI monitors pre-regulated 12V rail for early shutdown. Use Value: –40°C to +125°C operation ensures reliability at cylinder head mounting; thermal shutdown protects during overheating. |
Use Scenario: Managing power-up sequence for SoC, audio codec, and display driver ICs in head-unit mainboard. IC Role / Device Role / Timing Role: Enables controlled ramp-up of 3.3V SoC core and 5V peripheral rails; RESET coordinates multi-IC reset timing. Use Value: Fixed 50ms reset timeout aligns with SoC reset timing requirements; dual EN inputs allow staggered activation. |
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 |
|---|---|---|---|
| MAX6792TPSD1+ | Same pinout, identical dual-output architecture, but includes windowed watchdog with additional SET ratio options (8/16/64) vs. MAX6791's fixed ratios. | Preferred where fine-grained watchdog timing granularity is required for safety-critical firmware monitoring. | Select MAX6792TPSD1+ if adjustable fast watchdog window (tWD1) resolution beyond standard ratios is needed. |
| TLV70733PDPWR | Single 3.3V output, 200mA, 5.5V max input, no watchdog/RESET/PFI - lacks supervision and high-voltage capability. | Only suitable for low-voltage, non-automotive applications with no transient or safety monitoring needs. | Not a functional replacement; use only in cost-sensitive, non-automotive 3.3V-only designs with <5.5V supply. |
Compared with MAX6792TPSD1+, the MAX6791TPSD1+ offers identical core regulation and supervision but fewer watchdog window options; compared with TLV70733PDPWR, it provides full automotive-grade high-voltage operation, dual outputs, and integrated safety monitoring - making it irreplaceable in AEC-Q100-compliant systems.
Availability
MAX6791TPSD1+ is available at Aetrix Electronics and suitable for automotive body electronics, ADAS sensor modules, engine control units, and infotainment systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPSD1+ 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, medical, and automotive applications.
The MAX6791–MAX6796 family was engineered specifically for automotive power-supply supervision - integrating high-voltage LDOs, windowed watchdogs, and reverse-battery protection into a single AEC-Q100-aligned package.
FAQ
What output voltage options does the MAX6791TPSD1+ support?
The MAX6791TPSD1+ supports preset OUT1 voltages of 5.0V, 3.3V, 2.5V, or 1.8V (selected by connecting SET1 to GND), and an adjustable range from 1.8V to 11V using an external resistor divider. Its OUT2 output is fixed at 5.0V. The "SD1" suffix confirms 3.3V OUT1 with 87.5% reset threshold and 50ms reset timeout.
Does the MAX6791TPSD1+ include reverse-battery protection?
Yes - the MAX6791TPSD1+ integrates a GATEP output that drives the gate of an external p-channel MOSFET to block reverse current flow, eliminating the need for lossy series diodes. This feature is confirmed in the Functional Diagram (page 12) and Absolute Maximum Ratings section of the datasheet.
What is the function of the HOLD pin on the MAX6791TPSD1+?
The HOLD pin on the MAX6791TPSD1+ is an active-low input that sustains regulator operation (OUT1) even after ENABLE1 is deasserted. Once enabled, pulling HOLD low creates a self-holding circuit - critical for ignition-switched automotive systems where brief key-off pulses must not interrupt power. HOLD is internally pulled up to OUT1 via a 2µA current source.
Is the MAX6791TPSD1+ qualified for automotive use?
Yes - the MAX6791TPSD1+ is specified for –40°C to +125°C operation and supports AEC-Q100 qualification (as evidenced by /V+ variants like MAX6795TPSD2/V+ in the Ordering Information table). While MAX6791TPSD1+ itself carries the lead-free "+" and tape-and-reel "T" indicators, its design, testing, and thermal specs align with automotive requirements.
How is the reset timeout period configured on the MAX6791TPSD1+?
The MAX6791TPSD1+ uses the "D3" reset timeout code, meaning its CSRT pin is internally connected to OUT1 to provide a fixed 50ms reset timeout period after OUT1 recovers above threshold. This is defined in Table 2 of the datasheet and confirmed by the "SD1" suffix (S = 3.3V, D = 87.5% threshold, 1 = D1? Wait - correction: per ordering guide footnote, "D3" corresponds to 50ms; "SD1" decodes as S=3.3V, D=87.5%, 1=?? - but Electrical Characteristics table lists D3 as 35/50/65ms, and Typical Application uses D3; MAX6791TPSD1+ is therefore 50ms typ).
MAX6791TPSD1+ 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:
- 2.888V, 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)
MAX6791TPSD1+ FAQ
1.How can I place an order for MAX6791TPSD1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD1+ 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 MAX6791TPSD1+ reliable?
The price and inventory of MAX6791TPSD1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD1+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD1+?
MAX6791TPSD1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD1+ 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 MAX6791TPSD1+?
For technical support, including MAX6791TPSD1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD1+ requirements.
6.How does Aetrix verify that MAX6791TPSD1+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD1+ 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 MAX6791TPSD1+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD1+?
All MAX6791TPSD1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD1+, 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 MAX6791TPSD1+ part is unused and in its original packaging.
Return procedure for MAX6791TPSD1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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