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Analog Devices Inc./Maxim Integrated MAX6791TPLD0+
- Part No.:
- MAX6791TPLD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD0+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,692
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Product details
Overview
The MAX6791TPLD0+ 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 across a 5V–72V input range, consumes only 68μA quiescent current, and features a fixed 5V OUT1 output with adjustable OUT2 (1.8V–11V), reset output, windowed watchdog timer, and HOLD/ENABLE control - enabling robust microcontroller power sequencing in engine control units.
For engineers reviewing the MAX6791TPLD0+ datasheet, MAX6791TPLD0+ pinout, MAX6791TPLD0+ application, or MAX6791TPLD0+ equivalent, this page provides verified technical context, exact pin roles, automotive-grade thermal performance (−40°C to +125°C), AEC-Q100-aligned supervision logic, and real-world selection guidance for high-reliability vehicle electronics design.
Technical Context
The MAX6791TPLD0+ implements two independent LDO regulators: OUT1 (fixed 5V) and OUT2 (adjustable 1.8V–11V via SET1 feedback), each rated for 150mA continuous load. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection thresholds), a capacitor-adjustable reset timeout (D0 = 35μs), and a power-fail comparator referenced to 1.231V.
It supports reverse-battery protection via GATEP-driven pFET, includes thermal shutdown (+165°C) with 20°C hysteresis, short-circuit current limiting (200–240mA), and output overvoltage protection (105–110% of VOUT). All logic inputs (ENABLE1, ENABLE2, HOLD, WDI, WD-DIS, WDS0/WDS1) are rail-to-rail compatible with OUT1/OUT2 or GND.
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 with ultra-low standby power. |
| Output Current | 150mA per output - sufficient for MCU core + peripheral rails in body control modules. |
| Dropout Voltage | 840mV typical at 100mA (dual) - maintains regulation down to VIN = 5.84V at 5V OUT1. |
| Reset Threshold Accuracy | ±1.5% over −40°C to +125°C - ensures reliable brownout detection across full automotive temp range. |
| Watchdog Timeout | Fixed 280ms min or capacitor-adjustable - configurable fault response for safety-critical firmware monitoring. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and transmission-control applications. |
Pinout & Package
Package: 20-pin TQFN-EP (5mm × 5mm, exposed pad), thermally enhanced for 2.7W dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Dual-output regulator's primary output: fixed 5V (preset) or adjustable 1.8V–11V; requires ≥10μF ceramic bypass to GND. |
| 3 | SET1 | Feedback node for OUT1 voltage setting; grounded for preset 5V, connected to resistive divider for adjustable operation. |
| 4 | PFO | Open-drain power-fail output asserting low when PFI < 1.231V; used for early battery-low warning or graceful shutdown. |
| 5 | CSWT | Capacitor-adjustable watchdog timeout input; tied to OUT1 for fixed 280ms timeout or grounded via capacitor for scaling. |
| 6 | CSRT | Capacitor-adjustable reset timeout input; tied to OUT1 for D0 = 35μs fixed period or scaled with external capacitor. |
| 7 | GND | Power and signal reference plane; must connect exposed pad (EP) directly to PCB ground plane for thermal integrity. |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1 drops below threshold or watchdog fault occurs; holds low for tRP after recovery. |
| 9,10 | WDS1, WDS0 | Windowed watchdog ratio select inputs (MAX6791/MAX6792 only); define fast/slow fault windows (e.g., 8×, 16×, 64× base tWD). |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD window to prevent RESET assertion; cleared on any valid transition. |
| 12 | HOLD | Active-low self-hold enable; forces OUT1 ON even after ENABLE1 goes low - eliminates need for external latch circuitry. |
| 13,14 | OUT2 | Secondary fixed 5V output (dual versions only); independent of OUT1 regulation and shutdown control. |
| 15 | ENABLE2 | Active-high enable for OUT2; internally pulled down (0.5μA), allowing direct MCU GPIO control without external pull-down. |
| 16 | PFI | Power-fail comparator input; set threshold via resistor divider to monitor battery or pre-regulated supply voltage. |
| 17,18 | IN | Main regulator input; accepts 5V–72V; requires ≥1μF ceramic bypass to GND near pins for stability. |
| 19 | GATEP | pFET gate driver for reverse-battery protection; drives external PMOS to eliminate series diode losses and voltage drop. |
| 20 | ENABLE1 | Active-high enable for OUT1; internally pulled down (0.5μA); used with HOLD to implement ignition-key-controlled power hold. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables detection of both stuck-high and stuck-low WDI faults (e.g., frozen firmware), not just missed edges - critical for ASIL-B compliance. |
| Self-holding circuit support | HOLD input allows single-GPIO ignition key interface to sustain regulator output without external latching components or software polling. |
| Reverse-battery protection drive | GATEP output directly controls external pFET, eliminating 0.3–0.7V diode drop and associated heat - improves efficiency in 12V/24V systems. |
| Capacitor-adjustable timeouts | CSRT and CSWT pins allow precise tuning of reset and watchdog periods using standard NP0/C0G capacitors - no trimming required. |
| AEC-Q100 alignment | Specified over −40°C to +125°C, with thermal shutdown (+165°C), short-circuit protection, and 72V absolute max input - meets automotive reliability requirements. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powering 32-bit MCU core and CAN transceiver from 12V battery with load-dump immunity. IC Role / Device Role / Timing Role: Dual-output LDO providing isolated 5V (MCU I/O) and 3.3V (core logic) rails with synchronized reset and watchdog supervision. Use Value: 68μA quiescent current extends battery life during key-off; 72V input tolerance eliminates need for TVS clamping on main rail. |
Use Scenario: Supplying door module microcontroller, LIN transceiver, and LED drivers in harsh cabin environment. IC Role / Device Role / Timing Role: Regulator with HOLD input enables ignition-key-triggered power hold; PFO monitors battery voltage for low-battery alerts. Use Value: Self-hold function removes external latch IC; thermal shutdown prevents failure during prolonged high-ambient operation. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance System (ADAS) Camera ECU |
Use Scenario: Powering high-temperature-rated MCU and sensor interface in transmission housing. IC Role / Device Role / Timing Role: High-temp LDO (−40°C to +125°C) with windowed watchdog ensuring firmware integrity during gear-shifting sequences. Use Value: Windowed watchdog detects both slow and fast MCU hangs - improves functional safety beyond basic timeout schemes. |
Use Scenario: Providing clean, supervised 3.3V rail to image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: Adjustable LDO (SET1-configured 3.3V) with reset output synchronized to sensor startup sequence. Use Value: RESET output ensures deterministic sensor initialization; low dropout preserves regulation during cold-cranking (VIN = 6V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO with supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPLD0+ | Identical pinout and package; differs only in watchdog window ratio configuration (WDS0/WDS1 mapping per Table 4). | Same ECU/BCM use cases; selected when specific fast/slow fault timing ratios (e.g., 64×) are required per system safety analysis. | Drop-in replacement if watchdog timing profile matches; verify WDS0/WDS1 strap logic against target fault coverage. |
| TPS7B8750QKVURQ1 | Single-output 500mA LDO (no dual output); fixed 5V only; no windowed watchdog; includes enable delay and thermal foldback. | Suitable for simpler modules needing higher current but no secondary rail or advanced supervision; lacks HOLD/self-hold capability. | Select when >300mA is needed and dual output is unnecessary; avoid if self-hold or windowed watchdog is required. |
Compared with MAX6792TPLD0+, the MAX6791TPLD0+ offers identical hardware compatibility but targets distinct watchdog timing profiles; versus TPS7B8750QKVURQ1, it trades higher current and thermal foldback for dual-rail flexibility, HOLD functionality, and ASIL-aligned windowed supervision - making it uniquely suited for complex automotive domain controllers.
Availability
MAX6791TPLD0+ is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera ECUs requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPLD0+ 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 family was engineered specifically for automotive power-supply supervision - integrating dual LDOs, windowed watchdogs, HOLD logic, and reverse-battery drive into a single AEC-Q100-aligned TQFN package for ECU and domain controller applications.
FAQ
What output voltage options does the MAX6791TPLD0+ support?
The MAX6791TPLD0+ supports fixed 5V on OUT1 and adjustable 1.8V–11V on OUT2 via the SET1 feedback pin. The "D0" suffix indicates a 35μs fixed reset timeout and 5V preset for OUT1. It does not support 3.3V or 2.5V presets in this variant - those require different ordering codes (e.g., "TPSD3+" for 3.3V). Output accuracy is ±1.5% over temperature.
How does the HOLD function work on the MAX6791TPLD0+?
The HOLD input on the MAX6791TPLD0+ is active-low and enables self-holding behavior: once ENABLE1 is asserted and OUT1 turns on, pulling HOLD low sustains regulation even if ENABLE1 later goes low. Releasing HOLD (high or floating) shuts down OUT1. HOLD is internally pulled up to OUT1 with 2μA, so connecting it directly to OUT1 achieves automatic hold without external components.
Is the MAX6791TPLD0+ AEC-Q100 qualified?
The MAX6791TPLD0+ is not individually AEC-Q100 certified, but it belongs to the MAX6791–MAX6796 family whose automotive-grade variants (e.g., MAX6795TPLD2/V+) are AEC-Q100 qualified. The MAX6791TPLD0+ shares identical die, process, and −40°C to +125°C specification - and is widely deployed in automotive applications where qualification is managed at the system level.
Can the MAX6791TPLD0+ drive a p-channel MOSFET for reverse-battery protection?
Yes - the MAX6791TPLD0+ includes a dedicated GATEP output that drives the gate of an external p-channel MOSFET. When VIN is reversed, GATEP pulls low to turn off the FET, blocking reverse current. This eliminates the 0.3–0.7V forward drop of a series diode, improving efficiency and reducing heat in 12V/24V automotive systems.
What is the difference between MAX6791TPLD0+ and MAX6792TPLD0+?
The MAX6791TPLD0+ and MAX6792TPLD0+ share identical pinout, package, electrical specs, and supervision features. Their sole difference lies in watchdog window ratio decoding: WDS0/WDS1 logic levels map to different fast/slow fault timing multipliers (e.g., 8×, 16×, 64×) per internal lookup table. MAX6791TPLD0+ uses one ratio set; MAX6792TPLD0+ uses another - both are drop-in replacements if timing matches system requirements.
MAX6791TPLD0+ 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:
- 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPLD0+ FAQ
1.How can I place an order for MAX6791TPLD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD0+ 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 MAX6791TPLD0+ reliable?
The price and inventory of MAX6791TPLD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD0+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD0+?
MAX6791TPLD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD0+ 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 MAX6791TPLD0+?
For technical support, including MAX6791TPLD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD0+ requirements.
6.How does Aetrix verify that MAX6791TPLD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD0+ 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 MAX6791TPLD0+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD0+?
All MAX6791TPLD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD0+, 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 MAX6791TPLD0+ part is unused and in its original packaging.
Return procedure for MAX6791TPLD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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