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Analog Devices Inc./Maxim Integrated MAX6791TPLD0+T
- Part No.:
- MAX6791TPLD0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD0+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
MAX6791TPLD0+T from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It operates from 5V to 72V input, delivers up to 150mA per output (OUT1/OUT2), features fixed 5V OUT2 and adjustable/fixed OUT1 (1.8V–11V), and includes active-low RESET with 35µs delay and 35µs fixed timeout - ideal for engine control units under load-dump conditions.
For engineers reviewing the MAX6791TPLD0+T datasheet, MAX6791TPLD0+T pinout, MAX6791TPLD0+T application, or MAX6791TPLD0+T equivalent, this page provides verified technical context on its dual-regulator architecture, watchdog timer behavior, HOLD/ENABLE sequencing, thermal protection at +125°C, and AEC-Q100-aligned design for automotive-grade reliability.
Technical Context
The MAX6791TPLD0+T implements two independent LDO regulators: OUT1 supports preset (5V/3.3V/2.5V/1.8V) or adjustable (1.8V–11V) output via SET1 feedback, while OUT2 is fixed at 5V. Its supervisory block integrates a windowed watchdog timer (with selectable tWD1/tWD2 thresholds), capacitor-adjustable reset timeout (CSRT), and power-fail comparator (PFI/PFO) referenced to 1.231V.
It uses internal current-sinking ENABLE1/ENABLE2 inputs (VIH = 1.4V, VIL = 0.4V) and an active-low HOLD pin internally pulled up to OUT1 (2µA), enabling self-holding operation without external components. Thermal shutdown activates at +165°C with 20°C hysteresis, and reverse-battery protection is implemented via GATEP-driven pFET control.
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 systems. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core + I/O rail powering. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - ensures regulation down to VIN = VOUT + 0.84V. |
| Reset Timeout | 35µs fixed (D0 option) - provides fast fault response for microcontroller reset assertion. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
| Watchdog Type | Windowed (MAX6791 variant) - detects both too-fast and too-slow WDI transitions. |
Pinout & Package
MAX6791TPLD0+T is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for 2.7W continuous dissipation and compatible with standard reflow profiles (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Main regulator output: fixed 5V/3.3V/2.5V/1.8V or adjustable (1.8V–11V) via SET1 divider. |
| 3 | SET1 | Feedback node for OUT1 - grounded for preset voltage; connected to resistive divider for adjustment. |
| 4 | PFO | Open-drain power-fail output - asserts low when PFI falls below 1.231V threshold. |
| 5 | CSWT | Watchdog timeout adjust - tied to OUT1 for fixed 280ms timeout; capacitor-to-GND for adjustment. |
| 6 | CSRT | Reset timeout adjust - tied to OUT1 for fixed 35µs (D0); capacitor-to-GND enables longer timeouts. |
| 7 | GND | Power and signal reference ground - connected to exposed pad for thermal conduction. |
| 8 | RESET | Active-low reset output - push-pull or open-drain; asserts when OUT1 drops below reset threshold. |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select - sets tWD1/tWD2 timing windows (e.g., 8×, 16×, 64×). |
| 11 | WDI | Watchdog input - requires edge transition within tWD2 (max) or outside tWD1 (min) to avoid reset. |
| 12 | HOLD | Active-low hold enable - forces OUT1 ON even after ENABLE1 goes low; releases shutdown on release. |
| 13,14 | OUT2 | Fixed 5V secondary output - independent of OUT1; requires ≥10µF output capacitance. |
| 15 | ENABLE2 | Active-high enable for OUT2 - internally pulled down (0.5µA sink); logic-compatible with 3.3V/5V systems. |
| 16 | PFI | Power-fail comparator input - set via resistor divider to trigger PFO at custom undervoltage threshold. |
| 17,18 | IN | Main input supply - bypassed with 1µF ceramic capacitor to GND for stability. |
| 19 | GATEP | pFET gate driver - controls external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1 - internally pulled down (0.5µA sink); initiates regulator startup sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 68µA enables >10-year battery standby in always-on automotive modules. |
| Dual independent enable inputs | ENABLE1 and ENABLE2 allow sequenced startup of core (OUT1) and I/O (OUT2) rails. |
| Self-holding circuit support | HOLD pin eliminates need for external latch or microcontroller GPIO to sustain power-on state. |
| Integrated reverse-battery protection | GATEP output drives pFET to block -14V reverse polarity without diode voltage drop or heat loss. |
| Windowed watchdog timer | Detects both stuck (no WDI toggle) and runaway (excessively frequent WDI) microcontroller faults. |
| Adjustable reset & watchdog timeouts | CSRT and CSWT pins accept capacitors for user-defined timeout periods beyond factory presets. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface in under-hood ECU exposed to 72V load-dump spikes and -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Dual-output LDO with supervisory functions serves as primary power supervisor and reset source for safety-critical firmware execution. Use Value: 72V input range and thermal shutdown prevent failure during cranking/load-dump; HOLD/ENABLE sequencing ensures deterministic boot order without external logic. |
Use Scenario: Supplies image sensor, ISP, and serial interface in compact rear-view camera housing subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Provides stable 5V (OUT2) and 3.3V (OUT1) rails while monitoring system health via watchdog and power-fail detection. Use Value: 150mA per rail meets peak sensor+ISP load; PFI comparator triggers graceful shutdown before brownout-induced corruption. |
| Body Control Module (BCM) | Automotive Infotainment Head Unit |
Use Scenario: Manages power to door lock actuators, lighting drivers, and LIN transceivers across multiple vehicle domains. IC Role / Device Role / Timing Role: Acts as centralized power supervisor with dual outputs and reset coordination across subsystems. Use Value: Adjustable OUT1 allows flexible rail generation; RESET output synchronizes recovery across distributed nodes after power interruption. |
Use Scenario: Delivers clean, sequenced power to application processor, audio codec, and display interface in head unit with strict EMC requirements. IC Role / Device Role / Timing Role: Regulates core and I/O supplies while providing watchdog supervision to prevent OS hang during CAN bus activity. Use Value: Windowed watchdog detects both software lockup and excessive interrupt latency; GATEP enables reverse-polarity protection without efficiency penalty. |
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 |
|---|---|---|---|
| MAX6792TPLD0+T | Same pinout and features, but includes programmable window ratio (via WDS0/WDS1) and identical D0 reset timeout. | Preferred where fine-grained watchdog window tuning is required for ASIL-B diagnostics. | Select MAX6792TPLD0+T if window ratio configurability is needed; otherwise MAX6791TPLD0+T suffices for fixed-ratio use. |
| TPS7B8750QKVURQ1 | Single-output 500mA LDO (no dual output), fixed 5V only, no windowed watchdog, but AEC-Q100 Grade 0 (−40°C to +150°C). | Suitable for simpler systems needing higher current on one rail, not dual-rail or advanced supervision. | Choose TPS7B8750QKVURQ1 only when single-rail 500mA capability outweighs need for dual outputs and windowed watchdog. |
Compared with MAX6792TPLD0+T, the MAX6791TPLD0+T offers identical D0 reset timing and dual-output capability but lacks user-selectable watchdog window ratios; versus TPS7B8750QKVURQ1, it trades higher current and extended temperature for dual-rail flexibility and comprehensive supervision - making it optimal for complex multi-rail automotive ECUs.
Availability
MAX6791TPLD0+T 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 across extended temperature and high-reliability environments.
Supply support for MAX6791TPLD0+T 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 MAX6791TPLD0+T belongs to the MAX6791–MAX6796 family of high-voltage micropower regulators, engineered specifically for automotive power-supply supervision with integrated reset, watchdog, and reverse-battery protection.
FAQ
What output voltage options does the MAX6791TPLD0+T support?
The MAX6791TPLD0+T supports fixed OUT2 at 5V and configurable OUT1 at 5V, 3.3V, 2.5V, or 1.8V - or adjustable from 1.8V to 11V using an external resistor divider on SET1. The "D0" suffix confirms fixed 35µs reset timeout and preset output configuration per ordering guide Table 1.
How does the HOLD function operate in the MAX6791TPLD0+T?
In the MAX6791TPLD0+T, the HOLD pin is active-low and internally pulled up to OUT1 with 2µA. When driven low after ENABLE1 activation, it latches the regulator ON - maintaining OUT1/OUT2 even if ENABLE1 returns low. Releasing HOLD (to high-impedance or OUT1) shuts down the outputs, enabling self-holding without external components.
Is the MAX6791TPLD0+T AEC-Q100 qualified?
The MAX6791TPLD0+T is not explicitly listed as AEC-Q100 qualified in its datasheet; however, it is specified for −40°C to +125°C operation, includes automotive-grade protections (load-dump tolerance, reverse-battery, thermal shutdown), and shares design heritage with AEC-Q100-certified variants like MAX6795TPLD2/V+. Full qualification status must be confirmed via Maxim/Analog Devices' official automotive compliance documentation.
What is the purpose of the GATEP pin on the MAX6791TPLD0+T?
The GATEP pin on the MAX6791TPLD0+T drives the gate of an external p-channel MOSFET to implement reverse-battery protection. When reverse polarity is detected, GATEP pulls low to turn off the pFET, blocking current flow - eliminating the need for series Schottky diodes and their associated voltage drop and power loss.
Can the MAX6791TPLD0+T be used in single-output configurations?
Yes - although the MAX6791TPLD0+T is a dual-output device (OUT1 + fixed 5V OUT2), it can operate with only OUT1 enabled by holding ENABLE2 low. OUT2 remains inactive and draws negligible current, allowing the MAX6791TPLD0+T to serve single-rail applications where dual capability provides future-proofing or margin.
MAX6791TPLD0+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6791TPLD0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD0+T 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+T reliable?
The price and inventory of MAX6791TPLD0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD0+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD0+T?
MAX6791TPLD0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD0+T 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+T?
For technical support, including MAX6791TPLD0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD0+T requirements.
6.How does Aetrix verify that MAX6791TPLD0+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD0+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD0+T?
All MAX6791TPLD0+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD0+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6791TPLD0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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