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Analog Devices Inc./Maxim Integrated MAX6791TPLD2+T
- Part No.:
- MAX6791TPLD2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
MAX6791TPLD2+T from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation under load-dump conditions. It delivers up to 150mA per output (OUT1/OUT2), supports 5V to 72V input range, features fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 5V), and includes active-low RESET with 12.5ms timeout (D2 code), windowed watchdog timer, and HOLD self-hold functionality.
For engineers reviewing the MAX6791TPLD2+T datasheet, MAX6791TPLD2+T pinout, MAX6791TPLD2+T application, or MAX6791TPLD2+T equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, -40°C to +125°C operation, 68μA quiescent current, dual enable inputs (ENABLE1/ENABLE2), and integrated reverse-battery protection via GATEP drive - all critical for engine control units and body electronics.
Technical Context
The MAX6791TPLD2+T implements two independent LDO regulators: OUT1 is configurable (5V preset or adjustable 1.8V–11V via SET1), while OUT2 is fixed at 5V. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection), RESET output asserting low on undervoltage or watchdog timeout, and capacitor-adjustable reset timeout (D2 = 12.5ms nominal).
Control logic includes dual active-high enables (ENABLE1 for OUT1, ENABLE2 for OUT2), an active-low HOLD input enabling self-holding without external components, and power-fail monitoring via PFI/PFO with 1.231V internal reference. Thermal shutdown activates at +165°C with 20°C hysteresis.
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) - supports dual-rail microcontroller or sensor biasing |
| Dropout Voltage | 840mV typ at 100mA (dual) - ensures regulation down to VIN ≈ VOUT + 0.84V |
| Reset Timeout | 12.5ms (D2 code) - provides sufficient deassertion delay for μP initialization sequences |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments |
| Watchdog Type | Windowed (MAX6791/MAX6792 only) - detects both stuck-high and stuck-low WDI faults |
Pinout & Package
MAX6791TPLD2+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 AEC-Q100 stress requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Primary regulated output (5V preset or adjustable); max 150mA; requires ≥10μF bypass |
| 3 | SET1 | Feedback input - grounded for 5V preset; connected to resistive divider for adjustable output |
| 4 | PFO | Active-low open-drain power-fail output - asserts when PFI < 1.231V |
| 5 | CSWT | Watchdog timeout adjust - tied to OUT1 for fixed 280ms timeout or capacitor-grounded for adjustment |
| 6 | CSRT | Reset timeout adjust - tied to OUT1 for fixed D2 (12.5ms) timeout or capacitor-grounded |
| 7 | GND | Analog/digital ground reference and thermal path via exposed pad |
| 8 | RESET | Active-low reset output - push-pull or open-drain; asserts on OUT1 undervoltage or watchdog fault |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select - configure fast/slow fault thresholds or disable watchdog |
| 11 | WDI | Watchdog input - rising/falling edge must occur within tWD window to prevent RESET assertion |
| 12 | HOLD | Active-low hold input - forces OUT1 ON even after ENABLE1 goes low; enables self-hold circuitry |
| 13,14 | OUT2 | Secondary fixed 5V output - dedicated rail for peripherals; max 150mA; requires ≥10μF bypass |
| 15 | ENABLE2 | Active-high enable for OUT2 - internal 0.5μA pulldown; controls secondary rail independently |
| 16 | PFI | Power-fail comparator input - set threshold via resistor divider referenced to 1.231V |
| 17,18 | IN | Main regulator input - bypassed with 1μF to GND; accepts 5V–72V |
| 19 | GATEP | pFET gate driver - drives external p-channel MOSFET for reverse-battery protection |
| 20 | ENABLE1 | Active-high enable for OUT1 - internal 0.5μA pulldown; primary ON/OFF control |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables simultaneous 5V/5V or 5V/adjustable rails with separate enable control (ENABLE1/ENABLE2) |
| Windowed watchdog timer | Detects both slow (tWDI > tWD2) and fast (tWDI < tWD1) WDI faults - prevents false resets from noise or timing jitter |
| Self-holding circuit support | HOLD input eliminates need for external latch components - simplifies ignition-controlled power sequencing |
| Integrated reverse-battery protection | GATEP output drives external pFET - replaces lossy series diode, reducing voltage drop and heat |
| Capacitor-adjustable timeouts | CSRT and CSWT pins allow precise tuning of reset and watchdog periods without firmware changes |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog sensors in engine bay under wide temperature and load-dump conditions. IC Role / Device Role / Timing Role: Dual-output LDO with RESET supervision and watchdog - provides stable 5V/5V rails and ensures deterministic μP restart during brownouts. Use Value: 72V input tolerance and -40°C to +125°C rating eliminate need for external transient suppressors or derating in harsh under-hood environments. | Use Scenario: Supplying door module MCU, LIN transceiver, and LED drivers with always-on capability and fail-safe reset behavior. IC Role / Device Role / Timing Role: Regulator with HOLD function and power-fail comparator - maintains power during ignition cycling and triggers orderly shutdown on battery sag. Use Value: HOLD input enables self-hold without external latching circuitry; PFI/PFO provides early warning of battery depletion before system crash. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Power Management |
Use Scenario: Biasing radar processor, image sensor, and safety-critical communication interfaces in ADAS domain controller. IC Role / Device Role / Timing Role: High-reliability dual LDO with windowed watchdog - monitors processor health and asserts RESET on software hang or clock failure. Use Value: Windowed watchdog distinguishes between valid periodic toggles and spurious edges, reducing false resets in noisy ECU environments. | Use Scenario: Powering infotainment SoC core and I/O rails with graceful power-down during vehicle sleep mode transitions. IC Role / Device Role / Timing Role: Low-quiescent-current regulator with shutdown mode - draws only 27μA when disabled, preserving battery during extended parking. Use Value: 68μA operating IQ and 27μA shutdown current meet OEM requirements for <100μA total system standby leakage. |
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 |
|---|---|---|---|
| MAX6792TPLD2+T | Identical pinout, package, and electrical specs; differs only in watchdog window ratio configuration (WDS0/WDS1 mapping) | Same functional scope; used where alternate window ratios (e.g., 8:1 vs. 16:1) are required for specific μP timing margins | Select MAX6792TPLD2+T only if the exact watchdog window ratio defined in its datasheet table matches system timing constraints |
| TPS7B8750QKVURQ1 | Single-output (5V only), no windowed watchdog, 150mA output, 65μA IQ, 40V max input - lacks dual-rail and advanced supervision | Suitable for simpler systems needing only one regulated rail and basic reset, not dual outputs or fault-discriminating watchdog | Choose TPS7B8750QKVURQ1 only when dual outputs and windowed watchdog are unnecessary and input voltage stays ≤40V |
Compared with MAX6792TPLD2+T, the MAX6791TPLD2+T offers identical regulation and supervision but with a distinct watchdog window ratio mapping; versus TPS7B8750QKVURQ1, it provides dual outputs, 72V tolerance, and windowed watchdog - essential for complex automotive ECUs requiring redundancy and fault discrimination.
Availability
MAX6791TPLD2+T is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS domain controllers, and infotainment systems requiring stable component supply across extended temperature ranges and high-reliability qualification.
Supply support for MAX6791TPLD2+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 demanding industrial, automotive, and communications applications.
The MAX6791–MAX6796 product line delivers high-voltage, micropower linear regulators with integrated supervision specifically for automotive subsystems requiring AEC-Q100 compliance, load-dump resilience, and fail-safe power sequencing.
FAQ
What does the "D2" suffix in MAX6791TPLD2+T indicate?
The "D2" in MAX6791TPLD2+T specifies the factory-programmed reset timeout period: 12.5ms nominal (8.75ms min, 16.25ms max). This value is set by internal laser trimming and corresponds to the CSRT pin configuration - tying CSRT to OUT1 selects this fixed timeout, eliminating need for external capacitor.
Is MAX6791TPLD2+T AEC-Q100 qualified?
Yes, MAX6791TPLD2+T is AEC-Q100 qualified per Grade 0 (-40°C to +150°C junction) and Grade 1 (-40°C to +125°C ambient) requirements. The device meets stress tests for temperature cycling, humidity, and mechanical shock, and is manufactured in certified automotive-grade processes - confirmed in Maxim's official qualification report for MAX6795TPLD2/V+ and MAX6795TPSD2/V+, which share identical process and package.
Can MAX6791TPLD2+T be used with an adjustable output voltage?
Yes, MAX6791TPLD2+T supports adjustable OUT1 output from 1.8V to 11V using an external resistive divider connected between OUT1, SET1, and GND. The D2 suffix applies only to reset timeout; output voltage is determined by the external resistor ratio - the "L" in the ordering code (e.g., MAX6791TP**L**D2+T) indicates 5V preset, but SET1 grounding is optional.
Does MAX6791TPLD2+T provide reverse-battery protection?
Yes, MAX6791TPLD2+T integrates reverse-battery protection via the GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, the internal circuitry disables GATEP, blocking current flow - eliminating need for series Schottky diodes and their associated voltage drop and power loss.
What is the function of the HOLD pin on MAX6791TPLD2+T?
The HOLD pin on MAX6791TPLD2+T is an active-low input that enables self-holding operation: once ENABLE1 is asserted and OUT1 turns on, pulling HOLD low maintains OUT1 regulation even if ENABLE1 later goes low. Releasing HOLD (high or floating) shuts down OUT1 - allowing ignition-switched power sequencing without external latch components.
MAX6791TPLD2+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:
- Active
- 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:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPLD2+T FAQ
1.How can I place an order for MAX6791TPLD2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD2+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 MAX6791TPLD2+T reliable?
The price and inventory of MAX6791TPLD2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD2+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD2+T?
MAX6791TPLD2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD2+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 MAX6791TPLD2+T?
For technical support, including MAX6791TPLD2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD2+T requirements.
6.How does Aetrix verify that MAX6791TPLD2+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD2+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 MAX6791TPLD2+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD2+T?
All MAX6791TPLD2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD2+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 MAX6791TPLD2+T part is unused and in its original packaging.
Return procedure for MAX6791TPLD2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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