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Analog Devices Inc./Maxim Integrated MAX6791TPWD2+T
- Part No.:
- MAX6791TPWD2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPWD2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
MAX6791TPWD2+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 (5V–72V input). It delivers up to 150mA per output, features a 5V fixed OUT1 and adjustable OUT2 (1.8V–11V), 68μA quiescent current, and includes windowed watchdog timer, RESET with capacitor-adjustable timeout, and HOLD/ENABLE control logic. Used in engine control units and body electronics where low-power startup and fault resilience are critical.
For engineers reviewing the MAX6791TPWD2+T datasheet, MAX6791TPWD2+T pinout, MAX6791TPWD2+T application, or MAX6791TPWD2+T equivalent, key selection criteria include its dual-regulator architecture with independent enable inputs, AEC-Q100-qualified thermal performance (−40°C to +125°C), 5mm × 5mm TQFN-20 EP package, and configurable reset/watchdog timing - all validated for automotive power-rail supervision and microcontroller reset management.
Technical Context
The MAX6791TPWD2+T implements two independent LDO regulators: OUT1 is fixed at 5V (±2.5% over temperature), while OUT2 is adjustable via external resistor divider on SET1. Its windowed watchdog accepts both fast-fault (tWD1) and slow-fault (tWD2) detection windows, selectable via WDS0/WDS1 pins, with fixed 280ms nominal timeout or capacitor-adjustable range.
Supervision circuitry includes a push-pull or open-drain RESET output asserting low when either regulated output drops below 92.5%/87.5% of nominal voltage, plus a PFI comparator referenced to 1.231V with 35μs propagation delay. The HOLD input enables self-holding behavior without external latching components by forcing regulator ON after initial ENABLE1 assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external protection |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive applications |
| Output Current | 150mA per output - supports dual-rail MCU peripherals and sensors simultaneously |
| Dropout Voltage | 420mV typ. at 100mA (single), 840mV typ. at 100mA (dual) - ensures regulation during cold-crank battery dips |
| Reset Threshold Accuracy | ±2.5% over −40°C to +125°C - guarantees deterministic microcontroller reset across full automotive temp range |
| Watchdog Timeout | 280ms min fixed or capacitor-adjustable - provides flexible firmware supervision with windowed fault detection |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive deployment |
Pinout & Package
MAX6791TPWD2+T is housed in a thermally enhanced 5mm × 5mm, 20-pin TQFN-EP package (exposed pad connected to GND), rated for 2.7W continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Regulator 1 Output | Fixed 5V output (±2.5%), capable of sourcing 150mA; requires ≥10μF ceramic output capacitor |
| SET1 | Feedback Input | Connect to GND for preset 5V; connect external resistive divider for adjustable 1.8V–11V output |
| PFO | Power-Fail Comparator Output | Open-drain active-low signal triggered when PFI falls below 1.231V threshold |
| CSWT | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor to GND for adjustable period |
| CSRT | Reset Timeout Adjust | Connect to OUT1 for fixed timeout options (35μs–200ms); capacitor adjusts continuously |
| RESET | Supervisory Reset Output | Push-pull or open-drain active-low output asserting during brownout or watchdog fault |
| HOLD | Regulator Hold Control | Active-low input enabling self-holding: keeps OUT1/OUT2 ON even after ENABLE1 goes low |
| ENABLE1 | Regulator 1 Enable | Active-high input controlling OUT1; internally pulled down (0.5μA sink) |
| ENABLE2 | Regulator 2 Enable | Active-high input controlling OUT2; internally pulled down (0.5μA sink) |
| WDI | Watchdog Input | Accepts pulse train from µP; missing edge within tWD1/tWD2 triggers windowed reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Supports simultaneous fast-fault (tWD1) and slow-fault (tWD2) detection via WDS0/WDS1 logic inputs |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate sequencing and power-gating of each output rail |
| Self-Holding Circuit | HOLD input eliminates need for external latch or microcontroller GPIO to sustain regulator ON state |
| Reverse-Battery Protection Drive | GATEP pin drives external pFET gate to block reverse polarity without series diode losses |
| Thermal & Overcurrent Protection | Integrated shutdown at +165°C with 20°C hysteresis and short-circuit current limiting (200–240mA) |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powering MCU, CAN transceiver, and sensor interface ICs in harsh under-hood environments with wide battery voltage swings and transient spikes. IC Role / Device Role / Timing Role: Dual-output LDO providing isolated 5V (OUT1) and adjustable 3.3V (OUT2) rails with synchronized RESET assertion during brownout. Use Value: 68μA quiescent current extends battery life during vehicle sleep mode; 72V input tolerance eliminates need for external TVS clamping. | Use Scenario: Supplying door module microcontrollers and LIN transceivers where space-constrained PCB layout demands integrated supervision. IC Role / Device Role / Timing Role: Regulator with HOLD-enabled self-latching and watchdog supervision replaces discrete enable logic + reset IC + LDO stack. Use Value: Reduces BOM count by 3–4 components; 5mm × 5mm TQFN footprint saves >30% board area vs. discrete solution. |
| Advanced Driver Assistance Systems (ADAS) | Telematics Control Unit (TCU) |
Use Scenario: Powering vision processor SoCs requiring clean, sequenced 1.8V/3.3V rails and fail-safe reset coordination during ignition cycling. IC Role / Device Role / Timing Role: Dual LDO with capacitor-adjustable CSRT/CSWT enables precise reset and watchdog timing matching SoC requirements. Use Value: Adjustable reset timeout prevents spurious resets during slow power-rail ramp-up; windowed watchdog detects firmware hangs without false positives. | Use Scenario: Supporting cellular modem, GNSS receiver, and eSIM power domains in always-connected vehicle connectivity modules. IC Role / Device Role / Timing Role: High-voltage input regulator with PFI comparator monitors backup battery health and triggers orderly shutdown before depletion. Use Value: PFI input referenced to 1.231V allows accurate battery voltage monitoring with <0.5% hysteresis; 35μs response enables rapid low-battery alerts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO with supervisory functions applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6793TPWD2+T | Same pinout and package; fixed 5V OUT1 + fixed 5V OUT2 (no adjustable output) | Lacks SET1 adjustability; suited for dual 5V rail systems only | Select when both outputs require identical 5V regulation and no voltage flexibility is needed |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input only; no watchdog, RESET, or HOLD features | No supervision capability; limited to low-voltage post-regulation stages | Use only in non-automotive, low-input-voltage secondary regulation where supervision is handled externally |
Compared with MAX6793TPWD2+T and TLV70733PDQNR, MAX6791TPWD2+T uniquely combines dual adjustable/fixed outputs, windowed watchdog, and HOLD-based latching in one AEC-Q100-qualified device - eliminating external supervision logic while supporting full automotive battery voltage range and thermal extremes.
Availability
MAX6791TPWD2+T is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS domain controllers, and telematics units requiring stable component supply under extended temperature and high-reliability automotive conditions.
Supply support for MAX6791TPWD2+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 targets automotive power-supply supervision, delivering high-voltage LDO regulation with integrated reset, watchdog, power-fail detection, and reverse-battery protection in compact thermally enhanced packages.
FAQ
What output voltage options does the MAX6791TPWD2+T support?
The MAX6791TPWD2+T supports a fixed 5V output on OUT1 and an adjustable output on OUT2 ranging from 1.8V to 11V, set via external resistor divider on SET1. Preset options include 5V, 3.3V, 2.5V, and 1.8V. The MAX6791TPWD2+T datasheet specifies output accuracy as ±2.5% over −40°C to +125°C, with load regulation of ≤1.5% across 1mA–150mA per output.
How does the HOLD function operate in the MAX6791TPWD2+T?
The HOLD input in the MAX6791TPWD2+T enables self-holding behavior: once ENABLE1 is asserted and OUT1 becomes active, pulling HOLD low maintains regulator output even if ENABLE1 is subsequently deasserted. Releasing HOLD (high or floating) shuts down OUT1/OUT2. HOLD is internally pulled up to OUT1 with 2μA current, allowing direct connection to OUT1 for automatic latching - a feature confirmed in the MAX6791TPWD2+T functional diagram and electrical characteristics table.
What is the watchdog timeout configuration for the MAX6791TPWD2+T?
The MAX6791TPWD2+T features a windowed watchdog timer with selectable fast (tWD1) and slow (tWD2) timeout thresholds. Default fixed timeout is 280ms (min), adjustable via capacitor on CSWT. WDS0/WDS1 pins select window ratios (8×, 16×, or 64×), enabling detection of both stuck-high and stuck-low WDI faults. This windowed behavior is exclusive to MAX6791/MAX6792 variants and explicitly documented for MAX6791TPWD2+T in the watchdog section of its datasheet.
Does the MAX6791TPWD2+T include reverse-battery protection?
Yes, the MAX6791TPWD2+T integrates reverse-battery protection drive via the GATEP pin, which controls an external p-channel MOSFET to block reverse polarity without series diode voltage drop or power loss. The GATEP driver provides 8V–12V gate drive at VIN = 20V and clamps IN-to-GATEP at 13.8V–18.8V, enabling robust protection against −12V reverse battery events - a capability verified in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX6791TPWD2+T datasheet.
What package type and thermal performance does the MAX6791TPWD2+T use?
The MAX6791TPWD2+T uses a 5mm × 5mm, 20-pin TQFN-EP package with exposed pad (EP) electrically and thermally connected to GND. It dissipates up to 2.7W continuously at +70°C ambient, with derating of 33.3mW/°C above that temperature. Thermal shutdown activates at +165°C with 20°C hysteresis, and the device is qualified per AEC-Q100 Grade 0 (−40°C to +125°C), making it suitable for under-hood automotive deployment - all confirmed in the MAX6791TPWD2+T packaging and thermal specifications.
MAX6791TPWD2+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:
- 1.665V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPWD2+T FAQ
1.How can I place an order for MAX6791TPWD2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPWD2+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 MAX6791TPWD2+T reliable?
The price and inventory of MAX6791TPWD2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPWD2+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPWD2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPWD2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPWD2+T?
MAX6791TPWD2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPWD2+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 MAX6791TPWD2+T?
For technical support, including MAX6791TPWD2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPWD2+T requirements.
6.How does Aetrix verify that MAX6791TPWD2+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPWD2+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 MAX6791TPWD2+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPWD2+T?
All MAX6791TPWD2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPWD2+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 MAX6791TPWD2+T part is unused and in its original packaging.
Return procedure for MAX6791TPWD2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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