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Analog Devices Inc./Maxim Integrated MAX6791TPTD1+T
- Part No.:
- MAX6791TPTD1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPTD1+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,068
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Product details
Overview
MAX6791TPTD1+T 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, features 68μA quiescent current, fixed 5V/3.3V output options, and active-low open-drain RESET with 92.5% reset threshold-used in engine control units to maintain microcontroller stability during load-dump transients.
For engineers reviewing the MAX6791TPTD1+T datasheet, MAX6791TPTD1+T pinout, MAX6791TPTD1+T application, or MAX6791TPTD1+T equivalent, key selection criteria include dual-enable control (ENABLE1/ENABLE2), HOLD input for self-holding circuit implementation, windowed watchdog timer (MAX6791-specific), thermal protection up to +125°C, and AEC-Q100-qualified operation in harsh automotive environments.
Technical Context
The MAX6791TPTD1+T implements two independent LDO regulators: OUT1 (adjustable or preset 1.8V/2.5V/3.3V/5V) and fixed 5V OUT2. Its supervisory block includes a windowed watchdog timer with selectable fast/slow fault detection (tWD1/tWD2), RESET assertion triggered by either output undervoltage or watchdog timeout, and capacitor-adjustable reset timeout via CSRT.
It integrates reverse-battery protection via GATEP-driven pFET, power-fail monitoring through PFI/PFO with 1.231V internal reference, and HOLD functionality that latches regulator ON after initial enable-enabling ignition-key-triggered hold without external components. All logic inputs (ENABLE1/ENABLE2/HOLD/WDI) are referenced to OUT1/OUT for rail-to-rail compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump surges without external clamping |
| Quiescent Current | 68μA typical - enables always-on systems (e.g., telematics) with minimal battery drain |
| Output Current | 150mA per output - supports dual-rail MCU + CAN transceiver powering from single IC |
| Dropout Voltage | 840mV typ at 100mA (dual) - maintains regulation down to VIN = VOUT + 0.84V under full load |
| Reset Threshold | 92.5% of OUT1 nominal - ensures reliable µP reset before functional voltage collapse |
| Watchdog Type | Windowed (MAX6791 only) - detects both stuck-high and stuck-low WDI faults independently |
| Operating Temp | −40°C to +125°C - fully specified for under-hood automotive deployment |
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 | Main regulator output (preset or adjustable 1.8V–11V); requires ≥10µF ceramic bypass |
| 3 | SET1 | Feedback node for OUT1; GND = preset voltage, resistive divider = adjustable mode |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI < 1.231V (e.g., battery sag detection) |
| 5 | CSWT | Watchdog timeout adjust; connect to OUT1 for fixed 280ms, or capacitor to GND for scaling |
| 6 | CSRT | Reset timeout adjust; same configuration as CSWT, supporting 35μs–200ms fixed/adjustable periods |
| 7 | GND | Analog/digital ground reference; tied to exposed pad for thermal conduction |
| 8 | RESET | Active-low open-drain reset output; driven low on OUT1 undervoltage or watchdog fault |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select (MAX6791 only); set 8:1, 16:1, or 64:1 fast/slow fault windows |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD1–tWD2 window to avoid reset |
| 12 | HOLD | Active-low latch control; forces OUT1 ON even after ENABLE1 goes low |
| 13,14 | OUT2 | Fixed 5V secondary output; independent of OUT1 regulation and enable control |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct MCU GPIO drive |
| 16 | PFI | Power-fail comparator input; use resistive divider to set custom brownout threshold |
| 17,18 | IN | Main input supply pins; require ≥1μF ceramic bypass to GND near package |
| 19 | GATEP | pFET gate driver; sinks current to turn on external reverse-battery protection MOSFET |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5μA pulldown enables direct MCU control |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables detection of both frozen and oscillating microcontroller clocks-critical for ASIL-B safety compliance |
| Self-Holding Circuit Support | HOLD input eliminates need for external latch or relay in ignition-controlled power sequencing |
| Reverse-Battery Protection Drive | GATEP output directly drives p-channel MOSFET, removing series diode losses and heat buildup |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate control of OUT1 and OUT2-enabling staggered power-up sequences |
| Capacitor-Adjustable Timing | CSRT and CSWT pins support field-tunable reset/watchdog timeouts without firmware changes |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface in gasoline/diesel ECU under wide battery voltage swings (6V–16V) and load-dump events (up to 72V). IC Role / Device Role / Timing Role: Dual-output LDO with RESET supervision ensures deterministic MCU boot and brownout recovery; HOLD enables ignition-key-triggered latching. Use Value: Eliminates need for discrete reset IC and external hold circuit-reducing BOM count and PCB area by 30% vs. discrete solution. | Use Scenario: Supplies vision processor and radar SoC in forward-collision warning module, requiring clean 3.3V/5V rails and fail-safe reset signaling. IC Role / Device Role / Timing Role: OUT1 powers processor core (3.3V), OUT2 supplies I/O (5V); windowed watchdog monitors processor health with configurable fault windows. Use Value: Detects both software lockup (slow WDI) and clock failure (fast WDI), meeting ISO 26262 diagnostic coverage requirements. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) |
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in always-on vehicle connectivity unit with ultra-low standby current. IC Role / Device Role / Timing Role: 68μA quiescent current enables >10-year battery backup life; PFI/PFO provides early battery depletion warning before system shutdown. Use Value: Extends sleep-mode battery life by 3× compared to standard 200μA LDOs-critical for parked-state telematics. | Use Scenario: Manages power to door modules, lighting drivers, and LIN transceivers in centralized body electronics architecture. IC Role / Device Role / Timing Role: Dual outputs feed separate domains; RESET output synchronizes domain resets during wake-up from sleep mode. Use Value: Single-chip solution replaces two LDOs + supervisor IC, reducing thermal stress and improving layout density. |
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 |
|---|---|---|---|
| MAX6792TPTD1+T | Same pinout and features, but with 87.5% reset threshold (vs. 92.5% in MAX6791) and different WDS0/WDS1 mapping | Suitable where tighter reset margin is required before MCU functional failure | Select MAX6792TPTD1+T if system requires earlier reset assertion during gradual voltage decay |
| TPS7B8750QKVURQ1 | Single-output (5V only), no windowed watchdog, 65μA IQ, 40V max input, SO PowerPAD package | Lacks dual output and advanced watchdog; suited for simpler, cost-sensitive modules | Choose TPS7B8750QKVURQ1 only when dual output and windowed watchdog are not required |
Compared with MAX6792TPTD1+T and TPS7B8750QKVURQ1, the MAX6791TPTD1+T uniquely combines dual regulated outputs, 72V tolerance, windowed watchdog, and HOLD latching-making it the only option for complex automotive subsystems requiring coordinated power sequencing and robust fault detection.
Availability
MAX6791TPTD1+T is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPTD1+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 family was engineered specifically for automotive power-supply supervision-integrating high-voltage LDO regulation, windowed watchdog, and reverse-battery protection into a single AEC-Q100-qualified package.
FAQ
What output voltage options does the MAX6791TPTD1+T support?
The MAX6791TPTD1+T supports preset OUT1 voltages of 1.8V, 2.5V, 3.3V, or 5.0V (selected by grounding SET1), and an adjustable range from 1.8V to 11V using an external resistor divider. OUT2 is fixed at 5.0V. These configurations are confirmed in the Electrical Characteristics table and Pin Description section of the MAX6791TPTD1+T datasheet.
Does the MAX6791TPTD1+T include reverse-battery protection?
Yes, the MAX6791TPTD1+T includes integrated reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET to block reverse current flow. This eliminates the need for series Schottky diodes and reduces power loss-confirmed in the Detailed Description and Functional Diagram sections of the MAX6791TPTD1+T datasheet.
How does the HOLD function operate in the MAX6791TPTD1+T?
The HOLD input in the MAX6791TPTD1+T is active-low and enables self-holding behavior: once ENABLE1 turns ON OUT1, pulling HOLD low latches the regulator ON-even if ENABLE1 later goes low. Releasing HOLD shuts down OUT1. This behavior is explicitly documented in the Enable and Hold Inputs section and Table 3 of the MAX6791TPTD1+T datasheet.
What is the watchdog timeout configuration for the MAX6791TPTD1+T?
The MAX6791TPTD1+T features a windowed watchdog timer with two timeout thresholds: fast fault (tWD1) and slow fault (tWD2). WDS0 and WDS1 pins select ratios of 8:1, 16:1, or 64:1 between them. Timeout periods are either fixed (via CSWT = OUT1) or capacitor-adjustable-details are provided in the Watchdog Timer section and Table 4 of the MAX6791TPTD1+T datasheet.
Is the MAX6791TPTD1+T qualified for automotive use?
Yes, the MAX6791TPTD1+T is AEC-Q100 qualified and specified for −40°C to +125°C operation. While the base MAX6791TPTD1+T variant is not explicitly marked "/V" in the Ordering Information table, its electrical specifications, thermal performance, and packaging (TQFN-EP) align with automotive-grade requirements-and it shares the same qualification status as /V-marked variants like MAX6795TPLD2/V+ per Maxim's product family documentation.
MAX6791TPTD1+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:
- 3.053V, 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)
MAX6791TPTD1+T FAQ
1.How can I place an order for MAX6791TPTD1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPTD1+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 MAX6791TPTD1+T reliable?
The price and inventory of MAX6791TPTD1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPTD1+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPTD1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPTD1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPTD1+T?
MAX6791TPTD1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPTD1+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 MAX6791TPTD1+T?
For technical support, including MAX6791TPTD1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPTD1+T requirements.
6.How does Aetrix verify that MAX6791TPTD1+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPTD1+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 MAX6791TPTD1+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPTD1+T?
All MAX6791TPTD1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPTD1+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 MAX6791TPTD1+T part is unused and in its original packaging.
Return procedure for MAX6791TPTD1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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