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Analog Devices Inc./Maxim Integrated MAX6791TPTD4+
- Part No.:
- MAX6791TPTD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPTD4+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,341
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Product details
Overview
MAX6791TPTD4+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation under 5V–72V input and load-dump conditions. It delivers up to 150mA per output (OUT1/OUT2), features fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 5V, 3.3V), includes push-pull RESET with 200ms timeout (D4), and operates across –40°C to +125°C.
For engineers reviewing the MAX6791TPTD4+ datasheet, MAX6791TPTD4+ pinout, MAX6791TPTD4+ application, or MAX6791TPTD4+ equivalent, key selection considerations include its dual-enable architecture (ENABLE1/ENABLE2), HOLD self-holding functionality, windowed watchdog capability (on MAX6791/MAX6792 variants), thermal protection, and AEC-Q100-compliant performance in high-ambient automotive environments.
Technical Context
The MAX6791TPTD4+ implements two independent LDO regulators: OUT1 supports preset (5V/3.3V/2.5V/1.8V) or adjustable (1.8V–11V) output via SET1 feedback; OUT2 is fixed at 5V. Its supervisory block integrates a reset circuit with 92.5% (L/M) or 87.5% (T/S/Z/Y/W/V) threshold tracking relative to OUT1, and a capacitor-adjustable or fixed 200ms reset timeout (CSRT = D4).
It features a windowed watchdog timer (MAX6791-specific) with selectable fast/slow fault detection (tWD1/tWD2), disable via WD-DIS or WDS0/WDS1, and reverse-battery protection via GATEP-driven pFET. All logic inputs (ENABLE1/ENABLE2/HOLD) are compatible with 1.4V VIH and 0.4V VIL thresholds, supporting direct microcontroller interfacing without level-shifting.
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 battery monitoring in sleep-mode automotive ECUs |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core + peripheral rail in body control modules |
| Dropout Voltage | 840mV typ @ 100mA (dual) - maintains regulation down to VIN = VOUT + 0.84V, critical for cold-crank operation |
| Reset Timeout | 200ms (D4 option) - ensures reliable µP initialization after brownout recovery |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive placement |
| Reset Threshold | 92.5% of OUT1 nominal voltage (L/M option) - tracks regulated output for accurate undervoltage detection |
Pinout & Package
MAX6791TPTD4+ is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for 2.7W continuous power dissipation and optimized for high-temperature automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Primary regulated output (5V/3.3V/2.5V/1.8V or adjustable); max 150mA; requires ≥10µF ceramic bypass to GND |
| 3 - SET1 | OUT1 Feedback Input | Connect to GND for preset voltage; connect external resistor divider for 1.8V–11V adjustment |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal asserting when PFI < 1.231V; used for early battery-fail warning |
| 5 - CSWT | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor to GND for adjustable period (e.g., 1500pF → ~236ms) |
| 6 - CSRT | Reset Timeout Adjust | Connected to OUT1 for D4 (200ms) fixed timeout; capacitor-based adjustment supported |
| 7 - GND | Ground Reference | Primary analog/digital ground; EP must be soldered to PCB ground plane for thermal management |
| 8 - RESET | Supervisory Reset Output | Push-pull active-low output; asserts during OUT1 undervoltage or watchdog fault; holds low for 200ms post-recovery |
| 9, 10 - WDS1, WDS0 | Watchdog Window Ratio Select | Set logic levels to select fast/slow watchdog window ratio (MAX6791-specific feature); both high disables watchdog |
| 11 - WDI | Watchdog Input | Accepts µP pulse train; transition required within tWD1/tWD2 window to prevent RESET assertion |
| 12 - HOLD | Regulator Hold Control | Active-low; forces OUT1 ON even if ENABLE1 goes low - enables self-holding ignition circuits without external components |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output; max 150mA; requires ≥10µF ceramic bypass to GND |
| 15 - ENABLE2 | OUT2 Enable Input | Active-high; internal 0.5µA pulldown allows direct µP GPIO control without pull-down resistor |
| 16 - PFI | Power-Fail Input | Resistive-divider input referenced to 1.231V internal threshold; 35µs propagation delay to PFO |
| 17, 18 - IN | Main Regulator Input | Accepts 5V–72V; bypass with 1µF ceramic capacitor to GND near pins for stability |
| 19 - GATEP | pFET Gate Driver | Drives external p-channel MOSFET gate for reverse-battery protection; eliminates series diode loss |
| 20 - ENABLE1 | OUT1 Enable Input | Active-high; internal 0.5µA pulldown enables direct µP control; pairs with HOLD for ignition sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs (ENABLE1/ENABLE2) | Allows separate power sequencing of OUT1 and OUT2 rails - essential for multi-voltage domain MCUs |
| HOLD self-holding function | Eliminates need for external latching circuitry in ignition-switched applications; reduces BOM count and layout area |
| Windowed watchdog timer (MAX6791) | Detects both too-fast and too-slow µP watchdog pulses - prevents false resets from jitter or frozen firmware |
| Reverse-battery protection via GATEP | Drives external pFET to block –12V reverse polarity; avoids 0.3–0.7V diode drop and associated heat generation |
| Thermal, short-circuit & overvoltage protection | Shuts down regulator at +165°C (20°C hysteresis); limits short-circuit current to 200–240mA; clamps output at 105–110% VOUT |
| AEC-Q100 qualified variants available | MAX6795TPLD2/V+ and MAX6795TPSD2/V+ meet automotive stress testing requirements - validates reliability for safety-critical use |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Camera ECU |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in vehicle door module with always-on wake-up capability. IC Role / Device Role / Timing Role: Dual-output regulator supplies 5V (OUT2) to CAN PHY and 3.3V (OUT1) to MCU core; RESET ensures deterministic boot after battery disconnect/reconnect. Use Value: 68μA quiescent current extends battery life during 10-year vehicle standby; HOLD enables ignition-triggered latching without external components. |
Use Scenario: Providing stable 5V and 3.3V rails to image sensor, ISP, and Ethernet PHY in front-facing ADAS camera under hood temperature extremes. IC Role / Device Role / Timing Role: OUT2 powers 5V sensor interface; OUT1 powers 3.3V ISP; watchdog monitors ISP firmware health; RESET initiates safe camera reboot on firmware hang. Use Value: 125°C rating and 2.7W thermal dissipation support continuous operation at +105°C ambient; windowed watchdog prevents spurious resets from sensor noise-induced timing jitter. |
| Engine Control Unit (ECU) Subsystem | Automotive Infotainment Power Management |
Use Scenario: Supplying auxiliary 5V rail to knock sensor amplifier and crankshaft position decoder in engine bay near exhaust manifold. IC Role / Device Role / Timing Role: OUT2 delivers clean 5V; PFI monitors pre-regulated 12V supply; PFO triggers graceful shutdown before main battery collapse. Use Value: 72V input range survives 40V load-dump spikes; 1.231V PFI threshold enables precise battery voltage monitoring with minimal external components. |
Use Scenario: Powering audio DSP and display controller in head unit with ignition-controlled startup and battery-backup retention mode. IC Role / Device Role / Timing Role: ENABLE1 driven by ignition signal; HOLD sustains OUT1 during key-off memory retention; RESET coordinates DSP reset with display controller power-up sequence. Use Value: Dual-enable + HOLD architecture replaces discrete latch + OR-gate solution; reduces footprint by >30% and improves startup timing predictability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive supervisory regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPTD4+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio configuration (WDS0/WDS1 mapping) | Same functional scope; selected when specific watchdog timing window ratios (e.g., 8:1, 16:1) are required | Drop-in replacement for MAX6791TPTD4+ where alternate watchdog window settings are needed |
| TLV70733PDQNR | Single-output, 300mA LDO only; no RESET, watchdog, PFI, HOLD, or dual-enable; 2.5V–5.5V input; not AEC-Q100 qualified | Limited to non-safety-critical, low-voltage subsystems without supervision or automotive qualification | Only suitable for cost-sensitive, non-automotive applications lacking supervisory features and high-voltage tolerance |
Compared with MAX6792TPTD4+, the MAX6791TPTD4+ offers identical regulation and supervision but with distinct default watchdog window settings; compared with TLV70733PDQNR, it provides full automotive-grade dual-rail power + supervision in one IC, eliminating need for discrete supervisors and enabling robust ECU-level power integrity.
Availability
MAX6791TPTD4+ is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera ECUs, engine control subsystems, and infotainment power management requiring stable component supply across extended temperature and high-reliability operating conditions.
Supply support for MAX6791TPTD4+ 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, communications, and automotive applications.
The MAX6791–MAX6796 family was developed specifically for automotive power management, integrating high-voltage LDO regulation, µP supervision, watchdog, power-fail detection, and reverse-battery protection into a single AEC-Q100-capable package.
FAQ
What output voltage options does the MAX6791TPTD4+ support?
The MAX6791TPTD4+ supports fixed-output voltages of 5V, 3.3V, 2.5V, or 1.8V on OUT1 (selected by SET1 connection), plus a fixed 5V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistive divider. The "D4" suffix confirms the 200ms reset timeout option, not output voltage - that is determined by the first placeholder in the part number (e.g., "T" = 3.3V, "L" = 5V).
How does the HOLD function operate in the MAX6791TPTD4+?
In the MAX6791TPTD4+, the HOLD input is active-low. When pulled low after initial power-up, it forces OUT1 to remain ON even if ENABLE1 is subsequently driven low - enabling self-holding ignition circuits. Releasing HOLD (to high or open) shuts down OUT1. HOLD is internally pulled up to OUT1 with a 2µA current source, so connecting it directly to OUT1 achieves automatic latching behavior without external components.
Is the MAX6791TPTD4+ AEC-Q100 qualified?
The MAX6791TPTD4+ itself is not explicitly listed as AEC-Q100 qualified in the datasheet; however, related variants like MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are AEC-Q100 qualified. The MAX6791TPTD4+ shares the same 20-pin TQFN-EP package, –40°C to +125°C operating range, and automotive-focused design (e.g., 72V input, load-dump tolerance, thermal protection), making it suitable for automotive applications pending system-level qualification.
What is the purpose of the GATEP pin on the MAX6791TPTD4+?
The GATEP pin on the MAX6791TPTD4+ drives the gate of an external p-channel MOSFET to implement reverse-battery protection. When battery polarity is reversed, the IC detects the condition and pulls GATEP low, turning off the pFET and blocking current flow - eliminating the power loss and heat generation of a series Schottky diode. This feature is critical for under-hood automotive modules exposed to service-related reverse connections.
Can the MAX6791TPTD4+ be used in single-output configurations?
Yes - although the MAX6791TPTD4+ is a dual-output device (OUT1 + fixed 5V OUT2), it can be used in single-output applications by leaving OUT2 unconnected or disabling it via ENABLE2. OUT1 remains fully functional with all supervision features (RESET, watchdog, PFI/PFO, HOLD). For dedicated single-output needs, Maxim offers the pin-compatible MAX6795/MAX6796 series, which provide up to 300mA on one rail without OUT2.
MAX6791TPTD4+ 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:
- 3.053V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPTD4+ FAQ
1.How can I place an order for MAX6791TPTD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPTD4+ 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 MAX6791TPTD4+ reliable?
The price and inventory of MAX6791TPTD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPTD4+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPTD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPTD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPTD4+?
MAX6791TPTD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPTD4+ 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 MAX6791TPTD4+?
For technical support, including MAX6791TPTD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPTD4+ requirements.
6.How does Aetrix verify that MAX6791TPTD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPTD4+ 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 MAX6791TPTD4+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPTD4+?
All MAX6791TPTD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPTD4+, 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 MAX6791TPTD4+ part is unused and in its original packaging.
Return procedure for MAX6791TPTD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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