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Analog Devices Inc./Maxim Integrated MAX6791TPLD3+T
- Part No.:
- MAX6791TPLD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
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Product details
Overview
The MAX6791TPLD3+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 (OUT1 and OUT2), supports 5V to 72V input range, features fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V outputs, and includes a capacitor-adjustable 50ms reset timeout. It operates across –40°C to +125°C and is AEC-Q100 qualified for under-hood applications.
For engineers reviewing the MAX6791TPLD3+T datasheet, MAX6791TPLD3+T pinout, MAX6791TPLD3+T application, or MAX6791TPLD3+T equivalent, key selection criteria include its dual-regulator architecture with independent enable control, windowed watchdog capability (MAX6791 variant), HOLD self-latching function, low 68μA quiescent current, and thermally enhanced 5mm × 5mm TQFN package with exposed pad.
Technical Context
The MAX6791TPLD3+T implements two independent LDO regulators: OUT1 is adjustable or preset (here configured as 3.3V, per "S" in suffix), and OUT2 is fixed at 5V. Its supervisory block integrates a push-pull or open-drain RESET output with 87.5% reset threshold (per "D" in suffix) and 50ms timeout (per "D3"), plus a windowed watchdog timer with selectable fast/slow fault detection using WDS0/WDS1 inputs.
It uses internal current-sinking ENABLE1/ENABLE2 inputs (0.5μA pulldown) and an active-low HOLD input (2μA internal pullup to OUT1) to support ignition-controlled self-holding circuits. Reverse-battery protection is implemented via GATEP-driven pFET, eliminating external diodes while maintaining <420mV dropout at 100mA on OUT1.
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 systems with ultra-low standby power draw |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core + I/O rail or dual-sensor supply |
| Dropout Voltage | 420mV typ @ 100mA (OUT1) - maintains regulation during cold-crank battery dips |
| Reset Threshold | 87.5% of nominal OUT1 voltage - ensures reliable brownout detection for 3.3V system |
| Reset Timeout | 50ms (capacitor-adjustable D3 option) - meets automotive microcontroller reset timing requirements |
| Operating Temp | –40°C to +125°C - fully specified for engine compartment deployment |
Pinout & Package
Package: 20-pin thermally enhanced TQFN-EP (5mm × 5mm, 0.5mm pitch), exposed pad soldered to PCB ground plane for 2.7W thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Primary regulator output | Configured as 3.3V (S-option); supplies main MCU or sensor rail; requires ≥10μF ceramic output cap |
| 3 - SET1 | Feedback reference input | Grounded for preset 3.3V operation; connects to resistive divider for adjustable output |
| 4 - PFO | Power-fail comparator output | Open-drain active-low signal indicating input undervoltage (e.g., battery sag) |
| 5 - CSWT | Watchdog timeout adjust | Connected to OUT1 for fixed 280ms timeout; capacitor to GND enables adjustment |
| 6 - CSRT | Reset timeout adjust | Connected to OUT1 for fixed 50ms timeout (D3); capacitor to GND enables scaling |
| 7 - GND | Power and signal reference | Common return for all circuits; tied to exposed pad for thermal conduction |
| 8 - RESET | Supervisory reset output | Push-pull active-low output asserting when OUT1 drops below 3.053V (87.5% of 3.3V) |
| 9, 10 - WDS1, WDS0 | Windowed watchdog ratio select | Set watchdog window ratio (e.g., 8×, 16×, 64×) or disable watchdog entirely |
| 11 - WDI | Watchdog input | Monitors µP pulse train; asserts RESET if edge interval falls outside min/max window |
| 12 - HOLD | Regulator hold control | Active-low latching input enabling self-hold circuit without external components |
| 13, 14 - OUT2 | Secondary regulator output | Fixed 5V output; powers peripherals, CAN transceivers, or analog front-ends |
| 15 - ENABLE2 | OUT2 enable control | Active-high input with internal 0.5μA pulldown; allows independent sequencing of 5V rail |
| 16 - PFI | Power-fail comparator input | Resistive-divider input referenced to 1.231V internal threshold for custom undervoltage detection |
| 17, 18 - IN | Main input supply | Accepts 5–72V; bypassed with 1μF ceramic capacitor to GND near pins |
| 19 - GATEP | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection (no series diode loss) |
| 20 - ENABLE1 | OUT1 enable control | Active-high input with internal 0.5μA pulldown; controls primary 3.3V rail independently |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables separate power domains: 3.3V MCU core + 5V peripheral rail with independent enable/sequencing |
| Windowed watchdog timer | Detects both stuck (slow) and overly frequent (fast) µP watchdog pulses - prevents silent firmware lockup |
| HOLD self-latching function | Eliminates need for external latch circuitry; sustains OUT1 after ignition switch release until HOLD released |
| Reverse-battery protection drive | GATEP output directly drives pFET gate - achieves <100mV forward drop vs. >400mV diode solution |
| AEC-Q100 qualification | Validated for automotive Grade 0 (–40°C to +125°C) operation with full reliability stress testing |
| Capacitor-adjustable timeouts | CSRT and CSWT pins allow precise tuning of reset and watchdog periods without changing IC variant |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powering 32-bit MCU, CAN controller, and sensor interface in gasoline/diesel ECU under wide battery voltage swing (6V–16V) and load-dump events (up to 72V). IC Role / Device Role / Timing Role: Dual-output regulator providing isolated 3.3V (MCU core) and 5V (CAN PHY, analog sensors) rails with synchronized reset and watchdog supervision. Use Value: 68μA quiescent current extends battery life in key-off monitoring; HOLD function enables wake-on-CAN without external latches. | Use Scenario: Supplying vision processor, radar SoC, and camera modules in front-facing ADAS camera module mounted near windshield. IC Role / Device Role / Timing Role: Primary power supervisor delivering regulated 3.3V and 5V with windowed watchdog to detect image processing thread hangs or sensor data freeze. Use Value: 50ms reset timeout ensures deterministic recovery before safety state escalation; thermal shutdown at +165°C protects against sun-load derating. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Managing power to door module microcontrollers, LIN transceivers, and LED drivers in centralized BCM with ignition-switched input. IC Role / Device Role / Timing Role: Regulator with HOLD input latched by ignition signal, enabling persistent 3.3V rail for memory retention and wake-up logic after key removal. Use Value: Self-holding eliminates need for discrete flip-flop or microcontroller GPIO hold circuit - reduces BOM count and layout area. | Use Scenario: Providing clean, supervised 3.3V and 5V rails to application processor, audio codec, and display interface in automotive infotainment system. IC Role / Device Role / Timing Role: Dual LDO with PFI input monitoring pre-regulated DC/DC output to trigger orderly software shutdown before brownout. Use Value: Adjustable PFI threshold (via resistor divider) allows precise detection of DC/DC failure at 10.5V, matching OEM battery cutoff spec. |
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 |
|---|---|---|---|
| MAX6792TPLD3+T | Same pinout and features, but includes windowed watchdog with faster minimum timeout (4.68ms vs. 6.25ms at 64× ratio) | Better suited for real-time safety-critical subsystems requiring tighter fault detection windows | Select MAX6792TPLD3+T when fast watchdog response (<5ms) is required for ASIL-B compliance paths |
| TPS7B8733QDDARQ1 | Single 3.3V output (300mA), no second output or windowed watchdog; fixed 200ms reset timeout | Lacks dual-rail capability and programmable reset/watchdog timing; simpler integration for non-redundant designs | Choose TPS7B8733QDDARQ1 for cost-sensitive single-rail applications where 5V auxiliary rail is supplied separately |
Compared with MAX6792TPLD3+T, the MAX6791TPLD3+T offers identical dual-output architecture and HOLD functionality but slightly longer minimum watchdog timeout - suitable for general-purpose ECUs. Versus TPS7B8733QDDARQ1, the MAX6791TPLD3+T provides greater flexibility with dual rails, adjustable timeouts, and windowed supervision at higher system integration cost.
Availability
The MAX6791TPLD3+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 MAX6791TPLD3+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 MAX6791–MAX6796 product line was engineered specifically for automotive power-supply supervision - integrating high-input-voltage LDOs, windowed watchdogs, HOLD latching, and reverse-battery protection into a single AEC-Q100-qualified package.
FAQ
What output voltage is configured for the MAX6791TPLD3+T?
The MAX6791TPLD3+T is configured with a 3.3V preset output on OUT1 (indicated by "S" in the ordering code) and a fixed 5V output on OUT2. The "D" denotes 87.5% reset threshold relative to OUT1, and "D3" specifies a 50ms reset timeout period. This configuration is factory-trimmed and does not require external feedback resistors for 3.3V operation.
Does the MAX6791TPLD3+T support reverse-battery protection?
Yes, the MAX6791TPLD3+T supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When reverse polarity is applied, the internal circuitry disables GATEP output, blocking current flow. This eliminates the power loss and heat generation associated with traditional series diode protection - critical for high-efficiency automotive designs.
How does the HOLD function operate in the MAX6791TPLD3+T?
The HOLD input in the MAX6791TPLD3+T is an active-low signal that, when pulled low after initial regulator enable, forces OUT1 to remain ON even if ENABLE1 returns low. This creates a self-holding circuit without external components. To shut down OUT1, HOLD must be released (driven high or left floating) while ENABLE1 is low. HOLD is internally pulled up to OUT1 with 2μA current.
Can the reset timeout period of the MAX6791TPLD3+T be adjusted?
Yes, the reset timeout period of the MAX6791TPLD3+T is adjustable via the CSRT pin. By default, connecting CSRT to OUT1 selects the factory-programmed 50ms timeout (D3). To adjust, connect a capacitor from CSRT to GND - timeout scales linearly with capacitance (e.g., 100nF yields ~5ms, 1μF yields ~50ms), enabling precise tailoring to system µP reset requirements.
Is the MAX6791TPLD3+T qualified for automotive use?
Yes, the MAX6791TPLD3+T is AEC-Q100 qualified for automotive applications. It is specified over the full –40°C to +125°C junction temperature range, includes thermal shutdown (+165°C) with 20°C hysteresis, and undergoes rigorous stress testing for humidity, vibration, and ESD robustness - meeting requirements for under-hood and cabin-mounted electronic control units.
MAX6791TPLD3+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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPLD3+T FAQ
1.How can I place an order for MAX6791TPLD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD3+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 MAX6791TPLD3+T reliable?
The price and inventory of MAX6791TPLD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD3+T?
MAX6791TPLD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD3+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 MAX6791TPLD3+T?
For technical support, including MAX6791TPLD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD3+T requirements.
6.How does Aetrix verify that MAX6791TPLD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD3+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 MAX6791TPLD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD3+T?
All MAX6791TPLD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD3+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 MAX6791TPLD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPLD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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