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Analog Devices Inc./Maxim Integrated MAX6791TPSD0+
- Part No.:
- MAX6791TPSD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD0+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,017
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Product details
Overview
The MAX6791TPSD0+ 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, consumes only 68μA quiescent current, and features fixed 5V/3.3V output options - used in engine control units (ECUs) and body electronics requiring robust load-dump tolerance.
For engineers reviewing the MAX6791TPSD0+ datasheet, MAX6791TPSD0+ pinout, MAX6791TPSD0+ application, or MAX6791TPSD0+ equivalent, key selection criteria include its dual-enable architecture (ENABLE1/ENABLE2), HOLD self-holding functionality, windowed watchdog timer (MAX6791-specific), and AEC-Q100-compliant thermal performance across −40°C to +125°C.
Technical Context
The MAX6791TPSD0+ implements two independent LDO regulators: OUT1 is adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V); OUT2 is fixed 5V. Its RESET output asserts low when OUT1 drops below 92.5% of nominal voltage and remains low for a fixed 35μs timeout period (D0 variant).
It integrates a windowed watchdog timer with selectable fast/slow fault detection (tWD1/tWD2), disableable via WDS0/WDS1 logic inputs, and includes reverse-battery protection via GATEP-driven pFET control - all operating within a single 20-pin TQFN-EP package rated for continuous 2.7W dissipation at high ambient temperatures.
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 ECU modules with ultra-low standby power. |
| Output Current | 150mA per output (OUT1/OUT2) - sufficient for microcontroller core + peripheral rail in compact ECUs. |
| Dropout Voltage | 840mV typical at 100mA (dual mode) - maintains regulation during cold-crank battery dips down to ~6V. |
| Reset Timeout | 35μs fixed (D0 option) - ensures rapid system reset recovery after brownout events. |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive deployment. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for 2.7W continuous dissipation. |
Pinout & Package
MAX6791TPSD0+ uses a 20-pin thermally enhanced TQFN-EP (5mm × 5mm) with exposed pad (EP) connected internally to GND. The package supports PCB-level thermal management via direct EP-to-ground-plane soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Dual-output regulator main output: preset 3.3V (per S-code in part number) or adjustable 1.8V–11V; requires ≥10μF output capacitor. |
| 3 | SET1 | Feedback input for OUT1; grounded for preset voltage, connected to resistive divider for adjustable operation. |
| 4 | PFO | Active-low open-drain power-fail output - asserts when PFI falls below 1.231V threshold (e.g., battery sag detection). |
| 5 | CSWT | Watchdog timeout adjust input - tied to OUT1 for fixed 280ms timeout (standard configuration). |
| 6 | CSRT | Reset timeout adjust input - tied to OUT1 for fixed 35μs timeout (D0 variant). |
| 7 | GND | Analog/digital ground reference and primary return path for all internal circuits. |
| 8 | RESET | Active-low reset output - push-pull or open-drain; asserts when OUT1 < 92.5% nominal and holds for D0 timeout. |
| 9, 10 | WDS1, WDS0 | Windowed watchdog ratio select inputs - configure fast/slow fault windows or disable watchdog (MAX6791-specific). |
| 11 | WDI | Watchdog input - rising/falling edge must occur within tWD2 (280ms min) to prevent reset assertion. |
| 12 | HOLD | Active-low hold input - forces OUT1 ON even after ENABLE1 goes low; enables self-holding ignition circuits. |
| 13, 14 | OUT2 | Fixed 5V secondary output - supplies auxiliary loads (e.g., CAN transceivers, sensors) independently of OUT1. |
| 15 | ENABLE2 | Active-high enable for OUT2 - allows independent control of 5V rail (e.g., sleep/wake sequencing). |
| 16 | PFI | Power-fail comparator input - set via external resistor divider to monitor battery or pre-regulated supply voltage. |
| 17, 18 | IN | Main regulator input - accepts 5V–72V; bypassed with ≥1μF ceramic capacitor to GND. |
| 19 | GATEP | pFET gate drive output - controls external p-channel MOSFET for reverse-battery protection (no diode drop). |
| 20 | ENABLE1 | Active-high enable for OUT1 - internally pulled down (0.5μA sink); initiates regulator startup on ignition signal. |
| EP | Exposed Pad | Internally connected to GND - must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables detection of both stuck-high and stuck-low WDI faults (tWD1/tWD2 thresholds), preventing false resets in noisy automotive environments. |
| Self-Holding Circuit Support | HOLD input eliminates need for external latching circuitry - regulator stays ON after ignition key release until HOLD is released. |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate sequencing of OUT1 (e.g., MCU core) and OUT2 (e.g., I/O peripherals), reducing system power-up glitches. |
| Reverse-Battery Protection | GATEP drives external pFET to block −12V reverse polarity - avoids 0.7V diode drop and associated heat generation. |
| Thermal & Overvoltage Protection | Integrated shutdown at +165°C (20°C hysteresis) and 105–110% overvoltage clamp - prevents damage during fault conditions. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit microcontroller core (OUT1 = 3.3V) and CAN transceiver (OUT2 = 5V) in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Dual-output LDO with integrated reset/watchdog provides primary power regulation and fail-safe supervision for real-time engine timing control. Use Value: 72V input tolerance survives ISO 7637-2 pulse 5a load-dump; 68μA quiescent current meets OEM off-state leakage budgets (<100μA). |
Use Scenario: Supplies door module MCU and LIN transceiver in vehicle access systems with wake-on-LIN capability. IC Role / Device Role / Timing Role: HOLD-enabled regulator sustains power during key-off transitions while enabling controlled shutdown via PFI-monitored battery voltage. Use Value: Self-holding eliminates external latch IC; PFI/PFO interface allows software-controlled graceful shutdown before deep discharge. |
| Advanced Driver Assistance Systems (ADAS) | Telematics Control Unit (TCU) |
Use Scenario: Powers vision processor and radar sensor interface in front-camera ADAS domain controller. IC Role / Device Role / Timing Role: Dual-rail regulation (3.3V/5V) with synchronized RESET ensures deterministic boot sequence across heterogeneous SoC subsystems. Use Value: Fixed 35μs reset timeout (D0) guarantees sub-100μs system recovery after transient brownouts on 12V bus. |
Use Scenario: Regulates LTE modem, GNSS receiver, and eSIM power rails in cellular-connected vehicle telematics units. IC Role / Device Role / Timing Role: Windowed watchdog monitors host processor health; GATEP-driven reverse protection secures against jump-start polarity errors. Use Value: 280ms watchdog timeout (CSWT = OUT1) aligns with modem firmware watchdog requirements; AEC-Q100 qualification ensures field reliability. |
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 |
|---|---|---|---|
| MAX6792TPSD0+ | Same pinout and features, but includes programmable window ratio (8×/16×/64×) for tighter watchdog fault discrimination. | Better suited for safety-critical ADAS where fast/slow fault differentiation improves diagnostic coverage. | Select MAX6792TPSD0+ when enhanced watchdog granularity is required; otherwise MAX6791TPSD0+ offers cost-optimized baseline functionality. |
| TLV70733PDQNR | Single 3.3V output, 200mA, 5.5V max input, no watchdog/reset, SOT-23-5 package. | Lacks automotive-grade input range, supervision, dual outputs, and thermal rating - limited to non-critical infotainment peripherals. | Only consider TLV70733PDQNR for cost-sensitive, low-voltage, non-safety subsystems where MAX6791TPSD0+ features are unnecessary. |
Compared with MAX6792TPSD0+, the MAX6791TPSD0+ provides identical dual-rail regulation and HOLD functionality at lower complexity and cost, while TLV70733PDQNR lacks the 5V–72V range, supervision, and AEC-Q100 compliance needed for primary ECU power domains.
Availability
MAX6791TPSD0+ is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS domain controllers, and telematics units requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPSD0+ 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 MAX6791TPSD0+ belongs to the MAX6791–MAX6796 family of high-voltage micropower regulators with integrated supervision - engineered specifically for automotive subsystems needing robust power sequencing, fault monitoring, and load-dump resilience.
FAQ
What output voltage does the MAX6791TPSD0+ deliver on OUT1?
The MAX6791TPSD0+ delivers a fixed 3.3V output on OUT1, as indicated by the 'S' in the part number suffix (TPSD0+). This is confirmed in the Ordering Information table and Electrical Characteristics section, where 'S' corresponds to 3.3V nominal output with ±2.5% tolerance over temperature and load. The device also supports adjustable operation via SET1 if configured externally.
Does the MAX6791TPSD0+ support reverse-battery protection?
Yes, the MAX6791TPSD0+ 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 series diode solutions, and is explicitly documented in the Reverse-Battery Protection Circuitry section of the datasheet.
What is the function of the HOLD pin on the MAX6791TPSD0+?
The HOLD pin on the MAX6791TPSD0+ is an active-low input that enables self-holding behavior: once OUT1 is enabled via ENABLE1, pulling HOLD low keeps the regulator ON even if ENABLE1 subsequently goes low. Releasing HOLD shuts down OUT1. This feature allows ignition-key-triggered power sequencing without external latching components, and is validated in the Enable and Hold Inputs section and Table 3 of the datasheet.
Is the MAX6791TPSD0+ AEC-Q100 qualified?
The MAX6791TPSD0+ is not explicitly listed as AEC-Q100 qualified in the provided documentation. While the MAX6795TPLD2/V+ and MAX6795TPSD2/V+ variants carry /V+ suffix denoting automotive qualification, the MAX6791TPSD0+ lacks the /V+ suffix and is specified only for −40°C to +125°C operation without formal AEC-Q100 test reporting. Customers requiring certified automotive grade should verify qualification status directly with Analog Devices.
How is the reset timeout period configured on the MAX6791TPSD0+?
The MAX6791TPSD0+ uses the D0 option, which configures a fixed 35μs reset timeout period. This is set by tying the CSRT pin to OUT1 (as shown in Typical Application Circuit), selecting the shortest factory-programmed timeout. The value is guaranteed across temperature and process variation, and appears in the Reset Timeout Period table under "D0" row with 35μs nominal value.
MAX6791TPSD0+ 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:
- 2.888V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35µs Typical
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPSD0+ FAQ
1.How can I place an order for MAX6791TPSD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD0+ 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 MAX6791TPSD0+ reliable?
The price and inventory of MAX6791TPSD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD0+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD0+?
MAX6791TPSD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD0+ 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 MAX6791TPSD0+?
For technical support, including MAX6791TPSD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD0+ requirements.
6.How does Aetrix verify that MAX6791TPSD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD0+ 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 MAX6791TPSD0+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD0+?
All MAX6791TPSD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD0+, 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 MAX6791TPSD0+ part is unused and in its original packaging.
Return procedure for MAX6791TPSD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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