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Analog Devices Inc./Maxim Integrated MAX6791TPWD0+T
- Part No.:
- MAX6791TPWD0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPWD0+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,458
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Product details
Overview
The MAX6791TPWD0+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/2.5V/1.8V or adjustable 1.8V–11V outputs, and includes RESET, watchdog, HOLD, and ENABLE1/ENABLE2 controls - used in engine control units (ECUs) and body electronics requiring robust brownout protection.
For engineers reviewing the MAX6791TPWD0+T datasheet, MAX6791TPWD0+T pinout, MAX6791TPWD0+T application, or MAX6791TPWD0+T equivalent, key selection criteria include its dual 150mA outputs, 20-pin TQFN-EP package, -40°C to +125°C AEC-Q100-compatible operation, windowed watchdog timer (MAX6791-specific), and fixed 5V/3.3V output configuration indicated by "WD0" suffix.
Technical Context
The MAX6791TPWD0+T implements two independent LDO regulators: OUT1 (adjustable or preset) and OUT2 (fixed 5V), each with dedicated enable inputs (ENABLE1, ENABLE2) and shared HOLD functionality. Its supervisory block integrates a windowed watchdog timer (tWD1 = 50ms min / tWD2 = 280ms min), capacitor-adjustable reset timeout (CSRT), and PFI/PFO comparator for battery voltage monitoring.
It uses internal 1.231V reference for PFI threshold and 124mV/62mV SET/SET1 thresholds for Dual-Mode™ feedback, supports reverse-battery protection via GATEP-driven pFET, and incorporates thermal shutdown (+165°C), short-circuit current limiting (200–240mA), and output overvoltage protection (105–110% VOUT).
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 loss. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for microcontroller core + peripheral rail in compact ECUs. |
| Dropout Voltage | 840mV typ at 100mA (dual) - ensures regulation down to VIN ≈ 5.84V for 5V OUT2 under full load. |
| Reset Threshold | 92.5% of OUT1 nominal (e.g., 4.625V for 5V output) - provides precise brownout detection before MCU malfunction. |
| Watchdog Timeout | Windowed: 50ms (fast) / 280ms (slow) - detects both stuck and excessively slow µP clock signals. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
Pinout & Package
MAX6791TPWD0+T is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package (exposed pad connected to GND), rated for 2.7W continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Fixed 5V or 3.3V (per "WD0" suffix); requires ≥10µF ceramic output capacitor for stability. |
| 3 - SET1 | Feedback Input | Grounded for preset output; connects to resistive divider for adjustable 1.8V–11V operation. |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal asserting when PFI falls below 1.231V - used for early battery low warning. |
| 5 - CSWT | Watchdog Timeout Adjust | Connected to OUT1 for fixed 280ms timeout; capacitor-to-GND enables adjustable period (e.g., 1500pF → 236ms). |
| 6 - CSRT | Reset Timeout Adjust | Connected to OUT1 for fixed 50ms timeout (D3 code); capacitor sets custom delay (e.g., 0.1µF → ~10ms). |
| 7 - GND | Ground Reference | Primary analog/digital return; exposed pad (EP) must be soldered to PCB ground plane for thermal performance. |
| 8 - RESET | Supervisory Reset Output | Active-low push-pull output; asserts during OUT1 undervoltage or watchdog fault, holds low for 50ms after recovery. |
| 9, 10 - WDS1, WDS0 | Watchdog Window Ratio Select | Set to logic states per Table 4; "WD0" indicates WDS1=low, WDS0=low → 50ms/280ms window ratio. |
| 11 - WDI | Watchdog Input | Accepts µP toggle signal; violation of fast/slow window triggers RESET assertion for full timeout period. |
| 12 - HOLD | Regulator Hold Control | Active-low; forces OUT1/OUT2 ON even after ENABLE1/ENABLE2 goes low - enables self-holding ignition circuits. |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output (non-adjustable); supplies secondary MCU peripherals or sensors independently of OUT1. |
| 15 - ENABLE2 | OUT2 Enable Input | Active-high; internally pulled down (0.5µA sink); controls OUT2 independently of OUT1 for staged power sequencing. |
| 16 - PFI | Power-Fail Input | Connects to resistor divider from battery; comparator trips at 1.231V reference - enables programmable undervoltage detection. |
| 17, 18 - IN | Main Input Supply | Accepts 5V–72V; bypassed with 1µF ceramic capacitor to GND near pins for transient immunity. |
| 19 - GATEP | pFET Gate Driver | Sinks current to drive external p-channel MOSFET - provides reverse-battery protection without series diode loss. |
| 20 - ENABLE1 | OUT1 Enable Input | Active-high; internally pulled down (0.5µA sink); primary ON/OFF control for main regulated rail. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Simultaneously monitors for µP lockup (slow WDI) and clock stall (fast WDI) - eliminates false resets from jittery timing. |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate sequencing of OUT1 and OUT2 - critical for multi-rail automotive MCUs with staggered startup. |
| HOLD-Controlled Self-Holding | Eliminates need for external latch circuitry - simplifies ignition-switched power architecture in body control modules. |
| Reverse-Battery Protection Drive | GATEP output drives pFET gate directly - achieves <50mΩ effective series resistance vs. >200mΩ Schottky solution, reducing heat and voltage drop. |
| Capacitor-Adjustable Supervisory Timers | CSRT and CSWT pins support precision timeout tuning (±15%) across temperature - replaces multiple fixed-timer ICs with one device. |
Applications
| Engine Control Unit (ECU) Power Management | Body Control Module (BCM) Sequencing |
|---|---|
|
Use Scenario: Powers 32-bit MCU core (OUT1) and CAN transceiver + LIN interface (OUT2) in gasoline/diesel engine ECU. IC Role / Device Role / Timing Role: Dual LDO + supervisor provides independent 5V/3.3V rails, brownout reset, and windowed watchdog for ASIL-B compliance. Use Value: 68μA IQ enables always-on wake-up capability; 72V input handles load-dump without TVS; HOLD enables ignition-triggered latching. |
Use Scenario: Supplies door module MCU, window motor driver, and interior lighting controller in centralized BCM. IC Role / Device Role / Timing Role: Regulates 5V sensor rail (OUT2) and 3.3V logic rail (OUT1), with PFI monitoring 12V battery health. Use Value: Adjustable PFI threshold allows configurable battery low warning; dual ENABLEs support software-controlled subsystem power gating. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Powers image signal processor and MIPI CSI-2 serializer in rear-view camera ECU mounted near bumper. IC Role / Device Role / Timing Role: Delivers clean 3.3V (OUT1) and 5V (OUT2) with low-noise PSRR (69dB @ 100Hz) and fast 180µs startup. Use Value: 5mm × 5mm TQFN fits tight space constraints; -40°C to +125°C rating survives under-hood thermal cycling. |
Use Scenario: Supplies torque sensor ASIC and steering angle resolver in EPS column-mounted control unit. IC Role / Device Role / Timing Role: Provides fault-tolerant 5V supply with RESET assertion on voltage sag and watchdog confirmation of sensor data integrity. Use Value: Thermal shutdown (+165°C) prevents latch-up during EPS motor surge events; GATEP-driven pFET blocks reverse battery during jump-start. |
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 |
|---|---|---|---|
| MAX6792TPWD0+T | Identical pinout, package, and electrical specs; differs only in factory-programmed watchdog window ratio (50ms/280ms same, but internal calibration tighter). | No functional difference in circuit design; suitable for designs requiring tighter watchdog tolerance per AEC-Q100 Grade 0. | Select MAX6792TPWD0+T if production requires certified ±5% watchdog timing accuracy over temperature. |
| TLV70733PDQNR | Single 300mA 3.3V LDO only; no watchdog, RESET, HOLD, or second output; max input 5.5V; IQ = 25μA. | Limited to low-voltage, non-supervised applications (e.g., infotainment USB port); cannot replace MAX6791TPWD0+T in high-voltage or safety-critical roles. | Use only for cost-sensitive, non-automotive 3.3V point-of-load where supervision and 72V input are unnecessary. |
Compared with MAX6792TPWD0+T, the MAX6791TPWD0+T offers identical functionality at lower test-grade cost; versus TLV70733PDQNR, it provides essential automotive-grade supervision, dual-rail capability, and 72V resilience - making it irreplaceable in ECU/BCM designs.
Availability
MAX6791TPWD0+T is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering systems requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPWD0+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 systems needing high-input-voltage regulation, ultra-low quiescent current, and integrated functional safety supervision - specifically engineered for ECU, BCM, and ADAS subsystems.
FAQ
What output voltage options does the MAX6791TPWD0+T support?
The MAX6791TPWD0+T supports fixed 5V and 3.3V outputs on OUT1 and OUT2 respectively, as indicated by the "WD0" suffix per Maxim's ordering guide. OUT1 can also be configured as adjustable (1.8V–11V) by connecting SET1 to an external resistor divider. OUT2 is fixed at 5V and not adjustable. The device does not support 2.5V or 1.8V preset outputs in this specific variant.
How does the HOLD function operate in the MAX6791TPWD0+T?
In the MAX6791TPWD0+T, the HOLD pin is active-low. When driven low after initial power-up, it forces OUT1 and OUT2 to remain enabled even if ENABLE1 or ENABLE2 is subsequently pulled low - enabling self-holding ignition circuits without external components. Releasing HOLD (to high or open) shuts down both outputs. HOLD is internally pulled up to OUT1 with a 2µA current source.
What is the meaning of "WD0" in MAX6791TPWD0+T?
The "WD0" in MAX6791TPWD0+T denotes the watchdog window ratio configuration: WDS1 = low, WDS0 = low, selecting a 50ms fast timeout and 280ms slow timeout per the MAX6791 datasheet Table 4. It also confirms the device is a MAX6791 (dual-output) variant with preset 5V/3.3V outputs - distinguishing it from MAX6795 (single-output) or MAX6793 (dual-output with WD-DIS pin).
Does the MAX6791TPWD0+T include reverse-battery protection?
Yes, the MAX6791TPWD0+T integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, the internal circuitry disables GATEP output, blocking current flow. This eliminates the need for series Schottky diodes, reducing voltage drop and thermal stress compared to discrete solutions.
What package type and thermal performance does the MAX6791TPWD0+T offer?
The MAX6791TPWD0+T uses a 5mm × 5mm, 20-pin TQFN-EP package with exposed pad (EP) internally connected to GND. At TA = +70°C, it dissipates up to 2.7W continuously. Its thermal resistance θJA is optimized for PCBs with adequate copper area under the EP, supporting reliable operation in under-hood automotive environments up to +125°C junction temperature.
MAX6791TPWD0+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:
- 35µs Typical
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPWD0+T FAQ
1.How can I place an order for MAX6791TPWD0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPWD0+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 MAX6791TPWD0+T reliable?
The price and inventory of MAX6791TPWD0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPWD0+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPWD0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPWD0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPWD0+T?
MAX6791TPWD0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPWD0+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 MAX6791TPWD0+T?
For technical support, including MAX6791TPWD0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPWD0+T requirements.
6.How does Aetrix verify that MAX6791TPWD0+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPWD0+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 MAX6791TPWD0+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPWD0+T?
All MAX6791TPWD0+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPWD0+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 MAX6791TPWD0+T part is unused and in its original packaging.
Return procedure for MAX6791TPWD0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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