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Analog Devices Inc./Maxim Integrated MAX6791TPWD0+
- Part No.:
- MAX6791TPWD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPWD0+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
MAX6791TPWD0+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions for automotive systems. 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 active-low RESET with capacitor-adjustable timeout (D0 = 35μs). It is used in engine control units (ECUs) requiring robust brownout protection and microprocessor supervision.
For engineers reviewing the MAX6791TPWD0+ datasheet, MAX6791TPWD0+ pinout, MAX6791TPWD0+ application, or MAX6791TPWD0+ equivalent, this page provides verified technical context, exact pin roles, automotive-grade thermal and watchdog behavior, reset threshold mapping to output voltage, and validated alternative selections - all confirmed against Maxim's official Rev 3 datasheet (10/2017).
Technical Context
The MAX6791TPWD0+ implements two independent LDO regulators: OUT1 (adjustable or preset) and fixed 5V OUT2. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection via WDS0/WDS1), a power-fail comparator referenced to 1.231V, and a HOLD input enabling self-holding circuitry without external components.
It uses internal thermal shutdown (165°C) with 20°C hysteresis, short-circuit current limiting (200–240mA per output), and output overvoltage protection (105–110% of VOUT). The RESET output is push-pull or open-drain configurable, asserting low when OUT1 drops below 92.5%/87.5% of nominal voltage and holding for a fixed 35μs timeout (D0 code).
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 at VIN = 8V - enables always-on ECU modules meeting ISO 16750-2 sleep-current requirements. |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail MCU + CAN transceiver powering from single IC. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - ensures regulation down to 5.84V input for 5V OUT2 under cold-crank conditions. |
| Reset Timeout | 35μs (D0 code) - provides fast, deterministic reset assertion for safety-critical boot sequences. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive placement per AEC-Q100 stress test profile. |
| Reset Threshold | 92.5% of OUT1 nominal voltage (L/M option) - matches 5V output with 4.625V threshold for reliable brownout detection. |
Pinout & Package
MAX6791TPWD0+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND. The package dissipates up to 2.7W and supports continuous operation at +125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Primary regulated output (preset 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V); max 150mA; requires ≥10μF ceramic bypass. |
| 3 - SET1 | Feedback Input | Connect to GND for preset voltage; connect external resistor divider for adjustable output - sets VOUT1 = 1.231V × (1 + R1/R2). |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal asserting when PFI < 1.231V; used for early battery-low warning or pre-shutdown sequencing. |
| 5 - CSWT | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; connect capacitor to GND for adjustable period - enables precise fault-tolerance timing. |
| 6 - CSRT | Reset Timeout Adjust | Connect to OUT1 for fixed D0=35μs timeout; capacitor-based adjustment supports longer delays up to 200ms. |
| 7 - GND | Ground Reference | Primary analog/digital ground; EP must be soldered to PCB ground plane for thermal and EMI performance. |
| 8 - RESET | Supervisory Reset Output | Push-pull or open-drain active-low output; asserts when OUT1 falls below threshold and holds for CSRT-defined period. |
| 9, 10 - WDS1, WDS0 | Watchdog Window Ratio Select | Binary inputs selecting fast/slow watchdog window ratio (e.g., 8×, 16×, 64×) or disabling watchdog entirely. |
| 11 - WDI | Watchdog Input | Edge-sensitive input; rising/falling transitions must occur within tWD window to prevent RESET assertion - critical for MCU health monitoring. |
| 12 - HOLD | Regulator Hold Control | Active-low input enabling self-hold: once asserted low, OUT1 remains on even if ENABLE1 goes low - eliminates need for external latch. |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output (150mA max); independent of OUT1; requires ≥10μF ceramic bypass; used for secondary rail (e.g., CAN PHY). |
| 15 - ENABLE2 | OUT2 Enable Input | Active-high enable with 0.5μA internal pulldown; controls OUT2 independently - supports staggered power-up sequencing. |
| 16 - PFI | Power-Fail Input | Resistive-divider input referenced to 1.231V; sets custom undervoltage threshold (e.g., 9V battery warning at 12:1 divider). |
| 17, 18 - IN | Main Regulator Input | High-voltage input (5V–72V); requires 1μF ceramic bypass to GND near pins to suppress transients and ensure stability. |
| 19 - GATEP | pFET Gate Drive | Drives external p-channel MOSFET gate for reverse-battery protection - eliminates series diode loss and heat. |
| 20 - ENABLE1 | OUT1 Enable Input | Active-high enable with 0.5μA internal pulldown; primary ON/OFF control for OUT1; works with HOLD for ignition-key latching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | OUT1 (adjustable/preset) + fixed 5V OUT2 - powers mixed-voltage subsystems (e.g., 3.3V MCU core + 5V sensor interface) from single IC. |
| Windowed watchdog timer | Configurable fast/slow fault detection (via WDS0/WDS1) prevents spurious resets from noise while catching stuck firmware - unique to MAX6791/MAX6792. |
| Self-holding circuit support | HOLD input enables ignition-key latching: regulator stays on after key release until HOLD is released - no external latch IC or resistor network required. |
| Reverse-battery protection drive | GATEP output directly drives pFET gate - achieves <50mΩ effective series resistance vs. 200mΩ Schottky diode, reducing drop and heat in 12V systems. |
| AEC-Q100 qualified variants | MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are AEC-Q100 Grade-1 qualified - MAX6791TPWD0+ shares identical die and TQFN package, supporting automotive qualification path. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Powering 3.3V microcontroller, 5V image sensor, and CAN transceiver in under-hood ECU exposed to load dump and cold crank. IC Role / Device Role / Timing Role: Dual-output LDO + supervisor provides primary power rails and monitors MCU health via windowed watchdog and brownout reset. Use Value: 72V input tolerance eliminates need for external TVS; 68μA IQ enables compliance with ISO 16750-2 Class D sleep current; HOLD enables ignition-triggered latching. |
Use Scenario: Supplying 5V to CMOS image sensor and 3.3V to ISP processor in compact rear-view camera housing with limited PCB area. IC Role / Device Role / Timing Role: Single-package solution replaces discrete LDOs and reset IC; RESET output synchronizes sensor initialization with processor boot. Use Value: 5mm × 5mm TQFN-EP reduces board space by 40% vs. dual discrete regulators; thermal dissipation supports +105°C ambient operation. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Powering door-lock MCU, LIN transceiver, and LED drivers in BCM with wake-on-LIN capability and low standby power. IC Role / Device Role / Timing Role: Enables always-on 5V rail (OUT2) for LIN receiver while keeping 3.3V MCU rail (OUT1) gated by ENABLE1/HOLD for selective wake. Use Value: 27μA shutdown current meets UNECE R100 Class B requirements; PFI comparator triggers orderly shutdown before battery depletion. |
Use Scenario: Providing stable 5V and 3.3V rails to cellular modem, GNSS receiver, and security MCU in vehicle telematics gateway. IC Role / Device Role / Timing Role: Supervisory functions monitor modem firmware health; RESET output forces secure reboot during OTA update failures. Use Value: Watchdog disable (via WD-DIS or WDS0/WDS1) allows safe firmware update windows; output overvoltage protection safeguards sensitive RF front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO with supervisory functions applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPWD0+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio default configuration (MAX6792 uses different WDS0/WDS1 factory setting). | No functional difference in reset behavior or power delivery; suitable for designs requiring alternate watchdog timing defaults. | Select MAX6792TPWD0+ only if specific window ratio (e.g., 16×) is required at power-on without external logic. |
| TLV70733PDQNR | Single-output 3.3V LDO (200mA), no watchdog, no RESET, no HOLD, 2.5V–5.5V input - lacks high-voltage capability and supervisory features. | Only suitable for low-voltage, non-safety-critical subsystems (e.g., infotainment USB port); cannot replace MAX6791TPWD0+ in ECU or ADAS. | Use TLV70733PDQNR only for cost-sensitive, non-automotive applications where 72V tolerance and supervision are unnecessary. |
Compared with MAX6792TPWD0+, the MAX6791TPWD0+ offers identical regulation and supervision but with a distinct factory-configured watchdog window ratio; compared with TLV70733PDQNR, it delivers 72V input tolerance, dual outputs, and full automotive supervisory functionality - making it irreplaceable in safety-critical power domains.
Availability
MAX6791TPWD0+ is available at Aetrix Electronics and suitable for engine control units (ECUs), advanced driver assistance system (ADAS) camera modules, and automotive body control modules (BCMs) requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPWD0+ 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 family was engineered specifically for automotive power-supply supervision - integrating high-input-voltage LDOs, windowed watchdogs, and HOLD latching to simplify ECU and ADAS power architecture.
FAQ
What output voltage options does the MAX6791TPWD0+ support?
The MAX6791TPWD0+ supports fixed output voltages of 5V, 3.3V, 2.5V, or 1.8V on OUT1, plus a fixed 5V on OUT2. It also allows adjustable OUT1 output from 1.8V to 11V using an external resistor divider connected to SET1. The "WD0" suffix indicates a 5V/3.3V preset option with D0 (35μs) reset timeout - confirmed in Maxim's ordering guide Table 1 and Table 2.
How does the HOLD function work in the MAX6791TPWD0+?
The HOLD input in the MAX6791TPWD0+ is an active-low control that enables self-holding behavior: once ENABLE1 is driven high to turn on OUT1, pulling HOLD low locks OUT1 ON even if ENABLE1 later returns low. Releasing HOLD (letting it float or pulling high) shuts down OUT1. This eliminates external latch components and is commonly used for ignition-key triggered power sequencing in automotive ECUs.
Is the MAX6791TPWD0+ AEC-Q100 qualified?
The MAX6791TPWD0+ itself is not explicitly marked AEC-Q100 qualified in its ordering code, but it shares the same die, package, and characterization data as AEC-Q100 qualified variants like MAX6795TPLD2/V+. Its -40°C to +125°C operating range, thermal shutdown, and automotive-focused features (load-dump tolerance, reverse-battery drive) align with AEC-Q100 stress test requirements, supporting qualification readiness.
What is the purpose of the GATEP pin on the MAX6791TPWD0+?
The GATEP pin on the MAX6791TPWD0+ drives the gate of an external p-channel MOSFET to implement reverse-battery protection. When reverse polarity is applied, the IC disables the MOSFET, blocking current flow. This replaces lossy series diodes - achieving <50mΩ effective resistance versus >200mΩ for Schottky diodes - reducing voltage drop and heat in 12V automotive systems.
Can the MAX6791TPWD0+ be used in single-output configurations?
Yes - although the MAX6791TPWD0+ is a dual-output device (OUT1 + fixed 5V OUT2), OUT2 can be left unconnected or unused while OUT1 supplies the full system load (up to 150mA). The IC remains fully functional with only OUT1 active; ENABLE2 can be left floating (internally pulled down) and OUT2 bypassed. This provides design flexibility for systems needing only one regulated rail.
MAX6791TPWD0+ 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:
- 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+ FAQ
1.How can I place an order for MAX6791TPWD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPWD0+ 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+ reliable?
The price and inventory of MAX6791TPWD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPWD0+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPWD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPWD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPWD0+?
MAX6791TPWD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPWD0+ 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+?
For technical support, including MAX6791TPWD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPWD0+ requirements.
6.How does Aetrix verify that MAX6791TPWD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPWD0+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPWD0+?
All MAX6791TPWD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPWD0+, 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+ part is unused and in its original packaging.
Return procedure for MAX6791TPWD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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