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Analog Devices Inc./Maxim Integrated MAX6791TPWD3+T
- Part No.:
- MAX6791TPWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPWD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,670
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Product details
Overview
The MAX6791TPWD3+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 a 5V fixed OUT1 and 5V fixed OUT2, consumes only 68μA quiescent current, and includes a capacitor-adjustable 50ms reset timeout - enabling robust microcontroller supervision in load-dump-prone vehicle systems.
For engineers reviewing the MAX6791TPWD3+T datasheet, MAX6791TPWD3+T pinout, MAX6791TPWD3+T application, or MAX6791TPWD3+T equivalent, key selection considerations include its dual 5V outputs, 20-pin TQFN-EP package, -40°C to +125°C AEC-Q100-compatible operation, windowed watchdog capability (MAX6791 variant), and HOLD/ENABLE1/ENABLE2 independent control logic for ignition-synchronized self-holding circuits.
Technical Context
The MAX6791TPWD3+T implements two independent LDO regulators: OUT1 (adjustable or preset 5V) and OUT2 (fixed 5V), each rated for 150mA. Its supervisory block integrates a reset generator with 92.5% VOUT1 threshold and 50ms timeout (via CSRT = D3), plus a windowed watchdog timer with selectable fast/slow fault detection (WDS0/WDS1 configurable).
It supports reverse-battery protection via GATEP-driven pFET, thermal shutdown at +165°C with 20°C hysteresis, and power-fail monitoring through PFI/PFO with 1.231V reference. The HOLD input enables latch-up behavior without external components, while ENABLE1 and ENABLE2 allow independent regulation control - critical for multi-rail automotive subsystems requiring staged power sequencing.
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 meeting ISO 16750-2 sleep-current requirements. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient to power MCU cores, CAN transceivers, and sensor interfaces simultaneously. |
| Reset Timeout | 50ms (D3 option) - ensures reliable µP initialization after brownout recovery with no external timing capacitor. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation down to VIN = 5.84V when VOUT = 5V, supporting cold-crank operation. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for 2.7W dissipation, enabling continuous operation at high ambient temperatures. |
Pinout & Package
Package: 20-pin thermally enhanced TQFN-EP (5mm × 5mm), exposed pad connected to GND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Fixed 5V output (per MAX6791TPWD3+T ordering code), requires ≥10µF ceramic output capacitor for stability. |
| 3 - SET1 | Feedback Input | Connected to GND for preset 5V operation; used with external resistor divider for adjustable outputs (not active in this variant). |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal asserting when PFI falls below 1.231V - enables early battery-low warning. |
| 5 - CSWT | Watchdog Timeout Adjust | Connected to OUT1 for fixed 280ms watchdog timeout (standard on MAX6791); supports capacitor adjustment if needed. |
| 6 - CSRT | Reset Timeout Adjust | Connected to OUT1 to select D3 (50ms) reset timeout - eliminates need for external timing capacitor. |
| 7 - GND | Ground Reference | Primary analog/digital ground; exposed pad (EP) must be soldered to PCB ground plane for thermal and electrical integrity. |
| 8 - RESET | Supervisory Reset Output | Active-low push-pull output asserting when OUT1 drops below 4.625V (92.5% of 5V) and holding for 50ms post-recovery. |
| 9, 10 - WDS1, WDS0 | Windowed Watchdog Ratio Select | Configures fast/slow watchdog window ratio (e.g., 8×, 16×, 64×) - defines tWD1/tWD2 thresholds for fault discrimination. |
| 11 - WDI | Watchdog Input | Monitors µP pulse train; asserts RESET on missing edge (slow fault) or too-rapid edge (fast fault) per configured window. |
| 12 - HOLD | Regulator Hold Input | Active-low latch: forces OUT1 ON even after ENABLE1 goes low - enables ignition-key-triggered self-holding circuits. |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output (non-adjustable), independently regulated and capable of 150mA - provides isolated rail for peripherals. |
| 15 - ENABLE2 | Enable Input 2 | Active-high control for OUT2; internal 0.5µA pulldown allows direct connection to microcontroller GPIO without pull-down resistor. |
| 16 - PFI | Power-Fail Input | High-impedance comparator input referenced to 1.231V - used with resistive divider to set custom undervoltage warning threshold. |
| 17, 18 - IN | Main Supply Input | Accepts 5V–72V; requires 1µF ceramic bypass capacitor to GND close to pins for transient immunity. |
| 19 - GATEP | pFET Gate Driver | Drives external p-channel MOSFET gate for reverse-battery protection - eliminates series diode voltage drop and heat loss. |
| 20 - ENABLE1 | Enable Input 1 | Active-high control for OUT1; internal 0.5µA pulldown enables direct MCU interface - initiates regulator startup sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Discriminates between fast and slow µP hang conditions using WDS0/WDS1-selectable timing ratios - reduces false resets during valid software delays. |
| Self-Holding Circuit Support | HOLD input latches OUT1 ON after ENABLE1 activation - eliminates need for external latch IC or discrete transistor circuitry in ignition-switched systems. |
| Dual Independent 5V Outputs | OUT1 and OUT2 each deliver 150mA at fixed 5V with separate enable controls - enables power domain isolation for safety-critical and non-critical subsystems. |
| Reverse-Battery Protection Driver | GATEP output drives pFET gate directly - achieves <50mV forward drop vs. >300mV for Schottky diodes, improving efficiency and thermal margin. |
| Automotive-Grade Thermal Robustness | Thermal shutdown at +165°C with 20°C hysteresis and 2.7W package dissipation - sustains operation in engine compartment at 105°C ambient + 50°C self-heating. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering 32-bit MCU, CAN FD transceiver, and analog sensor front-end in gasoline/diesel engine bay. IC Role / Device Role / Timing Role: Dual 5V LDO regulator with reset supervision and watchdog monitoring - ensures deterministic boot and runtime fault detection. Use Value: 72V input tolerance survives 12V/24V system load dumps; 68μA quiescent current meets ISO 16750-2 Class D sleep requirements. |
Use Scenario: Supplying door module MCU, LIN transceiver, and LED driver ICs in passenger compartment. IC Role / Device Role / Timing Role: Dual-rail supervisor with HOLD-latched power-on and independent ENABLE2 control for accessory subsystems. Use Value: Self-holding behavior eliminates need for external latching hardware; PFI/PFO enables battery state-of-charge monitoring. |
| Advanced Driver Assistance Systems (ADAS) | Telematics Control Unit (TCU) |
|
Use Scenario: Providing clean 5V rails to radar processor, camera ISP, and safety monitor ASIC in front bumper assembly. IC Role / Device Role / Timing Role: High-reliability dual LDO with windowed watchdog - detects both software lockup and timing violations in ASIL-B functions. Use Value: -40°C to +125°C operation supports extended temperature range; thermal shutdown prevents field failure during prolonged high-load operation. |
Use Scenario: Powering cellular modem, GNSS receiver, and secure element in vehicle connectivity gateway. IC Role / Device Role / Timing Role: Supervised 5V regulator with power-fail warning and reverse-battery protection - ensures graceful shutdown during battery disconnect. Use Value: GATEP-driven pFET replaces lossy series diode; PFO signal triggers firmware-initiated data save before power loss. |
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 |
|---|---|---|---|
| MAX6792TPWD3+T | Same pinout and specs, but includes programmable windowed watchdog with wider ratio options (including 64×) and higher accuracy SET1 threshold (±0.5% vs ±1.2%). | Preferred for ASIL-B/C systems requiring tighter watchdog timing tolerance and enhanced fault discrimination. | Select MAX6792TPWD3+T when higher watchdog precision and extended window ratio flexibility are required; otherwise MAX6791TPWD3+T offers cost-optimized functionality. |
| TLV70733PDQNR | Single 3.3V output, 300mA, 5.5V max input, no watchdog/reset, SOT-23-5 package - lacks high-voltage capability, supervision, and dual-rail support. | Suitable only for low-voltage, non-automotive, non-safety-critical applications with simple enable control. | Not a functional replacement; consider only for non-automotive designs with ≤5.5V supply and no supervision needs. |
Compared with MAX6792TPWD3+T, the MAX6791TPWD3+T provides identical dual 5V regulation, HOLD/ENABLE architecture, and thermal protection but with reduced watchdog ratio granularity - making it ideal for cost-sensitive automotive modules where basic windowed supervision suffices.
Availability
MAX6791TPWD3+T is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS sensors, and telematics gateways requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX6791TPWD3+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 family was engineered specifically for automotive power-supply supervision - integrating dual LDO regulation, windowed watchdog, HOLD latching, and reverse-battery protection into a single AEC-Q100-qualified package.
FAQ
What output voltages does the MAX6791TPWD3+T provide?
The MAX6791TPWD3+T provides two fixed 5V outputs: OUT1 (pins 1–2) and OUT2 (pins 13–14), each capable of delivering up to 150mA. Its ordering code "D3" confirms the 5V preset for both outputs and the 50ms reset timeout configuration. No external feedback components are required for these outputs, simplifying layout and reducing BOM count.
How does the HOLD function work on the MAX6791TPWD3+T?
The HOLD input on the MAX6791TPWD3+T is an active-low signal that latches the regulator ON after initial enable. When ENABLE1 is driven high to start OUT1, pulling HOLD low thereafter keeps OUT1 active even if ENABLE1 returns low - enabling ignition-key-triggered self-holding without external components. Releasing HOLD shuts down OUT1, providing fail-safe control.
Is the MAX6791TPWD3+T qualified for automotive use?
Yes, the MAX6791TPWD3+T is AEC-Q100 qualified and specified for -40°C to +125°C operation. It meets automotive reliability standards including load-dump survival (72V input), reverse-battery protection (via GATEP), and thermal shutdown with hysteresis - making it suitable for under-hood and chassis-mounted electronic control units.
What is the purpose of the WDS0 and WDS1 pins on the MAX6791TPWD3+T?
WDS0 and WDS1 on the MAX6791TPWD3+T configure the windowed watchdog timer's fast/slow fault detection ratio. They select timing multipliers (e.g., 8×, 16×, 64×) that define tWD1 (fast fault) and tWD2 (slow fault) thresholds relative to the base watchdog period. This allows discrimination between valid software delays and true µP hangs - a key feature for ASIL-compliant systems.
Can the MAX6791TPWD3+T drive a p-channel MOSFET for reverse-battery protection?
Yes, the MAX6791TPWD3+T includes a dedicated GATEP output (pin 19) designed to drive the gate of an external p-channel MOSFET. This provides low-drop reverse-battery protection - eliminating the power loss and heat generation of traditional series diodes. GATEP delivers sufficient drive strength and voltage swing to fully enhance common automotive pFETs.
MAX6791TPWD3+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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPWD3+T FAQ
1.How can I place an order for MAX6791TPWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPWD3+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 MAX6791TPWD3+T reliable?
The price and inventory of MAX6791TPWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPWD3+T?
MAX6791TPWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPWD3+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 MAX6791TPWD3+T?
For technical support, including MAX6791TPWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPWD3+T requirements.
6.How does Aetrix verify that MAX6791TPWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPWD3+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 MAX6791TPWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPWD3+T?
All MAX6791TPWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPWD3+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 MAX6791TPWD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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