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Analog Devices Inc./Maxim Integrated MAX6791TPZD4+T
- Part No.:
- MAX6791TPZD4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPZD4+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
The MAX6791TPZD4+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 200ms reset timeout (D4 option) - enabling robust brownout recovery in engine control units.
For engineers reviewing the MAX6791TPZD4+T datasheet, MAX6791TPZD4+T pinout, MAX6791TPZD4+T application, or MAX6791TPZD4+T equivalent, key selection considerations include its AEC-Q100-qualified TQFN-20 package, dual enable inputs (ENABLE1/ENABLE2), HOLD self-hold functionality, windowed watchdog capability (MAX6791 variant), and 92.5% reset threshold referenced to OUT1.
Technical Context
The MAX6791TPZD4+T implements two independent LDO regulators: OUT1 (adjustable or preset 5V) and OUT2 (fixed 5V), each rated for 150mA continuous output. Its supervisory block integrates a push-pull or open-drain RESET output with fixed 92.5% threshold (L-grade), 200ms timeout via CSRT = D4 configuration, and a windowed watchdog timer supporting fast/slow fault detection.
Control logic includes dual active-high enables (ENABLE1/ENABLE2), an active-low HOLD input that sustains regulation after ENABLE release, and WDS0/WDS1 pins selecting watchdog window ratios. The device uses internal 1.231V references for PFI comparator and SET1 feedback, with thermal shutdown at +165°C and overvoltage protection clamping OUT at 1.05×VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external protection circuitry |
| Quiescent Current | 68μA typical - enables always-on operation in battery-sensitive systems like telematics |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail MCU + CAN transceiver power domains |
| Reset Timeout | 200ms (D4 option) - ensures reliable microcontroller initialization after deep brownout recovery |
| Dropout Voltage | 840mV typ @ 100mA (dual mode) - maintains regulation down to VIN = 5.84V when VOUT = 5V |
| Operating Temp | −40°C to +125°C - fully specified for under-hood automotive environments |
| Reset Threshold | 92.5% of OUT1 nominal - provides precise 4.625V assertion point for 5V rail monitoring |
Pinout & Package
Package: 20-pin thermally enhanced TQFN-EP (5mm × 5mm, exposed pad), rated for 2.7W dissipation at TA = +70°C with 33.3mW/°C derating above.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Main regulated output (5V fixed for this variant); requires ≥10μF ceramic bypass to GND |
| 3 | SET1 | Feedback node for OUT1; grounded for 5V preset, connected to resistor divider for adjustable outputs |
| 4 | PFO | Open-drain power-fail output asserting low when PFI < 1.231V - used for early battery warning |
| 5 | CSWT | Watchdog timeout adjust input; tied to OUT1 for fixed 280ms timeout (not D4-configured) |
| 6 | CSRT | Reset timeout adjust input; configured as D4 (200ms) via internal resistor network per ordering code |
| 7 | GND | Analog/digital ground reference; must connect exposed pad (EP) to PCB ground plane |
| 8 | RESET | Active-low push-pull reset output; asserts for 200ms after OUT1 recovers from brownout |
| 9, 10 | WDS1, WDS0 | Windowed watchdog ratio select inputs; set to enable fast/slow fault detection per MAX6791 architecture |
| 11 | WDI | Watchdog input; requires edge transition within tWD2 (400ms max) to prevent reset assertion |
| 12 | HOLD | Active-low hold input; sustains OUT1/OUT2 regulation even after ENABLE1 goes low |
| 13, 14 | OUT2 | Secondary fixed 5V output; independent of OUT1 regulation state |
| 15 | ENABLE2 | Active-high enable for OUT2; internally pulled down (0.5μA sink) - requires logic-high drive |
| 16 | PFI | Power-fail comparator input; sets custom brownout threshold via external resistive divider |
| 17, 18 | IN | Main input supply pins; require 1μF ceramic bypass to GND near package |
| 19 | GATEP | pFET gate driver output; controls external p-channel MOSFET for reverse-battery protection |
| 20 | ENABLE1 | Active-high enable for OUT1; internally pulled down (0.5μA sink) - standard ignition-switch interface |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 5V outputs | Enables simultaneous powering of MCU core and I/O peripherals without cross-regulation coupling |
| Windowed watchdog timer | Detects both stuck-high and stuck-low WDI faults (tWD1/tWD2 windows), preventing silent firmware lockup |
| Self-holding circuit support | HOLD input eliminates need for external latch components in ignition-controlled power sequencing |
| Reverse-battery protection drive | GATEP output directly drives pFET gate, removing series diode losses and voltage drop |
| Automotive-grade thermal protection | +165°C shutdown with 20°C hysteresis ensures safe operation during under-hood temperature excursions |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers 5V microcontroller and CAN transceiver in gasoline/diesel ECU modules subjected to cold-crank (4.5V) and load-dump (72V) events. IC Role / Device Role / Timing Role: Dual 5V LDO regulator with integrated reset supervision and watchdog - replaces discrete supervisor + dual LDO solution. Use Value: 68μA quiescent current prevents battery drain during vehicle sleep mode; 72V tolerance eliminates need for upstream TVS clamping. | Use Scenario: Supplies vision processor and radar sensor interface in forward collision warning systems requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Dual-rail supervisor with HOLD-latched startup and windowed watchdog - ensures deterministic boot and runtime fault detection. Use Value: HOLD function sustains power during ignition transient dips; windowed watchdog catches both frozen and runaway firmware states. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) |
Use Scenario: Provides always-on 5V rail for GPS/GSM modem and real-time clock in cellular-connected vehicle tracking units. IC Role / Device Role / Timing Role: Micropower dual LDO with programmable reset timeout - manages low-power wake-up and brownout recovery. Use Value: 200ms D4 reset timeout guarantees full MCU initialization before firmware execution begins; 5V–72V range covers all battery chemistries. | Use Scenario: Powers door module microcontrollers and LIN transceivers in centralized body electronics with shared ignition-switched supply. IC Role / Device Role / Timing Role: Dual 5V regulator with independent ENABLE2 control - allows selective activation of lighting vs. window lift subsystems. Use Value: ENABLE2 pin enables software-controlled power gating of non-critical loads; PFI input monitors main battery health pre-ignition. |
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 |
|---|---|---|---|
| MAX6792TPZD4+T | Same pinout and electrical specs; differs only in watchdog window ratio programming (WDS0/WDS1 mapping) | Identical functional scope; selected when specific window timing ratios (e.g., 8:1) are required | Direct substitute if window ratio matches design requirements; verify WDS0/WDS1 strap configuration |
| TLV70733PDQNR | Single 3.3V output, 200mA, 5.5V max input, no watchdog/reset supervision, SOT-23-5 package | Limited to low-voltage, non-automotive applications without system-level supervision | Only suitable for cost-sensitive, non-safety-critical 3.3V point-of-load use - not a functional replacement |
Compared with MAX6792TPZD4+T, the MAX6791TPZD4+T offers identical regulation, reset, and watchdog performance but targets different window ratio configurations; TLV70733PDQNR lacks high-voltage capability, dual outputs, and supervisory features entirely - making it unsuitable for automotive power sequencing.
Availability
MAX6791TPZD4+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and telematics applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPZD4+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 delivers high-voltage, micropower linear regulators with integrated supervision specifically for automotive subsystems needing robust brownout recovery, watchdog safety, and reverse-battery protection.
FAQ
What output voltages does the MAX6791TPZD4+T support?
The MAX6791TPZD4+T provides two fixed 5V outputs: OUT1 and OUT2. Its SET1 pin is grounded per the Z-grade ordering code, disabling adjustable operation. Both outputs are guaranteed over −40°C to +125°C with ±2.5% accuracy at 150mA load, supporting dual-rail automotive MCUs and communication interfaces.
How is the 200ms reset timeout implemented in the MAX6791TPZD4+T?
The MAX6791TPZD4+T achieves its 200ms reset timeout (D4 option) via internal resistor calibration on the CSRT pin - no external capacitor required. This factory-trimmed timeout ensures consistent brownout recovery timing across temperature and voltage, eliminating layout sensitivity and capacitor aging effects found in RC-based solutions.
Does the MAX6791TPZD4+T support reverse-battery protection?
Yes, the MAX6791TPZD4+T includes dedicated GATEP output that drives the gate of an external p-channel MOSFET to block reverse current flow. When reverse battery is applied, GATEP pulls low to turn off the MOSFET, protecting downstream circuitry without diode voltage drop or power loss - critical for 12V automotive systems.
What is the purpose of the HOLD pin on the MAX6791TPZD4+T?
The HOLD pin on the MAX6791TPZD4+T enables self-holding behavior: once ENABLE1 turns on OUT1, pulling HOLD low sustains regulation even if ENABLE1 returns low. This eliminates external latching circuitry in ignition-switched applications, allowing the microcontroller to maintain power during key-off transitions until software-controlled shutdown.
Is the MAX6791TPZD4+T qualified for automotive use?
Yes, the MAX6791TPZD4+T is manufactured in an AEC-Q100 qualified process and specified for −40°C to +125°C operation. While not carrying the /V suffix (which denotes full AEC-Q100 test documentation), its design, characterization, and packaging meet automotive reliability requirements for engine bay and chassis-mounted modules.
MAX6791TPZD4+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:
- 2.313V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPZD4+T FAQ
1.How can I place an order for MAX6791TPZD4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPZD4+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 MAX6791TPZD4+T reliable?
The price and inventory of MAX6791TPZD4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPZD4+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPZD4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPZD4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPZD4+T?
MAX6791TPZD4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPZD4+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 MAX6791TPZD4+T?
For technical support, including MAX6791TPZD4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPZD4+T requirements.
6.How does Aetrix verify that MAX6791TPZD4+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPZD4+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 MAX6791TPZD4+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPZD4+T?
All MAX6791TPZD4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPZD4+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 MAX6791TPZD4+T part is unused and in its original packaging.
Return procedure for MAX6791TPZD4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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