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Analog Devices Inc./Maxim Integrated MAX6791TPLD2+
- Part No.:
- MAX6791TPLD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD2+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,673
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Product details
Overview
MAX6791TPLD2+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator designed for automotive power management. It delivers up to 150mA per output (OUT1 and OUT2), supports 5V to 72V input range, features fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 5V preset), and integrates RESET, watchdog, HOLD, and ENABLE1/ENABLE2 functions - deployed in engine control units and body electronics under load-dump conditions.
For engineers reviewing the MAX6791TPLD2+ datasheet, MAX6791TPLD2+ pinout, MAX6791TPLD2+ application, or MAX6791TPLD2+ equivalent, key selection criteria include its AEC-Q100-qualified 20-pin TQFN package, 68μA quiescent current, dual enable control, windowed watchdog capability (MAX6791-specific), and 5mm × 5mm thermally enhanced layout compatibility with high-ambient automotive environments.
Technical Context
The MAX6791TPLD2+ implements two independent LDO regulators: OUT1 (adjustable or preset 1.8V–5V) and fixed 5V OUT2, each with dedicated enable inputs (ENABLE1, ENABLE2) and shared supervisory logic. Its reset circuit asserts low when OUT1 drops below 92.5% of nominal voltage and holds for a capacitor-adjustable timeout (e.g., D2 = 12.5ms).
It features a windowed watchdog timer (selectable via WDS0/WDS1) that triggers RESET on both fast faults (tWDI < tWD1) and slow faults (tWDI > tWD2), with independent timeout periods (e.g., tWD1 = 25ms min at ratio 16). The HOLD input enables self-holding behavior without external components by latching ON state after initial enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without shutdown. |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive systems. |
| Output Current | 150mA per output (OUT1/OUT2) - sufficient for MCU cores, CAN transceivers, and sensors. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation during cold-crank (6V battery) with 5V OUT1. |
| Reset Threshold | 92.5% of OUT1 nominal - ensures reliable microcontroller reset before brownout. |
| Watchdog Type | Windowed (MIN/MAX) - detects both stuck and excessively slow microprocessor clock signals. |
| Operating Temp | −40°C to +125°C - fully specified for under-hood automotive placement. |
Pinout & Package
MAX6791TPLD2+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND. The package supports up to 2.7W continuous dissipation and is AEC-Q100 qualified for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Primary regulated output (preset 5V or adjustable 1.8V–11V); requires ≥10μF ceramic bypass to GND. |
| 3 - SET1 | OUT1 Feedback Input | Connect to GND for preset voltage; connect resistive divider for adjustable output configuration. |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal asserting when PFI falls below 1.231V threshold. |
| 5 - CSWT | Watchdog Timeout Adjust | Capacitor-to-GND sets adjustable watchdog period; tied to OUT1 for fixed 280ms timeout. |
| 6 - CSRT | Reset Timeout Adjust | Capacitor-to-GND sets adjustable reset timeout; tied to OUT1 for fixed D2 (12.5ms) period. |
| 7 - GND | Ground Reference | Common return for all circuits; EP must be soldered to PCB ground plane for thermal performance. |
| 8 - RESET | Supervisory Reset Output | Active-low push-pull or open-drain output synchronized to OUT1 voltage and watchdog events. |
| 9, 10 - WDS1, WDS0 | Watchdog Window Ratio Select | Digital inputs selecting MIN/MAX watchdog window ratio (e.g., 8:1, 16:1, 64:1) or disable. |
| 11 - WDI | Watchdog Input | Edge-sensitive input requiring valid rising/falling transitions within watchdog window to prevent RESET. |
| 12 - HOLD | Regulator Hold Control | Active-low input enabling self-holding: forces OUT1 ON even after ENABLE1 goes low. |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output (150mA max); requires ≥10μF ceramic bypass to GND. |
| 15 - ENABLE2 | OUT2 Enable Input | Active-high input controlling OUT2 independently; internally pulled down (0.5μA sink). |
| 16 - PFI | Power-Fail Input | Resistive-divider input referenced to 1.231V internal threshold for early battery-fail detection. |
| 17, 18 - IN | Main Regulator Input | High-voltage input (5V–72V); bypassed with ≥1μF ceramic capacitor to GND. |
| 19 - GATEP | pFET Gate Drive | Drives external p-channel MOSFET for reverse-battery protection (no series diode needed). |
| 20 - ENABLE1 | OUT1 Enable Input | Active-high input controlling OUT1; internally pulled down (0.5μA sink). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Quiescent Current | 68μA enables >10-year battery life in always-on automotive modules (e.g., telematics wake-up circuits). |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate sequencing and fault isolation for OUT1 and OUT2 rails. |
| Self-Holding Circuit Support | HOLD input eliminates need for external latch components in ignition-controlled power domains. |
| Windowed Watchdog Timer | Prevents system lockup from frozen or overclocked microcontrollers via dual-threshold timing detection. |
| Reverse-Battery Protection Drive | GATEP output directly drives pFET gate, removing series diode losses and improving efficiency. |
| Thermal & Overvoltage Protection | Integrated 165°C thermal shutdown with 20°C hysteresis and 105–110% VOUT overvoltage clamping. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit MCU core, CAN FD transceiver, and analog sensor interface in under-hood ECU exposed to 125°C ambient and 72V load-dump spikes. IC Role / Device Role / Timing Role: Dual-output LDO with integrated reset and watchdog serves as primary power supervisor and brownout guard. Use Value: 68μA IQ prevents battery drain during vehicle sleep; 72V input range avoids external TVS clamping; HOLD enables ignition-triggered latching without external logic. |
Use Scenario: Supplies 5V rail to door module microcontroller and 3.3V rail to LIN transceiver in passenger compartment BCM. IC Role / Device Role / Timing Role: Dual-regulator with independent ENABLE pins provides sequenced power-up and isolated fault response. Use Value: Adjustable OUT1 allows flexible 3.3V generation; PFI/PFO enables battery voltage monitoring for graceful shutdown before deep discharge. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Head Unit |
Use Scenario: Powers radar processor SoC and image signal processor in front radar ECU operating at −40°C to +105°C. IC Role / Device Role / Timing Role: High-temperature-stable LDO with windowed watchdog ensures deterministic restart after transient faults. Use Value: 125°C rating and ±1.5% load regulation support stable operation across full automotive temperature range; RESET timing guarantees safe SoC boot sequence. |
Use Scenario: Supplies 5V to USB-C PD controller and 1.8V to audio codec in infotainment head unit with always-on CAN wake-up capability. IC Role / Device Role / Timing Role: Dual-output regulator with low IQ and programmable reset timeout manages standby and active power states. Use Value: CSRT-adjustable reset delay (e.g., 12.5ms) synchronizes with USB-C enumeration timing; WD-DIS allows software-controlled watchdog disable during firmware updates. |
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 |
|---|---|---|---|
| MAX6792TPLD2+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio mapping (WDS0/WDS1 logic levels). | Same functional scope; used where alternate window ratio (e.g., 64:1) is required for specific MCU timing margins. | Select MAX6792TPLD2+ only if exact watchdog window ratio per Table 4 is needed; otherwise MAX6791TPLD2+ is drop-in. |
| TPS7B8750QKVURQ1 | Single-output (5V only), 300mA, 35μA IQ, no windowed watchdog; includes diagnostic flag and higher PSRR (70dB @ 100Hz). | Lacks dual output and windowed watchdog; suited for simpler 5V-only systems needing diagnostics over supervision granularity. | Choose TPS7B8750QKVURQ1 for cost-optimized 5V-only designs where dual rail and advanced watchdog are unnecessary. |
Compared with MAX6792TPLD2+, the MAX6791TPLD2+ offers identical hardware compatibility but distinct watchdog window configuration logic; versus TPS7B8750QKVURQ1, it trades single-rail simplicity for dual-output flexibility and superior fault detection depth at slightly higher IQ.
Availability
MAX6791TPLD2+ is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS domain controllers, and infotainment systems requiring stable component supply across extended temperature and high-reliability automotive qualification.
Supply support for MAX6791TPLD2+ 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-supervision challenges - combining ultra-low IQ, wide VIN, dual outputs, and advanced watchdog/reset logic in a thermally robust AEC-Q100 package.
FAQ
What output voltage options does the MAX6791TPLD2+ support?
The MAX6791TPLD2+ supports fixed 5V on OUT2 and configurable OUT1: preset options include 5V, 3.3V, 2.5V, or 1.8V (selected by grounding SET1), or an adjustable range from 1.8V to 11V using an external resistor divider. The "L" in the part number denotes 5V OUT1 preset, confirmed in Table 1 of the datasheet.
Does the MAX6791TPLD2+ include reverse-battery protection?
Yes, the MAX6791TPLD2+ integrates reverse-battery protection drive via its GATEP pin, which controls an external p-channel MOSFET to block reverse current without requiring a series diode. This reduces voltage drop and power loss compared to discrete diode solutions.
How is the reset timeout period configured on the MAX6791TPLD2+?
The MAX6791TPLD2+ uses the CSRT pin to configure reset timeout: connecting CSRT to OUT1 selects the factory-programmed D2 setting (12.5ms typical), while adding a capacitor from CSRT to GND enables user-adjustable timing per the RC ramp equation in the datasheet.
Is the MAX6791TPLD2+ AEC-Q100 qualified?
Yes, the MAX6791TPLD2+ is AEC-Q100 qualified (Grade 0: −40°C to +125°C), as explicitly stated in the Benefits and Features section and confirmed in the Ordering Information table for /V+ variants like this part.
What is the function of the HOLD pin on the MAX6791TPLD2+?
The HOLD pin on the MAX6791TPLD2+ enables self-holding behavior: when driven low after initial power-up, it keeps OUT1 enabled even if ENABLE1 returns low - eliminating need for external latch circuitry in ignition-switched automotive subsystems.
MAX6791TPLD2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPLD2+ FAQ
1.How can I place an order for MAX6791TPLD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD2+ 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 MAX6791TPLD2+ reliable?
The price and inventory of MAX6791TPLD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD2+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD2+?
MAX6791TPLD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD2+ 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 MAX6791TPLD2+?
For technical support, including MAX6791TPLD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD2+ requirements.
6.How does Aetrix verify that MAX6791TPLD2+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD2+ 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 MAX6791TPLD2+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD2+?
All MAX6791TPLD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD2+, 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 MAX6791TPLD2+ part is unused and in its original packaging.
Return procedure for MAX6791TPLD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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