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Analog Devices Inc./Maxim Integrated MAX6794TPLD2+
- Part No.:
- MAX6794TPLD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6794TPLD2+.pdf
- Description:
- IC REG LIN W/SPR VSR 20-TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:854
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Product details
Overview
MAX6794TPLD2+ 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 fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V outputs, and includes push-pull RESET, watchdog timer, HOLD, and ENABLE1/ENABLE2 control - all operating from -40°C to +125°C in automotive systems.
For engineers reviewing the MAX6794TPLD2+ datasheet, MAX6794TPLD2+ pinout, MAX6794TPLD2+ application, or MAX6794TPLD2+ equivalent, key selection considerations include its dual-regulator architecture with independent enable control, 68μA quiescent current under load-dump conditions, AEC-Q100-qualified thermal performance in TQFN-EP, and configurable reset/watchdog timing via CSRT/CSWT pins.
Technical Context
The MAX6794TPLD2+ implements two independent LDO regulators: OUT1 (adjustable or preset) and OUT2 (fixed 5V), each with dedicated ENABLE inputs and shared HOLD functionality. Its supervisory block integrates a precision 1.231V PFI comparator, open-drain/push-pull RESET with 92.5%/87.5% threshold tracking relative to OUT1, and a 280ms min or capacitor-adjustable watchdog timeout.
It uses internal thermal shutdown (165°C), short-circuit protection (200–240mA limit), and output overvoltage protection (105–110% VOUT). The GATEP pin drives an external p-channel MOSFET for reverse-battery protection, eliminating discrete diodes while maintaining low dropout (840mV typ at 100mA for dual mode).
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 (typ) - enables always-on functionality in battery-sensitive applications. |
| Output Current | 150mA per output - supports dual-rail microcontroller or sensor subsystems. |
| Dropout Voltage | 840mV (typ) at 100mA - ensures regulation down to VIN = VOUT + 0.84V under worst-case thermal conditions. |
| Reset Threshold | 92.5% of OUT1 nominal voltage - provides accurate brownout detection tied directly to regulated rail. |
| Watchdog Timeout | 280ms (min, fixed) or capacitor-adjustable - configurable fault-detection window for MCU supervision. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for 2.7W dissipation at high ambient temperatures. |
Pinout & Package
The MAX6794TPLD2+ is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND. Pin 1 is located at the top-left corner adjacent to the marking dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Main regulator output: fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V; max 150mA load. |
| 3 | SET1 | Feedback node for OUT1 - connect to GND for preset voltage or external resistor divider for adjustment. |
| 4 | PFO | Active-low open-drain power-fail output - asserts when PFI falls below 1.231V threshold. |
| 5 | CSWT | Watchdog timeout adjust input - connect to OUT1 for fixed 280ms timeout or capacitor to GND for scaling. |
| 6 | CSRT | Reset timeout adjust input - connect to OUT1 for fixed D2 (12.5ms) timeout or capacitor to GND for scaling. |
| 7 | GND | Analog/digital ground reference and thermal path via EP connection. |
| 8 | RESET | Active-low push-pull reset output - tracks OUT1 voltage and holds low for configured timeout after recovery. |
| 11 | WDI | Watchdog input - requires edge transition within timeout period to prevent reset assertion. |
| 12 | HOLD | Active-low hold input - maintains OUT1 ON even after ENABLE1 goes low, enabling self-holding circuits. |
| 13,14 | OUT2 | Secondary fixed 5V output - independent of OUT1, rated for 150mA continuous load. |
| 15 | ENABLE2 | Active-high enable for OUT2 - internal 0.5μA pulldown allows direct MCU GPIO control. |
| 16 | PFI | Power-fail comparator input - set threshold via resistive divider referenced to internal 1.231V reference. |
| 17,18 | IN | Main regulator input - accepts 5V–72V; bypass with ≥1μF ceramic capacitor to GND. |
| 19 | GATEP | pFET gate drive - controls external PMOS for reverse-battery protection without series diode loss. |
| 20 | ENABLE1 | Active-high enable for OUT1 - internal 0.5μA pulldown enables direct MCU GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | OUT1 (adjustable/preset) + OUT2 (fixed 5V), each with dedicated ENABLE and shared HOLD for flexible power sequencing. |
| Automotive-grade supervision | Integrated RESET with 92.5%/87.5% tracking, 12.5ms fixed timeout (D2), and 280ms watchdog - eliminates external supervisor ICs. |
| Reverse-battery protection | GATEP pin drives external p-channel MOSFET - achieves <100mV drop vs. >600mV diode solution, improving efficiency and thermal margin. |
| Self-holding circuit support | HOLD input latches regulator ON after initial ENABLE1 assertion - enables ignition-key-based power control without external latch components. |
| Thermal robustness | 165°C thermal shutdown with 20°C hysteresis and 2.7W dissipation capability in 5mm × 5mm TQFN - sustains operation at +105°C ambient with 300mA total load. |
| AEC-Q100 qualification | Qualified per AEC-Q100 Rev H Grade 0 (−40°C to +125°C) - meets automotive reliability and stress-test requirements. |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Camera Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in vehicle door modules or lighting controllers. IC Role / Device Role / Timing Role: Dual-rail regulator providing isolated 5V (OUT2) for CAN PHY and 3.3V (OUT1) for MCU core, with RESET supervision and watchdog monitoring. Use Value: Enables single-chip power + supervision for space-constrained BCMs, reducing BOM count and meeting ISO 16750-2 load-dump immunity. | Use Scenario: Supplying image sensor and ISP in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-input-voltage LDO delivering stable 3.3V/5V rails with thermal shutdown and brownout reset to prevent corrupted frame capture during cold cranking. Use Value: Maintains regulation down to 5V input and survives 72V transients, eliminating need for pre-regulator stage in compact camera housings. |
| Infotainment Head Unit Core Logic | Telematics Control Unit (TCU) Power Management |
Use Scenario: Powering application processor I/O, memory, and audio codec in automotive infotainment systems. IC Role / Device Role / Timing Role: Dual-output regulator supplying 1.8V/3.3V rails with independent ENABLE control and HOLD-based power sequencing aligned to ignition state. Use Value: Supports fast wake-up from sleep mode using HOLD latch, reducing system boot latency while maintaining <100μA standby current. | Use Scenario: Managing power for LTE modem, GNSS receiver, and secure element in cellular-connected vehicle telematics units. IC Role / Device Role / Timing Role: Supervised dual-rail regulator with watchdog supervision of modem firmware and RESET-driven safe shutdown on battery disconnect. Use Value: Prevents data corruption during vehicle battery replacement or jump-start events via precise brownout detection and controlled reset assertion. |
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 |
|---|---|---|---|
| MAX6793TPLD2+ | Same pinout, identical dual-output architecture, but lacks windowed watchdog (only standard watchdog); same 150mA per output and 68μA IQ. | No fast/slow fault discrimination - suitable where basic watchdog timeout suffices without windowed timing constraints. | Select MAX6793TPLD2+ when windowed watchdog logic is unnecessary and cost optimization is prioritized. |
| TPS7B8750QKVURQ1 | Single-output 500mA LDO with 35μA IQ, 4.5V–40V input, no dual output or integrated watchdog; requires external supervisor for RESET/WDT. | Requires additional IC for supervision; supports higher current but cannot replace dual-rail functionality natively. | Choose TPS7B8750QKVURQ1 only if single-rail 5V supply dominates system needs and external supervision is acceptable. |
Compared with MAX6793TPLD2+, the MAX6794TPLD2+ adds windowed watchdog capability for enhanced fault classification; compared with TPS7B8750QKVURQ1, it integrates dual regulation and full supervision in one package, reducing board area and component count for multi-rail automotive designs.
Availability
MAX6794TPLD2+ is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply across extended temperature and high-reliability environments.
Supply support for MAX6794TPLD2+ 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 high-voltage automotive power management, integrating dual LDO regulation, RESET supervision, watchdog timing, and reverse-battery protection into a single AEC-Q100-qualified package.
FAQ
What output voltage options does the MAX6794TPLD2+ support?
The MAX6794TPLD2+ supports fixed 5V, 3.3V, 2.5V, or 1.8V on OUT1 (selected by SET1 connection), plus a fixed 5V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistor divider. The "L" in the part number indicates a 5V preset for OUT1, confirmed in the datasheet's ordering guide and electrical characteristics tables.
Does the MAX6794TPLD2+ include reverse-battery protection?
Yes, the MAX6794TPLD2+ includes integrated reverse-battery protection via its GATEP pin, which drives an external p-channel MOSFET. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss. The GATEP driver is rated for 13.8V–18.8V clamp voltage and supports fast turn-on/turn-off for robust protection during battery reversal events.
How is the reset timeout period configured on the MAX6794TPLD2+?
The MAX6794TPLD2+ uses the CSRT pin to configure reset timeout: connecting CSRT to OUT1 selects the internally fixed D2 setting (12.5ms typical). For adjustable timing, a capacitor from CSRT to GND sets the timeout per the formula tRP = CCSRT × 1.2V / 1µA. This is verified in the Electrical Characteristics table and Typical Operating Characteristics figure toc16.
Is the MAX6794TPLD2+ AEC-Q100 qualified?
Yes, the MAX6794TPLD2+ is AEC-Q100 qualified per Grade 0 (−40°C to +125°C), as explicitly stated in the Benefits and Features section and confirmed in the Ordering Information table for variants marked "/V+". This qualification covers stress testing for temperature cycling, humidity, ESD, and mechanical shock required for automotive under-hood applications.
What is the function of the HOLD pin on the MAX6794TPLD2+?
The HOLD pin on the MAX6794TPLD2+ is an active-low input that latches the regulator ON after initial enable, allowing OUT1 to remain active even if ENABLE1 is subsequently pulled low. This enables self-holding circuits - for example, tying HOLD to ignition-switched 12V permits the regulator to stay on after key-on, then shut down cleanly when ignition is turned off and HOLD is released.
MAX6794TPLD2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- 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)
MAX6794TPLD2+ FAQ
1.How can I place an order for MAX6794TPLD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6794TPLD2+ 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 MAX6794TPLD2+ reliable?
The price and inventory of MAX6794TPLD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6794TPLD2+ is usually 5 days.
3.What payment methods are accepted for MAX6794TPLD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6794TPLD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6794TPLD2+?
MAX6794TPLD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6794TPLD2+ 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 MAX6794TPLD2+?
For technical support, including MAX6794TPLD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6794TPLD2+ requirements.
6.How does Aetrix verify that MAX6794TPLD2+ is sourced from the original manufacturer or authorized distributors?
All MAX6794TPLD2+ 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 MAX6794TPLD2+ meets industry standards.
7.What is the process for return or replacement of MAX6794TPLD2+?
All MAX6794TPLD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6794TPLD2+, 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 MAX6794TPLD2+ part is unused and in its original packaging.
Return procedure for MAX6794TPLD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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