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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6709DUB+

Name: MAX6709DUB+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6709DUB+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6709DUB+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX6709DUB+.pdf

Description:: IC SUPERVISOR 4 CHANNEL 10UMAX

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Product details

Overview

The MAX6709DUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, providing four independent active-low open-drain power-good outputs with 10µA internal pullups to VCC. It monitors nominal supply voltages of 5.0V (−5%), 3.3V (−5%), 1.8V (−5%), and one adjustable input down to 0.62V, with ±2.0% threshold accuracy, 35µA typical supply current, and operation from 2.0V to 5.5V over −40°C to +85°C.

For engineers reviewing the MAX6709DUB+ datasheet, MAX6709DUB+ pinout, MAX6709DUB+ application, or MAX6709DUB+ equivalent, this page delivers verified electrical parameters, µMAX package layout, real-world use cases in servers and telecom equipment, and two validated alternative parts with precise technical and application-level distinctions.

Technical Context

The MAX6709DUB+ integrates four precision comparators with factory-trimmed resistor-divider networks for fixed-threshold monitoring of 5.0V, 3.3V, and 1.8V supplies at 5% tolerance, plus one high-impedance adjustable input referenced to an internal 0.62V bandgap. Each comparator drives an independent open-drain output with weak internal pullup, enabling wire-ORed power-good signaling without external components.

An internal undervoltage lockout circuit forces all outputs low when VCC drops below 2.0V, and built-in 0.3% threshold hysteresis eliminates noise-induced oscillation-no external feedback resistors required. The device uses BiCMOS process technology and operates across the full industrial temperature range with guaranteed performance at ±2.0% threshold accuracy and 60ppm/°C temperature coefficient.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0V to 5.5V - supports direct connection to monitored rails including 3.3V and 5V systems without level-shifting.
Supply Current (typ)	35µA - enables always-on supervision in battery-backed or low-power embedded systems.
Threshold Accuracy	±2.0% - ensures reliable detection of 5% supply tolerances (e.g., 5.0V → 4.75V trip point) across temperature.
Adjustable Input Threshold	0.62V (±2.0%) - allows monitoring of any voltage ≥0.62V via external resistor divider (e.g., 12V rail using 20:1 ratio).
Output Type	Four independent active-low open-drain outputs with 10µA internal pullup to VCC - simplifies interface to diverse logic families and supports wired-AND fault aggregation.
Operating Temperature	−40°C to +85°C - qualified for industrial and telecom infrastructure environments without derating.
Package	10-pin µMAX (3mm × 3mm) - compact footprint suitable for space-constrained multivoltage PCBs.

Pinout & Package

The MAX6709DUB+ is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 0.8mm), lead-free, with exposed pad for thermal enhancement and standard JEDEC moisture sensitivity level (MSL-1). Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1	IN1	Fixed 5.0V (−5%) monitor input - asserts PWRGD1 low when voltage falls below 4.75V.
2	IN2	Fixed 3.3V (−5%) monitor input - asserts PWRGD2 low when voltage falls below 3.15V.
3	IN3	Fixed 1.8V (−5%) monitor input - asserts PWRGD3 low when voltage falls below 1.71V.
4	IN4	Adjustable threshold input - referenced to 0.62V internal comparator; requires external resistor divider for voltages >0.62V.
5	GND	Analog/digital ground reference - must be connected to system ground plane with low-inductance path.
6	PWRGD4	Open-drain output for IN4 - active-low signal indicating undervoltage on adjustable input; 10µA internal pullup to VCC.
7	PWRGD3	Open-drain output for IN3 - active-low signal for 1.8V rail supervision; compatible with 3.3V/5V logic interfaces.
8	PWRGD2	Open-drain output for IN2 - provides dedicated power-good status for 3.3V domain in mixed-rail systems.
9	PWRGD1	Open-drain output for IN1 - delivers clean reset-ready signal for 5V subsystems without external pullup.
10	VCC	Power supply input - powers internal circuitry and serves as pullup source for all open-drain outputs.

Key Features

Feature	Design Value
Quad independent monitoring	Four separate comparators eliminate need for multiple discrete supervisors - reduces BOM count and layout area in multivoltage designs.
Factory-trimmed thresholds	5.0V/3.3V/1.8V options at 5% tolerance require zero external components - accelerates design-in and improves long-term stability vs. resistor-based solutions.
Adjustable input (IN4)	0.62V reference enables monitoring of arbitrary rails (e.g., 12V, 24V) using only two external resistors - avoids dedicated high-voltage supervisor ICs.
Low quiescent current	35µA typical ICC allows continuous operation in energy-sensitive applications such as backup controllers and IoT edge nodes.
Built-in hysteresis	0.3% of threshold voltage prevents chatter during slow supply ramps or noise transients - removes need for external positive feedback networks.

Applications

Telecom Power Shelf Supervision	Servers with Mixed Voltage Rails
Use Scenario: Monitoring +5V, +3.3V, +1.8V, and auxiliary 12V bias rails in a carrier-grade power shelf with hot-swap capability. IC Role / Device Role / Timing Role: Quad voltage monitor providing independent PWRGD signals per rail to FPGA-based shelf controller for sequencing validation and fault isolation. Use Value: Enables real-time rail health reporting with <5µs propagation delay and no external components - reduces failure-to-detect latency versus discrete resistor-comparator solutions.	Use Scenario: Validating stable power-up of CPU core (1.8V), memory I/O (3.3V), PCIe interface (3.3V), and auxiliary management rail (5.0V) in dual-socket server motherboards. IC Role / Device Role / Timing Role: Centralized power-good arbiter feeding OR'd signal to BMC for system reset coordination and rail-specific fault logging. Use Value: Four dedicated open-drain outputs with 10µA pullups allow direct wire-OR to single BMC interrupt line - eliminates external logic gates and saves 2.5mm² PCB area.
High-End Printer Engine Control	Industrial Data Acquisition Module
Use Scenario: Ensuring clean startup of motor driver (24V), logic (5V), sensor analog supply (3.3V), and FPGA core (1.8V) in laser printer engine control board. IC Role / Device Role / Timing Role: Voltage supervisor asserting individual PWRGD lines to microcontroller GPIOs for per-rail enable sequencing and brownout recovery. Use Value: Adjustable IN4 input monitors 24V rail via 38.7:1 resistor divider - avoids adding a second supervisor IC while maintaining ±2% trip accuracy.	Use Scenario: Supervising isolated analog front-end (±15V), digital logic (3.3V), ADC reference (2.5V), and microcontroller core (1.8V) in ruggedized DAQ module operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Single-chip quad monitor delivering rail-status flags to ARM Cortex-M4 for self-test and graceful shutdown on undervoltage. Use Value: Guaranteed −40°C to +85°C operation with 60ppm/°C TCVTH ensures consistent trip points across temperature - critical for calibration integrity in field-deployed instruments.

Telecom Power Shelf Supervision

Servers with Mixed Voltage Rails

Use Scenario: Monitoring +5V, +3.3V, +1.8V, and auxiliary 12V bias rails in a carrier-grade power shelf with hot-swap capability.

IC Role / Device Role / Timing Role: Quad voltage monitor providing independent PWRGD signals per rail to FPGA-based shelf controller for sequencing validation and fault isolation.

Use Value: Enables real-time rail health reporting with <5µs propagation delay and no external components - reduces failure-to-detect latency versus discrete resistor-comparator solutions.

Use Scenario: Validating stable power-up of CPU core (1.8V), memory I/O (3.3V), PCIe interface (3.3V), and auxiliary management rail (5.0V) in dual-socket server motherboards.

IC Role / Device Role / Timing Role: Centralized power-good arbiter feeding OR'd signal to BMC for system reset coordination and rail-specific fault logging.

Use Value: Four dedicated open-drain outputs with 10µA pullups allow direct wire-OR to single BMC interrupt line - eliminates external logic gates and saves 2.5mm² PCB area.

High-End Printer Engine Control

Industrial Data Acquisition Module

Use Scenario: Ensuring clean startup of motor driver (24V), logic (5V), sensor analog supply (3.3V), and FPGA core (1.8V) in laser printer engine control board.

IC Role / Device Role / Timing Role: Voltage supervisor asserting individual PWRGD lines to microcontroller GPIOs for per-rail enable sequencing and brownout recovery.

Use Value: Adjustable IN4 input monitors 24V rail via 38.7:1 resistor divider - avoids adding a second supervisor IC while maintaining ±2% trip accuracy.

Use Scenario: Supervising isolated analog front-end (±15V), digital logic (3.3V), ADC reference (2.5V), and microcontroller core (1.8V) in ruggedized DAQ module operating in −40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Single-chip quad monitor delivering rail-status flags to ARM Cortex-M4 for self-test and graceful shutdown on undervoltage.

Use Value: Guaranteed −40°C to +85°C operation with 60ppm/°C TCVTH ensures consistent trip points across temperature - critical for calibration integrity in field-deployed instruments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitoring applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6710DUB+	Same pinout and function but with 10% tolerance on 5.0V/3.3V/1.8V inputs - higher trip thresholds (e.g., 5.0V → 4.50V) and identical adjustable input.	Preferred where system supply tolerances are looser (e.g., unregulated DC-DC outputs) and earlier fault detection is acceptable.	Select MAX6710DUB+ if design uses non-critical rails with wider regulation bands; otherwise MAX6709DUB+ provides tighter margin for precision systems.
TPS3307-33DGNR	Triple voltage monitor (not quad); 3.3V fixed + two adjustable inputs; 1.6µA ICC; SOT-23-8 package - lacks fourth fixed monitor and µMAX footprint.	Used in cost-optimized, space-constrained designs needing only three rails; requires external components for adjustable thresholds.	Choose TPS3307-33DGNR only when fourth rail supervision is unnecessary and ultra-low current (<2µA) is mandatory - not a drop-in replacement.

Compared with MAX6710DUB+, the MAX6709DUB+ offers tighter 5% tolerance for critical rails, while TPS3307-33DGNR trades quad functionality for lower current and smaller size - making MAX6709DUB+ optimal for industrial multivoltage systems requiring guaranteed timing and minimal component count.

Availability

The MAX6709DUB+ is available at Aetrix Electronics and suitable for telecommunications infrastructure, server power management, and high-end printer engine control requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6709DUB+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX6709DUB+ belongs to Maxim's precision voltage supervisor product line, engineered specifically for reliable, component-free monitoring of multiple supply rails in dense, thermally demanding multivoltage systems.

FAQ

What is the exact threshold voltage for the 5.0V input on the MAX6709DUB+?

The MAX6709DUB+ IN1 pin is factory-trimmed for 5.0V nominal supply with −5% tolerance, resulting in a guaranteed trip threshold of 4.75V (min) to 4.63V (typ) when the input voltage falls. This value is specified across −40°C to +85°C and includes ±2.0% accuracy and 60ppm/°C temperature coefficient - confirmed in the Electrical Characteristics table under "5.0V (−5%)" row.

Does the MAX6709DUB+ require external pullup resistors on its PWRGD outputs?

No, the MAX6709DUB+ includes 10µA internal pullup current sources to VCC on all four PWRGD outputs, eliminating the need for external pullups in most 3.3V or 5V logic interfacing scenarios. External pullups are only required when interfacing to logic supplies outside the 2.0V–5.5V range or when stronger drive capability is needed - internal pullups remain active and are overdrivable without reverse current flow.

How do I configure the adjustable input (IN4) of the MAX6709DUB+ to monitor a 12V supply?

To monitor 12V with the MAX6709DUB+ IN4 pin, use a resistor divider where R1 connects to 12V, R2 connects to GND, and the node between them feeds IN4. Set R1/R2 ratio so that the divided voltage equals 0.62V at trip point: R1 = R2 × ((12V / 0.62V) − 1) ≈ R2 × 18.35. For example, with R2 = 10kΩ, R1 = 183.5kΩ (use 182kΩ standard value). Confirm with the "Adjustable Input" section in the datasheet Figure 7.

Is the MAX6709DUB+ pin-compatible with other devices in the MAX6709/MAX6714 family?

Yes, all MAX6709 variants (e.g., MAX6709AUB+, MAX6709BUB+, MAX6709DUB+) share identical 10-pin µMAX pinout and electrical interface - only the factory-trimmed threshold voltages differ. However, MAX6709 and MAX6714 are not pin-compatible: MAX6714 substitutes MR, PFIx, PFOx, and RESET pins for the MAX6709's INx and PWRGDx layout, as shown in the Pin Configurations diagrams.

What is the propagation delay of the MAX6709DUB+ when detecting an undervoltage event?

The MAX6709DUB+ exhibits 5µs typical propagation delay (tPD) from input crossing threshold to corresponding PWRGD output assertion, measured with 10mV/µs input slew rate and 100mV overdrive. This value is guaranteed ≤30µs maximum across temperature and supply voltage - critical for fast-fail response in high-reliability systems, as documented in the "Propagation Delay" row of the Electrical Characteristics table.

MAX6709DUB+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 4

Voltage - Threshold:: 1.67V, 3.08V, 4.63V, Adj

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: <1ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-uMAX/uSOP

MAX6709DUB+ FAQ

1.How can I place an order for MAX6709DUB+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6709DUB+ 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 MAX6709DUB+ reliable?

The price and inventory of MAX6709DUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6709DUB+ is usually 5 days.

3.What payment methods are accepted for MAX6709DUB+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6709DUB+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6709DUB+?

MAX6709DUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6709DUB+ 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 MAX6709DUB+?

For technical support, including MAX6709DUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6709DUB+ requirements.

6.How does Aetrix verify that MAX6709DUB+ is sourced from the original manufacturer or authorized distributors?

All MAX6709DUB+ 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 MAX6709DUB+ meets industry standards.

7.What is the process for return or replacement of MAX6709DUB+?

All MAX6709DUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6709DUB+, 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 MAX6709DUB+ part is unused and in its original packaging.

Return procedure for MAX6709DUB+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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