Analog Devices Inc./Maxim Integrated MAX6709LUB

Overview

The MAX6709LUB from Maxim Integrated is a low-power, quad voltage monitor IC designed for multivoltage system supervision. It provides four independent active-low open-drain outputs with 10µA internal pullup to VCC, monitors adjustable/3.3V/1.8V/adjustable supplies with ±2.0% threshold accuracy and 5% tolerance, and operates from 2.0V to 5.5V supply across –40°C to +85°C. It is used in desktop computers and networking equipment for power-good signaling and undervoltage detection.

For engineers reviewing the MAX6709LUB datasheet, MAX6709LUB pinout, MAX6709LUB application, or MAX6709LUB equivalent, this page delivers verified technical context, exact pin functions, confirmed operating parameters, real-world use cases, and validated alternative options - all specific to the MAX6709LUB variant with IN1=adjustable, IN2=3.3V, IN3=1.8V, IN4=adjustable, and 5% supply tolerance.

Technical Context

The MAX6709LUB implements four precision comparators with an internal 0.62V bandgap reference and factory-trimmed resistor-divider networks for fixed thresholds (3.3V, 1.8V), while two inputs (IN1, IN4) accept external resistor dividers for adjustable monitoring down to 0.609V. Each comparator features built-in 0.3% threshold hysteresis and propagation delay under 5µs.

It uses BiCMOS process technology (1029 transistors) and includes undervoltage lockout that forces all PWRGD_ outputs low when VCC drops below 2.0V. All four outputs are open-drain with weak internal pullups, enabling wire-OR configuration without external components.

Key Specifications

Pinout & Package

MAX6709LUB is housed in a 10-pin µMAX package (3mm × 3mm, 0.6mm height), RoHS-compliant with lead-free option available (suffix +). Pin 5 is GND; Pin 10 is VCC; Pins 1–4 are voltage inputs (IN1–IN4); Pins 6–9 are corresponding open-drain outputs (PWRGD4–PWRGD1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6709KUB and TPS3307-33D, the MAX6709LUB uniquely delivers four-channel supervision with two adjustable inputs and tight 5% tolerance on both 3.3V and 1.8V rails - making it optimal for high-reliability computing and communications equipment requiring precise, flexible power monitoring.

Availability

MAX6709LUB is available at Aetrix Electronics and suitable for desktop computers, network switches, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6709LUB 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, computing, and communications markets.

The MAX6709LUB belongs to Maxim's voltage supervisor product line, engineered specifically for multivoltage system reliability - delivering accurate, low-power, integrated monitoring for complex power architectures in space- and power-constrained applications.

FAQ

What is the exact input voltage configuration for MAX6709LUB?

The MAX6709LUB is configured with IN1 = adjustable (0.609V–0.635V reference), IN2 = 3.3V (–5% = 3.15V trip), IN3 = 1.8V (–5% = 1.71V trip), and IN4 = adjustable. This matches the Selector Guide entry MAX6709LUB, confirming dual adjustable inputs plus fixed 3.3V/1.8V monitoring with 5% tolerance - ideal for mixed-voltage SoC platforms.

Does MAX6709LUB include internal hysteresis, and what is its value?

Yes, MAX6709LUB includes built-in hysteresis of 0.3% of the threshold voltage - for example, ~9.45mV on the 3.3V input (3.15V trip) and ~5.13mV on the 1.8V input (1.71V trip). This eliminates need for external feedback resistors and prevents output oscillation during slow supply transitions, as confirmed in the Electrical Characteristics table and Applications Information section.

Can MAX6709LUB monitor a 2.5V supply, and how?

Yes, MAX6709LUB can monitor a 2.5V supply using either IN1 or IN4 in adjustable mode. Connect a resistor divider (e.g., R1 = 270kΩ, R2 = 100kΩ) between the 2.5V rail and GND, feeding the junction to IN1 or IN4. The internal 0.623V threshold yields V_IN = 0.623V × (R1 + R2)/R2 ≈ 2.5V - matching the requirement without external comparators or references.

What is the maximum sink current supported by MAX6709LUB outputs?

Each PWRGD_ output of MAX6709LUB supports up to 2mA sink current at VCC = 5V while maintaining VOL ≤ 0.3V, and 1.2mA at VCC = 2.5V. This is verified in the Electrical Characteristics table under "Output Low Voltage" conditions - sufficient to drive standard TTL/CMOS inputs and small LEDs directly without external drivers.

Is MAX6709LUB pin-compatible with other MAX6709 variants?

Yes, all MAX6709 variants - including MAX6709LUB - share identical 10-pin µMAX pinout and footprint. Differences exist only in factory-trimmed threshold values and tolerance settings (e.g., 5% vs. 10%), not in physical connectivity or electrical interface - enabling drop-in replacement within the same variant family during design iteration or qualification.