Analog Devices Inc./Maxim Integrated MAX6458UKD0A+T

Overview

The MAX6458UKD0A+T from Analog Devices is a dual-threshold, window voltage monitor IC in a 5-pin SOT23 package, designed for high-voltage (4V–28V) power-rail supervision. It integrates two precision comparators (one for undervoltage, one for overvoltage), internal 0.5% threshold hysteresis, a fixed 50μs timeout period, and a single open-drain output that asserts low when input falls below V_TH− or rises above V_TH+. It is used in multicell Li⁺ battery stacks to enable safe shutdown during out-of-window conditions.

For engineers reviewing the MAX6458UKD0A+T datasheet, MAX6458UKD0A+T pinout, MAX6458UKD0A+T application, or MAX6458UKD0A+T equivalent, this device delivers precise window detection with minimal external components, automotive-grade temperature operation (−40°C to +125°C), and 28V-tolerant open-drain output - critical for robust power-good signaling in industrial and automotive systems.

Technical Context

The MAX6458UKD0A+T implements a dedicated window-detection architecture using two independent comparators sharing a common reference path. Its internal 2.25V ±2.5% bandgap reference sets trip thresholds via external resistor dividers on IN+ (undervoltage sense) and IN− (overvoltage sense), enabling adjustable V_TRIPLOW and V_TRIPHIGH across the 4V–28V supply range.

It features fixed 50μs timeout delay (no latch or CLEAR input), 0.5% internal hysteresis, and operates with only 3.5μA typical supply current at 12V. The open-drain output supports pull-up to voltages up to 28V, independent of V_CC, and remains functional down to V_CC = 1.5V due to undervoltage lockout circuitry.

Key Specifications

Pinout & Package

MAX6458UKD0A+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (package code U5+1, outline 21-0057), optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809ECDR and MAX6315US29D3+T, the MAX6458UKD0A+T uniquely provides adjustable dual-threshold window detection in a single 5-pin package with 28V tolerance and ultra-low current - making it the only option for high-voltage, space-constrained, and battery-life-sensitive window supervision.

Availability

MAX6458UKD0A+T is available at Aetrix Electronics and suitable for automotive battery management, industrial DC-DC supervision, and notebook power sequencing requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6458UKD0A+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX6457–MAX6460 family was engineered specifically for high-voltage, low-power system supervision - delivering precision window monitoring, wide supply range, and AEC-Q100-ready variants for mission-critical power integrity applications.

FAQ

What is the exact timeout behavior of the MAX6458UKD0A+T?

The MAX6458UKD0A+T features a fixed 50μs timeout period. When the monitored voltage enters the valid window (i.e., V_IN+ ≥ V_TH− and V_IN− ≤ V_TH+), the OUT pin transitions high after exactly 50μs. This delay is guaranteed across −40°C to +125°C and is independent of supply voltage between 4V and 28V. No configuration or external components affect this timing.

Can the MAX6458UKD0A+T monitor voltages higher than its VCC supply?

Yes - the MAX6458UKD0A+T can monitor input voltages up to 28V even when powered from a lower V_CC (minimum 4V). The IN+ and IN− pins operate with a 0V to V_CC common-mode range, so external resistor dividers must scale the high-voltage signal into that range. For example, a 24V rail can be monitored using a 10:1 divider feeding IN+ and IN−, while V_CC is supplied from a local 5V rail.

Does the MAX6458UKD0A+T have a latch or clear function?

No - the MAX6458UKD0A+T does not include a CLEAR input or latched output. Unlike the MAX6457, it operates in transparent mode only: OUT asserts low immediately upon violation of either threshold and returns high within 50μs after the voltage re-enters the window. This makes it ideal for continuous real-time window monitoring without manual reset intervention.

What is the maximum sink current capability of the MAX6458UKD0A+T output?

The MAX6458UKD0A+T open-drain output can sink up to 10mA while maintaining VOL ≤ 0.4V at V_CC ≥ 4V and TA = −40°C to +125°C. At elevated temperatures or lower V_CC, sink capability degrades slightly but remains ≥8mA. This supports direct drive of optocouplers, small MOSFET gates, or microcontroller interrupt inputs with standard pull-up resistors.

How is hysteresis implemented in the MAX6458UKD0A+T?

The MAX6458UKD0A+T uses factory-trimmed internal hysteresis of precisely 0.5% of V_TH+, eliminating external components. This creates distinct rising (V_TH+) and falling (V_TH−) thresholds: for a nominal 1.228V reference, V_TH+ = 1.228V and V_TH− = 1.222V. The hysteresis is applied independently to both UV and OV comparators, preventing chatter near trip points in noisy environments.