My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6459UTB
- Part No.:
- MAX6459UTB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6459UTB.pdf
- Description:
- IC SUPERVISOR LOW CUR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:739
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6459UTB from Maxim Integrated is a dual high-voltage, low-power voltage monitor IC designed for window detection and independent overvoltage/undervoltage supervision in 4V–28V systems. It features two independent open-drain outputs (OUTA for undervoltage, OUTB for overvoltage), 5% internal threshold hysteresis, fixed 50μs timeout, and operates across –40°C to +125°C. It is used in multicell Li+ battery-stack protection and automotive power-rail monitoring.
For engineers reviewing the MAX6459UTB datasheet, MAX6459UTB pinout, MAX6459UTB application, or MAX6459UTB equivalent, key selection criteria include its dual-output window-comparator architecture, SOT23-6 package, 5% hysteresis option, 28V-tolerant open-drain outputs, and AEC-Q100 qualification status for automotive use.
Technical Context
The MAX6459UTB integrates two precision comparators with a shared 2.25V ±2.5% internal reference, enabling adjustable trip thresholds via external resistor dividers on IN+ and IN−. Its dual-output topology allows independent assertion of OUTA (low when VIN+ < VTH−) and OUTB (low when VIN− > VTH+), supporting both window-detection and discrete UV/OV monitoring modes.
It employs internal 5% hysteresis (VTH+ = 1.228V, VTH− = 1.167V at +25°C) to suppress noise-induced chatter and uses a fixed 50μs timeout to ensure stable output transitions after threshold crossing. The device draws only 3.5μA typical supply current at 12V and maintains output assertion down to VCC = 1.5V for undervoltage lockout functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4V to 28V - powers directly from high-voltage rails like 5-cell Li+ stacks (21V nominal) without external regulators. |
| Supply Current (typ) | 3.5μA at 12V - enables always-on monitoring in battery-critical systems with minimal quiescent drain. |
| Threshold Hysteresis | 5% - reduces false triggering in noisy automotive or industrial environments without external components. |
| Timeout Period | 50μs - ensures rapid response to overvoltage/undervoltage events while avoiding transient-induced glitches. |
| Output Type | Two independent open-drain n-channel outputs (OUTA, OUTB) - each rated to 28V, allowing pull-up to any voltage ≤28V independent of VCC. |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive and industrial control applications. |
| Reference Voltage | 2.25V ±2.5% - provides stable, temperature-compensated threshold basis for accurate resistor-divider programming. |
Pinout & Package
MAX6459UTB is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058), optimized for space-constrained PCB layouts in automotive and portable power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Open-drain undervoltage output | Asserts low when VIN+ falls below VTH−; requires external pullup; remains asserted during VCC < 4V. |
| 2 - GND | Ground reference | Common return path for all internal circuitry and comparator inputs; must be low-impedance. |
| 3 - IN+ | Noninverting input (UV threshold) | Connects to lower resistor divider node for undervoltage trip setting; common-mode range 0 to VCC. |
| 4 - IN− | Inverting input (OV threshold) | Connects to upper resistor divider node for overvoltage trip setting; supports window detection configuration. |
| 5 - OUTB | Open-drain overvoltage output | Asserts low when VIN− exceeds VTH+; independent of OUTA; also asserts low if VCC drops below 4V. |
| 6 - VCC | Positive supply input | Accepts 4V–28V; powers internal bandgap and comparators; enables operation down to 1.5V for UVLO holdover. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent outputs | OUTA and OUTB provide separate UV/OV fault signals-enables selective shutdown (e.g., disable charger on UV, cut main rail on OV). |
| Factory-trimmed 5% hysteresis | Eliminates need for external hysteresis resistors; stabilizes trip points across temperature (–40°C to +125°C) and supply variation. |
| 28V-tolerant open-drain outputs | Allows pull-up to higher voltages (e.g., 24V system rail) than VCC-supports mixed-voltage interface without level shifters. |
| Low 3.5μA supply current | Enables continuous monitoring in energy-sensitive applications such as e-bike battery packs and IoT edge nodes. |
| AEC-Q100 qualified | Validated for automotive use per AEC-Q100 Rev H (Grade 1); supports functional safety requirements in ASIL-B systems. |
Applications
| Automotive Power-Rail Monitoring | Multicell Li+ Battery Stack Protection |
|---|---|
|
Use Scenario: Monitoring 21V nominal battery stack voltage in EV auxiliary systems or ADAS domain controllers. IC Role / Device Role / Timing Role: MAX6459UTB acts as dual-threshold supervisor-OUTA triggers charge-disable on cell undervoltage; OUTB initiates main-rail shutdown on overvoltage. Use Value: Prevents thermal runaway and cell damage by enforcing strict 18.9V–23.1V operating window with 5% hysteresis and 50μs response. |
Use Scenario: Supervising voltage integrity of 5-cell Li+ series stack powering DC-DC converters in portable medical devices. IC Role / Device Role / Timing Role: MAX6459UTB serves as window comparator-OUTA asserts low to shut down converter on undervoltage; OUTB asserts low on overvoltage. Use Value: Ensures safe battery operation across full temperature range (–40°C to +125°C) with no external hysteresis or timing components required. |
| Notebook System Power Sequencing | Industrial 24V PLC I/O Module |
|
Use Scenario: Validating core 12V and 5V rails during notebook boot sequence before enabling CPU and memory subsystems. IC Role / Device Role / Timing Role: MAX6459UTB functions as dual-rail monitor-IN+ monitors 12V rail; IN− monitors 5V rail; OUTA/OUTB drive enable logic independently. Use Value: Enables precise, independent power-good signaling with 2.25V reference accuracy and 50μs timeout-reducing boot failure risk. |
Use Scenario: Detecting overvoltage transients on 24V field power supply feeding analog I/O channels in factory automation equipment. IC Role / Device Role / Timing Role: MAX6459UTB operates as dedicated OV protector-OUTB drives solid-state relay to disconnect load within 50μs of excursion above 26.4V. Use Value: Provides immunity to short-duration spikes (≤100ns) while asserting fast, reliable shutdown-meeting IEC 61000-4-4 compliance margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6459UTA-T | 0.5% hysteresis instead of 5%; same 50μs timeout, SOT23-6 package, identical pinout | Better suited for precision low-noise systems where tighter trip repeatability is critical; less tolerant of input ripple | Select MAX6459UTA-T when threshold stability dominates over noise immunity; MAX6459UTB preferred for harsh EMI environments. |
| TLV809EADBZR | Single-channel 3.08V fixed-threshold supervisor; 1.8–6V supply; no adjustable window; SOT23-3 package | Lacks dual outputs and programmable thresholds; suitable only for basic single-rail reset generation | Use TLV809EADBZR only for cost-sensitive, single-threshold applications-no window detection or dual-fault capability. |
Compared with MAX6459UTA-T and TLV809EADBZR, the MAX6459UTB uniquely delivers factory-trimmed 5% hysteresis in a dual-output SOT23-6 package, enabling robust window supervision in automotive and industrial 24V systems without design compromises.
Availability
MAX6459UTB is available at Aetrix Electronics and suitable for automotive power-rail monitoring, multicell Li+ battery stack protection, and industrial 24V PLC I/O modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6459UTB 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6457–MAX6460 family was engineered specifically for high-voltage, low-current supervision in battery-powered and automotive systems-emphasizing wide supply range, ultra-low quiescent current, and AEC-Q100 compliance.
FAQ
What is the function of the IN+ and IN− pins on the MAX6459UTB?
The IN+ pin serves as the noninverting input for the undervoltage comparator, while IN− serves as the inverting input for the overvoltage comparator. Together they enable window detection: OUTA goes low when VIN+ drops below VTH− (undervoltage), and OUTB goes low when VIN− exceeds VTH+ (overvoltage). Both inputs accept resistor-divider networks referenced to the internal 2.25V bandgap, supporting precise, adjustable trip thresholds across the 4V–28V supply range in the MAX6459UTB.
Does the MAX6459UTB support AEC-Q100 qualification?
Yes, the MAX6459UTB is AEC-Q100 qualified (Grade 1, –40°C to +125°C), as confirmed in the official Maxim Integrated datasheet revision 7 (July 2017). This qualification validates its reliability for automotive applications including engine control units, ADAS sensors, and body electronics-ensuring robust performance under thermal cycling, humidity, and vibration stress conditions specified in the MAX6459UTB automotive-grade test plan.
What is the maximum sink current capability of the MAX6459UTB outputs?
The MAX6459UTB's OUTA and OUTB outputs each support a continuous sink current of 20mA, with a short-circuit sink current of 10mA at TA = +25°C. Output low voltage is guaranteed ≤0.4V at 1mA sink current and VCC ≥ 4.0V across the full –40°C to +125°C temperature range. This allows direct driving of optocouplers, MOSFET gates, or logic inputs without external buffers in the MAX6459UTB design.
Can the MAX6459UTB monitor voltages higher than its VCC supply?
No-the MAX6459UTB's IN+ and IN− inputs have an absolute maximum rating of (VCC + 0.3V), so they cannot safely monitor voltages exceeding VCC by more than 0.3V. However, its open-drain outputs (OUTA/OUTB) can be pulled up to voltages up to 28V regardless of VCC level-enabling interface with higher-voltage logic or loads while the MAX6459UTB itself runs from a lower local supply.
How does the 5% hysteresis in the MAX6459UTB improve system reliability?
The factory-trimmed 5% hysteresis in the MAX6459UTB creates distinct rising (VTH+) and falling (VTH−) trip thresholds-1.228V and 1.167V respectively at +25°C-preventing output oscillation during slow-moving or noisy input transitions near the threshold. This eliminates false resets or shutdowns in electrically noisy automotive and industrial environments, directly enhancing system uptime and reducing firmware-level debounce overhead in the MAX6459UTB implementation.
MAX6459UTB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 50µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6459UTB FAQ
1.How can I place an order for MAX6459UTB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6459UTB 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 MAX6459UTB reliable?
The price and inventory of MAX6459UTB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6459UTB is usually 5 days.
3.What payment methods are accepted for MAX6459UTB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6459UTB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6459UTB?
MAX6459UTB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6459UTB 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 MAX6459UTB?
For technical support, including MAX6459UTB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6459UTB requirements.
6.How does Aetrix verify that MAX6459UTB is sourced from the original manufacturer or authorized distributors?
All MAX6459UTB 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 MAX6459UTB meets industry standards.
7.What is the process for return or replacement of MAX6459UTB?
All MAX6459UTB units undergo pre-shipment inspection (PSI). If there is an issue with MAX6459UTB, 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 MAX6459UTB part is unused and in its original packaging.
Return procedure for MAX6459UTB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6459UTB Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
