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Analog Devices Inc./Maxim Integrated MAX6431DHUS-T
- Part No.:
- MAX6431DHUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6431DHUS-T.pdf
- Description:
- IC BAT MON MULT-CHEM 2C SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6431DHUS-T from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or multi-cell alkaline/NiMH/NiCd power supplies. It provides two active-low open-drain outputs (LBOH and LBOL) with 140ms minimum timeout, ±2.5% threshold accuracy, and operates from 1.6V to 5.5V supply. It enables three-state battery status signaling-good, weak, and empty-in portable medical devices and cordless phones.
For engineers reviewing the MAX6431DHUS-T datasheet, MAX6431DHUS-T pinout, MAX6431DHUS-T application, or MAX6431DHUS-T equivalent, this device delivers verified dual-threshold monitoring with hysteresis, low 1µA quiescent current, guaranteed LBO logic state down to BATT = 1.0V, and SOT143-4 package compatibility for space-constrained battery-powered systems.
Technical Context
The MAX6431DHUS-T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (high-threshold assert) and VLTH− (low-threshold assert), plus corresponding deassert thresholds VHTH+ and VLTH+. Its timing circuit enforces a 140ms minimum timeout before output deassertion to prevent false recovery signals during voltage transients.
It uses BATT as both input and power source, requires no external components, and features open-drain outputs compatible with pull-up voltages up to 5.5V-enabling direct interface to higher-voltage microcontrollers while operating from the monitored battery rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.6V to 5.5V on BATT pin - supports direct connection to single Li+ (2.7–4.2V) or 2–3-cell alkaline/NiMH (2.0–4.5V) without regulation. |
| Supply Current | 1µA typical - enables >10-year battery life in low-duty-cycle applications like pagers and medical sensors. |
| Low-Battery Timeout Period | 140ms minimum - ensures stable voltage recovery before system wake-up, preventing chattering during load removal or battery rebound. |
| Threshold Accuracy | ±2.5% over −40°C to +85°C - guarantees reliable trip points across industrial temperature range without calibration. |
| Output Type | Active-low open-drain LBOH and LBOL - allows flexible pull-up to any voltage ≤5.5V, decoupling logic interface from monitored supply. |
| Guaranteed Valid Output | LBO logic state valid down to BATT = 1.0V - ensures fail-safe shutdown signaling even under deep discharge conditions. |
Pinout & Package
MAX6431DHUS-T is housed in a 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), lead-free, RoHS-compliant, and specified for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input and power supply | Monitored supply rail serves as IC's VDD; enables true single-supply operation without auxiliary bias. |
| 2 - LBOH | High-threshold low-battery output | Asserts when BATT falls below factory-trimmed VHTH−; signals "weak battery" for low-power mode entry. |
| 3 - GND | Ground reference | Common return for all internal circuitry and comparator references; must be low-impedance for accurate threshold sensing. |
| 4 - LBOL | Low-threshold low-battery output | Asserts when BATT falls below factory-trimmed VLTH−; signals "empty battery" to trigger system disable or safe shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VHTH−/VHTH+ and VLTH−/VLTH+ set at production - eliminates external resistor networks and calibration effort for consistent performance across batches. |
| 140ms minimum timeout period | Hardware-enforced delay prevents premature recovery assertion - avoids microprocessor reset loops caused by transient dips or battery recovery spikes. |
| Open-drain outputs with 5.5V tolerance | LBOH/LBOL can be pulled to voltage independent of BATT - enables direct interfacing to 3.3V or 5V logic without level shifters. |
| Immunity to short voltage transients | Validated against fast transients per datasheet Figure 3 - suppresses false triggers from switching noise, ESD coupling, or load dump events. |
| Operation down to 1.0V BATT | Functional output state guaranteed at 1.0V - ensures deterministic shutdown signaling even after deep discharge, critical for data retention safety. |
Applications
| Portable Medical Sensors | Cordless Telephones |
|---|---|
Use Scenario: Continuous glucose monitor powered by a single Li+ cell with strict low-power sleep/wake cycles. IC Role / Device Role / Timing Role: Dual-threshold monitor asserting LBOH at 3.2V (enter ultra-low-power mode) and LBOL at 2.8V (initiate graceful shutdown). Use Value: Prevents unexpected power loss during measurement; extends usable battery life by 18% via adaptive power scaling before critical depletion. |
Use Scenario: DECT cordless handset with rechargeable NiMH battery pack requiring precise end-of-discharge detection. IC Role / Device Role / Timing Role: Provides separate "low battery" warning (LBOH) and "replace battery" signal (LBOL) to base station and display controller. Use Value: Eliminates ambiguous "low battery" icons; enables user-directed battery swap before call drop, improving perceived reliability. |
| Pagers | Electronic Toys |
Use Scenario: Two-way alphanumeric pager using two alkaline AA cells with infrequent but critical message reception. IC Role / Device Role / Timing Role: Monitors declining voltage to maintain RF receiver sensitivity until LBOL triggers full system hibernation. Use Value: Guarantees ≥99.5% message capture rate down to 2.2V per cell; avoids missed alerts due to premature brownout. |
Use Scenario: Interactive learning toy with voice playback and LED feedback powered by three AAA alkaline cells. IC Role / Device Role / Timing Role: Uses LBOH to dim LEDs and reduce audio volume, then LBOL to disable motor drivers and halt playback. Use Value: Extends playtime by 22% through staged power reduction; prevents erratic behavior (e.g., stuttering speech) near EOD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-level battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6430DHUS-T | Identical SOT143-4 package and dual open-drain outputs, but with lower factory-trimmed thresholds (e.g., VHTH− = 2.3V vs. 2.6V for MAX6431DHUS-T). | Suitable for 2-cell alkaline/NiMH systems where earlier low-power transition is required. | Select MAX6430DHUS-T when system firmware expects warning at ~2.3V; verify hysteresis margin aligns with battery discharge curve. |
| TLV809E26DBZR | Single-output, push-pull, fixed 2.63V threshold with 140ms reset timeout; no dual-threshold capability; SOT23-3 package. | Only supports binary (good/bad) battery indication; lacks weak-battery warning functionality. | Choose only if application requires simple power-on reset or single-threshold brownout detection-not for three-state battery management. |
Compared with MAX6430DHUS-T and TLV809E26DBZR, the MAX6431DHUS-T uniquely delivers verified dual-threshold hysteresis in a compact 4-pin package, enabling precise battery state segmentation without external components-critical for systems requiring differentiated low-power and shutdown actions.
Availability
MAX6431DHUS-T is available at Aetrix Electronics and suitable for portable medical devices, cordless telephones, pagers, and electronic toys requiring stable component supply and long-term lifecycle support.
Supply support for MAX6431DHUS-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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and consumer markets.
The MAX6427–MAX6438 family was engineered specifically for ultra-low-power, multi-threshold battery monitoring in space- and energy-constrained portable electronics-prioritizing sub-µA quiescent current, guaranteed operation down to 1.0V, and zero-component integration.
FAQ
What is the function of the LBOH and LBOL outputs on the MAX6431DHUS-T?
The MAX6431DHUS-T features two independent open-drain outputs: LBOH asserts when the battery voltage falls below the factory-trimmed high-threshold (VHTH−), signaling a "weak battery" condition; LBOL asserts at the lower factory-trimmed threshold (VLTH−), indicating "empty battery." Both outputs remain asserted for ≥140ms after voltage recovery to ensure stable system response.
Does the MAX6431DHUS-T require external resistors to set its thresholds?
No. The MAX6431DHUS-T uses factory-trimmed internal thresholds - VHTH−, VHTH+, VLTH−, and VLTH+ - eliminating the need for external resistors or calibration. This distinguishes it from the user-adjustable MAX6436–MAX6438 series and ensures consistent performance across units and temperature.
Can the MAX6431DHUS-T operate from a single 1.5V alkaline cell?
No. The MAX6431DHUS-T requires a minimum supply voltage of 1.6V on the BATT pin to guarantee functional operation and valid output states. While it maintains defined logic behavior down to BATT = 1.0V, stable operation begins at 1.6V - making it suitable for 2-cell alkaline (3.0V nominal) or single Li+ (2.7–4.2V), but not single 1.5V cells.
What is the maximum allowable pull-up voltage for the LBOH and LBOL pins of the MAX6431DHUS-T?
The LBOH and LBOL pins of the MAX6431DHUS-T support pull-up voltages up to 5.5V, independent of the BATT supply voltage. This allows direct interfacing with 3.3V or 5V microcontroller I/O pins without level-shifting circuitry, simplifying design and reducing BOM count.
How does the 140ms timeout period improve system reliability in the MAX6431DHUS-T?
The 140ms minimum timeout period in the MAX6431DHUS-T prevents premature deassertion of LBOH or LBOL during brief voltage recoveries - such as those caused by load removal or battery surface charge rebound. This ensures microcontrollers and power converters only resume operation after confirmed voltage stabilization, avoiding repeated brownout resets.
MAX6431DHUS-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 2
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6431DHUS-T FAQ
1.How can I place an order for MAX6431DHUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6431DHUS-T 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 MAX6431DHUS-T reliable?
The price and inventory of MAX6431DHUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6431DHUS-T is usually 5 days.
3.What payment methods are accepted for MAX6431DHUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6431DHUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6431DHUS-T?
MAX6431DHUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6431DHUS-T 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 MAX6431DHUS-T?
For technical support, including MAX6431DHUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6431DHUS-T requirements.
6.How does Aetrix verify that MAX6431DHUS-T is sourced from the original manufacturer or authorized distributors?
All MAX6431DHUS-T 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 MAX6431DHUS-T meets industry standards.
7.What is the process for return or replacement of MAX6431DHUS-T?
All MAX6431DHUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6431DHUS-T, 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 MAX6431DHUS-T part is unused and in its original packaging.
Return procedure for MAX6431DHUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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