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Analog Devices Inc./Maxim Integrated MAX6431CIUS-T
- Part No.:
- MAX6431CIUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6431CIUS-T.pdf
- Description:
- IC BAT MON MULT-CHEM 2C SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6431CIUS-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 1µA typical supply current. It operates from 1.6V to 5.5V and supports battery-good/weak/empty state indication in portable medical devices and cordless phones.
For engineers reviewing the MAX6431CIUS-T datasheet, MAX6431CIUS-T pinout, MAX6431CIUS-T application, or MAX6431CIUS-T equivalent, this page delivers verified electrical specs, dual-threshold timing behavior, SOT143-4 package details, and real-world use cases in low-power battery management systems where stable voltage monitoring and noise-immune hysteresis are critical.
Technical Context
The MAX6431CIUS-T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.7V) for LBOH assertion and VLTH− (e.g., 2.0V) for LBOL assertion, with corresponding deassertion at VHTH+ (≈1.05×VHTH−) and VLTH+ (≈1.05×VLTH−). Its logic is fully specified from −40°C to +85°C.
It uses BATT as both input and power source, requires no external components, and guarantees valid LBO logic states down to BATT = 1.0V. The 140ms timeout ensures output stability after voltage recovery, preventing false wakeups during battery rebound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.6V to 5.5V - powers directly from battery without regulator; supports single Li+ (3.0–4.2V) and 2–3-cell alkaline/NiMH (2.4–4.5V). |
| Supply Current | 1µA typical - enables >1-year battery life in always-on monitoring applications like pagers or medical sensors. |
| Low-Battery Outputs | Dual open-drain LBOH/LBOL - allows independent control of system warning (weak battery) and shutdown (empty battery) paths. |
| Timeout Period | 140ms minimum - prevents chattering during transient voltage recovery after load removal. |
| Threshold Accuracy | ±2.5% - ensures consistent trip points across temperature and unit-to-unit variation without calibration. |
| Output Logic Type | Active-low open-drain - enables flexible pull-up to any voltage ≤5.5V, including higher-voltage microprocessor I/O rails. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable consumer environments without derating. |
Pinout & Package
MAX6431CIUS-T is housed in a 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), lead-free, tape-and-reel compatible, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input and power supply | Direct connection to battery anode; powers internal circuitry and serves as reference for threshold comparators. |
| 2 - LBOH | Low-battery output high (active-low) | Asserts when BATT falls below factory-trimmed VHTH− (e.g., 2.7V); signals "weak battery" condition for low-power mode entry. |
| 3 - GND | Ground reference | Common return path for all internal circuits and comparator references; must be low-impedance for accurate threshold sensing. |
| 4 - LBOL | Low-battery output low (active-low) | Asserts when BATT falls below factory-trimmed VLTH− (e.g., 2.0V); triggers full system shutdown or safe power-down sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VHTH− and VLTH− set at production - eliminates external resistor networks and calibration effort for fixed-voltage battery types. |
| 140ms minimum LBO timeout | Guaranteed delay before deassertion - ensures system only resumes operation after battery voltage stabilizes post-load transient. |
| 1µA typical supply current | Ultra-low quiescent draw - extends shelf life and runtime in battery-backed memory or sleep-mode systems. |
| Open-drain LBOH/LBOL outputs | Independent pull-up capability - permits interfacing with 3.3V or 5V logic while powered from 1.8V–4.2V battery rail. |
| Valid output down to BATT = 1.0V | Full functionality at end-of-discharge - enables reliable shutdown signaling even under deep discharge conditions. |
Applications
| Portable Medical Sensors | Cordless Telephones |
|---|---|
Use Scenario: Continuous glucose monitor operating on a single Li+ cell with periodic wireless transmission. IC Role / Device Role / Timing Role: Dual-threshold monitor providing early warning (LBOH) at 2.7V to reduce RF transmit duty cycle, and hard shutdown (LBOL) at 2.0V to preserve cell integrity. Use Value: Prevents data loss during voltage sag and avoids over-discharge damage by enforcing staged power reduction before cutoff. |
Use Scenario: DECT cordless handset with rechargeable NiMH pack requiring battery status feedback to base station. IC Role / Device Role / Timing Role: Generates LBOH signal to initiate "low battery" LED blink and LBOL to disable audio amplifier and RF section upon critical depletion. Use Value: Enables user-facing battery indicators and graceful call termination without unexpected power loss mid-conversation. |
| Electronic Pagers | PDAs with Removable Batteries |
Use Scenario: Two-way alphanumeric pager using alkaline AA cells with long standby duration. IC Role / Device Role / Timing Role: Monitors declining battery voltage; asserts LBOH to dim display backlight and LBOL to halt message reception and enter deep sleep. Use Value: Extends usable runtime by 30%+ through adaptive power scaling, while guaranteeing clean shutdown before brownout resets. |
Use Scenario: Handheld PDA with hot-swappable Li+ battery and real-time OS requiring deterministic power-state transitions. IC Role / Device Role / Timing Role: Supplies LBOH interrupt to CPU for saving context and LBOL to disable PMIC enable lines, synchronizing firmware and hardware shutdown. Use Value: Eliminates file corruption risk during battery swap by ensuring atomic save-and-power-off sequence with hardware-enforced timing. |
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 |
|---|---|---|---|
| MAX6430CIUS-T | Same SOT143-4 package and dual open-drain outputs, but with lower VHTH−/VLTH− thresholds (e.g., 2.3V/1.6V vs. 2.7V/2.0V for MAX6431CIUS-T). | Better suited for 2-cell alkaline/NiMH systems with lower nominal voltage; less margin for Li+ applications near 3.0V cutoff. | Select MAX6430CIUS-T when monitoring 2.4–3.0V nominal packs; choose MAX6431CIUS-T for 3.0–4.2V Li+ with wider hysteresis window. |
| TLV7032IDGKR | Single-supply dual comparator with external resistive dividers; no built-in hysteresis or timeout; requires external RC timing and pull-ups. | Offers full threshold programmability but increases BOM count and layout complexity; lacks guaranteed 140ms debounce. | Use TLV7032IDGKR only when custom hysteresis or nonstandard trip points are required; MAX6431CIUS-T delivers plug-and-play reliability with zero external parts. |
Compared with MAX6430CIUS-T, MAX6431CIUS-T provides higher threshold setpoints ideal for Li+ systems, while versus TLV7032IDGKR it eliminates design overhead by integrating precision references, hysteresis, and timeout logic in a single chip-reducing validation time and improving field reliability.
Availability
MAX6431CIUS-T is available at Aetrix Electronics and suitable for portable medical devices, cordless telephones, electronic pagers, and PDAs requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.
Supply support for MAX6431CIUS-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, sensing, and interface applications, with emphasis on ultra-low-power and high-reliability solutions.
The MAX6427–MAX6438 family was engineered specifically for battery-state awareness in space- and power-constrained portable electronics, delivering factory-calibrated accuracy without external components.
FAQ
What is the function of the LBOH and LBOL outputs on the MAX6431CIUS-T?
The MAX6431CIUS-T features two independent active-low open-drain outputs: LBOH signals "battery weak" when BATT drops below its factory-trimmed VHTH− threshold (e.g., 2.7V), and LBOL signals "battery empty" when BATT falls below its VLTH− threshold (e.g., 2.0V). Both remain asserted for ≥140ms after voltage recovery to prevent chatter. This dual-level signaling enables staged power management in systems using the MAX6431CIUS-T.
Does the MAX6431CIUS-T require external resistors or capacitors to operate?
No, the MAX6431CIUS-T requires no external components. As a factory-trimmed dual-threshold monitor, it integrates precision voltage references, comparators, hysteresis, and 140ms timeout logic internally. Only BATT, GND, and pull-up resistors on LBOH/LBOL (for open-drain interface) are needed - eliminating calibration, layout area, and BOM cost associated with discrete solutions or adjustable monitors like the MAX6436UT-T.
What is the minimum battery voltage at which the MAX6431CIUS-T remains functional?
The MAX6431CIUS-T guarantees valid LBO logic states down to BATT = 1.0V, with full specification over 1.6V to 5.5V. This ensures reliable shutdown signaling even during deep discharge of alkaline or NiMH cells, and supports operation through the entire usable voltage range of a single Li+ cell (3.0V–2.5V) and beyond - a key reliability feature confirmed in the MAX6431CIUS-T datasheet's Absolute Maximum Ratings and Electrical Characteristics tables.
Can the MAX6431CIUS-T be used with lithium-ion, alkaline, and NiMH batteries?
Yes, the MAX6431CIUS-T is explicitly designed for single Li+ cells (3.0–4.2V) and multicell alkaline/NiCd/NiMH (2.4–4.5V) power supplies. Its factory-trimmed thresholds (e.g., 2.7V/2.0V) align with common Li+ end-of-discharge and warning points, while its 1.6V–5.5V operating range accommodates the full voltage swing of 2–3 alkaline/NiMH cells. This cross-chemistry compatibility is documented in the MAX6431CIUS-T Applications section and General Description.
What package type and footprint does the MAX6431CIUS-T use?
The MAX6431CIUS-T is supplied in a 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), with pinout: Pin 1 = BATT, Pin 2 = LBOH, Pin 3 = GND, Pin 4 = LBOL. It is lead-free, tape-and-reel packaged, and compatible with standard SMT reflow profiles. Package dimensions and land pattern recommendations are defined in Maxim's 21-0052 outline drawing, referenced in the MAX6431CIUS-T datasheet.
MAX6431CIUS-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
MAX6431CIUS-T FAQ
1.How can I place an order for MAX6431CIUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6431CIUS-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 MAX6431CIUS-T reliable?
The price and inventory of MAX6431CIUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6431CIUS-T is usually 5 days.
3.What payment methods are accepted for MAX6431CIUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6431CIUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6431CIUS-T?
MAX6431CIUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6431CIUS-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 MAX6431CIUS-T?
For technical support, including MAX6431CIUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6431CIUS-T requirements.
6.How does Aetrix verify that MAX6431CIUS-T is sourced from the original manufacturer or authorized distributors?
All MAX6431CIUS-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 MAX6431CIUS-T meets industry standards.
7.What is the process for return or replacement of MAX6431CIUS-T?
All MAX6431CIUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6431CIUS-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 MAX6431CIUS-T part is unused and in its original packaging.
Return procedure for MAX6431CIUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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