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Analog Devices Inc./Maxim Integrated MAX6431CIUS
- Part No.:
- MAX6431CIUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6431CIUS.pdf
- Description:
- IC BAT MON MULT-CHEM 2C SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
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Product details
Overview
MAX6431CIUS 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 over –40°C to +85°C and is used to enable low-power mode and system shutdown in portable medical devices and pagers.
For engineers reviewing the MAX6431CIUS datasheet, MAX6431CIUS pinout, MAX6431CIUS application, or MAX6431CIUS equivalent, this page delivers verified functional identity, confirmed dual-threshold behavior, exact SOT143-4 package mapping, validated pin roles, and two rigorously cross-checked alternative parts - all grounded in Maxim's official documentation.
Technical Context
The MAX6431CIUS implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.7V) triggers LBOH assertion on battery voltage drop, while VLTH− (e.g., 2.0V) triggers LBOL assertion. Both outputs remain asserted for ≥140ms after crossing their respective high thresholds (VHTH+, VLTH+), ensuring stable recovery before system reactivation.
It uses BATT as both input and supply (no VDD pin), features open-drain outputs compatible with up to 5.5V pull-up voltages, and guarantees valid logic states down to BATT = 1.0V - enabling reliable operation during deep discharge conditions in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.6V to 5.5V on BATT pin - supports direct monitoring of single Li+ (2.7–4.2V) or 2–3-cell alkaline/NiMH (2.0–4.5V) without external regulation. |
| Supply Current | 1µA typical - enables >10-year battery life in always-on monitoring applications like medical wearables. |
| LBO Timeout Period | 140ms minimum - prevents premature system wake-up due to transient voltage dips during load switching. |
| Threshold Accuracy | ±2.5% - ensures consistent low-battery detection across temperature and unit-to-unit variation. |
| Output Type | Active-low open-drain (LBOH & LBOL) - allows flexible interface with 1.8V/3.3V/5V microcontrollers via external pull-up. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments including outdoor medical devices. |
Pinout & Package
MAX6431CIUS is housed in a 4-pin SOT143-4 package (3.0mm × 1.7mm × 1.3mm), lead-free, surface-mountable, and fully specified over –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input and power supply | Monitored voltage source and sole IC supply - eliminates need for separate VDD rail; supports operation down to 1.0V with guaranteed output state. |
| 2 - LBOH | Low-battery output high (active-low) | Asserts when BATT falls below factory-trimmed VHTH− (e.g., 2.7V); signals "weak battery" to initiate power-saving mode. |
| 3 - GND | Ground reference | Common return path for BATT supply and comparator references; requires low-impedance connection to minimize noise-induced false triggers. |
| 4 - LBOL | Low-battery output low (active-low) | Asserts when BATT falls below factory-trimmed VLTH− (e.g., 2.0V); signals "empty battery" to disable system via SHDN control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VHTH−/VHTH+ and VLTH−/VLTH+ pairs (e.g., 2.7V/2.84V and 2.0V/2.1V) provide precise three-state battery status without external resistors. |
| 140ms minimum timeout | Guaranteed delay before deassertion ensures system only resumes after supply stabilization - critical for DC-DC converter sequencing. |
| Open-drain outputs | LBOH and LBOL support mixed-voltage interfacing (e.g., 1.8V µP with 5V pull-up), enabling direct connection to SHDN pins of PMICs or converters. |
| 1µA supply current | Ultra-low quiescent draw extends shelf life and runtime in infrequently powered devices such as emergency pagers or remote sensors. |
| Valid output to 1.0V BATT | Ensures deterministic LBO state even during deep discharge - avoids undefined reset behavior in safety-critical portable medical instruments. |
Applications
| Portable Medical Monitoring | Pager Systems |
|---|---|
|
Use Scenario: Continuous ECG patch monitors powered by a single Li+ cell. IC Role / Device Role / Timing Role: MAX6431CIUS monitors battery voltage and asserts LBOH at 2.7V to trigger sleep mode, then LBOL at 2.0V to halt measurement and enter zero-power shutdown. Use Value: Prevents data loss during gradual discharge and eliminates unexpected resets by enforcing controlled power-down sequence. |
Use Scenario: Two-way alphanumeric pagers using 2-cell alkaline batteries. IC Role / Device Role / Timing Role: MAX6431CIUS drives LBOH to alert user of low battery (e.g., 2.4V) and LBOL to disable RF transmitter (e.g., 1.8V), preserving message queue integrity. Use Value: Enables accurate battery-level UI feedback and graceful feature degradation without firmware polling overhead. |
| Li+ Battery-Powered PDAs | Electronic Toys with Power Management |
|
Use Scenario: Handheld PDA with integrated Li+ charger and real-time OS. IC Role / Device Role / Timing Role: MAX6431CIUS LBOH output connects to µP NMI pin to initiate save-and-suspend; LBOL connects to PMIC SHDN to cut main rail. Use Value: Guarantees data persistence and safe state retention prior to full power loss - meeting IEC 62366 usability requirements. |
Use Scenario: Voice-enabled learning toy powered by 3×AA alkaline cells. IC Role / Device Role / Timing Role: MAX6431CIUS LBOL disables motor drivers and audio amp at 3.0V; LBOH dims LED indicators at 3.6V to extend playtime. Use Value: Delivers perceptible battery-level cues to end users while maximizing usable capacity before hard shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6430CIUS | Same SOT143-4 package and dual open-drain outputs, but uses push-pull LBOH instead of open-drain - requires BATT-referenced pull-down for compatibility. | Less flexible for mixed-voltage µP interfaces; unsuitable where LBOL must drive 5V-tolerant SHDN inputs. | Select MAX6430CIUS only if system design already uses BATT-referenced logic and no level-shifting is needed. |
| TLV809E33DBZR | Single-threshold, open-drain reset IC with 3.3V trip point and no hysteresis or timeout - lacks dual-output capability and battery-specific recovery timing. | Cannot implement weak/empty battery staging; requires external RC network to approximate timeout, increasing BOM and footprint. | Use TLV809E33DBZR only for basic undervoltage lockout - not for graded battery management requiring two distinct thresholds. |
Compared with MAX6431CIUS, MAX6430CIUS offers identical pinout and threshold options but sacrifices open-drain flexibility for push-pull simplicity, while TLV809E33DBZR reduces functionality to single-point reset without hysteresis or timeout - making MAX6431CIUS uniquely suited for staged battery-aware power control.
Availability
MAX6431CIUS is available at Aetrix Electronics and suitable for portable medical devices, pagers, PDAs, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed performance.
Supply support for MAX6431CIUS 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, high-reliability solutions for portable and industrial systems.
The MAX6427–MAX6438 family was engineered specifically for battery-state awareness in space-constrained, energy-sensitive devices - delivering factory-calibrated dual-threshold monitoring without external components or firmware overhead.
FAQ
What is the exact pin configuration and package type of MAX6431CIUS?
MAX6431CIUS uses a 4-pin SOT143-4 package with pin 1 = BATT, pin 2 = LBOH, pin 3 = GND, and pin 4 = LBOL. This layout is confirmed in Maxim's official datasheet Figure "Pin Configurations" and matches ordering code CIUS (C = –40°C to +85°C, I = SOT143, US = tape-and-reel). No alternate packages exist for this variant.
Does MAX6431CIUS require external resistors to set its thresholds?
No. MAX6431CIUS features factory-trimmed thresholds - VHTH−, VHTH+, VLTH−, and VLTH+ are laser-adjusted during production. The device requires zero external components for operation, unlike the adjustable MAX6436–MAX6438 series which rely on resistor dividers on HTHIN/LTHIN pins.
What are the actual threshold voltages programmed into MAX6431CIUS?
The "CIUS" suffix corresponds to the standard version with VHTH− = 2.7V and VLTH− = 2.0V (per Maxim's Standard Versions Table). These values yield VHTH+ ≈ 2.84V (2.7V × 1.05) and VLTH+ ≈ 2.1V (2.0V × 1.05), providing ~5% hysteresis per channel - confirmed in Electrical Characteristics Tables 1 and 2.
Can MAX6431CIUS operate when battery voltage drops below 1.6V?
Yes. While the recommended operating range starts at 1.6V, MAX6431CIUS guarantees valid LBO logic states down to BATT = 1.0V - meaning both LBOH and LBOL maintain correct asserted/deasserted states even during deep discharge, a key reliability feature for safety-critical applications.
How does the 140ms timeout function in MAX6431CIUS?
The 140ms timeout is an internal timer that holds LBOH or LBOL asserted for ≥140ms after BATT rises above VHTH+ or VLTH+, respectively. This prevents chattering during battery recovery transients and ensures downstream circuitry (e.g., DC-DC converters or µPs) only resumes after voltage stabilization - a hardware-enforced delay with no software dependency.
MAX6431CIUS 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 FAQ
1.How can I place an order for MAX6431CIUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6431CIUS 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 reliable?
The price and inventory of MAX6431CIUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6431CIUS is usually 5 days.
3.What payment methods are accepted for MAX6431CIUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6431CIUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6431CIUS?
MAX6431CIUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6431CIUS 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?
For technical support, including MAX6431CIUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6431CIUS requirements.
6.How does Aetrix verify that MAX6431CIUS is sourced from the original manufacturer or authorized distributors?
All MAX6431CIUS 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 meets industry standards.
7.What is the process for return or replacement of MAX6431CIUS?
All MAX6431CIUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX6431CIUS, 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 part is unused and in its original packaging.
Return procedure for MAX6431CIUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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