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Analog Devices Inc./Maxim Integrated MAX6429OSUR+T
- Part No.:
- MAX6429OSUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429OSUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,282
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Product details
Overview
MAX6429OSUR+T from Maxim Integrated is a factory-trimmed single-output battery monitor IC for Li+ and alkaline/NiMH/NiCd power supplies, featuring 2.0V low-threshold, 2.7V high-threshold, 140ms LBO timeout, 1µA supply current, and push-pull active-low LBO output in SOT23-3 package - used to trigger low-power mode or system shutdown in portable medical devices and MP3 players.
For engineers reviewing the MAX6429OSUR+T datasheet, MAX6429OSUR+T pinout, MAX6429OSUR+T application, or MAX6429OSUR+T equivalent, this page delivers verified threshold voltages, timeout behavior, output logic type, operating voltage range (1.0V–5.5V), and direct alternative options for battery-state monitoring in space-constrained, ultra-low-power systems.
Technical Context
The MAX6429OSUR+T implements a dual-comparator architecture with internal 615mV reference, fixed hysteresis between VLTH = 2.0V and VHTH = 2.7V (±2.5%), and built-in 140ms minimum timeout timer to prevent false LBO deassertion during transient recovery. It operates without external components and guarantees valid LBO logic state down to BATT = 1.0V.
Its push-pull LBO output drives directly from BATT (not VDD), supports ISINK up to 3.2mA at 4.5V, and remains functional across –40°C to +85°C. Immunity to short battery transients (<100µs) and guaranteed VOL ≤ 0.4V ensure robust interface with microprocessor NMI or reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Low Threshold (VLTH) | 2.0V ±2.5% - triggers LBO assertion when battery drops below nominal 2.0V, suitable for end-of-discharge detection in single Li+ cells. |
| High Threshold (VHTH) | 2.7V ±2.5% - requires battery to rise above 2.7V before LBO deassertion, enabling hysteresis of 700mV to suppress noise-induced chatter. |
| Supply Current | 1µA typical - enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| LBO Timeout Period | 140ms minimum - ensures stable voltage recovery before re-enabling system logic, preventing premature wake-up after load removal. |
| Operating Voltage Range | 1.0V to 5.5V - supports full discharge monitoring from deep depletion (1.0V) through full charge (4.2V Li+) without auxiliary biasing. |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor; sinks up to 3.2mA at 4.5V for direct NMI/reset drive. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint ideal for wearables and compact handhelds with minimal PCB area budget. |
Pinout & Package
SOT23-3 package: 1.3mm height, 2.92mm × 1.3mm body, 0.95mm lead pitch, lead-free (RoHS-compliant) construction per MAX6429OSUR+T ordering suffix.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BATT | Main battery-voltage input and power supply rail; powers internal comparators and logic; monitored against VLTH/VHTH thresholds. |
| 2 | LBO | Active-low push-pull output; asserts low when BATT < 2.0V, deasserts high after BATT > 2.7V and 140ms timeout - directly interfaces microcontroller NMI or enable pins. |
| 3 | GND | Analog/digital ground reference; must be connected to system ground plane with low-impedance path to minimize threshold error. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.0V/2.7V pair laser-trimmed at wafer test - eliminates calibration effort and external resistor networks required by adjustable variants. |
| Ultra-low quiescent current | 1µA typical - reduces standby power loss by >95% vs. discrete comparator solutions, extending shelf life in battery-backed systems. |
| Guaranteed LBO validity to 1.0V | Functional LBO assertion/deassertion guaranteed down to BATT = 1.0V - enables full-depth discharge monitoring without brownout risk. |
| Push-pull output stage | No external pull-up needed; drives logic-low directly to microcontroller NMI with <0.4V VOL at 3.2mA - simplifies BOM and layout. |
| Transient immunity | Immune to battery voltage spikes <100µs - prevents false LBO assertion during motor startup or RF burst events in portable equipment. |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring precise end-of-life warning before data loss. IC Role / Device Role / Timing Role: Battery monitor asserting LBO at 2.0V to trigger EEPROM save-and-shutdown sequence prior to cutoff. Use Value: Prevents ungraceful power loss during critical sensor readout, leveraging 140ms timeout to confirm stable low-voltage condition. |
Use Scenario: Flash-based audio player using single Li+ cell, where runtime estimation depends on accurate low-battery flagging. IC Role / Device Role / Timing Role: Single-point voltage supervisor generating LBO signal to enter sleep mode at 2.0V, resuming only after 2.7V recovery. Use Value: Extends usable battery capacity by 8–12% versus fixed 2.5V cutoff, while eliminating false wakeups via hysteresis and timeout. |
| Electronic Toys | PDAs |
Use Scenario: Voice-recording toy with alkaline AA cells, needing audible low-battery alert before motor stall or audio distortion. IC Role / Device Role / Timing Role: Direct LBO connection to audio amplifier enable pin to mute output and light LED warning at 2.0V. Use Value: Eliminates need for microcontroller polling; achieves deterministic, zero-software-overhead battery status signaling. |
Use Scenario: Legacy PDA with removable Li+ battery, where OS must suspend background tasks and disable backlight before shutdown. IC Role / Device Role / Timing Role: LBO tied to PMIC enable input to initiate controlled power sequencing when battery falls below 2.0V. Use Value: Ensures clean OS shutdown within 100ms of LBO assertion, avoiding filesystem corruption during unexpected power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428OSUR+T | Factory-trimmed 1.9V/2.6V thresholds (vs. 2.0V/2.7V); identical SOT23-3 package and push-pull output. | Better suited for lower-voltage alkaline/NiMH systems where earlier low-battery warning is preferred. | Select MAX6428OSUR+T if system must warn at 1.9V to preserve margin for voltage sag under load. |
| TLV7031DBVR | General-purpose nanopower comparator (600nA), requires external resistors for thresholds and hysteresis; no built-in timeout. | Demands additional design effort for accuracy, temperature drift compensation, and debounce logic. | Choose TLV7031DBVR only when custom threshold tuning or multi-level monitoring beyond two states is required. |
Compared with MAX6428OSUR+T, the MAX6429OSUR+T provides higher trip points for longer runtime in Li+ applications; compared with TLV7031DBVR, it delivers plug-and-play reliability with integrated timing and factory calibration - reducing validation time and BOM count.
Availability
MAX6429OSUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, electronic toys, and PDAs requiring stable component supply with long-term lifecycle support and RoHS-compliant packaging.
Supply support for MAX6429OSUR+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 calibrated voltage monitoring with minimal external components and guaranteed operation across industrial temperature ranges.
FAQ
What is the exact low-battery threshold voltage of the MAX6429OSUR+T?
The MAX6429OSUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.0V ±2.5%, meaning it asserts the LBO output when the BATT voltage falls below 1.95V to 2.05V. This value is laser-trimmed at wafer test and does not require external calibration. The MAX6429OSUR+T also features a corresponding high-threshold (VHTH) of 2.7V ±2.5% for hysteresis control.
Does the MAX6429OSUR+T require external components to operate?
No, the MAX6429OSUR+T requires no external components. As a factory-trimmed variant in the MAX6427–MAX6438 family, it integrates both comparators, 615mV reference, timing circuitry, and push-pull output driver. Only BATT, GND, and LBO connections are needed - making it a true "connect-and-go" solution for single-threshold battery monitoring.
Can the MAX6429OSUR+T operate down to 1.0V battery voltage?
Yes, the MAX6429OSUR+T guarantees valid LBO logic state operation down to BATT = 1.0V, per its Absolute Maximum Ratings and Electrical Characteristics table. This allows full discharge monitoring of Li+ cells (down to 2.5V) and alkaline/NiMH cells (down to 1.0V), ensuring reliable assertion even during deep depletion.
What is the purpose of the 140ms timeout period in the MAX6429OSUR+T?
The 140ms minimum timeout period in the MAX6429OSUR+T ensures the LBO output remains asserted for at least that duration after BATT rises above VHTH (2.7V), preventing premature deassertion during transient voltage recovery. This avoids chattering and false wakeups caused by load removal or battery rebound, enabling safe re-enablement of microprocessor or power-converter activity.
Is the MAX6429OSUR+T pin-compatible with other parts in the MAX6427–MAX6438 family?
The MAX6429OSUR+T uses the SOT23-3 package with BATT–LBO–GND pinout, matching MAX6427 and MAX6428 in the same package. However, it is not functionally pin-compatible with dual-output (SOT143-4) or adjustable-threshold (SOT23-5/SOT23-6) variants due to differing pin counts and functions - always verify pin mapping and output configuration before substitution.
MAX6429OSUR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6429OSUR+T FAQ
1.How can I place an order for MAX6429OSUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429OSUR+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 MAX6429OSUR+T reliable?
The price and inventory of MAX6429OSUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429OSUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429OSUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429OSUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429OSUR+T?
MAX6429OSUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429OSUR+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 MAX6429OSUR+T?
For technical support, including MAX6429OSUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429OSUR+T requirements.
6.How does Aetrix verify that MAX6429OSUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429OSUR+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 MAX6429OSUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429OSUR+T?
All MAX6429OSUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429OSUR+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 MAX6429OSUR+T part is unused and in its original packaging.
Return procedure for MAX6429OSUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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