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Analog Devices Inc./Maxim Integrated MAX6429CJUR+T
- Part No.:
- MAX6429CJUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429CJUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
The MAX6429CJUR+T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and alkaline/NiMH/NiCd systems. It features a fixed low-threshold of 2.9V (±2.5%), high-threshold of 3.0V (±2.5%), 140ms LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V - enabling reliable low-battery detection in portable medical devices and MP3 players.
For engineers reviewing the MAX6429CJUR+T datasheet, MAX6429CJUR+T pinout, MAX6429CJUR+T application, or MAX6429CJUR+T equivalent, this page delivers verified electrical parameters, SOT23-3 package mapping, dual-threshold hysteresis behavior, and real-world use cases for battery-state signaling in ultra-low-power embedded systems.
Technical Context
The MAX6429CJUR+T implements a precision comparator-based architecture with internal 615mV reference and factory-laser-trimmed thresholds. Its dual-voltage monitoring detects battery "good" (BATT ≥ 3.0V), "weak" (BATT between 2.9V–3.0V), and "empty" (BATT < 2.9V) states using a single open-drain LBO output with guaranteed valid logic down to BATT = 1.0V.
It integrates a 140ms minimum timeout circuit that prevents premature re-enabling after transient voltage recovery, and includes immunity to short battery transients. The device draws only 1µA at 3.7V and requires no external components - making it suitable for space-constrained, long-life battery-powered applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1 µA typical at 3.7V - enables >10-year battery life in coin-cell applications. |
| Low Threshold (VLTH) | 2.9 V ±2.5% - triggers LBO assertion when single Li+ cell drops below safe operating voltage. |
| High Threshold (VHTH) | 3.0 V ±2.5% - deasserts LBO only after battery recovers above stable operating level. |
| LBO Timeout Period | 140–280 ms - ensures system power-up occurs only after supply stabilization post-load removal. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports operation down to near-dead battery (1.0V) while maintaining valid LBO state. |
| Output Type | Active-low open-drain LBO - allows pull-up to any voltage ≤5.5V, independent of BATT or VDD. |
| Temperature Range | −40°C to +85°C - fully specified for industrial and portable consumer environments. |
Pinout & Package
MAX6429CJUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 1.45mm max height. Pin 1 = BATT, Pin 2 = LBO, Pin 3 = GND - compatible with standard SOT23 pick-and-place tooling and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery voltage input & power supply | Direct connection to battery anode; powers internal circuitry and serves as reference for threshold comparison. |
| LBO (Pin 2) | Active-low open-drain low-battery output | Sinks current when asserted; requires external pull-up; logic valid down to BATT = 1.0V. |
| GND (Pin 3) | Analog and digital ground reference | Common return path for internal comparators, reference, and output stage; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V/3.0V pair with ±2.5% tolerance - eliminates calibration effort and external resistor networks. |
| Ultra-low quiescent current | 1 µA typical - extends shelf life and runtime in always-on battery monitoring circuits. |
| Open-drain LBO output | Pull-up voltage independent of BATT - enables interface to 1.8V/3.3V/5V microcontrollers without level shifters. |
| 140ms minimum timeout | Guaranteed delay before LBO deassertion - prevents chattering during battery voltage recovery. |
| No external components required | Self-contained monitoring solution - reduces BOM count, PCB area, and design validation time. |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors battery voltage to trigger low-power mode at 2.9V and disable system at <2.9V with 140ms hysteresis. Use Value: Prevents data loss during battery depletion while extending usable runtime via early warning. |
Use Scenario: Flash-based audio player using single Li+ cell. IC Role / Device Role / Timing Role: Generates LBO signal to initiate graceful shutdown before brownout resets MCU. Use Value: Eliminates corrupted firmware writes and file system corruption during power collapse. |
| Electronic Toys | PDAs |
Use Scenario: Voice-recording toy with alkaline AA batteries. IC Role / Device Role / Timing Role: Detects weak battery condition (2.9V) to reduce motor speed and backlight brightness. Use Value: Maintains user experience continuity while conserving remaining capacity. |
Use Scenario: Handheld PDA with integrated Li+ pack and real-time clock. IC Role / Device Role / Timing Role: Signals battery depletion to save RAM contents and enter deep sleep before power loss. Use Value: Ensures data integrity and fast resume after battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428CJUR+T | Fixed thresholds: 2.8V/2.9V (100mV lower hysteresis window) | Better suited for lower-voltage alkaline/NiMH systems where 2.8V cutoff is preferred | Select when tighter low-threshold margin is needed for two-cell alkaline operation. |
| TLV7031YFPR | Single comparator with 1.24V reference; requires external resistors for threshold setting | Higher design flexibility but adds BOM cost, layout area, and calibration complexity | Choose only if programmable thresholds and wider voltage range (1.6V–6.5V) outweigh added component count. |
Compared with MAX6429CJUR+T, MAX6428CJUR+T offers a lower trip point for earlier low-battery warning in marginal alkaline systems, while TLV7031YFPR trades factory accuracy and zero-component simplicity for full threshold configurability - making MAX6429CJUR+T optimal for production-ready, cost-sensitive, fixed-threshold designs.
Availability
MAX6429CJUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, electronic toys, and PDAs requiring stable component supply across extended product lifecycles.
Supply support for MAX6429CJUR+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) is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX6427–MAX6438 family was designed specifically for ultra-low-power, single/dual-threshold battery monitoring in space- and energy-constrained portable electronics - prioritizing accuracy, integration, and ease of use over programmability.
FAQ
What is the exact low-battery threshold voltage of the MAX6429CJUR+T?
The MAX6429CJUR+T has a factory-trimmed low-threshold (VLTH) of 2.9V with ±2.5% tolerance over −40°C to +85°C. This value is laser-trimmed during production and does not require external calibration. The corresponding high-threshold (VHTH) is 3.0V, establishing a 100mV hysteresis band to prevent output oscillation near the trip point. Both thresholds are referenced to the BATT pin.
Does the MAX6429CJUR+T require external resistors or capacitors to operate?
No, the MAX6429CJUR+T requires no external components. Its thresholds are factory-trimmed, its 615mV internal reference is integrated, and its 140ms timeout is implemented on-die. Only three connections are needed: BATT (Pin 1), LBO (Pin 2, with external pull-up), and GND (Pin 3). This zero-component requirement simplifies layout and improves reliability in high-volume portable designs.
Can the MAX6429CJUR+T operate when the battery voltage drops below 1.6V?
Yes, the MAX6429CJUR+T guarantees valid LBO logic state down to BATT = 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.0V, the device remains functional and will assert LBO if the voltage falls below the 2.9V threshold (though that condition cannot occur below 2.9V - the key point is that internal logic remains stable and predictable even at near-dead battery voltages).
What is the function of the LBO pin on the MAX6429CJUR+T?
The LBO pin on the MAX6429CJUR+T is an active-low, open-drain output that asserts (pulls low) when the BATT voltage falls below the 2.9V threshold. It remains asserted for a minimum of 140ms after BATT rises above 3.0V. Because it is open-drain, it requires an external pull-up resistor to a logic-compatible voltage (≤5.5V), enabling flexible interfacing with diverse host processors regardless of their I/O voltage.
Is the MAX6429CJUR+T pin-compatible with other devices in the MAX6427–MAX6438 family?
No - the MAX6429CJUR+T uses a 3-pin SOT23-3 package (BATT/LBO/GND), whereas dual-output variants like MAX6430CJUS+T use 4-pin SOT143-4, and adjustable-threshold versions like MAX6433EUK+T use 5-pin SOT23-5. Pin count, pinout, and functionality differ across sub-families; direct substitution requires matching package type, pin count, and output configuration.
MAX6429CJUR+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
MAX6429CJUR+T FAQ
1.How can I place an order for MAX6429CJUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429CJUR+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 MAX6429CJUR+T reliable?
The price and inventory of MAX6429CJUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429CJUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429CJUR+T?
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4.How is shipping managed for MAX6429CJUR+T?
MAX6429CJUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429CJUR+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 MAX6429CJUR+T?
For technical support, including MAX6429CJUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429CJUR+T requirements.
6.How does Aetrix verify that MAX6429CJUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429CJUR+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 MAX6429CJUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429CJUR+T?
All MAX6429CJUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429CJUR+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 MAX6429CJUR+T part is unused and in its original packaging.
Return procedure for MAX6429CJUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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