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Analog Devices Inc./Maxim Integrated MAX6429CIUR+T
- Part No.:
- MAX6429CIUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429CIUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
MAX6429CIUR+T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and multi-cell alkaline/NiMH/NiCd systems. It features a fixed low-threshold of 2.9V (±2.5%), high-threshold of 3.1V (±2.5%), 140ms minimum LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V. It delivers active-low push-pull LBO output to signal battery depletion in portable medical devices and MP3 players.
For engineers reviewing the MAX6429CIUR+T datasheet, MAX6429CIUR+T pinout, MAX6429CIUR+T application, or MAX6429CIUR+T equivalent, this page provides verified threshold values, SOT23-3 package mapping, LBO timing behavior, and direct alternatives for battery-state monitoring in ultra-low-power embedded systems.
Technical Context
The MAX6429CIUR+T implements a dual-comparator architecture with internal 615mV reference and hysteresis logic to detect battery voltage crossing of factory-set thresholds. Its LBO output remains asserted for ≥140ms after BATT rises above VHTH, ensuring stable system wake-up only after supply stabilization.
It draws just 1µA at 3.7V and guarantees valid LBO logic state down to BATT = 1.0V. The device uses BiCMOS process, requires no external components, and interfaces directly to microprocessor NMI or enable inputs via push-pull output referenced to BATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1µA typical at 3.7V - enables multi-year operation on coin cells or small Li+ batteries. |
| Low Threshold (VLTH) | 2.9V ±2.5% - triggers LBO assertion when single Li+ cell drops below safe operating voltage. |
| High Threshold (VHTH) | 3.1V ±2.5% - deasserts LBO only after battery recovers to nominal charge level. |
| LBO Timeout Period | 140–280ms - prevents false wake-up during transient voltage dips or load-induced sag. |
| Operating Voltage Range | 1.0V to 5.5V - supports full discharge monitoring of single Li+, NiMH, or alkaline cells. |
| Output Type | Active-low push-pull - drives logic directly without pull-up resistor; referenced to BATT. |
| Temperature Range | -40°C to +85°C - qualified for industrial and portable consumer environments. |
Pinout & Package
MAX6429CIUR+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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BATT) | Battery voltage input and power supply | Direct connection to battery anode; powers internal circuitry and references LBO output. |
| 2 (LBO) | Active-low push-pull low-battery output | Drives microcontroller NMI or enable pin low without external pull-up; sinks up to 3.2mA. |
| 3 (GND) | Analog and digital ground reference | Common return path for comparator inputs and output stage; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V/3.1V pair with ±2.5% tolerance - eliminates calibration effort and external resistors. |
| Ultra-low quiescent current | 1µA typical - extends battery life in always-on monitoring applications like pagers and PDAs. |
| Guaranteed LBO validity to 1.0V | Functional output down to BATT = 1.0V - supports full-depth discharge detection in alkaline/NiMH systems. |
| 140ms minimum timeout | Hardware-enforced delay ensures stable voltage before enabling power converters or CPUs. |
| Immunity to short transients | Rejects <100µs voltage spikes - avoids spurious LBO assertion during switching noise or ESD events. |
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 decay to trigger low-power mode at 2.9V and disable system at 2.7V (via hysteresis). Use Value: Prevents unexpected shutdown during critical measurement cycles using deterministic 140ms timeout and 1µA draw. |
Use Scenario: Flash-based audio player with single Li+ cell and USB charging. IC Role / Device Role / Timing Role: Asserts LBO to suspend playback and enter sleep when cell voltage falls below 2.9V. Use Value: Enables graceful data save and display dimming before shutdown, improving user experience. |
| Cell Phones | Pagers |
Use Scenario: Feature phone with GSM module and Li+ battery. IC Role / Device Role / Timing Role: Signals battery weakness (2.9V) to initiate RF power reduction and backlight dimming. Use Value: Extends talk time by 12–18% through proactive power management before deep discharge. |
Use Scenario: Two-way pager using AA alkaline cells with intermittent receive duty cycle. IC Role / Device Role / Timing Role: Triggers alert LED and disables receiver when battery drops to 2.9V. Use Value: Maintains message reception reliability across full battery life with no false alerts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428CIUR+T | Factory-trimmed 2.8V/3.0V thresholds (vs. 2.9V/3.1V); identical SOT23-3 package and 1µA current. | Suitable where earlier low-battery warning is required - e.g., systems needing margin before 3.0V brownout. | Select MAX6428CIUR+T if design requires lower trip point while retaining same timing, output, and layout. |
| TLV7031DBVR | Single comparator with 1.24V reference; requires external resistors for threshold setting; 650nA supply current. | Offers programmable thresholds but adds BOM cost and layout area; lacks built-in hysteresis and timeout logic. | Choose TLV7031DBVR only when adjustable thresholds are mandatory and system can implement external timing. |
Compared with MAX6429CIUR+T, MAX6428CIUR+T provides earlier warning at lower voltage with identical form/fit/function, while TLV7031DBVR trades integration for flexibility-requiring external components to achieve comparable hysteresis and timing behavior.
Availability
MAX6429CIUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and pagers requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6429CIUR+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 in industrial, automotive, and consumer markets.
The MAX6427–MAX6438 family was engineered specifically for ultra-low-power battery-state monitoring in space-constrained portable electronics, emphasizing zero external components, guaranteed sub-1V operation, and robust transient immunity.
FAQ
What is the exact low-battery threshold voltage of MAX6429CIUR+T?
The MAX6429CIUR+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 3.1V, also ±2.5%, defining the hysteresis window used by MAX6429CIUR+T to prevent chattering near trip points.
Does MAX6429CIUR+T require external resistors or capacitors to operate?
No, MAX6429CIUR+T requires no external components. It integrates a precision 615mV reference, dual comparators, hysteresis logic, and 140ms timeout circuitry. Only three connections are needed: BATT, GND, and LBO. This simplifies PCB layout and reduces BOM count - a key advantage of MAX6429CIUR+T over adjustable-threshold alternatives.
What is the function of the LBO pin on MAX6429CIUR+T?
The LBO pin on MAX6429CIUR+T is an active-low push-pull output that asserts (drives low) when BATT falls below 2.9V and remains asserted for ≥140ms after BATT rises above 3.1V. It interfaces directly with microcontroller NMI, reset, or enable inputs without pull-up resistors. MAX6429CIUR+T's LBO is referenced to BATT, supporting operation even as supply decays to 1.0V.
Can MAX6429CIUR+T monitor a two-cell alkaline battery pack?
Yes, MAX6429CIUR+T can monitor two-cell alkaline (2.4–3.2V fresh) or NiMH (2.4–2.8V) packs. Its 2.9V/3.1V thresholds align with end-of-life detection for such configurations. The device guarantees valid LBO logic down to BATT = 1.0V, allowing full discharge tracking. For tighter 2-cell alkaline matching, MAX6428CIUR+T (2.8V/3.0V) is also offered in the same SOT23-3 package as MAX6429CIUR+T.
What package type and lead finish does MAX6429CIUR+T use?
MAX6429CIUR+T uses a 3-pin SOT23-3 package (JEDEC MO-178AA) with lead-free (Pb-free) finish, indicated by the "+T" suffix. It measures 1.3mm × 2.9mm with 1.45mm max height and is supplied in tape-and-reel format. The "CIUR" prefix denotes commercial temperature grade (-40°C to +85°C) and SOT23-3 body, confirming mechanical and thermal compatibility with MAX6429CIUR+T's datasheet specifications.
MAX6429CIUR+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
MAX6429CIUR+T FAQ
1.How can I place an order for MAX6429CIUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429CIUR+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 MAX6429CIUR+T reliable?
The price and inventory of MAX6429CIUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429CIUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429CIUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429CIUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429CIUR+T?
MAX6429CIUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429CIUR+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 MAX6429CIUR+T?
For technical support, including MAX6429CIUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429CIUR+T requirements.
6.How does Aetrix verify that MAX6429CIUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429CIUR+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 MAX6429CIUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429CIUR+T?
All MAX6429CIUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429CIUR+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 MAX6429CIUR+T part is unused and in its original packaging.
Return procedure for MAX6429CIUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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