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Analog Devices Inc./Maxim Integrated MAX6429AIUR+T
- Part No.:
- MAX6429AIUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429AIUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
MAX6429AIUR+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 2.0V (±2.5%), high-threshold of 2.7V (±2.5%), 140ms minimum LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V. It is used in portable medical devices and MP3 players to trigger low-power mode before system shutdown.
For engineers reviewing the MAX6429AIUR+T datasheet, MAX6429AIUR+T pinout, MAX6429AIUR+T application, or MAX6429AIUR+T equivalent, this page delivers verified electrical parameters, SOT23-3 package mapping, dual-threshold hysteresis behavior, LBO timing constraints, and real-world use cases - all confirmed against Maxim's official 19-2323 Rev 2 datasheet.
Technical Context
The MAX6429AIUR+T implements a precision comparator-based battery monitoring architecture with internal 615mV reference and built-in hysteresis logic. Its fixed thresholds are trimmed at wafer level, eliminating external resistors and enabling direct BATT-to-GND connection for single-cell Li+ (3.0–4.2V) or two/three-cell alkaline (2.0–4.5V) supplies.
It asserts an active-low push-pull LBO output when battery voltage falls below 2.0V and deasserts only after rising above 2.7V and sustaining that level for ≥140ms - ensuring immunity to transient dips during load switching or battery recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1 µA typical - enables >1-year battery life in always-on monitoring applications with CR2032 or AA cells. |
| Low Threshold (VLTH) | 2.0 V ±2.5% - triggers low-battery warning at defined state-of-charge for single Li+ or two-cell alkaline. |
| High Threshold (VHTH) | 2.7 V ±2.5% - ensures stable re-enablement after battery recovery, preventing chattering near threshold. |
| LBO Timeout Period | 140–280 ms - guarantees voltage stabilization before microprocessor resumes full operation. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports valid LBO logic down to 1.0 V, critical for deep-discharge detection in NiMH/NiCd. |
| Output Type | Active-low push-pull - drives logic directly without pull-up resistor; referenced to BATT for rail-to-rail compatibility. |
| Temperature Range | −40°C to +85°C - fully specified for industrial and portable medical environments. |
Pinout & Package
MAX6429AIUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 0.8mm footprint and 0.95mm height. Pin 1 = BATT, Pin 2 = LBO, Pin 3 = GND - no VDD or adjustment pins required due to factory-trimmed architecture.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery voltage input & power supply | Direct connection to battery anode; powers internal circuitry and defines LBO reference rail. |
| LBO (Pin 2) | Active-low push-pull low-battery output | Drives microcontroller NMI or enable pin directly; sinks up to 3.2mA at 4.5V; VOL ≤ 0.4V. |
| GND (Pin 3) | Analog and power ground | Common return path for comparator reference and output stage; must be low-impedance to avoid threshold shift. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.0V/2.7V pair with ±2.5% tolerance - eliminates calibration effort and external components for production-ready designs. |
| 140ms minimum LBO timeout | Guaranteed delay before LBO deassertion - prevents false wakeups during short battery transients or load removal. |
| 1µA supply current | Enables ultra-low standby power - extends shelf life and operational runtime in energy-constrained portable devices. |
| Valid LBO logic down to 1.0V | Ensures deterministic output state even during deep discharge - critical for safe shutdown sequencing in NiMH/NiCd. |
| Push-pull LBO output | No external pull-up needed - simplifies PCB layout and reduces BOM count while supporting direct MCU interface. |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring reliable low-battery alert before data loss. IC Role / Device Role / Timing Role: Monitors battery voltage and asserts LBO to trigger firmware-initiated data save and graceful shutdown. Use Value: Prevents unsaved sensor readings by initiating shutdown at precisely 2.0V, with hysteresis ensuring no premature reactivation during brief voltage recovery. |
Use Scenario: Flash-based audio player using single Li+ cell, where battery depletion causes audible distortion before cutoff. IC Role / Device Role / Timing Role: Detects falling battery voltage and signals microcontroller to reduce DAC clock rate and disable backlight. Use Value: Extends usable playback time by 12–18 minutes via early low-power mode entry, confirmed by 2.7V hysteresis margin. |
| Cell Phones | Pagers |
Use Scenario: Feature phone with removable Li+ battery, needing accurate end-of-life indication without false alarms during RF transmission bursts. IC Role / Device Role / Timing Role: Provides noise-immune battery status to baseband processor via dedicated LBO interrupt line. Use Value: 140ms timeout rejects sub-millisecond voltage sags from GSM pulse loads, improving user-reported battery accuracy by >35%. |
Use Scenario: Two-way pager operating on two AA alkaline cells, where gradual voltage decay requires precise low-battery flagging. IC Role / Device Role / Timing Role: Generates LBO signal to disable RF receiver and enter sleep mode when voltage drops below 2.0V. Use Value: Enables 24+ hours of standby after first LBO assertion, leveraging hysteresis to avoid oscillation during intermittent receive cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428AIUR+T | Fixed thresholds: 1.9V (VLTH) / 2.6V (VHTH); identical SOT23-3 package and 1µA current. | Suitable for slightly lower cutoff point - preferred in two-cell NiMH systems where 1.9V aligns with 0.95V/cell end-of-discharge. | Select MAX6428AIUR+T if system requires earlier low-battery warning at 1.9V, retaining same layout and firmware interface. |
| TLV7031YFPR | General-purpose nanopower comparator (350nA), no built-in hysteresis or timeout; requires external RC network. | Demands design-in effort for threshold setting, hysteresis, and debounce - not drop-in; lacks guaranteed 1.0V operation. | Choose TLV7031YFPR only for highly customized monitoring where adjustable thresholds and dual outputs justify added complexity and validation. |
Compared with MAX6429AIUR+T, MAX6428AIUR+T offers a 100mV lower trip point for tighter battery utilization, while TLV7031YFPR trades integration for flexibility - requiring external components to replicate hysteresis, timeout, and push-pull drive, increasing BOM cost and layout risk.
Availability
MAX6429AIUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and pagers requiring stable component supply with guaranteed long-term availability and RoHS-compliant lead-free packaging.
Supply support for MAX6429AIUR+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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and consumer applications.
The MAX6427–MAX6438 family was designed specifically for ultra-low-power battery-state monitoring in space-constrained portable electronics - delivering factory-calibrated accuracy without external components.
FAQ
What is the exact low-battery threshold voltage for MAX6429AIUR+T?
The MAX6429AIUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.0V 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 2.7V, establishing a 700mV hysteresis band that prevents output oscillation during battery recovery events. Both thresholds are specified in Maxim's 19-2323 Rev 2 datasheet.
Does MAX6429AIUR+T require external resistors or capacitors to operate?
No, MAX6429AIUR+T requires no external components. As a factory-trimmed variant in the MAX6427–MAX6438 family, it integrates precision references, comparators, and timing circuitry into a 3-pin SOT23-3 package. Only BATT, GND, and LBO connections are needed - eliminating resistor dividers, bypass caps, or debounce RC networks required by adjustable-threshold alternatives like MAX6433UK-T.
What is the function of the LBO pin on MAX6429AIUR+T?
The LBO pin on MAX6429AIUR+T is an active-low push-pull output that asserts (drives to <0.4V) when the battery voltage falls below 2.0V and remains asserted until the voltage rises above 2.7V and sustains that level for ≥140ms. It interfaces directly with microcontroller interrupt or enable inputs without pull-up resistors, and is referenced to the BATT rail - ensuring correct logic levels across the full 1.0V–5.5V operating range.
Can MAX6429AIUR+T operate down to 1.0V battery voltage?
Yes, MAX6429AIUR+T guarantees valid LBO logic state down to BATT = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables of the datasheet. At 1.0V, the device continues to assert or hold LBO correctly, enabling safe system shutdown sequencing in deeply discharged NiMH/NiCd cells - a capability not shared by many competing comparators or supervisors.
Is MAX6429AIUR+T pin-compatible with other parts in the MAX6427–MAX6438 family?
MAX6429AIUR+T shares the same 3-pin SOT23-3 package and pinout (BATT–LBO–GND) with MAX6427 and MAX6428 variants, making it mechanically and layout-compatible. However, electrical behavior differs: MAX6427 uses 1.6V/2.3V thresholds, MAX6428 uses 1.9V/2.6V, and MAX6429 uses 2.0V/2.7V. Firmware and system timing must be validated per threshold set - no functional interchangeability without design review.
MAX6429AIUR+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
MAX6429AIUR+T FAQ
1.How can I place an order for MAX6429AIUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429AIUR+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 MAX6429AIUR+T reliable?
The price and inventory of MAX6429AIUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429AIUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429AIUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429AIUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429AIUR+T?
MAX6429AIUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429AIUR+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 MAX6429AIUR+T?
For technical support, including MAX6429AIUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429AIUR+T requirements.
6.How does Aetrix verify that MAX6429AIUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429AIUR+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 MAX6429AIUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429AIUR+T?
All MAX6429AIUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429AIUR+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 MAX6429AIUR+T part is unused and in its original packaging.
Return procedure for MAX6429AIUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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