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Analog Devices Inc./Maxim Integrated MAX6429AJUR+T
- Part No.:
- MAX6429AJUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429AJUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
MAX6429AJUR+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 MAX6429AJUR+T datasheet, MAX6429AJUR+T pinout, MAX6429AJUR+T application, or MAX6429AJUR+T equivalent, this device supports precise single-level battery state detection with hysteresis, stable operation down to 1.0V supply, and direct interface to microprocessor NMI or power-enable logic without external components.
Technical Context
The MAX6429AJUR+T implements a dual-comparator architecture with internal 615mV reference and timing circuitry to enforce a 140ms minimum deassertion delay after voltage recovery. Its factory-trimmed thresholds eliminate resistor-divider networks and ensure consistent trip points across temperature (–40°C to +85°C).
It uses BATT as both power source and monitored input, with GND-referenced LBO output capable of sinking 3.2mA at 4.5V. The push-pull output drives directly to BATT rail, enabling robust interfacing with microcontrollers operating at same or lower supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1 µA typical - enables multi-year operation on coin cells or primary batteries. |
| Low Threshold (VLTH) | 2.9 V ±2.5% - triggers LBO assertion when single Li+ cell drops below usable voltage. |
| High Threshold (VHTH) | 3.1 V ±2.5% - ensures system remains disabled until battery recovers fully before re-enabling. |
| LBO Timeout Period | 140–280 ms - prevents false wakeups during transient voltage dips or load-induced sag. |
| Operating Voltage Range | 1.0 V to 5.5 V - supports operation down to near-dead battery (1.0V) while maintaining valid LBO logic state. |
| Output Type | Active-low push-pull - eliminates need for external pull-up; drives directly to MCU NMI or enable pin. |
| Temperature Range | –40°C to +85°C - qualified for industrial and portable consumer environments. |
Pinout & Package
MAX6429AJUR+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 | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BATT | Primary power supply and monitored battery voltage input; powers internal circuitry and sets comparator reference point. |
| 2 | LBO | Active-low push-pull output; asserts low when BATT < VLTH (2.9V), deasserts high after BATT > VHTH (3.1V) + 140ms timeout. |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V/3.1V pair with ±2.5% tolerance - eliminates calibration effort and external resistors for single-level monitoring. |
| Ultra-low quiescent current | 1 µA typical - extends battery life in always-on, low-duty-cycle applications like pagers and medical sensors. |
| Guaranteed LBO validity to 1.0V | Valid logic state maintained even as BATT decays to 1.0V - ensures reliable shutdown signaling at end-of-life. |
| 140ms minimum timeout | Hardware-enforced delay prevents chattering during battery recovery or load transients. |
| No external components required | Self-contained monitoring solution - reduces BOM count, PCB area, and design validation overhead. |
Applications
| Portable Medical Sensors | MP3 Players |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors battery voltage to trigger low-battery alert before sensor accuracy degrades. Use Value: Prevents data loss by initiating graceful shutdown at 2.9V, with hysteresis ensuring no false alerts during brief RF transmission dips. |
Use Scenario: Flash-based audio player using single Li+ cell. IC Role / Device Role / Timing Role: Signals microcontroller to enter sleep mode or display "low battery" when cell voltage falls below 2.9V. Use Value: Enables user-aware power management with deterministic 140ms recovery window before resuming playback. |
| Wireless Pagers | Electronic Toys |
|
Use Scenario: Two-way pager with alkaline AA battery pack. IC Role / Device Role / Timing Role: Drives LED indicator and disables RF receiver when battery drops below 2.9V. Use Value: Maintains reliable alerting down to 1.0V supply, avoiding premature cutoff in high-impedance alkaline discharge curve. |
Use Scenario: Interactive learning toy powered by two NiMH AA cells. IC Role / Device Role / Timing Role: Asserts LBO to disable motor drivers and audio amplifier when pack voltage falls below 2.9V. Use Value: Prevents brownout resets and erratic behavior by enforcing clean shutdown before logic rails collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428AJUR+T | Fixed thresholds: 2.8V low / 3.0V high - 100mV lower trip points than MAX6429AJUR+T. | Better suited for systems requiring earlier warning before Li+ cell reaches 3.0V knee region. | Select when earlier low-battery indication is needed without changing PCB layout. |
| TLV7031DBVR | General-purpose comparator with external reference; requires external resistors and hysteresis network. | Lacks integrated timeout, factory trimming, and guaranteed 1.0V operation - higher design complexity. | Choose only if custom threshold flexibility outweighs added component count and qualification effort. |
Compared with MAX6428AJUR+T and TLV7031DBVR, the MAX6429AJUR+T offers tighter factory-set thresholds, guaranteed sub-1.0V functional operation, and zero external components - making it optimal for cost-sensitive, space-constrained, and production-ready battery-powered designs.
Availability
MAX6429AJUR+T is available at Aetrix Electronics and suitable for portable medical sensors, MP3 players, wireless pagers, and electronic toys requiring stable component supply and long-term lifecycle support.
Supply support for MAX6429AJUR+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 precision analog, mixed-signal, and power management ICs for industrial, medical, and consumer applications.
The MAX6427–MAX6438 family was designed to deliver ultra-low-power, pin-compatible battery monitoring solutions for space- and energy-constrained portable electronics - eliminating external components while guaranteeing performance across full industrial temperature range.
FAQ
What is the exact low-battery threshold voltage for MAX6429AJUR+T?
The MAX6429AJUR+T has a factory-trimmed low-threshold voltage (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 resistor networks. The corresponding high-threshold (VHTH) is 3.1V, providing 200mV hysteresis to prevent output oscillation during battery recovery.
Does MAX6429AJUR+T support operation below 1.6V supply?
Yes, MAX6429AJUR+T guarantees valid LBO logic state down to BATT = 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. This allows reliable shutdown signaling even as the battery discharges into its final flat region - critical for maximizing usable capacity in primary and rechargeable chemistries.
Is MAX6429AJUR+T pin-compatible with other parts in the MAX6427–MAX6438 family?
MAX6429AJUR+T shares the same 3-pin SOT23-3 package and pinout (BATT–LBO–GND) with MAX6427 and MAX6428 variants. However, it is not pin-compatible with 4-pin (SOT143), 5-pin (SOT23-5), or 6-pin (SOT23-6) members of the family, which include dual outputs or adjustable thresholds and different pin assignments.
What output drive capability does the LBO pin of MAX6429AJUR+T provide?
The LBO pin of MAX6429AJUR+T is a push-pull output capable of sinking up to 3.2mA at 4.5V (VOL ≤ 0.4V) and sourcing 200µA at 1.6V (VOH ≥ 0.8×VSUPPLY). This allows direct connection to microcontroller NMI inputs, enable pins, or LEDs without external pull-ups or buffers.
Can MAX6429AJUR+T be used with alkaline or NiMH battery packs?
Yes, MAX6429AJUR+T is explicitly specified for use with single Li+, two-cell, or three-cell alkaline/NiCd/NiMH supplies. Its 2.9V/3.1V thresholds align with the nominal 3.0V–3.2V range of fresh two-cell alkaline or NiMH packs, enabling accurate end-of-discharge detection before voltage collapse.
MAX6429AJUR+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
MAX6429AJUR+T FAQ
1.How can I place an order for MAX6429AJUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429AJUR+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 MAX6429AJUR+T reliable?
The price and inventory of MAX6429AJUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429AJUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429AJUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429AJUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429AJUR+T?
MAX6429AJUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429AJUR+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 MAX6429AJUR+T?
For technical support, including MAX6429AJUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429AJUR+T requirements.
6.How does Aetrix verify that MAX6429AJUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429AJUR+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 MAX6429AJUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429AJUR+T?
All MAX6429AJUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429AJUR+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 MAX6429AJUR+T part is unused and in its original packaging.
Return procedure for MAX6429AJUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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