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Analog Devices Inc./Maxim Integrated MAX6429NRUR+T
- Part No.:
- MAX6429NRUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429NRUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
MAX6429NRUR+T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and alkaline/NiMH/NiCd cells. It features a fixed low-threshold of 2.9V (±2.5%), high-threshold of 3.1V (±2.5%), 140ms 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 when battery voltage drops below threshold.
For engineers reviewing the MAX6429NRUR+T datasheet, MAX6429NRUR+T pinout, MAX6429NRUR+T application, or MAX6429NRUR+T equivalent, this page delivers verified electrical parameters, SOT23-3 package details, hysteresis behavior, LBO timing characteristics, and real-world implementation guidance for battery-state signaling in ultra-low-power systems.
Technical Context
The MAX6429NRUR+T implements a dual-comparator architecture with internal 615mV reference, comparing battery voltage against factory-trimmed upper (3.1V) and lower (2.9V) thresholds. Its hysteresis is fixed at 200mV (≈6.5% of 3.1V), eliminating external components and preventing chatter during battery recovery.
It asserts an active-low push-pull LBO output when BATT falls below 2.9V and deasserts only after BATT rises above 3.1V and remains stable for ≥140ms. Guaranteed valid LBO logic state is maintained down to BATT = 1.0V, enabling reliable operation near end-of-life battery conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1 µA typical - enables multi-year operation on coin-cell batteries without significant drain. |
| Operating Voltage Range | 1.0V to 5.5V - supports full discharge profiling of single Li+ (2.7–4.2V) and 2–3-cell alkaline (1.0–4.5V). |
| Low Threshold (VLTH) | 2.9V ±2.5% - factory-trimmed trip point for initiating low-power system mode. |
| High Threshold (VHTH) | 3.1V ±2.5% - factory-trimmed release point ensuring stable re-enablement after voltage recovery. |
| LBO Timeout Period | 140–280 ms - prevents false triggers during transient load-induced voltage sag. |
| Output Type | Active-low push-pull - drives logic directly without pull-up resistor; referenced to BATT. |
| Temperature Range | −40°C to +85°C - fully specified for industrial and portable consumer environments. |
Pinout & Package
MAX6429NRUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), 1.42mm × 2.92mm × 1.1mm, with gull-wing leads and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input & power supply | Primary analog input and VDD source; monitors cell voltage and powers internal circuitry. |
| 2 - LBO | Active-low battery status output | Push-pull output asserted low when BATT < 2.9V; deasserted high after BATT > 3.1V + 140ms timeout. |
| 3 - GND | Analog and digital ground reference | Common return path for comparator inputs, reference, and output stage; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V/3.1V pair eliminates calibration effort and external resistors - reduces BOM count and layout area. |
| 140ms minimum timeout | Ensures LBO deassertion only after sustained voltage recovery - prevents premature wake-up during pulsed loads. |
| 1µA supply current | Enables integration into always-on battery monitoring paths without compromising standby life. |
| Valid LBO down to 1.0V | Guarantees deterministic output state even at near-dead battery - critical for safe shutdown sequencing. |
| Immunity to short transients | Rejects sub-100µs voltage dips (e.g., from RF bursts or switching noise) - improves system robustness. |
Applications
| Portable Medical Sensors | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors battery health and triggers sleep mode when voltage drops to 2.9V, extending operational life before replacement. Use Value: Prevents unexpected shutdown during measurement; maintains data logging integrity via controlled low-power transition. |
Use Scenario: Flash-based audio player using single Li+ cell (3.0–4.2V range). IC Role / Device Role / Timing Role: Generates LBO signal to reduce CPU clock and disable backlight when battery reaches 2.9V. Use Value: Extends playback time by 12–18% through adaptive power scaling before final shutdown at 2.7V. |
| Wireless Remote Controls | Handheld Barcode Scanners |
Use Scenario: IR remote with alkaline AA cells operating down to 1.0V per cell. IC Role / Device Role / Timing Role: Detects weak battery condition (2.9V on 3-cell stack) and disables RF transmission to conserve remaining capacity. Use Value: Avoids failed command transmission while preserving enough energy for basic button response and LED feedback. |
Use Scenario: Industrial-grade scanner powered by 2×AA NiMH pack (1.8–2.8V). IC Role / Device Role / Timing Role: Asserts LBO at 2.9V to halt motor-driven scan head and enter low-power wait state. Use Value: Eliminates mechanical wear from incomplete scans and ensures consistent decode success on last charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428NRUR+T | Fixed thresholds: 2.8V (LTH) / 3.0V (HTH); 100mV hysteresis vs. MAX6429NRUR+T's 200mV. | Suitable where earlier low-battery warning is needed (e.g., systems requiring longer grace period before shutdown). | Select when tighter hysteresis and lower trip points better match battery discharge curve and system response latency. |
| TLV7031YFPR | General-purpose nanopower comparator (650nA), no built-in hysteresis or timeout - requires external RC network. | Demands PCB area and design effort for timing/hysteresis; lacks guaranteed 1.0V operation and factory calibration. | Choose only if custom threshold tuning or multi-rail monitoring is required; otherwise MAX6429NRUR+T offers superior integration and reliability. |
Compared with MAX6428NRUR+T and TLV7031YFPR, the MAX6429NRUR+T provides the widest hysteresis (200mV), highest trip points (2.9V/3.1V), and zero-component operation - making it optimal for Li+-based systems needing robust, maintenance-free battery state detection without design overhead.
Availability
MAX6429NRUR+T is available at Aetrix Electronics and suitable for portable medical sensors, MP3 players, wireless remotes, and handheld barcode scanners requiring stable component supply across extended production lifecycles.
Supply support for MAX6429NRUR+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 low-power, high-reliability solutions.
The MAX6427–MAX6438 family was engineered specifically for battery-state monitoring in space-constrained, ultra-low-power portable electronics - delivering calibrated thresholds, integrated timing, and guaranteed operation down to 1.0V.
FAQ
What is the exact low-battery threshold voltage of MAX6429NRUR+T?
The MAX6429NRUR+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 calibration. The corresponding high-threshold (VHTH) is 3.1V, yielding a fixed 200mV hysteresis band essential for noise immunity in battery-powered systems.
Does MAX6429NRUR+T require external resistors or capacitors to operate?
No, the MAX6429NRUR+T requires no external components. Its thresholds, hysteresis, and 140ms timeout are fully integrated and factory-trimmed. Only three connections are needed: BATT, GND, and LBO. This eliminates BOM cost, layout complexity, and calibration risk - distinguishing it from user-adjustable variants like MAX6433/MAX6434.
Can MAX6429NRUR+T operate reliably when battery voltage drops below 1.5V?
Yes, the MAX6429NRUR+T guarantees valid LBO logic states down to BATT = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and outputs deterministic high/low states even at end-of-discharge voltages common in alkaline and NiMH cells - enabling safe, predictable system shutdown.
What is the output configuration of MAX6429NRUR+T, and how is it interfaced?
The MAX6429NRUR+T features an active-low push-pull LBO output referenced to BATT. It drives directly to logic-low (<0.4V at 3.2mA sink) or logic-high (≥0.8 × BATT at 800µA source) without external pull-ups. This allows direct connection to microcontroller NMI or GPIO pins, simplifying interface design and reducing power loss versus open-drain alternatives.
How does the 140ms timeout in MAX6429NRUR+T improve system stability?
The 140ms minimum timeout ensures the MAX6429NRUR+T holds LBO asserted until BATT remains above 3.1V for that duration, preventing false deassertion during transient voltage recoveries caused by load removal or switching noise. This avoids erratic system wake-up cycles and guarantees stable power-converter or processor enablement only after true battery stabilization.
MAX6429NRUR+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
MAX6429NRUR+T FAQ
1.How can I place an order for MAX6429NRUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429NRUR+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 MAX6429NRUR+T reliable?
The price and inventory of MAX6429NRUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429NRUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429NRUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429NRUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429NRUR+T?
MAX6429NRUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429NRUR+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 MAX6429NRUR+T?
For technical support, including MAX6429NRUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429NRUR+T requirements.
6.How does Aetrix verify that MAX6429NRUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429NRUR+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 MAX6429NRUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429NRUR+T?
All MAX6429NRUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429NRUR+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 MAX6429NRUR+T part is unused and in its original packaging.
Return procedure for MAX6429NRUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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