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Analog Devices Inc./Maxim Integrated MAX6429MRUR-T
- Part No.:
- MAX6429MRUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429MRUR-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX6429MRUR-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 2.7V (±2.5%), high-threshold of 3.4V (±2.5%), 140ms minimum LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V supply. It delivers active-low push-pull LBO output for direct microprocessor NMI or system shutdown control in portable medical devices and pagers.
For engineers reviewing the MAX6429MRUR-T datasheet, MAX6429MRUR-T pinout, MAX6429MRUR-T application, or MAX6429MRUR-T equivalent, this page provides verified threshold values, SOT23-3 package details, timeout behavior, logic configuration, and real-world use cases - all confirmed from Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6429MRUR-T implements a dual-comparator hysteresis architecture with internal 615mV reference, comparing battery voltage against factory-laser-trimmed thresholds. Its LBO output asserts when BATT falls below VLTH (2.7V) and deasserts only after BATT rises above VHTH (3.4V) and sustains ≥140ms timeout - preventing false triggers during transient load recovery.
It draws just 1µA at 3.7V, supports operation down to 1.0V battery voltage with guaranteed valid LBO logic state, and uses push-pull output referenced to BATT - eliminating external pull-up and enabling direct interface to µP NMI inputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1µA typical at 3.7V - enables >10-year battery life in always-on monitoring applications. |
| Low Threshold (VLTH) | 2.7V ±2.5% - factory-trimmed to detect weak Li+ cell before brownout in single-cell systems. |
| High Threshold (VHTH) | 3.4V ±2.5% - ensures stable re-enablement after battery recovery; 700mV hysteresis prevents chatter. |
| LBO Timeout Period | 140–280ms - guarantees system power or µP activity resumes only after supply stabilization. |
| Operating Voltage Range | 1.0V to 5.5V - supports full discharge monitoring of Li+ (3.0–4.2V) and alkaline (0.9–1.5V/cell × 2–3). |
| Output Type | Active-low push-pull - drives NMI or enable pins directly; no external pull-up required. |
| Temperature Range | −40°C to +85°C - fully specified for industrial and portable medical environments. |
Pinout & Package
MAX6429MRUR-T is housed in a 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 automated placement and reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input & power supply | Supplies device and serves as monitored rail; supports operation down to 1.0V with valid LBO logic. |
| 2 - LBO | Active-low push-pull output | Drives µP NMI or system enable directly; sinks 3.2mA at 4.5V; no external components needed. |
| 3 - GND | Analog/digital ground reference | Common return for comparator reference and output stage; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.7V low / 3.4V high with ±2.5% tolerance - eliminates calibration effort and external resistor networks. |
| 140ms minimum LBO timeout | Guaranteed delay before deassertion - prevents premature wake-up during battery voltage bounce after load removal. |
| 1µA supply current | Enables decade-scale battery runtime in coin-cell-powered devices like pagers and glucose meters. |
| Push-pull LBO output | Direct-drive capability for µP NMI or enable inputs - removes need for pull-up resistors and saves board space. |
| Valid LBO logic to 1.0V | Ensures reliable shutdown signaling even at end-of-life battery voltage - critical for data retention safety. |
Applications
| Portable Medical Devices | Pagers |
|---|---|
|
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 calibration fails. Use Value: Prevents erroneous glucose readings by initiating graceful shutdown at 2.7V, preserving last valid measurement. |
Use Scenario: Two-way alphanumeric pager using single Li+ cell. IC Role / Device Role / Timing Role: Generates NMI signal to µP when battery drops below 2.7V, forcing display dimming and RF sleep. Use Value: Extends usable runtime by 18% via early low-power mode entry, confirmed in Maxim AN5242. |
| Cell Phones | Electronic Toys |
|
Use Scenario: Feature phone with removable Li+ battery and basic PMIC. IC Role / Device Role / Timing Role: Drives PMIC EN pin to disable non-critical subsystems (backlight, audio) at 2.7V. Use Value: Avoids sudden shutdown during call - maintains voice path until 2.5V via hysteresis margin. |
Use Scenario: Remote-controlled toy car powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Asserts LBO to MCU to reduce motor PWM duty cycle and disable LED effects at 2.7V. Use Value: Delivers consistent user experience across battery life; prevents erratic behavior during voltage sag under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428MRUR-T | Fixed thresholds: VLTH = 2.6V, VHTH = 3.3V - 100mV lower trip points than MAX6429MRUR-T. | Better suited for systems requiring earlier low-battery warning (e.g., hearing aids with tighter voltage margins). | Select when design requires 2.6V/3.3V thresholds instead of 2.7V/3.4V; same SOT23-3 package and push-pull output. |
| TLV7031DBVR | General-purpose comparator (no built-in hysteresis or timeout); requires external RC network for debounce. | Demands PCB area for timing components and precision resistors; lacks guaranteed 140ms delay or 1µA quiescent current. | Choose only if custom threshold tuning is mandatory; adds design complexity and reduces reliability vs. factory-trimmed solution. |
Compared with MAX6429MRUR-T, MAX6428MRUR-T offers identical functionality with shifted thresholds for tighter battery-margin designs, while TLV7031DBVR requires external circuitry to approximate hysteresis and timeout - increasing BOM count and validation effort.
Availability
MAX6429MRUR-T is available at Aetrix Electronics and suitable for portable medical devices, pagers, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed performance.
Supply support for MAX6429MRUR-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 battery state monitoring in space-constrained portable electronics - prioritizing sub-µA quiescent current, factory-trimmed accuracy, and integrated timeout logic.
FAQ
What is the exact low-battery threshold voltage of MAX6429MRUR-T?
The MAX6429MRUR-T has a factory-trimmed low-threshold voltage (VLTH) of 2.7V ±2.5%, meaning it asserts LBO when battery voltage falls below 2.63V (min) and deasserts only after rising above 3.4V ±2.5% (3.315V min) and sustaining ≥140ms. This value is laser-trimmed and documented in Maxim's datasheet Table 1 for "MR" suffix variants.
Does MAX6429MRUR-T require external components to operate?
No, MAX6429MRUR-T requires no external components. Its factory-trimmed thresholds, internal 615mV reference, push-pull LBO driver, and 140ms timeout circuit are fully integrated. Only BATT, GND, and LBO connections are needed - making it ideal for minimal-footprint designs like pagers and hearing aids.
Can MAX6429MRUR-T operate down to 1.0V battery voltage?
Yes, MAX6429MRUR-T guarantees valid LBO logic state down to BATT = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. At 1.0V, the device remains functional and correctly asserts/deasserts LBO - a key feature for end-of-life detection in primary battery systems.
What is the output configuration of MAX6429MRUR-T?
MAX6429MRUR-T features an active-low push-pull LBO output (Pin 2), referenced to BATT. It actively drives low (≤0.4V at 3.2mA) and actively drives high (≥0.8×BATT at 800µA), eliminating the need for external pull-up resistors and enabling direct connection to µP NMI or enable inputs.
Is MAX6429MRUR-T pin-compatible with other MAX6427–MAX6429 variants?
Yes, all MAX6427/MAX6428/MAX6429 variants share identical SOT23-3 pinout (BATT–LBO–GND) and push-pull output configuration. Only threshold voltages differ - e.g., MAX6427DH uses 2.3V/3.3V, MAX6429MR uses 2.7V/3.4V - allowing drop-in replacement when thresholds match design requirements.
MAX6429MRUR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- 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
MAX6429MRUR-T FAQ
1.How can I place an order for MAX6429MRUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429MRUR-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 MAX6429MRUR-T reliable?
The price and inventory of MAX6429MRUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429MRUR-T is usually 5 days.
3.What payment methods are accepted for MAX6429MRUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429MRUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429MRUR-T?
MAX6429MRUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429MRUR-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 MAX6429MRUR-T?
For technical support, including MAX6429MRUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429MRUR-T requirements.
6.How does Aetrix verify that MAX6429MRUR-T is sourced from the original manufacturer or authorized distributors?
All MAX6429MRUR-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 MAX6429MRUR-T meets industry standards.
7.What is the process for return or replacement of MAX6429MRUR-T?
All MAX6429MRUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429MRUR-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 MAX6429MRUR-T part is unused and in its original packaging.
Return procedure for MAX6429MRUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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