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Analog Devices Inc./Maxim Integrated MAX6429CGUR+T
- Part No.:
- MAX6429CGUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429CGUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,898
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Product details
Overview
MAX6429CGUR+T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and alkaline/NiMH/NiCd cells, featuring 2.0V low-threshold, 2.7V high-threshold, 140ms LBO timeout, ±2.5% threshold accuracy over –40°C to +85°C, and push-pull active-low LBO output - used to trigger system low-power mode or shutdown in portable medical devices and MP3 players.
For engineers reviewing the MAX6429CGUR+T datasheet, MAX6429CGUR+T pinout, MAX6429CGUR+T application, or MAX6429CGUR+T equivalent, this page delivers verified electrical specs, SOT23-3 package mapping, dual-threshold hysteresis behavior, LBO timing constraints, and real-world substitution guidance for battery-state monitoring designs.
Technical Context
The MAX6429CGUR+T implements a precision comparator-based battery monitor with internal 615mV reference, fixed hysteresis between VLTH = 2.0V and VHTH = 2.7V, and guaranteed valid LBO logic state down to BATT = 1.0V. It operates from 1.0V to 5.5V supply and consumes only 1µA typical quiescent current.
Its push-pull LBO output drives directly to BATT rail, eliminating external pull-up requirements, and incorporates a 140ms minimum timeout to prevent false triggering during transient voltage recovery - critical for stable operation in load-switched battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0V to 5.5V - supports full discharge monitoring of single Li+ (2.7–4.2V) and two-cell alkaline (1.0–3.0V) |
| Low Threshold (VLTH) | 2.0V ±2.5% - triggers LBO assertion at defined weak-battery condition for system power-down initiation |
| High Threshold (VHTH) | 2.7V ±2.5% - requires BATT rise above this level before LBO deassertion, enabling hysteresis control |
| LBO Timeout Period | 140–280ms - ensures stable voltage recovery before re-enabling microprocessor or DC/DC converter |
| Quiescent Current | 1µA typical - enables multi-year operation in coin-cell-powered devices without compromising runtime |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable medical environments with wide ambient variation |
| LBO Output Type | Active-low push-pull - sinks up to 3.2mA at 4.5V; no external pull-up required; referenced to BATT |
Pinout & Package
MAX6429CGUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input & power supply | Primary supply rail; powers internal circuitry and sets comparator reference point; monitored for threshold crossing |
| 2 - LBO | Active-low push-pull low-battery output | Drives low (≤0.4V @ 3.2mA) when BATT < 2.0V; returns high (≥0.8×BATT) after 140ms delay when BATT > 2.7V |
| 3 - GND | Analog/digital ground reference | Common return path for internal comparators, timing circuitry, and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.0V/2.7V pair with ±2.5% tolerance - eliminates calibration effort and external resistor networks |
| 1µA supply current | Enables >10-year battery life in 20mAh coin-cell applications operating at 1Hz wake-up intervals |
| 140ms LBO timeout | Prevents chattering during battery voltage rebound after load removal - avoids spurious system resets |
| Valid LBO down to 1.0V | Ensures deterministic shutdown signaling even at end-of-life battery voltage, improving safety margin |
| Push-pull LBO output | Direct drive capability removes need for external pull-up resistors - reduces BOM count and layout area |
Applications
| Portable Medical Sensors | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring precise low-battery warning before sensor data loss. IC Role / Device Role / Timing Role: Monitors cell voltage decay; asserts LBO at 2.0V to initiate graceful shutdown and EEPROM save sequence. Use Value: Prevents data corruption by ensuring 2.7V hysteresis allows safe recovery window before disabling RF transmission. |
Use Scenario: Flash-based audio player using single Li+ cell, where battery depletion causes audible distortion before cutoff. IC Role / Device Role / Timing Role: Triggers firmware-controlled sleep mode at 2.0V and disables audio codec at 1.8V via secondary logic. Use Value: Extends usable playback time by 12% versus fixed-threshold monitors lacking hysteresis. |
| Wireless Pagers | Electronic Toys |
Use Scenario: Two-way pager with alkaline AA batteries, needing reliable "low battery" alert before message loss during receive bursts. IC Role / Device Role / Timing Role: Drives LED indicator and disables RF receiver when BATT falls below 2.0V; resets only after 140ms stabilization above 2.7V. Use Value: Eliminates false alerts caused by momentary voltage sag during TX burst, improving user confidence. |
Use Scenario: Motorized learning toy powered by two NiMH AA cells, requiring early low-voltage detection to preserve motor torque. IC Role / Device Role / Timing Role: Asserts LBO to reduce PWM duty cycle at 2.0V, maintaining motion responsiveness until 1.6V cutoff. Use Value: Delivers consistent playtime across charge cycles by tracking actual usable voltage range, not nominal rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428DGUR+T | Factory-trimmed 1.9V/2.6V thresholds (vs. 2.0V/2.7V); identical SOT23-3 package and 1µA current | Suitable for tighter low-voltage margin designs where earlier warning at 1.9V is preferred | Select when system brown-out threshold is set at 1.95V and requires earlier intervention than MAX6429CGUR+T |
| TLV7031DBVR | General-purpose nanopower comparator (600nA), no built-in hysteresis or timeout; requires external RC network | Demands PCB area for hysteresis components and firmware timing logic - increases design complexity | Choose only if custom threshold tuning or multi-level monitoring beyond dual-state is required |
Compared with MAX6429CGUR+T, MAX6428DGUR+T offers lower trip points for earlier warning but same reliability and footprint, while TLV7031DBVR adds design overhead for hysteresis and timing - making MAX6429CGUR+T optimal for drop-in, low-risk battery-state signaling.
Availability
MAX6429CGUR+T is available at Aetrix Electronics and suitable for portable medical sensors, MP3 players, wireless pagers, and electronic toys requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6429CGUR+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 focus on ultra-low-power and high-reliability solutions.
MAX6429CGUR+T belongs to the MAX6427–MAX6438 family of battery monitors engineered specifically for single/dual-level state detection in space- and power-constrained portable electronics.
FAQ
What is the exact low-battery threshold voltage for MAX6429CGUR+T?
The MAX6429CGUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.0V ±2.5% and high-threshold voltage (VHTH) of 2.7V ±2.5%, measured across –40°C to +85°C. These values define the hysteresis band within which the LBO output transitions, and are laser-trimmed during production - no external adjustment is possible. The MAX6429CGUR+T uses these fixed thresholds to reliably signal battery weakness without calibration.
Does MAX6429CGUR+T require external components to operate?
No, MAX6429CGUR+T requires no external components for basic operation. Its factory-trimmed thresholds, internal 615mV reference, and push-pull LBO output eliminate the need for resistors, capacitors, or pull-up networks. Only BATT, GND, and LBO connections are mandatory - simplifying layout and reducing BOM cost. The MAX6429CGUR+T is designed for immediate integration into battery-powered systems with minimal supporting circuitry.
What is the minimum battery voltage at which MAX6429CGUR+T guarantees valid LBO logic state?
MAX6429CGUR+T guarantees valid LBO logic state down to BATT = 1.0V, per its Absolute Maximum Ratings and Electrical Characteristics table. This ensures deterministic shutdown signaling even at end-of-discharge voltage for primary cells or deeply depleted rechargeables. The MAX6429CGUR+T maintains functional comparators and output drivers across this full range, enabling safe system termination before catastrophic failure.
Can MAX6429CGUR+T monitor two-cell alkaline batteries?
Yes, MAX6429CGUR+T is explicitly qualified for two-cell alkaline/NiCd/NiMH monitoring, as confirmed in Tables 1 and 2 of its datasheet. Its 2.0V/2.7V thresholds align with the nominal 3.0V and recovered 2.8V operating range of fresh alkaline pairs, providing accurate weak/empty indication across temperature and load. The MAX6429CGUR+T delivers consistent performance whether monitoring single Li+ or multicell primary chemistries.
What package type and lead finish does MAX6429CGUR+T use?
MAX6429CGUR+T uses a 3-pin SOT23-3 package (JEDEC MO-178AA) with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. Its dimensions are 1.3mm × 2.9mm × 0.95mm, and it is supplied in tape-and-reel format only. The MAX6429CGUR+T's compact footprint and green packaging meet IPC/JEDEC standards for automated assembly and environmental compliance.
MAX6429CGUR+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
MAX6429CGUR+T FAQ
1.How can I place an order for MAX6429CGUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429CGUR+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 MAX6429CGUR+T reliable?
The price and inventory of MAX6429CGUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429CGUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429CGUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429CGUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429CGUR+T?
MAX6429CGUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429CGUR+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 MAX6429CGUR+T?
For technical support, including MAX6429CGUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429CGUR+T requirements.
6.How does Aetrix verify that MAX6429CGUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429CGUR+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 MAX6429CGUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429CGUR+T?
All MAX6429CGUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429CGUR+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 MAX6429CGUR+T part is unused and in its original packaging.
Return procedure for MAX6429CGUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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