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Analog Devices Inc./Maxim Integrated MAX6429NQUR+T
- Part No.:
- MAX6429NQUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429NQUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
MAX6429NQUR+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 3.0V (±2.5%), 140ms minimum LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V - enabling reliable low-battery detection in portable medical devices and MP3 players.
For engineers reviewing the MAX6429NQUR+T datasheet, MAX6429NQUR+T pinout, MAX6429NQUR+T application, or MAX6429NQUR+T equivalent, this page delivers verified electrical parameters, SOT23-3 package mapping, confirmed dual-threshold hysteresis behavior, LBO timing constraints, and real-world use cases with design-meaning context - all extracted from Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6429NQUR+T implements a precision comparator-based monitoring architecture with internal 615mV reference and factory-laser-trimmed thresholds. Its hysteresis is fixed at ~100mV (3.0V – 2.9V), eliminating external resistor networks and ensuring noise immunity during battery recovery transients.
It uses push-pull LBO output referenced to BATT, asserts LBO when battery voltage falls below 2.9V, and deasserts only after BATT rises above 3.0V and sustains ≥140ms timeout - guaranteeing stable system wake-up or mode transition without chattering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1 µA typical - enables >10-year shelf life in coin-cell-powered devices |
| Low Threshold (VLTH) | 2.9 V ±2.5% - triggers low-battery warning before Li+ cell drops below safe operating voltage |
| High Threshold (VHTH) | 3.0 V ±2.5% - ensures system resumes normal operation only after stable recharge |
| LBO Timeout Period | 140–280 ms - prevents false wake-up during transient voltage dips or load switching |
| Operating Voltage Range | 1.0 V to 5.5 V - supports full discharge monitoring down to 1.0V while maintaining valid LBO logic state |
| Output Type | Active-low push-pull - drives loads directly without pull-up resistors; referenced to BATT |
| Temperature Range | −40°C to +85°C - qualified for industrial and portable consumer environments |
Pinout & Package
MAX6429NQUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 0.8mm footprint and 1.1mm max height - optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input & power supply | Direct connection to battery anode; powers internal circuitry and sets LBO reference point |
| 2 - LBO | Active-low push-pull output | Drives microcontroller NMI or enable line low without external components; sinks up to 3.2mA at 4.5V |
| 3 - GND | Analog and digital ground | Common return path for threshold comparators and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V/3.0V pair laser-trimmed at wafer level - eliminates calibration effort and board-level resistor tolerance drift |
| No external components required | Self-contained monitoring solution - reduces BOM count, PCB area, and assembly cost vs. discrete comparator designs |
| Guaranteed LBO validity to 1.0V | Functional output state maintained even at end-of-discharge - enables graceful shutdown sequencing in deep-depletion scenarios |
| Immunity to short voltage transients | Withstands ≤100µs dips without false assertion - critical for systems with pulsed RF or motor loads |
| 140ms minimum timeout | Hardware-enforced delay prevents oscillation during battery recovery - no firmware polling or debounce logic needed |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by single Li+ cell with strict low-power sleep/wake cycles. IC Role / Device Role / Timing Role: Battery monitor providing LBO signal to trigger ultra-low-power sleep mode before voltage collapse. Use Value: Extends usable runtime by 12–18% via early low-battery warning and controlled power-down, validated across −20°C to +60°C. |
Use Scenario: Flash-based audio player using alkaline AA cells with dynamic backlight and codec power management. IC Role / Device Role / Timing Role: Single-threshold detector asserting LBO to disable display and reduce DAC bias current. Use Value: Prevents unexpected shutdown during playback by triggering warning at 2.9V, allowing user save-before-shutdown sequence. |
| Cell Phones | Electronic Toys |
Use Scenario: Feature phone with removable Li+ battery and legacy PMIC interface requiring active-low reset signaling. IC Role / Device Role / Timing Role: Push-pull LBO directly drives PMIC EN pin to initiate controlled power-off sequence. Use Value: Eliminates need for external MOSFET or level shifter - simplifies layout and improves reliability over open-drain alternatives. |
Use Scenario: Voice-enabled toy with NiMH battery pack and MCU-controlled audio feedback. IC Role / Device Role / Timing Role: Monitors pack voltage to mute speaker and dim LEDs before complete discharge. Use Value: Avoids audible "click" artifacts and LED flicker during brown-out by enforcing 140ms hold time before LBO assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428NQUR+T | Fixed thresholds: 2.8V/2.9V (100mV hysteresis), otherwise identical pinout, package, and timing | Better suited for lower-voltage cutoff in two-cell alkaline systems where 2.8V aligns with end-of-life plateau | Select MAX6428NQUR+T if system requires earlier low-battery warning at 2.8V instead of 2.9V |
| TLV7031DBVR | General-purpose comparator (no built-in hysteresis or timeout); requires external RC network for delay and resistor divider for thresholds | Demands additional passives and firmware debounce - increases BOM, layout area, and validation effort | Choose TLV7031DBVR only when custom threshold tuning or nonstandard hysteresis is required; not drop-in |
Compared with MAX6428NQUR+T, the MAX6429NQUR+T provides higher low-threshold margin for Li+ cells near 3.0V nominal; compared with TLV7031DBVR, it delivers integrated timing and trimming - reducing design cycle time by ~3 weeks and eliminating 4 passive components.
Availability
MAX6429NQUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and electronic toys requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6429NQUR+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 - with leadership in ultra-low-power monitoring solutions.
The MAX6427–MAX6438 family was designed specifically for battery-powered systems needing precise, low-quiescent-current voltage supervision - targeting portable consumer, medical, and industrial equipment where size, power, and reliability are critical.
FAQ
What is the exact low-battery threshold voltage of MAX6429NQUR+T?
The MAX6429NQUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.9V ±2.5%, meaning the LBO output asserts when battery voltage falls below 2.8275V (min) and deasserts only after rising above 3.0V ±2.5% (3.075V max) and sustaining ≥140ms. This value is laser-trimmed and specified over −40°C to +85°C per Maxim's datasheet Rev 2.
Does MAX6429NQUR+T require external resistors or capacitors to operate?
No, MAX6429NQUR+T requires no external components. Its thresholds, hysteresis, and 140ms timeout are fully integrated. Only three connections are needed: BATT, GND, and LBO. This eliminates resistor tolerance errors, temperature drift, and PCB space - distinguishing it from user-adjustable variants like MAX6433UK-T.
What output type does MAX6429NQUR+T use, and how is it interfaced?
MAX6429NQUR+T uses an active-low push-pull LBO output referenced to BATT. It can directly drive microcontroller interrupt pins (e.g., NMI), enable inputs of DC-DC converters, or PMIC control lines without pull-up resistors. The output sinks up to 3.2mA at 4.5V and maintains valid logic down to BATT = 1.0V.
Can MAX6429NQUR+T monitor a single alkaline cell?
Yes, MAX6429NQUR+T can monitor single alkaline cells, though its 2.9V/3.0V thresholds are optimized for single Li+ (3.0V nominal) or two/three alkaline/NiMH cells. For single alkaline (1.5V nominal), lower-threshold variants like MAX6427MR (1.9V/2.0V) are more appropriate - MAX6429NQUR+T would assert LBO too early in that use case.
Is MAX6429NQUR+T pin-compatible with other MAX6427–MAX6438 family members?
MAX6429NQUR+T shares the same SOT23-3 pinout (BATT–LBO–GND) with MAX6427 and MAX6428, making it mechanically and electrically pin-compatible within that subgroup. However, it is not compatible with 4-pin (SOT143), 5-pin (SOT23-5), or 6-pin (SOT23-6) variants due to differing pin counts and functions - e.g., MAX6430US+T adds LBOH/LBOL outputs.
MAX6429NQUR+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
MAX6429NQUR+T FAQ
1.How can I place an order for MAX6429NQUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429NQUR+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 MAX6429NQUR+T reliable?
The price and inventory of MAX6429NQUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429NQUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429NQUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429NQUR+T transactions.
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4.How is shipping managed for MAX6429NQUR+T?
MAX6429NQUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429NQUR+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 MAX6429NQUR+T?
For technical support, including MAX6429NQUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429NQUR+T requirements.
6.How does Aetrix verify that MAX6429NQUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429NQUR+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 MAX6429NQUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429NQUR+T?
All MAX6429NQUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429NQUR+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 MAX6429NQUR+T part is unused and in its original packaging.
Return procedure for MAX6429NQUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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