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Analog Devices Inc./Maxim Integrated MAX6429PQUR+T
- Part No.:
- MAX6429PQUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429PQUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,297
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Product details
Overview
MAX6429PQUR+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 2.0V (±2.5%), high-threshold of 2.7V (±2.5%), 140ms LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V. It asserts an active-low push-pull LBO when battery voltage falls below 2.0V and deasserts after rising above 2.7V - used in portable medical devices to trigger low-power mode before shutdown.
For engineers reviewing the MAX6429PQUR+T datasheet, MAX6429PQUR+T pinout, MAX6429PQUR+T application, or MAX6429PQUR+T equivalent, key selection criteria include factory-set hysteresis (0.7V), guaranteed LBO validity down to BATT = 1.0V, immunity to short voltage transients, and compatibility with SOT23-3 footprint for space-constrained battery-powered designs.
Technical Context
The MAX6429PQUR+T implements a dual-comparator architecture with internal 615mV reference, hysteresis timing logic, and push-pull output driver - all integrated into a 3-pin SOT23 package. Its threshold trip points are laser-trimmed at wafer level, eliminating external resistors and ensuring ±2.5% accuracy over −40°C to +85°C.
It uses a 140ms minimum timeout period after voltage recovery to prevent premature system wake-up during battery rebound. The LBO output remains valid and functional even as supply drops to 1.0V, enabling reliable brown-out signaling in deeply discharged states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0V to 5.5V - supports operation down to near-dead battery (1.0V), critical for end-of-life detection in single-cell Li+ systems. |
| Quiescent Current | 1µA (typ) - enables multi-year battery life in always-on monitoring applications like pagers or remote sensors. |
| Low Threshold (VLTH) | 2.0V ±2.5% - factory-trimmed trip point indicating "weak battery"; triggers low-power mode in host MCU. |
| High Threshold (VHTH) | 2.7V ±2.5% - factory-trimmed recovery point; ensures stable re-enablement after battery voltage recovers. |
| LBO Timeout Period | 140ms (min) - prevents chattering during transient dips; guarantees stable output state before MCU resumes full operation. |
| Output Type | Active-low push-pull - drives directly to BATT rail without pull-up resistor; simplifies PCB layout and reduces component count. |
| Operating Temperature | −40°C to +85°C - fully specified for industrial and consumer portable equipment across environmental extremes. |
Pinout & Package
MAX6429PQUR+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 ultra-compact battery management in handheld devices.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BATT | Battery voltage input and primary power supply; monitors voltage and powers internal circuitry - must be connected directly to battery terminal. |
| 2 | LBO | Active-low push-pull low-battery output; sinks current when asserted (≤0.3V @ 100µA); drives MCU NMI or enable logic without external components. |
| 3 | GND | Analog/digital ground reference; requires low-impedance connection to system ground plane to maintain threshold accuracy and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.0V low / 2.7V high with ±2.5% tolerance - eliminates calibration effort and external resistor networks for consistent, production-ready performance. |
| 140ms minimum timeout | Guaranteed delay before LBO deassertion - prevents false wake-up during battery voltage recovery after load removal. |
| 1µA supply current | Ultra-low quiescent draw - extends shelf life and runtime in battery-backed SRAM, real-time clocks, and emergency alert systems. |
| Valid LBO down to 1.0V | Functional output assertion at BATT = 1.0V - enables last-chance system save or graceful shutdown before complete power loss. |
| Push-pull LBO output | Direct-drive capability to BATT rail - removes need for external pull-up, reducing BOM count and board area in size-sensitive designs. |
Applications
| Portable Medical Devices | Cell Phones / Cordless Phones |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring precise low-battery warning before clinical measurement interruption. IC Role / Device Role: Single-point voltage supervisor triggering MCU-initiated data save and LCD dimming at 2.0V. Use Value: Prevents data loss during measurement by asserting LBO 700mV above cutoff, allowing >140ms for safe state capture before shutdown. |
Use Scenario: Feature phones with removable Li+ batteries needing reliable low-battery indication prior to forced power-off. IC Role / Device Role: Primary battery status monitor interfacing directly with baseband processor's NMI input. Use Value: Push-pull LBO eliminates external pull-up, saving 0.3mm² PCB area per unit - critical in high-volume compact phone designs. |
| Pagers | Electronic Toys |
Use Scenario: Two-way pagers operating on single AA/AAA alkaline cells where battery depletion must be signaled before message loss. IC Role / Device Role: Low-voltage detector enabling sleep-mode entry and LED blink pattern change at 2.0V. Use Value: 1µA quiescent current extends standby time beyond 5 years - meeting long-shelf-life requirements for consumer paging units. |
Use Scenario: Voice-enabled learning toys powered by two alkaline cells requiring audible low-battery alerts before motor stall. IC Role / Device Role: System-level battery health indicator driving audio controller to play "low battery" voice prompt. Use Value: Immunity to 100µs transients prevents false alerts during motor commutation spikes - improving user experience reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428PUK+T | Same SOT23-3 package; factory-trimmed 1.9V/2.6V thresholds (vs. 2.0V/2.7V); identical 1µA current and 140ms timeout. | Suitable for systems requiring earlier low-battery warning - triggers at 100mV lower VLTH, useful in higher-load alkaline applications. | Select MAX6428PUK+T when earlier warning margin is needed; verify system behavior at 1.9V vs. 2.0V trip point. |
| TLV7031DBVR | Single comparator with 1.24V reference; requires external resistors for threshold setting; 650nA supply current but no built-in hysteresis or timeout. | Requires design-in of RC timing network and dual-resistor divider - increases BOM, layout area, and calibration risk. | Choose TLV7031DBVR only if programmable thresholds are mandatory; MAX6429PQUR+T offers superior integration and accuracy out-of-box. |
Compared with MAX6428PUK+T and TLV7031DBVR, MAX6429PQUR+T delivers optimal balance of precision (±2.5%), zero-component simplicity, and guaranteed 140ms debounce - making it the preferred choice for cost-sensitive, high-reliability single-threshold battery monitoring.
Availability
MAX6429PQUR+T is available at Aetrix Electronics and suitable for portable medical devices, cell phones, pagers, and electronic toys requiring stable component supply and long-term manufacturability.
Supply support for MAX6429PQUR+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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6427–MAX6438 family was designed specifically for ultra-low-power, high-accuracy battery voltage supervision in space- and energy-constrained portable electronics - emphasizing factory-trimmed precision, minimal external components, and robust transient immunity.
FAQ
What is the exact low-battery threshold voltage for MAX6429PQUR+T?
The MAX6429PQUR+T has a factory-trimmed low-threshold (VLTH) of 2.0V ±2.5%, meaning it asserts the LBO output when the BATT voltage falls below 1.95V to 2.05V. This value is laser-trimmed during manufacturing and does not require external calibration - confirmed in Maxim's MAX6427–MAX6438 datasheet Table 1 (PQ code corresponds to 2.0V/2.7V pair).
Does MAX6429PQUR+T require any external components to operate?
No, MAX6429PQUR+T requires zero external components. Its thresholds are factory-trimmed, its 140ms timeout is internal, and its push-pull LBO output drives directly to BATT. Only three connections - BATT, GND, and LBO - are needed, making it ideal for minimalist battery monitoring in size-constrained designs.
Can MAX6429PQUR+T operate with a single-cell Li+ battery that discharges down to 2.5V?
Yes, MAX6429PQUR+T operates across 1.0V to 5.5V, fully covering the 2.5V–4.2V range of a single-cell Li+ battery. Its 2.0V VLTH and 2.7V VHTH provide appropriate hysteresis for early low-battery warning while ensuring reliable deassertion during recharge - validated over −40°C to +85°C.
What is the function of the LBO pin on MAX6429PQUR+T?
The LBO pin on MAX6429PQUR+T is an active-low push-pull output that asserts (drives low) when BATT falls below 2.0V and remains asserted for ≥140ms after BATT rises above 2.7V. It interfaces directly with MCU interrupt pins or enable inputs without pull-up resistors - confirmed in Pin Description and Typical Operating Circuit sections of the datasheet.
Is MAX6429PQUR+T compatible with alkaline/NiMH battery packs?
Yes, MAX6429PQUR+T is explicitly qualified for two- or three-cell alkaline/NiCd/NiMH supplies. Its 2.0V/2.7V thresholds align with the nominal 3.0V (2×1.5V) or 4.5V (3×1.5V) ranges, providing accurate weak/empty detection - as stated in Applications and General Description sections of the MAX6427–MAX6438 datasheet.
MAX6429PQUR+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
MAX6429PQUR+T FAQ
1.How can I place an order for MAX6429PQUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429PQUR+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 MAX6429PQUR+T reliable?
The price and inventory of MAX6429PQUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429PQUR+T is usually 5 days.
3.What payment methods are accepted for MAX6429PQUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429PQUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429PQUR+T?
MAX6429PQUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429PQUR+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 MAX6429PQUR+T?
For technical support, including MAX6429PQUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429PQUR+T requirements.
6.How does Aetrix verify that MAX6429PQUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6429PQUR+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 MAX6429PQUR+T meets industry standards.
7.What is the process for return or replacement of MAX6429PQUR+T?
All MAX6429PQUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429PQUR+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 MAX6429PQUR+T part is unused and in its original packaging.
Return procedure for MAX6429PQUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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