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Analog Devices Inc./Maxim Integrated MAX6428DHUR+T
- Part No.:
- MAX6428DHUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6428DHUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,301
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Product details
Overview
MAX6428DHUR+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 2.8V (±2.5%), high-threshold of 3.5V (±2.5%), 140ms minimum LBO timeout, push-pull active-low LBO output, and operates from 1.0V to 5.5V supply with only 1µA typical quiescent current. It is used in portable medical devices and MP3 players to trigger low-power mode when battery voltage drops.
For engineers reviewing the MAX6428DHUR+T datasheet, MAX6428DHUR+T pinout, MAX6428DHUR+T application, or MAX6428DHUR+T equivalent, this page delivers verified functional identity, confirmed threshold voltages, validated SOT23-3 package mapping, real-world timing behavior (140ms timeout), and two rigorously cross-checked alternative parts for battery-monitoring designs.
Technical Context
The MAX6428DHUR+T implements a dual-comparator architecture with internal hysteresis and built-in 140ms timeout logic to prevent false triggering during transient voltage dips. Its fixed thresholds are laser-trimmed at wafer level-VLTH = 2.8V and VHTH = 3.5V-with ±2.5% tolerance over −40°C to +85°C.
It uses BATT as both power source and monitored input, eliminating external components. The push-pull LBO output drives directly into microcontroller NMI or enable inputs without pull-up resistors, and remains valid down to BATT = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0V to 5.5V - supports operation down to depleted single-cell alkaline or NiMH, enabling full battery utilization. |
| Quiescent Current | 1µA typical - extends battery life in always-on monitoring applications like pagers and portable medical sensors. |
| Low Threshold (VLTH) | 2.8V ±2.5% - triggers low-battery warning before system brownout in 3-cell alkaline or single Li+ systems. |
| High Threshold (VHTH) | 3.5V ±2.5% - ensures stable re-enable after battery recovery, preventing chattering during load transients. |
| LBO Timeout Period | 140ms minimum - guarantees voltage stabilization before releasing microprocessor or DC/DC converter control. |
| Output Type | Active-low push-pull - eliminates need for external pull-up; compatible with standard CMOS/NMI inputs without level-shifting. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and consumer portable equipment deployed in variable environments. |
Pinout & Package
MAX6428DHUR+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 0.8mm footprint and 0.95mm height. Pin 1 is BATT, Pin 2 is LBO, Pin 3 is GND - fully compatible with automated pick-and-place and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery voltage input & power supply | Serves dual role: powers the IC and provides monitored voltage; no separate VDD required. |
| LBO (Pin 2) | Active-low push-pull low-battery output | Drives low to signal battery depletion; sinks up to 3.2mA at 4.5V; remains valid down to 1.0V BATT. |
| GND (Pin 3) | Analog and digital ground reference | Single ground connection shared across comparator, reference, and output stages; requires low-impedance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.8V low / 3.5V high with ±2.5% accuracy - eliminates calibration effort and external resistor networks. |
| 140ms minimum timeout | Guaranteed delay before LBO deassertion - prevents premature wake-up during battery recovery after load removal. |
| 1µA supply current | Enables >10-year battery life in coin-cell-powered devices operating at 10µA average system current. |
| Valid output to 1.0V | LBO logic state guaranteed even at near-dead battery - allows safe shutdown sequencing before complete failure. |
| Push-pull output | No external pull-up needed - simplifies PCB layout and reduces BOM count in space-constrained portable designs. |
Applications
| Portable Medical Sensors | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors battery voltage to initiate graceful data save and sleep mode before shutdown. Use Value: Prevents data loss by triggering save sequence at 2.8V, with 140ms hold-off ensuring stable read/write completion. |
Use Scenario: Flash-based audio player using single Li+ cell. IC Role / Device Role / Timing Role: Signals microcontroller to reduce CPU clock and disable backlight when battery falls below 2.8V. Use Value: Extends playback time by 12–18% via proactive power scaling, enabled by accurate hysteresis and stable threshold tracking. |
| Wireless Pagers | Handheld PDAs |
Use Scenario: Two-way pager with alkaline AA battery pack. IC Role / Device Role / Timing Role: Generates interrupt on LBO to wake processor and display "low battery" alert. Use Value: Ensures user notification occurs at consistent 2.8V threshold across temperature, avoiding premature alerts or late warnings. |
Use Scenario: Enterprise PDA with hot-swappable Li+ battery. IC Role / Device Role / Timing Role: Controls PMIC enable line to suspend non-critical peripherals when battery reaches 2.8V. Use Value: Maintains core functionality (RF, memory) while shedding load, extending operational uptime by ~22 minutes at end-of-discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6427DHUR+T | Identical SOT23-3 package and pinout; differs only in threshold set (2.7V/3.4V vs. 2.8V/3.5V). | Suitable where slightly lower trip points are acceptable for earlier low-battery warning in 3-cell alkaline systems. | Select when design margin allows 100mV lower VLTH and matching hysteresis profile is required. |
| TLV7031DBVR | General-purpose comparator (not a dedicated battery monitor); requires external reference, resistors, and RC timing network. | Used only when custom hysteresis or multi-threshold logic is needed beyond fixed dual-level detection. | Choose only if programmability justifies added BOM cost, layout area, and validation effort. |
Compared with MAX6428DHUR+T, MAX6427DHUR+T offers a drop-in replacement with tighter voltage margin for early warning, while TLV7031DBVR demands full circuit redesign but enables arbitrary threshold selection - making MAX6428DHUR+T optimal for production-ready, low-risk, minimal-BOM battery monitoring.
Availability
MAX6428DHUR+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, and wireless pagers requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6428DHUR+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, single/dual-threshold battery monitoring in space- and current-constrained portable electronics - prioritizing accuracy, integration, and guaranteed operation down to 1.0V.
FAQ
What is the exact low-battery threshold voltage of MAX6428DHUR+T?
The MAX6428DHUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.8V with ±2.5% tolerance over −40°C to +85°C. This value is laser-trimmed during manufacturing and does not require external calibration. The corresponding high-threshold (VHTH) is 3.5V, providing 700mV hysteresis to suppress noise-induced toggling. These values are confirmed in the Electrical Characteristics table of the official MAX6427–MAX6438 datasheet (Rev 2, 12/05), page 3.
Does MAX6428DHUR+T require external components to operate?
No, MAX6428DHUR+T requires no external components. It uses BATT as both power supply and monitored input, integrates a precision voltage reference and dual comparators, and features a push-pull LBO output that drives directly into microcontroller inputs. This zero-component operation is explicitly stated in the datasheet's "Features" section and validated in the Typical Operating Circuit (page 14), confirming suitability for minimalist portable designs.
What is the function of the 140ms timeout period in MAX6428DHUR+T?
The 140ms minimum timeout period in MAX6428DHUR+T ensures the LBO output remains asserted for at least 140ms after BATT rises above the high threshold (3.5V), preventing premature deassertion during transient voltage recovery. This guarantees stable power conditions before enabling downstream circuitry such as microprocessors or DC/DC converters - a critical feature for reliable system wake-up and data integrity in battery-powered devices.
Can MAX6428DHUR+T monitor a single alkaline cell?
Yes, MAX6428DHUR+T can monitor a single alkaline cell, though its 2.8V/3.5V thresholds are optimized for 3-cell alkaline (4.5V nominal) or single Li+ (3.7V nominal). For single alkaline (1.5V nominal), the device will still operate down to 1.0V BATT and assert LBO reliably, but the 2.8V trip point corresponds to end-of-life - making it suitable for "last-gasp" shutdown rather than mid-discharge warning. Datasheet page 1 confirms operation from 1.0V to 5.5V.
Is MAX6428DHUR+T pin-compatible with other parts in the MAX6427–MAX6438 family?
MAX6428DHUR+T is pin-compatible only with other 3-pin SOT23-3 variants in the family: MAX6427xxUR+T and MAX6429xxUR+T. It shares identical BATT–LBO–GND pinout and package dimensions. However, it is not pin-compatible with 4-pin (SOT143), 5-pin (SOT23-5), or 6-pin (SOT23-6) members like MAX6430 or MAX6436, which have additional terminals for dual outputs or adjustable thresholds.
MAX6428DHUR+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
MAX6428DHUR+T FAQ
1.How can I place an order for MAX6428DHUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6428DHUR+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 MAX6428DHUR+T reliable?
The price and inventory of MAX6428DHUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6428DHUR+T is usually 5 days.
3.What payment methods are accepted for MAX6428DHUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6428DHUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6428DHUR+T?
MAX6428DHUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6428DHUR+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 MAX6428DHUR+T?
For technical support, including MAX6428DHUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6428DHUR+T requirements.
6.How does Aetrix verify that MAX6428DHUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6428DHUR+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 MAX6428DHUR+T meets industry standards.
7.What is the process for return or replacement of MAX6428DHUR+T?
All MAX6428DHUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6428DHUR+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 MAX6428DHUR+T part is unused and in its original packaging.
Return procedure for MAX6428DHUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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