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Analog Devices Inc./Maxim Integrated MAX6428EIUR+T
- Part No.:
- MAX6428EIUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6428EIUR+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6428EIUR+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, and push-pull active-low LBO output in SOT23-3 package - used to trigger system low-power mode when battery voltage drops below threshold.
For engineers reviewing the MAX6428EIUR+T datasheet, MAX6428EIUR+T pinout, MAX6428EIUR+T application, or MAX6428EIUR+T equivalent, this device serves as a precision, ultra-low-current (1µA typ) battery health indicator with guaranteed valid logic down to 1.0V supply and immunity to short voltage transients in portable medical devices, pagers, and MP3 players.
Technical Context
The MAX6428EIUR+T implements a dual-comparator architecture with internal 615mV reference and fixed hysteresis (ΔV ≈ 0.7V), where VLTH = 2.0V and VHTH = 2.7V are factory-trimmed thresholds. It monitors BATT directly as both power source and input signal, eliminating external components.
Its push-pull LBO output drives active-low logic referenced to BATT, asserting when BATT falls below 2.0V and deasserting only after BATT rises above 2.7V and sustains for ≥140ms - ensuring stable detection during battery recovery after load removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.0V to 5.5V - supports operation down to depleted single-cell alkaline (1.0V) while maintaining valid LBO state. |
| Supply Current (typ) | 1µA at 3.7V - enables multi-year battery life in always-on monitoring applications. |
| Low Threshold (VLTH) | 2.0V ±2.5% - factory-trimmed trip point for initiating low-power system mode. |
| High Threshold (VHTH) | 2.7V ±2.5% - factory-trimmed release point with 140ms minimum timeout before LBO deassertion. |
| LBO Output Type | Active-low push-pull - provides rail-to-rail drive without external pull-up; compatible with microcontroller NMI or reset inputs. |
| Temperature Range | -40°C to +85°C - fully specified for industrial and portable consumer environments. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint ideal for space-constrained handhelds. |
Pinout & Package
SOT23-3 package: 3-pin surface-mount, lead-free, moisture-sensitive level 1 (MSL1), JEDEC-compliant outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BATT | Battery voltage input & power supply | Direct connection to battery anode; powers IC and serves as monitored signal - no external regulator needed. |
| 2 - LBO | Active-low push-pull output | Drives low (≤0.3V @ 100µA) when BATT < 2.0V; drives high (≥0.8×BATT) when BATT > 2.7V post-timeout. |
| 3 - GND | Ground reference | Common return for BATT supply and LBO output; must be low-impedance to ensure accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.0V/2.7V pair with ±2.5% tolerance - eliminates resistor-divider design effort and board area for single-level detection. |
| 140ms minimum LBO timeout | Guaranteed delay prevents false deassertion during transient voltage recovery after load removal. |
| 1µA typical supply current | Enables >10-year shelf life in coin-cell–powered devices like medical sensors and remote controls. |
| Valid LBO logic to 1.0V BATT | Ensures deterministic output state even during deep discharge - critical for safe system shutdown sequencing. |
| Immunity to short voltage transients | Rejects ≤10µs spikes up to 100mV overdrive - avoids spurious low-battery assertions in noisy portable environments. |
Applications
| Portable Medical Sensors | Pagers |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell operating for 12+ months between replacements. IC Role / Device Role / Timing Role: Battery monitor asserts LBO to trigger BLE transmission of low-battery alert and enter deep-sleep mode. Use Value: Prevents unexpected shutdown during measurement; extends usable battery life by avoiding premature disable. |
Use Scenario: Two-cell alkaline–powered alphanumeric pager requiring reliable end-of-life warning before message loss. IC Role / Device Role / Timing Role: MAX6428EIUR+T detects voltage sag under RF transmit load and initiates audible/visual low-battery indication. Use Value: Eliminates need for software-based voltage sampling, reducing MCU wake cycles and power consumption. |
| MP3 Players | Electronic Toys |
Use Scenario: Flash-memory–based audio player using single Li+ cell with dynamic load ranging from 5mA (playback) to 150mA (headphone amp). IC Role / Device Role / Timing Role: LBO output disables audio codec and backlight when BATT falls below 2.0V, preserving residual charge for graceful shutdown. Use Value: Avoids file corruption during abrupt power loss by enabling controlled firmware save before cutoff. |
Use Scenario: Voice-recording toy powered by two AA alkaline cells, requiring clear "replace batteries" cue before voice playback fails. IC Role / Device Role / Timing Role: Drives LED blink pattern via LBO to indicate weak battery condition prior to functional failure. Use Value: Provides user-facing feedback without MCU involvement - reduces BOM cost and firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6427EIUR+T | Identical SOT23-3 package and pinout; differs only in threshold pair (1.9V/2.6V vs. 2.0V/2.7V). | Suitable where tighter low-threshold margin is required before entering low-power mode. | Select MAX6427EIUR+T if system must sustain operation down to 1.9V; otherwise MAX6428EIUR+T provides wider hysteresis margin. |
| TLV7031DBVR | Single comparator with 1.8V reference; requires external resistors for threshold setting and pull-up for open-drain output. | Used where adjustable thresholds and flexible output polarity are needed, at cost of higher design overhead. | Choose TLV7031DBVR only when programmability justifies added components and layout area; MAX6428EIUR+T delivers plug-and-play accuracy. |
Compared with MAX6427EIUR+T, MAX6428EIUR+T offers higher hysteresis (0.7V vs. 0.7V nominal but tighter 2.0V/2.7V spacing), while TLV7031DBVR demands external biasing and lacks integrated timeout - making MAX6428EIUR+T optimal for fixed-threshold, zero-component, ultra-low-power designs.
Availability
MAX6428EIUR+T is available at Aetrix Electronics and suitable for portable medical devices, pagers, and MP3 players requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6428EIUR+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 emphasis on ultra-low-power, high-reliability solutions for portable and industrial systems.
The MAX6427–MAX6438 family was engineered specifically for battery-state awareness in space- and power-constrained devices, delivering factory-calibrated accuracy without external components across -40°C to +85°C.
FAQ
What is the exact low-battery threshold voltage for MAX6428EIUR+T?
The MAX6428EIUR+T has a factory-trimmed low-threshold voltage (VLTH) of 2.0V ±2.5%, meaning it asserts the LBO output when the BATT voltage falls below 1.95V minimum and 2.05V maximum across temperature and process variation. This value is laser-trimmed at wafer test and does not require calibration in circuit.
Does MAX6428EIUR+T require external resistors or capacitors?
No, MAX6428EIUR+T requires no external components. Its thresholds are factory-trimmed, its 140ms timeout is internally generated, and its push-pull LBO output drives directly into microcontroller inputs - making it a true "connect-and-go" battery monitor for SOT23-3 layouts.
Can MAX6428EIUR+T operate down to 1.0V battery voltage?
Yes, MAX6428EIUR+T guarantees valid LBO logic state (high or low) with BATT as low as 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic behavior during final battery discharge - critical for safe shutdown sequencing in medical and safety-critical devices.
What is the function of the LBO pin on MAX6428EIUR+T?
The LBO pin on MAX6428EIUR+T is an active-low push-pull output that sinks current when asserted (BATT < 2.0V) and sources current when deasserted (BATT > 2.7V post-140ms timeout). It interfaces directly with microcontroller NMI, reset, or GPIO pins without pull-up resistors or level-shifting.
How does MAX6428EIUR+T handle voltage transients during battery load switching?
MAX6428EIUR+T is immune to short battery voltage transients ≤10µs duration and ≤100mV amplitude, as verified in Typical Operating Characteristics (Figure 3). This prevents false low-battery assertions when motors, displays, or radios cause momentary dips - a key reliability feature for handheld and wearable electronics.
MAX6428EIUR+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:
- 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
MAX6428EIUR+T FAQ
1.How can I place an order for MAX6428EIUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6428EIUR+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 MAX6428EIUR+T reliable?
The price and inventory of MAX6428EIUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6428EIUR+T is usually 5 days.
3.What payment methods are accepted for MAX6428EIUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6428EIUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6428EIUR+T?
MAX6428EIUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6428EIUR+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 MAX6428EIUR+T?
For technical support, including MAX6428EIUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6428EIUR+T requirements.
6.How does Aetrix verify that MAX6428EIUR+T is sourced from the original manufacturer or authorized distributors?
All MAX6428EIUR+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 MAX6428EIUR+T meets industry standards.
7.What is the process for return or replacement of MAX6428EIUR+T?
All MAX6428EIUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6428EIUR+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 MAX6428EIUR+T part is unused and in its original packaging.
Return procedure for MAX6428EIUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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