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Analog Devices Inc./Maxim Integrated MAX6440UTEHRD3-T
- Part No.:
- MAX6440UTEHRD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-6
- Datasheet:
-
MAX6440UTEHRD3-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
The MAX6440UTEHRD3-T from Maxim Integrated is a single-output, ultra-low-power battery monitor with integrated microprocessor supervisor and push-pull active-low RESET output. It monitors VBATT (1.2V–5.5V) and VCC (1.2V–5.5V), provides factory-trimmed 2.925V/3.000V low-battery thresholds with 150ms timeout hysteresis, draws only 2.5µA typical supply current at 3.6V, and operates across –40°C to +85°C - enabling reliable power management in compact Li+ or alkaline/NiMH portable systems.
For engineers reviewing the MAX6440UTEHRD3-T datasheet, MAX6440UTEHRD3-T pinout, MAX6440UTEHRD3-T application, or MAX6440UTEHRD3-T equivalent, this device delivers verified dual-threshold battery state signaling, independent VCC reset supervision with 150ms timeout, manual reset capability, and SOT23-6 compatibility for space-constrained embedded designs requiring stable low-voltage monitoring and deterministic system reset behavior.
Technical Context
The MAX6440UTEHRD3-T integrates a precision 1.23V reference, dual comparators, timing logic, and push-pull RESET driver to deliver coordinated battery health assessment and µP supervision. Its LBO output asserts when VBATT falls below the factory-set LTH (2.925V) and deasserts only after VBATT rises above HTH (3.000V) for ≥150ms, eliminating chatter during voltage transients.
VCC supervision uses a separate comparator with fixed 2.925V reset threshold (±75mV tolerance) and 150ms minimum timeout (D3 suffix). The MR input features internal 1.5kΩ pullup, 150ms rising-edge debounce, and 1µs minimum pulse width support - enabling robust push-button reset without external RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBATT Threshold (LTH) | 2.925V (factory-trimmed lower trip point for single-cell Li+ or multi-cell alkaline/NiMH) |
| VBATT Threshold (HTH) | 3.000V (factory-trimmed upper trip point; provides 75mV hysteresis to prevent output oscillation) |
| VCC Reset Threshold | 2.925V ±75mV (ensures deterministic µP reset initiation at defined supply rail collapse point) |
| Supply Current | 2.5µA typical at 3.6V VBATT/3.3V VCC (enables >1-year battery life in always-on monitoring) |
| LBO Timeout Period | 150ms minimum (guarantees stable voltage recovery before deassertion; prevents premature system wake-up) |
| RESET Output Type | Push-pull active-low (drives high to 0.8×VCC when deasserted; eliminates need for external pullup) |
| Operating Temperature | –40°C to +85°C (fully specified for industrial-grade portable equipment deployment) |
Pinout & Package
SOT23-6 package (6-pin, 2.8mm × 2.9mm × 1.3mm body, lead pitch 0.95mm), JEDEC MO-178 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBATT | Battery voltage input and primary power source | Monitors battery health directly; powers device if VBATT > VCC; supports 1.2V–5.5V range |
| 2 - MR | Active-low manual reset input | Internal 1.5kΩ pullup to VCC; debounced rising edge; triggers one-shot RESET pulse for 150ms |
| 3 - LBO | Active-low open-drain low-battery output | Asserts when VBATT < 2.925V; deasserts after VBATT > 3.000V for ≥150ms; compatible with 5.5V logic |
| 4 - RESET | Active-low push-pull reset output | Asserts when VCC < 2.925V; remains low for 150ms after VCC recovery; no external pullup required |
| 5 - GND | Analog/digital ground reference | Common return path for VBATT, VCC, LBO, RESET, and MR; requires low-impedance PCB connection |
| 6 - VCC | System supply voltage input and reset monitor source | Supplies device if VCC > VBATT; monitored for µP reset; supports 1.2V–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed dual VBATT thresholds | 2.925V/3.000V pair enables precise battery state discrimination without external resistors or calibration |
| 150ms LBO hysteresis timeout | Prevents false low-battery alerts during transient load drops or brief voltage sags in real-world battery discharge |
| Push-pull RESET output | Eliminates external pullup resistor, reduces BOM count, and ensures fast, rail-to-rail logic transitions |
| 2.5µA typical supply current | Extends battery runtime in always-on monitoring applications such as medical wearables and remote sensors |
| MR input with 150ms debounce | Rejects mechanical switch bounce and EMI-induced glitches without external RC filtering components |
Applications
| Portable Medical Sensors | Li+-Powered Handheld Instruments |
|---|---|
Use Scenario: Continuous glucose monitor operating from a single 3.6V Li+ cell with sleep/wake cycles. IC Role / Device Role / Timing Role: Monitors battery voltage decay to trigger low-power mode at 2.925V and disable operation at 3.000V recovery threshold; provides synchronized µP reset on VCC brownout. Use Value: Prevents data corruption during undervoltage conditions and extends usable battery life by 12% via accurate state-based power scaling. |
Use Scenario: Portable oscilloscope powered by integrated Li+ pack with USB charging and display backlight control. IC Role / Device Role / Timing Role: Generates LBO signal to dim backlight and throttle CPU before critical shutdown; asserts RESET on VCC sag during hot-plug events. Use Value: Enables graceful system state preservation and eliminates unexpected reboots during transient supply disturbances. |
| Wireless Remote Controls | Industrial Data Loggers |
Use Scenario: Two-cell alkaline remote with RF transmission, button interface, and LED feedback. IC Role / Device Role / Timing Role: Detects battery depletion at 2.925V to disable RF transmission and reduce polling frequency; resets µP on VCC dropout during cold start. Use Value: Avoids failed command transmissions and ensures consistent button response across full battery discharge curve. |
Use Scenario: Ruggedized environmental logger using three-cell NiMH batteries in field-deployed enclosures. IC Role / Device Role / Timing Role: Triggers storage flush and safe shutdown when VBATT crosses 2.925V; maintains µP reset integrity during temperature-induced VCC fluctuations. Use Value: Guarantees data integrity during battery replacement and prevents filesystem corruption in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor and µP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6439UTEHRD3-T | Open-drain RESET output instead of push-pull; identical VBATT/VCC thresholds and timing | Requires external pullup resistor on RESET line; suitable where board layout allows added component | Select when legacy design uses open-drain reset signaling or level-shifting is needed |
| TPS3808G12DBVR | Single VDD supervisor only (no VBATT monitoring); 1.2V reset threshold; 200ms timeout; 1.6µA quiescent current | No battery state awareness; only monitors system rail; lacks LBO functionality entirely | Select when only VCC supervision is required and battery monitoring is handled elsewhere |
Compared with MAX6440UTEHRD3-T, MAX6439UTEHRD3-T adds external pullup overhead but retains identical battery monitoring accuracy, while TPS3808G12DBVR reduces current draw by 0.9µA but removes all battery-level intelligence - making MAX6440UTEHRD3-T uniquely suited for dual-rail autonomous power management.
Availability
MAX6440UTEHRD3-T is available at Aetrix Electronics and suitable for portable medical devices, Li+-powered handheld instruments, wireless remote controls, and industrial data loggers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6440UTEHRD3-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 connectivity applications, with deep expertise in ultra-low-power supervisory circuits.
The MAX6439–MAX6442 family was engineered specifically for battery-operated systems needing simultaneous battery health assessment and µP reset supervision - delivering factory-trimmed accuracy, minimal external components, and industrial temperature reliability.
FAQ
What is the exact low-battery threshold configuration of the MAX6440UTEHRD3-T?
The MAX6440UTEHRD3-T has factory-trimmed VBATT thresholds of 2.925V (LTH) and 3.000V (HTH), with 75mV hysteresis. These values are encoded in the "UTE" (2.925V VCC reset) and "HR" (2.925V/3.000V battery thresholds) suffixes per Maxim's ordering guide. The D3 suffix confirms 150ms timeout for both LBO and RESET assertion/deassertion.
Does the MAX6440UTEHRD3-T require external components for basic operation?
No - the MAX6440UTEHRD3-T requires zero external components for core functionality. Its factory-trimmed thresholds, integrated 1.23V reference, push-pull RESET driver, and internal MR pullup eliminate the need for resistors, capacitors, or diodes in standard implementations, reducing BOM cost and PCB area.
How does the MR input behave during switch bounce on the MAX6440UTEHRD3-T?
The MAX6440UTEHRD3-T implements 150ms rising-edge debounce on the MR pin (tDEB), ignoring subsequent low pulses within that window after initial assertion. This prevents multiple RESET pulses from mechanical switch bounce, ensuring a single, clean one-shot reset event regardless of contact chatter duration.
Can the MAX6440UTEHRD3-T monitor batteries while powering from a different supply rail?
Yes - the MAX6440UTEHRD3-T autonomously selects its power source: it operates from whichever voltage is higher between VBATT and VCC. This allows direct battery voltage monitoring (e.g., 3.6V Li+) while interfacing with a lower 3.3V system rail, with LBO output compatible up to 5.5V logic levels.
What is the maximum allowable transient duration the MAX6440UTEHRD3-T tolerates on VBATT without false LBO assertion?
At 75mV overdrive (i.e., VBATT = LTH + 75mV = 3.000V), the MAX6440UTEHRD3-T tolerates transients up to ~120µs before asserting LBO, as confirmed by Figure TOC04 in the datasheet. This immunity ensures robust operation during brief load-switching spikes or charger-insertion surges.
MAX6440UTEHRD3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- 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-23-6
MAX6440UTEHRD3-T FAQ
1.How can I place an order for MAX6440UTEHRD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6440UTEHRD3-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 MAX6440UTEHRD3-T reliable?
The price and inventory of MAX6440UTEHRD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6440UTEHRD3-T is usually 5 days.
3.What payment methods are accepted for MAX6440UTEHRD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6440UTEHRD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6440UTEHRD3-T?
MAX6440UTEHRD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6440UTEHRD3-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 MAX6440UTEHRD3-T?
For technical support, including MAX6440UTEHRD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6440UTEHRD3-T requirements.
6.How does Aetrix verify that MAX6440UTEHRD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6440UTEHRD3-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 MAX6440UTEHRD3-T meets industry standards.
7.What is the process for return or replacement of MAX6440UTEHRD3-T?
All MAX6440UTEHRD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6440UTEHRD3-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 MAX6440UTEHRD3-T part is unused and in its original packaging.
Return procedure for MAX6440UTEHRD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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