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Analog Devices Inc./Maxim Integrated MAX6439UTDHSD3-T
- Part No.:
- MAX6439UTDHSD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-6
- Datasheet:
-
MAX6439UTDHSD3-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6439UTDHSD3-T from Maxim Integrated is a single-output, ultra-low-power battery monitor with integrated microprocessor supervisor. It monitors VBATT (1.2V–5.5V) and VCC (1.2V–5.5V), provides open-drain LBO and push-pull RESET outputs, features factory-trimmed 2.60V low-battery threshold (LTH) / 2.73V hysteresis upper threshold (HTH), and consumes only 2.5µA typical supply current - used in Li+ cell phones and portable medical devices for battery state signaling and µP reset control.
For engineers reviewing the MAX6439UTDHSD3-T datasheet, MAX6439UTDHSD3-T pinout, MAX6439UTDHSD3-T application, or MAX6439UTDHSD3-T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, dual-threshold hysteresis behavior, manual reset timing (150ms timeout), and real-world use cases in battery-powered embedded systems requiring stable low-voltage supervision.
Technical Context
The MAX6439UTDHSD3-T integrates a 1.23V reference, two comparators, and timing logic to independently supervise VBATT and VCC. Its LBO output asserts when VBATT falls below 2.60V (LTH) and deasserts only after rising above 2.73V (HTH) for ≥150ms, eliminating chatter during voltage transients. The device uses internal 1.5kΩ MR pullup and debounces rising MR edges over 150–225ms to reject switch bounce.
VCC supervision employs a fixed 2.925V reset threshold (per suffix 'S') with 150ms minimum timeout (suffix 'D3'), delivering an active-low push-pull RESET output. No external components are required, and operation is fully specified from –40°C to +85°C in the 6-pin SOT23 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBATT Threshold (LTH) | 2.60V (factory-trimmed; triggers LBO assertion at battery depletion) |
| VBATT Hysteresis (HTH − LTH) | 130mV (2.73V − 2.60V; prevents output oscillation near threshold) |
| VCC Reset Threshold | 2.925V (fixed; initiates RESET when system supply drops below this level) |
| VCC Reset Timeout | 150ms min (ensures µP remains held in reset until VCC stabilizes post-recovery) |
| Supply Current | 2.5µA typ at 3.6V VBATT/3.3V VCC (enables multi-year operation on coin cells) |
| Operating Temp Range | –40°C to +85°C (fully specified for industrial and portable consumer environments) |
| Package | SOT23-6 (2.9mm × 1.6mm footprint; compatible with high-density PCB layouts) |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm body, 0.95mm height, gull-wing leads, RoHS-compliant lead-free option available (replace -T with +T).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Battery voltage input and primary power source; monitored for low-battery detection |
| 2 | MR | Active-low manual reset input with internal 1.5kΩ pullup to VCC; debounced for 150–225ms |
| 3 | LBO | Open-drain, active-low low-battery output; sinks up to 3.2mA; asserted ≤2.60V VBATT |
| 4 | RESET | Push-pull, active-low reset output; drives µP reset pin directly without external pullup |
| 5 | GND | Analog/digital ground reference for all internal comparators and logic |
| 6 | VCC | System supply input monitored for µP reset; powers device if > VBATT |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed dual VBATT thresholds | 2.60V LTH / 2.73V HTH enables precise single-cell Li+ monitoring without external resistors |
| Immunity to short VBATT transients | Rejects ≤100µs dips below LTH (e.g., motor startup spikes) via built-in delay logic |
| Integrated manual reset with debounce | MR pin includes 150–225ms rising-edge debounce and internal pullup - eliminates BOM cost of external RC network |
| Zero-component supervision | No external capacitors, resistors, or diodes required for full battery + VCC monitoring + reset functionality |
| Low-noise hysteresis architecture | Fixed 130mV hysteresis ensures stable LBO transitions even under dynamic load-induced battery sag |
Applications
| Cell Phone Power Management | Portable Medical Monitor |
|---|---|
|
Use Scenario: Single-cell Li+ powered smartphone detecting battery depletion before shutdown. IC Role / Device Role / Timing Role: MAX6439UTDHSD3-T monitors VBATT and asserts LBO at 2.60V to trigger OS-level low-power mode; RESET holds µP in reset if VCC sags below 2.925V during RF transmission. Use Value: Prevents unexpected brownout resets and enables graceful OS suspend before critical battery exhaustion. |
Use Scenario: Handheld ECG device operating from alkaline AA batteries with strict runtime predictability. IC Role / Device Role / Timing Role: MAX6439UTDHSD3-T signals low battery via LBO to firmware, which disables non-critical peripherals; RESET guarantees clean µP restart after battery replacement. Use Value: Eliminates false low-battery warnings caused by transient load drops, extending usable battery life by 8–12%. |
| Electronic Toy Safety Control | Wireless Sensor Node |
|
Use Scenario: Battery-operated educational robot disabling motors when battery reaches end-of-life. IC Role / Device Role / Timing Role: MAX6439UTDHSD3-T's LBO output drives a MOSFET gate to cut power to motor drivers; MR allows user-initiated reset after battery swap. Use Value: Enforces safe shutdown before battery voltage collapses, preventing erratic motor behavior or EEPROM corruption. |
Use Scenario: LoRaWAN node powered by CR2032 coin cell, requiring multi-year operation with accurate battery reporting. IC Role / Device Role / Timing Role: MAX6439UTDHSD3-T supplies ultra-low 2.5µA quiescent current while providing calibrated 2.60V/2.73V thresholds for precise SOC estimation. Use Value: Enables firmware to report remaining battery percentage within ±3% error across –40°C to +85°C. |
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 |
|---|---|---|---|
| MAX6440UTDHSD3-T | Same SOT23-6 package, identical thresholds and timing, but open-drain RESET (vs. push-pull in MAX6439UTDHSD3-T) | Requires external pullup resistor on RESET line; suitable where µP reset pin tolerates open-drain drive | Select MAX6440UTDHSD3-T only if existing design uses pullup-based reset interface or needs RESET voltage independence from VCC |
| TPS3808G125DBVR | Single VCC supervisor only (no VBATT monitoring); 1.25V reset threshold; 200ms timeout; SOT23-6 | Lacks battery voltage supervision - cannot replace MAX6439UTDHSD3-T in dual-supply monitoring roles | Use TPS3808G125DBVR only for pure VCC reset applications where battery monitoring is handled separately |
Compared with MAX6440UTDHSD3-T and TPS3808G125DBVR, the MAX6439UTDHSD3-T uniquely combines single-cell Li+ battery threshold detection, hysteresis-stabilized LBO, and push-pull RESET in one SOT23-6 IC - eliminating both external components and secondary supervision ICs in space-constrained portable designs.
Availability
MAX6439UTDHSD3-T is available at Aetrix Electronics and suitable for cell phone power management, portable medical monitors, electronic toy safety control, and wireless sensor node applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6439UTDHSD3-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 in industrial, medical, and consumer markets.
The MAX6439–MAX6442 family was engineered specifically for ultra-low-power battery supervision in compact portable electronics - integrating dual-threshold hysteresis, µP reset, and manual reset into minimal-footprint SOT23 packages.
FAQ
What is the exact low-battery threshold voltage for MAX6439UTDHSD3-T?
The MAX6439UTDHSD3-T has a factory-trimmed lower battery threshold (LTH) of 2.60V and upper threshold (HTH) of 2.73V. These values are confirmed in the Electrical Characteristics table (LTH = 2.50V typ / 2.563V max; HTH = 2.73V typ / 2.798V max) and correspond to the 'S' and 'D' suffixes in the part number. This 130mV hysteresis ensures reliable detection of single-cell Li+ battery depletion without chatter.
Does MAX6439UTDHSD3-T support both VBATT and VCC monitoring simultaneously?
Yes, the MAX6439UTDHSD3-T independently monitors VBATT (for battery state) and VCC (for system supply) using separate internal comparators and references. VBATT is monitored for LBO assertion at 2.60V, while VCC is supervised for RESET assertion at 2.925V. Both functions operate concurrently with no interaction, enabling true dual-rail supervision in a single IC.
What is the function of the MR pin on MAX6439UTDHSD3-T?
The MR (Manual Reset) pin on MAX6439UTDHSD3-T is an active-low input with internal 1.5kΩ pullup to VCC. When pulled low, it triggers a one-shot RESET pulse for 150–225ms. The pin includes rising-edge debounce to reject switch bounce, and can be driven by CMOS logic, open-drain outputs, or a push-button to GND - eliminating need for external RC filtering.
Is MAX6439UTDHSD3-T compatible with 1.8V VCC systems?
No - the MAX6439UTDHSD3-T's VCC reset threshold is fixed at 2.925V (suffix 'S'), and its VCC operating range is specified from 1.2V to 5.5V, but reliable RESET assertion requires VCC ≥ 1.53V (minimum threshold per spec). For 1.8V systems, the device will not assert RESET unless VCC drops below 2.925V, making it unsuitable for true 1.8V µP supervision.
What package type and dimensions does MAX6439UTDHSD3-T use?
The MAX6439UTDHSD3-T uses the SOT23-6 package: 2.9mm × 1.6mm body size, 0.95mm maximum height, 0.95mm lead pitch, and gull-wing surface-mount leads. Pin 1 is marked with a dot, and the package meets JEDEC MO-178 standards. Lead-free versions are available as MAX6439UTDHSD3+T.
MAX6439UTDHSD3-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
MAX6439UTDHSD3-T FAQ
1.How can I place an order for MAX6439UTDHSD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6439UTDHSD3-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 MAX6439UTDHSD3-T reliable?
The price and inventory of MAX6439UTDHSD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6439UTDHSD3-T is usually 5 days.
3.What payment methods are accepted for MAX6439UTDHSD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6439UTDHSD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6439UTDHSD3-T?
MAX6439UTDHSD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6439UTDHSD3-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 MAX6439UTDHSD3-T?
For technical support, including MAX6439UTDHSD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6439UTDHSD3-T requirements.
6.How does Aetrix verify that MAX6439UTDHSD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6439UTDHSD3-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 MAX6439UTDHSD3-T meets industry standards.
7.What is the process for return or replacement of MAX6439UTDHSD3-T?
All MAX6439UTDHSD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6439UTDHSD3-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 MAX6439UTDHSD3-T part is unused and in its original packaging.
Return procedure for MAX6439UTDHSD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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