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Analog Devices Inc./Maxim Integrated MAX6439UTEHRD3+
- Part No.:
- MAX6439UTEHRD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-6
- Datasheet:
-
MAX6439UTEHRD3+.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
MAX6439UTEHRD3+ from Maxim Integrated is an ultra-low-power single-output battery monitor with integrated microprocessor supervisor, designed for Li+ and multicell alkaline/NiMH/NiCd systems. It features factory-trimmed 3.00V VCC reset threshold, 150ms reset timeout, 2.925V/3.000V low-battery hysteresis thresholds (LTH/HTH), and consumes only 2.5µA typical supply current at 3.6V. It delivers active-low open-drain LBO and push-pull RESET outputs in a 6-pin SOT23 package for portable medical devices and MP3 players.
For engineers reviewing the MAX6439UTEHRD3+ datasheet, MAX6439UTEHRD3+ pinout, MAX6439UTEHRD3+ application, or MAX6439UTEHRD3+ equivalent, key selection factors include its dual-threshold battery monitoring with 150ms timeout stabilization, independent VCC supervision with manual reset capability, and compatibility with single-cell Li+ (2.9–3.0V range) and two-/three-cell alkaline power rails.
Technical Context
The MAX6439UTEHRD3+ integrates a 1.23V reference, dual comparators, timing circuitry, and logic to implement precise battery state detection with hysteresis. Its LBO output asserts when VBATT falls below 2.925V (LTH) and deasserts only after rising above 3.000V (HTH) for ≥150ms - eliminating chatter during voltage transients.
It provides independent µP supervision via a push-pull RESET output triggered by VCC falling below 2.925V (±75mV), with a fixed 150ms minimum timeout. The MR pin supports debounced manual reset with 1.5kΩ internal pullup and 150ms rising-edge debounce period.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBATT Monitoring | Single-level detection with 2.925V low-threshold (LTH) and 3.000V high-threshold (HTH); enables stable battery OK/low signaling with built-in hysteresis |
| VCC Supervision | Fixed 2.925V reset threshold (±75mV) with 150ms timeout; ensures reliable µP reset during brownout recovery |
| Supply Current | 2.5µA typical at 3.6V VBATT/3.3V VCC; supports multi-year operation in coin-cell–powered devices |
| Output Types | Open-drain LBO (VBATT monitoring) and push-pull RESET (VCC supervision); eliminates external pullups for RESET |
| Operating Temp | -40°C to +85°C; qualified for industrial and portable consumer environments without derating |
| Package | SOT23-6 (2.8 × 2.9 × 1.3 mm); compatible with standard pick-and-place and reflow processes |
Pinout & Package
SOT23-6 package: 2.8mm × 2.9mm × 1.3mm body, 0.95mm lead pitch, gull-wing leads, JEDEC MO-178 compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Battery voltage input and primary power source; monitors charge state and powers device when > VCC |
| 2 | MR | Active-low manual reset input with 1.5kΩ internal pullup to VCC; debounced for 150ms to suppress switch bounce |
| 3 | LBO | Open-drain low-battery output; asserted low when VBATT < 2.925V, deasserted after ≥150ms above 3.000V |
| 4 | RESET | Push-pull active-low reset output; asserts when VCC < 2.925V and holds for ≥150ms after VCC recovers |
| 5 | GND | Analog/digital ground reference; common return for VBATT, VCC, and all outputs |
| 6 | VCC | System supply voltage input and secondary power source; powers device when > VBATT and enables VCC supervision |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.925V/3.000V (LTH/HTH) for Li+ and alkaline/NiMH monitoring - eliminates external resistors and calibration |
| Immunity to voltage transients | Rejects ≤100µs VBATT dips below LTH - prevents false low-battery alerts during load switching |
| Manual reset with debounce | MR pin includes 1.5kΩ internal pullup and 150ms rising-edge debounce - enables robust push-button interface without RC network |
| No external components | Self-contained supervision: no capacitors, resistors, or diodes required for basic operation |
| Low quiescent current | 2.5µA typical ICC + IBATT - extends battery life in always-on portable systems |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Battery-powered glucose meter with LCD display and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Monitors single-cell Li+ voltage to trigger low-power mode at 2.925V and disable system at 3.000V hysteresis boundary; provides clean µP reset on VCC brownout. Use Value: Prevents data corruption during battery depletion and ensures deterministic shutdown before EEPROM write failure. |
Use Scenario: Flash-based audio player using 3.7V Li+ cell and DC/DC converter for 3.3V logic rail. IC Role / Device Role / Timing Role: Generates LBO signal at 2.925V to reduce DAC sampling rate and disable backlight; issues 150ms RESET pulse on VCC sag to prevent firmware lockup. Use Value: Extends playback time by 12% through adaptive power scaling and guarantees safe restart after power interruption. |
| Electronic Toys | Cell Phones |
Use Scenario: Voice-recording plush toy with motion-activated playback and rechargeable NiMH pack. IC Role / Device Role / Timing Role: Detects two-cell NiMH depletion (2.925V threshold) to mute audio and enter sleep; supervises 3.3V VCC rail for MCU reset integrity. Use Value: Eliminates unexpected resets during motor activation spikes and avoids "phantom power" drain in standby. |
Use Scenario: Feature phone with GSM modem, keypad, and monochrome display powered by single Li+ cell. IC Role / Device Role / Timing Role: Asserts LBO at 2.925V to dim display and throttle RF transmit power; provides push-pull RESET to guarantee baseband processor reboot on VCC dip. Use Value: Maintains call continuity during transient battery sag and prevents SIM card communication errors during brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring and µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6440UTEHRD3+ | Identical thresholds and timing, but open-drain RESET output instead of push-pull; requires external pullup resistor | Suitable where RESET must interface to higher-voltage logic (e.g., 5V I/O) or share bus with other open-drain signals | Select MAX6440UTEHRD3+ only if system-level RESET net requires wired-OR capability or level translation |
| TPS3808G125DBVR | Single VDD supervisor (no VBATT monitoring); 1.25V reset threshold; 200ms timeout; 1.6µA quiescent current | Applicable only for VCC-only supervision; lacks battery state awareness and dual-threshold hysteresis | Choose TPS3808G125DBVR only when battery monitoring is handled separately and ultra-low IQ (<2µA) is mandatory |
Compared with MAX6440UTEHRD3+, the MAX6439UTEHRD3+ saves one external component (pullup resistor) and simplifies RESET routing; versus TPS3808G125DBVR, it adds critical battery health visibility but consumes slightly more current - making it optimal for Li+-powered systems needing both functions in one die.
Availability
MAX6439UTEHRD3+ is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, electronic toys, and cell phones requiring stable component supply across extended production lifecycles.
Supply support for MAX6439UTEHRD3+ 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, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX6439–MAX6442 family targets battery-constrained systems needing simultaneous battery state awareness and µP supervision - delivering integrated hysteresis, manual reset, and ultra-low IQ in minimal footprint.
FAQ
What is the exact low-battery threshold behavior of the MAX6439UTEHRD3+?
The MAX6439UTEHRD3+ asserts its LBO output when VBATT drops below 2.925V (LTH) and holds it asserted until VBATT rises above 3.000V (HTH) for a minimum of 150ms. This hysteresis prevents chattering during voltage fluctuations near the trip point, and the timeout ensures system stability before resuming full operation. The thresholds are factory-trimmed and guaranteed over -40°C to +85°C.
Does the MAX6439UTEHRD3+ require external components for basic operation?
No, the MAX6439UTEHRD3+ operates autonomously with no external components required. Its factory-trimmed thresholds, internal 1.5kΩ MR pullup, and push-pull RESET eliminate need for resistors, capacitors, or diodes. Only decoupling capacitors (recommended 0.1µF near VCC/GND) are advised for noise immunity - not functional prerequisites.
How does the manual reset (MR) function interact with the VCC reset in the MAX6439UTEHRD3+?
In the MAX6439UTEHRD3+, pulling MR low generates a one-shot RESET pulse lasting 150ms, independent of VCC level - even if VCC remains above 2.925V. This allows controlled system reset during normal operation. If VCC simultaneously sags below threshold, the internal timer restarts. MR includes 150ms rising-edge debounce to reject switch bounce, ensuring only valid button presses trigger reset.
What is the supply current specification for the MAX6439UTEHRD3+ under typical conditions?
The MAX6439UTEHRD3+ draws 2.5µA typical total supply current (ICC + IBATT) at TA = +25°C with VBATT = 3.6V and VCC = 3.3V, no load. This value increases to ≤7µA maximum across -40°C to +85°C. The ultra-low IQ enables multi-year battery life in always-on applications such as medical sensors and remote controls.
Can the MAX6439UTEHRD3+ monitor batteries other than single-cell Li+?
Yes, the MAX6439UTEHRD3+ is specified for single-cell Li+ (2.9–3.0V range) and also supports two- or three-cell alkaline/NiMH/NiCd systems. Its 1.2V to 5.5V VBATT operating range and factory-trimmed thresholds accommodate nominal 3.0V alkaline stacks and 2.4V NiMH packs. Hysteresis and transient immunity ensure reliable operation despite load-induced voltage droop.
MAX6439UTEHRD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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-6
MAX6439UTEHRD3+ FAQ
1.How can I place an order for MAX6439UTEHRD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6439UTEHRD3+ 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 MAX6439UTEHRD3+ reliable?
The price and inventory of MAX6439UTEHRD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6439UTEHRD3+ is usually 5 days.
3.What payment methods are accepted for MAX6439UTEHRD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6439UTEHRD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6439UTEHRD3+?
MAX6439UTEHRD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6439UTEHRD3+ 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 MAX6439UTEHRD3+?
For technical support, including MAX6439UTEHRD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6439UTEHRD3+ requirements.
6.How does Aetrix verify that MAX6439UTEHRD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6439UTEHRD3+ 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 MAX6439UTEHRD3+ meets industry standards.
7.What is the process for return or replacement of MAX6439UTEHRD3+?
All MAX6439UTEHRD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6439UTEHRD3+, 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 MAX6439UTEHRD3+ part is unused and in its original packaging.
Return procedure for MAX6439UTEHRD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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