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Analog Devices Inc./Maxim Integrated MAX6439UTEHRD3+T
- Part No.:
- MAX6439UTEHRD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-6
- Datasheet:
-
MAX6439UTEHRD3+T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6439UTEHRD3+T from Maxim Integrated is a single-output, ultra-low-power battery monitor with integrated microprocessor supervisor. It features factory-trimmed 2.925V/3.000V hysteresis thresholds (LTH/HTH), 150ms LBO timeout, 2.5µA typical supply current at 3.6V, and push-pull RESET output. It monitors single-cell Li+ or multicell alkaline/NiMH batteries in portable medical devices and MP3 players.
For engineers reviewing the MAX6439UTEHRD3+T datasheet, MAX6439UTEHRD3+T pinout, MAX6439UTEHRD3+T application, or MAX6439UTEHRD3+T equivalent, key selection criteria include its dual-threshold hysteresis behavior, VCC reset threshold of 2.925V (±75mV), 150ms reset timeout, SOT23-6 package compatibility, and manual reset support via MR pin.
Technical Context
The MAX6439UTEHRD3+T integrates a 1.23V reference, two comparators, timing circuitry, and logic to deliver precise battery state detection. Its dual-threshold architecture (LTH = 2.925V, HTH = 3.000V) provides 75mV hysteresis, eliminating output chatter during voltage transients near threshold.
It operates independently on VBATT or VCC (1.2V–5.5V), with power sourced from the higher of the two rails. The push-pull RESET output asserts low when VCC falls below 2.925V and remains low for ≥150ms after VCC exceeds the threshold, ensuring stable microprocessor initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBATT Thresholds | LTH = 2.925V, HTH = 3.000V - factory-trimmed hysteresis pair for reliable low-battery detection without external components |
| VCC Reset Threshold | 2.925V ±75mV - fixed threshold enabling robust µP reset at defined supply voltage collapse point |
| Supply Current | 2.5µA typ at 3.6V - enables multi-year operation in coin-cell–powered systems |
| LBO Timeout Period | 150ms min - ensures stable battery voltage before deasserting low-battery signal |
| RESET Output Type | Push-pull - eliminates need for external pull-up resistor; drives high to 0.8×VCC when deasserted |
| Operating Temp Range | −40°C to +85°C - supports industrial and consumer portable equipment deployment |
| Package | SOT23-6 - 2.9mm × 1.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm lead pitch, lead-free +T variant compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBATT | Battery voltage input & primary power rail | Monitors battery health and powers device if VBATT > VCC; accepts 1.2V–5.5V |
| 2 - MR | Manual reset input (active-low) | Internal 1.5kΩ pullup to VCC; debounced 150ms rising-edge rejection prevents switch bounce false triggers |
| 3 - LBO | Low-battery output (active-low, open-drain) | Asserts when VBATT < 2.925V; deasserts only after VBATT > 3.000V for ≥150ms |
| 4 - RESET | Microprocessor reset output (active-low, push-pull) | Asserts when VCC < 2.925V; holds low ≥150ms post-threshold recovery; no external pull-up needed |
| 5 - GND | Analog/digital ground reference | Common return path for VBATT, VCC, and all internal circuitry; must be low-impedance |
| 6 - VCC | System supply voltage input & reset monitor rail | Supplies device if VCC > VBATT; monitored for µP reset; range: 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed dual thresholds | 2.925V/3.000V hysteresis eliminates need for external resistors or calibration in Li+/alkaline systems |
| Immunity to short VBATT transients | Withstands ≤100µs transients up to 75mV overdrive - prevents false LBO assertion during load switching |
| Integrated manual reset | MR pin with internal 1.5kΩ pullup and 150ms debounce enables push-button reset without external RC network |
| Ultra-low quiescent current | 2.5µA typical at 3.6V extends battery life in always-on monitoring applications |
| No external components required | Self-contained supervision: reference, comparators, timing, logic, and output drivers integrated in one die |
Applications
| Portable Medical Devices | MP3 Players |
|---|---|
Use Scenario: Continuous glucose monitor powered by single Li+ cell with real-time battery state reporting. IC Role / Device Role / Timing Role: MAX6439UTEHRD3+T detects battery depletion at 2.925V and signals MCU to initiate low-power mode or alert user before shutdown. Use Value: Prevents unexpected power loss during critical measurement cycles using hysteresis-stabilized LBO assertion/deassertion. |
Use Scenario: Flash-based audio player with dynamic power management based on remaining battery capacity. IC Role / Device Role / Timing Role: MAX6439UTEHRD3+T's push-pull RESET ensures clean µP restart after brownout, while LBO triggers display dimming and codec clock scaling. Use Value: Enables deterministic low-power transitions without external supervision circuitry or firmware polling overhead. |
| Electronic Toys | PDAs |
Use Scenario: Voice-recording toy using alkaline AA cells where audible low-battery warning must precede functional disable. IC Role / Device Role / Timing Role: MAX6439UTEHRD3+T asserts LBO at 2.925V to trigger voice prompt; deasserts only after 3.000V sustained for 150ms to avoid chatter. Use Value: Eliminates false warnings during motor startup surges, improving perceived reliability and user experience. |
Use Scenario: Handheld PDA with Li+ battery and embedded ARM processor requiring guaranteed reset integrity during voltage sag. IC Role / Device Role / Timing Role: MAX6439UTEHRD3+T monitors VCC and delivers glitch-free, push-pull RESET pulse with 150ms timeout to prevent partial memory writes. Use Value: Guarantees safe µP state recovery without external reset IC or capacitor-based timing networks. |
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 |
|---|---|---|---|
| MAX6440UTEHRD3+T | Same thresholds (2.925V/3.000V), same SOT23-6 package, but open-drain RESET output instead of push-pull | Requires external pull-up resistor on RESET; suitable where level-shifting or wired-OR reset bus is needed | Select MAX6440UTEHRD3+T only if system design mandates open-drain reset signaling or shares RESET line with other devices |
| TPS3808G125DBVR | Single-threshold supervisor (1.25V reset), no battery monitoring; 1.6µA IQ, 200ms timeout, SOT23-6 | Only supervises VCC - lacks VBATT monitoring, LBO output, and hysteresis; not a functional substitute for battery state awareness | Choose TPS3808G125DBVR only for basic VCC-only reset needs where battery voltage tracking is handled elsewhere |
Compared with MAX6440UTEHRD3+T and TPS3808G125DBVR, the MAX6439UTEHRD3+T uniquely combines dual-threshold battery monitoring with push-pull RESET in a single SOT23-6 IC - eliminating both external components and design compromises required by alternatives.
Availability
MAX6439UTEHRD3+T is available at Aetrix Electronics and suitable for portable medical devices, MP3 players, electronic toys, and PDAs requiring stable component supply across extended production lifecycles.
Supply support for MAX6439UTEHRD3+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, mixed-signal, and power management ICs for demanding industrial, medical, and consumer applications.
The MAX6439–MAX6442 family targets ultra-low-power battery-operated systems needing accurate, hysteresis-enabled battery state awareness and reliable µP reset - with no external components required.
FAQ
What is the exact LTH and HTH voltage threshold pair for MAX6439UTEHRD3+T?
The MAX6439UTEHRD3+T has factory-trimmed lower and upper battery thresholds of LTH = 2.925V and HTH = 3.000V, providing 75mV hysteresis. These values are specified in the Electrical Characteristics table under "MAX6439UTE" row for LTH and HTH columns, with typical tolerance ±75mV across −40°C to +85°C.
Does MAX6439UTEHRD3+T require external components for basic operation?
No, the MAX6439UTEHRD3+T requires zero external components for full functionality. Its factory-trimmed thresholds, integrated 1.23V reference, comparator circuitry, timing blocks, and push-pull RESET output eliminate the need for resistors, capacitors, or external references - enabling direct drop-in use in space-constrained designs.
What is the function of the MR pin on MAX6439UTEHRD3+T?
The MR pin on MAX6439UTEHRD3+T is an active-low manual reset input with internal 1.5kΩ pullup to VCC. When pulled low, it triggers a one-shot RESET pulse with 150ms timeout. It includes 150ms rising-edge debounce to suppress switch bounce, and supports CMOS-level or push-button drive without external circuitry.
How does the push-pull RESET output of MAX6439UTEHRD3+T differ from open-drain alternatives?
The push-pull RESET output of MAX6439UTEHRD3+T actively drives high (to 0.8×VCC) and low (≤0.3V), eliminating the need for an external pull-up resistor. This reduces BOM count, improves noise immunity on the reset line, and ensures faster rise times compared to open-drain variants like MAX6440UTEHRD3+T, which require external pull-up for high-state assertion.
What is the supply current consumption of MAX6439UTEHRD3+T at 3.6V?
The MAX6439UTEHRD3+T draws 2.5µA typical total supply current (ICC + IBATT) at VBATT = 3.6V and VCC = 3.3V, with no load. This ultra-low quiescent current enables multi-year battery life in always-on monitoring applications such as portable medical sensors and low-duty-cycle consumer electronics.
MAX6439UTEHRD3+T 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+T FAQ
1.How can I place an order for MAX6439UTEHRD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6439UTEHRD3+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 MAX6439UTEHRD3+T reliable?
The price and inventory of MAX6439UTEHRD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6439UTEHRD3+T is usually 5 days.
3.What payment methods are accepted for MAX6439UTEHRD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6439UTEHRD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6439UTEHRD3+T?
MAX6439UTEHRD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6439UTEHRD3+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 MAX6439UTEHRD3+T?
For technical support, including MAX6439UTEHRD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6439UTEHRD3+T requirements.
6.How does Aetrix verify that MAX6439UTEHRD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6439UTEHRD3+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 MAX6439UTEHRD3+T meets industry standards.
7.What is the process for return or replacement of MAX6439UTEHRD3+T?
All MAX6439UTEHRD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6439UTEHRD3+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 MAX6439UTEHRD3+T part is unused and in its original packaging.
Return procedure for MAX6439UTEHRD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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