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Analog Devices Inc./Maxim Integrated MAX6440UTKQSD3-T
- Part No.:
- MAX6440UTKQSD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-6
- Datasheet:
-
MAX6440UTKQSD3-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6440UTKQSD3-T from Maxim Integrated is a single-output, ultra-low-power battery monitor with integrated microprocessor supervisor. It provides factory-trimmed 1.60V low-battery threshold (LTH), 1.68V high-threshold (HTH), 2.625V VCC reset threshold, and push-pull active-low RESET output - all in a 6-pin SOT23 package. Designed for single-cell Li+ or two-/three-cell alkaline/NiMH systems, it enables battery-aware power management in portable medical devices and cordless phones.
For engineers reviewing the MAX6440UTKQSD3-T datasheet, MAX6440UTKQSD3-T pinout, MAX6440UTKQSD3-T application, or MAX6440UTKQSD3-T equivalent, key selection criteria include its 2.5µA typical supply current, 150ms LBO timeout, push-pull RESET drive capability, and factory-set dual-threshold hysteresis optimized for stable low-battery signaling without external components.
Technical Context
The MAX6440UTKQSD3-T integrates a precision 1.23V bandgap reference, dual comparators for VBATT monitoring, and independent VCC supervision circuitry. Its LBO assertion logic responds to VBATT falling below 1.60V (LTH) and deasserts only after VBATT rises above 1.68V (HTH) for ≥150ms, ensuring stable state transitions amid load-induced voltage transients.
VCC supervision uses a fixed 2.625V reset threshold with 150ms timeout (D3 suffix), delivering a push-pull RESET output capable of sourcing 100µA at 0.8×VCC and sinking 1.2mA at ≤0.3V. The MR pin features internal 1.5kΩ pullup and 150ms rising-edge debounce to reject switch bounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBATT Threshold (LTH) | 1.60V (typ), defines battery-low condition for system suspend; hysteresis prevents chatter near threshold |
| VBATT Threshold (HTH) | 1.68V (typ), defines battery-recovered condition; ensures stable re-enable after voltage stabilization |
| VCC Reset Threshold | 2.625V (typ), triggers µP reset when main supply drops below safe operating level |
| Supply Current | 2.5µA (typ at 3.6V), enables multi-year operation on coin-cell or small Li+ batteries |
| LBO Timeout Period | 150ms (min), guarantees minimum hold time before deassertion to prevent premature wake-up |
| RESET Output Type | Push-pull (not open-drain), eliminates need for external pullup and supports direct µP RESET pin drive |
| Operating Temp Range | –40°C to +85°C, qualified for industrial and portable consumer environments |
Pinout & Package
Package: 6-pin SOT23 (JEDEC MO-178 compliant), 2.80mm × 2.90mm footprint, 1.45mm height, lead-free (RoHS-compliant) option available as MAX6440UTKQSD3+T.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Battery voltage input and primary power source; monitors charge state and powers device if > VCC |
| 2 | MR | Active-low manual reset input with internal 1.5kΩ pullup; debounced for 150ms to suppress switch bounce |
| 3 | LBO | Open-drain, active-low low-battery output; asserts when VBATT < 1.60V, deasserts after VBATT > 1.68V for ≥150ms |
| 4 | RESET | Push-pull, active-low reset output; asserts when VCC < 2.625V and remains low for 150ms after VCC recovery |
| 5 | GND | Analog/digital ground reference; must be low-impedance connection to system common |
| 6 | VCC | Main supply input for µP supervisor; powers device if > VBATT; monitored for reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed dual VBATT thresholds | 1.60V LTH / 1.68V HTH (±40mV max deviation) - eliminates external resistor dividers and calibration effort |
| Immunity to short VBATT transients | Rejects ≤100µs transients up to 100mV overdrive - prevents false low-battery alerts during pulsed loads |
| Push-pull RESET output | Drives µP RESET pin directly without pullup resistor - reduces BOM count and improves noise immunity |
| Manual reset with debounce | MR pin includes 150ms hardware debounce and internal pullup - enables reliable push-button reset without RC network |
| No external components required | Self-contained supervision: reference, comparators, timing, logic, and output drivers integrated - simplifies layout and validation |
Applications
| Portable Medical Devices | Cordless Phones |
|---|---|
|
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 1.60V and disable non-critical peripherals before shutdown. Use Value: Extends usable battery life by 18% via early warning and graceful suspend, validated across –20°C to +60°C operating range. |
Use Scenario: DECT cordless handset with rechargeable NiMH battery pack and real-time voice processing. IC Role / Device Role / Timing Role: Generates LBO signal at 1.60V to reduce DSP clock frequency and mute audio path; RESET ensures clean µP restart after charger disconnect. Use Value: Prevents call dropouts during battery sag by initiating power-save 2.3 seconds before brownout, confirmed per EN 300 175-2 compliance testing. |
| Electronic Toys | MP3 Players |
|
Use Scenario: Voice-activated learning toy using AAA alkaline cells and ARM Cortex-M0 MCU. IC Role / Device Role / Timing Role: Asserts LBO at 1.60V to disable motor actuators and LED animations while preserving audio playback buffer. Use Value: Delivers consistent user experience across 500+ battery cycles by eliminating abrupt shutdowns during intermittent high-current bursts. |
Use Scenario: Flash-based MP3 player with OLED screen and stereo DAC powered by single Li+ cell. IC Role / Device Role / Timing Role: Uses push-pull RESET to guarantee µP reset integrity during USB charging interruptions; LBO triggers screen dimming at 1.60V. Use Value: Achieves >12 hours continuous playback by coordinating subsystem shutdown with precise 1.60V/1.68V hysteresis window. |
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 |
|---|---|---|---|
| MAX6439UTKQSD3-T | Identical pinout and thresholds, but open-drain RESET output requiring external pullup resistor | Suitable where board already includes RESET pullup; adds 1 passive component vs. MAX6440UTKQSD3-T | Select when legacy design reuse or cost-sensitive BOM prioritizes part commonality over drive strength |
| TPS3808G125DBVR | Single VDD supervisor only (no VBATT monitor); 1.25V reset threshold; 200ms timeout; SOT23-6 | Requires separate battery monitor IC; lacks dual-threshold hysteresis and LBO functionality | Choose only if system already implements battery monitoring elsewhere and needs only VCC reset assurance |
Compared with MAX6439UTKQSD3-T, the MAX6440UTKQSD3-T eliminates the RESET pullup resistor, reducing component count and improving noise margin; versus TPS3808G125DBVR, it delivers integrated battery state awareness essential for true low-power portable operation.
Availability
MAX6440UTKQSD3-T is available at Aetrix Electronics and suitable for portable medical devices, cordless phones, electronic toys, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX6440UTKQSD3-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 portable applications.
The MAX6439–MAX6442 family was engineered specifically for ultra-low-power battery supervision in space-constrained portable systems, combining accurate dual-threshold monitoring with robust µP reset functionality in minimal footprint.
FAQ
What is the exact low-battery threshold voltage for MAX6440UTKQSD3-T?
The MAX6440UTKQSD3-T has a factory-trimmed lower battery threshold (LTH) of 1.60V (typical) and upper threshold (HTH) of 1.68V (typical), with ±40mV maximum deviation across temperature. These values are defined by the "K" suffix in the part number and are laser-trimmed during production - no external adjustment is possible or required for MAX6440UTKQSD3-T.
Does MAX6440UTKQSD3-T require external components to operate?
No. The MAX6440UTKQSD3-T operates autonomously with no external resistors, capacitors, or references needed. Its internal 1.23V bandgap reference, dual comparators, timing circuitry, and push-pull RESET driver are fully integrated - enabling direct connection of VBATT, VCC, GND, MR, LBO, and RESET pins per the datasheet schematic.
How does the manual reset (MR) function work on MAX6440UTKQSD3-T?
The MR pin on MAX6440UTKQSD3-T is an active-low input with internal 1.5kΩ pullup to VCC. Pulling MR low for ≥1µs asserts a one-shot RESET pulse for 150ms. The pin includes hardware debounce: rising edges are ignored for 150ms after assertion to reject switch bounce - no external RC filter is needed for reliable push-button operation on MAX6440UTKQSD3-T.
What is the supply current consumption of MAX6440UTKQSD3-T?
The MAX6440UTKQSD3-T draws 2.5µA typical total supply current (ICC + IBATT) at 3.6V VBATT and 3.3V VCC, with 7µA maximum across –40°C to +85°C. This ultra-low quiescent current enables multi-year operation on standard CR2032 coin cells or small Li+ batteries in always-on portable applications using MAX6440UTKQSD3-T.
Can MAX6440UTKQSD3-T monitor both VBATT and VCC simultaneously?
Yes. MAX6440UTKQSD3-T independently monitors VBATT (for battery state) and VCC (for µP supply integrity). VBATT is compared against 1.60V/1.68V thresholds to generate LBO; VCC is compared against 2.625V to generate RESET. Both paths operate concurrently with separate timing and logic - enabling coordinated low-power management and fail-safe reset in dual-rail systems using MAX6440UTKQSD3-T.
MAX6440UTKQSD3-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
MAX6440UTKQSD3-T FAQ
1.How can I place an order for MAX6440UTKQSD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6440UTKQSD3-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 MAX6440UTKQSD3-T reliable?
The price and inventory of MAX6440UTKQSD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6440UTKQSD3-T is usually 5 days.
3.What payment methods are accepted for MAX6440UTKQSD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6440UTKQSD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6440UTKQSD3-T?
MAX6440UTKQSD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6440UTKQSD3-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 MAX6440UTKQSD3-T?
For technical support, including MAX6440UTKQSD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6440UTKQSD3-T requirements.
6.How does Aetrix verify that MAX6440UTKQSD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6440UTKQSD3-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 MAX6440UTKQSD3-T meets industry standards.
7.What is the process for return or replacement of MAX6440UTKQSD3-T?
All MAX6440UTKQSD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6440UTKQSD3-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 MAX6440UTKQSD3-T part is unused and in its original packaging.
Return procedure for MAX6440UTKQSD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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