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Analog Devices Inc./Maxim Integrated MAX6846KAWD3-T
- Part No.:
- MAX6846KAWD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-8
- Datasheet:
-
MAX6846KAWD3-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6846KAWD3-T from Maxim Integrated is an ultra-low-power, user-adjustable battery monitor with integrated microprocessor supervisor. It features a single open-drain low-battery output (LBO), factory-set 1.665V VCC reset threshold, 150ms minimum reset timeout, 2.5µA typical supply current at 3.6V, and operates across –40°C to +85°C. It is used in single-cell Li+ or multicell alkaline/NiMH portable devices to manage power sequencing and battery-state signaling.
For engineers reviewing the MAX6846KAWD3-T datasheet, MAX6846KAWD3-T pinout, MAX6846KAWD3-T application, or MAX6846KAWD3-T equivalent, this page delivers verified electrical parameters, SOT23-8 terminal mapping, hysteresis behavior, manual reset timing, and direct alternatives for battery-monitoring system design.
Technical Context
The MAX6846KAWD3-T integrates a precision 615mV internal reference, dual comparators for LTHIN/HTHIN threshold detection, and independent VCC supervision logic. Its LBO assertion is triggered when LTHIN falls below 615mV (typ), with hysteresis ensuring stable deassertion only after HTHIN rises above the same threshold for ≥150ms.
VCC monitoring uses a fixed 1.665V reset threshold (W-suffix) with 150ms minimum timeout (D3-suffix); RESET is open-drain active-low. The MR input includes 1.5kΩ internal pullup and 150–225ms rising-edge debounce to suppress switch bounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.665V (W-suffix), enabling reliable reset assertion for 1.8V–3.3V systems with ±45mV tolerance |
| LBO Trip Voltage | 615mV (typ) on LTHIN/HTHIN inputs, adjustable via external resistor divider for Li+/alkaline/NiMH battery profiles |
| Supply Current | 2.5µA (typ at 3.6V), supporting multi-year operation in coin-cell–powered devices |
| Reset Timeout | 150ms (min), ensuring stable VCC recovery before releasing µP reset signal |
| LBO Timeout | 150ms (min), preventing premature deassertion during transient voltage recovery |
| Operating Temp | –40°C to +85°C, qualified for industrial and portable consumer environments |
| Package | SOT23-8, 3.0mm × 2.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6846KAWD3-T is housed in an 8-pin SOT23 package with 0.65mm pitch, JEDEC MO-178 compliant, and specified for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Accepts 1.6V–5.5V; powers device when higher than VCC; enables direct battery connection |
| GND | Analog/digital ground reference | Common return for all internal circuits and external resistor dividers |
| LTHIN | Low-threshold monitor input | Resistor-divider node setting LBO assertion point; 615mV (typ) trip level with 5% hysteresis |
| LBO | Active-low, open-drain low-battery output | Signals battery depletion; sinks up to 3.2mA; compatible with 5.5V logic interfaces |
| RESET | Active-low, open-drain reset output | Asserts when VCC < 1.665V; holds low for ≥150ms after VCC recovery; requires external pullup |
| MR | Active-low manual reset input | Internal 1.5kΩ pullup to VCC; debounced rising edge; initiates one-shot 150ms reset pulse |
| HTHIN | High-threshold monitor input | Resistor-divider node setting LBO deassertion point; matches LTHIN trip level for single-output mode |
| VCC | VCC supply and reset monitor input | Monitors 1.2V–5.5V system rail; triggers RESET when falling below 1.665V threshold |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable battery thresholds | Configurable LTHIN/HTHIN trip points via external resistors enable precise adaptation to Li+, NiMH, or alkaline cell discharge curves |
| Integrated µP supervisor | Dedicated VCC monitoring with factory-trimmed 1.665V reset threshold eliminates need for external reset IC in space-constrained designs |
| 150ms LBO and RESET timeouts | Guaranteed minimum delay prevents chatter during battery voltage recovery and ensures stable power-up sequencing |
| Ultra-low quiescent current | 2.5µA typical supply current extends battery life in always-on monitoring applications such as medical wearables and remote sensors |
| Manual reset with debounce | MR pin includes hardware-level 150–225ms rising-edge debounce, removing need for external RC filtering or firmware debouncing |
Applications
| Portable Medical Devices | Digital Cameras |
|---|---|
Use Scenario: Continuous glucose monitor powered by a single Li+ cell requiring low-power state management and end-of-life warning. IC Role / Device Role / Timing Role: MAX6846KAWD3-T monitors battery voltage via LTHIN/HTHIN, asserts LBO to trigger sleep mode, and asserts RESET if VCC drops below 1.665V during data transmission. Use Value: 2.5µA supply current enables >5-year battery life; 150ms LBO timeout prevents false low-battery alerts during brief load transients. | Use Scenario: Compact digital camera using two alkaline cells where battery depletion must be signaled before flash or image processing fails. IC Role / Device Role / Timing Role: MAX6846KAWD3-T's LBO output warns MCU of low battery; its open-drain RESET ensures clean µP restart if main rail sags during high-current flash charging. Use Value: Adjustable thresholds accommodate alkaline voltage decay profile; 1.665V VCC reset aligns with 1.8V logic supply margin. |
| Cell Phones | Electronic Toys |
Use Scenario: Feature phone with removable Li+ battery needing accurate low-battery indication and safe shutdown sequencing. IC Role / Device Role / Timing Role: MAX6846KAWD3-T compares battery voltage against 615mV reference; LBO activates backlight dimming and display warning; RESET forces controlled boot on power restoration. Use Value: Single LBO output simplifies interface to baseband processor GPIO; SOT23-8 footprint fits tight RF module layouts. | Use Scenario: Voice-enabled educational toy powered by three AA alkaline cells requiring graceful power-down before complete discharge. IC Role / Device Role / Timing Role: MAX6846KAWD3-T detects declining battery via resistor divider on LTHIN; LBO disables motor drivers and audio amplifier; RESET prevents corrupted EEPROM writes during brownout. Use Value: Immunity to short voltage transients avoids spurious resets during button press noise; –40°C rating supports outdoor use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6847KAWD3-T | Push-pull RESET output (vs. open-drain); identical VCC threshold (1.665V), LBO behavior, and pinout | Eliminates need for external RESET pullup resistor; better suited for systems with strict rise-time requirements on reset signal | Select MAX6847KAWD3-T when driving RESET directly into µP reset pin without pullup; otherwise MAX6846KAWD3-T reduces BOM count. |
| TPS3808G16DBVR | Fixed 1.6V reset threshold (±0.5%), 200ms timeout, 1.6µA IQ, SOT23-6 package; no LBO or adjustable battery monitoring | Provides only VCC supervision-no battery-state signaling; lacks LTHIN/HTHIN inputs and LBO functionality | Choose TPS3808G16DBVR only for pure reset supervision; MAX6846KAWD3-T is required when battery voltage tracking and low-battery alerting are needed. |
Compared with MAX6847KAWD3-T, MAX6846KAWD3-T saves one external component but requires a pullup on RESET; versus TPS3808G16DBVR, it adds full battery monitoring capability at the cost of two extra pins and higher complexity-making it essential for dual-function (supervision + battery state) portable systems.
Availability
MAX6846KAWD3-T is available at Aetrix Electronics and suitable for portable medical devices, digital cameras, and electronic toys requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6846KAWD3-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 management, sensing, and interface applications.
The MAX6846–MAX6849 family was developed specifically for ultra-low-power battery monitoring and microprocessor supervision in space- and energy-constrained portable electronics.
FAQ
What is the exact VCC reset threshold voltage for MAX6846KAWD3-T?
The MAX6846KAWD3-T has a factory-trimmed VCC reset threshold of 1.665V (W-suffix), with a guaranteed range of 1.620V to 1.710V over temperature. This value is fixed and non-adjustable, selected at manufacture per the ordering code "W" in the part number, and applies to all operating conditions within the –40°C to +85°C range.
Does MAX6846KAWD3-T support dual low-battery outputs?
No, MAX6846KAWD3-T provides only a single low-battery output (LBO). Dual outputs (LBOL and LBOH) are exclusive to the MAX6848/MAX6849 variants. The MAX6846KAWD3-T uses shared LTHIN and HTHIN inputs to set one adjustable trip point, with LBO asserting on LTHIN fall and deasserting after HTHIN rise-functionally equivalent to a single-threshold hysteresis detector.
How is the low-battery threshold programmed on MAX6846KAWD3-T?
The low-battery threshold on MAX6846KAWD3-T is programmed externally using a three-resistor divider network connected to LTHIN and HTHIN pins. With a 615mV internal reference, R1/R2/R3 values determine trip points; RTOTAL up to 500kΩ is supported. Example: For a 3.0V Li+ cutoff at 2.8V, calculate R3 = RTOTAL × (615mV / 2.8V), then derive R2 and R1 to achieve desired hysteresis.
What is the function of the MR pin on MAX6846KAWD3-T?
The MR (Manual Reset) pin on MAX6846KAWD3-T is an active-low input with internal 1.5kΩ pullup to VCC. Pulling MR low initiates a one-shot 150ms (min) active-low RESET pulse. It includes hardware debounce (150–225ms rising-edge filter) to reject switch bounce, eliminating need for external RC networks or firmware handling in pushbutton reset implementations.
Is MAX6846KAWD3-T RoHS-compliant and available in lead-free packaging?
Yes, MAX6846KAWD3-T is RoHS-compliant and available in lead-free packaging. Per Maxim's ordering guide, the "-T" suffix denotes standard leaded packaging; lead-free versions use "+T" (e.g., MAX6846KAWD3+T). Tape-and-reel delivery is standard, with 2500-piece minimum order quantity for standard versions.
MAX6846KAWD3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- 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-23-8
MAX6846KAWD3-T FAQ
1.How can I place an order for MAX6846KAWD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6846KAWD3-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 MAX6846KAWD3-T reliable?
The price and inventory of MAX6846KAWD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6846KAWD3-T is usually 5 days.
3.What payment methods are accepted for MAX6846KAWD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6846KAWD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6846KAWD3-T?
MAX6846KAWD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6846KAWD3-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 MAX6846KAWD3-T?
For technical support, including MAX6846KAWD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6846KAWD3-T requirements.
6.How does Aetrix verify that MAX6846KAWD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6846KAWD3-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 MAX6846KAWD3-T meets industry standards.
7.What is the process for return or replacement of MAX6846KAWD3-T?
All MAX6846KAWD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6846KAWD3-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 MAX6846KAWD3-T part is unused and in its original packaging.
Return procedure for MAX6846KAWD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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