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Analog Devices Inc./Maxim Integrated MAX6849KASD3-T
- Part No.:
- MAX6849KASD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-8
- Datasheet:
-
MAX6849KASD3-T.pdf
- Description:
- IC BATT MON MULT-CHEM 2C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6849KASD3-T from Maxim Integrated is a dual-output, ultra-low-power battery monitor with integrated microprocessor supervisor and push-pull RESET output. It features user-adjustable low-battery thresholds (582mV/615mV hysteresis), 150ms LBO timeout, 150ms MR reset timeout, and factory-set 3.075V VCC reset threshold with 150ms timeout. It operates from -40°C to +85°C in portable medical devices and single-cell Li+ systems.
For engineers reviewing the MAX6849KASD3-T datasheet, MAX6849KASD3-T pinout, MAX6849KASD3-T application, or MAX6849KASD3-T equivalent, key selection considerations include dual LBOH/LBOL signaling for graded battery state awareness, push-pull RESET compatibility with 3.3V µP I/O, manual reset debouncing, and SOT23-8 footprint suitability for space-constrained battery-powered designs.
Technical Context
The MAX6849KASD3-T implements two independent comparator channels - one for LBOL (low-threshold detection at 582mV/615mV) and one for LBOH (high-threshold detection at 582mV/615mV) - each with 5% typical hysteresis and 150ms deassertion timeout. Its internal 615mV reference enables precise resistor-divider programming of battery trip points for single-cell Li+ or multicell alkaline/NiMH systems.
It integrates a separate VCC supervisor with fixed 3.075V reset threshold (±75mV), 150ms timeout, and push-pull active-low RESET output referenced to VCC. The MR input includes 1.5kΩ internal pullup, 150ms rising-edge debounce, and 1µs minimum pulse width support for reliable pushbutton reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±75mV - ensures deterministic µP reset when main supply drops below nominal 3.3V rail. |
| LBO Timeout Period | 150ms min - prevents false low-battery assertion during transient voltage recovery after load removal. |
| Supply Current | 2.5µA typ at 3.6V - enables multi-year operation on coin-cell or small Li+ batteries. |
| Operating Temp Range | -40°C to +85°C - supports industrial and portable medical device deployment without derating. |
| RESET Output Type | Push-pull - eliminates need for external pullup and guarantees defined logic high when deasserted. |
| Threshold Reference | 615mV internal bandgap - provides stable, temperature-compensated basis for resistor-programmed battery monitoring. |
| MR Debounce Period | 150ms - suppresses mechanical switch bounce and EMI-induced false resets. |
Pinout & Package
MAX6849KASD3-T is housed in an 8-pin SOT23 package (3.00mm × 2.60mm × 1.45mm), fully specified from -40°C to +85°C, with lead-free option available (+T suffix).
| 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 comparators, reference, and outputs; requires low-impedance layout. |
| LTHIN | Low-threshold monitor input | Resistor-divider node setting LBOL trip point; 20nA leakage preserves accuracy in high-R networks. |
| LBOL | Active-low open-drain low-battery output (low) | Asserts when LTHIN falls below 582mV; deasserts after 150ms when LTHIN rises above 615mV. |
| RESET | Active-low push-pull reset output | Drives low when VCC < 3.075V or MR pulled low; guaranteed logic high when deasserted (no pullup needed). |
| 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 LBOH trip point; identical 20nA leakage and 5% hysteresis as LTHIN. |
| VCC | VCC supervisor input & secondary supply | Monitored for reset; powers device if > VDD; supports 1.2V–5.5V range with 3.075V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent low-battery outputs | LBOL and LBOH provide discrete signals for "battery weak" and "battery empty", enabling tiered power management decisions. |
| User-adjustable thresholds via resistor dividers | Supports precise adaptation to diverse battery chemistries (Li+, NiMH, alkaline) using only three external resistors. |
| 5% typical hysteresis per channel | Prevents output chatter during battery voltage recovery, eliminating need for external RC filtering. |
| Push-pull RESET output | Eliminates external pullup resistor, reduces BOM count, and ensures fast, rail-to-rail logic transitions compatible with 3.3V µPs. |
| 150ms MR debounce and timeout | Guarantees clean, single-pulse reset generation from mechanical switches without firmware intervention. |
Applications
| Portable Medical Devices | Digital Cameras |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters operating on single Li+ cells. IC Role / Device Role / Timing Role: Monitors cell voltage to trigger low-power mode at 3.3V and full shutdown at 2.9V; provides µP reset on VCC brownout. Use Value: Extends usable battery life by 18% through early low-power transition and prevents data corruption via deterministic reset at 3.075V. |
Use Scenario: Compact digital cameras using single-cell Li+ with flash LED and image sensor. IC Role / Device Role / Timing Role: LBOL disables flash driver at 3.0V; LBOH reduces sensor frame rate at 3.4V; RESET ensures clean boot after power-on. Use Value: Enables graceful feature degradation before shutdown, improving user experience and preserving image buffer integrity. |
| Cell Phones / Cordless Phones | MP3 Players |
Use Scenario: Feature phones with alkaline/NiMH battery packs requiring multi-level battery status reporting. IC Role / Device Role / Timing Role: Dual LBO outputs drive distinct UI indicators (e.g., amber LED for low, red LED for critical); MR supports hardware reset button. Use Value: Provides accurate, hysteresis-stabilized battery state feedback without µP polling overhead, reducing system current by 12µA avg. |
Use Scenario: Flash-based MP3 players powered by single Li+ cell with audio codec and display. IC Role / Device Role / Timing Role: LBOL asserts at 3.2V to disable backlight; LBOH asserts at 3.5V to reduce DAC sampling rate; RESET guards against brownout crashes. Use Value: Delivers perceptible battery life extension (≈22 minutes) by proactively throttling non-essential subsystems before critical voltage. |
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 |
|---|---|---|---|
| MAX6848KASD3-T | Open-drain RESET output; same dual-LBO, 3.075V VCC threshold, and 150ms timeouts. | Requires external pullup for RESET; suitable where µP has internal pullup or level-shifting is needed. | Select when interfacing to 5V-tolerant µPs or when open-drain flexibility (e.g., wired-OR) is required. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no battery monitoring; 200ms timeout; 2.5µA quiescent current. | Provides only VCC supervision - lacks LBOH/LBOL outputs and adjustable battery thresholds. | Select only for pure reset supervision; not a functional substitute for battery state monitoring capability. |
Compared with MAX6849KASD3-T, MAX6848KASD3-T offers identical battery monitoring but requires external RESET pullup, while TPS3808G33DBVR delivers lower-cost reset-only functionality without any battery awareness - neither matches the integrated dual-threshold, push-pull advantage of MAX6849KASD3-T.
Availability
MAX6849KASD3-T is available at Aetrix Electronics and suitable for portable medical devices, digital cameras, and cordless phones requiring stable component supply across extended production lifecycles.
Supply support for MAX6849KASD3-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, with deep expertise in ultra-low-power supervision.
The MAX6846–MAX6849 family was engineered specifically for battery-constrained portable electronics, integrating adjustable battery monitoring and µP reset in minimal SOT23-8 footprint to eliminate discrete supervisor + comparator solutions.
FAQ
What is the function of the HTHIN and LTHIN pins on the MAX6849KASD3-T?
The HTHIN and LTHIN pins on the MAX6849KASD3-T serve as high-threshold and low-threshold monitor inputs, respectively. Each accepts a resistor-divider voltage to set the trip points for LBOH and LBOL outputs. Both pins use the internal 615mV reference and exhibit 20nA leakage, enabling precise, low-power threshold programming for single-cell Li+ or multicell alkaline/NiMH batteries. The MAX6849KASD3-T relies on these inputs to generate hysteresis-stabilized battery status signals.
Does the MAX6849KASD3-T support both VDD and VCC power sources simultaneously?
Yes, the MAX6849KASD3-T supports dual-supply operation: VDD (1.6V–5.5V) powers the battery monitor section and can connect directly to the battery, while VCC (1.2V–5.5V) feeds the µP supervisor and reset circuitry. The device automatically selects the higher of VDD or VCC as its internal power source. This architecture allows the MAX6849KASD3-T to monitor battery voltage independently while supervising a separate 3.3V system rail - a key capability confirmed in the MAX6849KASD3-T datasheet's Electrical Characteristics table.
What is the significance of the 'S' and 'D3' suffixes in MAX6849KASD3-T?
In MAX6849KASD3-T, the 'S' denotes the factory-trimmed VCC reset threshold of 2.925V (per Table 1), and 'D3' specifies the 150ms minimum VCC reset timeout period (per Table 2). However, per the Ordering Information table, MAX6849KASD3-T corresponds to a 3.075V threshold - confirming that 'S' here maps to the 3.075V option in Maxim's internal coding. The 'D3' suffix consistently indicates 150ms timeout across all variants. These suffixes define critical supervision behavior and must match system voltage and timing requirements for reliable MAX6849KASD3-T integration.
How does the MAX6849KASD3-T prevent false triggering due to battery voltage transients?
The MAX6849KASD3-T prevents false triggering using three mechanisms: (1) 5% typical hysteresis between LBOH/LBOL assert/deassert thresholds (582mV/615mV), eliminating chatter during recovery; (2) 150ms minimum timeout before deassertion, ensuring voltage stabilization; and (3) immunity to short transients - the device ignores VCC or threshold input spikes under 100ns (MR) or <100µs (LTHIN/HTHIN) per typical operating characteristics. These features are explicitly verified in the MAX6849KASD3-T datasheet's Absolute Maximum Ratings and Timing Diagrams.
Can the MAX6849KASD3-T be used with a 1.8V microprocessor system?
Yes, the MAX6849KASD3-T supports 1.8V µP systems via its VCC supervisor input, which monitors voltages from 1.2V to 5.5V and offers factory-set thresholds down to 1.575V (V suffix). Although MAX6849KASD3-T uses the 'S' suffix (3.075V), other variants like MAX6849KAVD3-T provide 1.575V reset - confirming full 1.8V compatibility across the family. The push-pull RESET output drives valid logic levels (VOH ≥ 0.8×VCC, VOL ≤ 0.3V) at 1.8V, satisfying µP input thresholds without level shifters. This capability is documented in the MAX6849KASD3-T Electrical Characteristics table under RESET Output High/Low specifications.
MAX6849KASD3-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:
- 2
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6849KASD3-T FAQ
1.How can I place an order for MAX6849KASD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6849KASD3-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 MAX6849KASD3-T reliable?
The price and inventory of MAX6849KASD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6849KASD3-T is usually 5 days.
3.What payment methods are accepted for MAX6849KASD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6849KASD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6849KASD3-T?
MAX6849KASD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6849KASD3-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 MAX6849KASD3-T?
For technical support, including MAX6849KASD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6849KASD3-T requirements.
6.How does Aetrix verify that MAX6849KASD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6849KASD3-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 MAX6849KASD3-T meets industry standards.
7.What is the process for return or replacement of MAX6849KASD3-T?
All MAX6849KASD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6849KASD3-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 MAX6849KASD3-T part is unused and in its original packaging.
Return procedure for MAX6849KASD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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