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Analog Devices Inc./Maxim Integrated MAX6847KASD3
- Part No.:
- MAX6847KASD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- SOT-23-8
- Datasheet:
-
MAX6847KASD3.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
The MAX6847KASD3 from Maxim Integrated is a single-output, ultra-low-power battery monitor with integrated microprocessor supervisor and push-pull active-low RESET output. It features user-adjustable low-battery thresholds (615mV typical), 150ms LBO timeout, factory-set 2.925V VCC reset threshold, and operates from -40°C to +85°C in an 8-pin SOT23 package. It is used in portable medical devices to signal battery depletion before system shutdown.
For engineers reviewing the MAX6847KASD3 datasheet, MAX6847KASD3 pinout, MAX6847KASD3 application, or MAX6847KASD3 equivalent, this page delivers verified electrical parameters, functional pin roles, real-world use cases for Li+ and alkaline/NiMH systems, and validated alternative parts with documented differences in reset topology and output configuration.
Technical Context
The MAX6847KASD3 integrates a precision 615mV internal reference, dual comparators for adjustable LTHIN/HTHIN monitoring, and independent VCC supervision logic. Its push-pull RESET output is referenced to VCC and guaranteed functional down to VCC ≥ 1.0V, while LBO assertion/deassertion is governed by 150ms minimum timeout after threshold crossing.
It implements MR input debouncing (150–225ms rising-edge debounce), glitch rejection (100ns), and manual reset pulse generation with 150ms timeout. The device draws only 2.5µA typical supply current at 3.6V/3.3V and supports direct battery monitoring with open-drain LBO capable of interfacing to voltages up to 5.5V independent of VDD/VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Operating Range | 1.6V to 5.5V - powers device when higher than VCC; enables direct battery connection |
| VCC Reset Threshold | 2.925V (factory-trimmed, ±75mV) - triggers active-low RESET when VCC drops below this level |
| LBO Thresholds | 615mV typical (±15mV) - sets low-battery detection point via external resistor divider on LTHIN/HTHIN |
| LBO Timeout Period | 150ms minimum - prevents chatter during battery recovery; ensures stable voltage before deassertion |
| Supply Current | 2.5µA typical at 3.6V/3.3V - enables multi-year operation in coin-cell-powered devices |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup; drives high/low directly to VCC |
| Operating Temp | -40°C to +85°C - qualified for industrial and portable medical environments |
Pinout & Package
Package: 8-pin SOT23-8 (3.00mm × 2.60mm × 1.45mm body, 0.65mm pitch). Pin 1 marked with dot; lead finish available in leaded or lead-free (replace -T with +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Device powers from VDD if VDD > VCC; accepts 1.6V–5.5V; connects to battery or regulated rail |
| GND | Analog/digital ground reference | Common return for all internal circuits; must be low-impedance path to system ground |
| LTHIN | Low-threshold monitor input | Resistor-divider node setting VLTH (615mV); falling below VLTH asserts LBO |
| LBO | Active-low open-drain low-battery output | Signals battery depletion; requires external pullup; sinks up to 3.2mA at 4.5V |
| RESET | Active-low push-pull reset output | Drives low to VCC ground during VCC undervoltage or MR assertion; no pullup needed |
| MR | Active-low manual reset input | Internal 1.5kΩ pullup to VCC; debounced rising edge; 1µs min pulse width |
| HTHIN | High-threshold monitor input | Resistor-divider node setting VHTH (615mV); rising above VHTH deasserts LBO after 150ms |
| VCC | VCC supply and reset monitor input | Supplies device if VCC > VDD; monitored for reset generation; range 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable LBO thresholds | Set via external R1/R2/R3 divider on LTHIN/HTHIN; supports single-cell Li+ (3.0–4.2V) and 2–3-cell alkaline/NiMH (2.4–4.5V) |
| 150ms LBO timeout with hysteresis | Prevents false triggering during transient load drops; 5% typical hysteresis avoids oscillation near trip points |
| Push-pull RESET output | Eliminates external pullup resistor; reduces BOM count and board space; improves noise immunity vs. open-drain |
| Manual reset with debounce | MR input includes 150–225ms rising-edge debounce and 100ns glitch rejection - suppresses switch bounce |
| Ultra-low quiescent current | 2.5µA typical at 3.6V/3.3V - extends battery life in always-on portable devices such as glucose meters |
Applications
| Portable Medical Devices | Digital Cameras |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single CR2032 coin cell. IC Role / Device Role / Timing Role: Battery monitor detects voltage sag below 2.7V (LTHIN = 615mV × R-divider), asserts LBO to trigger low-power mode; RESET holds µP in reset if VCC < 2.925V. Use Value: Prevents data loss during battery exhaustion; enables graceful shutdown before sensor calibration fails. | Use Scenario: Compact digital camera using two AA alkaline cells (2.4–3.2V range) with flash LED and LCD display. IC Role / Device Role / Timing Role: LBO signals battery depletion at ~2.5V; RESET disables main processor when VCC falls below 2.925V; MR allows user-initiated reset without power cycle. Use Value: Extends usable runtime by switching to low-power capture mode before shutdown; avoids unexpected power-off mid-shot. |
| Cell Phones / Cordless Phones | MP3 Players |
Use Scenario: DECT cordless phone base station with rechargeable NiMH pack (3.6–4.2V) and standby monitoring. IC Role / Device Role / Timing Role: Monitors pack voltage via VDD; LBO warns of low charge state; push-pull RESET ensures clean µP reset during AC adapter dropout. Use Value: Maintains call log integrity during brownout; eliminates need for external RESET pullup resistor. | Use Scenario: Flash-based MP3 player powered by single Li+ cell (3.0–4.2V) with OLED display and audio codec. IC Role / Device Role / Timing Role: LBO triggers display dimming and audio rate reduction at 3.3V; RESET prevents corrupted firmware writes during voltage dip. Use Value: Increases perceived battery life by adaptive power scaling; guarantees safe shutdown before file system corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor with µP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6846KASD3 | Open-drain RESET output; identical LBO, thresholds, and timing; same SOT23-8 package | Requires external pullup on RESET; suitable where board layout already accommodates pullup or noise immunity favors open-drain | Select when RESET line must interface with multiple devices sharing a wired-OR bus |
| TLV809E29DBZR | Fixed 2.93V reset threshold; no adjustable LBO; no LTHIN/HTHIN inputs; SOT23-3 package | Only provides VCC reset function; lacks battery monitoring capability; cannot replace LBO functionality | Select only for simple reset-only applications where battery monitoring is handled elsewhere |
Compared with MAX6846KASD3, the MAX6847KASD3 offers push-pull RESET for lower component count and faster rise time, while TLV809E29DBZR sacrifices battery monitoring entirely for minimal footprint and cost in non-battery-critical systems.
Availability
MAX6847KASD3 is available at Aetrix Electronics and suitable for portable medical devices, digital cameras, and cordless phones requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6847KASD3 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 consumer applications.
The MAX6847KASD3 belongs to the MAX6846–MAX6849 family of ultra-low-power battery monitors with integrated µP supervisors, engineered specifically for reliable state-of-charge signaling and robust reset control in space-constrained, battery-operated systems.
FAQ
What is the exact VCC reset threshold voltage for MAX6847KASD3?
The MAX6847KASD3 has a factory-trimmed VCC reset threshold of 2.925V (nominal), with a tolerance of ±75mV over temperature. This value is fixed and corresponds to the "S" suffix in the ordering code per Table 1 of the datasheet. The threshold is guaranteed across the full -40°C to +85°C operating range and does not require external programming.
Does MAX6847KASD3 support dual low-battery outputs like MAX6849?
No, MAX6847KASD3 provides only a single low-battery output (LBO). It belongs to the MAX6846/MAX6847 subgroup, which uses one comparator pair and one LBO pin. Dual outputs (LBOL and LBOH) are exclusive to MAX6848/MAX6849 variants. Using MAX6847KASD3 in a dual-output design would require external logic or redesign.
What is the purpose of the HTHIN and LTHIN pins on MAX6847KASD3?
The HTHIN and LTHIN pins on MAX6847KASD3 form a resistor-divider network that sets the high and low battery trip points relative to the internal 615mV reference. LTHIN determines the voltage at which LBO asserts (e.g., 2.7V battery = 615mV at LTHIN), and HTHIN sets the voltage at which LBO deasserts after 150ms stabilization. Both pins have leakage <20nA to preserve accuracy.
Can MAX6847KASD3 operate with VCC below 1.8V?
Yes, MAX6847KASD3 operates with VCC as low as 1.2V, per its absolute specifications. However, the RESET output is only guaranteed functional down to VCC ≥ 1.0V (push-pull), and VCC reset detection remains valid across the full 1.2V–5.5V range. Below 1.53V, the reset threshold shifts slightly but remains within datasheet limits.
How does the manual reset (MR) function interact with the VCC reset on MAX6847KASD3?
On MAX6847KASD3, MR and VCC reset are independent: pulling MR low generates a one-shot RESET pulse with 150ms timeout, regardless of VCC level. If VCC drops below 2.925V during MR assertion, both sources hold RESET low. The internal timer restarts if VCC falls again before timeout completes, ensuring deterministic reset behavior under dynamic supply conditions.
MAX6847KASD3 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
MAX6847KASD3 FAQ
1.How can I place an order for MAX6847KASD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6847KASD3 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 MAX6847KASD3 reliable?
The price and inventory of MAX6847KASD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6847KASD3 is usually 5 days.
3.What payment methods are accepted for MAX6847KASD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6847KASD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6847KASD3?
MAX6847KASD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6847KASD3 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 MAX6847KASD3?
For technical support, including MAX6847KASD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6847KASD3 requirements.
6.How does Aetrix verify that MAX6847KASD3 is sourced from the original manufacturer or authorized distributors?
All MAX6847KASD3 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 MAX6847KASD3 meets industry standards.
7.What is the process for return or replacement of MAX6847KASD3?
All MAX6847KASD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6847KASD3, 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 MAX6847KASD3 part is unused and in its original packaging.
Return procedure for MAX6847KASD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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