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Microchip Technology MCP73843-410I/MS
- Part No.:
- MCP73843-410I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73843-410I/MS.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:449
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Product details
Overview
MCP73843-410I/MS from Microchip Technology is a linear lithium-ion battery charge management controller for single-cell 4.1V Li-ion/Li-Po packs. It delivers ±0.5% voltage regulation accuracy, programmable fast-charge current via external sense resistor, preconditioning for deeply depleted cells, automatic end-of-charge detection at ~7% IREG, and open-drain STAT1 status output. It operates from 4.5V to 12V input and supports cradle-based portable chargers.
For engineers reviewing the MCP73843-410I/MS datasheet, MCP73843-410I/MS pinout, MCP73843-410I/MS application, or MCP73843-410I/MS equivalent, key selection criteria include its 4.1V fixed regulation voltage, absence of integrated thermistor monitoring (vs. MCP73841), MSOP-8 package footprint, and compatibility with external P-channel MOSFET gate drive for thermal and layout flexibility in space-constrained handheld devices.
Technical Context
The MCP73843-410I/MS implements a three-phase charge algorithm: qualification/preconditioning (trickle-charge below 2.70–2.90V), constant-current fast charge (regulated by VFCS = 100–120mV across RSENSE), and constant-voltage regulation at 4.1V ±0.5%. It uses an internal precision voltage reference (1.2V) and analog comparators for UVLO (4.25–4.60V start), recharge threshold (VREG −300mV), and termination (VFCS ≤7mV).
Unlike the 10-pin MCP73841, the MCP73843-410I/MS omits THREF and THERM pins-removing continuous cell temperature monitoring-and integrates identical safety timers (precondition: 45–75 min; fast-charge: 1.1–1.9 hr; elapsed: 2.2–3.8 hr) scaled by a single 0.1µF capacitor on TIMER. Its DRV output sinks up to 2mA to drive the gate of an external P-MOSFET in linear mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.100 V ±0.5% - precise termination point for graphite-anode Li-ion cells; avoids overvoltage stress and extends cycle life. |
| Input Voltage Range | 4.5 V to 12 V - supports common wall adapters and USB-powered inputs while ensuring stable operation above UVLO threshold. |
| Fast-Charge Threshold | 100–120 mV across RSENSE - sets IREG with 1% tolerance sense resistors; enables accurate 100mA–2A charge currents. |
| Precondition Threshold | 2.70–2.90 V on VBAT - initiates safe trickle-charge for cells discharged below safe operating voltage. |
| Charge Termination | ≤7 mV across RSENSE - detects end-of-charge at ~7% of fast-charge current; prevents overcharging without host MCU intervention. |
| Operating Temp | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Package | MSOP-8 - 3mm × 3mm footprint with 0.65mm pitch; enables compact PCB layouts in handheld devices. |
Pinout & Package
Package: MSOP-8 (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE | Current-sense input | Voltage drop across external RSENSE sets fast-charge current; 100–120 mV range allows high-accuracy current programming. |
| 2 VDD | Supply input | 4.5–12 V power source; includes UVLO (4.25–4.60 V start) and auto-power-down when removed. |
| 3 STAT1 | Status output | Open-drain, current-limited output; drives LED directly or interfaces to MCU GPIO with pull-up. |
| 4 EN | Enable control | Active-high logic input; forces charge start/stop/fault clear; reduces supply current to 0.25 µA in sleep mode. |
| 5 TIMER | Safety timer capacitor node | Connects to 0.1 µF capacitor to set all three safety timers (precondition, fast-charge, elapsed). |
| 6 VSS | Ground reference | 0 V return for battery negative terminal and internal circuitry; must be low-impedance connection. |
| 7 VBAT | Battery voltage sense | Direct connection to battery positive; internal divider regulates to 4.100 V; bypass with ≥4.7 µF for stability. |
| 8 DRV | MOSFET gate driver | Sinks up to 2 mA to control external P-channel MOSFET; linear-mode operation enables precise CV/CC regulation. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% voltage regulation accuracy | Ensures consistent 4.100 V termination across temperature and line/load variations-critical for Li-ion cell longevity and safety compliance. |
| No integrated thermistor interface | Reduces BOM count and simplifies layout vs. MCP73841; suitable for applications where ambient temperature control suffices. |
| Programmable fast-charge current | Enables flexible design scaling from 100 mA to >2 A using standard 1% metal-film sense resistors-no DAC or external DAC required. |
| Automatic preconditioning | Applies ~10% IREG trickle-charge below 2.7–2.9 V to safely recover deeply discharged cells without user intervention. |
| Three independent safety timers | Prevents thermal runaway: precondition (45–75 min), fast-charge (1.1–1.9 hr), and elapsed-time (2.2–3.8 hr) timers-all set by one capacitor. |
Applications
| Smartphone Cradle Charger | Digital Camera Battery Dock |
|---|---|
Use Scenario: Desktop charging station that accepts removable Li-ion battery packs from smartphones. IC Role / Device Role / Timing Role: Standalone linear charger IC managing full CC/CV profile, status indication via dual-color LED, and fault-safe termination. Use Value: Eliminates need for host MCU supervision; 4.1V regulation matches OEM battery specs; MSOP-8 eases mechanical integration into compact cradle housing. | Use Scenario: Rechargeable battery dock for DSLR or mirrorless camera systems with hot-swap capability. IC Role / Device Role / Timing Role: Primary charge controller regulating 4.1V single-cell Li-Po pack; STAT1 signals charge progress and completion to front-panel LED. Use Value: Preconditioning recovers batteries left fully discharged; fast-charge timer prevents overcharge during unattended overnight charging. |
| Bluetooth Headset Charging Case | Portable Medical Monitor Backup Pack |
Use Scenario: Compact charging case for true wireless stereo (TWS) earbuds with integrated 300–500 mAh Li-ion cell. IC Role / Device Role / Timing Role: Linear charge manager delivering regulated 4.1V output; EN pin enables charge enable/disable via case lid switch. Use Value: Low quiescent current (0.25 µA sleep) preserves case battery; small MSOP-8 footprint fits tight cavity; no thermistor routing needed. | Use Scenario: Portable clinical device with field-replaceable backup battery requiring reliable, certified charging behavior. IC Role / Device Role / Timing Role: Safety-critical charge controller enforcing strict voltage accuracy (±0.5%), automatic termination, and UVLO protection. Use Value: Meets IEC 62368-1 requirements for battery management; 4.1V setting aligns with medical-grade Li-ion cells optimized for long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear lithium-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73843-420I/MS | Fixed 4.2V regulation voltage instead of 4.1V; otherwise identical pinout, timing, and feature set. | Designed for graphite-anode Li-ion cells requiring higher termination voltage; not interchangeable without battery chemistry validation. | Select only if battery datasheet specifies 4.200 V ±0.5% termination; verify cell voltage tolerance and cycle-life impact. |
| BQ24040DRCT | TI part with integrated MOSFET, thermal regulation, and I2C interface; different pinout and no direct replacement. | Requires PCB redesign; adds system-level telemetry but increases BoM cost and complexity. | Choose when host MCU communication, thermal foldback, or reduced external component count outweighs footprint and cost constraints. |
Compared with MCP73843-420I/MS, the MCP73843-410I/MS provides tighter voltage margin for coke-anode or aging Li-ion cells, reducing risk of overvoltage stress. Compared with BQ24040DRCT, it offers lower system cost and simpler layout but requires discrete MOSFET selection and lacks digital control.
Availability
MCP73843-410I/MS is available at Aetrix Electronics and suitable for smartphone cradle chargers, digital camera battery docks, Bluetooth headset cases, portable medical monitors, and handheld test instruments requiring stable component supply and long-term production continuity.
Supply support for MCP73843-410I/MS 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
Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP7384X family was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully autonomous, analog-based Li-ion/Li-Po charging-eliminating firmware dependencies while maintaining safety and precision.
FAQ
What is the exact regulated output voltage of the MCP73843-410I/MS?
The MCP73843-410I/MS provides a fixed regulated output voltage of 4.100 V with a maximum tolerance of ±0.5% (4.079 V to 4.121 V) across −5°C to +55°C ambient temperature and 10 mA load. This value is factory-trimmed and specified in the DS21823D datasheet Table 1-1 under "Regulated Output Voltage" for MCP73843-4.1 variants.
Does the MCP73843-410I/MS support battery temperature monitoring?
No, the MCP73843-410I/MS does not support battery temperature monitoring. It lacks the THREF and THERM pins present on the MCP73841/MCP73842 variants. Temperature sensing is omitted to reduce package size (MSOP-8 vs. MSOP-10) and simplify design for applications where ambient thermal management suffices.
How is the fast-charge current programmed on the MCP73843-410I/MS?
The fast-charge current is programmed by selecting an external sense resistor (RSENSE) between VDD and the external P-MOSFET source. The MCP73843-410I/MS regulates the voltage across RSENSE to 100–120 mV (VFCS). For example, a 100 mΩ resistor yields ~1.0 A IREG; a 200 mΩ resistor yields ~0.5 A. The formula is RSENSE = VFCS / IREG.
What safety timers are implemented in the MCP73843-410I/MS and how are they configured?
The MCP73843-410I/MS implements three safety timers: precondition (45–75 min), fast-charge (1.1–1.9 hr), and elapsed-time termination (2.2–3.8 hr). All are scaled by a single capacitor (CTIMER) connected from TIMER pin to VSS. A 0.1 µF capacitor sets nominal values; timing scales linearly with capacitance (e.g., 0.2 µF doubles all periods).
Can the MCP73843-410I/MS be used with a dual-cell (8.2V/8.4V) battery pack?
No, the MCP73843-410I/MS is strictly for single-cell Li-ion/Li-Po applications with 4.1V regulation. Dual-cell support requires MCP73842 or MCP73844 variants (8.2V/8.4V), which have different input voltage ranges (8.7–12V), precondition thresholds (~5.4–5.9V), and pinouts. Using MCP73843-410I/MS with an 8.2V pack would result in undercharging and failure to reach full capacity.
MCP73843-410I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- -
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP73843-410I/MS FAQ
1.How can I place an order for MCP73843-410I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73843-410I/MS 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 MCP73843-410I/MS reliable?
The price and inventory of MCP73843-410I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73843-410I/MS is usually 5 days.
3.What payment methods are accepted for MCP73843-410I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73843-410I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73843-410I/MS?
MCP73843-410I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73843-410I/MS 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 MCP73843-410I/MS?
For technical support, including MCP73843-410I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73843-410I/MS requirements.
6.How does Aetrix verify that MCP73843-410I/MS is sourced from the original manufacturer or authorized distributors?
All MCP73843-410I/MS 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 MCP73843-410I/MS meets industry standards.
7.What is the process for return or replacement of MCP73843-410I/MS?
All MCP73843-410I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP73843-410I/MS, 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 MCP73843-410I/MS part is unused and in its original packaging.
Return procedure for MCP73843-410I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP73843-410I/MS Tags
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BQ21040DBVR
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