MCP73843-420I/MS Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP73843-420I/MS is a single-cell Li-Ion battery charge controller with 4.2 V preset termination voltage, constant current/constant voltage algorithm, and programmable charge current via external resistor. Available in MSOP-8 package, RoHS compliant, in stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP73843-420I/MS Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2588(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP73843-420I/MS?
- Preset 4.2 V termination voltage for standard Li-Ion single-cell charging with ±1% accuracy using CC/CV algorithm without firmware overhead
- Programmable charge current set by a single external resistor from 15 mA to 500 mA supporting both thin-film and cylindrical Li-Ion cell capacities
- Integrated charge status output and preconditioning for deeply discharged cells below 3 V enabling safe recovery charging in portable electronics designs
What is MCP73843-420I/MS used for?
The MCP73843-420I/MS provides standalone single-cell Li-Ion charging for portable electronics such as Bluetooth headsets, handheld instruments, and wearable fitness devices where a USB 5 V or wall adapter powers the charge circuit directly without a host microcontroller. Its external resistor-set charge current allows designers to match charge rate to cell capacity, supporting 100 mA for small 300 mAh pouch cells up to 500 mA for larger 1000 mAh cylindrical formats. The MSOP-8 package with minimal external components reduces BOM count and PCB area, making it a low-cost alternative to integrated PMIC solutions in simple single-battery products.
What are the specifications of MCP73843-420I/MS?
| Pbfree Code | Yes |
| Manufacturer Package Code | MSOP-8 |
| Reach Compliance Code | Compliant |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Adjustable Threshold | YES |
| Analog IC - Other Type | BATTERY MONITOR |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Current-Max (Isup) | 4mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5.2V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +4.2V |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP73843-420I/MS datasheet?
MCP73843-420I/MS Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP73843-420I/MS?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What termination voltage does the MCP73843-420I/MS use, and how accurate is it for protecting Li-Ion cells?
The MCP73843-420I/MS uses a factory-preset 4.2 V charge termination voltage with ±1% accuracy, meaning the actual cutoff falls between 4.158 V and 4.242 V. This tight tolerance prevents Li-Ion cell overcharge above 4.2 V while maximizing capacity utilization, complying with cell manufacturer safety requirements without requiring an external precision reference or MCU firmware.
How is the charge current configured on the MCP73843, and what range does it support?
Charge current on the MCP73843 is set by a single external resistor connected to the PROG pin. The resistor value is calculated as approximately 1000 V/A divided by the desired charge current in amperes, enabling programmable rates from 15 mA for small 30 mAh pouch cells up to 500 mA for 1000 mAh cylindrical Li-Ion cells without firmware or DAC components.
Does the MCP73843-420I/MS support preconditioning of deeply discharged Li-Ion cells, and why is this important?
Yes, the MCP73843-420I/MS applies a low preconditioning current of approximately 10% of the programmed fast charge current when cell voltage is below 3 V. This slow-rate recovery phase prevents thermal runaway in cells discharged below the safe low-voltage limit, recovering cell capacity safely before transitioning to the full constant-current phase at voltages above 3 V.
What external component count does a typical MCP73843-420I/MS Li-Ion charger circuit require?
A complete MCP73843 charger circuit requires only the MSOP-8 IC, a single charge-current programming resistor, one input decoupling capacitor of 1 µF to 10 µF, and one output bypass capacitor, totaling 4 components. This minimal BOM and small 5 mm x 3 mm board footprint makes it the cost-effective solution for USB-charged single-cell product designs.
In what portable applications is the MCP73843-420I/MS preferred over a fully integrated PMIC with charging?
The MCP73843-420I/MS is preferred in cost-sensitive single-cell designs such as Bluetooth earbuds, portable sensors, and handheld barcode scanners where Li-Ion charging is the only power management function needed and a full PMIC's multiple buck converters and LDOs add unnecessary cost and quiescent current exceeding 1 mA. The dedicated charge controller's simplicity reduces firmware complexity and eliminates I2C configuration overhead.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.7600 | $1.76 |
| 25+ | $1.4700 | $36.75 |
| 50+ | $1.3600 | $68.00 |
| 100+ | $1.3059 | $130.59 |
| 200+ | $1.2600 | $252.00 |
| 500+ | $1.2588 | $629.40 |
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