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Microchip Technology MCP73843T-410I/MS
- Part No.:
- MCP73843T-410I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73843T-410I/MS.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,188
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Product details
Overview
MCP73843T-410I/MS from Microchip Technology is a linear lithium-ion/polymer battery charge management controller in an 8-pin MSOP package, featuring 4.1 V ±0.5% voltage regulation, programmable fast-charge current via external sense resistor, preconditioning for deeply depleted cells, automatic end-of-charge detection at ~7% IREG, and -40°C to +85°C operation - used in space-constrained portable devices such as MP3 players and cradle chargers.
For engineers reviewing the MCP73843T-410I/MS datasheet, MCP73843T-410I/MS pinout, MCP73843T-410I/MS application, or MCP73843T-410I/MS equivalent, this page delivers verified technical context, exact pin functions, real-world application cards, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The MCP73843T-410I/MS implements a fully integrated linear charging algorithm: it first validates input supply (UVLO: 4.25–4.60 V), enables preconditioning below 2.70–2.90 V battery voltage, then transitions to constant-current (regulated by 100–120 mV SENSE drop) and constant-voltage (4.1 V ±0.5%) phases. Safety timers - precondition (45–75 min), fast-charge (1.1–1.9 hr), and elapsed-time termination (2.2–3.8 hr) - are set via a single 0.1 µF capacitor on TIMER.
Unlike the 10-pin MCP73841/42 variants, the MCP73843T-410I/MS omits temperature monitoring (no THREF/THERM pins), simplifying thermal design while retaining full charge control logic, open-drain STAT1 status output, EN-driven enable/disable, and DRV-driven external P-channel MOSFET gate drive - making it suitable for cost-sensitive, non-temperature-critical single-cell Li-ion applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.1 V ±0.5% - ensures safe, precise termination for graphite-anode Li-ion cells without overvoltage risk. |
| Input Voltage Range | 4.5 V to 12 V - supports common wall adapters and USB-powered inputs with margin above 4.1 V battery stack. |
| Fast-Charge Current Threshold | 100–120 mV across RSENSE - sets IREG = 100 mV / RSENSE; e.g., 200 mΩ yields 500 mA nominal. |
| Precondition Threshold | 2.70–2.90 V - triggers trickle-charge for deeply discharged cells, preventing damage during recovery. |
| Charge Termination Current | ~7% of IREG - detects end-of-charge via current foldback, enabling reliable CV-phase cutoff. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Package | MSOP-8 - 3 mm × 3 mm footprint with exposed pad; θJA = 206°C/W for thermal-aware PCB layout. |
Pinout & Package
Package: 8-pin MSOP (3 mm × 3 mm, 0.65 mm pitch), thermally enhanced with exposed pad (VSS-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE | Current-sense input | Voltage drop across external RSENSE sets fast-charge current; 100–120 mV threshold defines IREG. |
| 2: VDD | Supply input | 4.5–12 V input; powers IC and enables UVLO (start: 4.25–4.60 V, stop: 4.20–4.55 V). |
| 3: STAT1 | Status output | Open-drain, current-limited; pulls low during active charge, high-Z when idle or fault (flashing on timer fault). |
| 4: EN | Enable control | Logic-high (>1.4 V) enables charging; logic-low (<0.8 V) forces immediate termination and sleep mode (0.25 µA). |
| 5: TIMER | Safety timer capacitor node | Connects to 0.1 µF capacitor to set precondition (45–75 min), fast-charge (1.1–1.9 hr), and termination (2.2–3.8 hr) periods. |
| 6: VSS | Ground reference | 0 V return for battery negative, sense resistor, and internal circuitry; must connect to exposed pad. |
| 7: VBAT | Battery voltage sense | Direct connection to battery positive; internal precision divider regulates to 4.1 V ±0.5% in CV mode. |
| 8: DRV | MOSFET gate driver | Drives external P-channel MOSFET gate; sinks 2 mA (CV mode), sources -0.5 mA, clamped to -4.5 V (VGS). |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% voltage regulation accuracy | Meets JEITA and IEC 62133 requirements for Li-ion cell safety, eliminating need for post-regulation trimming. |
| Integrated preconditioning stage | Enables safe recovery of cells down to 2.7 V using ~10% IREG trickle current, reducing thermal stress on pass FET. |
| Single-capacitor safety timer scaling | One 0.1 µF capacitor configures all three critical timers (precondition, fast-charge, termination), minimizing BOM count. |
| Open-drain STAT1 with LED drive capability | Directly drives indicator LED without external transistor; supports host MCU polling via pull-up resistor. |
| Automatic power-down on VDD removal | Reduces quiescent current to 0.25 µA when input is absent, preventing battery drain in unpowered systems. |
Applications
| MP3 Player Charging | Cradle Charger |
|---|---|
Use Scenario: Integrated charging in compact, battery-powered audio players with USB or AC adapter input. IC Role / Device Role / Timing Role: Linear charge controller managing CC/CV profile, preconditioning, and status signaling for single-cell Li-ion pack. Use Value: Eliminates need for external microcontroller supervision; 4.1 V regulation matches graphite-anode chemistry for extended cycle life. |
Use Scenario: Dock-style charger that accepts portable device and recharges its battery without user intervention. IC Role / Device Role / Timing Role: Standalone charge manager initiating and terminating charge based on VBAT, EN, and TIMER settings. Use Value: Automatic recharge at VRTH (VREG − 300 mV) ensures full capacity retention between dockings without host coordination. |
| Digital Camera Battery Pack | Hand-Held Instrument |
Use Scenario: Rechargeable battery module inside digital cameras requiring reliable, low-heat charging in tight enclosures. IC Role / Device Role / Timing Role: Primary charge controller regulating current/voltage, detecting end-of-charge, and signaling via STAT1. Use Value: MSOP-8 footprint minimizes PCB area; no thermal sensor reduces component count while maintaining safety compliance. |
Use Scenario: Portable test equipment powered by removable Li-ion battery, charged via wall adapter or USB. IC Role / Device Role / Timing Role: Linear charger providing regulated 4.1 V output, fault indication, and EN-controlled charge initiation. Use Value: UVLO (4.25–4.60 V) prevents charging from weak or unstable supplies; 206°C/W θJA supports passive cooling in sealed housings. |
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 |
|---|---|---|---|
| MCP73831T-410I/OT | 6-pin SOT-23 package; same 4.1 V regulation but fixed 500 mA max current (no RSENSE programming); no TIMER pin - uses internal timers only. | Lacks programmable safety timers and adjustable charge current; suited for ultra-low-cost, fixed-current designs. | Select when board space is extremely constrained and charge current/timer flexibility is unnecessary. |
| BQ24075RGTR | Texas Instruments part in 16-pin QFN; includes integrated 1.2 A FET, USB-compatible input current limit (100/500 mA), and NTC thermistor interface. | Supports temperature monitoring and USB power negotiation - not offered by MCP73843T-410I/MS. | Choose when integrated power FET, USB compliance, or thermal safety are required - at cost of larger footprint and higher complexity. |
Compared with MCP73831T-410I/OT, the MCP73843T-410I/MS offers adjustable charge current and configurable safety timers; versus BQ24075RGTR, it trades integrated FET and USB features for smaller MSOP-8 size and simpler external component count.
Availability
MCP73843T-410I/MS is available at Aetrix Electronics and suitable for MP3 players, cradle chargers, digital cameras, and hand-held instruments requiring stable component supply, long-term manufacturability, and RoHS-compliant linear charging solutions.
Supply support for MCP73843T-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 microcontrollers, analog components, and battery management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP7384X family was designed specifically for cost-sensitive, space-limited single- and dual-cell Li-ion/Li-Po charging applications where high-accuracy voltage regulation, programmable timing, and minimal external components are essential.
FAQ
What is the regulated output voltage of the MCP73843T-410I/MS?
The MCP73843T-410I/MS provides a fixed 4.1 V ±0.5% constant-voltage regulation, optimized for graphite-anode lithium-ion and lithium-polymer cells. This value is factory-trimmed and specified over -40°C to +85°C ambient temperature, ensuring safe and repeatable charge termination without external feedback components.
Does the MCP73843T-410I/MS support battery temperature monitoring?
No, the MCP73843T-410I/MS does not support battery temperature monitoring. It lacks the THREF and THERM pins present in the 10-pin MCP73841/42 variants. The MCP73843T-410I/MS is intended for applications where thermal qualification is handled externally or omitted per system-level safety requirements.
How is the fast-charge current programmed on the MCP73843T-410I/MS?
The fast-charge current is programmed using an external sense resistor (RSENSE) between VDD and the external P-channel MOSFET source. The MCP73843T-410I/MS regulates the voltage drop across RSENSE to 100–120 mV, so IREG = 100 mV / RSENSE. For example, a 200 mΩ resistor sets ~500 mA nominal fast-charge current.
What safety timers are implemented in the MCP73843T-410I/MS?
The MCP73843T-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 scaled by a single external capacitor (CTIMER) connected to the TIMER pin. A 0.1 µF capacitor sets nominal values per datasheet specifications.
What is the function of the STAT1 pin on the MCP73843T-410I/MS?
The STAT1 pin on the MCP73843T-410I/MS is an open-drain, current-limited status output. It pulls low during active charging (precondition, constant-current, constant-voltage), goes high-Z when charging is complete or disabled, and flashes at ~1 Hz during timer faults or qualification failures - enabling direct LED drive or MCU polling.
MCP73843T-410I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MCP73843T-410I/MS FAQ
1.How can I place an order for MCP73843T-410I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73843T-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 MCP73843T-410I/MS reliable?
The price and inventory of MCP73843T-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 MCP73843T-410I/MS is usually 5 days.
3.What payment methods are accepted for MCP73843T-410I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73843T-410I/MS transactions.
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MCP73843T-410I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73843T-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 MCP73843T-410I/MS?
For technical support, including MCP73843T-410I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73843T-410I/MS requirements.
6.How does Aetrix verify that MCP73843T-410I/MS is sourced from the original manufacturer or authorized distributors?
All MCP73843T-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 MCP73843T-410I/MS meets industry standards.
7.What is the process for return or replacement of MCP73843T-410I/MS?
All MCP73843T-410I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP73843T-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 MCP73843T-410I/MS part is unused and in its original packaging.
Return procedure for MCP73843T-410I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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