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Microchip Technology MCP73861-I/SL
- Part No.:
- MCP73861-I/SL
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MCP73861-I/SL.pdf
- Description:
- IC BATT CNTRL LI-ION 1CEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
MCP73861-I/SL from Microchip Technology is a fully integrated linear lithium-ion/lithium-polymer battery charge management controller for single-cell applications. It features 4.1V/4.2V selectable voltage regulation, programmable 1.2A max fast-charge current via PROG pin, integrated pass transistor and current sense, reverse-blocking protection, and thermal regulation. It is used in space-constrained portable devices such as cellular telephones and digital cameras.
For engineers reviewing the MCP73861-I/SL datasheet, MCP73861-I/SL pinout, MCP73861-I/SL application, or MCP73861-I/SL equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Microchip's DS21893F specification.
Technical Context
The MCP73861-I/SL implements a three-phase linear charging algorithm: preconditioning (trickle-charge at ≤15 mA for deeply depleted cells), constant-current fast charge (up to 1.2 A), and constant-voltage regulation (±0.5% accuracy at 4.1V or 4.2V). It integrates UVLO (4.25–4.65 V start), thermal shutdown (155°C), and dual temperature comparators referenced to THREF (2.55 V typical).
Charge termination is determined by either current drop below 8.5 mA (at PROG = OPEN) or elapsed safety timers (60 min precondition, 1.5 hr fast-charge, 3 hr total). Status outputs STAT1 (flashing on completion) and STAT2 (fault indication) support direct LED drive with 8 mA sink capability and 200 mV VOL at 1 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.1V or 4.2V ±0.5%; selected by VSET pin tied to VSS or VDD - enables compatibility with coke/graphite anodes. |
| Max Fast-Charge Current | 1.2 A (PROG = VSS); scaled linearly via external resistor - supports high-power portable Li-ion packs. |
| Precondition Threshold | 2.70–2.90 V (VSET = VSS); initiates safe trickle-charge for cells below safe voltage - prevents lithium plating. |
| Charge Termination Current | 6–11 mA (PROG = OPEN); triggers end-of-charge when current drops to ~8% of IREG - ensures full saturation without overcharge. |
| Operating Temp Range | −40°C to +85°C ambient; die thermal shutdown at 155°C with 10°C hysteresis - enables reliable operation in consumer handhelds. |
| Supply Voltage Range | 4.5 V to 12 V; UVLO start at 4.5 V - compatible with 5 V USB adapters and higher-input wall adapters. |
| Package Thermal Resistance | θJA = 47°C/W (QFN); enables sustained 1.2 A charging without external heatsink in compact layouts. |
Pinout & Package
Package: 16-pin SOIC (MCP73861-I/SL) and 4×4 mm QFN (MCP73861-E/SL); both share identical pin mapping per DS21893F-page 13.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSET | Voltage regulation selection input | Connect to VSS for 4.1V or VDD for 4.2V output - configures chemistry-specific termination voltage. |
| PROG | Current regulation set input | Resistor-to-VSS sets fast-charge (IREG), precondition (IPREG), and termination (ITERM) currents proportionally. |
| THERM / THREF | Temperature sensing interface | THREF supplies 2.55 V reference; THERM compares against VTHREF/2 and VTHREF/4 - enables NTC/PTC thermistor monitoring. |
| STAT1 / STAT2 | Open-drain status outputs | STAT1 flashes on charge completion (MCP73861); STAT2 sinks 8 mA for fault LED - no external driver needed. |
| VBAT1/VBAT2/VBAT3 | Battery charge control and sense | VBAT1/VBAT2 are internal P-MOSFET drains; VBAT3 is precision-sense input - separates power path from feedback loop. |
| EN | Logic enable input | Active-high; forces charge start/stop or clears faults - allows host MCU control of charging state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET pass transistor | Eliminates external high-side switch; reduces BOM count and PCB area in single-cell charger designs. |
| Reverse-blocking protection | Prevents battery discharge back into input supply when VDD is removed - critical for USB-powered devices. |
| Programmable safety timers | Independent 60-min precondition, 1.5-hr fast-charge, and 3-hr elapsed timers - prevents thermal runaway during fault conditions. |
| Automatic power-down mode | Enters <4 µA standby when VDD falls below UVLO stop threshold - preserves battery energy when adapter is unplugged. |
| Thermal regulation with timer scaling | Reduces charge current above ~85°C and slows safety timers - avoids premature timeout during thermal limiting. |
Applications
| Cellular Telephones | Digital Cameras |
|---|---|
Use Scenario: Charging a 3.7 V Li-ion pack from 5 V USB input in a slim smartphone form factor. IC Role / Device Role / Timing Role: Linear charge controller managing precondition, CC/CV stages, and thermal foldback. Use Value: Enables compact, low-noise charging with ±0.5% voltage accuracy and direct LED status - no external op-amps or FET drivers required. |
Use Scenario: Recharging removable Li-ion battery in DSLR or mirrorless camera using AC adapter. IC Role / Device Role / Timing Role: Standalone charger IC handling deep-discharge recovery, temperature-monitored CV phase, and fault-safe termination. Use Value: Supports 1.2 A fast charge while monitoring cell temp via NTC thermistor - prevents swelling or failure during rapid recharge cycles. |
| MP3 Players | Hand-Held Instruments |
Use Scenario: Integrated charging in portable audio player with battery fuel gauge and USB connectivity. IC Role / Device Role / Timing Role: Charge manager providing STAT1/STAT2 signals to MCU for UI feedback and battery health reporting. Use Value: Delivers precise 4.2 V regulation and automatic recharge at VRTH = VREG −200 mV - extends usable runtime between charges. |
Use Scenario: Field-deployable test equipment requiring robust, maintenance-free battery charging under variable ambient temperatures. IC Role / Device Role / Timing Role: Primary charge controller with wide −40°C to +85°C operation and thermal comparator hysteresis. Use Value: Maintains safe charging across industrial temperature range using THREF-referenced thermistor bias - eliminates need for external ADC or compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24040DRCT | Fixed 4.2 V only; no VSET option; 1 A max charge current; integrated LDO for system power. | Lacks dual-voltage selection and 1.2 A capability; better suited for cost-sensitive, fixed-chemistry designs. | Select BQ24040DRCT if 4.2 V-only regulation and lower current suffice, and system power rail integration is desired. |
| TP4056 | Fixed 4.2 V; no temperature monitoring; no preconditioning; 1 A max; no EN or STAT2 pins. | Minimal feature set - suitable only for basic USB-powered chargers without safety or telemetry requirements. | Choose TP4056 only for ultra-low-cost, non-temperature-critical consumer gadgets where full safety compliance is not mandated. |
Compared with BQ24040DRCT and TP4056, the MCP73861-I/SL provides unique flexibility in voltage selection (4.1V/4.2V), higher 1.2 A current, integrated thermistor interface, and dual-status signaling - making it optimal for certified, field-reliable portable electronics.
Availability
MCP73861-I/SL is available at Aetrix Electronics and suitable for cellular telephones, digital cameras, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MCP73861-I/SL 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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and interface solutions with broad industrial and automotive qualification.
The MCP7386X product line was designed specifically for cost-sensitive, space-limited Li-ion/Li-Po charging in portable consumer electronics - emphasizing integration, safety compliance, and minimal external components.
FAQ
What is the function of the VSET pin on the MCP73861-I/SL?
The VSET pin on the MCP73861-I/SL selects the regulated battery voltage: tying VSET to VSS configures 4.1 V output for coke-anode cells, while tying it to VDD selects 4.2 V for graphite-anode cells. This dual-option design ensures compatibility with different Li-ion chemistries without changing the IC - a key requirement in multi-platform portable device development.
How does the MCP73861-I/SL handle deeply discharged batteries?
The MCP73861-I/SL initiates preconditioning when VBAT falls below 2.70–2.90 V (VSET = VSS), delivering a controlled 5–15 mA trickle charge via the PROG pin setting. This safely restores voltage before fast charging begins - preventing lithium metal plating and extending cycle life. The precondition timer (45–75 min) enforces strict safety limits.
Can the MCP73861-I/SL be used with dual-cell (8.4 V) battery packs?
No - the MCP73861-I/SL is strictly for single-cell Li-ion/Li-Po applications (4.1 V or 4.2 V). Dual-cell support requires the MCP73862/4 variants, which offer 8.2 V/8.4 V regulation and higher input voltage range (8.7–12 V). Using MCP73861-I/SL on 8.4 V packs will result in undercharging and potential safety violations.
What is the maximum continuous charge current supported by the MCP73861-I/SL?
The MCP73861-I/SL supports up to 1.2 A continuous fast-charge current when the PROG pin is tied directly to VSS. This value is confirmed in DS21893F-page 5 (IREG = 1020–1380 mA typ/max). Higher currents require thermal derating per θJA = 47°C/W, and layout must include adequate copper area on the exposed pad (EP) tied to VSS.
Does the MCP73861-I/SL provide battery temperature monitoring?
Yes - the MCP73861-I/SL includes dedicated THREF (2.55 V reference) and THERM pins to interface with an external NTC or PTC thermistor. Internal comparators monitor upper (1.25 V) and lower (0.62 V) thresholds relative to THREF, enabling continuous temperature qualification before and during charging - a mandatory feature for UL/IEC 62368-1 compliance.
MCP73861-I/SL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- 1.38A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MCP73861-I/SL FAQ
1.How can I place an order for MCP73861-I/SL through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73861-I/SL 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 MCP73861-I/SL reliable?
The price and inventory of MCP73861-I/SL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73861-I/SL is usually 5 days.
3.What payment methods are accepted for MCP73861-I/SL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73861-I/SL transactions.
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MCP73861-I/SL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73861-I/SL 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 MCP73861-I/SL?
For technical support, including MCP73861-I/SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73861-I/SL requirements.
6.How does Aetrix verify that MCP73861-I/SL is sourced from the original manufacturer or authorized distributors?
All MCP73861-I/SL 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 MCP73861-I/SL meets industry standards.
7.What is the process for return or replacement of MCP73861-I/SL?
All MCP73861-I/SL units undergo pre-shipment inspection (PSI). If there is an issue with MCP73861-I/SL, 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 MCP73861-I/SL part is unused and in its original packaging.
Return procedure for MCP73861-I/SL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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