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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Microchip Technology MCP73861T-I/SL

Name: MCP73861T-I/SL
Brand: Microchip Technology
SKU: MCP73861T-I/SL
Price: 2.40 USD
Availability: InStock
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Part No.:: MCP73861T-I/SL

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: MCP73861T-I/SL.pdf

Description:: IC BATT CNTRL LI-ION 1CEL 16SOIC

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Product details

Overview

MCP73861T-I/SL from Microchip Technology is a fully integrated linear lithium-ion/lithium-polymer battery charge management controller for single-cell applications. It delivers 4.1V or 4.2V constant-voltage regulation (±0.5%), programmable fast-charge current up to 1.2A, preconditioning for deeply depleted cells, automatic end-of-charge detection at ~8% I_REG, and thermal regulation with 155°C shutdown. It is used in space-constrained portable electronics such as MP3 players and cradle chargers.

For engineers reviewing the MCP73861T-I/SL datasheet, MCP73861T-I/SL pinout, MCP73861T-I/SL application, or MCP73861T-I/SL equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, confirmed alternative parts with functional differences, and supply-chain support details specific to the MCP73861T-I/SL variant in SOIC packaging.

Technical Context

The MCP73861T-I/SL implements a three-phase linear charging algorithm: preconditioning (trickle-charge at ~10% of I_REG when V_BAT < V_PTH), constant-current fast charge (I_REG set via PROG resistor), and constant-voltage regulation (V_REG = 4.1V or 4.2V selected by VSET logic level). It integrates reverse-blocking protection, internal current sensing, and UVLO with hysteresis (V_START = 4.5V typ., V_STOP = 4.4V typ.).

Thermal regulation dynamically scales charge current above 60°C to prevent overheating, while die temperature monitoring triggers shutdown at 155°C (10°C hysteresis). Safety timers - fast-charge (1.5 hr typ.), preconditioning (60 min typ.), and elapsed-time termination (3 hr typ.) - are scaled by external capacitor on TIMER pin. Charge status (STAT1) and fault (STAT2) outputs drive LEDs directly via open-drain, current-limited sinks (8 mA typ.).

Key Specifications

Parameter	Value and Actual Design Meaning
Voltage Regulation	4.1V or 4.2V ±0.5% - selectable via VSET pin; supports graphite or coke anodes in Li-ion/Li-Po cells.
Fast Charge Current	Up to 1.2A - set by PROG-to-VSS resistor; enables high-speed charging of 1C-rate single-cell packs.
Input Voltage Range	4.5V to 12V - accommodates USB, wall adapters, and automotive-derived supplies with UVLO protection.
Precondition Threshold	2.80V ±0.1V - initiates safe trickle-charge for cells below safe voltage, preventing damage to deeply discharged batteries.
Charge Termination	~8% of I_REG - precise current-sense-based cutoff ensures full capacity without overcharge.
Operating Temperature	-40°C to +85°C - specified ambient range for industrial and consumer portable equipment operation.
Package	16-pin SOIC - surface-mount package with standard footprint, compatible with automated assembly and reflow.

Pinout & Package

Package: 16-pin SOIC (Small Outline Integrated Circuit), body size 10.3 mm × 7.5 mm, pitch 1.27 mm. Thermal resistance θ_JA = 86.1°C/W on 4-layer board under natural convection.

Pin/Terminal	Circuit Role	Design Meaning
VSET (Pin 1)	Voltage regulation selection input	Connect to VSS for 4.1V output; to VDD for 4.2V output - configures cell chemistry compatibility.
VDD1, VDD2 (Pins 2, 3)	Input supply inputs	Accept 4.5–12V input; internally tied - bypass with ≥4.7 µF ceramic capacitor for stability and noise rejection.
VSS1, VSS2, VSS3 (Pins 4, 13, 15)	Ground reference terminals	Low-impedance return paths for supply, battery sense, and status outputs - must be connected to common system ground.
PROG (Pin 5)	Current regulation programming input	Sets fast-charge (IREG), precondition (IPREG), and termination (ITERM) currents via external resistor to VSS.
THREF (Pin 6)	Thermistor bias reference	2.55V ±0.075V precision reference (200 µA source) for NTC/PTC thermistor divider - enables temperature qualification.
THERM (Pin 7)	Temperature sensor input	Compares thermistor voltage against THREF/2 and THREF/4 thresholds - disables charging outside -10°C to +55°C window.
TIMER (Pin 8)	Safety timer scaling input	External capacitor sets fast-charge (1.5 hr), precondition (60 min), and elapsed-time (3 hr) safety timeouts.
VBAT1, VBAT2 (Pins 10, 11)	Charge control outputs	Drain terminals of internal P-MOSFET pass transistor - connect directly to battery positive terminal.
VBAT3 (Pin 12)	Battery voltage sense input	Precision-resistor-divider feedback node - regulates output to VREG independent of VBAT trace resistance.
EN (Pin 14)	Logic enable input	Active-high control: high = normal operation; low = force charge stop, clear faults, disable auto-recharge.
STAT2 (Pin 15)	Fault status output	Open-drain, 8 mA sink - drives LED or microcontroller; active during fault conditions (thermal, timer, UVLO).
STAT1 (Pin 16)	Charge status output	Open-drain, 8 mA sink - flashes during active charge (MCP73861); turns off at completion (MCP73863).

Key Features

Feature	Design Value
Integrated P-channel MOSFET pass transistor	Eliminates need for external high-side switch and associated gate-drive circuitry - reduces BOM count and PCB area.
Reverse-blocking protection	Prevents battery discharge back into input supply when VDD is removed - critical for USB-powered devices.
Automatic preconditioning	Applies 10% IREG trickle-charge below 2.8V to safely recover deeply depleted Li-ion cells without thermal stress.
Thermal regulation with dynamic timer scaling	Reduces charge current above 60°C and slows safety timers to prevent premature timeout - maintains reliability under thermal load.
Dual status outputs with direct LED drive	STAT1 and STAT2 provide visual charge/fault indication without external drivers - simplifies user-interface design.

Applications

MP3 Players	Cellular Telephones
Use Scenario: Compact portable audio device with removable Li-Po battery requiring safe, autonomous charging from USB or AC adapter. IC Role / Device Role / Timing Role: Primary linear charge controller managing full CC/CV cycle, cell temperature monitoring, and LED status indication. Use Value: Enables single-chip, no-software charging solution with <0.5% voltage accuracy and automatic deep-discharge recovery - extends battery life and field reliability.	Use Scenario: Feature phone with integrated battery and dual-input charging (USB + wall adapter), operating across global temperature ranges. IC Role / Device Role / Timing Role: Standalone charge manager handling input qualification, preconditioning, thermal foldback, and fault signaling. Use Value: Delivers certified Li-ion safety compliance (JEITA-like thermal windows) and 1.2A fast-charge capability in minimal board area.
Digital Cameras	Cradle Chargers
Use Scenario: High-power digital camera with rapid battery turnover, requiring robust overtemperature and overvoltage protection. IC Role / Device Role / Timing Role: Battery-side charge supervisor enforcing JEITA-compliant charge profiles and automatic recharge at VRTH. Use Value: Prevents thermal runaway during burst charging via die-temperature-based current scaling and 155°C shutdown.	Use Scenario: Docking station for handheld instruments that charges battery while device is seated and powered. IC Role / Device Role / Timing Role: Embedded charger IC providing reverse-blocking, automatic power-down when dock removed, and status feedback to host MCU. Use Value: Eliminates external diode and control logic - reduces cradle BOM cost and improves standby current (<4 µA disabled mode).

MP3 Players

Cellular Telephones

Use Scenario: Compact portable audio device with removable Li-Po battery requiring safe, autonomous charging from USB or AC adapter.

IC Role / Device Role / Timing Role: Primary linear charge controller managing full CC/CV cycle, cell temperature monitoring, and LED status indication.

Use Value: Enables single-chip, no-software charging solution with <0.5% voltage accuracy and automatic deep-discharge recovery - extends battery life and field reliability.

Use Scenario: Feature phone with integrated battery and dual-input charging (USB + wall adapter), operating across global temperature ranges.

IC Role / Device Role / Timing Role: Standalone charge manager handling input qualification, preconditioning, thermal foldback, and fault signaling.

Use Value: Delivers certified Li-ion safety compliance (JEITA-like thermal windows) and 1.2A fast-charge capability in minimal board area.

Digital Cameras

Cradle Chargers

Use Scenario: High-power digital camera with rapid battery turnover, requiring robust overtemperature and overvoltage protection.

IC Role / Device Role / Timing Role: Battery-side charge supervisor enforcing JEITA-compliant charge profiles and automatic recharge at VRTH.

Use Value: Prevents thermal runaway during burst charging via die-temperature-based current scaling and 155°C shutdown.

Use Scenario: Docking station for handheld instruments that charges battery while device is seated and powered.

IC Role / Device Role / Timing Role: Embedded charger IC providing reverse-blocking, automatic power-down when dock removed, and status feedback to host MCU.

Use Value: Eliminates external diode and control logic - reduces cradle BOM cost and improves standby current (<4 µA disabled mode).

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
MCP73831T-2ACI/OT	Single-pin QFN-8 package; fixed 4.2V output; max 500 mA charge current; no THERM/THREF pins.	Lacks temperature monitoring and >1A capability - suitable only for low-power, non-temperature-critical applications.	Select when board space is extreme constraint and thermal qualification is not required.
BQ24075RGTR	TI part in 16-pin QFN; 4.2V fixed; 1.5A max; integrated LDO; different STAT logic and timer architecture.	Requires different external component values and firmware handshake for STAT interpretation; no VSET flexibility.	Choose for higher current headroom and integrated LDO, but expect layout and firmware adaptation effort.

Compared with MCP73831T-2ACI/OT, the MCP73861T-I/SL offers 2.4× higher current, full thermal qualification, and VSET-selectable voltage - making it suitable for demanding portable applications. Versus BQ24075RGTR, it provides pin-compatible SOIC packaging and simpler status signaling, but lacks an integrated LDO.

Availability

MCP73861T-I/SL is available at Aetrix Electronics and suitable for MP3 players, cellular telephones, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for MCP73861T-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 Inc. is a leading provider of microcontrollers, analog components, and interface ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP7386X family was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully autonomous, high-accuracy linear charging of single- or dual-cell Li-ion/Li-Po batteries without host processor intervention.

FAQ

What is the maximum fast-charge current supported by the MCP73861T-I/SL?

The MCP73861T-I/SL supports a maximum fast-charge current of 1.2A, achieved when the PROG pin is connected directly to VSS. This value is typical at +25°C and decreases under thermal regulation above 60°C. The actual current is programmable down to 100 mA using an external resistor, and the MCP73861T-I/SL datasheet provides the exact R_PROG calculation formula based on desired I_REG.

How does the MCP73861T-I/SL handle deeply discharged batteries?

The MCP73861T-I/SL automatically enters preconditioning mode when V_BAT falls below 2.80V ±0.1V. In this mode, it applies a reduced "trickle-charge" current (~10% of the programmed I_REG) to safely restore voltage before initiating full-rate charging. This prevents lithium plating and thermal stress in severely depleted Li-ion cells - a key safety feature confirmed in the MCP73861T-I/SL functional block diagram and Section 4.1.

Can the MCP73861T-I/SL be used with dual-cell (8.4V) battery packs?

No, the MCP73861T-I/SL is specifically designed for single-cell Li-ion/Li-Po applications and supports only 4.1V or 4.2V regulation. Dual-cell compatibility requires the MCP73862/4 variants, which offer 8.2V/8.4V options and higher input voltage range (8.7–12V). Using MCP73861T-I/SL with an 8.4V pack would result in undercharging and failure to reach full capacity - a distinction explicitly defined in the MCP73861/2/3/4 datasheet Section 1.0 and Device Overview.

What is the function of the VSET pin on the MCP73861T-I/SL?

The VSET pin on the MCP73861T-I/SL selects the regulated output voltage: tying VSET to VSS configures 4.1V regulation, while tying it to VDD selects 4.2V. This allows one hardware design to support both graphite- and coke-anode Li-ion cells. The MCP73861T-I/SL's VSET logic is electrically validated in DC Characteristics tables (DS21893F-page 4), where VREG min/typ/max values are explicitly split by VSET state.

Does the MCP73861T-I/SL include thermal shutdown protection?

Yes, the MCP73861T-I/SL includes dedicated thermal shutdown protection that suspends charging when the die temperature exceeds 155°C, with 10°C hysteresis. This is a secondary safety layer independent of thermal regulation. The shutdown threshold and hysteresis are guaranteed across the full -40°C to +85°C ambient range and are documented in the Temperature Specifications table (DS21893F-page 6) - confirming fail-safe behavior under sustained overload or poor heatsinking.

MCP73861T-I/SL Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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

MCP73861T-I/SL FAQ

1.How can I place an order for MCP73861T-I/SL through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73861T-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 MCP73861T-I/SL reliable?

The price and inventory of MCP73861T-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 MCP73861T-I/SL is usually 5 days.

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Once your MCP73861T-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 MCP73861T-I/SL?

For technical support, including MCP73861T-I/SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73861T-I/SL requirements.

6.How does Aetrix verify that MCP73861T-I/SL is sourced from the original manufacturer or authorized distributors?

All MCP73861T-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 MCP73861T-I/SL meets industry standards.

7.What is the process for return or replacement of MCP73861T-I/SL?

All MCP73861T-I/SL units undergo pre-shipment inspection (PSI). If there is an issue with MCP73861T-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 MCP73861T-I/SL part is unused and in its original packaging.

Return procedure for MCP73861T-I/SL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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