MCP73861-I/SL Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP73861-I/SL is a linear lithium-ion and lithium-polymer battery charger IC supporting up to 1 A charge current with integrated preconditioning and end-of-charge detection in a 16-pin SOIC package. Provides charge status outputs, thermal regulation, and safety timer in a fully integrated solution requiring minimal external components. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- MCP73861-I/SL Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Linear Li-Ion/Li-Po charger with up to 1 A programmable charge current via external resistor for single-cell battery packs
- Integrated preconditioning, constant-current/constant-voltage charge algorithm, and automatic end-of-charge termination
- Charge status indicator outputs with thermal regulation and safety timer in a 16-pin SOIC for compact charger designs
Applications
The MCP73861-I/SL is designed for portable consumer electronics chargers, handheld medical instruments, and GPS trackers where a complete single-cell lithium-ion or lithium-polymer charge management solution must fit in minimal PCB area with few external parts. IoT devices powered by 3.7 V Li-Po cells benefit from its automatic preconditioning that safely recovers deeply discharged batteries before transitioning to the standard CC/CV profile. It is also used in USB-powered charging docks and wall adapters where its thermal regulation feature limits charge current when the IC junction temperature approaches a safe limit.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | LINEAR BATTERY CHARGER |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 4mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP73861-I/SL:
Frequently Asked Questions
What maximum charge current does the MCP73861-I/SL support and how is it set?
The MCP73861-I/SL supports a programmable maximum charge current of up to 1 A, set by a single external resistor connected to the PROG pin. This allows designers to tailor the charge rate to the capacity of their specific Li-Ion or Li-Po cell — for example, a 1000 mAh cell is typically charged at C/1 = 1 A, while a 500 mAh cell uses 500 mA to stay within safe charge rate limits.
How does the MCP73861-I/SL handle deeply discharged lithium-ion cells during preconditioning?
When the cell voltage is below approximately 3.0 V, the MCP73861-I/SL enters a preconditioning phase applying a reduced current of about 10% of the full programmed charge current. This gently recovers the cell from deep discharge without triggering protection circuits, after which the IC automatically transitions to the standard constant-current phase at the full programmed rate, protecting the battery from damage during recovery.
What safety features does the MCP73861-I/SL include to protect the battery and system during charging?
The MCP73861-I/SL integrates a programmable safety timer that terminates charging if the battery does not reach full charge within a set period (typically 4 hours at 1 A), a thermal regulation loop that reduces charge current when the IC junction exceeds a safe temperature threshold, and dedicated STAT1 and STAT2 status output pins that signal charge-in-progress, charge-complete, or fault conditions to a host MCU.
How compact is the MCP73861-I/SL solution and how does it compare to a discrete charger circuit?
The MCP73861-I/SL integrates the entire CC/CV charge algorithm, preconditioning, termination, status outputs, and thermal protection in a 16-pin SOIC package roughly 9.9 mm × 3.9 mm, requiring only a programming resistor, a few bypass capacitors, and an optional NTC thermistor. A comparable discrete implementation using a PWM controller, pass FET, current-sense resistor, and protection comparators would occupy 3-4 times more PCB area and require careful compensation design.
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