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Microchip Technology MCP73871-2CAI/ML
- Part No.:
- MCP73871-2CAI/ML
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MCP73871-2CAI/ML.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:433
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Product details
Overview
MCP73871-2CAI/ML from Microchip Technology is a fully integrated linear Li-Ion/Li-Polymer battery charge management IC with system load sharing, supporting simultaneous system power delivery and battery charging from USB or AC-DC sources. It delivers up to 1.8A total input current, provides ±0.5% voltage regulation at 4.20V, features resistor-programmable fast charge current (50 mA to 1A), and operates across –40°C to +85°C in portable medical devices and Bluetooth headsets.
For engineers reviewing the MCP73871-2CAI/ML datasheet, MCP73871-2CAI/ML pinout, MCP73871-2CAI/ML application, or MCP73871-2CAI/ML equivalent, key selection criteria include its dual-source input selection (SEL pin), VPCC-based input voltage proportional charge control, thermal regulation with 150°C shutdown, LBO threshold of 3.1V ('C' suffix), and 4-hour safety timer ('2' suffix).
Technical Context
The MCP73871-2CAI/ML implements a constant-current/constant-voltage (CC/CV) charge algorithm with four factory-set regulation voltages (4.10V/4.20V/4.35V/4.40V); the '2C' variant selects 4.20V ±0.5% and 4-hour safety timer. Its Voltage Proportional Current Control (VPCC) dynamically reduces charge current when input voltage drops below 1.23V at the VPCC pin, preserving system load priority.
It integrates dual pass transistors (IN→OUT and VBAT→OUT) with 200 mΩ RDS(on), ideal diode operation, reverse discharge protection, and thermistor monitoring via 50 μA bias on THERM. The device autonomously selects between battery and input source based on voltage comparison and UVLO hysteresis (90 mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±0.5% - precisely regulates single-cell Li-Ion battery termination voltage per JEITA standard |
| Max Input Current | 1.8A total - shared between system load and battery charge, enabling high-power portable designs |
| Fast Charge Current | 50 mA to 1A - set by PROG1 resistor; enables flexible battery capacity matching (e.g., 100–2000 mAh) |
| Safety Timer | 4 hours - prevents overcharge during abnormal conditions; enabled by TE pin low, disabled by CE toggle |
| LBO Threshold | 3.1V - signals low battery state when VBAT falls below this level while system runs on battery |
| Thermal Shutdown | 150°C - suspends charging to protect IC and battery; resumes after 10°C hysteresis |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade portable equipment including medical and GPS devices |
Pinout & Package
Package: 20-Lead QFN (4 mm × 4 mm) with exposed thermal pad (EP) electrically connected to VSS; requires PCB thermal pad connection for thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 (OUT) | System output terminal | Delivers regulated power to system load; maintains operation even with deeply depleted or absent battery |
| 2 (VPCC) | Voltage proportional charge control input | Enables dynamic charge current reduction when input voltage sags; 1.23V threshold ensures USB/adapter compliance |
| 3 (SEL) | Input source selection | High = AC-DC adapter mode (1.8A max input); Low = USB mode (100/500 mA selectable) |
| 4 (PROG2) | USB current limit select | Digital input: Low = 100 mA, High = 500 mA - enforces USB 2.0 unit-load compliance |
| 5 (THERM) | Thermistor monitor I/O | 50 μA bias current for NTC thermistor; compares to 1.24V/0.25V thresholds for temperature fault detection |
| 6 (PG) | Power Good status output | Open-drain indicator active-low when VIN > UVLO and VIN > VBAT - signals valid input supply presence |
| 7 (STAT2) | Charge status output 2 | Open-drain; LOW during charge complete, Hi-Z otherwise - used with STAT1 for multi-state LED indication |
| 8 (STAT1/LBO) | Charge status / Low Battery Output | Open-drain; LOW during charging or LBO condition (VBAT < 3.1V while running on battery) |
| 9 (TE) | Timer Enable input | Active-low enables 4-hour safety timer; floating or high disables timer - supports adaptive charge duration |
| 10, 11, EP (VSS) | Battery management ground | Common reference for battery, system, and input; EP must be soldered to PCB ground plane for thermal reliability |
| 12 (PROG3) | Termination set point | Resistor-to-VSS sets end-of-charge current ratio (7.5–12.5% of IREG) - determines CC-to-CV transition point |
| 13 (PROG1) | Fast charge current set | Resistor-to-VSS programs IREG (50–1000 mA); also sets preconditioning current (10% of IREG) |
| 14, 15 (VBAT) | Battery positive connection | Connects to Li-Ion anode; bypassed with ≥4.7 μF capacitor for stability during charge/discharge transients |
| 16 (VBAT_SENSE) | Battery voltage sense | High-impedance feedback node for precision VREG regulation; decoupled internally to avoid noise coupling |
| 17 (CE) | Charge Enable input | Active-high enables charging; LOW disables all charge functions while preserving system power via OUT |
| 18, 19 (IN) | Power supply input | Accepts 4.3V–6V from USB or AC-DC; requires ≥4.7 μF input capacitance for ripple suppression |
Key Features
| Feature | Design Value |
|---|---|
| Integrated system load sharing | Ensures system powers up even with 0V battery by prioritizing OUT over VBAT charging path |
| Voltage Proportional Current Control (VPCC) | Automatically scales charge current downward when input voltage sags - preserves system operation under weak sources |
| Resistor-programmable charge parameters | Single external resistor (PROG1) sets both fast charge current and preconditioning level - simplifies BOM and layout |
| Thermal regulation with shutdown | Reduces charge current above 125°C and halts charging at 150°C - prevents thermal runaway in sealed enclosures |
| Low battery indicator (LBO) | 3.1V threshold with 150 mV hysteresis - provides early warning before system brownout in battery-only mode |
| USB-compliant current limiting | Hardware-selectable 100/500 mA USB port current limits - eliminates need for external current-sense circuitry |
Applications
| GPS Navigation Devices | Bluetooth Headsets |
|---|---|
Use Scenario: Portable handheld GPS units requiring continuous operation during vehicle charging and battery backup during outdoor use. IC Role / Device Role / Timing Role: Dual-role power manager: supplies system from USB/12V adapter while concurrently charging Li-Polymer battery; manages seamless switchover during disconnection. Use Value: Eliminates system shutdown during battery replacement; extends runtime via VPCC-based adaptive charging under marginal input conditions. | Use Scenario: Compact wireless audio accessories with tight space constraints and strict USB power compliance. IC Role / Device Role / Timing Role: USB-native charger with automatic 100 mA/500 mA selection and integrated LBO alert - enables host-controlled battery health reporting. Use Value: Reduces bill-of-materials by integrating reverse discharge protection, thermistor interface, and dual-status LEDs in 4×4 mm QFN. |
| Portable Medical Monitors | Smartphone Docking Stations |
Use Scenario: FDA-classified wearable ECG or glucose monitors needing reliable charge termination and temperature-safe operation. IC Role / Device Role / Timing Role: Safety-critical battery manager: enforces JEITA-compliant 4.20V regulation, 150°C thermal cutoff, and 4-hour charge timer - meets IEC 62368-1 requirements. Use Value: Guarantees no overvoltage or overtemperature exposure to medical-grade Li-Ion cells - critical for patient safety certification. | Use Scenario: Multi-device cradles that simultaneously charge smartphones and power auxiliary peripherals (e.g., USB hubs, displays). IC Role / Device Role / Timing Role: High-current system load sharer: delivers up to 1.8A combined to phone battery and dock electronics - avoids external DC-DC conversion losses. Use Value: Enables single-input (AC adapter) powering of entire dock ecosystem without derating or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-Ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2V regulation, no VPCC, 1.5A max input, no LBO output | Lacks system load sharing priority and battery temperature monitoring - unsuitable for thermally constrained or dual-source designs | Select when cost sensitivity outweighs adaptive charging and safety feature requirements |
| MAX1555ESA+ | Fixed 4.2V, 500 mA max charge current, no programmable termination, no thermal shutdown | No thermal protection or safety timer - requires external supervision for medical or industrial use | Choose only for ultra-low-cost, low-power (<500 mAh) consumer accessories with ambient thermal control |
Compared with BQ24075RGTR and MAX1555ESA+, the MCP73871-2CAI/ML uniquely combines VPCC-based input adaptation, integrated thermistor interface, 3.1V LBO, and 4-hour safety timer in a single 20-pin QFN - making it optimal for compact, safety-aware portable systems requiring autonomous dual-source operation.
Availability
MCP73871-2CAI/ML is available at Aetrix Electronics and suitable for GPS navigation devices, portable medical monitors, and Bluetooth headsets requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MCP73871-2CAI/ML 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 leading provider of microcontrollers, analog components, and battery management ICs, serving industrial, automotive, and consumer markets with high-reliability silicon solutions.
The MCP73871 product line delivers fully integrated linear charge controllers with system load sharing for space-constrained portable electronics - designed specifically for USB/AC-DC dual-source battery-powered devices demanding safety, autonomy, and minimal external components.
FAQ
What is the exact charge voltage regulation accuracy of the MCP73871-2CAI/ML?
The MCP73871-2CAI/ML provides ±0.5% regulation tolerance at its factory-configured 4.20V constant-voltage setpoint, measured at +25°C with 10 mA load. Over the full operating temperature range (–5°C to +55°C), regulation remains within ±0.75%. This accuracy ensures compliant charging of standard single-cell Li-Ion batteries without external calibration.
How does the MCP73871-2CAI/ML handle input source switching between USB and AC-DC adapter?
The MCP73871-2CAI/ML uses the SEL pin to configure input behavior: when SEL is high, it enables AC-DC mode with up to 1.8A total input current; when SEL is low, it enters USB mode with programmable 100/500 mA limits via PROG2. The device autonomously routes power to OUT while charging VBAT, with UVLO hysteresis ensuring glitch-free transitions during source insertion/removal.
What does the '2C' in MCP73871-2CAI/ML indicate?
The '2' denotes a 4-hour safety timer interval, and the 'C' specifies a 3.1V low-battery output (LBO) threshold. These are factory-programmed options encoded in the part number - the MCP73871-2CAI/ML is not user-configurable for timer duration or LBO voltage; alternative variants (e.g., '3D') offer different combinations.
Can the MCP73871-2CAI/ML charge a battery while the system is powered off?
Yes - the MCP73871-2CAI/ML continues charging the battery whenever a valid input source (VIN > UVLO threshold and VIN > VBAT) is present, regardless of system load state. The OUT pin may be unconnected or loaded, but charging proceeds autonomously as long as CE is high and no fault (thermal, timer, or voltage) is asserted.
What thermal management features does the MCP73871-2CAI/ML provide?
The MCP73871-2CAI/ML incorporates junction-temperature-based thermal regulation: it reduces charge current above 125°C and triggers full thermal shutdown at 150°C with 10°C hysteresis. Its 20-lead QFN package includes an exposed thermal pad (EP) tied to VSS, enabling θJA = 50°C/W on a 4-layer board - critical for sustained 1.8A operation in enclosed portable housings.
MCP73871-2CAI/ML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 1.1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
MCP73871-2CAI/ML FAQ
1.How can I place an order for MCP73871-2CAI/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73871-2CAI/ML 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 MCP73871-2CAI/ML reliable?
The price and inventory of MCP73871-2CAI/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73871-2CAI/ML is usually 5 days.
3.What payment methods are accepted for MCP73871-2CAI/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73871-2CAI/ML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73871-2CAI/ML?
MCP73871-2CAI/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73871-2CAI/ML 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 MCP73871-2CAI/ML?
For technical support, including MCP73871-2CAI/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73871-2CAI/ML requirements.
6.How does Aetrix verify that MCP73871-2CAI/ML is sourced from the original manufacturer or authorized distributors?
All MCP73871-2CAI/ML 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 MCP73871-2CAI/ML meets industry standards.
7.What is the process for return or replacement of MCP73871-2CAI/ML?
All MCP73871-2CAI/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73871-2CAI/ML, 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 MCP73871-2CAI/ML part is unused and in its original packaging.
Return procedure for MCP73871-2CAI/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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