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

Microchip Technology MCP73871T-1AAI/ML

Name: MCP73871T-1AAI/ML
Brand: Microchip Technology
SKU: MCP73871T-1AAI/ML
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73871T-1AAI/ML

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 20-VFQFN Exposed Pad

Datasheet:: MCP73871T-1AAI/ML.pdf

Description:: IC BATT CHG LI-ION 1CELL 20QFN

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Product details

Overview

MCP73871T-1AAI/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, ±0.5% voltage regulation at 4.20V, resistor-programmable fast charge current (50 mA to 1A), and operates across –40°C to +85°C in portable medical devices and GPS navigators.

For engineers reviewing the MCP73871T-1AAI/ML datasheet, MCP73871T-1AAI/ML pinout, MCP73871T-1AAI/ML application, or MCP73871T-1AAI/ML equivalent, key selection criteria include VPCC-based input priority control, thermal regulation during high-power charging, selectable 4.20V charge voltage with 0.1C preconditioning, and open-drain status outputs (STAT1/LBO, STAT2, PG) for host MCU interfacing or LED indication.

Technical Context

The MCP73871T-1AAI/ML implements a constant-current/constant-voltage (CC/CV) charge algorithm with autonomous power source arbitration between input (IN) and battery (VBAT), using ideal diode operation for low-loss power-path management. Its Voltage Proportional Current Control (VPCC) circuit dynamically reduces charge current when input voltage drops below 1.23V threshold, preserving system load priority.

It integrates dual pass transistors (IN→OUT and VBAT→OUT), reverse discharge protection, and a 50 μA thermistor bias current for NTC-based temperature monitoring. The device features a factory-set 4.20V charge voltage option ('1' in part number), LBO threshold of 3.0V ('A'), and 4-hour safety timer ('A'), all confirmed by its suffix 'T-1AAI/ML' per Microchip's Product Identification System.

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 standards.
Max Input Current	1.8A total - shared between system load and battery charge, enabling high-power portable designs without external current limiting.
Fast Charge Current	50 mA to 1A - resistor-programmable via PROG1, allowing flexible adaptation to battery capacity and thermal constraints.
Thermal Regulation	Active die-temperature limiting - reduces charge current above 150°C junction temperature to prevent thermal runaway.
Operating Temp	–40°C to +85°C ambient - fully specified for industrial-grade portable equipment including medical and navigation devices.
LBO Threshold	3.0V - triggers low-battery alert on STAT1 when VBAT falls below this level while system runs from battery.
Safety Timer	4 hours - configurable via TE pin; prevents indefinite charging under fault conditions, enhancing reliability.

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 and electrical reference integrity.

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	Accepts ≥1.23V reference to enable dynamic charge current reduction when input supply sags, ensuring system load priority.
3 (SEL)	Input Source Selection	High = AC-DC adapter mode (1.8A max input); Low = USB mode (100/500 mA programmable).
4 (PROG2)	USB Input Current Select	Digital input: Low = 100 mA, High = 500 mA USB current limit - enforces USB specification compliance.
5 (THERM)	Thermistor Monitoring I/O	Supplies 50 μA bias current to NTC thermistor; compares voltage against 1.24V/0.25V thresholds for over/under-temperature shutdown.
6 (PG)	Power Good Output	Open-drain indicator active-low when IN > UVLO and IN > VBAT - signals valid input power presence to host MCU or LED.
7 (STAT2)	Charge Status Output 2	Open-drain output indicating charge cycle state (e.g., active charging, complete, fault) - used with pull-up for MCU polling or LED drive.
8 (STAT1/LBO)	Charge Status / Low Battery Output	Dual-function open-drain pin: LOW during charging; LOW again when VBAT < 3.0V during battery-only operation.
9 (TE)	Timer Enable Input	Active-low enables 4-hour safety timer; floating or high disables timer - allows host-controlled charge duration management.
10, 11, EP (VSS)	Battery Management Ground	Primary 0V reference for all analog blocks; EP must be soldered to PCB ground plane for thermal dissipation and noise immunity.
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 precision.
13 (PROG1)	Fast Charge Current Set	Resistor-to-VSS programs maximum CC current (50 mA–1A); also sets preconditioning current (10% of IREG).
14, 15 (VBAT)	Battery Positive Connection	Main battery terminal; supports reverse discharge protection and internal voltage sensing via VBAT_SENSE.
16 (VBAT_SENSE)	Battery Voltage Sense	High-impedance input for precision VBAT feedback; internal 0.001× gain ensures accurate regulation independent of trace resistance.
17 (CE)	Charge Enable Input	Active-high enables charging; low disables all charge functions while maintaining system power path - enables host-controlled charge sequencing.
18, 19 (IN)	Power Supply Input	Accepts 4.3V–6V from USB or AC-DC source; bypassed with ≥4.7 μF capacitor to suppress ripple and ensure stability.

Key Features

Feature	Design Value
Voltage Proportional Current Control (VPCC)	Ensures system load receives priority over battery charging by reducing charge current when input voltage sags - critical for stable operation under weak USB sources.
Integrated Power-Path Management	Eliminates need for external MOSFETs or diodes by combining IN→OUT and VBAT→OUT ideal diode paths with <200 mΩ R_DS(on) - reduces BOM count and PCB area.
Resistor-Programmable Charge Parameters	PROG1, PROG2, PROG3 allow full customization of fast charge current, USB current limit, and termination threshold without firmware or external DACs.
Factory-Set 4.20V Charge Voltage	'1' in part number confirms ±0.5% 4.20V regulation - matches standard Li-Ion chemistry and eliminates external voltage-setting components.
Thermal & Safety Monitoring	On-die temperature sensing (150°C shutdown), NTC thermistor interface, UVLO, and 4-hour safety timer provide five-layer protection for battery and system reliability.

Applications

GPS Navigation Devices	Portable Medical Monitors
Use Scenario: Handheld GPS units requiring continuous operation during charging via car adapter or USB. IC Role / Device Role / Timing Role: Dual-role power manager: supplies system load from IN or VBAT while autonomously charging Li-Ion battery with CC/CV profile. Use Value: Enables hot-swap battery operation and uninterrupted GPS tracking - no system reboot or data loss during charge transitions.	Use Scenario: Battery-powered blood glucose meters or pulse oximeters needing safe, certified charging in clinical environments. IC Role / Device Role / Timing Role: Safety-critical battery charger with NTC temperature monitoring, 4-hour safety timer, and ±0.5% voltage accuracy for regulatory compliance. Use Value: Meets IEC 62368-1 requirements for battery management; LBO (3.0V) alerts users before critical power loss during patient monitoring.
Smartphone Docking Stations	Bluetooth Headsets
Use Scenario: Multi-device cradles that charge smartphones while powering auxiliary displays or audio interfaces. IC Role / Device Role / Timing Role: Load-sharing controller managing up to 1.8A total current between host system and attached smartphone battery. Use Value: Eliminates need for separate buck converters or discrete OR-ing FETs - reduces solution size and improves efficiency over discrete implementations.	Use Scenario: Compact wireless headsets with micro-USB charging and tight thermal constraints. IC Role / Device Role / Timing Role: Ultra-small-footprint linear charger with 4.20V regulation, 0.1C preconditioning, and thermal foldback to prevent overheating in sealed enclosures. Use Value: Enables full-featured charging in <30 mm² PCB area; VPCC prevents audio dropouts during USB cable flex-induced input sag.

GPS Navigation Devices

Portable Medical Monitors

Use Scenario: Handheld GPS units requiring continuous operation during charging via car adapter or USB.

IC Role / Device Role / Timing Role: Dual-role power manager: supplies system load from IN or VBAT while autonomously charging Li-Ion battery with CC/CV profile.

Use Value: Enables hot-swap battery operation and uninterrupted GPS tracking - no system reboot or data loss during charge transitions.

Use Scenario: Battery-powered blood glucose meters or pulse oximeters needing safe, certified charging in clinical environments.

IC Role / Device Role / Timing Role: Safety-critical battery charger with NTC temperature monitoring, 4-hour safety timer, and ±0.5% voltage accuracy for regulatory compliance.

Use Value: Meets IEC 62368-1 requirements for battery management; LBO (3.0V) alerts users before critical power loss during patient monitoring.

Smartphone Docking Stations

Bluetooth Headsets

Use Scenario: Multi-device cradles that charge smartphones while powering auxiliary displays or audio interfaces.

IC Role / Device Role / Timing Role: Load-sharing controller managing up to 1.8A total current between host system and attached smartphone battery.

Use Value: Eliminates need for separate buck converters or discrete OR-ing FETs - reduces solution size and improves efficiency over discrete implementations.

Use Scenario: Compact wireless headsets with micro-USB charging and tight thermal constraints.

IC Role / Device Role / Timing Role: Ultra-small-footprint linear charger with 4.20V regulation, 0.1C preconditioning, and thermal foldback to prevent overheating in sealed enclosures.

Use Value: Enables full-featured charging in <30 mm² PCB area; VPCC prevents audio dropouts during USB cable flex-induced input sag.

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 charge voltage; no VPCC; 1.5A max input; no LBO output; uses external sense resistor for current setting.	Lacks system load priority control and integrated LBO - requires external comparator for low-battery detection.	Select when cost sensitivity outweighs need for dynamic input prioritization and integrated status signaling.
TPS65023RSBR	Multi-rail PMIC with 4.2V charger; includes DC-DC converters; 1.2A max charge current; no VPCC; requires I²C configuration.	Higher integration but adds complexity and footprint; not pin-compatible; lacks autonomous power-path arbitration.	Choose only if system requires additional regulated rails (e.g., core voltage, I/O voltage) alongside charging.

Compared with BQ24075RGTR and TPS65023RSBR, the MCP73871T-1AAI/ML uniquely combines VPCC-based load priority, factory-trimmed 4.20V regulation, integrated LBO, and QFN-20 packaging - delivering superior simplicity and reliability for standalone portable battery systems.

Availability

MCP73871T-1AAI/ML is available at Aetrix Electronics and suitable for GPS navigation devices, portable medical monitors, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MCP73871T-1AAI/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 Inc. is a leading provider of microcontrollers, analog devices, and battery management ICs, serving automotive, industrial, 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 to eliminate external FETs, reduce bill-of-materials, and simplify USB/AC-DC dual-source battery charging.

FAQ

What is the exact charge voltage setting for MCP73871T-1AAI/ML?

The MCP73871T-1AAI/ML is factory-configured for 4.20V constant-voltage regulation with ±0.5% tolerance at +25°C, as indicated by the '1' in its part number per Microchip's Product Identification System. This matches standard single-cell Li-Ion battery requirements and is internally trimmed - no external components are needed to set or adjust this voltage.

How does MCP73871T-1AAI/ML prioritize system load over battery charging?

The MCP73871T-1AAI/ML implements Voltage Proportional Current Control (VPCC): when the voltage at the VPCC pin drops below 1.23V (e.g., due to USB cable resistance or weak adapter), it automatically reduces battery charge current to preserve system power delivery at OUT. This ensures uninterrupted operation even under marginal input conditions.

What does the 'AAI' suffix in MCP73871T-1AAI/ML indicate?

The 'AAI' suffix specifies three factory-set options: 'A' = LBO disabled? No - per DS20002090E-page 19, third character 'A' means LBO threshold is 3.0V; first 'A' = timer disabled? No - second character 'A' means 4-hour safety timer enabled; 'I' = package = 20-lead QFN. So 'AAI' confirms 4.20V charge voltage, 3.0V LBO, 4-hour timer, and QFN packaging.

Can MCP73871T-1AAI/ML operate without a battery connected?

Yes - the MCP73871T-1AAI/ML powers the system load directly from IN to OUT even with no battery present or with a deeply depleted battery (down to 0V). Its system load sharing architecture ensures OUT remains active as long as IN exceeds UVLO, making it ideal for cradle or dock applications where battery may be removed.

What thermal management features does MCP73871T-1AAI/ML include?

The MCP73871T-1AAI/ML includes die-temperature-based thermal regulation (150°C shutdown with 10°C hysteresis), an exposed thermal pad (EP) tied to VSS for PCB heat sinking, and 50 μA thermistor bias for external NTC monitoring. These features collectively prevent thermal runaway during high-current charging in compact enclosures.

MCP73871T-1AAI/ML Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 20-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

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:: 4.1V

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)

MCP73871T-1AAI/ML FAQ

1.How can I place an order for MCP73871T-1AAI/ML through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73871T-1AAI/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 MCP73871T-1AAI/ML reliable?

The price and inventory of MCP73871T-1AAI/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73871T-1AAI/ML is usually 5 days.

3.What payment methods are accepted for MCP73871T-1AAI/ML?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73871T-1AAI/ML transactions.

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MCP73871T-1AAI/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73871T-1AAI/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 MCP73871T-1AAI/ML?

For technical support, including MCP73871T-1AAI/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73871T-1AAI/ML requirements.

6.How does Aetrix verify that MCP73871T-1AAI/ML is sourced from the original manufacturer or authorized distributors?

All MCP73871T-1AAI/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 MCP73871T-1AAI/ML meets industry standards.

7.What is the process for return or replacement of MCP73871T-1AAI/ML?

All MCP73871T-1AAI/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73871T-1AAI/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 MCP73871T-1AAI/ML part is unused and in its original packaging.

Return procedure for MCP73871T-1AAI/ML:

1.Submit a request within 90 days.

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

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