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

Microchip Technology MCP73871-1CAI/ML

Name: MCP73871-1CAI/ML
Brand: Microchip Technology
SKU: MCP73871-1CAI/ML
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73871-1CAI/ML

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 20-VFQFN Exposed Pad

Datasheet:: MCP73871-1CAI/ML.pdf

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

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Product details

Overview

MCP73871-1CAI/ML from Microchip Technology is a fully integrated linear Li-Ion/Li-Polymer battery charge management IC with autonomous system load sharing, dual-input source selection (USB or AC-DC), ±0.5% voltage regulation at 4.20V, 1.8A total input current limit, and thermal regulation. It powers portable systems while charging batteries in GPS navigators, Bluetooth headsets, and medical devices.

For engineers reviewing the MCP73871-1CAI/ML datasheet, MCP73871-1CAI/ML pinout, MCP73871-1CAI/ML application, or MCP73871-1CAI/ML equivalent, key selection criteria include VPCC-based input priority control, resistor-programmable 50 mA–1 A fast charge current, 4.20 V ±0.5% charge voltage, -40°C to +85°C operation, and 20-lead QFN (4 mm × 4 mm) package with exposed thermal pad.

Technical Context

The MCP73871-1CAI/ML implements a constant-current/constant-voltage (CC/CV) charge algorithm with selectable termination via PROG3, preconditioning for deeply depleted cells (0.1C), and thermal regulation that dynamically reduces charge current above 150°C junction temperature. Its Voltage Proportional Current Control (VPCC) circuit ensures system load receives priority over battery charging when input supply is constrained.

It integrates dual pass transistors (IN→OUT and VBAT→OUT) with 200 mΩ R_DS(on), reverse discharge protection, undervoltage lockout (UVLO) with 90 mV hysteresis, and four open-drain status outputs (STAT1/LBO, STAT2, PG, TE) supporting LED or microcontroller interface. The device supports autonomous power-source arbitration between battery and input without external logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Voltage	4.20 V ±0.5% - precise regulation for standard single-cell Li-Ion chemistry, ensuring safe full-charge termination without overvoltage stress.
Max Input Current	1.8 A total - shared between system load and battery charge; enables high-power portable designs with USB or wall adapter input.
Fast Charge Current	50 mA to 1 A - resistor-programmable via PROG1 (1 kΩ–10 kΩ), allowing design flexibility across battery capacities from 100 mAh to 1000 mAh.
Thermal Shutdown	150°C with 10°C hysteresis - protects IC and battery during sustained high ambient or high-power operation; automatically resumes after cooldown.
Operating Temp	-40°C to +85°C - fully specified industrial temperature range, suitable for consumer and portable medical equipment deployment.
Package	20-Lead QFN (4 mm × 4 mm) with exposed thermal pad - low-profile, thermally efficient packaging enabling compact PCB layouts in space-constrained handhelds.
LBO Threshold	3.1 V - factory-configured low-battery detection ('C' in part number), enabling system-level power management when running on battery only.
Safety Timer	6 hours - enabled by default ('C' in part number), prevents indefinite charging and mitigates risk from faulty batteries or sensor failures.

Pinout & Package

Package: 20-Lead QFN (4 mm × 4 mm) with exposed thermal pad (EP), internally connected to VSS. Requires PCB thermal pad connection for reliable thermal performance and electrical reference stability.

Pin/Terminal	Circuit Role	Design Meaning
1, 20 (OUT)	System Output Terminal	Delivers regulated power to system load; maintains operation even with absent/defective battery; bypass with ≥4.7 μF capacitor.
2 (VPCC)	Voltage Proportional Charge Control Input	Enables dynamic current reduction when input voltage sags; set to ≥1.23 V to activate priority-based load sharing.
3 (SEL)	Input Source Selection	High = AC-DC adapter mode (1.8 A total); Low = USB mode (100/500 mA compliance); determines PROG2 function.
4 (PROG2)	USB Input Current Select	Digital input: Low = 100 mA, High = 500 mA USB current limit; only active when SEL = Low.
5 (THERM)	Thermistor Monitoring I/O	50 μA bias current source for NTC thermistor; compares voltage to 1.24 V / 0.25 V thresholds for over/under-temperature fault suspension.
6 (PG)	Power Good Output	Open-drain indicator: Low = valid input supply > UVLO threshold and > VBAT; used for host power-status signaling or LED indication.
7 (STAT2)	Charge Status Output 2	Open-drain output indicating charge cycle state (e.g., FAST CHARGE, CHARGE COMPLETE); complements STAT1 for multi-state UI feedback.
8 (STAT1/LBO)	Charge Status / Low Battery Output	Open-drain dual-function: Low = active charge or low-battery condition (VBAT < 3.1 V while VIN < VBAT); supports LED or MCU interrupt.
9 (TE)	Timer Enable Input	Active-low enable for 6-hour safety timer; high = disabled; compatible with 1.8 V logic; timer reset requires CE toggle.
10, 11, EP (VSS)	Battery Management Ground	Common 0 V reference for battery, system load, and input; EP must be soldered to PCB ground plane for thermal and electrical integrity.
12 (PROG3)	Termination Set Point	Resistor-programmed termination current ratio (7.5–12.5% of I_REG); sets end-of-charge threshold for both USB and AC-DC modes.
13 (PROG1)	Fast Charge Current Set	Resistor-to-VSS sets max CC current (50 mA–1 A); also defines preconditioning current (10% of I_REG) for deeply discharged cells.
14, 15 (VBAT)	Battery Positive Connection	Main battery terminal; connects to Li-Ion anode; bypass with ≥4.7 μF capacitor for loop stability during charge/discharge transients.
16 (VBAT_SENSE)	Battery Voltage Sense	Precision sense node for V_REG regulation; internal 0.001 V/V gain enables accurate closed-loop voltage control independent of trace resistance.
17 (CE)	Charge Enable Input	Active-high enable for charging function; low disables all charge activity while preserving system power delivery via OUT.
18, 19 (IN)	Power Supply Input	Accepts 4.3 V–6 V input from USB or AC-DC; bypass with ≥4.7 μF capacitor; UVLO triggers at V_START ≈ V_REG + 0.15 V.

Key Features

Feature	Design Value
Voltage Proportional Current Control (VPCC)	Ensures uninterrupted system operation by reducing battery charge current before input voltage collapse-critical for USB-powered devices with variable source impedance.
Integrated Power Path Management	Eliminates need for external ideal diodes or OR-ing controllers; enables seamless transition between battery and input power with <200 mΩ path resistance.
Factory-Configured LBO & Safety Timer	3.1 V low-battery threshold and 6-hour safety timer ('C' suffix) are laser-trimmed and production-tested-no external components or firmware required for basic protection.
Thermistor-Based Temperature Monitoring	On-chip 50 μA bias and dual-threshold comparators support standard 10 kΩ NTC thermistors for JEDEC JESD22-A104-compliant thermal charge profiling.
USB-Compliant Input Current Limiting	Hardware-selectable 100 mA / 500 mA USB current limits (via PROG2) meet USB 2.0 specification without host negotiation or enumeration overhead.
Preconditioning for Deeply Depleted Cells	Automatic 0.1C trickle charge (e.g., 100 mA for 1000 mAh cell) restores cells below 2.9 V safely before CC mode-prevents lithium plating and extends cycle life.

Applications

GPS Navigation Devices	Bluetooth Headsets
Use Scenario: Portable GPS units requiring continuous operation during vehicle charging and battery backup during signal loss or movement. IC Role / Device Role / Timing Role: Dual-role power manager: supplies system from USB/12 V adapter while simultaneously charging Li-Polymer battery; VPCC prevents brownout during high-current GPS RF bursts. Use Value: Enables uninterrupted navigation with automatic fallback to battery without software intervention; 4.20 V regulation matches common 3.7 V nominal Li-Polymer cells.	Use Scenario: Compact wireless audio accessories with limited PCB area, needing USB recharging and battery runtime extension. IC Role / Device Role / Timing Role: Single-chip USB battery charger and system power switch; PROG2 selects 500 mA USB current for faster recharge; STAT1/LBO signals low battery to host MCU for voice alerts. Use Value: Reduces BOM count by eliminating discrete MOSFETs, current-sense resistors, and thermal monitoring ICs-cuts layout area by >30% vs. discrete solutions.
Portable Medical Monitors	Digital Cameras
Use Scenario: Handheld ECG or pulse oximeters operating in clinical and home settings, requiring FDA-aligned safety timers and temperature-aware charging. IC Role / Device Role / Timing Role: Safety-critical battery manager: 6-hour hardware timer prevents overcharge; THERM pin monitors battery temperature per IEC 62368-1; LBO at 3.1 V triggers audible low-power warning. Use Value: Meets essential safety requirements without firmware validation burden; thermal fault suspension halts charging if battery exceeds 60°C-reducing fire risk.	Use Scenario: DSLR or mirrorless camera grips and accessories needing rapid recharge from USB-C PD or proprietary adapters. IC Role / Device Role / Timing Role: High-current linear charger supporting up to 1 A fast charge; SEL pin configures for AC adapter (1.8 A total) or USB (500 mA); PG output confirms adapter presence before enabling flash charging. Use Value: Achieves <90-minute full charge for 1500 mAh Li-Ion packs using standard 5 V/2 A USB sources-enabling field-deployable power without proprietary chargers.

GPS Navigation Devices

Bluetooth Headsets

Use Scenario: Portable GPS units requiring continuous operation during vehicle charging and battery backup during signal loss or movement.

IC Role / Device Role / Timing Role: Dual-role power manager: supplies system from USB/12 V adapter while simultaneously charging Li-Polymer battery; VPCC prevents brownout during high-current GPS RF bursts.

Use Value: Enables uninterrupted navigation with automatic fallback to battery without software intervention; 4.20 V regulation matches common 3.7 V nominal Li-Polymer cells.

Use Scenario: Compact wireless audio accessories with limited PCB area, needing USB recharging and battery runtime extension.

IC Role / Device Role / Timing Role: Single-chip USB battery charger and system power switch; PROG2 selects 500 mA USB current for faster recharge; STAT1/LBO signals low battery to host MCU for voice alerts.

Use Value: Reduces BOM count by eliminating discrete MOSFETs, current-sense resistors, and thermal monitoring ICs-cuts layout area by >30% vs. discrete solutions.

Portable Medical Monitors

Digital Cameras

Use Scenario: Handheld ECG or pulse oximeters operating in clinical and home settings, requiring FDA-aligned safety timers and temperature-aware charging.

IC Role / Device Role / Timing Role: Safety-critical battery manager: 6-hour hardware timer prevents overcharge; THERM pin monitors battery temperature per IEC 62368-1; LBO at 3.1 V triggers audible low-power warning.

Use Value: Meets essential safety requirements without firmware validation burden; thermal fault suspension halts charging if battery exceeds 60°C-reducing fire risk.

Use Scenario: DSLR or mirrorless camera grips and accessories needing rapid recharge from USB-C PD or proprietary adapters.

IC Role / Device Role / Timing Role: High-current linear charger supporting up to 1 A fast charge; SEL pin configures for AC adapter (1.8 A total) or USB (500 mA); PG output confirms adapter presence before enabling flash charging.

Use Value: Achieves <90-minute full charge for 1500 mAh Li-Ion packs using standard 5 V/2 A USB sources-enabling field-deployable power without proprietary chargers.

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 4.2 V charge voltage, no VPCC, 1.5 A max input, no LBO output, 16-pin QFN	Lacks system load priority and low-battery indication; requires external circuitry for USB current limiting	Choose for cost-sensitive, non-USB-hosted applications where VPCC and LBO are unnecessary
MAX1555EZK+T	Fixed 4.2 V, 500 mA max charge current, no programmable termination, no thermal monitoring, SOT-23-6	Targeted at ultra-compact, low-power devices; lacks QFN thermal performance and multi-source arbitration	Choose for space-constrained wearables with sub-500 mAh batteries and no temperature monitoring requirement

Compared with BQ24075RGTR and MAX1555EZK+T, the MCP73871-1CAI/ML uniquely delivers integrated VPCC-based load priority, factory-trimmed 3.1 V LBO, and 6-hour hardware safety timer in a thermally robust 20-QFN-making it optimal for USB-powered portable electronics requiring autonomous, safe, and responsive power management.

Availability

MCP73871-1CAI/ML is available at Aetrix Electronics and suitable for GPS navigators, Bluetooth headsets, and portable medical devices requiring stable component supply, industrial-grade temperature operation, and long-term lifecycle availability.

Supply support for MCP73871-1CAI/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 components, and battery management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and comprehensive development tools.

The MCP73871 product line delivers fully integrated, single-chip Li-Ion charge controllers with system load sharing-designed specifically for space-constrained portable electronics needing autonomous power arbitration, USB compliance, and robust thermal safety.

FAQ

What is the exact charge voltage setting for MCP73871-1CAI/ML?

The MCP73871-1CAI/ML is factory-configured for 4.20 V ±0.5% constant-voltage regulation, as indicated by the '1' in the part number ('1' = 4.20 V option). This value is laser-trimmed and tested across -40°C to +85°C ambient, ensuring compatibility with standard single-cell Li-Ion and Li-Polymer batteries without external calibration.

How does the VPCC feature function in MCP73871-1CAI/ML?

The VPCC feature in MCP73871-1CAI/ML monitors input voltage via Pin 2 and reduces battery charge current proportionally when VIN drops near the 1.23 V VPCC threshold-ensuring system load (OUT) retains priority. It activates automatically when VPCC ≥ 1.23 V and is disabled if VPCC is tied directly to IN, making it configurable per application needs.

What does the 'C' in MCP73871-1CAI/ML signify?

The first 'C' (third character) in MCP73871-1CAI/ML denotes a 3.1 V low-battery output (LBO) threshold, and the second 'C' (fourth character) specifies a 6-hour safety timer interval. Both are factory-laser-trimmed features-no external components or configuration registers are needed to enable either function in the MCP73871-1CAI/ML.

Can MCP73871-1CAI/ML operate with both USB and AC-DC inputs simultaneously?

No-MCP73871-1CAI/ML performs autonomous single-source selection, not simultaneous dual-input operation. The SEL pin (Pin 3) configures the device for either USB mode (SEL = Low) or AC-DC mode (SEL = High); it does not parallel or combine inputs. Input arbitration is based on presence and UVLO status-not concurrent use.

What thermal management provisions does MCP73871-1CAI/ML include?

MCP73871-1CAI/ML includes three thermal protections: (1) thermal regulation that reduces charge current above ~105°C junction temperature, (2) thermal shutdown at 150°C with 10°C hysteresis, and (3) integrated thermistor monitoring via THERM pin with 50 μA bias and dual-voltage thresholds (1.24 V / 0.25 V) for battery temperature fault detection during charging.

MCP73871-1CAI/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:: 4.1V

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)

MCP73871-1CAI/ML FAQ

1.How can I place an order for MCP73871-1CAI/ML through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73871-1CAI/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 MCP73871-1CAI/ML reliable?

The price and inventory of MCP73871-1CAI/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73871-1CAI/ML is usually 5 days.

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MCP73871-1CAI/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

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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 MCP73871-1CAI/ML?

For technical support, including MCP73871-1CAI/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73871-1CAI/ML requirements.

6.How does Aetrix verify that MCP73871-1CAI/ML is sourced from the original manufacturer or authorized distributors?

All MCP73871-1CAI/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 MCP73871-1CAI/ML meets industry standards.

7.What is the process for return or replacement of MCP73871-1CAI/ML?

All MCP73871-1CAI/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73871-1CAI/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 MCP73871-1CAI/ML part is unused and in its original packaging.

Return procedure for MCP73871-1CAI/ML:

1.Submit a request within 90 days.

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

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