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Microchip Technology MCP73871T-2AAI/ML
- Part No.:
- MCP73871T-2AAI/ML
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MCP73871T-2AAI/ML.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
MCP73871T-2AAI/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 features ±0.5% voltage regulation at 4.20 V, resistor-programmable fast charge current up to 1 A, thermal regulation, and integrated reverse discharge protection - used in portable medical devices and Bluetooth headsets.
For engineers reviewing the MCP73871T-2AAI/ML datasheet, MCP73871T-2AAI/ML pinout, MCP73871T-2AAI/ML application, or MCP73871T-2AAI/ML equivalent, key selection criteria include VPCC-based input priority control, dual-source (USB/AC) current limiting, LBO threshold configuration (3.0 V), 4-hour safety timer, and QFN-20 package thermal performance.
Technical Context
The MCP73871T-2AAI/ML implements a constant-current/constant-voltage (CC/CV) charge algorithm with four factory-set regulation voltages (4.10 V/4.20 V/4.35 V/4.40 V); this variant is configured for 4.20 V. It uses Voltage Proportional Current Control (VPCC) to dynamically reduce charge current when input voltage sags, preserving system load priority.
Its dual-path power-path architecture includes ideal diode operation between IN→OUT and VBAT→OUT, with 200 mΩ ON-resistance for both pass transistors. The device integrates thermistor bias (50 μA), dual open-drain status outputs (STAT1/LBO, STAT2), PG indicator, and programmable termination via PROG3 (10 kΩ → 100 mA ITERM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±0.5% - precise regulation for standard single-cell Li-ion batteries |
| Max Input Current | 1.8 A total (system + charge) - supports high-power portable systems with wall adapter |
| Fast Charge Current | Programmable 50 mA to 1 A via PROG1 - enables flexible battery capacity matching |
| LBO Threshold | 3.0 V - triggers low-battery alert when operating from battery with VIN < VBAT |
| Safety Timer | 4 hours - prevents overcharge during abnormal conditions; enabled by TE pin low |
| Operating Temp | -40°C to +85°C - qualified for industrial and consumer portable environments |
| Package | 20-Lead QFN (4 mm × 4 mm) with exposed thermal pad - optimized for compact, thermally constrained PCBs |
Pinout & Package
Package: 20-Lead QFN (4 mm × 4 mm) with exposed thermal pad (EP), internally connected to VSS. Requires PCB thermal pad connection to ground plane 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 drops below 1.23 V threshold |
| 3 (SEL) | Input source selection | High = AC-DC adapter mode (1.8 A total current); Low = USB mode (100/500 mA limit) |
| 4 (PROG2) | USB current limit select | Digital input: Low = 100 mA, High = 500 mA - enforces USB specification compliance |
| 5 (THERM) | Thermistor monitoring I/O | 50 μA bias current source for NTC thermistor; compares voltage to 1.24 V / 0.25 V thresholds |
| 6 (PG) | Power Good status output | Open-drain; low when VIN > UVLO and VIN > VBAT - signals valid input power presence |
| 7 (STAT2) | Charge status output 2 | Open-drain; low at charge completion - used for LED or MCU interrupt signaling |
| 8 (STAT1/LBO) | Charge status / low battery output | Open-drain; low during charging or when VBAT < 3.0 V while running on battery |
| 9 (TE) | Timer Enable input | Active-low; disables internal 4-hour safety timer when high - allows host-controlled timing |
| 10, 11, EP (VSS) | Battery management ground | Common reference for battery, system, and input; EP must be soldered to PCB ground plane |
| 12 (PROG3) | Termination set point | Resistor-to-ground sets end-of-charge current ratio (e.g., 10 kΩ → 100 mA ITERM) |
| 13 (PROG1) | Fast charge current set | Resistor-to-ground programs max CC current (e.g., 1 kΩ → 1 A); also sets preconditioning ratio |
| 14, 15 (VBAT) | Battery positive connection | Direct connection to Li-ion cell anode; bypass capacitor required for stability |
| 16 (VBAT_SENSE) | Battery voltage sense | Precision feedback node for voltage regulation; internal 0.001× gain amplifier referenced to VREF |
| 17 (CE) | Charge enable input | Active-high; disables charging when low - enables host-controlled charge initiation |
| 18, 19 (IN) | Power supply input | Accepts 4.3 V to 6 V from USB or AC-DC; requires ≥4.7 μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated system load sharing | Ensures OUT powers system before charging battery - eliminates brownouts during deep discharge recovery |
| Voltage Proportional Current Control (VPCC) | Automatically scales charge current down as input voltage sags - preserves system voltage under weak sources |
| Resistor-programmable termination | PROG3 selects ITERM from 7.5 mA to 125 mA - matches battery chemistry and capacity requirements |
| Thermal regulation | Reduces charge current above 150°C junction temperature - prevents thermal runaway without external sensors |
| 0.1C preconditioning | Applies 10% of fast charge current to deeply depleted cells (<72% VREG) - prevents lithium plating damage |
| USB-compliant current limiting | Hardware-enforced 100/500 mA limits via PROG2 - eliminates software dependency for USB enumeration compliance |
Applications
| Portable Medical Devices | Bluetooth® Headsets |
|---|---|
Use Scenario: Wearable glucose monitor powered by single-cell Li-Po battery with USB recharging and continuous sensor operation. IC Role / Device Role / Timing Role: MCP73871T-2AAI/ML manages concurrent system load (sensor, BLE radio) and battery charging while enforcing medical-grade thermal safety. Use Value: 3.0 V LBO threshold alerts host MCU before critical shutdown; 4-hour safety timer prevents overcharge during unattended overnight charging. | Use Scenario: Compact wireless headset requiring seamless transition between USB charging and battery-powered audio playback. IC Role / Device Role / Timing Role: MCP73871T-2AAI/ML provides ideal diode path from IN to OUT, enabling instant system power-up even with 0% battery. Use Value: VPCC ensures stable 3.3 V rail during USB cable flex-induced voltage sag; 200 mΩ pass transistor minimizes dropout loss. |
| GPS Navigators | Portable Media Players |
Use Scenario: Automotive GPS unit with dual power sources: car USB port (500 mA) and 12 V adapter (via DC-DC + MCP73871T-2AAI/ML). IC Role / Device Role / Timing Role: MCP73871T-2AAI/ML autonomously selects highest-priority source (adapter > USB) and regulates 4.20 V battery charge. Use Value: SEL pin configures 1.8 A total current for fast recharge; THERM pin monitors battery temp during hot-car operation. | Use Scenario: MP3 player with 1000 mAh Li-ion battery, requiring full charge in <3 hours using wall adapter and status LED feedback. IC Role / Device Role / Timing Role: MCP73871T-2AAI/ML delivers CC/CV profile with STAT1/STAT2 driving dual-color LED (red=charging, green=complete). Use Value: Resistor-programmable PROG1 (1 kΩ) sets 1 A fast charge; PROG3 (10 kΩ) sets 100 mA termination for accurate full-charge detection. |
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 regulation; no VPCC; 1.5 A max input; no LBO output | Lacks system load priority and battery voltage monitoring; requires external LBO circuit | Choose BQ24075RGTR only if VPCC and integrated LBO are unnecessary and cost is primary constraint |
| MAX1555ESA+ | Fixed 4.2 V; 100/500 mA USB-only input; no AC-DC support; no thermal regulation | Not suitable for dual-source designs; limited to USB-powered devices without thermal safety | Select MAX1555ESA+ only for simple USB-only applications where AC-DC backup and thermal protection are omitted |
Compared with BQ24075RGTR and MAX1555ESA+, the MCP73871T-2AAI/ML uniquely combines VPCC-based input priority, integrated LBO at 3.0 V, and dual-source (USB/AC) support - making it optimal for portable systems requiring robust power path autonomy and thermal safety.
Availability
MCP73871T-2AAI/ML is available at Aetrix Electronics and suitable for portable medical devices, Bluetooth headsets, GPS navigators, and portable media players requiring stable component supply across production lifecycles.
Supply support for MCP73871T-2AAI/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 solutions.
The MCP73871 product line delivers autonomous, single-chip Li-ion charge management with integrated power-path control - designed specifically for space-constrained portable electronics needing simultaneous system operation and safe battery charging.
FAQ
What is the exact charge voltage regulation setting for MCP73871T-2AAI/ML?
The MCP73871T-2AAI/ML is factory-configured for 4.20 V ±0.5% constant-voltage regulation, matching standard single-cell Li-ion battery requirements. This value is fixed per the part number suffix '2' in the ordering code and cannot be altered externally. The MCP73871T-2AAI/ML achieves this using an internal precision voltage reference and feedback amplifier referenced to VBAT_SENSE.
How does the LBO function operate on MCP73871T-2AAI/ML?
The MCP73871T-2AAI/ML provides low-battery indication via the STAT1 pin when the system operates from the battery (VIN < VBAT) and VBAT falls below 3.0 V. This 3.0 V threshold is fixed per the 'A' in the third character of the part number and activates a dedicated comparator. The output is open-drain, requiring an external pull-up for LED or MCU interface.
What safety timer duration is implemented in MCP73871T-2AAI/ML?
The MCP73871T-2AAI/ML incorporates a 4-hour safety timer, indicated by the 'B' in the second character of its ordering code. The timer starts upon entering fast-charge mode and expires if charge completion (IBAT < ITERM) does not occur within 4 hours. It can be disabled by holding the TE pin high, and reset by toggling the CE pin.
Can MCP73871T-2AAI/ML support both USB and AC-DC input sources simultaneously?
No - the MCP73871T-2AAI/ML supports automatic selection between USB and AC-DC sources but not simultaneous use. The SEL pin determines the active source: SEL = Low configures USB mode (100/500 mA limits), while SEL = High configures AC-DC mode (up to 1.8 A total). The device prioritizes the selected source and disables the other path.
What is the purpose of the VPCC pin on MCP73871T-2AAI/ML?
The VPCC pin on MCP73871T-2AAI/ML enables Voltage Proportional Current Control: when the voltage at VPCC drops below 1.23 V (e.g., due to input source impedance), the IC reduces charge current to preserve system voltage at the OUT pin. This ensures system load priority during marginal input conditions - a key differentiator from basic charge controllers.
MCP73871T-2AAI/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:
- 4.2V
- 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)
MCP73871T-2AAI/ML FAQ
1.How can I place an order for MCP73871T-2AAI/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73871T-2AAI/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-2AAI/ML reliable?
The price and inventory of MCP73871T-2AAI/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-2AAI/ML is usually 5 days.
3.What payment methods are accepted for MCP73871T-2AAI/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73871T-2AAI/ML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73871T-2AAI/ML?
MCP73871T-2AAI/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73871T-2AAI/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-2AAI/ML?
For technical support, including MCP73871T-2AAI/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73871T-2AAI/ML requirements.
6.How does Aetrix verify that MCP73871T-2AAI/ML is sourced from the original manufacturer or authorized distributors?
All MCP73871T-2AAI/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-2AAI/ML meets industry standards.
7.What is the process for return or replacement of MCP73871T-2AAI/ML?
All MCP73871T-2AAI/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73871T-2AAI/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-2AAI/ML part is unused and in its original packaging.
Return procedure for MCP73871T-2AAI/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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