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Microchip Technology MCP73871T-2CAI/ML
- Part No.:
- MCP73871T-2CAI/ML
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MCP73871T-2CAI/ML.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
MCP73871T-2CAI/ML from Microchip Technology is a fully integrated linear Li-Ion/Li-Polymer battery charge management IC with autonomous system load sharing, dual-input power 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 electronics while charging batteries without requiring external MOSFETs or sense resistors.
For engineers reviewing the MCP73871T-2CAI/ML datasheet, MCP73871T-2CAI/ML pinout, MCP73871T-2CAI/ML application, or MCP73871T-2CAI/ML equivalent, key selection criteria include its 4.20V fixed charge voltage, 20-pin QFN (4 mm × 4 mm) package with exposed thermal pad, VPCC-based input priority control, LBO threshold of 3.1V, and 6-hour safety timer - all confirmed for this exact variant.
Technical Context
The MCP73871T-2CAI/ML implements a constant-current/constant-voltage (CC/CV) charge algorithm with resistor-programmable fast charge current (50 mA to 1 A), automatic preconditioning for deeply depleted cells (0.1C), and selectable termination current ratio (7.5–12.5% of IREG). Its Voltage Proportional Current Control (VPCC) dynamically reduces battery charge current when input voltage drops, preserving system load priority.
It integrates dual pass transistors (IN→OUT and VBAT→OUT) with 200 mΩ RDS(on), reverse discharge protection, and thermistor-based battery temperature monitoring using a 50 μA bias current. The device supports autonomous power-source arbitration between battery and input, with UVLO hysteresis of 90 mV and die thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±0.5% - precisely regulates single-cell Li-ion battery to standard full-charge level with minimal voltage drift over temperature. |
| Max Input Current | 1.8A total - shared between system load and battery charge; enables high-power portable devices without external current limiting. |
| Fast Charge Current | Resistor-programmable 50 mA to 1 A - allows precise tailoring of charge rate to battery capacity and thermal constraints. |
| LBO Threshold | 3.1V - triggers low-battery alert when operating from battery, enabling graceful system shutdown before brownout. |
| Safety Timer | 6 hours - prevents indefinite charging under fault conditions; enabled by default per "C" in part number suffix. |
| Operating Temp | −40°C to +85°C - fully specified for industrial and consumer portable applications including GPS, medical devices, and wearables. |
| Package | 20-Lead QFN (4 mm × 4 mm) with exposed thermal pad - provides low thermal resistance (θJA = 50°C/W) for reliable operation under sustained 1.8A load. |
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 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 absent or deeply depleted battery via power-path arbitration. |
| 2 (VPCC) | Voltage proportional charge control input | Enables dynamic reduction of battery charge current when input voltage sags - preserves system load priority during weak USB or wall adapter sources. |
| 3 (SEL) | Input source type selection | High = AC-DC adapter mode (1.8A total input); Low = USB mode (100/500 mA compliance); determines current limit architecture and PROG2 function. |
| 4 (PROG2) | USB input current limit select | Digital control: Low = 100 mA (1 unit load), High = 500 mA (5 unit load); only active when SEL = Low per USB specification. |
| 5 (THERM) | Thermistor monitoring I/O | Accepts NTC thermistor voltage; internal 50 μA bias enables battery temperature window detection (1.24V/0.25V thresholds) to suspend charging outside safe range. |
| 6 (PG) | Power Good status output | Open-drain indicator: Low = valid input supply > UVLO and > VBAT; used for host MCU power sequencing or LED status. |
| 7 (STAT2) | Charge status output 2 | Open-drain signal indicating charge complete (low) or active charging (high); complements STAT1 for multi-state visual or digital status reporting. |
| 8 (STAT1/LBO) | Charge status / low battery output | Open-drain dual-function: Low during charging or low-battery condition (VBAT < 3.1V while running on battery); supports LED or MCU interface. |
| 9 (TE) | Timer Enable input | Active-low enable for 6-hour safety timer; disabling halts timer without resetting - useful when system load limits available charge current. |
| 10, 11, EP (VSS) | Battery management ground reference | Common 0V return for battery, system, input, and thermal pad; EP must be soldered to PCB ground plane for thermal and electrical integrity. |
| 12 (PROG3) | Termination set point input | Resistor-to-VSS sets charge termination current ratio (7.5–12.5% of IREG); applies to both USB and AC-DC modes. |
| 13 (PROG1) | Fast charge current regulation | Resistor-to-VSS programs max CC current (50 mA–1 A); also sets preconditioning current ratio (10% of IREG) for deeply depleted cells. |
| 14, 15 (VBAT) | Battery positive connection | Main battery terminal; carries full charge/discharge current; requires ≥4.7 μF bypass capacitor for stability when disconnected. |
| 16 (VBAT_SENSE) | Battery voltage sense input | High-impedance feedback node for precision VREG regulation; senses battery voltage independently of IR drop in VBAT trace. |
| 17 (CE) | Charge Enable input | Active-high digital enable; disables charging (but not system power delivery) when low; compatible with 1.8V logic. |
| 18, 19 (IN) | Power supply input | Dual-pin input for 4.3V–6V supply; accepts USB or AC-DC adapter; requires ≥4.7 μF bypass capacitor per pin for EMI suppression and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power-path management | Eliminates need for external ideal diodes or OR-ing controllers; enables seamless transition between battery and input power with no system interruption. |
| Voltage Proportional Current Control (VPCC) | Automatically throttles battery charge current when input voltage drops below 1.23V threshold - ensures system load remains powered during marginal input conditions. |
| Resistor-programmable charge parameters | Single external resistor per function (PROG1, PROG2, PROG3) configures fast charge current, USB current limit, and termination threshold - reduces BOM count and design complexity. |
| Thermal regulation with die temperature sensing | Reduces charge current above 105°C junction temperature to prevent thermal runaway - maintains reliability during high-ambient or high-load operation. |
| Low-battery indicator with 3.1V threshold | Provides early warning of battery depletion while operating from battery - enables firmware-controlled shutdown before system reset or data loss. |
| 6-hour safety timer with TE control | Prevents overcharge under fault conditions; timer can be disabled via TE pin without resetting - supports flexible system-level charge supervision. |
Applications
| GPS Navigation Devices | Portable Medical Monitors |
|---|---|
Use Scenario: Battery-powered handheld GPS units requiring continuous operation during vehicle charging or USB tethering. IC Role / Device Role / Timing Role: Dual-role power manager: delivers stable 3.3V/5V system rail while simultaneously charging single-cell Li-ion battery at up to 1 A. Use Value: Enables uninterrupted navigation during charging; VPCC prevents system brownout when USB port supplies weak current; LBO alerts user before battery exhaustion. | Use Scenario: Wearable pulse oximeters or glucose meters needing reliable, compact, and safety-certifiable battery charging. IC Role / Device Role / Timing Role: Certified charge controller with thermal monitoring, 6-hour safety timer, and precise 4.20V regulation meeting medical battery standards. Use Value: Eliminates risk of overvoltage or overtemperature charging; THERM pin supports NTC-based temperature validation required for IEC 62304 compliance. |
| Bluetooth Headsets | Smartphone Docking Stations |
Use Scenario: Ultra-compact wireless earbuds with tight space constraints and USB-C charging via case. IC Role / Device Role / Timing Role: Space-optimized linear charger in 4 mm × 4 mm QFN; manages battery charge and case system power from single USB input. Use Value: Reduces component count vs. discrete solutions; 200 mΩ RDS(on) minimizes heat in sealed enclosure; PROG2 enables strict USB 100 mA compliance during enumeration. | Use Scenario: Desktop cradles that charge smartphones while powering USB peripherals and display interfaces. IC Role / Device Role / Timing Role: System load-sharing hub: draws up to 1.8A from AC adapter to power dock electronics and charge phone battery concurrently. Use Value: Prevents phone battery cycling during dock use; VPCC ensures dock stays powered if AC adapter voltage sags; PG signal synchronizes peripheral enable timing. |
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, 1.5A max input, no VPCC, no LBO output, 3x3 mm QFN-16 | Lacks system load priority arbitration and battery temperature monitoring; suitable only for simple charge-only systems. | Select when board space is critical and thermal/temperature safety features are not required. |
| MAX1555EZK+T | Fixed 4.2V, 500 mA max charge current, no programmable termination, no THERM pin, SOT23-6 | Lower integration: requires external diode for load sharing; limited to low-power accessories without thermal oversight. | Choose for cost-sensitive, low-current (<500 mA) applications where footprint is paramount and safety features are secondary. |
Compared with BQ24075RGTR and MAX1555EZK+T, the MCP73871T-2CAI/ML uniquely combines VPCC-based load priority, integrated thermistor monitoring, LBO indication, and 6-hour safety timer in a single 20-pin QFN - making it the only option supporting robust, self-contained charging for mission-critical portable systems.
Availability
MCP73871T-2CAI/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-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 Inc. is a leading provider of microcontrollers, analog components, and battery management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP73871 product line delivers fully integrated, single-chip Li-ion charge management with system load sharing - designed specifically for space-constrained, battery-powered portable electronics needing autonomous power arbitration and comprehensive safety features.
FAQ
What is the exact charge voltage setting for MCP73871T-2CAI/ML?
The MCP73871T-2CAI/ML is factory-configured for a precise 4.20V constant-voltage charge regulation with ±0.5% tolerance across −40°C to +85°C. This value is fixed and cannot be altered externally - it corresponds to the "2" in the part number suffix and matches standard single-cell Li-ion chemistry requirements.
Does MCP73871T-2CAI/ML support USB 2.0 compliance for current draw?
Yes, MCP73871T-2CAI/ML supports USB 2.0 compliance through its SEL and PROG2 pins: when SEL = Low, PROG2 = Low configures 100 mA (1 unit load) and PROG2 = High configures 500 mA (5 unit load), both adhering to USB specification limits during enumeration and charging.
What does the "C" in MCP73871T-2CAI/ML indicate?
The "C" in MCP73871T-2CAI/ML denotes the low-battery output (LBO) threshold of 3.1V and enables the 6-hour safety timer. Per Microchip's product identification system, the third character defines LBO voltage (C = 3.1V) and the second character defines timer duration (C = 6 hours).
How does MCP73871T-2CAI/ML handle power source arbitration between USB and battery?
MCP73871T-2CAI/ML uses integrated power-path MOSFETs and VPCC logic to autonomously prioritize the system load: when input is present, it powers the OUT rail directly while charging the battery; if input drops, it seamlessly switches to battery without interruption - all without host MCU intervention.
Can MCP73871T-2CAI/ML operate without an external thermistor?
Yes, MCP73871T-2CAI/ML operates safely without a thermistor: the THERM pin defaults to high-impedance and disables temperature monitoring. However, for applications requiring JEDEC JESD22-A104 or IEC 62133 compliance, connecting a 10 kΩ NTC thermistor is mandatory to enable thermal fault suspension.
MCP73871T-2CAI/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-2CAI/ML FAQ
1.How can I place an order for MCP73871T-2CAI/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73871T-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 MCP73871T-2CAI/ML reliable?
The price and inventory of MCP73871T-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 MCP73871T-2CAI/ML is usually 5 days.
3.What payment methods are accepted for MCP73871T-2CAI/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73871T-2CAI/ML transactions.
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4.How is shipping managed for MCP73871T-2CAI/ML?
MCP73871T-2CAI/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73871T-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 MCP73871T-2CAI/ML?
For technical support, including MCP73871T-2CAI/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73871T-2CAI/ML requirements.
6.How does Aetrix verify that MCP73871T-2CAI/ML is sourced from the original manufacturer or authorized distributors?
All MCP73871T-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 MCP73871T-2CAI/ML meets industry standards.
7.What is the process for return or replacement of MCP73871T-2CAI/ML?
All MCP73871T-2CAI/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73871T-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 MCP73871T-2CAI/ML part is unused and in its original packaging.
Return procedure for MCP73871T-2CAI/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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