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Microchip Technology MCP73831T-4ADI/MC
- Part No.:
- MCP73831T-4ADI/MC
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP73831T-4ADI/MC.pdf
- Description:
- IC BATT CONTRL LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
MCP73831T-4ADI/MC from Microchip Technology is a miniature, fully integrated linear lithium-ion/lithium-polymer battery charge management controller in a 5-lead SOT-23 package. It delivers 4.50 V ±0.75% constant-voltage regulation, programmable fast-charge current up to 500 mA via external PROG resistor, and integrated reverse discharge protection - enabling compact USB-powered portable chargers for single-cell Li-ion batteries.
For engineers reviewing the MCP73831T-4ADI/MC datasheet, MCP73831T-4ADI/MC pinout, MCP73831T-4ADI/MC application, or MCP73831T-4ADI/MC equivalent, key selection criteria include its factory-set 4.50 V regulation voltage, tri-state STAT output, thermal regulation behavior, and compatibility with USB power bus specifications (3.75–6 V input, automatic UVLO, no external MOSFET required).
Technical Context
The MCP73831T-4ADI/MC implements a three-stage linear charging algorithm: preconditioning (trickle charge at 10%/20%/40% of IREG or disabled), constant-current fast charge, and constant-voltage regulation. Its internal P-channel MOSFET pass transistor features 350 mΩ typical RDS(on) at 105°C, and thermal regulation actively reduces charge current above ~105°C to prevent overheating without halting operation.
It integrates undervoltage lockout (UVLO start: 3.45 V ±150 mV, hysteresis 70 mV), battery presence detection (6 µA VBAT source, threshold at VREG + 100 mV), and automatic recharge (triggered when VBAT falls below 94–99% of VREG). The PROG pin serves dual roles: setting IREG (15–500 mA) and enabling/disabling charge via resistor connection or floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.50 V ±0.75% - factory-trimmed for high-accuracy charging of next-gen Li-ion cells requiring elevated termination voltage. |
| Charge Current Range | 15 mA to 500 mA - set by single external resistor (2–67 kΩ), enabling precise optimization for battery capacity and thermal limits. |
| Input Voltage Range | 3.75 V to 6 V - compliant with USB 2.0/3.0 bus (5 V ±10%) and wall adapters; includes UVLO with 70 mV hysteresis. |
| Operating Temp | -40°C to +85°C ambient - fully specified across industrial temperature range with thermal shutdown at 150°C (10°C hysteresis). |
| Package | SOT-23-5 - 2.9 mm × 1.6 mm footprint, 1.1 mm height; optimized for space-constrained portable designs. |
| STAT Output Type | Tri-state logic - supports LED indication (active-low during charge, high-Z when idle) or microcontroller interface without pull-up. |
| Reverse Discharge | <0.25 µA - prevents battery self-discharge when input is absent, critical for long shelf-life in battery-backed devices. |
Pinout & Package
Package: 5-Lead SOT-23 (2.9 mm × 1.6 mm × 1.1 mm), RoHS-compliant, with standard lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - STAT | Charge status indicator output | Tri-state logic signal: low during all charge phases, high when complete, high-Z in shutdown or no-battery condition. |
| 2 - VSS | Ground reference | Common return for battery negative, input supply negative, and PROG resistor; must be low-impedance PCB plane. |
| 3 - VBAT | Battery charge control output | Drain of internal P-MOSFET; connects directly to battery positive terminal; requires ≥4.7 µF ceramic bypass capacitor. |
| 4 - VDD | Input power supply | Accepts 3.75–6 V; internally regulated; bypass with ≥4.7 µF capacitor to VSS for stability and transient suppression. |
| 5 - PROG | Current regulation and enable | Resistor-to-VSS sets fast-charge current; floating disables device (IQ = 25 µA); also controls preconditioning and termination ratios. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Pass Transistor | Eliminates need for external MOSFET, reducing BOM count and PCB area in ultra-compact USB chargers. |
| Four Factory-Set VREG Options | 4.50 V variant (MCP73831T-4ADI/MC) supports higher-energy-density Li-ion and Li-polymer cells requiring elevated termination voltage. |
| Programmable Preconditioning | Selectable 10%/20%/40% or disable - protects deeply discharged cells while avoiding unnecessary trickle time. |
| Thermal Regulation | Dynamic current reduction above ~105°C - maintains safe die temperature without interrupting charge, optimizing cycle time under load. |
| Automatic Power-Down | Enters 25 µA sleep mode when VDD < VBAT + 50 mV or PROG impedance > 70 kΩ - preserves battery during adapter disconnection. |
Applications
| USB-Powered Portable Charger | Bluetooth Headset Battery Management |
|---|---|
Use Scenario: Compact wearable device powered via micro-USB port, requiring full Li-ion charge in ≤2 hours with minimal board space. IC Role / Device Role / Timing Role: Standalone linear charger IC managing full CC/CV algorithm, battery detection, and status signaling without host MCU intervention. Use Value: Enables single-chip solution with no external MOSFET or sense resistor; 4.50 V regulation matches high-capacity polymer cells used in premium headsets. | Use Scenario: Small-form-factor Bluetooth earbud case with integrated charging circuit for dual Li-ion cells. IC Role / Device Role / Timing Role: Primary charge controller for main battery pack; STAT output drives bi-color LED to indicate charging vs. full status. Use Value: Tri-state STAT simplifies LED drive (no external transistor); thermal regulation prevents overheating in sealed plastic enclosure during rapid charge. |
| Digital Camera Backup Power | Personal Data Assistant (PDA) Charging |
Use Scenario: Secondary battery compartment in DSLR grip, recharged from camera's USB-C port during tethered operation. IC Role / Device Role / Timing Role: Auxiliary linear charger IC providing independent, regulated charge path isolated from main system power rail. Use Value: Reverse discharge protection (<0.25 µA) ensures backup battery retains charge for weeks when camera is off. | Use Scenario: Legacy PDA with removable Li-ion battery, charged via mini-USB port with strict thermal envelope due to plastic housing. IC Role / Device Role / Timing Role: Integrated charge manager handling preconditioning, CC/CV, termination, and auto-recharge autonomously. Use Value: Programmable 4.50 V regulation extends runtime on aging cells; SOT-23-5 footprint fits legacy 4-layer PCB layouts without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-2ADI/MC | 4.20 V ±0.75% regulation voltage; identical pinout, package, and feature set. | Optimized for standard Li-ion cells; not suitable where 4.50 V termination is required for capacity or longevity. | Select only if battery chemistry mandates 4.20 V; otherwise, MCP73831T-4ADI/MC provides higher energy density support. |
| BQ24075RGTR | 4.2 V fixed regulation; includes integrated LDO for system power; different pinout (16-pin QFN); no 4.50 V option. | Designed for systems needing simultaneous battery charge + regulated system rail; larger footprint and higher cost. | Choose when dual-rail (VBUS → SYS + BAT) functionality is required; not drop-in compatible with MCP73831T-4ADI/MC layout. |
Compared with MCP73831T-2ADI/MC, the MCP73831T-4ADI/MC enables higher cell voltage termination for improved capacity retention in modern Li-polymer packs, while compared with BQ24075RGTR, it offers smaller size and lower system complexity where dedicated system power rail is unnecessary.
Availability
MCP73831T-4ADI/MC is available at Aetrix Electronics and suitable for USB-powered portable chargers, Bluetooth headset battery management, digital camera backup power, and personal data assistant (PDA) charging requiring stable component supply and industrial-temperature operation.
Supply support for MCP73831T-4ADI/MC 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP73831/2 product line was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully integrated, USB-compliant single-cell Li-ion/Li-polymer charging with minimal external components.
FAQ
What is the factory-set constant-voltage regulation value for MCP73831T-4ADI/MC?
The MCP73831T-4ADI/MC is factory-configured for 4.50 V ±0.75% constant-voltage regulation, supporting high-energy-density lithium-polymer cells that require elevated termination voltage for optimal capacity and cycle life. This value is laser-trimmed during production and cannot be adjusted externally - unlike variants such as MCP73831T-2ADI/MC (4.20 V) or MCP73831T-3ADI/MC (4.35 V).
Does MCP73831T-4ADI/MC require an external MOSFET for charging?
No, the MCP73831T-4ADI/MC integrates a P-channel MOSFET pass transistor with 350 mΩ typical RDS(on), eliminating the need for external switching components. This integration reduces bill-of-materials count, PCB area, and design complexity - making it ideal for ultra-compact USB-powered chargers where space and component count are critical constraints.
How does the STAT pin behave during different charge states in MCP73831T-4ADI/MC?
The STAT pin on MCP73831T-4ADI/MC is a tri-state logic output: it drives low during preconditioning, constant-current, and constant-voltage charge phases; goes high when charge completes and battery is fully regulated; and enters high-impedance state during shutdown, no-battery condition, or when PROG is floating. This allows direct LED drive or clean microcontroller GPIO interfacing without external pull-ups.
Can MCP73831T-4ADI/MC be used with USB 2.0 power sources?
Yes, MCP73831T-4ADI/MC is explicitly designed for USB compliance: it operates from 3.75 V to 6 V input, includes UVLO with 3.45 V start threshold and 70 mV hysteresis, and draws ≤500 mA - aligning with USB 2.0 port current limits. Its thermal regulation and automatic power-down ensure safe operation even during hot-plug events or varying bus voltages.
What is the maximum programmable charge current for MCP73831T-4ADI/MC?
The MCP73831T-4ADI/MC supports a maximum programmable fast-charge current of 500 mA, achieved by connecting a 2.0 kΩ resistor between PROG and VSS. This value is confirmed in the Electrical Characteristics table (DS20001984H, page 3) under "Fast Charge Current Regulation" with IREG = 450–550 mA typical at PROG = 2.0 kΩ, and is validated across -40°C to +85°C ambient temperature.
MCP73831T-4ADI/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 500mA
- Battery Pack Voltage:
- 4.4V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
MCP73831T-4ADI/MC FAQ
1.How can I place an order for MCP73831T-4ADI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73831T-4ADI/MC 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 MCP73831T-4ADI/MC reliable?
The price and inventory of MCP73831T-4ADI/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73831T-4ADI/MC is usually 5 days.
3.What payment methods are accepted for MCP73831T-4ADI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73831T-4ADI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73831T-4ADI/MC?
MCP73831T-4ADI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73831T-4ADI/MC 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 MCP73831T-4ADI/MC?
For technical support, including MCP73831T-4ADI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73831T-4ADI/MC requirements.
6.How does Aetrix verify that MCP73831T-4ADI/MC is sourced from the original manufacturer or authorized distributors?
All MCP73831T-4ADI/MC 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 MCP73831T-4ADI/MC meets industry standards.
7.What is the process for return or replacement of MCP73831T-4ADI/MC?
All MCP73831T-4ADI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP73831T-4ADI/MC, 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 MCP73831T-4ADI/MC part is unused and in its original packaging.
Return procedure for MCP73831T-4ADI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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