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Microchip Technology MCP73831-4ADI/MC
- Part No.:
- MCP73831-4ADI/MC
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP73831-4ADI/MC.pdf
- Description:
- IC BATT CONTRL LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,434
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Product details
Overview
MCP73831-4ADI/MC from Microchip Technology is a fully integrated linear lithium-ion/polymer battery charge management controller in 5-lead SOT-23 package, featuring 4.50 V ±0.75% constant-voltage regulation, programmable 15–500 mA fast-charge current via single PROG resistor, and tri-state STAT output for status indication. It delivers reverse discharge protection, thermal regulation, and automatic recharge in space-constrained USB-powered portable devices.
For engineers reviewing the MCP73831-4ADI/MC datasheet, MCP73831-4ADI/MC pinout, MCP73831-4ADI/MC application, or MCP73831-4ADI/MC equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative options - all aligned with DS20001984H revision H specifications and Microchip's official product identification system.
Technical Context
The MCP73831-4ADI/MC implements a three-phase linear charging algorithm: preconditioning (trickle charge at 10%/20%/40% of IREG or disabled), constant-current fast charge (programmable 15–500 mA), and constant-voltage regulation at factory-set 4.50 V ±0.75%. Charge termination occurs when average current falls to 5%/7.5%/10%/20% of IREG, with 1 ms filtering to reject transients.
It integrates a P-channel MOSFET pass transistor (RDS(ON) = 350 mΩ max at TJ = 105°C), internal current sense, UVLO with 3.45 V start/3.38 V stop thresholds and 70 mV hysteresis, and die-temperature-based thermal regulation that reduces charge current above ~105°C to prevent shutdown while optimizing cycle time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.50 V ±0.75% - factory-trimmed for high-accuracy Li-ion/Li-Po cell charging compliance |
| Charge Current Range | 15–500 mA - set by single external RPROG (2–67 kΩ), enabling precise C-rate tuning |
| Precondition Threshold | 66.5–74% of VREG - ensures safe trickle charge before full-current mode entry |
| Termination Ratio | 5%, 7.5%, 10%, or 20% of IREG - selectable via part variant to match battery chemistry requirements |
| Operating Temp | −40°C to +85°C ambient - fully specified for industrial and consumer portable environments |
| Package | SOT-23-5 - compact 2.9 mm × 1.6 mm footprint with exposed thermal pad (EP) tied to VSS |
| STAT Output Type | Tri-state logic - supports LED drive or microcontroller interface with HIGH/LOW/High-Z states |
Pinout & Package
Package: 5-Lead SOT-23 with exposed thermal pad (EP), EP internally connected to VSS and must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - STAT | Charge status indicator output | Tri-state logic output (HIGH/LOW/High-Z); drives LED directly or signals host MCU on charge state |
| 2 - VSS | Battery and supply ground reference | Common 0 V return for VDD, VBAT, PROG, and EP; must connect to PCB ground plane |
| 3 - VBAT | Battery charge control output | Drain of internal P-MOSFET; connects to battery positive terminal; requires ≥4.7 µF bypass capacitor |
| 4 - VDD | Input power supply input | 3.75–6 V input; includes UVLO (3.45 V start); bypass with ≥4.7 µF capacitor to VSS |
| 5 - PROG | Current regulation and enable input | Resistor-to-VSS sets IREG; floating disables device (IQ ≤ 25 µA); also enables manual shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-MOSFET pass transistor | RDS(ON) ≤ 350 mΩ at 105°C - eliminates external FET, reduces BOM count and layout area |
| Reverse discharge protection | ≤2 µA battery leakage when VDD absent - prevents battery drain during standby or disconnect |
| Thermal regulation | Dynamic current reduction above ~105°C - maintains charging without hard shutdown, improving reliability |
| Automatic recharge | Reinitiates charge when VBAT drops to 94–99% of VREG - sustains full capacity in intermittently powered systems |
| UVLO with hysteresis | 3.45 V start / 3.38 V stop (70 mV hysteresis) - prevents oscillation during brown-out and ensures clean startup |
Applications
| USB-Powered Portable Devices | Wearable Health Monitors |
|---|---|
|
Use Scenario: Compact wearable with single-cell Li-Po battery charged via micro-USB port under USB 2.0 power constraints (5 V ±5%, 500 mA max). IC Role / Device Role / Timing Role: Linear charge controller managing CC/CV profile, battery detection, and STAT-driven LED status feedback. Use Value: Enables full-featured charging in <3 mm² board area with no external MOSFET or sense resistor required. |
Use Scenario: ECG patch requiring ultra-low quiescent current between charges and reliable top-off after sensor usage drains battery to 3.6 V. IC Role / Device Role / Timing Role: Standalone charger with automatic recharge threshold (94–99% VREG) and <25 µA shutdown current. Use Value: Eliminates need for host MCU intervention while maintaining >98% usable battery capacity over repeated cycles. |
| Bluetooth Audio Accessories | Smart Home Sensors |
|
Use Scenario: True wireless stereo earbuds with tight thermal envelope where charging must avoid die temperature exceeding 125°C during 500 mA fast charge. IC Role / Device Role / Timing Role: Thermally regulated linear charger limiting ICHG above ~105°C to sustain safe operation without fan or heatsink. Use Value: Achieves 85% charge in <65 minutes while keeping PCB surface temp <45°C - critical for user comfort and safety certification. |
Use Scenario: Battery-powered Zigbee motion sensor deployed in unattended locations, requiring >2-year shelf life and field-rechargeability via USB-C. IC Role / Device Role / Timing Role: Low-leakage charger with <0.25 µA reverse discharge current and robust battery presence detection (>7 MΩ impedance tolerance). Use Value: Prevents >1% annual self-discharge loss due to charger circuitry, extending maintenance-free operation beyond specification. |
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 |
|---|---|---|---|
| MCP73831-2ADI/MC | 4.35 V regulation (±0.75%), same SOT-23-5 package, identical pinout and feature set | Targeted for standard 4.35 V Li-Po cells; not suitable for 4.50 V high-capacity variants | Select only if battery chemistry mandates 4.35 V CV; otherwise MCP73831-4ADI/MC is required for 4.50 V cells. |
| BQ24072RGTR | 4.2 V fixed CV, 100–1000 mA programmable CC, 6-pin QFN, integrated LDO for VBUS path | Lacks automatic recharge and has different STAT behavior (open-drain); higher IQ in shutdown (55 µA) | Choose when system requires VBUS pass-through or dual-path power routing; not drop-in for 4.50 V or tri-state STAT needs. |
Compared with MCP73831-2ADI/MC, the MCP73831-4ADI/MC enables higher energy density batteries via its 4.50 V regulation, while BQ24072RGTR trades precision CV flexibility for integrated power-path management - making MCP73831-4ADI/MC optimal for cost-sensitive, thermally constrained 4.50 V Li-ion designs.
Availability
MCP73831-4ADI/MC is available at Aetrix Electronics and suitable for USB chargers, wearable health monitors, Bluetooth audio accessories, and smart home sensors requiring stable component supply across production lifecycles.
Supply support for MCP73831-4ADI/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 family was designed specifically for cost-sensitive, space-limited portable electronics requiring fully integrated, single-resistor-programmable Li-ion/Li-Po charging - eliminating external pass devices and complex control logic.
FAQ
What is the exact constant-voltage regulation value for MCP73831-4ADI/MC?
The MCP73831-4ADI/MC is factory-configured for 4.50 V constant-voltage regulation with a tolerance of ±0.75%, corresponding to the "-4" suffix in Microchip's product identification system. This value is trimmed during production and does not require external calibration. The MCP73831-4ADI/MC maintains this regulation across −40°C to +85°C ambient temperature and load currents up to 500 mA.
How is charge current programmed on MCP73831-4ADI/MC?
Charge current for MCP73831-4ADI/MC is set using a single external resistor (RPROG) connected between the PROG pin and VSS. The relationship is IREG = 1000 V / RPROG, where RPROG is in kΩ and IREG is in mA. For example, a 2.0 kΩ resistor yields ~500 mA, while a 10 kΩ resistor yields ~100 mA. RPROG must be between 2 kΩ and 67 kΩ for valid operation.
Does MCP73831-4ADI/MC support automatic recharge, and how is it triggered?
Yes, MCP73831-4ADI/MC supports automatic recharge. It triggers a new charge cycle when the battery voltage (VBAT) falls to 94.0–99.0% of the regulated voltage (VREG), depending on temperature and process variation. This threshold is factory-set and non-adjustable. During Charge Complete mode, the device continuously monitors VBAT and re-enters Fast Charge mode once the threshold is crossed - ensuring full capacity retention without host intervention.
What is the function of the STAT pin on MCP73831-4ADI/MC, and what are its output states?
The STAT pin on MCP73831-4ADI/MC is a tri-state logic output used for charge status indication. Its states are: LOW during Preconditioning, Constant-Current, and Constant-Voltage modes; HIGH during Charge Complete (Standby); and High-Impedance during Shutdown or No-Battery conditions. This allows direct LED driving (with current-limiting resistor) or microcontroller GPIO monitoring without external level-shifting or pull-up components.
Can MCP73831-4ADI/MC operate without a battery connected?
Yes, MCP73831-4ADI/MC safely operates with no battery present. It detects absence via VBAT pin sourcing 6 µA - if VBAT rises to VREG + 100 mV (typical), the device enters No-Battery state with STAT in High-Z and reverse discharge current <2 µA. Input supply (VDD) remains active but no charge current flows. This behavior prevents false triggering and enables robust system-level battery insertion detection.
MCP73831-4ADI/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tube
- 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)
MCP73831-4ADI/MC FAQ
1.How can I place an order for MCP73831-4ADI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73831-4ADI/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 MCP73831-4ADI/MC reliable?
The price and inventory of MCP73831-4ADI/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73831-4ADI/MC is usually 5 days.
3.What payment methods are accepted for MCP73831-4ADI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73831-4ADI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73831-4ADI/MC?
MCP73831-4ADI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73831-4ADI/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 MCP73831-4ADI/MC?
For technical support, including MCP73831-4ADI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73831-4ADI/MC requirements.
6.How does Aetrix verify that MCP73831-4ADI/MC is sourced from the original manufacturer or authorized distributors?
All MCP73831-4ADI/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 MCP73831-4ADI/MC meets industry standards.
7.What is the process for return or replacement of MCP73831-4ADI/MC?
All MCP73831-4ADI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP73831-4ADI/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 MCP73831-4ADI/MC part is unused and in its original packaging.
Return procedure for MCP73831-4ADI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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