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Microchip Technology MCP73831-2DCI/MC
- Part No.:
- MCP73831-2DCI/MC
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP73831-2DCI/MC.pdf
- Description:
- IC BATT CONTRL LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:460
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Product details
Overview
MCP73831-2DCI/MC from Microchip Technology is a miniature, fully integrated linear lithium-ion/lithium-polymer battery charge management controller in an 8-lead 2 mm × 3 mm DFN package with exposed thermal pad. It delivers ±0.75% voltage regulation at 4.20 V, supports programmable charge current from 15 mA to 500 mA via single external resistor, includes reverse discharge protection and thermal regulation, and is optimized for USB-powered portable devices.
For engineers reviewing the MCP73831-2DCI/MC datasheet, MCP73831-2DCI/MC pinout, MCP73831-2DCI/MC application, or MCP73831-2DCI/MC equivalent, key selection considerations include its fixed 4.20 V regulation accuracy, tri-state STAT output, DFN thermal performance (θJA = 76°C/W), preconditioning and termination ratio options, and compatibility with space-constrained Li-ion charging designs requiring no external pass transistor.
Technical Context
The MCP73831-2DCI/MC implements a constant-current/constant-voltage (CC/CV) charge algorithm with factory-set 4.20 V regulation (±0.75%), selectable preconditioning thresholds (64–74% of VREG), and termination ratios (3.75–25% of IREG). Its internal P-channel MOSFET pass transistor features 350 mΩ typical RDS(on) at 105°C and integrates current sense, UVLO (3.45 V start, 3.38 V stop), and automatic power-down when VDD < VBAT + 50 mV.
Thermal regulation begins before junction temperature reaches 150°C shutdown threshold, dynamically reducing charge current to maintain reliability under high ambient or high-power conditions. The device operates across –40°C to +85°C ambient, supports battery detection via 6 µA VBAT current source, and provides tri-state STAT output for LED or microcontroller status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulated Voltage | 4.20 V ±0.75% - Ensures precise full-charge termination for standard Li-ion cells without external feedback. |
| Charge Current Range | 15 mA to 500 mA - Set by single PROG-to-VSS resistor; enables optimization for battery capacity (e.g., 1C rate for 500 mAh cell). |
| Preconditioning Threshold | 66.5% of VREG (typ.) - Triggers trickle charge below ~2.79 V for deeply discharged batteries, preventing damage. |
| Termination Ratio | 5% of IREG (default) - Ends fast charge when current drops to 5% of programmed value, ensuring safe CV-phase completion. |
| Thermal Regulation Start | Active before 150°C - Dynamically scales down ICHG to prevent thermal runaway while maintaining fastest possible cycle time. |
| UVLO Threshold | 3.45 V (start), 3.38 V (stop), 70 mV hysteresis - Prevents operation below safe input voltage and avoids oscillation near cutoff. |
| STAT Output Type | Tri-state logic - Supports direct LED drive (low = charging, high = complete) or microcontroller polling (high-Z = shutdown/no battery). |
Pinout & Package
Package: 8-Lead, 2 mm × 3 mm DFN 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, 2 (VDD) | Battery management input supply | Dual VDD pins reduce trace resistance; bypass with ≥4.7 µF capacitor to VSS for stability and noise immunity. |
| 3, 4 (VBAT) | Battery charge control output | Drain of internal P-MOSFET; connects directly to battery anode; requires ≥4.7 µF output capacitor for loop stability. |
| 5 (STAT) | Charge status output | Tri-state logic signal: LOW = active charge, HIGH = charge complete, High-Z = shutdown or no battery. |
| 6 (VSS) | Battery management 0V reference | Common return for VDD, VBAT, PROG, and EP; must be low-impedance connection to system ground. |
| 7 (NC) | No connection | Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling or latch-up risk. |
| 8 (PROG) | Current regulation set and enable | Resistor to VSS sets ICHG; floating disables device (IQ ≤ 25 µA) and blocks reverse discharge. |
| 9 (EP) | Exposed thermal pad | Internally tied to VSS; requires multiple thermal vias to inner ground plane for θJA = 76°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pass transistor | Eliminates need for external MOSFET and gate driver, reducing BOM count and PCB area in compact USB chargers. |
| Reverse discharge protection | Blocks battery-to-VDD current flow when input is absent, limiting standby drain to <2 µA during UVLO or PROG-float disable. |
| Four factory-set VREG options | 4.20 V variant (MCP73831-2) supports legacy Li-ion cells; eliminates external voltage divider or DAC for accurate termination. |
| Programmable preconditioning | Enables safe recovery of over-discharged cells by applying controlled 10%/20%/40% trickle current before fast charge. |
| Automatic recharge threshold | Reinitiates charge when battery voltage drops to 94% of VREG, maintaining full capacity without host intervention. |
| Thermal regulation with hysteresis | Smoothly throttles current above ~125°C and resumes full current only after ~10°C cooldown, avoiding thermal cycling stress. |
Applications
| USB-Powered Portable Charger | Wearable Health Monitor |
|---|---|
Use Scenario: Compact wearable with 200–400 mAh Li-Po battery charged via micro-USB port compliant with USB 2.0 500 mA limit. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, battery detection, and STAT-driven LED status without MCU involvement. Use Value: Enables single-resistor current programming (e.g., 330 Ω → 300 mA), ±0.75% VREG ensures cell longevity, and DFN package fits sub-100 mm² PCB area. |
Use Scenario: Continuous-sensing ECG patch requiring ultra-low quiescent current during sleep and reliable top-off between usage cycles. IC Role / Device Role / Timing Role: Primary charge manager providing automatic recharge at 94% VREG, reverse discharge blocking, and thermal-aware current scaling during active sensing. Use Value: 25 µA shutdown current extends shelf life; tri-state STAT allows host MCU to detect charge state without pull-ups; DFN thermal pad sustains 350 mA charge in confined enclosure. |
| Bluetooth Headset Charging Case | IoT Sensor Node |
Use Scenario: Dual-bay charging case with independent 150 mAh Li-ion cells per earbud, powered by 5 V wall adapter. IC Role / Device Role / Timing Role: Dual-channel charge control using two MCP73831-2DCI/MC ICs, each managing one cell with discrete PROG resistors and STAT outputs. Use Value: Eliminates need for dual-MOSFET discrete solution; 4.20 V regulation matches standard headset battery spec; NC pin simplifies layout routing in tight 2-layer board. |
Use Scenario: Solar-harvested environmental sensor node with 800 mAh Li-ion backup, operating in industrial outdoor temperatures (–40°C to +85°C). IC Role / Device Role / Timing Role: Primary charge controller handling variable input (4.5–6 V), battery detection, and thermal regulation during peak solar input. Use Value: Full –40°C to +85°C specification ensures reliability; UVLO hysteresis prevents false restarts during cloudy intervals; 76°C/W θJA enables 450 mA charge even with minimal copper area. |
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 |
|---|---|---|---|
| TP4056 | Fixed 4.2 V regulation (±1.0%), no factory-selectable VREG variants; open-drain STAT; no preconditioning option. | Lacks programmable preconditioning and automatic recharge; less suitable for deeply discharged or maintenance-critical cells. | Choose TP4056 only if lowest BOM cost is primary goal and 4.2 V tolerance ±1.0% is acceptable for your cell vendor's spec. |
| MCP73832-2DCI/MC | Identical electrical specs and pinout, but open-drain STAT output instead of tri-state; same DFN package and 4.20 V regulation. | Requires external pull-up for MCU interface; incompatible with direct LED anode drive without series resistor. | Select MCP73832-2DCI/MC only when interfacing to a microcontroller GPIO with internal or external pull-up; otherwise MCP73831-2DCI/MC offers greater flexibility. |
Compared with TP4056 and MCP73832-2DCI/MC, the MCP73831-2DCI/MC provides superior system-level integration through its tri-state STAT, factory-optimized preconditioning, and tighter 0.75% voltage regulation-enabling longer battery cycle life and eliminating external components required by alternatives.
Availability
MCP73831-2DCI/MC is available at Aetrix Electronics and suitable for USB-powered portable chargers, wearable health monitors, and Bluetooth headset charging cases requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP73831-2DCI/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, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP73831/2 product line was designed specifically for cost-sensitive, space-constrained Li-ion/Li-Po charging applications where integration, thermal efficiency, and USB compliance are critical-enabling rapid deployment of single-cell battery systems without external power FETs or complex control firmware.
FAQ
What is the exact regulated output voltage of the MCP73831-2DCI/MC?
The MCP73831-2DCI/MC is factory-configured for 4.20 V constant-voltage regulation with a tolerance of ±0.75%, meaning the actual VREG falls between 4.168 V and 4.232 V at +25°C and remains within this band across –40°C to +85°C ambient. This precision eliminates need for external calibration and ensures safe, repeatable full-charge termination for standard Li-ion cells.
How does the MCP73831-2DCI/MC implement thermal regulation?
The MCP73831-2DCI/MC continuously monitors die temperature and begins reducing charge current before reaching 150°C shutdown. As junction temperature rises, it smoothly scales back ICHG to maintain reliability-evident in Figure 2-9 and Figure 4-2 of the datasheet-while preserving fastest possible charge time under real-world thermal constraints.
What is the function of the NC pin on the MCP73831-2DCI/MC DFN package?
Pin 7 on the MCP73831-2DCI/MC DFN package is designated NC (No Connection) and corresponds to an unbonded die pad. It must remain unconnected on the PCB to prevent unintended coupling, noise injection, or potential latch-up. Routing traces or placing vias to this pin violates Microchip's layout guidance and may impair device stability.
Can the MCP73831-2DCI/MC operate without a battery connected?
Yes-the MCP73831-2DCI/MC detects absence of a battery via its 6 µA VBAT current source: if VBAT rises to VREG + 100 mV (≈4.3 V), it enters No-Battery-Present mode with STAT in high-impedance state and reverse discharge current limited to <2 µA, enabling safe standby operation in docked or unpowered states.
What is the recommended minimum PROG resistor value for the MCP73831-2DCI/MC?
The minimum recommended PROG resistor is 2.0 kΩ, which programs a nominal fast-charge current of 505 mA (typical). Using lower values risks exceeding the device's internal current-sense amplifier range and may cause inaccurate regulation or thermal overload; Microchip specifies RPROG between 2 kΩ and 67 kΩ for guaranteed operation.
MCP73831-2DCI/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:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
MCP73831-2DCI/MC FAQ
1.How can I place an order for MCP73831-2DCI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73831-2DCI/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 MCP73831-2DCI/MC reliable?
The price and inventory of MCP73831-2DCI/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73831-2DCI/MC is usually 5 days.
3.What payment methods are accepted for MCP73831-2DCI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73831-2DCI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73831-2DCI/MC?
MCP73831-2DCI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73831-2DCI/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 MCP73831-2DCI/MC?
For technical support, including MCP73831-2DCI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73831-2DCI/MC requirements.
6.How does Aetrix verify that MCP73831-2DCI/MC is sourced from the original manufacturer or authorized distributors?
All MCP73831-2DCI/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 MCP73831-2DCI/MC meets industry standards.
7.What is the process for return or replacement of MCP73831-2DCI/MC?
All MCP73831-2DCI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP73831-2DCI/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 MCP73831-2DCI/MC part is unused and in its original packaging.
Return procedure for MCP73831-2DCI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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