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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Microchip Technology MCP73831T-5ACI/MC

Name: MCP73831T-5ACI/MC
Brand: Microchip Technology
SKU: MCP73831T-5ACI/MC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73831T-5ACI/MC

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 8-VFDFN Exposed Pad

Datasheet:: MCP73831T-5ACI/MC.pdf

Description:: IC BATT CONTRL LI-ION 1CELL 8DFN

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Product details

Overview

MCP73831T-5ACI/MC from Microchip Technology is a fully integrated linear lithium-ion/polymer battery charge management controller in a 5-lead SOT-23 package. It delivers precise 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-compliant charging in space-constrained portable devices.

For engineers reviewing the MCP73831T-5ACI/MC datasheet, MCP73831T-5ACI/MC pinout, MCP73831T-5ACI/MC application, or MCP73831T-5ACI/MC equivalent, this device supports critical design decisions for single-cell Li-ion charging circuits requiring thermal regulation, preconditioning control, end-of-charge status indication, and automatic recharge functionality.

Technical Context

The MCP73831T-5ACI/MC implements a three-phase linear charge algorithm: preconditioning (trickle charge at 10%/20%/40% of I_REG), constant-current fast charge, and constant-voltage regulation. Its internal P-channel MOSFET pass transistor features 350 mΩ typical R_DS(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) with 3.45 V start threshold and 70 mV hysteresis, battery presence detection via 6 µA VBAT sourcing, and tri-state STAT output for LED or microcontroller status signaling. The device operates across –40°C to +85°C ambient and supports automatic power-down when VDD falls below VBAT + 50 mV.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulated Voltage	4.50 V ±0.75% - factory-set for high-capacity Li-ion/Li-polymer cells requiring elevated termination voltage.
Max Charge Current	500 mA - achieved with 2.0 kΩ PROG-to-VSS resistor; enables full 1C charging for 500 mAh batteries.
Preconditioning Ratio	10% - fixed ratio of fast-charge current; initiates safe trickle charge below V_PTH = 66.5% × V_REG.
End-of-Charge Threshold	5% - fixed I_TERM/I_REG ratio; terminates CV phase when average current drops to 25 mA (at 500 mA I_REG).
Operating Temp Range	–40°C to +85°C - fully specified over industrial temperature range; junction limited to +125°C.
Package	SOT-23-5 - surface-mount, low-profile (1.45 mm max height), with exposed pad connected to VSS for thermal relief.
STAT Output Type	Tri-state logic - drives LED directly or interfaces with MCU GPIO; HIGH = charge complete, LOW = active charging, Hi-Z = shutdown/no battery.

Pinout & Package

Package: 5-Lead SOT-23 (JEDEC MO-178AA), 2.9 mm × 1.6 mm × 1.45 mm, with exposed thermal pad electrically tied to VSS.

Pin	Circuit Role	Design Meaning
1 (STAT)	Charge Status Output	Tri-state digital output indicating charge state; sinks up to 25 mA when LOW, sources up to 35 mA when HIGH, high-impedance in shutdown or no-battery condition.
2 (VSS)	Battery/Supply Ground Reference	Common 0 V return for battery negative, input supply, and PROG resistor; must connect to exposed thermal pad.
3 (VBAT)	Battery Charge Control Output	Drain of internal P-MOSFET; connects directly to battery positive terminal; bypassed with ≥4.7 µF ceramic capacitor for loop stability.
4 (VDD)	Battery Management Input Supply	Input voltage range 3.75–6 V; powers internal circuitry and supplies energy to battery; requires ≥4.7 µF bypass capacitor to VSS.
5 (PROG)	Current Regulation Set / Enable	Analog input setting fast-charge current (I_REG = 1000 V / R_PROG); floating or >70 kΩ disables charging and reduces quiescent current to 25 µA.

Key Features

Feature	Design Value
Integrated Pass Transistor	P-channel MOSFET with 350 mΩ R_DS(ON) at 105°C eliminates external switch and reduces BOM count.
Reverse Discharge Protection	Blocks battery-to-VDD current flow during input removal; limits reverse leakage to ≤2 µA in all shutdown conditions.
Thermal Regulation	Dynamically scales charge current above ~105°C junction temperature to maintain reliability without interrupting charge cycle.
USB-Compliant Operation	Fully adheres to USB power bus specifications including inrush current limiting and voltage tolerance (3.75–6 V input).
Automatic Recharge	Resumes charging when battery voltage drops to 94.0% of V_REG; prevents deep discharge while minimizing system intervention.

Applications

USB-Powered Portable Devices	Wearable Health Monitors
Use Scenario: Charging compact Bluetooth earbuds or smartwatches from standard USB ports with strict thermal and size constraints. IC Role / Device Role / Timing Role: Standalone linear charger managing full CC/CV algorithm, battery detection, and STAT-driven LED status without host MCU involvement. Use Value: Enables <5 mm² PCB footprint, eliminates need for external MOSFET or sense resistor, and ensures safe 4.50 V termination for high-energy-density Li-polymer cells.	Use Scenario: Powering continuous-sensing ECG or SpO₂ patches with small-form-factor rechargeable batteries. IC Role / Device Role / Timing Role: Single-chip battery manager providing preconditioning for deeply discharged cells, thermal-aware current scaling, and automatic top-off recharge. Use Value: Extends usable battery life per charge by supporting 4.50 V chemistry, reduces risk of overvoltage damage via ±0.75% regulation accuracy, and maintains operation down to –40°C ambient.
Industrial Handheld Scanners	Wireless Sensor Nodes
Use Scenario: Recharging ruggedized barcode scanners used in warehouse environments with frequent hot-plug USB connections. IC Role / Device Role / Timing Role: Robust charge controller with UVLO hysteresis (70 mV), IOVP-ready input stage, and reverse discharge blocking during cable disconnect events. Use Value: Prevents battery drain during intermittent USB connection, withstands transient surges via integrated protection, and sustains reliable operation across –40°C to +85°C industrial temperature range.	Use Scenario: Enabling multi-year battery life in LoRaWAN or NB-IoT nodes powered by coin-cell-sized Li-ion packs. IC Role / Device Role / Timing Role: Ultra-low-quiescent charger (25 µA in disabled state) with programmable 5% charge termination and high-impedance STAT for MCU wake-up signaling. Use Value: Minimizes standby power loss, supports precise end-of-charge detection to avoid overcharge stress, and allows host MCU to monitor charge status without dedicated ADC or GPIO overhead.

USB-Powered Portable Devices

Wearable Health Monitors

Use Scenario: Charging compact Bluetooth earbuds or smartwatches from standard USB ports with strict thermal and size constraints.

IC Role / Device Role / Timing Role: Standalone linear charger managing full CC/CV algorithm, battery detection, and STAT-driven LED status without host MCU involvement.

Use Value: Enables <5 mm² PCB footprint, eliminates need for external MOSFET or sense resistor, and ensures safe 4.50 V termination for high-energy-density Li-polymer cells.

Use Scenario: Powering continuous-sensing ECG or SpO₂ patches with small-form-factor rechargeable batteries.

IC Role / Device Role / Timing Role: Single-chip battery manager providing preconditioning for deeply discharged cells, thermal-aware current scaling, and automatic top-off recharge.

Use Value: Extends usable battery life per charge by supporting 4.50 V chemistry, reduces risk of overvoltage damage via ±0.75% regulation accuracy, and maintains operation down to –40°C ambient.

Industrial Handheld Scanners

Wireless Sensor Nodes

Use Scenario: Recharging ruggedized barcode scanners used in warehouse environments with frequent hot-plug USB connections.

IC Role / Device Role / Timing Role: Robust charge controller with UVLO hysteresis (70 mV), IOVP-ready input stage, and reverse discharge blocking during cable disconnect events.

Use Value: Prevents battery drain during intermittent USB connection, withstands transient surges via integrated protection, and sustains reliable operation across –40°C to +85°C industrial temperature range.

Use Scenario: Enabling multi-year battery life in LoRaWAN or NB-IoT nodes powered by coin-cell-sized Li-ion packs.

IC Role / Device Role / Timing Role: Ultra-low-quiescent charger (25 µA in disabled state) with programmable 5% charge termination and high-impedance STAT for MCU wake-up signaling.

Use Value: Minimizes standby power loss, supports precise end-of-charge detection to avoid overcharge stress, and allows host MCU to monitor charge status without dedicated ADC or GPIO overhead.

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-2ACI/MC	Fixed 4.20 V regulation (±0.75%), same SOT-23-5 package and pinout.	Designed for standard Li-ion cells; lacks support for higher-voltage Li-polymer chemistries.	Select when using conventional 4.2 V nominal cells and cost-sensitive designs require identical layout.
BQ24075RGTR	TI part with 4.2 V default, integrated LDO, and different STAT logic (active-low open-drain); requires external resistor for current set.	Includes integrated 3.3 V/200 mA LDO for system rail; STAT behavior differs (no HIGH state - only LOW/Hi-Z).	Choose when dual-rail power (battery + regulated system supply) is required and board space permits minor layout revision.

Compared with MCP73831T-2ACI/MC, the MCP73831T-5ACI/MC enables higher cell voltage compliance (4.50 V vs. 4.20 V), extending usable capacity in next-gen Li-polymer batteries; versus BQ24075RGTR, it offers simpler integration (no LDO overhead), tighter voltage tolerance, and tri-state STAT for direct LED drive without pull-up.

Availability

MCP73831T-5ACI/MC is available at Aetrix Electronics and suitable for USB-powered portable devices, wearable health monitors, industrial handheld scanners, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MCP73831T-5ACI/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, serving automotive, industrial, and consumer markets with high-reliability silicon and comprehensive design tools.

The MCP7383x family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer charging applications - emphasizing minimal external components, thermal resilience, and USB compliance without host processor dependency.

FAQ

What is the exact regulated output voltage of the MCP73831T-5ACI/MC?

The MCP73831T-5ACI/MC provides a factory-set constant-voltage regulation of 4.50 V with a tolerance of ±0.75%, meaning the actual output falls between 4.466 V and 4.534 V under specified operating conditions. This value is confirmed in the Electrical Characteristics table (DS20001984H, page 3) and applies across –40°C to +85°C ambient temperature with VDD = [VREG(typical) + 1.0 V] to 6 V.

How do I set the fast-charge current for the MCP73831T-5ACI/MC?

You set the fast-charge current for the MCP73831T-5ACI/MC by connecting a resistor (R_PROG) between the PROG pin and VSS. The relationship is I_REG = 1000 V / R_PROG, where R_PROG is in kΩ and I_REG is in mA. For example, a 2.0 kΩ resistor yields 500 mA. The MCP73831T-5ACI/MC supports 15–500 mA via R_PROG values from 67 kΩ to 2.0 kΩ, as verified in the DC Characteristics table on page 3 of DS20001984H.

Does the MCP73831T-5ACI/MC support automatic recharge, and at what threshold?

Yes, the MCP73831T-5ACI/MC supports automatic recharge. It resumes charging when the battery voltage drops to 94.0% of the regulated voltage (V_RTH/V_REG = 94.0%), which equals 4.23 V for the 4.50 V variant. This threshold has a ±2.5% tolerance (91.5%–96.5%) and is specified in the Electrical Characteristics table (page 4, "Recharge Voltage Threshold Ratio") of DS20001984H.

What is the function of the STAT pin on the MCP73831T-5ACI/MC, and how does it behave?

The STAT pin on the MCP73831T-5ACI/MC is a tri-state logic output used for charge status indication. It outputs LOW during preconditioning, constant-current, and constant-voltage phases; HIGH during charge-complete/standby; and high-impedance during shutdown or no-battery conditions. This behavior is documented in Table 5-1 (page 15) and Section 5.2.1 of DS20001984H, confirming compatibility with both LED drivers and MCU GPIO inputs.

Can the MCP73831T-5ACI/MC operate without a battery connected?

Yes, the MCP73831T-5ACI/MC can operate without a battery connected. It detects absence via VBAT sourcing - if VBAT rises to V_REG + 100 mV (≈4.60 V), the device enters no-battery mode, disables charging, and places STAT in high-impedance. Reverse discharge current remains ≤2 µA, and quiescent supply current drops to 25 µA. This behavior is explicitly defined in Section 4.2 ("Battery Detection") and Table 1-1 (page 3) of DS20001984H.

MCP73831T-5ACI/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:: 4.5V

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-5ACI/MC FAQ

1.How can I place an order for MCP73831T-5ACI/MC through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73831T-5ACI/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-5ACI/MC reliable?

The price and inventory of MCP73831T-5ACI/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-5ACI/MC is usually 5 days.

3.What payment methods are accepted for MCP73831T-5ACI/MC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73831T-5ACI/MC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCP73831T-5ACI/MC?

MCP73831T-5ACI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73831T-5ACI/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-5ACI/MC?

For technical support, including MCP73831T-5ACI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73831T-5ACI/MC requirements.

6.How does Aetrix verify that MCP73831T-5ACI/MC is sourced from the original manufacturer or authorized distributors?

All MCP73831T-5ACI/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-5ACI/MC meets industry standards.

7.What is the process for return or replacement of MCP73831T-5ACI/MC?

All MCP73831T-5ACI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP73831T-5ACI/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-5ACI/MC part is unused and in its original packaging.

Return procedure for MCP73831T-5ACI/MC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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