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

Microchip Technology MCP73842T-820I/UN

Name: MCP73842T-820I/UN
Brand: Microchip Technology
SKU: MCP73842T-820I/UN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73842T-820I/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP73842T-820I/UN.pdf

Description:: IC BAT CNTRL LI-ION 1-2CL 10MSOP

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Product details

Overview

MCP73842T-820I/UN from Microchip Technology is a linear lithium-ion battery charge management controller designed for dual-series-cell packs. It delivers 8.2V ±0.5% regulated output, supports programmable fast-charge current via external sense resistor, integrates thermistor-based temperature monitoring, and operates across -40°C to +85°C ambient. It enables compact, cost-sensitive portable chargers for medical handhelds and industrial battery packs.

For engineers reviewing the MCP73842T-820I/UN datasheet, MCP73842T-820I/UN pinout, MCP73842T-820I/UN application, or MCP73842T-820I/UN equivalent, key selection criteria include its 8.2V fixed regulation voltage, MSOP-10 package with integrated THREF/THERM pins for cell thermal safety, 1.5-hour fast-charge timer, preconditioning threshold at 5.6V, and compatibility with P-channel MOSFET gate drive.

Technical Context

The MCP73842T-820I/UN implements a three-phase charging algorithm-preconditioning (trickle-charge below 5.6V), constant-current fast charge (regulated by V_FCS = 110 mV across R_SENSE), and constant-voltage regulation at 8.2V-with automatic termination when charge current falls below ~7% of I_REG. It uses internal precision references (2.55V THREF, ±50 ppm/°C) and ratio-metric thermistor comparators (VT1 = 1.25V, VT2 = 0.62V) for robust temperature qualification.

All safety timers-including 60-minute preconditioning, 1.5-hour fast-charge, and 3.0-hour elapsed-time termination-are scaled by a single external 0.1 µF capacitor on the TIMER pin. The device enters power-down mode (<0.75 mA operating, <0.25 µA disabled) when VDD drops below 8.40V (UVLO stop), preventing battery drain during input loss.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulation Voltage	8.2V ±0.5% - precisely targets dual Li-ion/Li-Po series packs with graphite anodes; ensures safe full-charge without overvoltage stress.
Input Voltage Range	8.7V to 12V - requires minimum 8.7V supply to initiate charge; compatible with regulated 9–12V wall adapters or DC rails.
Fast-Charge Threshold	110 mV (V_FCS) - sets I_REG = 110 mV / R_SENSE; enables accurate, resistor-programmable charge current up to ~1 A with typical R_SENSE.
Precondition Threshold	5.60V (V_PTH, typ.) - triggers trickle-charge for deeply depleted dual-cell batteries; prevents damage from high-current start-up.
Thermistor Reference	2.55V ±0.075V - stable bias for NTC/PTC thermistors; enables ratio-metric temperature sensing immune to VDD variation.
Charge Termination	7 mV (V_TCS) - detects end-of-charge when V_DD–V_SENSE ≤ 7 mV; corresponds to ~7% of I_REG for reliable CV-phase cutoff.
Operating Temp	-40°C to +85°C - fully specified for industrial and extended-temperature embedded applications; junction max 150°C.

Pinout & Package

Package: 10-pin MSOP (3.0 mm × 3.0 mm × 1.0 mm body, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 SENSE	Current-sense input	Voltage drop across external R_SENSE sets fast-charge current; 110 mV threshold enables precise I_REG programming.
2 VDD	Power supply input	8.7–12V input; powers internal circuitry and enables UVLO (8.40–8.85V stop); bypass with ≥4.7 µF to VSS.
3 STAT1	Open-drain status output	Drives LED directly (sink up to 12 mA); indicates qualification (OFF), charging (ON), fault (1 Hz flash), or complete (OFF).
4 EN	Logic enable input	Active-high control: EN = high enables charge; EN = low forces termination and reduces ISS to 0.25 µA.
5 THREF	Thermistor reference	2.55V ±0.075V bias source for external thermistor divider; enables temperature prequalification and continuous monitoring.
6 THERM	Thermistor input	Compares divided thermistor voltage against V_THREF/2 (1.25V) and V_THREF/4 (0.62V); disables charge if out-of-range.
7 TIMER	Timer capacitor input	Connects to 0.1 µF capacitor to set all safety timers: t_PRECON = 60 min, t_FAST = 1.5 hr, t_TERM = 3.0 hr.
8 VSS	Ground reference	0V return for battery negative terminal and all internal analog/digital blocks; must be low-impedance connection.
9 VBAT	Battery voltage sense	Direct connection to battery positive; internal 1.2V reference and precision divider regulate output to exactly 8.2V.
10 DRV	P-MOSFET gate driver	Sinks up to 2 mA in CV mode; drives external P-channel pass transistor in linear region for precise current/voltage control.

Key Features

Feature	Design Value
±0.5% voltage regulation accuracy	Ensures dual-cell Li-ion packs reach full capacity without risking overvoltage degradation or safety shutdown.
Integrated thermistor interface (THREF + THERM)	Eliminates need for external reference or comparator ICs; supports both NTC and PTC thermistors with ratio-metric immunity to supply noise.
Programmable safety timers via single capacitor	Reduces BOM count and layout complexity: one 0.1 µF ceramic capacitor configures all three critical charge timers.
Automatic preconditioning below 5.6V	Protects deeply discharged dual-cell batteries by limiting initial current to ~10% of I_REG, minimizing heat and stress on cells and MOSFET.
Open-drain STAT1 with direct LED drive	Enables simple visual status indication without external driver transistors or current-limiting resistors in basic designs.

Applications

Medical Handheld Diagnostics	Industrial Portable Test Equipment
Use Scenario: Battery-powered ultrasound probe with dual 3.7V Li-ion cells requiring safe, autonomous charging during field deployment. IC Role / Device Role / Timing Role: MCP73842T-820I/UN acts as the primary linear charge controller, managing CC/CV profile, thermal qualification, and automatic recharge while interfacing with host MCU via STAT1. Use Value: Enables compact, fanless design with guaranteed 8.2V regulation accuracy and built-in cell temperature monitoring per IEC 62368-1 requirements.	Use Scenario: Ruggedized multimeter with hot-swappable dual-cell battery pack used in factory maintenance environments. IC Role / Device Role / Timing Role: MCP73842T-820I/UN provides stand-alone charge management with UVLO, preconditioning, and timer-based fault detection-no firmware required. Use Value: Eliminates risk of overcharging due to voltage drift; 60-minute precondition timer prevents damage from accidental deep discharge during storage.
Wireless Sensor Node Gateway	Emergency Response Communication Unit
Use Scenario: Solar-charged gateway aggregating LoRaWAN sensor data, using dual Li-ion cells for nighttime operation. IC Role / Device Role / Timing Role: MCP73842T-820I/UN regulates charge from variable-input solar harvester (via DC-DC stage), monitors battery temperature under varying ambient conditions, and signals status to host processor. Use Value: Ratio-metric thermistor sensing ensures reliable thermal protection even with ±10% solar rail variation; low 0.25 µA shutdown current preserves battery during extended idle periods.	Use Scenario: Portable satellite communicator used by first responders, requiring guaranteed charge readiness after prolonged storage in vehicles. IC Role / Device Role / Timing Role: MCP73842T-820I/UN manages dual-cell charging from vehicle USB or 12V accessory port, enforces strict thermal limits, and auto-recharges when voltage drops below 7.6V. Use Value: Recharge threshold (V_RTH = V_REG – 600 mV = 7.6V) prevents premature cycling while maintaining >90% state-of-charge; MSOP-10 footprint saves PCB area in space-constrained enclosure.

Medical Handheld Diagnostics

Industrial Portable Test Equipment

Use Scenario: Battery-powered ultrasound probe with dual 3.7V Li-ion cells requiring safe, autonomous charging during field deployment.

IC Role / Device Role / Timing Role: MCP73842T-820I/UN acts as the primary linear charge controller, managing CC/CV profile, thermal qualification, and automatic recharge while interfacing with host MCU via STAT1.

Use Value: Enables compact, fanless design with guaranteed 8.2V regulation accuracy and built-in cell temperature monitoring per IEC 62368-1 requirements.

Use Scenario: Ruggedized multimeter with hot-swappable dual-cell battery pack used in factory maintenance environments.

IC Role / Device Role / Timing Role: MCP73842T-820I/UN provides stand-alone charge management with UVLO, preconditioning, and timer-based fault detection-no firmware required.

Use Value: Eliminates risk of overcharging due to voltage drift; 60-minute precondition timer prevents damage from accidental deep discharge during storage.

Wireless Sensor Node Gateway

Emergency Response Communication Unit

Use Scenario: Solar-charged gateway aggregating LoRaWAN sensor data, using dual Li-ion cells for nighttime operation.

IC Role / Device Role / Timing Role: MCP73842T-820I/UN regulates charge from variable-input solar harvester (via DC-DC stage), monitors battery temperature under varying ambient conditions, and signals status to host processor.

Use Value: Ratio-metric thermistor sensing ensures reliable thermal protection even with ±10% solar rail variation; low 0.25 µA shutdown current preserves battery during extended idle periods.

Use Scenario: Portable satellite communicator used by first responders, requiring guaranteed charge readiness after prolonged storage in vehicles.

IC Role / Device Role / Timing Role: MCP73842T-820I/UN manages dual-cell charging from vehicle USB or 12V accessory port, enforces strict thermal limits, and auto-recharges when voltage drops below 7.6V.

Use Value: Recharge threshold (V_RTH = V_REG – 600 mV = 7.6V) prevents premature cycling while maintaining >90% state-of-charge; MSOP-10 footprint saves PCB area in space-constrained enclosure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-cell lithium-ion charge management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP73842-820I/MC	Same die, 3x3 mm DFN package (wettable flank); no THREF/THERM pins - lacks integrated temperature monitoring.	Requires external thermistor circuit; suitable only where thermal monitoring is omitted or handled externally.	Select only if board space demands DFN and temperature safety is managed elsewhere.
BQ24075RGTR	Single-cell 4.2V charger (not dual-cell); includes integrated FET; no THREF/THERM; different timer architecture.	Cannot replace MCP73842T-820I/UN in 8.2V dual-cell systems; incompatible regulation voltage and topology.	Not a functional alternative - use only for single-cell designs with integrated switcher requirements.

Compared with MCP73842-820I/MC and BQ24075RGTR, the MCP73842T-820I/UN uniquely combines 8.2V dual-cell regulation, integrated thermistor bias/reference, and MSOP-10 packaging - making it the only option among the three that delivers complete, self-contained, temperature-qualified dual-cell charging in a surface-mount IC.

Availability

MCP73842T-820I/UN is available at Aetrix Electronics and suitable for medical diagnostics, industrial test equipment, wireless gateways, and emergency communication devices requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MCP73842T-820I/UN 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 memory products, serving automotive, industrial, consumer, and communications markets with high-reliability silicon solutions.

The MCP7384X product line was engineered specifically for space-constrained, cost-sensitive linear battery charging applications-delivering full CC/CV control, thermal qualification, and safety timers in minimal footprint packages like MSOP-10.

FAQ

What is the exact regulation voltage of the MCP73842T-820I/UN and how is it achieved?

The MCP73842T-820I/UN provides a fixed 8.2V regulation voltage with ±0.5% accuracy over -40°C to +85°C. This is achieved using an internal precision 1.2V bandgap reference and a trimmed resistor divider network connected to the VBAT pin. The device continuously compares the divided VBAT signal to the reference and adjusts the DRV output to maintain exactly 8.2V at the battery terminals under load.

Does the MCP73842T-820I/UN support temperature monitoring, and if so, how is it implemented?

Yes, the MCP73842T-820I/UN supports continuous cell temperature monitoring via dedicated THREF and THERM pins. THREF supplies a stable 2.55V reference to bias an external thermistor divider; THERM reads the resulting voltage and compares it against ratio-metric thresholds (V_THREF/2 = 1.25V and V_THREF/4 = 0.62V). If the voltage falls outside this window, charging suspends automatically - a core safety feature confirmed in the DS21823D datasheet.

What is the input voltage range required for the MCP73842T-820I/UN to operate correctly?

The MCP73842T-820I/UN requires an input supply (VDD) between 8.7V and 12V. Operation below 8.7V prevents startup due to UVLO activation (V_START = 8.45–8.90V); above 12V exceeds absolute maximum rating (13.5V). This range ensures sufficient headroom for the 8.2V regulation while accommodating typical 9V–12V wall adapters and DC power supplies used with dual-cell battery systems.

How does the MCP73842T-820I/UN handle deeply discharged batteries?

The MCP73842T-820I/UN initiates preconditioning when VBAT falls below 5.60V (typical V_PTH). During this phase, it delivers a reduced "trickle" current (~10% of fast-charge current) to safely recover deeply depleted dual-cell Li-ion packs. If VBAT does not exceed V_PTH before the 60-minute precondition timer expires, the device halts charging and flashes STAT1 - preventing unsafe high-current injection into damaged or shorted cells.

Can the MCP73842T-820I/UN be used without an external MOSFET?

No - the MCP73842T-820I/UN is a controller-only IC and requires an external P-channel MOSFET connected to the DRV pin. It does not integrate any power switching elements. The DRV output sinks up to 2 mA to drive the MOSFET gate in linear mode, enabling precise current and voltage regulation. Omitting the MOSFET renders the MCP73842T-820I/UN nonfunctional for battery charging.

MCP73842T-820I/UN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1 ~ 2

Current - Charging:: -

Programmable Features:: Timer

Fault Protection:: Over Temperature

Charge Current - Max:: -

Battery Pack Voltage:: 8.2V

Voltage - Supply (Max):: 12V

Interface:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MCP73842T-820I/UN FAQ

1.How can I place an order for MCP73842T-820I/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73842T-820I/UN 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 MCP73842T-820I/UN reliable?

The price and inventory of MCP73842T-820I/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73842T-820I/UN is usually 5 days.

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Once your MCP73842T-820I/UN 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 MCP73842T-820I/UN?

For technical support, including MCP73842T-820I/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73842T-820I/UN requirements.

6.How does Aetrix verify that MCP73842T-820I/UN is sourced from the original manufacturer or authorized distributors?

All MCP73842T-820I/UN 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 MCP73842T-820I/UN meets industry standards.

7.What is the process for return or replacement of MCP73842T-820I/UN?

All MCP73842T-820I/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73842T-820I/UN, 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 MCP73842T-820I/UN part is unused and in its original packaging.

Return procedure for MCP73842T-820I/UN:

1.Submit a request within 90 days.

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

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