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

Microchip Technology MCP73841-420I/UN

Name: MCP73841-420I/UN
Brand: Microchip Technology
SKU: MCP73841-420I/UN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73841-420I/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

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

Datasheet:: MCP73841-420I/UN.pdf

Description:: IC BATT CNTRL LI-ION 1CEL 10MSOP

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Product details

Overview

MCP73841-420I/UN from Microchip Technology is a linear lithium-ion battery charge management controller in 10-pin MSOP package, delivering ±0.5% voltage regulation accuracy at 4.2 V, programmable fast-charge current via external sense resistor, preconditioning for deeply depleted cells, and integrated thermistor-based temperature monitoring. It supports single-cell Li-ion/Li-polymer battery packs in space-constrained portable devices such as MP3 players and digital cameras.

For engineers reviewing the MCP73841-420I/UN datasheet, MCP73841-420I/UN pinout, MCP73841-420I/UN application, or MCP73841-420I/UN equivalent, key selection criteria include its 4.2 V fixed regulation voltage, -40°C to +85°C operating range, MSOP-10 thermal performance (θ_JA = 113°C/W), integrated safety timers, and direct LED-driven STAT1 status output.

Technical Context

The MCP73841-420I/UN implements a three-phase charge algorithm-preconditioning (trickle-charge at ~10% of I_REG), constant-current fast charge (regulated by V_FCS = 110 mV across R_SENSE), and constant-voltage regulation (4.2 V ±0.5%). It uses internal reference-based comparators for UVLO (V_START = 4.45 V), recharge threshold (V_RTH = V_REG − 200 mV), and charge termination (V_TCS = 7 mV).

Temperature supervision is implemented via THREF (2.55 V ±0.075 V) biasing an external NTC/PTC thermistor, with THERM input comparing against ratio-metric thresholds (V_THREF/2 and V_THREF/4). All safety timers-precondition (60 min), fast-charge (1.5 hr), and elapsed-time (3.0 hr)-are scaled by CTIMER/0.1 µF.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulation Voltage	4.2 V ±0.5% - ensures precise full-charge cutoff for graphite-anode Li-ion cells, minimizing overvoltage stress and cycle degradation.
Fast Charge Threshold	110 mV (V_FCS) - sets I_REG = 110 mV / R_SENSE; enables accurate, resistor-programmable charge current up to ~500 mA with 220 mΩ.
Precondition Threshold	2.85 V (V_PTH) - triggers safe trickle-charge below this battery voltage, protecting deeply discharged cells from thermal runaway.
UVLO Start Voltage	4.45 V - prevents operation until input supply exceeds minimum required headroom above 4.2 V regulation target.
Thermistor Reference	2.55 V ±0.075 V - stable bias for external thermistor network, enabling ratio-metric temperature sensing immune to VDD variation.
Operating Temp Range	-40°C to +85°C - fully specified industrial-grade operation, supporting deployment in consumer and embedded environments.
Package Thermal Resistance	113°C/W (θ_JA) - quantifies junction-to-ambient dissipation in standard 4-layer board layout, critical for thermal design margining.

Pinout & Package

Package: 10-pin MSOP (3.0 mm × 3.0 mm × 1.0 mm height), exposed pad optional for thermal enhancement. Pin numbering follows standard MSOP top-view orientation (pin 1 marked).

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	Input supply rail	4.5–12 V input; powers internal circuitry and enables UVLO (4.45 V start); bypass with ≥4.7 µF to VSS.
3 STAT1	Open-drain status output	Sinks up to 12 mA; drives LED directly (low = active charge); flashing indicates fault or temp violation.
4 EN	Logic enable input	High = enable charge; low = force termination and enter 0.25 µA sleep mode; TTL/CMOS compatible.
5 THREF	Thermistor bias reference	2.55 V output; supplies stable current to external thermistor divider; enables ratio-metric temperature measurement.
6 THERM	Thermistor voltage input	Compares against V_THREF/2 and V_THREF/4; applying 0.85 V disables temperature monitoring.
7 TIMER	Timer capacitor connection	CTIMER to VSS sets all safety timers: t_PRECON, t_FAST, t_TERM scale linearly with C_TIMER/0.1 µF.
8 VSS	Ground reference	0 V return for battery negative terminal and internal analog/digital circuits; must be low-impedance.
9 VBAT	Battery voltage sense	Direct connection to battery positive; internal precision divider regulates to 4.2 V; bypass ≥4.7 µF for stability.
10 DRV	P-MOSFET gate driver	Sinks 2 mA (CV mode); sources -0.5 mA; drives external P-channel pass transistor in linear region.

Key Features

Feature	Design Value
±0.5% voltage regulation accuracy	Ensures consistent cell termination at 4.2 V across temperature and line/load variations, extending battery cycle life.
Integrated preconditioning with 2.85 V threshold	Enables safe recovery of cells discharged below 2.85 V using ~10% of fast-charge current, reducing thermal risk.
Dual-threshold thermistor monitoring (V_THREF/2 & V_THREF/4)	Provides robust cold/hot detection without external op-amps; immune to VDD ripple due to ratio-metric architecture.
Three independent safety timers	Prevents hazardous overcharge: precondition (60 min), fast-charge (1.5 hr), and elapsed-time (3.0 hr) timers all user-scalable via CTIMER.
STAT1 open-drain status with flash indication	Eliminates need for external driver; 1 Hz flash (with 0.1 µF CTIMER) signals faults like timer expiry or temperature violation.

Applications

MP3 Players	Digital Cameras
Use Scenario: Compact portable audio device with single-cell Li-ion battery requiring reliable, space-efficient charging under variable USB input conditions. IC Role / Device Role / Timing Role: Stand-alone linear charge controller managing full CC/CV profile, preconditioning, temperature supervision, and LED status indication. Use Value: Eliminates host MCU involvement; ±0.5% regulation preserves battery capacity; MSOP-10 footprint fits tight PCB layouts.	Use Scenario: High-current imaging device where battery must recharge quickly between bursts of flash and sensor operation without thermal runaway. IC Role / Device Role / Timing Role: Primary charge manager enforcing 4.2 V cutoff, fast-charge current limiting, and real-time cell temperature monitoring during high-power discharge cycles. Use Value: Prevents overtemperature shutdown during rapid recharge; 110 mV current-sense threshold enables accurate 500 mA+ charging with minimal sense resistor power loss.
Hand-Held Instruments	Cradle Chargers
Use Scenario: Battery-powered test equipment used intermittently in field environments with wide ambient temperature swings (-20°C to +60°C). IC Role / Device Role / Timing Role: Autonomous charger providing qualification, preconditioning, and CV termination while continuously validating cell temperature via THREF/THERM interface. Use Value: Full -40°C to +85°C specification ensures reliable startup and charge completion even after cold storage; ratio-metric thermistor sensing avoids calibration drift.	Use Scenario: Docking station that charges multiple devices simultaneously, requiring predictable charge timing and fault signaling to host system. IC Role / Device Role / Timing Role: Dedicated charge controller per battery slot, using STAT1 flash pattern to communicate fault type (e.g., timer expiry vs. thermal violation) to cradle MCU. Use Value: Standardized 1 Hz flash with 50% duty cycle simplifies host-side fault decoding; EN pin allows centralized charge enable/disable control.

MP3 Players

Digital Cameras

Use Scenario: Compact portable audio device with single-cell Li-ion battery requiring reliable, space-efficient charging under variable USB input conditions.

IC Role / Device Role / Timing Role: Stand-alone linear charge controller managing full CC/CV profile, preconditioning, temperature supervision, and LED status indication.

Use Value: Eliminates host MCU involvement; ±0.5% regulation preserves battery capacity; MSOP-10 footprint fits tight PCB layouts.

Use Scenario: High-current imaging device where battery must recharge quickly between bursts of flash and sensor operation without thermal runaway.

IC Role / Device Role / Timing Role: Primary charge manager enforcing 4.2 V cutoff, fast-charge current limiting, and real-time cell temperature monitoring during high-power discharge cycles.

Use Value: Prevents overtemperature shutdown during rapid recharge; 110 mV current-sense threshold enables accurate 500 mA+ charging with minimal sense resistor power loss.

Hand-Held Instruments

Cradle Chargers

Use Scenario: Battery-powered test equipment used intermittently in field environments with wide ambient temperature swings (-20°C to +60°C).

IC Role / Device Role / Timing Role: Autonomous charger providing qualification, preconditioning, and CV termination while continuously validating cell temperature via THREF/THERM interface.

Use Value: Full -40°C to +85°C specification ensures reliable startup and charge completion even after cold storage; ratio-metric thermistor sensing avoids calibration drift.

Use Scenario: Docking station that charges multiple devices simultaneously, requiring predictable charge timing and fault signaling to host system.

IC Role / Device Role / Timing Role: Dedicated charge controller per battery slot, using STAT1 flash pattern to communicate fault type (e.g., timer expiry vs. thermal violation) to cradle MCU.

Use Value: Standardized 1 Hz flash with 50% duty cycle simplifies host-side fault decoding; EN pin allows centralized charge enable/disable control.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP73831T-2ACI/OT	8-pin SOT-23; no temperature monitoring; 4.2 V regulation; integrated MOSFET not present - requires external pass device.	Targeted at ultra-low-cost, size-constrained applications where thermal supervision is omitted.	Select when board space is <2 mm² and temperature monitoring is unnecessary; verify external MOSFET thermal design.
BQ24075RGTR	16-pin QFN; integrated N-MOSFET; 4.2 V regulation; I²C programmability; no THREF/THERM pins.	Designed for host-controlled systems needing dynamic charge parameter adjustment and higher integration.	Select when system requires I²C configuration or integrated power FET; not drop-in due to different pinout, package, and control interface.

Compared with MCP73831T-2ACI/OT, the MCP73841-420I/UN adds thermistor-based temperature monitoring and uses MSOP-10 for better thermal handling; compared with BQ24075RGTR, it offers simpler standalone operation but lacks programmability and integrated FET - favoring cost-sensitive, fixed-parameter designs.

Availability

MCP73841-420I/UN is available at Aetrix Electronics and suitable for MP3 players, digital cameras, hand-held instruments, and cradle chargers requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature performance.

Supply support for MCP73841-420I/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 battery management ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The MCP7384X product line was designed specifically for cost-sensitive, space-limited portable electronics requiring fully autonomous, high-accuracy linear charging of single- or dual-cell Li-ion/Li-polymer batteries without host processor intervention.

FAQ

What is the exact voltage regulation accuracy of the MCP73841-420I/UN?

The MCP73841-420I/UN provides ±0.5% maximum voltage regulation accuracy at 4.2 V across -40°C to +85°C ambient temperature, as specified in DS21823D-page 3 under "Regulated Output Voltage" with VDD = [VREG(Typ)+1V] and IOUT = 10 mA. This tolerance ensures reliable full-charge termination for graphite-anode lithium-ion cells without overvoltage stress.

Does the MCP73841-420I/UN support temperature monitoring, and how is it implemented?

Yes, the MCP73841-420I/UN supports continuous cell temperature monitoring via dedicated THREF (pin 5) and THERM (pin 6) pins. THREF delivers a stable 2.55 V ±0.075 V reference to bias an external NTC or PTC thermistor network; THERM compares the resulting voltage against ratio-metric thresholds (V_THREF/2 and V_THREF/4), making the measurement immune to VDD fluctuations.

What are the safety timer periods for the MCP73841-420I/UN, and how are they configured?

The MCP73841-420I/UN features three safety timers: precondition (60 min), fast-charge (1.5 hr), and elapsed-time termination (3.0 hr), all scaled by CTIMER/0.1 µF. A 0.1 µF capacitor on TIMER (pin 7) to VSS yields nominal values; increasing CTIMER linearly extends all periods. Timer reset behavior is defined per phase transition - e.g., fast-charge timer resets upon entering constant-voltage mode.

Can the MCP73841-420I/UN operate with input voltages below 4.5 V?

No, the MCP73841-420I/UN requires a minimum VDD of 4.5 V to operate, as specified in DS21823D-page 3 under "Supply Voltage". Its UVLO start threshold is 4.45 V (typical), and operation below 4.5 V will cause the device to remain disabled or enter power-down mode, preventing regulation or charge initiation.

How does the STAT1 pin function on the MCP73841-420I/UN during normal and fault conditions?

The STAT1 pin on the MCP73841-420I/UN is an open-drain output sinking up to 12 mA. During active charging (precondition, CC, CV), it pulls low; at charge completion, it goes high-impedance (LED off). Fault conditions - including safety timer expiry or invalid THERM voltage - cause STAT1 to flash at ~1 Hz (50% duty cycle), enabling immediate visual fault identification without host MCU polling.

MCP73841-420I/UN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tube

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1

Current - Charging:: -

Programmable Features:: Timer

Fault Protection:: Over Temperature

Charge Current - Max:: -

Battery Pack Voltage:: 4.2V

Voltage - Supply (Max):: 12V

Interface:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MCP73841-420I/UN FAQ

1.How can I place an order for MCP73841-420I/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73841-420I/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 MCP73841-420I/UN reliable?

The price and inventory of MCP73841-420I/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73841-420I/UN is usually 5 days.

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MCP73841-420I/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73841-420I/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 MCP73841-420I/UN?

For technical support, including MCP73841-420I/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73841-420I/UN requirements.

6.How does Aetrix verify that MCP73841-420I/UN is sourced from the original manufacturer or authorized distributors?

All MCP73841-420I/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 MCP73841-420I/UN meets industry standards.

7.What is the process for return or replacement of MCP73841-420I/UN?

All MCP73841-420I/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73841-420I/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 MCP73841-420I/UN part is unused and in its original packaging.

Return procedure for MCP73841-420I/UN:

1.Submit a request within 90 days.

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

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