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Microchip Technology MCP73842-840I/UN
- Part No.:
- MCP73842-840I/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73842-840I/UN.pdf
- Description:
- IC BAT CNTRL LI-ION 1-2CL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,293
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Product details
Overview
MCP73842-840I/UN from Microchip Technology is a linear lithium-ion/polymer battery charge management controller designed for dual-series-cell packs. It delivers 8.4V ±0.5% voltage regulation, supports programmable fast-charge current via external sense resistor, includes preconditioning for deeply depleted cells, automatic end-of-charge termination at ~7% IREG, and continuous thermistor-based temperature monitoring. It is used in portable medical devices requiring safe, autonomous dual-cell charging.
For engineers reviewing the MCP73842-840I/UN datasheet, MCP73842-840I/UN pinout, MCP73842-840I/UN application, or MCP73842-840I/UN equivalent, key selection criteria include its 8.4V fixed regulation, MSOP-10 package with integrated THERM/THREF temperature interface, -40°C to +85°C operating range, and compatibility with P-channel MOSFET gate drive for high-side linear regulation.
Technical Context
The MCP73842-840I/UN implements a three-phase charge algorithm: qualification (UVLO, EN, temperature), preconditioning (trickle-charge below 5.7V), constant-current fast charge (regulated by VFCS = 110 mV across RSENSE), then constant-voltage regulation at 8.4V. All safety timers - precondition (60 min), fast-charge (1.5 hr), and elapsed-time termination (3.0 hr) - scale linearly with CTIMER.
It integrates analog comparators for VREG, VPTH (5.7V), VRTH (VREG − 400 mV), and thermistor thresholds (VTHREF/2 and VTHREF/4), plus bias generation for 2.55V THREF output with ±50 ppm/°C drift. The DRV output sinks up to 2 mA in CV mode to control external P-MOSFET gate voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 8.4V ±0.5% max - ensures precise dual-cell Li-ion termination without overvoltage stress |
| Input Voltage Range | 8.7V to 12V - matches wall adapters for 2S battery systems |
| Charge Current Sense | 110 mV threshold - sets fast-charge current via RSENSE = 110 mV / IREG |
| Precondition Threshold | 5.7V typical - initiates safe trickle-charge for cells below safe CV entry |
| Thermistor Reference | 2.55V ±0.075V - enables ratiometric NTC/PTC temperature sensing independent of VDD |
| Operating Temperature | -40°C to +85°C - qualified for industrial and portable medical environments |
| Package | MSOP-10 - compact footprint with dedicated THERM/THREF pins for thermal safety |
Pinout & Package
Package: 10-pin MSOP (3.0 mm × 3.0 mm × 1.0 mm height), moisture sensitivity level 1, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE | Current sense input | Voltage drop across external RSENSE sets fast-charge current (110 mV target) |
| 2 VDD | Supply input | 8.7–12V input; powers IC and enables UVLO (8.45–8.90V start) |
| 3 STAT1 | Status output | Open-drain, current-limited - drives LED directly or interfaces to MCU GPIO |
| 4 EN | Enable control | Logic-high enables charge; low forces termination and reduces ISS to 0.25 µA |
| 5 THREF | Thermistor bias reference | 2.55V output for ratiometric NTC/PTC biasing; immune to VDD variation |
| 6 THERM | Temperature sensor input | Compares to VTHREF/2 and VTHREF/4 - disables charge if out-of-range |
| 7 TIMER | Safety timer capacitor | 0.1 µF sets tPRECON = 60 min, tFAST = 1.5 hr, tTERM = 3.0 hr |
| 8 VSS | Ground reference | 0V return for battery negative terminal and internal analog/digital circuits |
| 9 VBAT | Battery voltage sense | Direct connection to 2S pack (+) terminal; internal divider regulates to 8.4V |
| 10 DRV | P-MOSFET gate driver | Sinks 2 mA in CV mode - controls external high-side pass transistor |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% voltage regulation accuracy | Minimizes cell stress and extends cycle life in dual-series Li-ion packs |
| Dedicated THREF/THERM interface | Enables fail-safe, supply-independent temperature monitoring per JEITA guidelines |
| Programmable safety timers | Prevents thermal runaway by terminating charge if preconditioning, fast-charge, or CV phases exceed time limits |
| Automatic recharge at VRTH = VREG − 400 mV | Maintains full capacity without manual intervention while avoiding overcharge |
| Preconditioning below 5.7V | Restores deeply discharged 2S cells safely before applying full current |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Battery-powered ECG or SpO₂ monitor with dual-cell Li-ion pack requiring CE/FDA-compliant charging. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, thermal cutoff, and status indication without host MCU. Use Value: Eliminates need for external microcontroller supervision while meeting IEC 62368-1 thermal safety requirements. | Use Scenario: Rugged barcode scanner used in warehouse environments with frequent hot-swap battery operation. IC Role / Device Role / Timing Role: Dual-cell charge controller with EN pin enabling host-triggered charge initiation and STAT1 signaling battery state. Use Value: Enables rapid field battery replacement with automatic requalification and preconditioning on insertion. |
| Emergency Communication Radios | Wearable Diagnostic Sensors |
Use Scenario: Mission-critical two-way radio with 2S Li-ion backup battery needing guaranteed charge completion under variable input conditions. IC Role / Device Role / Timing Role: Autonomous charge manager using TIMER capacitor to enforce hard safety timeouts independent of software. Use Value: Guarantees charge termination even during power interruption or firmware failure. | Use Scenario: Skin-contact wearable measuring vital signs, requiring ultra-low leakage and thermal-aware charging. IC Role / Device Role / Timing Role: Linear charger with <1 µA reverse discharge (IDISCHARGE) and ratiometric thermistor interface for skin-temperature correlation. Use Value: Prevents battery self-discharge during storage and avoids thermal injury from unmonitored charging. |
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/UN | Fixed 8.2V regulation (vs. 8.4V); identical pinout, timing, and thermal features | Designed for coke-anode 2S cells; not suitable for graphite-anode packs requiring 8.4V | Select only when battery chemistry specifies 8.2V termination voltage |
| BQ24075RGTR | Single-chip solution with integrated 1.2A FET; no external MOSFET required; 8.4V option available | Lacks dedicated THREF/THERM ratiometric interface; uses ADC-based temp sensing with lower accuracy | Choose for space-constrained designs where integration outweighs thermal precision requirements |
Compared with MCP73842-820I/UN, the MCP73842-840I/UN provides higher termination voltage for graphite-anode 2S cells, while versus BQ24075RGTR it offers superior thermal safety assurance via hardware-ratiometric temperature monitoring - critical for medical and industrial certifications.
Availability
MCP73842-840I/UN is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, and emergency communication radios requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MCP73842-840I/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 since 1989.
The MCP7384X family was developed specifically for cost-sensitive, space-constrained linear battery charging applications requiring high-accuracy voltage regulation, autonomous safety timers, and integrated thermal monitoring - especially for dual-cell Li-ion systems.
FAQ
What battery chemistries and configurations is the MCP73842-840I/UN designed for?
The MCP73842-840I/UN is specifically designed for dual-series lithium-ion or lithium-polymer battery packs with graphite anodes requiring 8.4V termination. It is not intended for single-cell, 3S+, or non-Li-ion chemistries. Its preconditioning threshold (5.7V) and recharge threshold (VREG − 400 mV = 8.0V) are optimized for 2S graphite cells, and its 8.7–12V input range matches standard 2S wall adapters. The MCP73842-840I/UN does not support adjustable regulation voltage.
How does the MCP73842-840I/UN implement temperature monitoring, and what external components are required?
The MCP73842-840I/UN uses a ratiometric thermistor interface: THREF supplies a stable 2.55V reference to bias an external NTC or PTC thermistor network, and THERM reads the divided voltage. Internal comparators trip at VTHREF/2 (1.25V) and VTHREF/4 (0.62V) to detect out-of-range temperatures. No ADC or external op-amps are needed - only two resistors (RT1, RT2) and the thermistor, calculated per Microchip's DS21823D equations. This architecture makes the MCP73842-840I/UN immune to VDD fluctuations.
What is the function of the TIMER pin on the MCP73842-840I/UN, and how do I configure it?
The TIMER pin on the MCP73842-840I/UN accepts a capacitor (CTIMER) to set all three safety timers: precondition (60 min), fast-charge (1.5 hr), and elapsed-time termination (3.0 hr). With CTIMER = 0.1 µF, each timer hits its nominal value; scaling is linear (e.g., 0.2 µF doubles all periods). The capacitor connects between TIMER and VSS. No resistor is required. This passive configuration ensures deterministic, firmware-independent timeout behavior - a key safety feature of the MCP73842-840I/UN.
Can the MCP73842-840I/UN operate without an external P-channel MOSFET?
No, the MCP73842-840I/UN cannot operate without an external P-channel MOSFET. Its DRV pin is a gate driver output - not a power switch - designed to control the gate of an external high-side P-MOSFET (e.g., Si2301, DMG2301U). The IC regulates current and voltage by linearly biasing this MOSFET in its active region. Attempting to use the MCP73842-840I/UN without the external FET will result in no charge current flow. The sense resistor (RSENSE) must be placed between VDD and the MOSFET source.
What does the STAT1 output indicate during normal operation of the MCP73842-840I/UN?
STAT1 on the MCP73842-840I/UN is an open-drain status output that signals charge state: ON (pulled low) during preconditioning, constant-current, and constant-voltage phases; OFF (high-impedance) during qualification, charge completion, sleep (EN low), or battery disconnect; and flashing at ~1 Hz during safety faults (timer expiry, temperature violation, or UVLO). Its 7 mA sink capability allows direct LED drive with a series resistor; for MCU interfacing, a pull-up is required. The MCP73842-840I/UN does not provide multi-bit status encoding.
MCP73842-840I/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 ~ 2
- Current - Charging:
- -
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.4V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MCP73842-840I/UN FAQ
1.How can I place an order for MCP73842-840I/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73842-840I/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 MCP73842-840I/UN reliable?
The price and inventory of MCP73842-840I/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73842-840I/UN is usually 5 days.
3.What payment methods are accepted for MCP73842-840I/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73842-840I/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73842-840I/UN?
MCP73842-840I/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73842-840I/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 MCP73842-840I/UN?
For technical support, including MCP73842-840I/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73842-840I/UN requirements.
6.How does Aetrix verify that MCP73842-840I/UN is sourced from the original manufacturer or authorized distributors?
All MCP73842-840I/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 MCP73842-840I/UN meets industry standards.
7.What is the process for return or replacement of MCP73842-840I/UN?
All MCP73842-840I/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73842-840I/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 MCP73842-840I/UN part is unused and in its original packaging.
Return procedure for MCP73842-840I/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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