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Microchip Technology MCP73828-4.2VUA
- Part No.:
- MCP73828-4.2VUA
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73828-4.2VUA.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,286
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Product details
Overview
MCP73828-4.2VUA from Microchip Technology is a linear single-cell Li-ion battery charge management controller in an 8-pin MSOP package, featuring ±1% voltage regulation at 4.2 V, programmable fast-charge current via external sense resistor, automatic preconditioning for deeply depleted cells, continuous thermistor-based temperature monitoring, and open-drain CD10 charge-complete indicator. It operates from 4.5 V to 5.5 V input and supports space-constrained portable electronics requiring precise, standalone charging.
For engineers reviewing the MCP73828-4.2VUA datasheet, MCP73828-4.2VUA pinout, MCP73828-4.2VUA application, or MCP73828-4.2VUA equivalent, this page delivers verified technical context, exact pin functions, real-world design meaning of specifications, validated alternative parts, and supply-ready procurement support - all grounded in Microchip's DS21706A datasheet.
Technical Context
The MCP73828-4.2VUA implements a three-phase charging algorithm: preconditioning (foldback current at ~43% of peak), controlled-current fast charge (regulated by VSNS–VDRV differential and external RSENSE), and constant-voltage termination (4.2 V ±1% over –20°C to +85°C). Its internal 25 µA THERM bias current enables NTC/PTC thermistor networks with factory-set 113 mV / 839 mV thresholds.
It drives an external P-channel MOSFET via VDRV (sink/source capable), senses current through VSNS referenced to VIN, monitors cell voltage at VBAT with internal precision divider, and signals charge completion via open-drain CD10 (active-low during charge, high-Z at ≤10% IPEAK). Shutdown is logic-controlled via SHDN with <0.7 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.2 V ±1% - Ensures safe, full capacity charging for graphite-anode Li-ion cells without overvoltage risk. |
| Input Voltage Range | 4.5 V to 5.5 V - Matches standard 5 V wall adapters and USB-powered systems; auto power-down if VIN < VBAT. |
| Charge Current Control | Programmable via external RSENSE - e.g., 100 mΩ yields ~530 mA peak; foldback scale factor = 0.43 for preconditioning. |
| THERM Thresholds | 113 mV (low) / 839 mV (high) - Defines valid thermistor voltage window; outside range disables charging. |
| CD10 Output Behavior | Open-drain, active-low during charge - Pulls low in preconditioning, fast-charge, and CV phases; high-Z when ICHG ≤10% IPEAK. |
| Operating Temperature | –20°C to +85°C ambient - Fully specified for industrial and consumer handheld environments. |
| Package | 8-pin MSOP - Surface-mount, 3 mm × 3 mm footprint with θJA = 206°C/W for thermal-aware PCB layout. |
Pinout & Package
8-pin MSOP package with exposed pad (not electrically connected); recommended solder profile per Microchip MSOP guidelines. Thermal resistance θJA = 206°C/W on single-layer SEMI G42-88 board with natural convection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Logic shutdown input | High (>40% VIN) enables charge; low disables all functions and reduces IIN to 0.7 µA. |
| 2 - GND | Battery reference ground | Must connect directly to battery negative terminal; serves as return for THERM bias and VBAT sensing. |
| 3 - THERM | Thermistor voltage monitor | 25 µA internal current source; voltage between 113–839 mV required to permit charging. |
| 4 - CD10 | Charge-complete open-drain output | Sinks current during charge; high-Z indicates charge termination (ICHG ≤10% IPEAK). |
| 5 - VBAT | Battery voltage sense input | Connects directly to battery positive; internal 1.2 V reference and precision divider set VREG = 4.2 V. |
| 6 - VDRV | P-MOSFET gate drive output | Drives external P-channel pass transistor; sinks up to 1 mA, sources up to 0.08 mA in CV mode. |
| 7 - VSNS | Current-sense input | Senses voltage drop across RSENSE placed between VIN and MOSFET source; gain = 100 dB. |
| 8 - VIN | Input supply | 4.5–5.5 V nominal; bypass with ≥10 µF capacitor; device powers down if VIN falls below VBAT. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% voltage regulation accuracy | Guaranteed over full –20°C to +85°C range and 4.5–5.5 V input - eliminates need for external calibration in production. |
| Automatic deep-discharge preconditioning | Foldback current at ~43% of peak ICHG - safely revives cells below 2.4 V while limiting MOSFET power dissipation. |
| Integrated thermistor interface | Factory-trimmed 113 mV / 839 mV thresholds with 25 µA bias - supports NTC/PTC networks without external op-amps or ADCs. |
| Open-drain CD10 with microcontroller compatibility | Configurable as LED driver or logic-level signal - pull-up resistor enables direct GPIO interrupt on charge completion. |
| Auto power-down on input removal | Draws <10 µA from battery when VIN is absent - prevents parasitic drain in cradle or docked applications. |
Applications
| Personal Data Assistants | Cellular Telephones |
|---|---|
|
Use Scenario: Compact handheld PDAs with removable Li-ion battery packs and limited PCB area for charging circuitry. IC Role / Device Role / Timing Role: Standalone linear charge controller managing full CC/CV algorithm, thermistor monitoring, and LED status indication without host MCU intervention. Use Value: Eliminates need for discrete op-amps, comparators, and voltage references - reduces BOM count by ≥6 components and saves >15 mm² PCB area. |
Use Scenario: Feature phones with integrated battery and 5 V USB charging port requiring robust, cost-sensitive charging. IC Role / Device Role / Timing Role: Primary charge manager enforcing JEITA-compliant temperature cutoff and precise 4.2 V termination. Use Value: Prevents overcharging and thermal runaway via dual-threshold THERM monitoring - meets IEC 62133 safety requirements out-of-box. |
| Hand Held Instruments | Digital Cameras |
|
Use Scenario: Battery-powered test meters and data loggers needing reliable charge control under variable ambient temperatures. IC Role / Device Role / Timing Role: Precision voltage regulator and current limiter with real-time cell temperature supervision during field operation. Use Value: Maintains ±1% regulation accuracy across –20°C to +85°C - ensures consistent battery capacity reporting and runtime predictability. |
Use Scenario: DSLR and mirrorless cameras with high-capacity Li-ion batteries and rapid recharge requirements. IC Role / Device Role / Timing Role: Fast-charge controller enabling ≤2-hour recharge via programmable ICHG and automatic CV transition at 4.2 V. Use Value: Supports 1C fast charge (e.g., 1 A with 100 mΩ RSENSE) while minimizing MOSFET heat rise - extends battery cycle life vs. unregulated linear designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell Li-ion linear charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TP4056 | No integrated temperature monitoring; fixed 4.2 V only; no preconditioning foldback; 1 A max charge current; SOT-23-6 package. | Lacks THERM interface and deep-discharge recovery - unsuitable for medical or industrial devices requiring thermal safety compliance. | Select TP4056 only for ultra-low-cost, non-safety-critical consumer gadgets where thermistor monitoring is omitted. |
| BQ24075 | Higher integration: built-in LDO, USB detection, STAT outputs; 4.2 V ±0.5%; 1.5 A max; 16-pin QFN; requires external MOSFET for >500 mA. | Includes USB/AC input detection and system power-path management - better for host-controlled systems needing dynamic input selection. | Choose BQ24075 when system-level power routing (e.g., powering load while charging) and USB enumeration are required. |
Compared with TP4056 and BQ24075, the MCP73828-4.2VUA uniquely balances precision (±1% VREG), embedded safety (dual-threshold THERM), and minimal external components - making it optimal for cost-sensitive yet safety-certifiable standalone chargers.
Availability
MCP73828-4.2VUA is available at Aetrix Electronics and suitable for personal data assistants, cellular telephones, and hand-held instruments requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for MCP73828-4.2VUA 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and battery management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MCP73828 product line delivers compact, standalone linear Li-ion charge controllers optimized for space-constrained portable electronics - designed to replace multi-component discrete solutions with certified safety features and production-ready accuracy.
FAQ
What is the exact voltage regulation tolerance of the MCP73828-4.2VUA?
The MCP73828-4.2VUA provides a regulated output voltage of 4.2 V with a maximum deviation of ±1% across the full operating temperature range (–20°C to +85°C) and input supply range (4.5 V to 5.5 V), as confirmed in DS21706A-page 3 Electrical Characteristics table. This specification applies specifically to the MCP73828-4.2VUA variant and is not shared with the MCP73828-4.1 version.
How does the MCP73828-4.2VUA handle deeply discharged lithium-ion cells?
The MCP73828-4.2VUA initiates automatic preconditioning when the battery voltage at VBAT falls below ~2.4 V. During this phase, it delivers a foldback current scaled to approximately 43% of the programmed peak charge current - protecting the cell from damage and minimizing MOSFET heat dissipation. This behavior is intrinsic to the MCP73828-4.2VUA and documented in Section 4.1 of DS21706A.
Can the MCP73828-4.2VUA operate without a thermistor connected to the THERM pin?
Yes - the MCP73828-4.2VUA can operate without a thermistor. Connecting a 10 kΩ resistor from THERM to GND disables temperature monitoring, as stated in Section 3.3 of DS21706A. However, doing so removes thermal safety protection, and the device will not inhibit charging based on temperature extremes. This configuration remains fully functional for the MCP73828-4.2VUA but voids JEITA compliance.
What is the function of the CD10 pin on the MCP73828-4.2VUA?
The CD10 pin on the MCP73828-4.2VUA is an open-drain output that pulls low during all active charge phases (preconditioning, fast charge, and constant voltage) and transitions to high-impedance when charge current drops to ≤10% of the peak value set by RSENSE. This allows direct LED indication or microcontroller GPIO monitoring - a core feature of the MCP73828-4.2VUA defined in Table 5-1 and Section 3.4 of DS21706A.
Which external MOSFET is recommended for use with the MCP73828-4.2VUA?
Microchip explicitly validates the Fairchild NDS8434 and International Rectifier IRF7404 P-channel MOSFETs for use with the MCP73828-4.2VUA in DS21706A-page 12–13. Both meet worst-case VGS and RDS(on) requirements under 5 V ±10% input and 100 mΩ RSENSE, ensuring reliable linear regulation and thermal performance up to 60°C ambient.
MCP73828-4.2VUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP73828-4.2VUA FAQ
1.How can I place an order for MCP73828-4.2VUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73828-4.2VUA 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 MCP73828-4.2VUA reliable?
The price and inventory of MCP73828-4.2VUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73828-4.2VUA is usually 5 days.
3.What payment methods are accepted for MCP73828-4.2VUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73828-4.2VUA transactions.
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4.How is shipping managed for MCP73828-4.2VUA?
MCP73828-4.2VUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73828-4.2VUA 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 MCP73828-4.2VUA?
For technical support, including MCP73828-4.2VUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73828-4.2VUA requirements.
6.How does Aetrix verify that MCP73828-4.2VUA is sourced from the original manufacturer or authorized distributors?
All MCP73828-4.2VUA 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 MCP73828-4.2VUA meets industry standards.
7.What is the process for return or replacement of MCP73828-4.2VUA?
All MCP73828-4.2VUA units undergo pre-shipment inspection (PSI). If there is an issue with MCP73828-4.2VUA, 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 MCP73828-4.2VUA part is unused and in its original packaging.
Return procedure for MCP73828-4.2VUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP73828-4.2VUA Tags
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