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Microchip Technology MCP73828-4.2VUATR
- Part No.:
- MCP73828-4.2VUATR
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73828-4.2VUATR.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
MCP73828-4.2VUATR 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, and continuous thermistor-based temperature monitoring. It delivers stable charging for portable electronics with integrated CD10 open-drain charge-complete indication.
For engineers reviewing the MCP73828-4.2VUATR datasheet, MCP73828-4.2VUATR pinout, MCP73828-4.2VUATR application, or MCP73828-4.2VUATR equivalent, this page provides verified functional specifications, validated pin roles, confirmed thermal and voltage thresholds, real-world charge-phase timing behavior, and direct alternative part comparisons - all extracted from Microchip's DS21706A datasheet and official application guidance.
Technical Context
The MCP73828-4.2VUATR implements a three-phase charge algorithm: preconditioning (foldback current at ~43% of peak), controlled-current fast charge (regulated by VSNS–VDRV differential and RSENSE), and constant-voltage termination (4.2 V ±1%). Its internal 25 µA THERM bias current interfaces with NTC/PTC networks to enforce shutdown when sensed voltage falls outside 113 mV–839 mV - corresponding to typical –0.5°C to +44.2°C with a 10 kΩ NTC.
VDRV drives an external P-channel MOSFET in linear mode; VIN operates from 4.5 V to 5.5 V; CD10 asserts low during active charge and transitions to high-impedance when charge current drops below 10% of IPEAK; SHDN enables/disables operation with logic-level control and reduces supply current to 0.7 µA in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.2 V ±1% - precisely targets graphite-anode Li-ion cells; ensures safe full-charge without overvoltage stress. |
| Input Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V wall adapters; auto-power-down if VIN < VBAT prevents battery drain. |
| Charge Current Programming | Externally set via RSENSE - e.g., 100 mΩ yields ~530 mA peak; foldback scale factor fixed at 0.43 for preconditioning. |
| THERM Thresholds | 113 mV (low) / 839 mV (high) - defines valid thermistor voltage window; maps to user-configurable temperature range. |
| CD10 Output Behavior | Open-drain, sinks ≤30 mA - pulls low during all active charge phases; high-Z indicates charge completion (I<sub>CHG ≤ 10% IPEAK). |
| Operating Temperature | –20°C to +85°C ambient - fully specified for industrial-grade portable equipment; junction limit 150°C. |
| Package | 8-pin MSOP - surface-mount, 3 mm × 3 mm footprint; θJA = 206°C/W on single-layer board. |
Pinout & Package
8-pin MSOP package with exposed pad (not electrically connected); thermal resistance θJA = 206°C/W on standard SEMI G42-88 board. Pin functions are validated per DS21706A-page 3 and page 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Logic enable/disable input | High ≥40% VIN enables charge; low disables all functions and reduces IIN to 0.7 µA. |
| 2 GND | Battery reference node | Must connect directly to battery negative terminal; serves as return for THERM, VSNS, and VBAT sensing. |
| 3 THERM | Temperature monitor input | 25 µA bias current source; shutdown triggered if voltage <113 mV or >839 mV - configurable via thermistor network. |
| 4 CD10 | Charge-complete indicator | Open-drain output; low = charging active; high-Z = charge complete (I<sub>CHG ≤10% IPEAK); supports LED or MCU interface. |
| 5 VBAT | Battery voltage sense input | Direct connection to battery positive; internal precision divider regulates to 4.2 V; bypass ≥10 µF to GND for stability. |
| 6 VDRV | P-MOSFET gate driver | Linear drive output; controls external P-channel pass transistor; sinks up to 1 mA in CV mode. |
| 7 VSNS | Current sense input | Senses voltage drop across external RSENSE between VIN and MOSFET source; sets IPEAK via VCS = 53 mV typ. |
| 8 VIN | Power supply input | 4.5–5.5 V input; powers IC and charges battery; auto-shutdown if VIN < VBAT prevents reverse discharge. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% voltage regulation accuracy | Guaranteed over –20°C to +85°C and 4.5–5.5 V input; eliminates need for post-charge calibration in cost-sensitive designs. |
| Automatic preconditioning | Applies ~43% foldback current when VBAT < 2.4 V; safely revives deeply discharged cells while limiting MOSFET power dissipation. |
| Integrated temperature monitoring | Factory-trimmed 113 mV / 839 mV thresholds with 25 µA THERM bias; supports NTC/PTC networks without external op-amps. |
| Charge-complete signaling (CD10) | Hardware-driven open-drain output synchronized to 10% IPEAK threshold; eliminates need for MCU polling or ADC sampling. |
| Low-quiescent shutdown | 0.7 µA supply current in SHDN-low state; extends shelf life of battery-powered devices with no external disable circuitry. |
Applications
| Smartphone Charging Circuit | Digital Camera Battery Pack |
|---|---|
Use Scenario: Standalone USB-powered Li-ion charger for compact handheld camera with removable battery pack. IC Role / Device Role / Timing Role: Primary charge controller managing preconditioning, CC/CV profile, and thermally gated termination. Use Value: Enables single-chip, no-software charging with precise 4.2 V cutoff and automatic thermal abort - critical for safety-certified consumer imaging devices. |
Use Scenario: Integrated cradle charger for professional digital camera with dual-bay hot-swap capability. IC Role / Device Role / Timing Role: Dual-channel charge manager (one per bay) coordinating charge sequencing and CD10 status reporting to host MCU. Use Value: Delivers deterministic charge completion signal and real-time temperature fault detection - enabling reliable multi-battery rotation without firmware intervention. |
| Handheld Medical Instrument | Industrial PDA with Extended Runtime |
Use Scenario: Portable ECG monitor requiring UL/IEC 60601-compliant battery charging under variable ambient conditions. IC Role / Device Role / Timing Role: Safety-critical charge supervisor enforcing strict thermal limits and voltage accuracy per medical battery standards. Use Value: Factory-trimmed ±1% regulation and dual-threshold THERM monitoring satisfy essential safety requirements without external calibration or redundancy. |
Use Scenario: Ruggedized industrial PDA operating in warehouses with wide temperature swings and frequent hot-swap battery use. IC Role / Device Role / Timing Role: Robust charge manager handling repeated insertion/removal, preconditioning of partially discharged packs, and ambient-temperature-adapted termination. Use Value: Auto-restart after battery reinsertion and guaranteed –20°C to +85°C operation ensure uninterrupted field deployment without manual reset or recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-420I/OT | Single-chip solution with integrated MOSFET; 4.2 V fixed regulation; no external RSENSE or THERM network required. | Eliminates external pass transistor and thermistor components; lower BOM count but fixed 500 mA max charge current. | Select when board space and component count outweigh flexibility in charge current and thermal configuration. |
| BQ24075RGTR | TI device with integrated 1.2 A FET, USB-compatible input current limit (100/500 mA), and STAT pin instead of CD10. | Supports USB enumeration and input current limiting; lacks dedicated THERM pin - uses TS pin with different bias and thresholds. | Select when USB compliance, higher integration, or programmable input current are mandatory; verify thermal monitoring method matches system requirements. |
Compared with MCP73828-4.2VUATR, MCP73831T-420I/OT trades external component flexibility for smaller footprint and simpler layout, while BQ24075RGTR adds USB functionality and higher current but requires redesign of thermal sensing and charge-status interfacing.
Availability
MCP73828-4.2VUATR is available at Aetrix Electronics and suitable for smartphone charging circuits, digital camera battery packs, handheld medical instruments, and industrial PDAs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP73828-4.2VUATR 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 power management ICs, with a focus on reliability, longevity, and industrial-grade qualification.
The MCP738xx family was designed specifically for cost-sensitive, space-constrained Li-ion charging applications where precision voltage regulation, thermal safety, and minimal external components are essential - targeting portable consumer and medical electronics.
FAQ
What is the exact voltage regulation accuracy of the MCP73828-4.2VUATR?
The MCP73828-4.2VUATR guarantees ±1% regulation accuracy over its full operating range (–20°C to +85°C ambient, 4.5 V to 5.5 V input). Measured values show 4.141 V (min) to 4.242 V (max) at 25°C, confirming tight tolerance for graphite-anode Li-ion cells without external trimming.
How does the MCP73828-4.2VUATR handle deeply discharged batteries?
The MCP73828-4.2VUATR automatically enters preconditioning mode when VBAT falls below ~2.4 V, applying a foldback current scaled to 43% of the programmed peak charge current. This protects cell integrity and minimizes MOSFET heating during initial recovery - a behavior confirmed in DS21706A section 4.1.
Can the MCP73828-4.2VUATR be used without a thermistor?
Yes - connecting a 10 kΩ resistor between THERM and GND disables temperature monitoring, as explicitly stated in DS21706A section 3.3. The device will operate normally in all other respects, but thermal safety shutdown will not activate.
What is the function of the CD10 pin on the MCP73828-4.2VUATR?
The CD10 pin on the MCP73828-4.2VUATR is an open-drain output that pulls low during preconditioning, controlled-current, and constant-voltage charge phases. It transitions to high-impedance when charge current drops to ≤10% of the peak value - providing hardware-level charge-complete signaling without MCU polling.
Which external MOSFET is recommended for use with the MCP73828-4.2VUATR?
Microchip's DS21706A recommends the Fairchild NDS8434 and International Rectifier IRF7404 P-channel MOSFETs. Both meet the required VGS and RDS(on) specs under worst-case conditions (e.g., VGS ≥ –2.8 V, RDS(on) ≤ 242 mΩ at –2.8 V) and have been validated in thermal testing with 1 A charge current.
MCP73828-4.2VUATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MCP73828-4.2VUATR FAQ
1.How can I place an order for MCP73828-4.2VUATR through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73828-4.2VUATR 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 MCP73828-4.2VUATR reliable?
The price and inventory of MCP73828-4.2VUATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73828-4.2VUATR is usually 5 days.
3.What payment methods are accepted for MCP73828-4.2VUATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73828-4.2VUATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73828-4.2VUATR?
MCP73828-4.2VUATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73828-4.2VUATR 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 MCP73828-4.2VUATR?
For technical support, including MCP73828-4.2VUATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73828-4.2VUATR requirements.
6.How does Aetrix verify that MCP73828-4.2VUATR is sourced from the original manufacturer or authorized distributors?
All MCP73828-4.2VUATR 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 MCP73828-4.2VUATR meets industry standards.
7.What is the process for return or replacement of MCP73828-4.2VUATR?
All MCP73828-4.2VUATR units undergo pre-shipment inspection (PSI). If there is an issue with MCP73828-4.2VUATR, 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 MCP73828-4.2VUATR part is unused and in its original packaging.
Return procedure for MCP73828-4.2VUATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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