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Microchip Technology MCP73826-4.2VCHTR
- Part No.:
- MCP73826-4.2VCHTR
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- SOT-23-6
- Datasheet:
-
MCP73826-4.2VCHTR.pdf
- Description:
- IC BATT CNTL LI-ION 1CEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
MCP73826-4.2VCHTR from Microchip Technology is a linear single-cell lithium-ion battery charge management controller in 6-pin SOT-23A package, featuring ±1% voltage regulation accuracy at 4.2 V, programmable fast-charge current via external sense resistor, and automatic preconditioning for deeply depleted cells. It operates from 4.5 V to 5.5 V input and supports industrial temperature range (–20°C to +85°C), used in space-constrained portable electronics requiring standalone charging.
For engineers reviewing the MCP73826-4.2VCHTR datasheet, MCP73826-4.2VCHTR pinout, MCP73826-4.2VCHTR application, or MCP73826-4.2VCHTR equivalent, key selection criteria include fixed 4.2 V regulation voltage, external P-channel MOSFET drive capability, foldback current preconditioning, thermal design constraints due to linear operation, and compatibility with standard 10 µF output capacitance for loop stability.
Technical Context
The MCP73826-4.2VCHTR implements a three-phase charge algorithm: preconditioning (foldback current at ~43% of peak), controlled-current fast charge (regulated by VSNS voltage drop across external RSENSE), and constant-voltage termination (4.2 V ±1%). Its internal voltage reference (1.2 V) feeds precision amplifiers that control VDRV gate drive to an external P-MOSFET, enabling linear regulation without integrated pass transistor.
Functional block integration includes dedicated charge-current foldback amplifier, voltage-control amplifier with 352.5 kΩ feedback resistor (specific to -4.2 variant), and logic-level SHDN input that reduces supply current to 0.5 µA in shutdown. The device enters automatic power-down when VIN falls below VBAT, preventing battery discharge during input removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.2 V ±1% - precise termination threshold for graphite-anode Li-ion cells, ensuring full capacity without overvoltage stress. |
| Input Voltage Range | 4.5 V to 5.5 V - matches standard USB 5 V and wall adapters; operation outside this range not supported. |
| Charge Current Control | Programmable via external RSENSE - 50 mΩ yields ~1 A peak; foldback scale factor K = 0.43 enables safe preconditioning. |
| Temperature Range | –20°C to +85°C - fully specified ambient operating range; junction limit is 150°C with θJA = 230°C/W. |
| Package | 6-pin SOT-23A (EIAJ SC-74) - surface-mount, low-profile package with exposed pad not present; requires standard reflow profile. |
| Shutdown Current | 0.5 µA typical - ultra-low quiescent draw in SHDN mode, critical for battery-powered standby applications. |
| VBAT Sensing Accuracy | ±1 mV load regulation - ensures stable regulation under varying charge current (10–75 mA), minimizing voltage droop at battery terminals. |
Pinout & Package
Package: 6-pin SOT-23A (EIAJ SC-74), tape-and-reel (TR) format, marked "CP" per Microchip packaging specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Logic shutdown control input | Active-high enable; >40% VIN = enable, <25% VIN = shutdown; pulls VDRV low to disable external P-MOSFET. |
| 2 - GND | Battery reference ground | 0 V reference for all analog circuitry; must connect directly to battery negative terminal to avoid sensing error. |
| 3 - VBAT | Cell voltage monitor input | Direct connection to battery positive; internal 1.2 V reference and precision divider set 4.2 V regulation point. |
| 4 - VDRV | External P-MOSFET gate drive output | Sink/source capable (0.08 mA sink / 1 mA source); drives gate in linear region for current/voltage regulation. |
| 5 - VIN | Input supply input | 4.5–5.5 V supply; powers internal circuitry and provides bias for VDRV; auto-power-down if VIN < VBAT. |
| 6 - VSNS | Current sense input | Monitors voltage drop across external RSENSE; 40–75 mV threshold sets IOUT = VCS/RSENSE. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.2 V regulation | Optimized for graphite-anode Li-ion cells; eliminates need for external voltage-setting resistors or DACs. |
| Automatic preconditioning | Applies ~43% scaled current when cell voltage <2.4 V, protecting degraded cells and reducing MOSFET thermal stress. |
| External P-MOSFET drive | VDRV output supports discrete high-efficiency pass devices (e.g., NDS8434), enabling scalable current beyond IC limits. |
| Thermal-aware power-down | Disables VDRV and reduces IIN to 0.5 µA when VIN drops below VBAT, preventing reverse battery drain. |
| Stable with minimal output capacitance | Guaranteed stability with ≥10 µF at VBAT-GND, accommodating cost-sensitive designs without low-ESR capacitor requirements. |
Applications
| Portable Medical Sensors | USB-Powered Handheld Instruments |
|---|---|
Use Scenario: Rechargeable wearable pulse oximeters using single-cell Li-ion batteries with strict size and thermal constraints. IC Role / Device Role / Timing Role: Standalone linear charge controller managing full CC/CV profile, interfacing directly with battery and USB 5 V input. Use Value: Eliminates host MCU involvement in charging; ±1% voltage accuracy extends battery cycle life; 6-pin SOT-23A footprint saves PCB area in compact enclosures. | Use Scenario: Field-deployed multimeters and thermal imagers requiring reliable, maintenance-free battery charging from USB ports. IC Role / Device Role / Timing Role: Primary charge management unit regulating current and voltage while monitoring cell health via VBAT feedback. Use Value: Preconditioning prevents damage to infrequently used batteries; automatic power-down preserves battery charge when USB is disconnected. |
| Smart Home Remote Controls | Bluetooth Audio Accessories |
Use Scenario: Voice-controlled remotes with rechargeable Li-ion batteries and no user-serviceable battery compartment. IC Role / Device Role / Timing Role: Integrated charge manager handling insertion detection, preconditioning, and CV termination without firmware. Use Value: Reduces BOM count by replacing discrete op-amp/comp-based chargers; 0.5 µA shutdown current minimizes self-discharge during storage. | Use Scenario: True wireless stereo earbuds requiring compact, thermally efficient charging in sealed earbud cases. IC Role / Device Role / Timing Role: Linear charger driving external P-MOSFET to deliver up to 1 A while maintaining tight 4.2 V regulation. Use Value: Foldback current prevents overheating during initial charge of deeply discharged cells; 10 µF stability margin simplifies layout in dense RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear single-cell Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-420I/OT | Integrated P-MOSFET (500 mA max), same 4.2 V regulation, 5-pin SOT-23 package | No external transistor required; lower thermal overhead but fixed current limit and reduced flexibility | Select when board space is extremely limited and charge current ≤500 mA suffices; not suitable for >500 mA or discrete MOSFET optimization. |
| BQ24075RGTR | TI part with integrated 1.2 A switch-mode charger, 4.2 V regulation, I2C interface, thermal regulation | Higher efficiency, programmable settings, and status reporting; requires MCU interaction and more complex layout | Select when efficiency >80% is mandatory, ambient temperature exceeds 60°C, or host-controlled charge sequencing is needed. |
Compared with MCP73831T-420I/OT, the MCP73826-4.2VCHTR offers higher peak current scalability and thermal design freedom via external MOSFET, while BQ24075RGTR trades simplicity for efficiency and digital control-making MCP73826-4.2VCHTR optimal for cost-sensitive, MCU-less, thermally managed linear charging.
Availability
MCP73826-4.2VCHTR is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered handheld instruments, smart home remote controls, and Bluetooth audio accessories requiring stable component supply and long-term production continuity.
Supply support for MCP73826-4.2VCHTR 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global distribution and design support infrastructure.
The MCP738xx family delivers cost-optimized, space-efficient linear charge controllers for consumer and industrial Li-ion applications where simplicity, reliability, and minimal external components are prioritized over switching efficiency.
FAQ
What is the exact regulation voltage tolerance of the MCP73826-4.2VCHTR?
The MCP73826-4.2VCHTR has a regulated output voltage of 4.2 V with a maximum deviation of ±1% over the full operating temperature range (–20°C to +85°C) and input supply range (4.5 V to 5.5 V). This corresponds to a guaranteed range of 4.158 V to 4.242 V, verified per DS21705B electrical characteristics table.
Can the MCP73826-4.2VCHTR operate without an external P-channel MOSFET?
No, the MCP73826-4.2VCHTR cannot operate without an external P-channel MOSFET. It is a controller-only IC: VDRV drives the gate of an external pass transistor (e.g., NDS8434), and no internal power switch is integrated. Omitting the MOSFET leaves no current path from VIN to battery, rendering the MCP73826-4.2VCHTR nonfunctional.
How is charge current programmed on the MCP73826-4.2VCHTR?
Charge current is programmed using an external sense resistor (RSENSE) between VIN and the source of the external P-MOSFET. The MCP73826-4.2VCHTR regulates current by maintaining 40–75 mV across RSENSE; peak current is calculated as IOUT = VCS/RSENSE, where VCS = 53 mV typical. For example, a 100 mΩ resistor yields ~530 mA peak.
Does the MCP73826-4.2VCHTR support automatic recharge after battery voltage drops?
Yes, the MCP73826-4.2VCHTR supports automatic recharge. When the battery voltage falls below the recharge threshold (typically ~4.05 V, 3% below VREG), and SHDN remains high, the device reinitiates the full CC/CV charge cycle. This behavior is inherent and requires no external circuitry or host intervention.
What is the minimum output capacitance required for stable operation of the MCP73826-4.2VCHTR?
The MCP73826-4.2VCHTR requires a minimum 10 µF capacitor from VBAT to GND for stable constant-voltage loop operation, especially when the battery is disconnected. This capacitance compensates for inductive effects in battery interconnects and ensures phase margin; tantalum or aluminum electrolytic types are acceptable, and ESR is not tightly constrained.
MCP73826-4.2VCHTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- SOT-23-6
MCP73826-4.2VCHTR FAQ
1.How can I place an order for MCP73826-4.2VCHTR through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73826-4.2VCHTR 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 MCP73826-4.2VCHTR reliable?
The price and inventory of MCP73826-4.2VCHTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73826-4.2VCHTR is usually 5 days.
3.What payment methods are accepted for MCP73826-4.2VCHTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73826-4.2VCHTR transactions.
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4.How is shipping managed for MCP73826-4.2VCHTR?
MCP73826-4.2VCHTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73826-4.2VCHTR 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 MCP73826-4.2VCHTR?
For technical support, including MCP73826-4.2VCHTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73826-4.2VCHTR requirements.
6.How does Aetrix verify that MCP73826-4.2VCHTR is sourced from the original manufacturer or authorized distributors?
All MCP73826-4.2VCHTR 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 MCP73826-4.2VCHTR meets industry standards.
7.What is the process for return or replacement of MCP73826-4.2VCHTR?
All MCP73826-4.2VCHTR units undergo pre-shipment inspection (PSI). If there is an issue with MCP73826-4.2VCHTR, 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 MCP73826-4.2VCHTR part is unused and in its original packaging.
Return procedure for MCP73826-4.2VCHTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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