MCP73812T-420I/OT Microchip Integrated Circuit (SOT23 (5-Pin)) In Stock
MCP73812T-420I/OT is a linear Li-Ion and Li-Polymer battery charge controller from Microchip, targeting 4.2 V single-cell charging with an adjustable charge current and status output in a 5-pin SOT-23 package. Designed for compact USB and wall-adapter powered portable devices. Available in stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MCP73812T-420I/OT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5300(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP73812T-420I/OT?
- 4.2 V preset termination voltage matches standard Li-Ion and Li-Polymer single-cell chemistry, eliminating an external precision reference
- Adjustable charge current via a single external resistor (PROG pin) allows programming from a few milliamps to 500 mA for a wide range of cell capacities
- Charge status output pin provides a charge-complete or charging indicator to drive an LED or microcontroller GPIO with no external logic
- SOT-23-5 package in under 9 mm² footprint integrates cleanly beside a Li-Ion cell connector on space-constrained wearable and IoT PCBs
What is MCP73812T-420I/OT used for?
MCP73812T-420I/OT is used in USB-powered portable devices such as Bluetooth earbuds, fitness trackers, and handheld medical monitors that require simple, compact single-cell Li-Ion or Li-Polymer charging from a 5 V USB bus or wall adapter. Its single-resistor programmable charge current simplifies BOM and layout for designs charging 100 mAh to 1000 mAh pouch cells. The integrated charge-complete status output enables visual charge indication with a single LED and no additional logic, reducing design complexity in IoT sensor nodes and wearable charger circuits.
What are the specifications of MCP73812T-420I/OT?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-5 |
| Factory Lead Time | 1Week |
| YTEOL | 8 |
| Adjustable Threshold | YES |
| Analog IC - Other Type | LINEAR BATTERY CHARGER |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP5/6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Current-Max (Isup) | 1.5mA |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 3.75V |
| Supply Voltage-Nom (Vsup) | 5.2V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +4.2V |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP73812T-420I/OT datasheet?
MCP73812T-420I/OT Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP73812T-420I/OT?
Compatible alternatives and drop-in replacements for MCP73812T-420I/OT:
suggested
suggested
Frequently Asked Questions
How is the charge current of MCP73812T-420I/OT programmed, and what current range is achievable?
Charge current is set by connecting a single resistor from the PROG pin to ground; the relationship is typically ICHARGE = VPROG / RPROG where VPROG is approximately 1 V. Using resistors from about 2 kΩ to 100 kΩ allows charge currents from roughly 10 mA to 500 mA, covering Li-Ion cells from 50 mAh coin cells (C/5 rate = 10 mA) to 2500 mAh pouch cells at a 0.2C gentle charge rate.
What termination voltage does MCP73812T-420I/OT use, and why is 4.2 V correct for standard Li-Ion cells?
MCP73812T-420I/OT terminates charging at 4.2 V, matching the standard full-charge voltage for graphite-anode lithium-ion and lithium-polymer cells used in consumer electronics. Overcharging above 4.2 V reduces cell cycle life and can trigger thermal runaway; the factory-trimmed 4.2 V threshold eliminates the need for an external precision reference or external comparator, reducing the component count versus discrete charger designs by 3 to 5 parts.
For a Bluetooth earphone charging case powered from a 5 V USB port, how does MCP73812T-420I/OT fit into the design?
Connected directly between the 5 V USB VBUS and a 200 mAh Li-Po cell, MCP73812T-420I/OT with a 5 kΩ PROG resistor sets a 200 mA charge current (1C rate), fully charging the cell in about 1 hour. The SOT-23-5 package occupies less than 9 mm² next to the USB Type-C receptacle, and the status pin drives a single surface-mount LED to show charge complete — the entire charger circuit requires fewer than 5 external components.
How does the linear charger topology of MCP73812T-420I/OT compare to a switching charger for a compact wearable application?
A linear charger like MCP73812T-420I/OT dissipates the voltage difference between the 5 V input and 4.2 V battery as heat (up to 400 mW at 500 mA), but requires no inductor, diode, or switching noise filter. For cells under 500 mAh charged at 0.5C or less, the efficiency loss (typically 16% at end of charge) is acceptable, and the elimination of a 3 MHz switching regulator reduces EMI and BOM cost by 4 to 6 components versus a buck-mode switcher charger.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.6010 | $0.60 |
| 100+ | $0.5500 | $55.00 |
| 1000+ | $0.5400 | $540.00 |
| 5000+ | $0.5300 | $2650.00 |
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