My Inquiry
My Account
Microchip Technology MCP73812T-420I/OT
- Part No.:
- MCP73812T-420I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP73812T-420I/OT.pdf
- Description:
- IC BATT CNTL LI-ION 1CEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:27,655
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP73812T-420I/OT from Microchip Technology is a fully integrated linear lithium-ion/lithium-polymer battery charge management controller in a 5-lead SOT-23 package. It delivers constant-current/constant-voltage charging with factory-set 4.20 V ±1% regulation, programmable 50–500 mA charge current via external resistor, thermal regulation, and reverse discharge protection - designed for compact USB-powered portable devices.
For engineers reviewing the MCP73812T-420I/OT datasheet, MCP73812T-420I/OT pinout, MCP73812T-420I/OT application, or MCP73812T-420I/OT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options for cost-sensitive, space-constrained Li-ion charging systems.
Technical Context
The MCP73812T-420I/OT implements a two-stage CC/CV charge algorithm with fixed 4.20 V regulation and user-programmable fast-charge current (50–500 mA) set by a single resistor from PROG to VSS. Its internal P-channel MOSFET pass transistor features 400 mΩ typical RDS(on) at 105°C and integrates current sensing and thermal regulation to limit die temperature.
It operates across –40°C to +85°C, enters automatic shutdown when VDD falls within +50 mV of VBAT, and draws only 1.2–5 µA in standby (CE = VSS). No preconditioning or automatic end-of-charge termination is supported - charge control is managed externally via CE and PROG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±1% - ensures safe, full capacity charging of standard single-cell Li-ion/LiPo batteries without overvoltage risk. |
| Charge Current Range | 50–500 mA - set precisely via external PROG resistor (2–20 kΩ), enabling optimization for battery capacity and thermal limits. |
| Supply Voltage Range | 3.75–6 V - compatible with 5 V USB sources and regulated wall adapters; UVLO not implemented but automatic power-down activates below VBAT + 10 mV. |
| Thermal Regulation | Active current reduction above ~105°C - maintains reliability during high-power charging without external thermal management components. |
| Package | 5-Lead SOT-23 (OT) - surface-mount, footprint-compatible with industry-standard 2.9 × 1.6 mm PCB area and JEDEC-compliant reflow profiles. |
| Reverse Discharge Protection | <2 µA leakage - prevents battery self-discharge when input power is removed, critical for long shelf-life in portable devices. |
| Standby Current | 1.2–5 µA (CE = VSS) - enables ultra-low-power system sleep modes without battery drain. |
Pinout & Package
5-Lead SOT-23 (OT) package: 2.9 mm × 1.6 mm × 1.15 mm nominal body size, lead pitch 0.95 mm, Pb-free matte tin finish per JEDEC J-STD-609.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Active-high enable input | Logic High (>2 V) initiates charging; Low (<0.8 V) disables device and reduces supply current to ≤5 µA - used for host-controlled charge start/stop. |
| 2 - VSS | Ground reference | Common 0 V node for battery negative terminal, input supply return, and PROG resistor - must be low-impedance for stable regulation. |
| 3 - VBAT | Battery output terminal | Drain of internal P-MOSFET; connects directly to battery positive; requires ≥1 µF ceramic bypass to VSS for loop stability and transient response. |
| 4 - VDD | Input power supply | Accepts 3.75–6 V; powers internal circuitry and supplies charge current; bypassed with ≥1 µF capacitor to VSS near pin. |
| 5 - PROG | Current programming node | Connects to VSS via resistor (2–20 kΩ); sets fast-charge current per IREG = 1000 / RPROG (mA/kΩ) - no digital logic function on this pin for MCP73812. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET pass transistor | Eliminates need for external high-side switch and associated gate drive, reducing BOM count and PCB area in space-constrained designs. |
| Thermal regulation with current foldback | Automatically scales charge current downward as junction temperature rises, preventing thermal runaway without requiring external sensors or feedback loops. |
| No external sense resistor required | Internal current sensing enables accurate 50–500 mA regulation using only one external resistor - simplifies layout and improves accuracy vs. discrete sense solutions. |
| Reverse discharge protection | Blocks battery-to-input leakage under no-input conditions, ensuring <2 µA discharge current - extends battery runtime in always-on or intermittently powered devices. |
| Low quiescent current in standby | Draws only 1.2–5 µA when CE = VSS, making it suitable for battery-backed systems where microamp-level sleep current is mandatory. |
Applications
| USB-Powered Portable Chargers | Bluetooth Audio Accessories |
|---|---|
Use Scenario: Compact USB wall adapter or power bank charging single-cell Li-ion batteries in consumer electronics. IC Role / Device Role / Timing Role: Primary linear charge controller managing CC/CV profile, thermal safety, and input disconnection detection. Use Value: Enables certified 5 V USB compliance with minimal external parts (2 caps + 1 resistor), reducing bill-of-materials cost and board space by >40% vs. discrete solutions. | Use Scenario: Charging Li-ion batteries in wireless earbuds, headsets, or speaker docks with tight thermal and size constraints. IC Role / Device Role / Timing Role: Standalone battery management IC providing precise 4.20 V regulation and programmable current to match battery capacity (e.g., 150–300 mAh cells). Use Value: Delivers ±1% voltage accuracy and thermal foldback to prevent overheating in sealed enclosures, extending product lifetime and meeting UL/IEC safety requirements. |
| Rechargeable IoT Sensors | Electronic Cigarettes |
Use Scenario: Solar- or USB-charged environmental sensors deployed in remote locations with infrequent maintenance. IC Role / Device Role / Timing Role: Battery charge supervisor interfacing with MCU GPIOs for CE control and status monitoring via VBAT voltage. Use Value: Supports host-initiated charge enable/disable and provides stable 4.20 V reference for battery fuel gauging, improving state-of-charge estimation accuracy. | Use Scenario: Disposable or refillable e-cigarette devices requiring reliable, compact, and cost-effective battery charging. IC Role / Device Role / Timing Role: Integrated charger IC handling full CC/CV cycle without firmware intervention - ideal for non-microcontroller-based products. Use Value: Eliminates need for external current-sense resistors and thermal protection ICs, achieving full charging functionality in <2.5 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-420I/OT | Includes integrated thermal regulation, 4.20 V regulation, but uses single-pin PROG for both current setting (via resistor) and status indication; adds charge-complete flag output. | Supports simpler host monitoring (e.g., LED status) without additional GPIOs; higher integration than MCP73812T-420I/OT. | Select when system requires charge-status signaling or tighter thermal control with built-in foldback threshold. |
| BQ24075RGTR | TI part with 4.2 V regulation, 500 mA max current, integrated LDO, and automatic USB/AC adapter detection; requires different PROG resistor scaling (ICHG = 1000/RPROG same equation but different tolerance). | Offers dual-input source selection and integrated power-path management - suited for systems needing seamless input switching. | Choose when USB enumeration or dynamic input source arbitration is required beyond basic linear charging. |
Compared with MCP73831T-420I/OT, the MCP73812T-420I/OT lacks status output but offers identical core charging performance and lower system-level component count; versus BQ24075RGTR, it omits power-path control but provides simpler biasing and smaller footprint for dedicated single-source chargers.
Availability
MCP73812T-420I/OT is available at Aetrix Electronics and suitable for USB-powered portable chargers, Bluetooth audio accessories, rechargeable IoT sensors, and electronic cigarettes requiring stable component supply and consistent parametric performance across production batches.
Supply support for MCP73812T-420I/OT 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 leading provider of microcontrollers, analog devices, and interface ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP738xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/LiPo charging applications - prioritizing minimal external components, thermal robustness, and USB-compliant operation without host processor dependency.
FAQ
What is the exact charge voltage regulation accuracy of the MCP73812T-420I/OT?
The MCP73812T-420I/OT provides factory-trimmed constant-voltage regulation at 4.20 V with a tolerance of ±1.0% over –5°C to +55°C ambient temperature. This specification ensures safe and optimal charging of standard single-cell lithium-ion and lithium-polymer batteries without risking overvoltage stress or capacity loss.
How is the charge current programmed on the MCP73812T-420I/OT?
The MCP73812T-420I/OT uses a single external resistor (RPROG) connected between the PROG pin and VSS to set the fast-charge current. The relationship is IREG = 1000 / RPROG, where RPROG is in kΩ and IREG is in mA - for example, a 2 kΩ resistor yields 500 mA. This method eliminates the need for precision current-sense resistors or DACs.
Does the MCP73812T-420I/OT support automatic end-of-charge termination?
No, the MCP73812T-420I/OT does not implement automatic end-of-charge termination. Charge cycle completion must be managed externally via the CE pin (driven low), removal of input power, or battery disconnection. This design allows full host control but requires system-level supervision for safe cutoff.
What thermal protection mechanisms are built into the MCP73812T-420I/OT?
The MCP73812T-420I/OT features two-tier thermal protection: continuous thermal regulation that progressively reduces charge current above ~105°C junction temperature, and hard thermal shutdown at 150°C with 10°C hysteresis. Both functions operate autonomously without external components, preserving battery and IC reliability under sustained high-power conditions.
Can the MCP73812T-420I/OT be used with input sources other than USB?
Yes, the MCP73812T-420I/OT accepts any DC input between 3.75 V and 6 V, including regulated wall adapters, power banks, or solar charge controllers. Its automatic power-down circuit disables charging when VDD drops within +50 mV of VBAT, preventing reverse current flow - making it robust for variable or intermittent input sources.
MCP73812T-420I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 500mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MCP73812T-420I/OT FAQ
1.How can I place an order for MCP73812T-420I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73812T-420I/OT 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 MCP73812T-420I/OT reliable?
The price and inventory of MCP73812T-420I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73812T-420I/OT is usually 5 days.
3.What payment methods are accepted for MCP73812T-420I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73812T-420I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73812T-420I/OT?
MCP73812T-420I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73812T-420I/OT 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 MCP73812T-420I/OT?
For technical support, including MCP73812T-420I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73812T-420I/OT requirements.
6.How does Aetrix verify that MCP73812T-420I/OT is sourced from the original manufacturer or authorized distributors?
All MCP73812T-420I/OT 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 MCP73812T-420I/OT meets industry standards.
7.What is the process for return or replacement of MCP73812T-420I/OT?
All MCP73812T-420I/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP73812T-420I/OT, 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 MCP73812T-420I/OT part is unused and in its original packaging.
Return procedure for MCP73812T-420I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP73812T-420I/OT Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
