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Microchip Technology MCP73862T-I/ML
- Part No.:
- MCP73862T-I/ML
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MCP73862T-I/ML.pdf
- Description:
- IC BATT CONTRL LI-ION 2CEL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,434
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Product details
Overview
MCP73862T-I/ML from Microchip Technology is a dual-cell linear lithium-ion/polymer battery charge management controller with integrated P-channel MOSFET pass transistor, current sensing, and reverse-blocking protection. It delivers 8.2V or 8.4V regulated output (selectable via VSET), supports up to 1.2A fast-charge current, features programmable safety timers, preconditioning for deeply depleted cells, and operates across –40°C to +85°C. It is used in cradle chargers and dual-cell portable instrumentation.
For engineers reviewing the MCP73862T-I/ML datasheet, MCP73862T-I/ML pinout, MCP73862T-I/ML application, or MCP73862T-I/ML equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative parts for dual-series Li-ion charging designs requiring thermal regulation, automatic recharge, and LED status indication.
Technical Context
The MCP73862T-I/ML implements a fully autonomous linear charging algorithm with three distinct phases: preconditioning (trickle-charge at ~10% of IREG when VBAT < VPTH), constant-current fast charge (regulated by PROG resistor), and constant-voltage regulation (set to 8.2V or 8.4V via VSET logic level). All phases are governed by independent safety timers (precondition, fast-charge, elapsed-time termination) and continuously monitored qualification checks including UVLO, temperature window (via THERM/THREF), and EN state.
Thermal regulation dynamically scales charge current above ~100°C to prevent die overheating, while thermal shutdown suspends charging at 155°C with 10°C hysteresis. The device uses internal voltage references (1.2V bias, 2.55V THREF) and precision comparators for VREG accuracy (±0.5%), line/load regulation (<0.25%/V and <0.25%), and PSRR up to 60 dB at 1 kHz - critical for stable charging under noisy input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 8.2V or 8.4V ±0.5% - selectable via VSET pin; enables safe charging of dual-series Li-ion/Li-Po packs with coke or graphite anodes. |
| Max Fast-Charge Current | 1.2A - set by PROG-to-VSS connection; supports high-capacity portable devices without external current-sense resistors. |
| Input Voltage Range | 8.7V to 12V - ensures compatibility with standard 9–12V wall adapters and prevents operation below dual-cell minimum safe input. |
| Precondition Threshold | 5.4V–5.9V - triggers trickle-charge for deeply discharged dual-cell batteries, preventing damage during recovery. |
| Charge Termination Current | 6–120mA - scales with IREG (≈8% of fast-charge current); enables precise end-of-charge detection without host MCU intervention. |
| Operating Temperature | –40°C to +85°C - specified ambient range; supports industrial and automotive accessory applications with extended thermal margins. |
| Package | 16-pin 4×4 mm QFN (ML suffix) - thermally enhanced surface-mount package with exposed pad tied to VSS for efficient heat dissipation. |
Pinout & Package
Package: 16-pin, 4 mm × 4 mm QFN with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSET (Pin 1) | Voltage regulation selection | Logic-level input: tie to VSS for 8.2V regulation, VDD for 8.4V; configures charge profile for specific cell chemistry and pack configuration. |
| VDD1/VDD2 (Pins 2,3) | Battery management input supply | Primary power input (8.7–12V); dual pins reduce trace resistance and improve current handling; requires ≥4.7 µF bypass to VSS. |
| VSS1/VSS2/VSS3 (Pins 4,9,13) | Ground reference | Common 0V return for battery negative, input supply, and internal circuitry; multiple pins minimize ground bounce in high-current paths. |
| PROG (Pin 5) | Current regulation set | Analog programming input: resistor to VSS sets fast-charge (IREG), precondition (IPREG), and termination (ITERM) currents simultaneously. |
| THREF (Pin 6) | Thermistor reference bias | 2.55V ±3% precision reference output; supplies bias current to external NTC/PTC thermistor for continuous temperature monitoring. |
| THERM (Pin 7) | Temperature sensor input | Analog comparator input monitoring thermistor divider; triggers charge suspension if cell temperature exceeds VT1 (1.25V) or falls below VT2 (0.62V). |
| TIMER (Pin 8) | Safety timer capacitor connection | Connects to 0.1 µF capacitor to scale all internal timers (precondition, fast-charge, elapsed-time termination) proportionally. |
| VBAT1/VBAT2 (Pins 10,11) | Battery charge control output | Drain terminals of internal P-MOSFET pass transistors; connect directly to battery positive; require ≥4.7 µF ceramic output capacitance. |
| VBAT3 (Pin 12) | Battery voltage sense | High-impedance feedback node; internal resistor divider regulates VBAT3 to VREG, enabling accurate closed-loop voltage control independent of trace resistance. |
| EN (Pin 14) | Logic enable | Active-high digital input: forces charge start/stop, clears faults, or disables automatic recharge; threshold VIH = 1.4V, VIL = 0.8V. |
| STAT2 (Pin 15) | Fault status output | Open-drain, current-limited (4–12 mA) output; sinks current to drive LED or microcontroller interrupt; asserts low on fault (UVLO, overtemp, timer expiry). |
| STAT1 (Pin 16) | Charge status output | Open-drain, current-limited (4–12 mA) output; flashes during active charge (MCP73862), turns off at completion (MCP73864); supports direct LED indication. |
| EP (Exposed Pad) | Thermal & electrical ground | Internally connected to VSS; must be soldered to PCB copper pour for thermal conduction and low-impedance grounding; improves θJA to 47°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET pass transistor | Eliminates need for external high-side switch and associated gate-drive circuitry; reduces BOM count and layout area in space-constrained chargers. |
| Reverse-blocking protection | Prevents battery discharge back into the input supply when VDD is removed; avoids parasitic drain in cradle or docked applications. |
| Automatic preconditioning with 5–180 mA trickle-charge | Safely recovers deeply depleted dual-cell packs (VBAT < 5.4V) before full-rate charging, reducing risk of lithium plating and thermal runaway. |
| Programmable safety timers (precondition, fast-charge, elapsed-time) | Prevents indefinite charging under fault conditions; timer scaling via single CTIMER capacitor simplifies design and improves repeatability. |
| Continuous cell temperature monitoring with dual-threshold comparators | Enables real-time thermal qualification using low-cost NTC thermistors; upper/lower trip points (1.25V/0.62V) provide hysteresis for stable operation. |
| Charge status and fault outputs with LED drive capability | Direct-drive open-drain outputs eliminate external driver transistors; STAT1 flashing pattern indicates charge progress, STAT2 latching indicates fault type. |
Applications
| Cradle Charger | Dual-Cell Portable Instrumentation |
|---|---|
|
Use Scenario: Desktop docking station for handheld test equipment with removable dual-cell Li-ion battery pack. IC Role / Device Role / Timing Role: Primary charge controller managing full CC/CV cycle, preconditioning, thermal monitoring, and status indication without host MCU involvement. Use Value: Enables compact, self-contained cradle design with automatic charge initiation on dock, LED status feedback, and overtemperature shutdown at 155°C. |
Use Scenario: Battery-powered oscilloscope or multimeter requiring >16 Wh capacity and field-replaceable dual-series Li-ion pack. IC Role / Device Role / Timing Role: Standalone linear charger providing 8.4V regulation, 1.2A fast charge, and precise 8% ITERM termination for consistent runtime calibration. Use Value: Delivers ±0.5% voltage accuracy and <0.25% load regulation to maintain stable analog front-end performance during charging. |
| Industrial Hand-Held Scanner | Medical Point-of-Care Monitor |
|
Use Scenario: Rugged barcode scanner used in warehouse environments with frequent hot-swap battery operations. IC Role / Device Role / Timing Role: Charge manager enforcing UVLO lockout (8.4–9.05V), reverse-blocking, and automatic recharge when VBATT drops to VRTH (VREG − 400 mV). Use Value: Prevents false starts during marginal input conditions and ensures reliable re-engagement after brief power interruptions. |
Use Scenario: Portable ECG or SpO₂ monitor requiring FDA-compliant battery management with thermal fault logging and fail-safe termination. IC Role / Device Role / Timing Role: Safety-critical charge controller implementing dual-threshold thermistor monitoring (VT1/VT2), elapsed-time termination (2.2–3.8 hrs), and latched STAT2 fault reporting. Use Value: Meets IEC 62368-1 thermal safety requirements through hardware-enforced temperature limits and non-volatile fault signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-cell Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24103ARHLR | Switch-mode (buck) architecture; 8.4V output; 1.5A max charge current; requires external MOSFETs and inductor; no integrated PROG-based current scaling. | Higher efficiency (>85%) in high-input-voltage scenarios; unsuitable for ultra-low-noise analog systems due to switching noise. | Select for thermally constrained or high-efficiency applications where inductor size and EMI are acceptable trade-offs. |
| LTC4065EDD-8.4 | Linear architecture; 8.4V fixed output; 1A max charge current; no VSET option; integrated thermal regulation but no THERM/THREF interface. | Lacks programmable voltage selection and external thermistor monitoring; simpler implementation but less flexible for multi-chemistry support. | Select for cost-sensitive, fixed-chemistry dual-cell designs where temperature monitoring is handled externally or omitted. |
Compared with BQ24103ARHLR and LTC4065EDD-8.4, the MCP73862T-I/ML uniquely combines VSET-selectable 8.2V/8.4V regulation, integrated thermistor interface with ratio-metric thresholds, and PROG-based simultaneous scaling of fast/precondition/termination currents - enabling one-chip adaptation across dual-cell Li-ion chemistries and thermal safety requirements.
Availability
MCP73862T-I/ML is available at Aetrix Electronics and suitable for cradle chargers, dual-cell portable instrumentation, industrial hand-held scanners, and medical point-of-care monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MCP73862T-I/ML 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 leading provider of microcontrollers, analog components, and battery management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP7386X family was designed specifically for space-limited, cost-sensitive linear charging applications requiring high accuracy, integrated safety features, and minimal external components - targeting consumer, industrial, and medical portable electronics.
FAQ
What is the function of the VSET pin on the MCP73862T-I/ML?
The VSET pin on the MCP73862T-I/ML selects the regulated output voltage: tying VSET to VSS configures the device for 8.2V regulation, while tying it to VDD selects 8.4V. This allows a single part number to support dual-series Li-ion packs with different anode chemistries (coke or graphite) without changing the PCB layout or firmware.
How does the MCP73862T-I/ML handle thermal regulation during charging?
The MCP73862T-I/ML dynamically reduces charge current when die temperature exceeds ~100°C, maintaining reliability without terminating the charge cycle. Thermal regulation is implemented in hardware using on-die temperature sensors, and the internal safety timers automatically slow down to prevent premature timeout during thermal throttling.
Can the MCP73862T-I/ML be used for single-cell Li-ion charging?
No - the MCP73862T-I/ML is specifically designed for dual-series Li-ion/Li-polymer battery packs, with input voltage range (8.7–12V) and regulation options (8.2V/8.4V) optimized for two cells in series. For single-cell applications, Microchip's MCP73861/3 family (4.1V/4.2V) is the appropriate counterpart.
What is the purpose of the exposed pad (EP) on the MCP73862T-I/ML QFN package?
The exposed pad (EP) on the MCP73862T-I/ML is internally connected to VSS and serves as both a thermal dissipation path and a low-inductance ground connection. It must be soldered to a PCB copper pour to achieve the specified θJA of 47°C/W and ensure stable operation under 1.2A charge current.
How does the MCP73862T-I/ML indicate charge status and faults?
The MCP73862T-I/ML uses two open-drain outputs: STAT1 flashes during active charging (MCP73862) and turns off at completion, while STAT2 pulls low during faults (UVLO, overtemperature, timer expiry). Both support direct LED drive or microcontroller interfacing with pull-up resistors, eliminating need for external drivers.
MCP73862T-I/ML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- 1.38A
- Battery Pack Voltage:
- 8.4V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
MCP73862T-I/ML FAQ
1.How can I place an order for MCP73862T-I/ML through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73862T-I/ML 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 MCP73862T-I/ML reliable?
The price and inventory of MCP73862T-I/ML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73862T-I/ML is usually 5 days.
3.What payment methods are accepted for MCP73862T-I/ML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73862T-I/ML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73862T-I/ML?
MCP73862T-I/ML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73862T-I/ML 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 MCP73862T-I/ML?
For technical support, including MCP73862T-I/ML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73862T-I/ML requirements.
6.How does Aetrix verify that MCP73862T-I/ML is sourced from the original manufacturer or authorized distributors?
All MCP73862T-I/ML 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 MCP73862T-I/ML meets industry standards.
7.What is the process for return or replacement of MCP73862T-I/ML?
All MCP73862T-I/ML units undergo pre-shipment inspection (PSI). If there is an issue with MCP73862T-I/ML, 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 MCP73862T-I/ML part is unused and in its original packaging.
Return procedure for MCP73862T-I/ML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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