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Microchip Technology MCP73837T-FCI/UN
- Part No.:
- MCP73837T-FCI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73837T-FCI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,452
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Product details
Overview
MCP73837T-FCI/UN from Microchip Technology is a fully integrated linear Li-Ion/Li-Polymer battery charge management controller with autonomous AC adapter or USB port source selection. It delivers ±0.5% voltage regulation at 4.20V, supports programmable AC charge current up to 1000 mA via PROG1, and provides dual USB charge current options (100 mA / 500 mA) via PROG2 logic level. It operates across –40°C to +85°C and is used in portable medical devices requiring reliable, thermally regulated charging.
For engineers reviewing the MCP73837T-FCI/UN datasheet, MCP73837T-FCI/UN pinout, MCP73837T-FCI/UN application, or MCP73837T-FCI/UN equivalent, key selection criteria include its 4.20V fixed regulation voltage, 10-lead 3 mm × 3 mm DFN package with exposed thermal pad, integrated reverse discharge protection, thermal regulation with 150°C shutdown, and dual open-drain status outputs (STAT1/STAT2) with Power-Good (PG) monitor.
Technical Context
The MCP73837T-FCI/UN implements a CC/CV charge algorithm with factory-set 4.20V regulation, preconditioning threshold at 66.5% of VREG (≈2.79V), and termination at 5% of fast-charge current. It autonomously selects VAC over VUSB using internal priority logic and employs die-temperature-based current limiting to maintain safe operation under high ambient or power conditions.
Its dual-programmable current architecture separates AC adapter control (PROG1 resistor) from USB port control (PROG2 logic level), while integrated 50 µA THERM bias enables NTC thermistor monitoring. The device includes UVLO with 75 mV hysteresis for USB and 55 mV for AC, automatic power-down when VDD falls within 100 mV of VBAT, and LDO system test mode activated by high THERM voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulated Voltage | 4.20 V ±0.5% - Ensures precise single-cell Li-ion termination without external feedback components. |
| AC Charge Current Range | 15–1000 mA - Set by 1 kΩ–10 kΩ resistor on PROG1; supports wide battery capacity scaling. |
| USB Charge Current Options | 100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - Complies with USB 2.0 unit load definitions. |
| Thermal Shutdown Threshold | 150°C with 10°C hysteresis - Protects IC during sustained high-power charging or poor PCB thermal design. |
| Operating Temperature | –40°C to +85°C ambient - Validated for industrial and portable medical environments. |
| Package Thermal Resistance | θJA = 41°C/W (DFN) - Enables >800 mA continuous charge without external heatsink on standard 4-layer board. |
| Reverse Discharge Leakage | ≤0.55 µA in shutdown - Prevents battery drain when input power is removed. |
Pinout & Package
The MCP73837T-FCI/UN is housed in a 10-lead 3 mm × 3 mm DFN package with exposed thermal pad (EP), internally connected to VSS. The EP must be soldered to a PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Primary high-priority power source; enables up to 1000 mA charge current; requires ≥4.7 µF bypass to VSS. |
| VUSB | USB port supply input | Secondary power source; supports 100/500 mA USB-compliant charging; requires ≥1 µF bypass. |
| STAT1, STAT2 | Open-drain status outputs | Indicate charge state (precondition, CC, CV, complete); require external pull-up for microcontroller interface. |
| PG | Power-Good output (MCP73837 only) | Signals valid input power presence; open-drain, active-low; used for system power sequencing. |
| PROG1 | AC current set & enable input | Resistor-to-VSS sets AC charge current; floating disables charge; >70 kΩ forces shutdown. |
| PROG2 | USB current select input | Digital input: Low = 100 mA, High = 500 mA; also sets USB precondition/termination thresholds. |
| THERM | NTC thermistor monitor | 50 µA bias current; measures battery temperature via voltage divider; triggers thermal fault if out-of-range. |
| VBAT | Battery positive connection | Charge output and battery sensing node; requires ≥1 µF bypass for loop stability when disconnected. |
| VSS | Ground reference | Common return for battery, inputs, and EP; must be low-impedance connection to minimize noise and thermal rise. |
| EP | Exposed thermal pad | Internally tied to VSS; mandatory PCB grounding for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | VAC takes precedence over VUSB without host intervention-enables seamless fallback during adapter disconnection. |
| Integrated reverse discharge protection | Blocks battery-to-input current flow during power removal-eliminates need for external blocking FET or diode. |
| Programmable safety timer (4/6/8 hr) | Prevents indefinite charging under fault conditions-configurable via part number option, not runtime pins. |
| Thermal regulation with foldback | Reduces charge current above ~105°C junction-maintains reliability without hard shutdown during transient overload. |
| Preconditioning disable option | Factory-configured to skip trickle charge for batteries not deeply depleted-reduces charge time in known-good-state applications. |
| LDO system test mode | Enables regulated output from VBAT when THERM > VDD–100 mV-supports battery-less functional testing of downstream circuitry. |
Applications
| Smartphones & PDAs | Portable Medical Devices |
|---|---|
Use Scenario: Charging single-cell Li-ion battery from wall adapter or PC USB port in compact handheld form factor. IC Role / Device Role / Timing Role: Autonomous charge controller managing CC/CV profile, source arbitration, and thermal safety. Use Value: Eliminates need for separate USB/AC detection logic and discrete current-setting resistors-reduces BOM count by ≥4 components. | Use Scenario: Rechargeable battery powering ECG monitors, insulin pumps, or portable ultrasound units with strict safety certification requirements. IC Role / Device Role / Timing Role: Safety-critical battery manager providing preconditioning, temperature monitoring, and automatic end-of-charge cutoff. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced thermal and timer limits-reduces validation effort. |
| Digital Cameras | Bluetooth Headsets |
Use Scenario: Fast-charging high-capacity Li-ion packs in DSLR or mirrorless cameras with dual-input flexibility. IC Role / Device Role / Timing Role: High-current linear charger supporting 1 A AC input and 500 mA USB input with real-time thermal foldback. Use Value: Delivers full charge in <3 hours using AC adapter while maintaining <150°C junction temp-avoids thermal throttling during rapid photo capture sessions. | Use Scenario: Ultra-low-power charging of small Li-polymer cells in wearables with tight space constraints. IC Role / Device Role / Timing Role: Compact 3×3 mm DFN charger with sub-1 µA shutdown leakage and integrated reverse discharge block. Use Value: Extends shelf life to >12 months with ≤0.55 µA discharge current in shutdown-critical for pre-packaged consumer devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2V regulation, 1.5A max AC current, no PG output, 16-pin QFN | Lacks autonomous AC/USB arbitration-requires external logic for source selection | Choose for higher current needs where external control is acceptable and PG signal is unnecessary. |
| MCP73831T-2DCI/OT | Single-input (USB-only), 500 mA max, SOT-23-5, no THERM or PG | No AC adapter support or battery temperature monitoring-suitable only for low-cost USB-only designs | Choose for space-constrained USB-powered accessories where thermal safety and dual-source capability are not required. |
Compared with BQ24075RGTR and MCP73831T-2DCI/OT, the MCP73837T-FCI/UN uniquely integrates autonomous dual-source selection, Power-Good signaling, and NTC thermistor monitoring in a 3×3 mm DFN-making it optimal for certified portable medical and premium consumer devices demanding full hardware safety autonomy.
Availability
MCP73837T-FCI/UN is available at Aetrix Electronics and suitable for smartphones, portable medical devices, digital cameras, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MCP73837T-FCI/UN 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, and Flash-IP solutions, serving automotive, industrial, communications, and consumer markets with high-reliability silicon and development tools.
The MCP73837/8 product line was designed specifically for space-constrained, dual-input portable electronics requiring autonomous, thermally robust Li-ion charging without host processor intervention.
FAQ
What is the fixed regulated charge voltage of the MCP73837T-FCI/UN?
The MCP73837T-FCI/UN has a factory-set regulated charge voltage of 4.20 V with ±0.5% tolerance across –5°C to +55°C. This value is fixed and not adjustable via external components-ensuring consistent, safe termination for standard single-cell Li-ion batteries without calibration overhead.
Does the MCP73837T-FCI/UN support both AC adapter and USB charging simultaneously?
No-the MCP73837T-FCI/UN autonomously selects only one source at a time, with VAC having priority over VUSB. When both are present, it uses the AC adapter and ignores the USB input. Simultaneous sourcing is not supported, preventing backfeed or conflict between supplies.
How is USB charge current selected on the MCP73837T-FCI/UN?
USB charge current on the MCP73837T-FCI/UN is selected via the PROG2 pin: a logic Low configures 100 mA (1 unit load), and a logic High configures 500 mA (5 unit loads). This digital selection eliminates the need for additional resistors and ensures strict compliance with USB 2.0 power specifications.
What thermal protection features does the MCP73837T-FCI/UN include?
The MCP73837T-FCI/UN includes die-temperature-based current foldback starting near 105°C and full thermal shutdown at 150°C with 10°C hysteresis. It also provides a THERM pin with 50 µA bias for external NTC monitoring-enabling dual-layer thermal safety critical for medical and industrial applications.
Is the MCP73837T-FCI/UN pin-compatible with other devices in the MCP73837/8 family?
Yes-the MCP73837T-FCI/UN shares identical pinout and package (10-lead 3×3 mm DFN) with all MCP73837 variants. However, functional differences exist: only MCP73837 parts include the PG output, while MCP73838 parts replace PG with TE (Timer Enable). Always verify datasheet revision and part marking before substitution.
MCP73837T-FCI/UN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 1.1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MCP73837T-FCI/UN FAQ
1.How can I place an order for MCP73837T-FCI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73837T-FCI/UN 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 MCP73837T-FCI/UN reliable?
The price and inventory of MCP73837T-FCI/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73837T-FCI/UN is usually 5 days.
3.What payment methods are accepted for MCP73837T-FCI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837T-FCI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73837T-FCI/UN?
MCP73837T-FCI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73837T-FCI/UN 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 MCP73837T-FCI/UN?
For technical support, including MCP73837T-FCI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837T-FCI/UN requirements.
6.How does Aetrix verify that MCP73837T-FCI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73837T-FCI/UN 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 MCP73837T-FCI/UN meets industry standards.
7.What is the process for return or replacement of MCP73837T-FCI/UN?
All MCP73837T-FCI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837T-FCI/UN, 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 MCP73837T-FCI/UN part is unused and in its original packaging.
Return procedure for MCP73837T-FCI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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