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Microchip Technology MCP73837-FCI/UN
- Part No.:
- MCP73837-FCI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73837-FCI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:765
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Product details
Overview
MCP73837-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, ±0.5% voltage regulation accuracy, 4.20V fixed charge voltage, 100 mA to 1000 mA programmable AC charge current, and integrated reverse discharge protection - used in portable medical devices and ultra-mobile consumer electronics.
For engineers reviewing the MCP73837-FCI/UN datasheet, MCP73837-FCI/UN pinout, MCP73837-FCI/UN application, or MCP73837-FCI/UN equivalent, key selection criteria include its dual-source power arbitration logic, thermal regulation during CC/CV charging, PG (power-good) status output, 10-lead 3 mm × 3 mm DFN package, and factory-set 4.20V regulation for single-cell Li-ion batteries.
Technical Context
The MCP73837-FCI/UN implements autonomous input source selection between VAC and VUSB, prioritizing AC adapter when both are present. Its charge algorithm includes preconditioning, constant-current (CC), constant-voltage (CV), automatic recharge, and thermal regulation based on die temperature.
It features two open-drain status outputs (STAT1, STAT2), a dedicated power-good (PG) output, integrated 50 µA thermistor bias current, and UVLO with 75 mV hysteresis for USB and 55 mV for AC inputs - all operating across –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±0.5% - factory-trimmed for single-cell Li-ion compliance and stable full-charge termination |
| AC Charge Current Range | 15 mA to 1000 mA - set by PROG1 resistor; supports up to 1 A with thermal foldback |
| USB Charge Current Options | 100 mA (low) or 500 mA (high) - selected via PROG2 digital input per USB spec |
| Thermal Regulation Threshold | 150°C die temperature - reduces charge current to prevent overheating without shutdown |
| UVLO Hysteresis | 75 mV (USB), 55 mV (AC) - ensures stable power-up/power-down behavior under noisy supply conditions |
| Supply Voltage Range | VREG + 0.3 V to 6 V - accommodates both 5 V USB and 5–6 V wall adapters |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable medical device environments |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Primary high-current input; dominates over VUSB when both present; requires ≥4.7 µF bypass |
| VUSB | USB port supply input | Fallback power source; compliant with USB 2.0 unit load limits (100/500 mA) |
| STAT1 | Open-drain charge status output | Active-low during charging; high-impedance at completion; drives LED or MCU interrupt |
| STAT2 | Open-drain charge status output | Active-low at charge completion; complements STAT1 for multi-state indication |
| VSS | Ground reference | Common return for battery, inputs, and EP; must connect to PCB ground plane |
| PROG1 | AC charge current programming input | Analog resistor-based setting (1 kΩ–10 kΩ); also enables/disables charging |
| PROG2 | USB charge current selection input | Digital input: low = 100 mA, high = 500 mA; sets precondition/termination ratios |
| PG | Power-good status output | Open-drain indicator of valid input power (VAC or VUSB); unique to MCP73837 variant |
| THERM | Thermistor monitoring input | Biased with 50 µA current; interfaces with NTC thermistors for JEITA-compliant thermal charging |
| VBAT | Battery positive connection | Charging output and battery sense node; requires ≥1 µF bypass for stability |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | Eliminates external power-path MOSFETs and control logic; AC adapter takes priority over USB |
| Integrated reverse discharge protection | Blocks battery-to-input leakage (<2 µA) when input power is removed - no external diode needed |
| Factory-set 4.20V regulation | Meets standard Li-ion cell requirements without external feedback resistors or trimming |
| Thermal regulation with foldback | Reduces charge current above 150°C junction temperature to maintain reliability in compact enclosures |
| Preconditioning enable/disable | Automatically applies trickle charge to deeply depleted cells (<66.5% VREG), configurable via part number |
| Power-good (PG) output | Confirms valid input supply presence - simplifies system power sequencing and host notification |
Applications
| Smartphone Battery Charging | Portable Medical Monitor |
|---|---|
Use Scenario: Charging a 3.7 V, 1200 mAh Li-ion battery from either 5 V USB or 5.2 V wall adapter in space-constrained smartphone design. IC Role / Device Role / Timing Role: Autonomous charge controller managing CC/CV profile, source arbitration, and thermal safety during fast-charge cycles. Use Value: Enables dual-input charging without external FETs or microcontroller intervention; ±0.5% voltage accuracy ensures cell longevity and safety compliance. | Use Scenario: Powering and recharging a handheld ECG monitor with battery backup and USB field-recharge capability. IC Role / Device Role / Timing Role: Single-chip Li-ion charger with thermistor-based temperature monitoring and automatic recharge threshold (94% VREG). Use Value: Supports JEITA-compliant charging profiles and maintains <2 µA reverse discharge in standby - critical for long shelf life and regulatory certification. |
| Bluetooth Headset | Digital Camera |
Use Scenario: Charging a 3.7 V, 180 mAh Li-polymer battery in a compact Bluetooth headset using low-power USB mode. IC Role / Device Role / Timing Role: USB-only charge manager with 100 mA preconditioning and 100 mA fast-charge current, controlled by PROG2 logic level. Use Value: Delivers reliable, low-heat charging in thermally isolated plastic housing; PG output signals host MCU when USB power is valid. | Use Scenario: Recharging a 3.7 V, 800 mAh Li-ion battery in a DSLR accessory grip with AC adapter priority and thermal foldback. IC Role / Device Role / Timing Role: Dual-input charger with 1 A AC current capability, thermal regulation, and automatic end-of-charge termination at 5% IREG. Use Value: Reduces charge time while preventing thermal runaway in high-ambient environments; 3 mm × 3 mm DFN minimizes PCB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-2DCI/OT | Single-input (USB only), no VAC pin, 4.20V fixed, SOT-23-5 package, no PG output | Limited to USB-powered devices; lacks AC adapter support and power-good signaling | Select when board space is critical and only USB charging is required |
| BQ24075RGTR | TI part with 4.20V regulation, 1 A max, but uses different PROG resistor scaling and lacks PG output | No autonomous AC/USB arbitration - requires external logic or host control for source selection | Choose when TI ecosystem compatibility or alternate thermal performance is prioritized |
Compared with MCP73831T-2DCI/OT and BQ24075RGTR, the MCP73837-FCI/UN uniquely integrates autonomous dual-source selection, PG status reporting, and factory-trimmed 4.20V regulation in a 3 mm × 3 mm DFN - reducing BOM count and firmware dependency in portable systems.
Availability
MCP73837-FCI/UN is available at Aetrix Electronics and suitable for smartphone battery charging, portable medical monitors, Bluetooth headsets, and digital camera accessories requiring stable component supply, industrial temperature operation, and dual-input Li-ion charging capability.
Supply support for MCP73837-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 Inc. is a leading provider of microcontrollers, analog components, and battery management ICs, headquartered in Chandler, Arizona.
The MCP738xx family delivers highly integrated, autonomous linear Li-ion chargers optimized for space-constrained portable electronics where minimal external components and guaranteed voltage accuracy are essential.
FAQ
What is the fixed charge voltage of the MCP73837-FCI/UN?
The MCP73837-FCI/UN has a factory-trimmed fixed charge voltage of 4.20 V with ±0.5% tolerance across –40°C to +85°C. This value is not user-adjustable and is specifically calibrated for standard single-cell Li-ion batteries. The MCP73837-FCI/UN datasheet confirms this specification in Section 1.0 Electrical Characteristics under "Regulated Charge Voltage" with typical value 4.20 V and min/max bounds of 4.179 V and 4.221 V.
Does the MCP73837-FCI/UN support both AC adapter and USB charging simultaneously?
No - the MCP73837-FCI/UN performs autonomous source selection: when both VAC and VUSB are present, it automatically selects VAC as the primary power source and disables USB charging. The VAC input dominates with up to 1000 mA charge current capability, while VUSB serves as fallback. This behavior is implemented in hardware and requires no host intervention, as confirmed in the Functional Block Diagram and Section 4.2 of the MCP73837-FCI/UN datasheet.
What is the function of the PG pin on the MCP73837-FCI/UN?
The PG (Power-Good) pin on the MCP73837-FCI/UN is an open-drain output that asserts low when a valid input supply (either VAC ≥ 4.1 V or VUSB ≥ 3.35 V) is detected and UVLO conditions are satisfied. It remains low during active charging and goes high-impedance only if input power drops below UVLO thresholds. This signal enables simple power-status monitoring in host systems without additional sensing circuitry - a feature exclusive to the MCP73837 variant, not present in MCP73838.
How is the AC charge current programmed on the MCP73837-FCI/UN?
The AC charge current on the MCP73837-FCI/UN is programmed using a resistor (RPROG1) connected between the PROG1 pin and VSS. The relationship is IREG ≈ 1000 mA × (1 kΩ / RPROG1), supporting 15 mA to 1000 mA range. For example, a 1 kΩ resistor yields ~1000 mA, while a 10 kΩ resistor yields ~100 mA. This analog programming method is specified in Table 1-1 of the MCP73837-FCI/UN datasheet and validated across temperature.
Is the MCP73837-FCI/UN compatible with thermistor-based temperature monitoring?
Yes - the MCP73837-FCI/UN includes a dedicated THERM pin with an internal 50 µA current source (47–53 µA typical) designed to bias standard 10 kΩ NTC thermistors. It compares the resulting voltage against upper (1.23 V) and lower (0.25 V) thresholds to detect over-temperature and under-temperature faults, enabling JEITA-compliant charging. This functionality is documented in Section 3.10 and Table 1-1 of the MCP73837-FCI/UN datasheet.
MCP73837-FCI/UN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
MCP73837-FCI/UN FAQ
1.How can I place an order for MCP73837-FCI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73837-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 MCP73837-FCI/UN reliable?
The price and inventory of MCP73837-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 MCP73837-FCI/UN is usually 5 days.
3.What payment methods are accepted for MCP73837-FCI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837-FCI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73837-FCI/UN?
MCP73837-FCI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73837-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 MCP73837-FCI/UN?
For technical support, including MCP73837-FCI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837-FCI/UN requirements.
6.How does Aetrix verify that MCP73837-FCI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73837-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 MCP73837-FCI/UN meets industry standards.
7.What is the process for return or replacement of MCP73837-FCI/UN?
All MCP73837-FCI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837-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 MCP73837-FCI/UN part is unused and in its original packaging.
Return procedure for MCP73837-FCI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP73837-FCI/UN Tags
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