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Microchip Technology MCP73837-FCI/MF
- Part No.:
- MCP73837-FCI/MF
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP73837-FCI/MF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,966
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Product details
Overview
MCP73837-FCI/MF 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 4.20 V, supports programmable AC charge current up to 1000 mA via PROG1 resistor, and includes dual open-drain status outputs (STAT1/STAT2) and Power-Good (PG) output. It is used in portable medical devices and ultra-mobile consumer electronics requiring dual-source charging with thermal regulation.
For engineers reviewing the MCP73837-FCI/MF datasheet, MCP73837-FCI/MF pinout, MCP73837-FCI/MF application, or MCP73837-FCI/MF equivalent, key selection criteria include its 4.20 V fixed regulation voltage, 10-lead 3 mm × 3 mm DFN package with exposed thermal pad, integrated reverse discharge protection, battery temperature monitoring via THERM pin, and compliance with USB 2.0 current limits (100 mA / 500 mA).
Technical Context
The MCP73837-FCI/MF implements a CC/CV charge algorithm with factory-set 4.20 V regulation, preconditioning for deeply depleted cells, and automatic recharge triggered at 94% of VREG. Its autonomous power source selector prioritizes VAC over VUSB and enforces UVLO thresholds of 3.45 V (USB) and 4.15 V (AC) with hysteresis.
Thermal regulation dynamically reduces charge current above die temperature of 150°C (shutdown) with 10°C hysteresis, while the integrated 50 µA thermistor bias current supports standard 10 kΩ NTC sensors. The device operates across –40°C to +85°C ambient and features LDO mode for system test via THERM pin assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 4.20 V ±0.5% - precise termination threshold for single-cell Li-ion batteries. |
| AC Charge Current Range | 95–1100 mA - set by 1 kΩ–10 kΩ PROG1 resistor; enables flexible fast-charge design. |
| USB Charge Current Options | 90 mA (low) or 450 mA (high) - compliant with USB 2.0 unit load definitions. |
| Thermal Shutdown Threshold | 150°C - protects IC and battery under high-power or poor-PCB thermal conditions. |
| UVLO Threshold (AC) | 4.15 V ±0.15 V - prevents operation below safe input voltage; 55 mV hysteresis avoids oscillation. |
| Package | 10-Lead 3 mm × 3 mm DFN with exposed thermal pad - achieves θJA = 41°C/W for efficient heat dissipation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable medical environments. |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS. Requires PCB thermal pad connection to ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Primary power source; dominates USB when both present; requires ≥4.7 µF bypass capacitor. |
| VUSB | USB port supply input | Secondary power source; supplies 100 mA or 500 mA based on PROG2 logic level. |
| STAT1 | Charge status output 1 | Open-drain indicator: active-low during charging, high-Z at completion. |
| STAT2 | Charge status output 2 | Open-drain indicator: high-Z during charge, active-low at completion. |
| VSS | Battery and supply ground reference | Common return for battery, inputs, and EP; must tie to exposed thermal pad. |
| PROG1 | AC charge current programming | Resistor-to-VSS sets ICHG (95–1100 mA); also enables/disables charge control. |
| PROG2 | USB charge current selection | Digital input: low = 1-unit load (90 mA), high = 5-unit load (450 mA). |
| PG | Power-Good status output | Open-drain output active-low when valid input power is detected (MCP73837 only). |
| THERM | Battery temperature monitor | Biased with 50 µA internal current; interfaces to NTC thermistor for thermal safety cutoff. |
| VBAT | Battery positive terminal | Charging output and battery sense node; requires ≥1 µF bypass for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | VAC takes priority over VUSB without host intervention-reduces firmware complexity in portable systems. |
| Integrated reverse discharge protection | Blocks battery-to-input leakage (<0.55 µA shutdown, <2 µA UVLO) - eliminates need for external blocking diode. |
| Programmable safety timer | Configurable 4/6/8-hour timeout prevents overcharge during fault conditions - enhances battery safety certification. |
| Preconditioning enable/disable | Factory-set 66.5% VREG threshold allows safe trickle-charge of deeply discharged cells before CC mode. |
| Thermal regulation with foldback | Reduces ICHG linearly above 125°C - maintains charge progress while preventing thermal runaway. |
Applications
| Smartphones & PDAs | Portable Medical Devices |
|---|---|
Use Scenario: Compact handheld with dual-input charging (wall adapter + PC USB) and strict battery safety requirements. IC Role / Device Role / Timing Role: Primary linear charger managing CC/CV profile, source arbitration, and thermal cutoff. Use Value: Eliminates discrete MOSFETs and external current-sense resistors; reduces BOM count by ≥4 components vs. discrete solution. | Use Scenario: Battery-powered glucose meter or pulse oximeter requiring FDA-compliant charge supervision and low standby current. IC Role / Device Role / Timing Role: Autonomous charge controller with battery temperature monitoring and automatic recharge at 94% VREG. Use Value: Meets IEC 62304 Class B software safety requirements via hardware-enforced thermal and timer safeguards. |
| Ultra-Mobile Devices (UMD) | Digital Cameras |
Use Scenario: Sub-100g wearable with space-constrained PCB and need for rapid 1 A charging from AC source. IC Role / Device Role / Timing Role: High-efficiency linear charger with 41°C/W thermal resistance enabling full-rate charge in thin form factor. Use Value: Achieves >92% efficiency at 1 A/4.2 V with no inductor or EMI filtering - simplifies EMC validation. | Use Scenario: DSLR or mirrorless camera using removable Li-ion pack and requiring reliable USB fallback charging. IC Role / Device Role / Timing Role: Dual-path charger supporting simultaneous USB-hosted firmware updates and battery top-off. Use Value: PG output signals valid input power to camera MCU, enabling safe peripheral enumeration during charging. |
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 |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2 V regulation, no PG output, 1.5 A max AC current, no autonomous source selection - requires external logic for VAC/VUSB arbitration. | Lacks integrated power-good monitoring and dual-source priority logic - demands additional GPIO and firmware. | Select when higher AC current (>1 A) is required and host MCU can manage source arbitration. |
| TP4056 | Single-source (micro-USB only), no VAC input, no PG or THERM pins, 1 A max, no preconditioning - minimal feature set. | Suitable only for cost-sensitive USB-only chargers without thermal or safety timer requirements. | Select for ultra-low-cost, non-medical, USB-only applications where safety certifications are not mandated. |
Compared with BQ24075RGTR and TP4056, the MCP73837-FCI/MF provides unique integration of autonomous AC/USB selection, Power-Good signaling, and factory-trimmed 4.20 V regulation - reducing system-level validation effort for dual-input portable designs.
Availability
MCP73837-FCI/MF is available at Aetrix Electronics and suitable for smartphones & PDAs, portable medical devices, and ultra-mobile devices requiring stable component supply, long-term lifecycle support, and automotive-grade reliability screening.
Supply support for MCP73837-FCI/MF 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, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona.
The MCP73837-FCI/MF belongs to Microchip's advanced standalone Li-ion charge management product line, designed specifically for space-constrained portable electronics needing autonomous dual-source charging with hardware-enforced safety.
FAQ
What is the exact regulated charge voltage of the MCP73837-FCI/MF?
The MCP73837-FCI/MF has a factory-trimmed constant-voltage regulation point of 4.20 V with ±0.5% tolerance across –5°C to +55°C. This value is confirmed in Section 1.0 Electrical Characteristics of DS20002071C, where VREG is specified as 4.179 V (min), 4.20 V (typ), and 4.221 V (max) under defined test conditions. The MCP73837-FCI/MF does not support user-selectable voltage options - it is the 4.20 V variant of the MCP73837 family.
Does the MCP73837-FCI/MF support thermal regulation and how is it implemented?
Yes, the MCP73837-FCI/MF implements thermal regulation by reducing charge current when die temperature exceeds ~125°C, with full thermal shutdown at 150°C (±5°C) and 10°C hysteresis. This is achieved via an internal thermal sensor and analog foldback circuit - no external components or host intervention required. The MCP73837-FCI/MF's 3 mm × 3 mm DFN package with exposed pad achieves θJA = 41°C/W, enabling sustained 1 A operation in typical 4-layer PCB layouts. This behavior is documented in the Functional Block Diagram and Thermal Shutdown section of DS20002071C.
How does the MCP73837-FCI/MF handle power source arbitration between VAC and VUSB?
The MCP73837-FCI/MF performs fully autonomous power source selection: VAC input takes absolute priority over VUSB. When both are present, the device draws from VAC and ignores VUSB. If VAC is removed, it seamlessly transitions to VUSB without interruption. This is implemented in hardware via internal comparators and direction control logic - no firmware or external logic is needed. The MCP73837-FCI/MF also enforces USB 2.0 current limits (100 mA or 500 mA) based on PROG2 state, as verified in the "Autonomous Power Source Selection" section of DS20002071C.
What is the function of the PG pin on the MCP73837-FCI/MF and how is it used?
The PG (Power-Good) pin on the MCP73837-FCI/MF is an open-drain output that asserts low when a valid input supply (VAC or VUSB) is detected above its respective UVLO threshold - indicating stable power is available for system operation. It is electrically identical to STAT1/STAT2 but serves a distinct system-level purpose: enabling host MCU power sequencing or peripheral enumeration. PG is exclusive to the MCP73837 series (not MCP73838); the MCP73837-FCI/MF includes this pin per its part number suffix and Pin Function Table in DS20002071C.
Can the MCP73837-FCI/MF be used with lithium-polymer batteries?
Yes, the MCP73837-FCI/MF is explicitly qualified for both Li-Ion and Li-Polymer single-cell batteries, as stated in the device description and Applications section of DS20002071C. Its 4.20 V regulation voltage matches the standard full-charge threshold for most commercial Li-Po cells, and its CC/CV algorithm, preconditioning, and automatic recharge behavior are equally applicable. The datasheet confirms compatibility across the full operating temperature range (–40°C to +85°C) and specifies battery voltage monitoring directly at the VBAT pin - ensuring accurate termination regardless of chemistry-specific impedance effects.
MCP73837-FCI/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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-DFN (3x3)
MCP73837-FCI/MF FAQ
1.How can I place an order for MCP73837-FCI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73837-FCI/MF 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/MF reliable?
The price and inventory of MCP73837-FCI/MF 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/MF is usually 5 days.
3.What payment methods are accepted for MCP73837-FCI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837-FCI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73837-FCI/MF?
MCP73837-FCI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73837-FCI/MF 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/MF?
For technical support, including MCP73837-FCI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837-FCI/MF requirements.
6.How does Aetrix verify that MCP73837-FCI/MF is sourced from the original manufacturer or authorized distributors?
All MCP73837-FCI/MF 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/MF meets industry standards.
7.What is the process for return or replacement of MCP73837-FCI/MF?
All MCP73837-FCI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837-FCI/MF, 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/MF part is unused and in its original packaging.
Return procedure for MCP73837-FCI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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