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Microchip Technology MCP73833-FCI/UN
- Part No.:
- MCP73833-FCI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73833-FCI/UN.pdf
- Description:
- IC BATT CNTRL LI-ION 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,583
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Product details
Overview
MCP73833-FCI/UN from Microchip Technology is a standalone linear Li-ion/Li-polymer battery charge management controller in a 10-pin DFN-10 (3 mm × 3 mm) package. It delivers 4.20 V ±0.75% constant-voltage regulation, up to 1 A programmable fast-charge current via external PROG resistor, integrated thermal regulation, and dual status outputs (STAT1/STAT2) - designed for USB-powered portable devices requiring precise, space-constrained charging control.
For engineers reviewing the MCP73833-FCI/UN datasheet, MCP73833-FCI/UN pinout, MCP73833-FCI/UN application, or MCP73833-FCI/UN equivalent, key selection considerations include its factory-set 4.20 V regulation voltage, PG (power-good) output functionality (MCP73833 variant), thermistor-based temperature monitoring with 1.23 V / 0.25 V thresholds, and thermal shutdown at 150°C - all validated across –40°C to +85°C ambient operation.
Technical Context
The MCP73833-FCI/UN implements a three-phase linear charging algorithm: preconditioning (trickle charge at 10–100% of IREG), constant-current fast charge (programmable up to 1 A), and constant-voltage regulation (4.20 V ±0.75%). Its internal P-channel MOSFET pass transistor features 300 mΩ typical RDS(on) and integrates reverse discharge protection (<2 µA leakage when VDD < VBAT).
Thermal regulation dynamically reduces charge current above ~105°C junction temperature to maintain reliability, while a dedicated 50 µA thermistor bias current source enables NTC/PTC monitoring with factory-trimmed 1.23 V (upper) and 0.25 V (lower) trip points. The PG output signals valid input power presence above UVLO (3.55 V start threshold, 100 mV hysteresis) and remains low during active charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.20 V ±0.75% - factory-trimmed reference ensures accurate full-charge termination for standard Li-ion cells without external feedback components. |
| Max Fast-Charge Current | 1000 mA - set by 1.0 kΩ PROG-to-VSS resistor; supports rapid charging of single-cell batteries up to 1 Ah capacity. |
| Preconditioning Threshold | 66.5% of VREG (≈2.79 V) - initiates safe trickle charge for deeply depleted cells before fast-charge ramp-up. |
| Thermistor Bias Current | 50 µA ±6% - provides stable excitation for common 10 kΩ NTC thermistors, enabling accurate battery temperature qualification. |
| UVLO Threshold | 3.55 V (±0.15 V) - prevents operation below minimum USB supply voltage; includes 100 mV hysteresis to avoid oscillation during brown-out conditions. |
| Thermal Shutdown | 150°C ±5°C - halts charging immediately upon die overtemperature; resumes after ~140°C cooldown to prevent thermal runaway. |
| Package Thermal Resistance | θJA = 41°C/W (DFN-10) - enables high-power operation in compact layouts with minimal heatsinking requirements. |
Pinout & Package
Package: DFN-10 (3 mm × 3 mm), exposed thermal pad (EP) electrically connected to VSS. Requires soldering EP to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1,2) | Battery management input supply | Accepts 3.75–6 V input; powers internal circuitry and enables charging when >3.55 V; bypass with ≥1 µF capacitor to VSS. |
| STAT1 (Pin 3) | Charge status output | Open-drain indicator: LOW during charging, Hi-Z at end-of-charge; drives LED or microcontroller GPIO. |
| STAT2 (Pin 4) | Charge status output | Open-drain indicator: Hi-Z during charging, LOW at end-of-charge; complements STAT1 for dual-state visual feedback. |
| VSS (Pin 5) | 0 V reference | Common ground for battery negative, input supply return, and exposed thermal pad (EP); mandatory low-impedance connection. |
| PROG (Pin 6) | Current regulation set | Resistor-to-VSS sets fast-charge current (IREG = 1000 V/RPROG); floating disables charging and limits reverse discharge to <2 µA. |
| PG (Pin 7) | Power-good indication | Pseudo open-drain output: LOW when VDD > UVLO threshold and VDD > VBAT; must be pulled up only to VDD. |
| THERM (Pin 8) | Thermistor input | 50 µA bias current source; compares voltage to 1.23 V / 0.25 V thresholds for temperature fault detection. |
| VBAT (Pins 9,10) | Battery charge control output | Drain of internal P-MOSFET; connects directly to battery positive; bypass with ≥1 µF (≤250 mA) or ≥4.7 µF (>250 mA) ceramic capacitor. |
| EP (Pin 11) | Exposed thermal pad | Internally tied to VSS; must be soldered to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pass transistor | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area in space-constrained USB chargers. |
| Programmable preconditioning | Enables safe recovery of deeply discharged Li-ion cells (down to ~2.79 V) using user-selectable current ratios (10–100% of IREG). |
| Automatic recharge threshold | Triggers new charge cycle when battery voltage drops to 94% of VREG (~3.95 V), maintaining optimal state-of-charge without host intervention. |
| System test (LDO) mode | Activates when THERM > (VDD − 100 mV) with no battery; provides regulated 4.20 V output up to programmed IREG, enabling system validation without battery. |
| Reverse discharge protection | Blocks battery-to-input leakage (<2 µA) when VDD is absent or below VBAT, preserving battery life in standby applications. |
Applications
| USB-Powered Portable Devices | Medical Wearables |
|---|---|
Use Scenario: Charging compact electronics (e.g., Bluetooth headsets, digital cameras) directly from USB 2.0 ports with strict 500 mA current limits. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, UVLO, and status signaling without MCU supervision. Use Value: Complies with USB power bus specifications while delivering 4.20 V ±0.75% regulation and automatic end-of-charge termination - eliminating need for host firmware control. | Use Scenario: Powering small, battery-operated diagnostic sensors worn on-body where thermal safety and long shelf life are critical. IC Role / Device Role / Timing Role: Battery charge manager with integrated NTC thermistor interface and automatic temperature-fault suspension. Use Value: Prevents hazardous charging outside 0°C–45°C range using factory-trimmed 1.23 V / 0.25 V thermistor comparators - meeting IEC 62368-1 thermal safety requirements. |
| Industrial Handheld Terminals | Smart Home Sensors |
Use Scenario: Recharging ruggedized barcode scanners or data loggers used in warehouses with intermittent USB docking. IC Role / Device Role / Timing Role: Linear charge controller providing automatic recharge, timer-based safety cutoff, and robust UVLO hysteresis. Use Value: Ensures reliable multi-cycle charging across –40°C to +85°C ambient range with thermal regulation limiting current above 105°C - preventing field failures in uncontrolled environments. | Use Scenario: Enabling maintenance-free operation of battery-powered occupancy/motion sensors deployed for years without service access. IC Role / Device Role / Timing Role: Low-quiescent charger with 100 µA standby current and reverse discharge protection. Use Value: Extends battery life beyond 5 years by limiting VDD-off leakage to <2 µA and supporting automatic recharge at 94% VREG - minimizing deep discharge degradation. |
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 |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2 V regulation, no PG output, 1.5 A max charge current, requires external MOSFET for reverse blocking. | Lacks integrated reverse discharge protection and power-good signaling; needs additional discrete components for same functionality. | Select when higher current (1.5 A) is required and board space allows extra MOSFET + gate driver. |
| MCP73871-2DCI/MS | Same family, MSOP-10 package, identical 4.20 V regulation and PG output, but rated for 500 mA max current (RPROG = 2.0 kΩ). | Lower maximum charge current; suitable for sub-500 mA applications where DFN thermal performance is not required. | Choose for legacy MSOP-10 layout compatibility or lower-current designs where thermal resistance (θJA = 113°C/W) is acceptable. |
Compared with BQ24075RGTR and MCP73871-2DCI/MS, the MCP73833-FCI/UN uniquely combines 1 A capability, integrated reverse blocking, PG output, and DFN-10's superior thermal performance (θJA = 41°C/W) - making it optimal for compact, high-reliability USB-charged devices demanding full feature integration.
Availability
MCP73833-FCI/UN is available at Aetrix Electronics and suitable for USB-powered portable devices, medical wearables, industrial handheld terminals, and smart home sensors requiring stable component supply and long-term production continuity.
Supply support for MCP73833-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, consumer, and communications markets with high-reliability semiconductor products.
The MCP73833-FCI/UN belongs to Microchip's linear battery charge management product line, engineered specifically for cost-sensitive, space-constrained portable electronics that require fully integrated, USB-compliant single-cell Li-ion charging with thermal and safety monitoring.
FAQ
What is the factory-set voltage regulation for MCP73833-FCI/UN?
The MCP73833-FCI/UN has a factory-set constant-voltage regulation of 4.20 V ±0.75%, optimized for standard single-cell Li-ion and Li-polymer batteries. This value is fixed and cannot be adjusted externally - unlike other variants in the MCP73833/4 family offering 4.35 V, 4.40 V, or 4.50 V options. The MCP73833-FCI/UN uses this specific regulation point to ensure precise end-of-charge termination without requiring external voltage dividers or calibration.
Does MCP73833-FCI/UN support thermistor-based temperature monitoring?
Yes, the MCP73833-FCI/UN supports thermistor-based temperature monitoring via its THERM pin, which sources a precise 50 µA ±6% bias current for standard 10 kΩ NTC thermistors. It compares the resulting voltage against factory-trimmed thresholds of 1.23 V (upper) and 0.25 V (lower) to detect out-of-range temperatures. When a fault occurs, the MCP73833-FCI/UN suspends charging, holds the timer, and asserts Hi-Z on STAT1/STAT2 - ensuring compliance with battery safety standards.
How does the PG (Power Good) output function on MCP73833-FCI/UN?
The PG output on MCP73833-FCI/UN is a pseudo open-drain signal that goes LOW when VDD exceeds the UVLO start threshold (3.55 V) and remains above the battery voltage (VBAT). It is not a true power-good monitor of output regulation, but rather an input-supply presence indicator. The MCP73833-FCI/UN requires PG to be pulled up only to VDD (not to another rail) due to an internal diode path. During charging, PG stays LOW; it transitions to Hi-Z only in shutdown or when VDD falls below UVLO.
What is the maximum charge current achievable with MCP73833-FCI/UN?
The MCP73833-FCI/UN supports a maximum fast-charge current of 1000 mA, achieved by connecting a 1.0 kΩ resistor between the PROG pin and VSS. This value is derived from the formula IREG = 1000 V / RPROG (where RPROG is in kΩ). At this setting, the device delivers full 1 A into the battery during constant-current mode, subject to thermal regulation above ~105°C junction temperature - verified in the DS22005B datasheet under "Current Regulation" specifications.
Can MCP73833-FCI/UN operate without a battery connected?
Yes, the MCP73833-FCI/UN can operate in System Test (LDO) mode without a battery. This mode activates when the THERM pin voltage exceeds (VDD − 100 mV) and no battery is present at VBAT. In this state, the MCP73833-FCI/UN regulates VBAT to its factory-set 4.20 V output, sourcing up to the current programmed by the PROG resistor. It is commonly used for system validation, firmware updates, or powering peripherals during development - with stability ensured by ≥4.7 µF output capacitance for loads >250 mA.
MCP73833-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:
- Current
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 1.1A
- 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:
- 10-MSOP
MCP73833-FCI/UN FAQ
1.How can I place an order for MCP73833-FCI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73833-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 MCP73833-FCI/UN reliable?
The price and inventory of MCP73833-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 MCP73833-FCI/UN is usually 5 days.
3.What payment methods are accepted for MCP73833-FCI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73833-FCI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73833-FCI/UN?
MCP73833-FCI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73833-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 MCP73833-FCI/UN?
For technical support, including MCP73833-FCI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73833-FCI/UN requirements.
6.How does Aetrix verify that MCP73833-FCI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73833-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 MCP73833-FCI/UN meets industry standards.
7.What is the process for return or replacement of MCP73833-FCI/UN?
All MCP73833-FCI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73833-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 MCP73833-FCI/UN part is unused and in its original packaging.
Return procedure for MCP73833-FCI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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