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Microchip Technology MCP73834-FCI/UN
- Part No.:
- MCP73834-FCI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73834-FCI/UN.pdf
- Description:
- IC BATT CNTRL LI-ION 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,211
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Product details
Overview
MCP73834-FCI/UN from Microchip Technology is a stand-alone linear Li-ion/Li-polymer battery charge management controller in MSOP-10 package, featuring 4.20 V ±0.75% constant-voltage regulation, programmable 1 A max fast-charge current via external PROG resistor, integrated P-channel MOSFET pass transistor (300 mΩ typical RDS(on)), and thermal regulation for safe high-power charging in portable USB-powered devices.
For engineers reviewing the MCP73834-FCI/UN datasheet, MCP73834-FCI/UN pinout, MCP73834-FCI/UN application, or MCP73834-FCI/UN equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and two validated alternative parts with documented functional and interface differences - all aligned to DS22005B specifications.
Technical Context
The MCP73834-FCI/UN implements a full CC/CV charge algorithm with factory-set 4.20 V regulation, preconditioning (trickle charge) at 10% of IREG, and automatic termination at 5% IREG. Its TE (Timer Enable) input-exclusive to MCP73834 variants-allows host-controlled activation/deactivation of the internal safety timer (4.0–8.8 hr selectable).
Thermal regulation dynamically reduces charge current above ~105°C junction temperature, while integrated reverse discharge protection limits leakage to ≤2 µA when VDD < VBAT. The device operates across –40°C to +85°C ambient and supports system test (LDO) mode via THERM pin overvoltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREG | 4.20 V ±0.75% - precise cell voltage target for standard Li-ion chemistry; ensures safe full-charge without overvoltage stress. |
| Max Fast-Charge Current | 1000 mA - set by 1.0 kΩ PROG-to-VSS resistor; enables rapid charging of 1000–2000 mAh batteries in under 2 hours. |
| RDS(on) | 300 mΩ (typ.) - low on-resistance of internal P-MOSFET reduces power loss and thermal rise during high-current charge. |
| Preconditioning Ratio | 10% of IREG - safely reactivates deeply discharged cells (<2.5 V) before full-current charging begins. |
| Charge Termination Threshold | 5% of IREG - stops charging when current drops below 50 mA (at 1 A setting); prevents overcharge and extends cycle life. |
| TE Input Logic | Active-low enable - pulls TE low to activate internal safety timer; compatible with 1.8 V logic for low-power host control. |
| Thermal Shutdown | 150°C ±10°C - hard-safety cutoff that halts charging until die cools; independent of thermal regulation loop. |
Pinout & Package
MSOP-10 package (3.0 mm × 4.9 mm × 1.1 mm), exposed pad electrically tied to VSS; requires solder connection to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 2) | Battery management input supply | Dual-input configuration accepts 3.75–6 V; UVLO activates at 3.55 V (±0.15 V) with 100 mV hysteresis to prevent oscillation. |
| STAT1 / STAT2 (Pins 3, 4) | Open-drain charge status outputs | STAT1 = LOW during active charge; STAT2 = LOW at end-of-charge; both Hi-Z in shutdown - enables dual-LED or microcontroller status polling. |
| VSS (Pin 5) | 0 V reference | Common return for battery negative, input supply, PROG resistor, and exposed thermal pad - mandatory star-ground connection point. |
| PROG (Pin 6) | Current regulation set & enable | Resistor value (1–20 kΩ) sets fast-charge current per IREG = 1000 V/RPROG; floating disables charger and cuts reverse leakage to ≤2 µA. |
| TE (Pin 7) | Timer Enable input | MCP73834-exclusive function: low = enable safety timer (4–8.8 hr); high = disable timer - critical for systems with external charge supervision. |
| THERM (Pin 8) | NTC thermistor bias & monitoring | 50 µA current source drives 10 kΩ NTC; compares voltage to 1.23 V (hot) and 0.25 V (cold) thresholds - suspends charge on out-of-range temp. |
| VBAT (Pins 9, 10) | Battery charge control output | Drain of internal P-MOSFET; connects directly to battery anode; requires ≥1 µF ceramic bypass capacitor for stability with disconnected battery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-MOSFET pass transistor | Eliminates external high-side switch and current-sense resistor - reduces BOM count and PCB area in space-constrained designs. |
| Factory-programmed 4.20 V regulation | Meets JEITA-compliant Li-ion charging without external feedback resistors - simplifies design validation and production calibration. |
| Programmable safety timer with TE control | Enables host MCU to override or disable timer based on battery state or system load - avoids premature charge termination during mixed-use scenarios. |
| System Test (LDO) mode | Converts charger into 4.20 V LDO when THERM > (VDD − 100 mV) - powers system without battery for factory testing or backup operation. |
| Reverse discharge protection | Blocks battery-to-input leakage ≤2 µA when VDD is absent - preserves battery charge during storage or unplugged operation. |
Applications
| USB-Powered Portable Devices | Wearable Health Monitors |
|---|---|
Use Scenario: Charging compact Bluetooth earbuds or smartwatches via USB 2.0 port with strict 500 mA current limit. IC Role / Device Role / Timing Role: Stand-alone linear charger managing CC/CV profile, thermal foldback, and USB compliance without host intervention. Use Value: Enables single-chip solution meeting USB-IF voltage regulation (±0.75%) and current accuracy (±10%) requirements - eliminates need for external sense amp or DAC. |
Use Scenario: Recharging small-form-factor pulse oximeters or glucose meters using coin-cell–sized Li-polymer batteries. IC Role / Device Role / Timing Role: Battery manager providing preconditioning for deep-discharge recovery, NTC-based temperature safety, and automatic recharge after partial discharge. Use Value: Guarantees safe charging down to 2.3 V battery voltage and prevents thermal runaway via dual-threshold thermistor monitoring - critical for medical-grade reliability. |
| Industrial Handheld Terminals | Bluetooth Headsets |
Use Scenario: Powering ruggedized barcode scanners or RFID readers with extended runtime and field-replaceable Li-ion packs. IC Role / Device Role / Timing Role: Charge controller with TE-pin host coordination to pause charging during high-CPU activity and resume post-idle. Use Value: Prevents thermal throttling during simultaneous charging and data transmission - maintains consistent system performance and battery longevity. |
Use Scenario: Enabling rapid top-up charging (≤30 min) for true wireless stereo (TWS) earbuds with 50–100 mAh batteries. IC Role / Device Role / Timing Role: Linear charger delivering precise 4.20 V CV and 1 A CC with 5% termination threshold to maximize usable capacity. Use Value: Achieves >95% depth-of-discharge utilization while maintaining cycle life >500 cycles - directly improves consumer product lifetime. |
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 |
|---|---|---|---|
| MCP73833-FCI/UN | Includes PG (Power Good) output instead of TE; no host timer control; same 4.20 V regulation and 1 A capability. | Suitable for fixed-timer applications where power-good signaling to host is required (e.g., USB hub chargers). | Select when system needs PG indication and does not require dynamic timer enable/disable - no firmware changes needed. |
| BQ24075RGTR | TI part with 4.2 V regulation, 1.5 A max, but lacks TE input and uses different thermistor bias (10 µA vs. 50 µA); requires external MOSFET. | Used in cost-sensitive consumer electronics where higher current and simpler layout outweigh missing TE functionality. | Choose when higher charge current (1.5 A) is mandatory and host timer control is unnecessary - verify thermistor compatibility and layout impact. |
Compared with MCP73833-FCI/UN, the MCP73834-FCI/UN trades PG output for TE control - enabling adaptive safety timing in host-managed systems; versus BQ24075RGTR, it integrates the pass FET and provides tighter thermistor bias accuracy, reducing external component count and improving temperature fault resolution.
Availability
MCP73834-FCI/UN is available at Aetrix Electronics and suitable for USB-powered portable devices, wearable health monitors, industrial handheld terminals, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP73834-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad industrial, automotive, and consumer market presence.
The MCP73833/4 family was designed specifically for space-constrained, cost-sensitive Li-ion/Li-polymer charging in portable electronics - emphasizing integration, USB compliance, and robust thermal safety without external components.
FAQ
What is the exact regulated output voltage of the MCP73834-FCI/UN?
The MCP73834-FCI/UN is factory-programmed for 4.20 V constant-voltage regulation with a tolerance of ±0.75% (4.168 V to 4.232 V at +25°C). This value is fixed and cannot be adjusted externally - it matches JEITA standards for standard Li-ion cells and is confirmed in Section 1.0 of DS22005B.
How does the TE pin on the MCP73834-FCI/UN differ from the PG pin on the MCP73833-FCI/UN?
The TE (Timer Enable) pin on the MCP73834-FCI/UN is an active-low digital input that enables or disables the internal safety timer; the PG (Power Good) pin on the MCP73833-FCI/UN is an open-drain output indicating valid input supply. These are mutually exclusive functions - MCP73834-FCI/UN does not include PG, and MCP73833-FCI/UN does not support TE.
Can the MCP73834-FCI/UN charge a battery while simultaneously powering a system load?
Yes - the MCP73834-FCI/UN supports supply-path management: when VDD is present, it powers both the battery and system load through the VBAT node. During charging, the internal P-MOSFET regulates current to the battery while excess current supplies the load - confirmed in the Functional Block Diagram and Section 4.0 of DS22005B.
What is the minimum PROG resistor value required to achieve 1 A fast-charge current with the MCP73834-FCI/UN?
The minimum PROG resistor value is 1.0 kΩ, which sets the fast-charge current to 1000 mA per Equation 4-1 (IREG = 1000 V / RPROG). DS22005B specifies this as the maximum supported current; using <1.0 kΩ risks exceeding IMAX (1200 mA limit) and triggering thermal regulation or instability.
Does the MCP73834-FCI/UN support thermistor-based temperature monitoring, and what is the bias current?
Yes - the MCP73834-FCI/UN includes a dedicated THERM pin with a precision 50 µA (47–53 µA) current source for biasing standard 10 kΩ NTC thermistors. It compares the resulting voltage against factory-set thresholds (1.23 V and 0.25 V) to suspend charging outside safe temperature ranges - detailed in Section 3.7 and Table 1-1 of DS22005B.
MCP73834-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
MCP73834-FCI/UN FAQ
1.How can I place an order for MCP73834-FCI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73834-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 MCP73834-FCI/UN reliable?
The price and inventory of MCP73834-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 MCP73834-FCI/UN is usually 5 days.
3.What payment methods are accepted for MCP73834-FCI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73834-FCI/UN transactions.
Note: Certain payment methods may incur a processing fee.
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MCP73834-FCI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73834-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 MCP73834-FCI/UN?
For technical support, including MCP73834-FCI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73834-FCI/UN requirements.
6.How does Aetrix verify that MCP73834-FCI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73834-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 MCP73834-FCI/UN meets industry standards.
7.What is the process for return or replacement of MCP73834-FCI/UN?
All MCP73834-FCI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73834-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 MCP73834-FCI/UN part is unused and in its original packaging.
Return procedure for MCP73834-FCI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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