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Microchip Technology MCP73838-FJI/UN
- Part No.:
- MCP73838-FJI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73838-FJI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
MCP73838-FJI/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, thermal regulation, and timer enable (TE) pin for safety timer control. It delivers up to 1000 mA AC charge current and supports 100/500 mA USB charge profiles in portable medical devices and ultra-mobile electronics.
For engineers reviewing the MCP73838-FJI/UN datasheet, MCP73838-FJI/UN pinout, MCP73838-FJI/UN application, or MCP73838-FJI/UN equivalent, this page provides verified functional specifications, validated DFN-10 package mapping, confirmed thermal regulation behavior, and real-world USB/AC dual-source charging design constraints - all directly traceable to Microchip DS20002071C.
Technical Context
The MCP73838-FJI/UN implements a CC/CV charge algorithm with factory-set 4.20V regulation, programmable AC charge current (15–1000 mA via PROG1), and selectable USB current (100/500 mA via PROG2 logic level). Its autonomous power source selector prioritizes VAC over VUSB and enforces USB specification compliance.
Thermal regulation dynamically reduces charge current above die temperature thresholds (150°C shutdown, 10°C hysteresis), while the TE pin enables/disables the safety timer (4/6/8 hr options). Battery temperature monitoring uses a 50 µA THERM bias current with NTC thermistor interface and dual-voltage comparators (VT1 = 1.23V, VT2 = 0.25V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±0.5% - factory-trimmed reference ensures cell longevity and compliance with standard Li-ion chemistry. |
| AC Charge Current Range | 15–1000 mA - set by 1 kΩ–10 kΩ resistor on PROG1; 1000 mA max enables fast charging of ≥1200 mAh batteries. |
| USB Charge Current Options | 100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - adheres to USB 2.0 unit load definitions. |
| Thermal Shutdown Threshold | 150°C with 10°C hysteresis - protects IC and battery under high ambient or poor PCB thermal design. |
| THERM Bias Current | 50 µA ±6% - drives common 10 kΩ NTC thermistors for accurate battery temperature sensing. |
| UVLO Hysteresis (AC) | 55 mV - prevents oscillation during AC adapter brownout conditions near 4.15V startup threshold. |
| Package Thermal Resistance | θJA = 41°C/W - measured on 4-layer board with exposed pad; enables >800 mA continuous operation without forced airflow. |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Accepts 4.4–6.0V; dominates power selection when present; requires ≥4.7 µF bypass to VSS. |
| VUSB | USB port supply input | Accepts 4.4–6.0V; active only when VAC is absent; requires ≥1 µF bypass to VSS. |
| STAT1 | Open-drain charge status output | Active-low during preconditioning, fast charge, and CV phases; high-Z at charge completion. |
| STAT2 | Open-drain charge status output | Active-low only at charge completion; high-Z otherwise - enables dual-LED status indication. |
| VSS | Ground reference | Common return for battery, inputs, and EP; internal connection to exposed thermal pad. |
| PROG1 | AC charge current programming input | Resistor-to-VSS sets IREG (15–1000 mA); floating disables charge; >70 kΩ forces shutdown. |
| PROG2 | USB charge current select input | Digital input: Low = 100 mA, High = 500 mA; floating disables USB charging. |
| TE | Timer Enable input | Active-low; pulls low to enable safety timer (4/6/8 hr); high disables timer - unique to MCP73838. |
| THERM | Thermistor monitoring input | Biased with 50 µA current; interfaces with NTC thermistor to suspend charge outside -10°C to +55°C. |
| VBAT | Battery positive terminal connection | Delivers regulated charge current; requires ≥1 µF bypass capacitor for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | VAC takes priority over VUSB without host MCU intervention - eliminates software dependency for power path control. |
| Integrated reverse discharge protection | Output leakage <0.55 µA in shutdown - preserves battery charge when system is unpowered. |
| Programmable safety timer | Configurable 4/6/8 hr timeout via TE pin state - prevents overcharge during abnormal CV phase extension. |
| Preconditioning with disable option | Trickle charge at 7.5–50% of IREG below VPTH = 66.5% × VREG - recovers deeply depleted cells safely. |
| Thermal regulation with foldback | Continuous current reduction above 125°C; full shutdown at 150°C - maintains reliability under sustained high-power operation. |
Applications
| Smartphone Charging Circuit | Bluetooth Headset Power Management |
|---|---|
Use Scenario: Dual-input charging circuit for compact smartphone with wall adapter and PC USB fallback. IC Role / Device Role / Timing Role: Autonomous power source selector and CC/CV charger managing 4.2V Li-Po cell with thermal foldback. Use Value: Eliminates need for external power-path MOSFETs and MCU-based charge arbitration; reduces BOM count by 3–5 components. |
Use Scenario: Space-constrained Bluetooth headset requiring safe, low-leakage charging from USB or proprietary dock. IC Role / Device Role / Timing Role: Linear charger with 100 mA USB profile and automatic recharge at 94% VREG threshold. Use Value: Enables <2 µA reverse discharge in standby - extends shelf life and eliminates battery drain during storage. |
| Handheld Medical Monitor | Ultra-Mobile PDA |
Use Scenario: Portable ECG monitor with battery backup and clinical-grade thermal safety requirements. IC Role / Device Role / Timing Role: Temperature-monitored charger using THERM input and 150°C thermal shutdown. Use Value: Meets IEC 60601-1 thermal limits via hardware-enforced cutoff - avoids firmware-level safety certification burden. |
Use Scenario: Thin PDA with dual-input charging and minimal PCB area budget. IC Role / Device Role / Timing Role: Compact DFN-packaged charger supporting 500 mA USB fast charge and 1 A AC charge. Use Value: 3×3 mm footprint saves >25 mm² vs. MSOP-10; exposed pad enables passive cooling without heatsink. |
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 |
|---|---|---|---|
| MCP73837-FJI/UN | Lacks TE pin; includes PG (Power-Good) open-drain output instead of timer enable. | Used where input power presence indication (PG) is required but safety timer is managed externally. | Select when system-level timer control exists and power-good signaling is needed for host MCU sequencing. |
| BQ24075RGTR | TI part with 4.2V regulation, 1.5A max charge, no autonomous AC/USB selection - requires external power-path control. | Suitable for single-source (USB-only) designs; lacks integrated source arbitration logic. | Choose only if AC adapter support is unnecessary and higher current (1.5A) justifies added external FETs and control logic. |
Compared with MCP73837-FJI/UN, MCP73838-FJI/UN trades PG functionality for TE-based timer control - enabling hardware-safeguarded charge termination without MCU involvement. Versus BQ24075RGTR, MCP73838-FJI/UN integrates dual-source arbitration and requires zero external power-path components.
Availability
MCP73838-FJI/UN is available at Aetrix Electronics and suitable for smartphone charging circuits, Bluetooth headset power management, handheld medical monitors, and ultra-mobile PDA designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MCP73838-FJI/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 microcontroller, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP7383x family was designed specifically for space-constrained portable Li-ion/Li-polymer battery charging applications requiring autonomous dual-input power selection, precise voltage regulation, and integrated thermal safety - without MCU supervision.
FAQ
What is the exact charge voltage setting for MCP73838-FJI/UN?
The MCP73838-FJI/UN is factory-configured for 4.20V ±0.5% constant-voltage regulation, as specified in Microchip DS20002071C Section 1.0. This value is laser-trimmed and not user-adjustable; it matches standard single-cell Li-ion battery requirements and ensures optimal cycle life and safety compliance.
Does MCP73838-FJI/UN support both AC adapter and USB charging simultaneously?
No - the MCP73838-FJI/UN implements autonomous source selection: when both VAC and VUSB are present, the AC adapter input takes priority and powers the charge circuit exclusively. The USB port remains inactive until VAC is removed, preventing backfeed or conflict between sources.
How does the TE pin function on MCP73838-FJI/UN?
The TE (Timer Enable) pin on MCP73838-FJI/UN is an active-low digital input that enables or disables the internal safety timer. When pulled low, the timer activates with factory-set durations (4/6/8 hr); when high, the timer is disabled. This feature is exclusive to the MCP73838 variant and replaces the PG pin found on MCP73837-FJI/UN.
What is the maximum AC charge current achievable with MCP73838-FJI/UN?
The MCP73838-FJI/UN supports up to 1000 mA AC charge current when a 1 kΩ resistor is connected between PROG1 and VSS, per DS20002071C Table 1-1. This maximum is guaranteed across –5°C to +55°C ambient and requires adequate PCB thermal design (θJA ≤ 41°C/W) to sustain continuous operation.
Can MCP73838-FJI/UN be used without a thermistor?
Yes - the THERM pin can be left unconnected or tied to VSS to disable temperature monitoring. In this configuration, the MCP73838-FJI/UN operates normally but omits thermal fault detection and suspension. Full safety compliance (e.g., IEC 60601-1) requires thermistor connection and proper NTC biasing.
MCP73838-FJI/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
MCP73838-FJI/UN FAQ
1.How can I place an order for MCP73838-FJI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73838-FJI/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 MCP73838-FJI/UN reliable?
The price and inventory of MCP73838-FJI/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73838-FJI/UN is usually 5 days.
3.What payment methods are accepted for MCP73838-FJI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73838-FJI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73838-FJI/UN?
MCP73838-FJI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73838-FJI/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 MCP73838-FJI/UN?
For technical support, including MCP73838-FJI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73838-FJI/UN requirements.
6.How does Aetrix verify that MCP73838-FJI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73838-FJI/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 MCP73838-FJI/UN meets industry standards.
7.What is the process for return or replacement of MCP73838-FJI/UN?
All MCP73838-FJI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73838-FJI/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 MCP73838-FJI/UN part is unused and in its original packaging.
Return procedure for MCP73838-FJI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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