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Microchip Technology MCP73838-FJI/MF
- Part No.:
- MCP73838-FJI/MF
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP73838-FJI/MF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP73838-FJI/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, ±0.5% voltage regulation accuracy, 4.20V fixed charge voltage, thermal regulation, and timer enable (TE) functionality. It delivers up to 1000 mA AC charge current and supports 100/500 mA USB charge current selection in portable medical devices and ultra-mobile electronics.
For engineers reviewing the MCP73838-FJI/MF datasheet, MCP73838-FJI/MF pinout, MCP73838-FJI/MF application, or MCP73838-FJI/MF equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts, and supply-chain support for production-grade BOMs.
Technical Context
The MCP73838-FJI/MF implements a CC/CV charging 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 TE pin enables/disables the safety timer (4/6/8 hr options), distinguishing it from the MCP73837 which uses PG instead.
It integrates pass transistors (350 mΩ typical RDS(on)), reverse discharge protection, battery temperature monitoring via 50 µA THERM bias, and automatic power-down when input drops within 100 mV of VBAT. UVLO thresholds differ for AC (4.1–4.3 V start) and USB (3.35–3.55 V start) inputs, with built-in hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±0.5% - factory-trimmed for single-cell Li-ion compliance; eliminates external voltage-setting components. |
| AC Charge Current Range | 15–1000 mA - set by 1–10 kΩ resistor on PROG1; supports wide battery capacity scaling without redesign. |
| USB Charge Current Options | 100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - adheres to USB 2.0 unit load definitions for host-compliant operation. |
| Thermal Regulation | Active die-temperature-based current limiting - maintains safe operation up to 150°C junction temp; prevents thermal runaway during high-power charging. |
| Safety Timer Enable | Dedicated TE pin (active-low) - enables configurable 4/6/8 hr timeout; critical for fail-safe termination in unattended charging applications. |
| Operating Temperature | −40°C to +85°C ambient - validated across industrial and portable medical environments with full parameter guarantees. |
| Package | 10-lead 3 mm × 3 mm DFN with exposed thermal pad - achieves θJA = 41°C/W for compact, thermally robust PCB layouts. |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS. Requires EP soldering to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Accepts 4.3–6 V; dominates over USB when both present; requires ≥4.7 µF bypass capacitor. |
| VUSB | USB port supply input | Accepts 3.45–6 V; used only when VAC is absent; requires ≥1 µF bypass capacitor. |
| STAT1 | Open-drain charge status output | Active-low during precondition, fast charge, and CV phases; high-Z at charge completion for LED or MCU interface. |
| STAT2 | Open-drain charge status output | Active-low only at charge completion; complements STAT1 for dual-indicator or host notification systems. |
| VSS | Ground reference | Common return for battery, inputs, and internal circuitry; must connect to EP for thermal integrity. |
| PROG1 | AC charge current programming input | Resistor-to-VSS sets IREG; also acts as shutdown enable - >70 kΩ disables device. |
| PROG2 | USB charge current select input | Digital input: Low = 100 mA, High = 500 mA; determines precondition/termination ratios for USB mode. |
| TE | Timer Enable input | Active-low control for safety timer; pulled high disables timer, pulled low enables selected timeout period. |
| THERM | Thermistor monitoring input | 50 µA bias current source for NTC thermistors; enables battery temperature qualification before/during charge. |
| VBAT | Battery positive connection | Direct connection to Li-ion cell anode; includes integrated reverse discharge protection and loop stability support (≥1 µF). |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | Hardware-based priority logic selects AC over USB without MCU intervention - reduces firmware complexity and boot-time dependencies. |
| Integrated pass transistor & current sense | Eliminates external MOSFET and sense resistor - cuts BOM count by ≥3 components and saves >3 mm² PCB area. |
| Factory-trimmed 4.20V regulation | ±0.5% tolerance over −40°C to +85°C - ensures cell longevity and avoids overvoltage stress without calibration. |
| Programmable safety timer with TE pin | Configurable 4/6/8 hr timeout enabled via dedicated TE pin - provides hardware-enforced charge duration limits for safety-critical designs. |
| Thermal regulation with 150°C shutdown | Dynamic current reduction above threshold - sustains charging under high ambient or poor airflow without system-level thermal management. |
| Reverse discharge protection | <2 µA leakage in shutdown - prevents battery drain when input power is removed, extending shelf life in always-connected devices. |
Applications
| Portable Medical Devices | Ultra-Mobile PCs |
|---|---|
|
Use Scenario: Rechargeable handheld glucose meters and pulse oximeters requiring reliable, low-risk charging in field-deployed units. IC Role / Device Role / Timing Role: Autonomous charge controller managing AC/USB input selection, CC/CV profile, and thermal safety for single-cell Li-ion packs. Use Value: TE-enabled safety timer prevents overcharge during unattended overnight charging; ±0.5% voltage accuracy extends battery cycle life beyond 500 cycles. |
Use Scenario: Fanless tablets and 2-in-1 detachables where space, thermal headroom, and USB-C compatibility are critical. IC Role / Device Role / Timing Role: Dual-input linear charger with integrated pass FET and LDO-mode fallback for system power during battery removal. Use Value: 3×3 mm DFN package and <4.7 µF total capacitance reduce solution footprint by 40% vs discrete alternatives; PROG2 logic-select simplifies USB-C PD negotiation. |
| Bluetooth Headsets | Digital Cameras |
|
Use Scenario: Compact wireless earbuds with rapid USB recharging and battery temperature monitoring during travel. IC Role / Device Role / Timing Role: Charge manager enforcing preconditioning for deeply depleted cells and thermistor-based cold/heat charge inhibition. Use Value: 50 µA THERM bias supports standard 10 kΩ NTCs; 100 mA USB-Low mode enables charging from legacy PC ports without violating current limits. |
Use Scenario: DSLR and mirrorless camera grips with hot-swap Li-ion batteries and dual-input field charging capability. IC Role / Device Role / Timing Role: High-current (1 A) linear charger with automatic recharge and reverse discharge blocking to preserve battery health between shoots. Use Value: 1000 mA AC charge current reduces full recharge time to <2.5 hours for 2200 mAh packs; VBAT-integrated protection avoids external diode losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73837-FJI/MF | Lacks TE pin; includes PG (Power-Good) open-drain output instead; same pinout and regulation options. | Used where input power presence indication (PG) is required over timer control; no hardware-enforced timeout. | Select when system firmware handles charge timing or when AC/USB source monitoring is prioritized over safety timer enforcement. |
| BQ24075RGTR | TI part with 4.2V regulation, 1.5A max charge current, and integrated USB current limit; no TE pin but offers I2C configuration. | Requires MCU for configuration; supports dynamic current adjustment and battery NTC monitoring via register access. | Select when programmability and telemetry (e.g., charge status registers) outweigh need for autonomous hardware timer control. |
Compared with MCP73837-FJI/MF and BQ24075RGTR, the MCP73838-FJI/MF uniquely provides a dedicated TE pin for hardware-enforced safety timer activation-critical for Class II medical or consumer devices lacking runtime supervision-while maintaining identical 4.20V accuracy and 10-lead DFN footprint.
Availability
MCP73838-FJI/MF is available at Aetrix Electronics and suitable for portable medical devices, ultra-mobile PCs, Bluetooth headsets, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MCP73838-FJI/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, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and long-term product availability.
The MCP7383x family is designed specifically for space-constrained, dual-input Li-ion charging applications where autonomous operation, thermal safety, and minimal external components are mandatory - targeting portable healthcare, wearables, and mobile imaging.
FAQ
What is the exact charge voltage setting for MCP73838-FJI/MF?
The MCP73838-FJI/MF is factory-configured for 4.20 V ±0.5% constant-voltage regulation, optimized for standard single-cell Li-ion batteries. This value is laser-trimmed and does not require external resistive feedback. The MCP73838-FJI/MF datasheet confirms this specification applies across −40°C to +85°C ambient temperature with full production testing.
How does the TE pin function on MCP73838-FJI/MF?
The TE (Timer Enable) pin on MCP73838-FJI/MF is an active-low input that enables the internal safety timer when pulled to ground; leaving it high disables the timer. Unlike the MCP73837-FJI/MF, which lacks TE and uses PG instead, the MCP73838-FJI/MF relies on TE for hardware-enforced timeout (4/6/8 hr options), making it suitable for safety-critical unattended charging.
Can MCP73838-FJI/MF support both AC and USB charging simultaneously?
No - the MCP73838-FJI/MF implements autonomous source selection with AC adapter priority: when both VAC and VUSB are present, the device uses VAC exclusively and ignores VUSB. The USB path activates only when VAC is absent or below UVLO threshold (≤4.0 V), ensuring predictable power-path behavior without contention or backfeed.
What is the maximum AC charge current supported by MCP73838-FJI/MF?
The MCP73838-FJI/MF supports up to 1000 mA AC charge current, set by a 1 kΩ resistor from PROG1 to VSS. This value is guaranteed over −5°C to +55°C per DS20002071C-page 4. At higher temperatures, thermal regulation reduces current to maintain safe junction temperature, preserving reliability without external intervention.
Does MCP73838-FJI/MF include reverse battery discharge protection?
Yes - the MCP73838-FJI/MF integrates reverse discharge protection that limits leakage to ≤2 µA when input power is removed and the device enters shutdown mode. This feature prevents battery drain during storage or transport, directly supporting long shelf-life requirements in portable medical and consumer electronics using the MCP73838-FJI/MF.
MCP73838-FJI/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)
MCP73838-FJI/MF FAQ
1.How can I place an order for MCP73838-FJI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73838-FJI/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 MCP73838-FJI/MF reliable?
The price and inventory of MCP73838-FJI/MF 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/MF is usually 5 days.
3.What payment methods are accepted for MCP73838-FJI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73838-FJI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73838-FJI/MF?
MCP73838-FJI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73838-FJI/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 MCP73838-FJI/MF?
For technical support, including MCP73838-FJI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73838-FJI/MF requirements.
6.How does Aetrix verify that MCP73838-FJI/MF is sourced from the original manufacturer or authorized distributors?
All MCP73838-FJI/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 MCP73838-FJI/MF meets industry standards.
7.What is the process for return or replacement of MCP73838-FJI/MF?
All MCP73838-FJI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP73838-FJI/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 MCP73838-FJI/MF part is unused and in its original packaging.
Return procedure for MCP73838-FJI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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