My Inquiry
My Account
Microchip Technology MCP73838T-FJI/UN
- Part No.:
- MCP73838T-FJI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73838T-FJI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP73838T-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) functionality. 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 MCP73838T-FJI/UN datasheet, MCP73838T-FJI/UN pinout, MCP73838T-FJI/UN application, or MCP73838T-FJI/UN equivalent, key selection criteria include its 10-lead 3 mm × 3 mm DFN package, TE pin for safety timer control, dual-source power path management, and factory-set 4.20V regulation - critical for single-cell Li-ion systems requiring USB/AC dual-input compliance and thermal-safe charging.
Technical Context
The MCP73838T-FJI/UN implements a CC/CV charge algorithm with selectable preconditioning and termination, using internal sense FETs (G = 0.001) and dual PROG inputs to set AC (PROG1) and USB (PROG2) current levels independently. Its autonomous source selection prioritizes VAC over VUSB when both are present.
It integrates a 50 µA thermistor bias current source, dual open-drain status outputs (STAT1/STAT2), and a dedicated Timer Enable (TE) input that disables the safety timer when high. The device enters shutdown if PROG1 impedance exceeds 70 kΩ or VDD falls below VBAT − 100 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±0.5% - factory-trimmed for single-cell Li-ion nominal voltage compliance |
| AC Charge Current | 15–1000 mA programmable via PROG1 resistor - enables flexible system-level current scaling |
| USB Charge Current | 100 mA (low) or 500 mA (high) selected by PROG2 logic level - meets USB 2.0 unit load definitions |
| Thermal Regulation | Active die-temperature-based current foldback - maintains reliability at TJ ≥ 150°C with 10°C hysteresis |
| Safety Timer | Configurable 4/6/8 hr duration enabled by TE pin low - prevents indefinite charging under fault conditions |
| Operating Temp | −40°C to +85°C ambient - qualified for industrial and portable medical environments |
| Package | 10-lead 3 mm × 3 mm DFN with exposed thermal pad - provides θJA = 41°C/W for compact thermal design |
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 input (4.1–6.0 V); dominates over VUSB when both present |
| VUSB | USB port supply input | Secondary power source (3.35–6.0 V); supplies charge current only when VAC absent |
| STAT1 | Open-drain status output | Indicates active charging (low) or charge complete (high-Z); drives LED or MCU GPIO |
| STAT2 | Open-drain status output | Indicates charge complete (low) or inactive (high-Z); complements STAT1 for dual-state indication |
| VSS | Ground reference | Common return for battery, inputs, and EP; must connect to PCB ground plane |
| PROG1 | AC current programming input | Resistor-to-VSS sets AC fast charge current (IREG); also enables/disables device |
| PROG2 | USB current select input | Digital input: low = 100 mA, high = 500 mA USB charge current |
| TE | Timer Enable input | Active-low control for built-in safety timer - high disables timer, low enables 4/6/8 hr options |
| THERM | Thermistor monitoring input | 50 µA bias current source for NTC thermistor; enables temperature-based charge suspend |
| VBAT | Battery positive terminal | Connects directly to Li-ion cell anode; requires ≥1 µF bypass capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | VAC automatically overrides VUSB without external logic - reduces BOM and layout complexity |
| Integrated reverse discharge protection | Output leakage < 0.55 µA in shutdown - preserves battery life during system off-state |
| Programmable preconditioning threshold | Factory-set VPTH/VREG ratio (66.5%) - safely recovers deeply depleted cells before CC mode |
| Thermal regulation with foldback | Reduces ICHARGE above TJ = 150°C - avoids thermal runaway while maintaining charge progress |
| LDO-mode system test capability | Enables regulated VBAT output when THERM > VDD − 100 mV - supports bench validation without battery |
Applications
| Smartphone Battery Charging | Portable Medical Monitor |
|---|---|
Use Scenario: Dual-input charging circuit for compact smartphones supporting both wall adapter and PC USB host connections. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, source arbitration, and thermal safety for single-cell Li-ion. Use Value: Eliminates need for external MOSFETs or microcontroller supervision; 4.20V ±0.5% regulation ensures battery longevity per JEITA standards. | Use Scenario: Rechargeable battery system in handheld ECG or pulse oximeter with strict safety and low-power requirements. IC Role / Device Role / Timing Role: Autonomous charge manager with TE-controlled safety timer and thermistor monitoring for patient-critical operation. Use Value: Prevents overcharge and thermal hazard via hardware-enforced 8-hour timer and NTC-based temperature cutoff. |
| Bluetooth Headset Charger | Ultra-Mobile PDA |
Use Scenario: Space-constrained charging subsystem in Bluetooth earbuds case with USB-C input and small Li-Po cell. IC Role / Device Role / Timing Role: Compact DFN-packaged charger delivering 100 mA USB-Low mode with automatic recharge at 94% VREG. Use Value: 3 mm × 3 mm footprint and <5 µA standby current extend shelf life and reduce PCB area vs. discrete solutions. | Use Scenario: Power management in fanless PDA with AC adapter backup and USB sync/charge capability. IC Role / Device Role / Timing Role: Dual-path linear charger with PG-equivalent status signaling (via STAT1/STAT2) and LDO test mode for firmware validation. Use Value: System test mode allows functional verification without battery installed - accelerates production test and debug cycles. |
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 |
|---|---|---|---|
| MCP73837T-FJI/UN | Includes PG (Power-Good) output instead of TE; identical pinout and regulation but lacks timer enable control | Preferred where input power presence indication is required over safety timer configuration | Select MCP73837T-FJI/UN when host system needs VAC/VUSB presence flag rather than programmable charge timeout |
| BQ24075RGTR | TI part with 4.2V regulation, 1.5A max charge current, and no TE pin; uses different PROG scheme and lacks autonomous source selection logic | Requires external diode-OR or controller for dual-source handling; suited for higher-current, non-autonomous designs | Choose BQ24075RGTR only if >1A charge current or TI ecosystem alignment outweighs loss of autonomous VAC/VUSB arbitration |
Compared with MCP73837T-FJI/UN, the MCP73838T-FJI/UN trades PG output for TE control-enabling precise safety timer activation-while retaining identical regulation accuracy, thermal foldback, and DFN packaging. Against BQ24075RGTR, it offers true hardware-based source selection without external components, reducing system-level complexity for USB/AC dual-input portable devices.
Availability
MCP73838T-FJI/UN is available at Aetrix Electronics and suitable for smartphone battery charging, portable medical monitors, Bluetooth headset chargers, and ultra-mobile PDA applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability margins.
Supply support for MCP73838T-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 microcontrollers, analog devices, and interface ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The MCP7383x family is designed specifically for autonomous, single-cell Li-ion/Li-polymer charging in space- and cost-constrained portable electronics - emphasizing integration, safety, and USB/AC dual-source compliance without firmware dependency.
FAQ
What is the factory-set charge voltage for MCP73838T-FJI/UN?
The MCP73838T-FJI/UN has a factory-trimmed constant-voltage regulation set to 4.20 V with ±0.5% accuracy across −40°C to +85°C. This value is fixed and not user-adjustable; other variants in the MCP73837/8 family offer 4.35V, 4.40V, or 4.50V options, but MCP73838T-FJI/UN specifically implements the 4.20V variant per Microchip's product identification system.
How does the TE pin on MCP73838T-FJI/UN control the safety timer?
The TE (Timer Enable) pin on MCP73838T-FJI/UN is an active-low input: pulling TE low enables the internal safety timer (configurable for 4/6/8 hours), while holding TE high disables the timer entirely. This allows system designers to retain full hardware control over charge timeout behavior without relying on firmware - a key distinction from the MCP73837T-FJI/UN, which lacks TE and instead provides a PG output.
Can MCP73838T-FJI/UN operate with only a USB power source?
Yes, MCP73838T-FJI/UN operates autonomously with only VUSB applied. When VAC is absent, the device draws power from VUSB and delivers charge current based on the PROG2 logic level (100 mA for low, 500 mA for high). UVLO thresholds differ between sources (3.45 V start for USB vs. 4.15 V for AC), ensuring robust startup even with marginal USB bus voltage.
What is the function of the THERM pin on MCP73838T-FJI/UN?
The THERM pin on MCP73838T-FJI/UN provides a 50 µA (typical) bias current for an external NTC thermistor, enabling real-time battery temperature monitoring. Internal comparators trigger charge suspension if temperature exceeds upper (1.23 V) or falls below lower (0.25 V) thresholds - a hardware-safeguarded feature critical for medical and consumer safety certification.
Does MCP73838T-FJI/UN require external MOSFETs for charging?
No, MCP73838T-FJI/UN integrates all necessary pass transistors, current sensing, and reverse discharge protection circuitry. It drives the battery directly from VBAT using internal sense FETs (G = 0.001), eliminating external MOSFETs, current-sense resistors, and OR-ing diodes - reducing total solution size and bill-of-materials cost compared to discrete charger implementations.
MCP73838T-FJI/UN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MCP73838T-FJI/UN FAQ
1.How can I place an order for MCP73838T-FJI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73838T-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 MCP73838T-FJI/UN reliable?
The price and inventory of MCP73838T-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 MCP73838T-FJI/UN is usually 5 days.
3.What payment methods are accepted for MCP73838T-FJI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73838T-FJI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73838T-FJI/UN?
MCP73838T-FJI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73838T-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 MCP73838T-FJI/UN?
For technical support, including MCP73838T-FJI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73838T-FJI/UN requirements.
6.How does Aetrix verify that MCP73838T-FJI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73838T-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 MCP73838T-FJI/UN meets industry standards.
7.What is the process for return or replacement of MCP73838T-FJI/UN?
All MCP73838T-FJI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73838T-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 MCP73838T-FJI/UN part is unused and in its original packaging.
Return procedure for MCP73838T-FJI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP73838T-FJI/UN Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
