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Microchip Technology MCP73837-FJI/UN
- Part No.:
- MCP73837-FJI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73837-FJI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:684
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Product details
Overview
MCP73837-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, 100 mA to 1000 mA programmable AC charge current, and thermal regulation. It serves as the primary charging control IC in compact portable devices requiring dual-input power path management.
For engineers reviewing the MCP73837-FJI/UN datasheet, MCP73837-FJI/UN pinout, MCP73837-FJI/UN application, or MCP73837-FJI/UN equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for Li-ion charging systems.
Technical Context
The MCP73837-FJI/UN implements a CC/CV charge algorithm with factory-set 4.20V regulation, selectable preconditioning (10% of IREG), and automatic termination at 5% IREG. Its dual-source arbitration logic prioritizes VAC over VUSB, and internal 50 µA thermistor bias enables NTC-based temperature monitoring.
It integrates pass FETs with 350 mΩ typical RDS(on), reverse discharge protection, UVLO with 3.45V start/3.35V stop thresholds for USB and 4.15V/4.10V for AC, and two open-drain status outputs (STAT1, STAT2) plus PG for power-good indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±0.5% - Ensures precise full-charge termination for standard single-cell Li-ion batteries without overvoltage risk. |
| AC Charge Current Range | 95–115 mA (PROG1 = 10 kΩ) to 900–1100 mA (PROG1 = 1 kΩ) - Enables scalable fast-charge design across battery capacities from 180 mAh to 1200 mAh. |
| USB Charge Current | 90 mA (PROG2 = Low) or 450 mA (PROG2 = High) - Complies with USB 2.0 unit-load (100 mA) and high-power (500 mA) limits. |
| Thermal Regulation Threshold | 150°C die temperature with 10°C hysteresis - Dynamically reduces charge current to prevent thermal runaway during high-ambient or high-power operation. |
| Operating Temperature | -40°C to +85°C ambient - Validated for industrial-grade portable electronics including medical and outdoor consumer devices. |
| Package | 10-Lead 3 mm × 3 mm DFN with exposed thermal pad - Provides 41°C/W θJA for efficient heat dissipation in space-constrained PCB layouts. |
| UVLO Hysteresis | 75 mV (USB), 55 mV (AC) - Prevents oscillation during marginal input voltage conditions near threshold. |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter supply input | Primary high-current input (up to 1 A); dominates over VUSB when both present; requires ≥4.7 µF bypass capacitor. |
| VUSB | USB port supply input | Fallback low-current input (≤500 mA); activates only when VAC is absent; requires ≥1 µF bypass. |
| STAT1 | Open-drain charge status output | Active-low during preconditioning, fast charge, and constant-voltage phases; high-Z at charge completion. |
| STAT2 | Open-drain charge status output | Active-low only at charge completion; high-Z otherwise - provides complementary status signaling. |
| VSS | Battery and supply ground reference | Common return for battery negative, input supplies, and exposed thermal pad (EP). |
| PROG1 | AC charge current set & enable | Resistor-to-VSS sets IREG; >70 kΩ disables device; floating enters standby mode. |
| PROG2 | USB charge current select | Digital input: Low = 100 mA, High = 500 mA; also sets precondition/termination ratios for USB mode. |
| PG | Power-good status output | Open-drain indicator active when valid input power (VAC or VUSB) is present and within UVLO window. |
| THERM | NTC thermistor interface | 50 µA bias current source; monitors battery temperature via voltage divider; triggers thermal fault if out-of-range. |
| VBAT | Battery positive connection | Charging output and battery sensing node; requires ≥1 µF bypass for stability when battery disconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | VAC takes priority over VUSB without host MCU intervention - eliminates software dependency for power-path arbitration. |
| Integrated reverse discharge protection | Output leakage < 0.55 µA in shutdown - prevents battery drain when input power is removed. |
| Programmable safety timer | Configurable 4/6/8-hour timeout - prevents indefinite charging under fault conditions like failed termination. |
| LDO system test mode | Activated when THERM > VDD – 100 mV - allows verification of battery path continuity and regulator functionality without battery. |
| Preconditioning disable option | Factory-configured ratio (10% IREG) - safely recovers deeply depleted cells before fast charge, reducing stress on aged batteries. |
Applications
| Smartphone Charging System | Portable Medical Monitor |
|---|---|
Use Scenario: Dual-input (USB + wall adapter) charging in space-constrained smartphone PCBs with thermal-aware battery management. IC Role / Device Role / Timing Role: Primary linear charger IC managing CC/CV profile, source arbitration, and thermal foldback. Use Value: Enables 4.20V ±0.5% accurate termination and 1000 mA fast charge while maintaining <150°C junction temperature under worst-case ambient. | Use Scenario: Rechargeable Li-ion battery in handheld ECG or pulse oximeter requiring reliable, low-leakage charging and battery temperature monitoring. IC Role / Device Role / Timing Role: Standalone charge controller with NTC-based thermal supervision and automatic recharge at 94% VREG. Use Value: Delivers <0.55 µA reverse discharge current in shutdown and 50 µA thermistor bias for accurate -40°C to +85°C temperature tracking. |
| Bluetooth Headset | Digital Camera |
Use Scenario: Ultra-compact charging solution for sub-500 mAh Li-Po batteries in Bluetooth earbuds with USB-C input. IC Role / Device Role / Timing Role: Integrated charger with PROG2-controlled 100/500 mA USB current and automatic end-of-charge detection. Use Value: Supports USB 2.0 compliance and achieves full charge in <90 minutes using 450 mA USB-High mode with 5% ITERM termination. | Use Scenario: Dual-source charging for DSLR or mirrorless camera battery packs where AC adapter is used for rapid field charging and USB for trickle top-up. IC Role / Device Role / Timing Role: Autonomous charge manager selecting VAC when available, falling back to VUSB, with PG output confirming input validity. Use Value: Eliminates need for external power-path switches or MCU polling; PG signal directly drives input-status LED with no additional components. |
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 |
|---|---|---|---|
| MCP73831T-2DCI/OT | SOT-23-6 package; fixed 4.2V regulation; no PG output; USB-only input (no VAC pin); max 500 mA charge current. | Single-input (USB only) designs with minimal board area; no AC adapter support required. | Select when space is critical and dual-source capability is unnecessary - saves 4 pins and simplifies layout but sacrifices AC fast-charge flexibility. |
| BQ24075RGTR | 16-pin QFN; supports 4.2V/4.35V selection; integrated LDO; higher 1.5A max charge current; I2C programmability. | Systems requiring dynamic voltage selection, higher current, or host-controlled configuration via I2C bus. | Choose when firmware configurability, higher current headroom, or multiple battery voltage options are needed - adds complexity but increases system flexibility. |
Compared with MCP73831T-2DCI/OT, MCP73837-FJI/UN adds autonomous VAC/VUSB arbitration and PG status, enabling robust dual-input systems; versus BQ24075RGTR, it offers simpler analog control and lower component count but lacks I²C interface and voltage flexibility.
Availability
MCP73837-FJI/UN is available at Aetrix Electronics and suitable for smartphone charging systems, portable medical monitors, Bluetooth headsets, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP73837-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 is a leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP73837-FJI/UN belongs to Microchip's dedicated linear battery charger product line, engineered for space-constrained portable electronics requiring autonomous dual-input charging, precision voltage regulation, and integrated thermal safety.
FAQ
What is the exact charge voltage setting for the MCP73837-FJI/UN?
The MCP73837-FJI/UN is factory-configured for a fixed 4.20V constant-voltage regulation with ±0.5% tolerance across -5°C to +55°C. This value is confirmed in Section 1.0 Electrical Characteristics of DS20002071C, Table "Voltage Regulation", and applies specifically to the MCP73837-FJI/UN variant - not the broader MCP73837/8 family.
Does the MCP73837-FJI/UN support both AC adapter and USB inputs simultaneously?
Yes, the MCP73837-FJI/UN supports simultaneous VAC and VUSB inputs and autonomously selects VAC as the primary source. When both are present, VAC dominates and sets the charge current via PROG1; VUSB remains inactive but ready as fallback. This behavior is defined in the Functional Block Diagram and Section 4.2 "Autonomous Power Source Selection" of DS20002071C.
What is the function of the PG pin on the MCP73837-FJI/UN?
The PG (Power-Good) pin on the MCP73837-FJI/UN is an open-drain output that asserts low when a valid input supply (VAC or VUSB) is present and above UVLO thresholds. It is exclusive to the MCP73837 series (not MCP73838) and provides hardware-level confirmation of input readiness - a feature confirmed in Table 3-1 Pin Function Table and Section 3.8 of DS20002071C.
How does thermal regulation operate in the MCP73837-FJI/UN?
Thermal regulation in the MCP73837-FJI/UN activates when die temperature reaches 150°C (±0°C typical), reducing charge current to maintain safe operating temperature. The thermal shutdown hysteresis is 10°C, so regulation resumes at 140°C. This is implemented via internal thermal sensing and is documented in Section "Thermal Shutdown" of DS20002071C, page 6.
Can the MCP73837-FJI/UN be used without a thermistor?
Yes, the MCP73837-FJI/UN operates without a thermistor. The THERM pin defaults to normal charging if left unconnected or pulled to VSS; thermistor monitoring is optional. However, omitting the thermistor disables temperature-based fault protection. This behavior is specified in Section 3.10 and Figure 4-1 Operational Algorithm of DS20002071C.
MCP73837-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
MCP73837-FJI/UN FAQ
1.How can I place an order for MCP73837-FJI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73837-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 MCP73837-FJI/UN reliable?
The price and inventory of MCP73837-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 MCP73837-FJI/UN is usually 5 days.
3.What payment methods are accepted for MCP73837-FJI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837-FJI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73837-FJI/UN?
MCP73837-FJI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73837-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 MCP73837-FJI/UN?
For technical support, including MCP73837-FJI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837-FJI/UN requirements.
6.How does Aetrix verify that MCP73837-FJI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73837-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 MCP73837-FJI/UN meets industry standards.
7.What is the process for return or replacement of MCP73837-FJI/UN?
All MCP73837-FJI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837-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 MCP73837-FJI/UN part is unused and in its original packaging.
Return procedure for MCP73837-FJI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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