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Microchip Technology MCP73838-NVI/UN
- Part No.:
- MCP73838-NVI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73838-NVI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,169
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Product details
Overview
MCP73838-NVI/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, 1000 mA maximum AC charge current, and Timer Enable (TE) pin for safety timer control - used in ultra-mobile devices requiring dual-source charging with thermal regulation and battery temperature monitoring.
For engineers reviewing the MCP73838-NVI/UN datasheet, MCP73838-NVI/UN pinout, MCP73838-NVI/UN application, or MCP73838-NVI/UN equivalent, key selection criteria include its 10-lead 3 mm × 3 mm DFN package, TE pin functionality (distinguishing it from MCP73837), programmable AC charge current via PROG1, USB current selection via PROG2 logic level, and integrated reverse discharge protection with thermal regulation.
Technical Context
The MCP73838-NVI/UN implements a CC/CV charge algorithm with factory-set 4.20V regulation, preconditioning for deeply depleted cells, and automatic recharge at 94% VREG threshold. Its dual-input architecture autonomously selects VAC over VUSB when both are present, enforcing USB specification compliance (100 mA / 500 mA) and enabling up to 1 A AC charging via external PROG1 resistor.
Thermal regulation dynamically reduces charge current above die temperature thresholds (150°C shutdown, 10°C hysteresis), while the THERM pin supports NTC thermistor biasing at 50 µA for battery temperature monitoring. The TE pin (pin 8) enables/disables the safety timer (4/6/8 hr options), distinguishing MCP73838 from MCP73837's PG pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±0.5% - precise regulation for standard single-cell Li-ion batteries |
| Max AC Charge Current | 1000 mA - set by 1 kΩ PROG1 resistor, supports fast charging from wall adapters |
| USB Charge Current | 100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - compliant with USB 2.0 unit load definitions |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and portable consumer environments |
| Package | 10-Lead 3 mm × 3 mm DFN with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation (θJA = 41°C/W) |
| Safety Timer Control | TE pin (active-low) - enables/disables configurable 4/6/8-hour safety timer without external components |
| Battery Temp Monitoring | THERM pin with 50 µA bias current - interfaces directly with standard 10 kΩ NTC thermistors |
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 (θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC (Pin 1) | AC adapter supply input | Accepts 4.3–6 V; dominates power source selection when present; requires ≥4.7 µF bypass capacitor |
| VUSB (Pin 2) | USB port supply input | Accepts 3.7–6 V; provides backup charging when VAC absent; requires ≥1 µF bypass |
| STAT1 (Pin 3) | Open-drain status output | Indicates active charging (LOW) or charge complete (high-Z); drives LED or microcontroller |
| STAT2 (Pin 4) | Open-drain status output | Indicates charge complete (LOW) or inactive (high-Z); complements STAT1 for multi-state indication |
| VSS (Pin 5) | Ground reference | Common return for battery, inputs, and EP; must connect to PCB ground plane |
| PROG1 (Pin 6) | AC charge current programming | Resistor-to-VSS sets ICHG (15–1000 mA); also acts as charge enable/shutdown control |
| PROG2 (Pin 7) | USB charge current selection | Digital input: LOW = 100 mA, HIGH = 500 mA; sets precondition/termination ratios |
| TE (Pin 8) | Timer Enable | Active-low input controlling safety timer (4/6/8 hr); distinguishes MCP73838 from MCP73837's PG pin |
| THERM (Pin 9) | Thermistor interface | 50 µA bias current source for NTC; monitors battery temperature during charge cycle |
| VBAT (Pin 10) | Battery positive terminal | Connects to Li-ion anode; 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 intervention - eliminates need for external power-path controllers |
| Integrated pass transistor | 350 mΩ RDS(on) at 105°C - enables full 1 A charging with minimal dropout and thermal overhead |
| Reverse discharge protection | Output leakage < 0.55 µA in shutdown - prevents battery drain when input power removed |
| Programmable preconditioning | Factory-set 66.5% VREG threshold with 120 mV hysteresis - safely recovers deeply discharged cells |
| Thermal regulation | Dynamic current reduction before 150°C shutdown - maintains charge progress under high ambient or power conditions |
Applications
| Smartphones | Portable Medical Devices |
|---|---|
Use Scenario: Compact handheld device with single-cell Li-ion battery and dual-input charging (USB + wall adapter). IC Role / Device Role / Timing Role: Primary linear charge controller managing CC/CV profile, source arbitration, and thermal safety. Use Value: Enables space-constrained designs with no external MOSFETs or sense resistors while meeting USB compliance and JEDEC battery safety requirements. | Use Scenario: Battery-powered glucose meter or pulse oximeter requiring reliable, low-risk charging in clinical environments. IC Role / Device Role / Timing Role: Safety-critical charge manager with NTC-based temperature monitoring and configurable safety timer. Use Value: Prevents thermal runaway during charging via real-time die and battery temperature feedback, supporting ISO 13485 design validation. |
| Bluetooth Headsets | Digital Cameras |
Use Scenario: Ultra-low-power wearable audio device with tight board area and strict leakage limits. IC Role / Device Role / Timing Role: Standby-optimized charger with sub-5 µA shutdown current and automatic power-down when input removed. Use Value: Extends shelf life and reduces parasitic drain - critical for devices shipped with partial battery charge. | Use Scenario: Intermittent-use imaging device with rapid recharge requirement between photo sessions. IC Role / Device Role / Timing Role: High-current (1 A) linear charger with fast CV transition and automatic recharge at 94% VREG. Use Value: Reduces recharge time from 20% to 80% state-of-charge by >35% compared to fixed 500 mA solutions. |
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 |
|---|---|---|---|
| MCP73837T-2ACI/OT | Replaces TE pin with PG (Power-Good) output; identical CC/CV, PROG1/PROG2, and thermal regulation | Used where system-level power-good signaling to host MCU is required instead of safety timer control | Select when host firmware requires input power presence detection rather than charge timeout enforcement |
| BQ24075RGTR | TI part with 4.2V regulation, 1.5A max charge, but lacks autonomous VAC/VUSB arbitration and integrated TE/PG logic | Requires external power-path FET and GPIO-controlled source selection; broader VIN range (4.35–6.5V) | Select when higher charge current or extended input voltage range is prioritized over integrated dual-source autonomy |
Compared with MCP73838-NVI/UN, MCP73837T-2ACI/OT trades TE functionality for PG signaling - ideal for systems needing input status feedback - while BQ24075RGTR offers higher current headroom but demands external power-path control and additional GPIO coordination.
Availability
MCP73838-NVI/UN is available at Aetrix Electronics and suitable for smartphones, portable medical devices, Bluetooth headsets, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP73838-NVI/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, communications, and consumer markets with high-reliability silicon and development tools.
The MCP7383x family is designed specifically for space-constrained portable Li-ion/Li-polymer battery charging applications, emphasizing integration, USB/AC dual-source autonomy, and robust thermal and safety management without external discrete components.
FAQ
What is the fixed charge voltage of the MCP73838-NVI/UN?
The MCP73838-NVI/UN has a factory-set constant-voltage regulation point of 4.20 V with ±0.5% tolerance across -5°C to +55°C. This value is not user-adjustable and is optimized for standard single-cell Li-ion batteries. The MCP73838-NVI/UN datasheet confirms this specification in Section 1.0 Electrical Characteristics under "Regulated Charge Voltage" with typical values of 4.179 V (min) and 4.221 V (max).
How does the TE pin on the MCP73838-NVI/UN function?
The TE (Timer Enable) pin on the MCP73838-NVI/UN is an active-low digital input that enables or disables the internal safety timer. When pulled low, the timer activates with factory-configured durations (4/6/8 hours); when high, the timer is disabled. This pin distinguishes MCP73838-NVI/UN from MCP73837 variants and is documented in Section 3.9 of the MCP73838-NVI/UN datasheet.
What is the maximum AC adapter charge current supported by the MCP73838-NVI/UN?
The MCP73838-NVI/UN supports up to 1000 mA AC adapter charge current, achieved by connecting a 1 kΩ resistor from PROG1 to VSS. This value is production-guaranteed per the datasheet's "AC Adapter Fast Charge Current" table (IREG = 900–1100 mA at TA = -5°C to +55°C). Lower currents are set using higher PROG1 resistance values down to 15 mA.
Does the MCP73838-NVI/UN include battery temperature monitoring?
Yes, the MCP73838-NVI/UN includes dedicated battery temperature monitoring via the THERM pin, which sources a precise 50 µA (47–53 µA) bias current for interfacing with standard 10 kΩ NTC thermistors. The device compares thermistor voltage against upper (1.23 V) and lower (0.25 V) thresholds to detect out-of-range temperatures and suspend charging, as specified in Section 1.0 Electrical Characteristics.
What package type is used for the MCP73838-NVI/UN?
The MCP73838-NVI/UN is supplied in a 10-Lead 3 mm × 3 mm DFN package with an exposed thermal pad (EP), internally connected to VSS. This package delivers θJA = 41°C/W on a 4-layer PCB and requires soldering the EP to a PCB ground plane for thermal integrity and electrical safety, as detailed in Section 3.12 and Table 3-1 of the MCP73838-NVI/UN datasheet.
MCP73838-NVI/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:
- 4.35V
- 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-NVI/UN FAQ
1.How can I place an order for MCP73838-NVI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73838-NVI/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-NVI/UN reliable?
The price and inventory of MCP73838-NVI/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-NVI/UN is usually 5 days.
3.What payment methods are accepted for MCP73838-NVI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73838-NVI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73838-NVI/UN?
MCP73838-NVI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73838-NVI/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-NVI/UN?
For technical support, including MCP73838-NVI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73838-NVI/UN requirements.
6.How does Aetrix verify that MCP73838-NVI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73838-NVI/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-NVI/UN meets industry standards.
7.What is the process for return or replacement of MCP73838-NVI/UN?
All MCP73838-NVI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73838-NVI/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-NVI/UN part is unused and in its original packaging.
Return procedure for MCP73838-NVI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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