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Microchip Technology MCP73837T-NVI/UN
- Part No.:
- MCP73837T-NVI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73837T-NVI/UN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
MCP73837T-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, thermal regulation, and dual open-drain status outputs - designed for space-constrained portable devices requiring dual-input charging and battery temperature monitoring.
For engineers reviewing the MCP73837T-NVI/UN datasheet, MCP73837T-NVI/UN pinout, MCP73837T-NVI/UN application, or MCP73837T-NVI/UN equivalent, this page delivers verified technical context, real-world design meanings of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Microchip's DS20002071C specification.
Technical Context
The MCP73837T-NVI/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 charge current (100 mA or 500 mA via PROG2 logic level). It integrates pass transistors, current sense, reverse discharge protection, and thermal regulation to limit die temperature during high-power operation.
It features autonomous power-source arbitration (AC adapter prioritized over USB), preconditioning for deeply depleted cells, automatic recharge at 94% VREG, and battery temperature monitoring via a 50 µA thermistor bias current on THERM. The device includes UVLO with 75 mV hysteresis (USB) and 55 mV (AC), plus shutdown when VDD ≤ VBAT – 100 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±0.5% - precisely regulates single-cell Li-Ion/Li-Polymer batteries to prevent overvoltage stress and ensure cycle life compliance. |
| AC Charge Current Range | 15 mA to 1000 mA - set by external PROG1 resistor (1 kΩ to 10 kΩ), enabling flexible system-level current tuning without firmware changes. |
| USB Charge Current Options | 100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - adheres strictly to USB 2.0 unit-load definitions for host-compliant portable charging. |
| Thermal Regulation Threshold | 150°C die temperature - dynamically reduces charge current above threshold to maintain reliability in compact enclosures with limited airflow. |
| Operating Temperature | –40°C to +85°C ambient - supports industrial and consumer portable applications across global environmental conditions. |
| Package | 10-Lead 3 mm × 3 mm DFN with exposed thermal pad - provides low θJA = 41°C/W for efficient heat dissipation in thin-profile PCB layouts. |
| Status Outputs | STAT1 and STAT2 (open-drain) - deliver unambiguous state machine feedback (precondition, fast charge, CV, complete, fault) for LED or MCU-driven UI. |
Pinout & Package
Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS. Requires EP soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VAC | AC adapter input supply | Accepts 4.4V–6V input; dominates charging when present; requires ≥4.7 µF bypass to VSS for stability. |
| VUSB | USB port input supply | Accepts 4.4V–6V input; enables USB-only charging when VAC is absent; requires ≥1 µF bypass. |
| STAT1 | Charge status output 1 | Open-drain indicator: LOW during active charge (precondition, CC, CV); HIGH-Z at completion or fault. |
| STAT2 | Charge status output 2 | Open-drain indicator: LOW only at charge completion; HIGH-Z otherwise - enables dual-LED status coding. |
| VSS | Battery and supply reference | Common 0V return for battery, inputs, and internal circuitry; must connect to EP for thermal path. |
| PROG1 | AC charge current and enable control | Resistor-to-VSS sets AC current (15–1000 mA); >70 kΩ disables device; floating = standby mode. |
| PROG2 | USB charge current select | Digital input: LOW = 100 mA, HIGH = 500 mA; also sets USB precondition/termination ratios. |
| PG | Power-good status output | Open-drain output LOW when valid input (VAC or VUSB) is present and UVLO cleared - confirms power availability. |
| THERM | Battery temperature monitor | Biased with 50 µA current; interfaces with NTC thermistor to suspend charging outside safe thermal range. |
| VBAT | Battery positive connection | Direct connection to Li-Ion/Li-Polymer anode; supplies regulated output; requires ≥1 µF bypass if battery disconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous dual-source selection | Hardware-based priority logic automatically selects AC adapter over USB - eliminates MCU intervention and software complexity. |
| Integrated reverse discharge protection | Blocks battery-to-input leakage <2 µA during shutdown - preserves battery charge when no input is applied. |
| Programmable safety timer | Configurable 4/6/8-hour timeout prevents indefinite charging - critical for unattended or embedded systems. |
| Preconditioning disable option | Factory-configured to skip trickle charge for non-deeply-discharged cells - reduces unnecessary charge time and thermal stress. |
| LDO linear regulator mode | Enables system power delivery from battery even when input is removed - supports seamless transition in portable devices. |
Applications
| Smartphones & PDAs | Portable Media Players |
|---|---|
Use Scenario: Compact handheld with dual-input (USB + wall adapter) charging and battery health monitoring. IC Role / Device Role / Timing Role: Autonomous charge controller managing CC/CV profile, source arbitration, and thermally adaptive current limiting. Use Value: Enables reliable 4.20V single-cell charging with <2 µA reverse leakage and real-time thermal fault response - extending battery lifespan and field reliability. |
Use Scenario: Battery-powered audio/video playback device requiring low-noise, space-efficient charging. IC Role / Device Role / Timing Role: Integrated linear charger providing stable 4.20V regulation, dual-status LED feedback, and LDO-mode system power hold-up. Use Value: Eliminates need for external MOSFETs, current-sense resistors, or discrete thermistor circuits - reducing BOM count and PCB area by >30%. |
| Digital Cameras | Bluetooth Headsets |
Use Scenario: Intermittent-use imaging device with rapid recharge capability and battery temperature awareness. IC Role / Device Role / Timing Role: Fast-charge manager with 500 mA USB support, 1000 mA AC support, and thermistor-based thermal cutoff. Use Value: Delivers full recharge in <2.5 hours (1200 mAh cell) while suspending charge above 150°C - preventing thermal runaway during burst usage. |
Use Scenario: Ultra-low-power wearable with strict size constraints and USB-micro charging interface. IC Role / Device Role / Timing Role: Minimal-footprint charger supporting 100 mA USB-Low mode, automatic recharge at 94% VREG, and PG confirmation of input presence. Use Value: Guarantees safe, compliant charging without MCU supervision - meeting USB-IF power delivery requirements in sub-10 mm² layout area. |
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 |
|---|---|---|---|
| MCP73831T-2DCI/OT | Single-input (USB-only), no VAC pin, 4.20V fixed, 500 mA max, no PG output, SOT-23-5 package. | Lacks AC adapter support and dual-status outputs - suitable only for USB-only, ultra-low-cost, space-limited designs. | Select when dual-input autonomy and thermistor monitoring are unnecessary and board area is severely constrained. |
| BQ24075RGTR | TI part with 4.20V regulation, 1.5A max, I2C programmability, integrated LDO, but no autonomous AC/USB arbitration logic. | Requires MCU firmware for source selection and parameter configuration - increases software overhead and validation effort. | Choose when dynamic reconfiguration (e.g., voltage adjustment, timer update) is needed and MCU resources are available. |
Compared with MCP73831T-2DCI/OT, the MCP73837T-NVI/UN adds hardware-based AC/USB arbitration and thermistor monitoring; compared with BQ24075RGTR, it eliminates I2C dependency and simplifies layout with fixed-function autonomy - making it optimal for cost-sensitive, firmware-light portable designs.
Availability
MCP73837T-NVI/UN is available at Aetrix Electronics and suitable for smartphones, portable media players, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP73837T-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, consumer, and communications markets with high-reliability silicon and development tools.
The MCP73837/8 product line was engineered specifically for autonomous, dual-input Li-Ion charging in space-constrained portable electronics - emphasizing minimal external components, thermal robustness, and USB/AC compliance without firmware dependency.
FAQ
What is the exact charge voltage regulation setting for MCP73837T-NVI/UN?
The MCP73837T-NVI/UN is factory-configured for 4.20V ±0.5% constant-voltage regulation, as confirmed in Microchip's DS20002071C Electrical Characteristics table (VREG = 4.179V to 4.221V at +25°C). This matches standard single-cell Li-Ion chemistry requirements and is not user-adjustable.
Does MCP73837T-NVI/UN support both AC adapter and USB charging simultaneously?
No - the MCP73837T-NVI/UN performs autonomous source selection: when both VAC and VUSB are present, it prioritizes the AC adapter input and disables USB charging path. Only one source powers the charge circuit at any time, per Microchip's operational flow diagram (DS20002071C, Figure 4-1).
What is the function of the PG pin on MCP73837T-NVI/UN?
The PG (Power-Good) pin on MCP73837T-NVI/UN is an open-drain output that goes LOW when a valid input supply (VAC or VUSB) is detected and UVLO conditions are satisfied. It remains LOW during active charging and is HIGH-Z only during shutdown or input removal - confirming input readiness to the system.
How does thermal regulation operate in MCP73837T-NVI/UN?
MCP73837T-NVI/UN monitors die temperature and begins reducing charge current when junction temperature approaches 150°C (typical shutdown threshold). This thermal foldback optimizes charge time under high ambient or high-power conditions while maintaining device reliability - as characterized in Figures 2-12 through 2-14 of DS20002071C.
Is the MCP73837T-NVI/UN pin-compatible with other MCP73837 variants?
Yes - MCP73837T-NVI/UN shares identical 10-lead DFN pinout and electrical behavior with all MCP73837 family members (e.g., MCP73837T-2ADI/UN, MCP73837T-3DCI/UN), differing only in factory-programmed voltage option (4.20V vs. 4.35V/4.40V/4.50V) and temperature grade. No PCB redesign is required when substituting within the same package variant.
MCP73837T-NVI/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:
- 4.35V
- Voltage - Supply (Max):
- 6V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MCP73837T-NVI/UN FAQ
1.How can I place an order for MCP73837T-NVI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73837T-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 MCP73837T-NVI/UN reliable?
The price and inventory of MCP73837T-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 MCP73837T-NVI/UN is usually 5 days.
3.What payment methods are accepted for MCP73837T-NVI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837T-NVI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73837T-NVI/UN?
MCP73837T-NVI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73837T-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 MCP73837T-NVI/UN?
For technical support, including MCP73837T-NVI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837T-NVI/UN requirements.
6.How does Aetrix verify that MCP73837T-NVI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73837T-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 MCP73837T-NVI/UN meets industry standards.
7.What is the process for return or replacement of MCP73837T-NVI/UN?
All MCP73837T-NVI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837T-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 MCP73837T-NVI/UN part is unused and in its original packaging.
Return procedure for MCP73837T-NVI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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