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Microchip Technology MCP73834T-NVI/UN
- Part No.:
- MCP73834T-NVI/UN
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73834T-NVI/UN.pdf
- Description:
- IC BATT CNTRL LI-ION 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,235
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Product details
Overview
MCP73834T-NVI/UN from Microchip Technology is a stand-alone linear Li-ion/Li-polymer charge management controller in a 10-lead DFN-3×3 package, featuring integrated P-channel MOSFET pass transistor, ±0.75% voltage regulation (4.20 V, 4.35 V, 4.40 V, or 4.50 V), programmable fast-charge current up to 1 A via single PROG resistor, and thermal regulation for reliability in portable USB-powered devices.
For engineers reviewing the MCP73834T-NVI/UN datasheet, MCP73834T-NVI/UN pinout, MCP73834T-NVI/UN application, or MCP73834T-NVI/UN equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all aligned with DS22005B specifications and Microchip's official product identification system.
Technical Context
The MCP73834T-NVI/UN implements a constant-current/constant-voltage (CC/CV) charging algorithm with factory-programmed voltage regulation options (4.20 V–4.50 V), selectable preconditioning and termination thresholds, and automatic recharge based on VBAT voltage ratio to VREG. Its internal 50 µA thermistor bias current and dual comparator thresholds (1.23 V / 0.25 V) enable precise NTC-based temperature qualification.
This variant includes the Timer Enable (TE) input (Pin 7), distinguishing it from the MCP73833 series; TE supports 1.8 V logic-level control to suspend the internal safety timer during system-load-powered charging. It lacks the PG output found on MCP73833, confirming its identity as the MCP73834 family member per Microchip's Product Identification System.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.20 V, 4.35 V, 4.40 V, or 4.50 V ±0.75% - factory-set option determines battery chemistry compatibility and end-of-charge voltage accuracy. |
| Max Fast-Charge Current | 1000 mA - set by external PROG resistor (e.g., 1.0 kΩ); limited by thermal regulation above ~105°C junction temperature. |
| Preconditioning Ratio | 7.5–100% of IREG - selectable via device variant; enables safe trickle-charge for deeply depleted cells below VPTH = 66.5% × VREG. |
| Charge Termination Ratio | 3.75–25% of IREG - factory-configured; ensures full saturation without overcharge by halting when average current falls below threshold. |
| Thermal Shutdown | 150°C ±10°C - die temperature limit with hysteresis; suspends charging until cooling, providing secondary safety beyond thermal regulation. |
| UVLO Threshold | VSTART = 3.55 V (typ), VHYS = 100 mV - prevents operation below minimum input; ensures no reverse discharge when VDD drops near VBAT. |
| Package | DFN-10 (3 mm × 3 mm) with exposed thermal pad (EP) - electrically tied to VSS; θJA = 41°C/W enables high-power density in space-constrained designs. |
Pinout & Package
Package: DFN-10 (3 mm × 3 mm), leadless, with exposed thermal pad (EP) internally connected to VSS. Requires soldering EP to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VDD | Battery management input supply (3.75–6 V); bypassed to VSS with ≥1 µF capacitor; triggers UVLO shutdown if <3.4 V. |
| 3 | STAT1 | Open-drain status output; low during charging, high-impedance at EOC; drives LED or microcontroller input. |
| 4 | STAT2 | Open-drain status output; high-impedance during charging, low at EOC; complements STAT1 for dual-state indication. |
| 5 | VSS | 0 V reference for battery, input supply, and internal circuitry; must connect to EP for thermal and electrical stability. |
| 6 | PROG | Current regulation set input; resistor to VSS programs IREG (1000 V/RPROG); floating disables charge and limits reverse leakage to ≤2 µA. |
| 7 | TE | Timer Enable input (MCP73834-specific); low enables internal safety timer, high disables it; compatible with 1.8 V logic. |
| 8 | THERM | Thermistor bias input; 50 µA current source for 10 kΩ NTC; compares voltage to 1.23 V / 0.25 V thresholds to halt charging on temp fault. |
| 9, 10 | VBAT | Battery charge control output; drain of internal P-MOSFET; connects to battery positive terminal; bypassed with ≥1 µF (≤250 mA) or ≥4.7 µF (>250 mA). |
| 11 | EP | Exposed thermal pad; electrically tied to VSS; must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Pass Transistor | P-channel MOSFET with 300 mΩ typical RDS(ON) - eliminates external FET, reduces BOM count, and simplifies layout for compact USB chargers. |
| Thermal Regulation | Dynamic current reduction above ~105°C junction - maintains safe die temperature while maximizing charge rate under varying ambient conditions. |
| Programmable Safety Timer | Configurable 3.6–8.8 hour elapsed period - prevents indefinite charging; disabled via TE pin for system-load-powered applications. |
| Reverse Discharge Protection | Output leakage <2 µA when VDD removed - prevents battery self-discharge through the IC, critical for long shelf-life in portable devices. |
| System Test (LDO) Mode | VBAT regulated to VREG with up to IREG current - enables battery-less system validation using THERM pin override, supporting design verification. |
Applications
| USB-Powered Portable Charger | Smart Wearable Battery Management |
|---|---|
|
Use Scenario: Charging a 3.7 V Li-polymer cell from a 5 V USB port in a fitness tracker with space constraint ≤100 mm² PCB area. IC Role / Device Role / Timing Role: Stand-alone CC/CV charger with integrated pass FET, thermistor monitoring, and automatic recharge - manages full charge cycle without host MCU intervention. Use Value: Eliminates need for external current-sense resistor and discrete protection FET; 41°C/W θJA enables 1 A charging in ultra-thin enclosures without heatsinking. |
Use Scenario: Powering a Bluetooth earbud case with dual 3.7 V cells, requiring temperature-aware charging and low quiescent current during storage. IC Role / Device Role / Timing Role: Linear charge controller with NTC-based thermal qualification and <100 µA standby current - ensures safe charging across -40°C to +85°C ambient range. Use Value: Factory-set 4.20 V regulation and 50 µA THERM bias guarantee accurate NTC reading; reverse leakage <0.25 µA preserves battery charge during 6-month shelf life. |
| Industrial Handheld Scanner | Medical Sensor Patch |
|
Use Scenario: Recharging a 1000 mAh Li-ion pack in a ruggedized barcode scanner used in warehouses with intermittent USB power access. IC Role / Device Role / Timing Role: Autonomous charger with automatic recharge (94% VREG threshold) and UVLO hysteresis - recovers from brownouts without manual reset. Use Value: 100 mV UVLO hysteresis prevents oscillation during unstable input; TE pin allows disabling safety timer when system load draws >500 mA during charging. |
Use Scenario: Enabling multi-day operation of a disposable skin patch with embedded 200 mAh Li-polymer cell and strict safety certification requirements. IC Role / Device Role / Timing Role: Certified-compliant linear charger with dual thermal fault detection (upper/lower thresholds) and thermal shutdown - meets IEC 62368-1 thermal safety mandates. Use Value: 150°C thermal shutdown with 10°C hysteresis provides fail-safe cutoff; ±0.75% VREG tolerance satisfies medical-grade voltage accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73833T-FCI/UN | Includes PG (Power Good) output instead of TE; same DFN-10 package and 4.20 V regulation; no timer disable capability. | Suitable where input power presence indication is required, but timer suspension during system-load operation is unnecessary. | Select MCP73833T-FCI/UN only if PG signal is needed for host MCU power sequencing and TE functionality is not required. |
| BQ24075TRGTR | TI part with 4.2 V fixed regulation, 1.5 A max current, and integrated LDO; different pinout (16-pin QFN), no TE/PG distinction, requires external sense resistor. | Used in higher-current applications where integrated LDO for system rail is beneficial, but adds complexity and board area. | Choose BQ24075TRGTR only when >1 A charge current or auxiliary LDO output is mandatory; not pin-compatible or functionally identical. |
Compared with MCP73833T-FCI/UN, the MCP73834T-NVI/UN trades PG output for TE control - enabling safer concurrent charging and system operation. Against BQ24075TRGTR, it offers simpler BOM (no external sense resistor) and smaller footprint, but lower max current and no integrated LDO.
Availability
MCP73834T-NVI/UN is available at Aetrix Electronics and suitable for USB-powered portable chargers, smart wearables, industrial handheld scanners, and medical sensor patches requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability.
Supply support for MCP73834T-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 global semiconductor company specializing in microcontrollers, analog devices, and interface ICs, with a focus on robust, low-power, and highly integrated solutions for embedded systems.
The MCP73833/4 product line was designed specifically for cost-sensitive, space-constrained Li-ion/Li-polymer charging in portable electronics - delivering full-featured linear charge control with minimal external components and factory-configurable parameters.
FAQ
What is the factory-set voltage regulation option for MCP73834T-NVI/UN?
The MCP73834T-NVI/UN is configured for 4.20 V ±0.75% constant-voltage regulation, as indicated by the "N" in the Microchip part numbering scheme (per DS22005B Section 1.0 and Product Identification System). This matches standard single-cell Li-ion battery requirements and is confirmed by electrical characteristics tables showing 4.168–4.232 V min/typ/max at 25°C.
Does MCP73834T-NVI/UN support thermistor-based temperature monitoring?
Yes, MCP73834T-NVI/UN supports thermistor-based temperature monitoring via the THERM pin, which sources a precise 50 µA (47–53 µA) bias current for 10 kΩ NTC thermistors. It compares the resulting voltage against factory-set thresholds (1.23 V upper, 0.25 V lower) and suspends charging immediately upon violation - a core safety feature documented in Sections 3.7 and 4.9 of DS22005B.
How is the fast-charge current programmed on MCP73834T-NVI/UN?
The fast-charge current for MCP73834T-NVI/UN is programmed using a single external resistor (RPROG) from the PROG pin to VSS, calculated as IREG = 1000 V / RPROG (with RPROG in kΩ and IREG in mA). For example, a 1.0 kΩ resistor sets 1000 mA; a 10 kΩ resistor sets 100 mA. This relationship is specified in Equation 4-1 and verified across DC characteristics tables in DS22005B.
What is the function of Pin 7 (TE) on MCP73834T-NVI/UN?
Pin 7 on MCP73834T-NVI/UN is the Timer Enable (TE) input - a defining feature that distinguishes it from the MCP73833 series. A logic-low signal enables the internal safety timer (3.6–8.8 hours), while logic-high disables it. This allows concurrent battery charging and system load operation without timer-induced premature termination, as detailed in Section 3.6 and Figure 4-1 of DS22005B.
Can MCP73834T-NVI/UN operate without a battery connected?
Yes, MCP73834T-NVI/UN can operate in System Test (LDO) mode without a battery: drive the THERM pin above (VDD − 100 mV) while leaving VBAT unconnected. In this mode, it regulates VBAT to the factory-set VREG (4.20 V) with current limited to the programmed IREG, enabling battery-less system validation - a capability explicitly defined in Section 5.1.4.1 of DS22005B.
MCP73834T-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:
- Current
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 1.1A
- Battery Pack Voltage:
- 4.35V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MCP73834T-NVI/UN FAQ
1.How can I place an order for MCP73834T-NVI/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73834T-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 MCP73834T-NVI/UN reliable?
The price and inventory of MCP73834T-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 MCP73834T-NVI/UN is usually 5 days.
3.What payment methods are accepted for MCP73834T-NVI/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73834T-NVI/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73834T-NVI/UN?
MCP73834T-NVI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73834T-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 MCP73834T-NVI/UN?
For technical support, including MCP73834T-NVI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73834T-NVI/UN requirements.
6.How does Aetrix verify that MCP73834T-NVI/UN is sourced from the original manufacturer or authorized distributors?
All MCP73834T-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 MCP73834T-NVI/UN meets industry standards.
7.What is the process for return or replacement of MCP73834T-NVI/UN?
All MCP73834T-NVI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73834T-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 MCP73834T-NVI/UN part is unused and in its original packaging.
Return procedure for MCP73834T-NVI/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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