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Microchip Technology MCP73833-CNI/MF
- Part No.:
- MCP73833-CNI/MF
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP73833-CNI/MF.pdf
- Description:
- IC BATT CONTRL LI-ION 1CEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
MCP73833-CNI/MF from Microchip Technology is a stand-alone linear Li-ion/Li-polymer charge management controller in a 10-lead DFN-10 (3 mm × 3 mm) package. It delivers constant-current/constant-voltage charging with thermal regulation, 4.20 V ±0.75% voltage regulation, up to 1 A programmable charge current, and integrated reverse discharge protection - enabling compact, USB-compliant battery charging in portable electronics.
For engineers reviewing the MCP73833-CNI/MF datasheet, MCP73833-CNI/MF pinout, MCP73833-CNI/MF application, or MCP73833-CNI/MF equivalent, key selection considerations include its factory-set 4.20 V regulation, PROG-resistor-based current programming, dual STAT outputs for LED/microcontroller status indication, and thermistor-based temperature monitoring with 1.23 V / 0.25 V thresholds.
Technical Context
The MCP73833-CNI/MF implements a fully integrated linear charging architecture with an internal P-channel MOSFET pass transistor (RDS(ON) = 300 mΩ), precision reference generator (1.21 V), and ratiometric current scaling logic. Its preconditioning, fast-charge, constant-voltage, and automatic-recharge states are managed by analog comparators and digital state logic with 1 ms filter times on critical transitions.
It supports system-level safety via UVLO (3.55 V start, 3.45 V stop), thermal regulation (current reduction above ~105 °C), and thermal shutdown (150 °C with 10 °C hysteresis). The THERM pin provides a 50 µA bias current for NTC/PTC thermistors, and the PG output signals input power presence when VDD exceeds UVLO and remains above VBAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation | 4.20 V ±0.75% - factory-trimmed for single-cell Li-ion compliance; ensures safe full-charge termination without overvoltage risk. |
| Max Charge Current | 1000 mA - set by external PROG resistor (e.g., 1.0 kΩ); enables rapid charging of 500–2000 mAh batteries. |
| Thermal Regulation | Active current limiting above ~105 °C - maintains reliability under high ambient or high-power conditions without external thermal sensors. |
| Precondition Threshold | 66.5% of VREG (2.79 V typical) - triggers trickle charge for deeply depleted cells to prevent damage before fast charge. |
| Charge Termination Ratio | 5% of IREG - ends CV phase when current drops to 50 mA (at 1 A setting), preventing overcharge and extending cycle life. |
| THERM Bias Current | 50 µA ±6% - powers standard 10 kΩ NTC thermistors; enables accurate temperature qualification across -40°C to +85°C ambient. |
| UVLO Hysteresis | 100 mV - prevents oscillation during input voltage ramp-up/down; ensures clean entry/exit from shutdown mode. |
Pinout & Package
Package: DFN-10 (3 mm × 3 mm), exposed thermal pad (EP) electrically connected to VSS. Requires PCB thermal relief and solder paste stencil optimization for reliable heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1,2) | Battery management input supply | Accepts 3.75–6 V input; powers internal circuitry and enables UVLO detection; bypass with ≥1 µF to VSS. |
| STAT1, STAT2 (Pins 3,4) | Open-drain charge status outputs | Drive LEDs or microcontroller GPIOs; encode charge state (e.g., STAT1=LOW/STAT2=Hi-Z = fast charge active). |
| VSS (Pin 5) | 0 V reference | Common ground for battery negative, input supply return, and EP connection; must be low-impedance. |
| PROG (Pin 6) | Current regulation set and enable | Resistor to VSS sets IREG (1000/RPROG mA); floating disables charging and limits reverse discharge to <2 µA. |
| PG (Pin 7) | Power good indicator | Pseudo open-drain output; sinks current only when VDD > UVLO threshold and VDD > VBAT - confirms valid input power. |
| THERM (Pin 8) | Thermistor input | 50 µA bias source; compares voltage to 1.23 V (high-temp trip) and 0.25 V (low-temp trip); fault halts charging immediately. |
| VBAT (Pins 9,10) | Battery charge control output | Drain of internal P-MOSFET; connects directly to battery positive; requires ≥4.7 µF ceramic capacitor for stability at >250 mA. |
| EP (Pin 11) | Exposed thermal pad | Internally tied to VSS; must be soldered to large copper pour for θJA = 41 °C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pass transistor | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained designs. |
| Programmable preconditioning | Enables safe recovery of deeply discharged cells (e.g., <2.8 V) using user-selectable current ratio and voltage threshold. |
| Automatic recharge | Reinitiates charging when battery voltage drops to 94% of VREG (3.95 V at 4.20 V setting), maintaining full capacity without manual intervention. |
| Low-dropout LDO mode | Activates when THERM > (VDD – 100 mV) with no battery; supplies regulated VREG to system load up to programmed IREG limit. |
| USB-compliant operation | Meets USB 2.0 power bus specifications (5 V ±5%, current limiting, thermal management) for direct USB port charging. |
Applications
| Personal Data Assistants | Bluetooth Headsets |
|---|---|
Use Scenario: Charging a 1200 mAh Li-polymer battery in a handheld PDA with limited PCB real estate and no dedicated charger IC space. IC Role / Device Role / Timing Role: Stand-alone linear charge controller managing CC/CV profile, thermal foldback, and end-of-charge signaling via STAT pins. Use Value: Enables full-featured charging with only one external resistor (PROG) and two capacitors - reducing component count by 40% vs. discrete solutions. | Use Scenario: Integrating battery charging into a compact Bluetooth headset with strict thermal limits and need for automatic top-off after partial discharge. IC Role / Device Role / Timing Role: Dual-role device: charges battery during idle, then switches to LDO mode to power audio circuitry when battery is disconnected. Use Value: Eliminates need for separate LDO and charger ICs; automatic recharge maintains 100% SOC between usage sessions without host MCU involvement. |
| Digital Cameras | USB Chargers |
Use Scenario: Fast-charging a 1500 mAh Li-ion pack in a DSLR grip accessory powered from a 5 V wall adapter. IC Role / Device Role / Timing Role: High-current linear charger with thermal regulation ensuring safe 1 A charge even during extended use in warm environments. Use Value: Delivers 30% faster recharge vs. 500 mA solutions while maintaining die temperature below 110 °C - verified per θJA = 41 °C/W DFN-10 rating. | Use Scenario: Designing a universal USB-A wall charger supporting multiple battery chemistries and capacities. IC Role / Device Role / Timing Role: USB-compliant charge controller with UVLO hysteresis, reverse discharge protection, and PG output confirming valid upstream power. Use Value: Ensures robust operation across variable USB source voltages (4.75–5.25 V); PG signal allows host firmware to validate input before enabling charging. |
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 |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2 V regulation; no selectable VREG option; 1.5 A max current; integrated LDO for system power. | Lacks programmable preconditioning and automatic recharge thresholds; includes integrated 100 mA LDO not present in MCP73833-CNI/MF. | Select BQ24075RGTR when higher current and auxiliary LDO are required; choose MCP73833-CNI/MF for tighter voltage tolerance (±0.75%) and flexible thermal/termination configuration. |
| TP4056 | Fixed 4.2 V regulation; no thermistor interface; no PG output; 1 A max current; no preconditioning or timer fault detection. | Minimal feature set - suitable only for basic charging; lacks safety features like temperature monitoring and timer-based termination. | Select TP4056 for ultra-low-cost, non-safety-critical applications; MCP73833-CNI/MF is preferred where NTC-based thermal qualification and multi-stage charge control are mandatory. |
Compared with BQ24075RGTR and TP4056, the MCP73833-CNI/MF offers superior voltage accuracy, configurable preconditioning/recharge thresholds, and dedicated thermistor monitoring - making it optimal for industrial-grade portable devices requiring repeatable, safe, and field-proven charge management.
Availability
MCP73833-CNI/MF is available at Aetrix Electronics and suitable for personal data assistants, Bluetooth headsets, digital cameras, and USB chargers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP73833-CNI/MF 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 components, and interface ICs, with deep expertise in power management and embedded control solutions.
The MCP73833-CNI/MF belongs to Microchip's linear battery charger product line, designed specifically for cost-sensitive, space-constrained portable applications requiring high-accuracy, thermally robust, and USB-compliant Li-ion/Li-polymer charging.
FAQ
What is the factory-set voltage regulation for MCP73833-CNI/MF?
The MCP73833-CNI/MF has a factory-trimmed constant-voltage regulation of 4.20 V ±0.75%, optimized for standard single-cell Li-ion and Li-polymer batteries. This value is fixed and not user-programmable - unlike other variants in the MCP73833/4 family (e.g., MCP73833-FCI/MF at 4.35 V). The MCP73833-CNI/MF achieves this accuracy through on-die trimming during final test, ensuring compliance with JEITA and IEC 62133 battery safety standards.
How does the PROG pin configure charge current in MCP73833-CNI/MF?
The PROG pin sets the fast-charge current (IREG) using a single resistor to VSS, calculated as IREG = 1000 / RPROG (mA, with RPROG in kΩ). For example, a 1.0 kΩ resistor yields 1000 mA; a 10 kΩ resistor yields 100 mA. The MCP73833-CNI/MF also scales preconditioning and termination currents as fixed percentages of IREG - e.g., preconditioning defaults to 10% of IREG, and termination to 5% - all ratiometric and independent of VDD or temperature drift.
What happens if the THERM pin is left unconnected on MCP73833-CNI/MF?
If the THERM pin is left floating, the MCP73833-CNI/MF enters temperature fault mode immediately upon power-up: the pass transistor turns off, STAT1 and STAT2 go high-impedance, PG goes low, and charging halts permanently until THERM is properly biased. To disable temperature monitoring safely, connect a 10 kΩ resistor from THERM to VSS - this pulls the pin to ~0.5 V, within the valid 0.25–1.23 V window, allowing normal operation without NTC feedback.
Can MCP73833-CNI/MF operate as a linear regulator without a battery?
Yes - the MCP73833-CNI/MF supports System Test (LDO) Mode. When the THERM pin voltage exceeds (VDD – 100 mV) and no battery is connected to VBAT, the device regulates VBAT to its factory-set 4.20 V output, sourcing up to the programmed IREG current. This mode is useful for powering system loads during development or battery-less operation, with stability ensured by ≥4.7 µF output capacitance for loads >250 mA.
What is the function of the PG pin on MCP73833-CNI/MF, and how should it be used?
The PG (Power Good) pin on MCP73833-CNI/MF is a pseudo open-drain output that sinks current only when VDD exceeds the UVLO threshold (≥3.55 V) and remains > VBAT. It must be pulled up to VDD (not VBAT or another rail) due to an internal diode path. PG provides system-level confirmation of valid input power - enabling host firmware to gate charging enable signals or initiate boot sequences only when upstream power is stable and sufficient.
MCP73833-CNI/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
MCP73833-CNI/MF FAQ
1.How can I place an order for MCP73833-CNI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73833-CNI/MF 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 MCP73833-CNI/MF reliable?
The price and inventory of MCP73833-CNI/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73833-CNI/MF is usually 5 days.
3.What payment methods are accepted for MCP73833-CNI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73833-CNI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73833-CNI/MF?
MCP73833-CNI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73833-CNI/MF 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 MCP73833-CNI/MF?
For technical support, including MCP73833-CNI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73833-CNI/MF requirements.
6.How does Aetrix verify that MCP73833-CNI/MF is sourced from the original manufacturer or authorized distributors?
All MCP73833-CNI/MF 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 MCP73833-CNI/MF meets industry standards.
7.What is the process for return or replacement of MCP73833-CNI/MF?
All MCP73833-CNI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP73833-CNI/MF, 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 MCP73833-CNI/MF part is unused and in its original packaging.
Return procedure for MCP73833-CNI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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