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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Microchip Technology MCP73833T-CNI/UN

Name: MCP73833T-CNI/UN
Brand: Microchip Technology
SKU: MCP73833T-CNI/UN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73833T-CNI/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP73833T-CNI/UN.pdf

Description:: IC BATT CNTRL LI-ION 1CEL 10MSOP

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Product details

Overview

MCP73833T-CNI/UN from Microchip Technology is a stand-alone linear Li-ion/Li-polymer battery charge management controller in a 10-lead DFN-10 (3 mm × 3 mm) package. It delivers constant-current/constant-voltage charging with thermal regulation, ±0.75% voltage accuracy at 4.20 V, programmable up to 1 A charge current via external PROG resistor, and integrated reverse discharge protection. It is designed for USB-powered portable devices requiring compact, low-component-count battery charging.

For engineers reviewing the MCP73833T-CNI/UN datasheet, MCP73833T-CNI/UN pinout, MCP73833T-CNI/UN application, or MCP73833T-CNI/UN equivalent, key selection criteria include its factory-set 4.20 V regulation voltage, DFN-10 thermal performance (θ_JA = 41 °C/W), dual status outputs (STAT1/STAT2), thermistor-based temperature monitoring, and PG output for input power validation - all critical for space-constrained, thermally sensitive battery systems.

Technical Context

The MCP73833T-CNI/UN implements a fully integrated linear charging architecture with an internal P-channel MOSFET pass transistor (R_DS(on) = 300 mΩ), precision reference generator (1.21 V), and ratiometric current sensing. Its charge algorithm includes preconditioning (trickle charge), fast-charge CC mode, CV regulation, automatic termination (based on I_TERM/I_REG ratio), and automatic recharge triggered by V_RTH/V_REG = 94.0%.

Thermal regulation dynamically reduces charge current above ~105 °C to prevent die overheating, while independent thermal shutdown activates at T_J = 150 °C (10 °C hysteresis). The device supports system test (LDO) mode when THERM > V_DD − 100 mV, enabling regulated output without a battery.

Key Specifications

Parameter	Value and Actual Design Meaning
Voltage Regulation	4.20 V ± 0.75% - precise single-cell Li-ion termination voltage ensuring battery longevity and safety compliance
Max Charge Current	1000 mA - set via external PROG resistor (e.g., 1.0 kΩ), enabling full-rate charging of 1000–2000 mAh cells
Thermal Resistance	θ_JA = 41 °C/W - optimized for DFN-10 package on 4-layer board, supporting high-power operation without forced cooling
Precondition Threshold	V_PTH/V_REG = 66.5% - triggers trickle charge below ~2.77 V to safely recover deeply depleted cells
Charge Termination Ratio	I_TERM/I_REG = 5% - ends fast charge when current drops to 50 mA (at 1 A setting), preventing overcharge
UVLO Thresholds	V_START = 3.55 V, V_STOP = 3.45 V - ensures reliable startup/shutdown during USB VBUS transitions
THERM Bias Current	50 µA ±6% - drives standard 10 kΩ NTC thermistors for accurate battery temperature qualification

Pinout & Package

Package: DFN-10 (3 mm × 3 mm), exposed thermal pad (EP) electrically connected to VSS. EP must be soldered to PCB ground plane for thermal and electrical integrity.

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 (Pin 3)	Charge status output	Open-drain indicator: LOW during charging, Hi-Z at end-of-charge - drives LED or MCU GPIO
STAT2 (Pin 4)	Charge status output	Open-drain indicator: Hi-Z during charging, LOW at end-of-charge - complements STAT1 for dual-state signaling
VSS (Pin 5)	0 V reference	Common ground for battery negative, input supply, and EP; mandatory return path for all currents
PROG (Pin 6)	Current regulation set	Connects to VSS via resistor to program I_REG; floating disables charger and limits reverse discharge to <2 µA
PG (Pin 7)	Power good indication	Pseudo open-drain output: LOW when VDD > UVLO threshold and VDD > VBAT - confirms valid input power
THERM (Pin 8)	Thermistor input	50 µA bias source for NTC/PTC; compares to 1.23 V / 0.25 V thresholds to suspend charge on temperature fault
VBAT (Pins 9, 10)	Battery charge control output	Drain of internal P-MOSFET; connects directly to battery positive; bypass with ≥4.7 µF for >250 mA stability
EP (Pin 11)	Exposed thermal pad	Internally tied to VSS; must be soldered to PCB ground pour to achieve θ_JA = 41 °C/W and ensure reliability

Key Features

Feature	Design Value
Integrated pass transistor	Eliminates external MOSFET and gate driver, reducing BOM count and layout area in portable designs
Thermal regulation with foldback	Automatically scales down charge current above ~105 °C to maintain safe junction temperature without external sensors
Factory-set 4.20 V regulation	Meets JEITA-compliant Li-ion termination voltage with ±0.75% tolerance, eliminating external voltage-setting components
Dual open-drain status outputs	Enables flexible visual (LED) or digital (MCU) state reporting - e.g., STAT1=LOW + STAT2=Hi-Z = charging active
System test (LDO) mode	Allows VBAT to function as a regulated 4.20 V LDO (current-limited by PROG) for battery-less system validation

Applications

USB-Powered Portable Devices	Wearable Health Monitors
Use Scenario: Charging compact electronics (e.g., Bluetooth headsets, MP3 players) directly from USB 2.0 ports with strict 500 mA current limits. IC Role / Device Role / Timing Role: Stand-alone linear charger managing CC/CV profile, UVLO, and thermal safety without host MCU intervention. Use Value: Enables full compliance with USB power specifications while delivering ±0.75% voltage accuracy and automatic end-of-charge detection.	Use Scenario: Recharging small-form-factor wearable devices (e.g., pulse oximeters, ECG patches) with embedded Li-polymer batteries. IC Role / Device Role / Timing Role: Battery management controller providing preconditioning, temperature-monitored charging, and dual-status feedback to low-power microcontrollers. Use Value: Ensures safe recovery of deeply discharged cells and prevents thermal runaway using integrated 50 µA thermistor bias and dual voltage thresholds.
Industrial Handheld Terminals	Smart Home Sensors
Use Scenario: Powering ruggedized barcode scanners or RFID readers with replaceable Li-ion packs in field-deployed environments. IC Role / Device Role / Timing Role: Primary charge controller handling wide ambient temperature range (−40°C to +85°C) and automatic recharge after partial discharge. Use Value: Delivers robust operation across industrial temperature extremes and maintains battery readiness via VRTH/VREG = 94.0% automatic recharge threshold.	Use Scenario: Enabling multi-year battery life in battery-operated Zigbee/Z-Wave sensors by minimizing quiescent current during standby. IC Role / Device Role / Timing Role: Low-quiescent charger (150–300 µA in charge-complete mode) with reverse discharge protection (<2 µA leakage). Use Value: Extends shelf life and operational runtime by eliminating parasitic battery drain when input power is absent or PROG is floating.

USB-Powered Portable Devices

Wearable Health Monitors

Use Scenario: Charging compact electronics (e.g., Bluetooth headsets, MP3 players) directly from USB 2.0 ports with strict 500 mA current limits.

IC Role / Device Role / Timing Role: Stand-alone linear charger managing CC/CV profile, UVLO, and thermal safety without host MCU intervention.

Use Value: Enables full compliance with USB power specifications while delivering ±0.75% voltage accuracy and automatic end-of-charge detection.

Use Scenario: Recharging small-form-factor wearable devices (e.g., pulse oximeters, ECG patches) with embedded Li-polymer batteries.

IC Role / Device Role / Timing Role: Battery management controller providing preconditioning, temperature-monitored charging, and dual-status feedback to low-power microcontrollers.

Use Value: Ensures safe recovery of deeply discharged cells and prevents thermal runaway using integrated 50 µA thermistor bias and dual voltage thresholds.

Industrial Handheld Terminals

Smart Home Sensors

Use Scenario: Powering ruggedized barcode scanners or RFID readers with replaceable Li-ion packs in field-deployed environments.

IC Role / Device Role / Timing Role: Primary charge controller handling wide ambient temperature range (−40°C to +85°C) and automatic recharge after partial discharge.

Use Value: Delivers robust operation across industrial temperature extremes and maintains battery readiness via VRTH/VREG = 94.0% automatic recharge threshold.

Use Scenario: Enabling multi-year battery life in battery-operated Zigbee/Z-Wave sensors by minimizing quiescent current during standby.

IC Role / Device Role / Timing Role: Low-quiescent charger (150–300 µA in charge-complete mode) with reverse discharge protection (<2 µA leakage).

Use Value: Extends shelf life and operational runtime by eliminating parasitic battery drain when input power is absent or PROG is floating.

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 factory-selectable voltage options; requires external MOSFET for >500 mA; higher quiescent current (55 µA vs. 150 µA in charge-complete mode)	Lacks integrated pass transistor and thermal regulation foldback - needs external thermal design oversight	Choose when cost sensitivity outweighs integration level and thermal autonomy requirements
MCP73831T-2DCI/OT	Single-pin variant (SOT-23-5); fixed 4.2 V; no PG output; no THERM input; lower max current (500 mA); same DFN-10 pin-compatible footprint but fewer features	Targeted at ultra-low-cost, minimal-feature applications where temperature monitoring and power-good signaling are omitted	Choose only if design eliminates thermistor use and requires smallest possible footprint with reduced functionality

Compared with BQ24075RGTR and MCP73831T-2DCI/OT, the MCP73833T-CNI/UN provides superior thermal autonomy via integrated foldback regulation, factory-trimmed 4.20 V accuracy, and complete feature parity (PG, THERM, dual STAT) in the same DFN-10 package - making it optimal for USB-powered portable systems demanding reliability and minimal external components.

Availability

MCP73833T-CNI/UN is available at Aetrix Electronics and suitable for USB chargers, wearable health monitors, industrial handheld terminals, and smart home sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MCP73833T-CNI/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, interface, and power management ICs, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The MCP73833/4 product line was designed specifically for space-constrained, cost-sensitive portable electronics requiring fully integrated, thermally robust linear Li-ion charging - eliminating external pass transistors, current sense resistors, and discrete protection components.

FAQ

What is the factory-set voltage regulation value for the MCP73833T-CNI/UN?

The MCP73833T-CNI/UN has a factory-set constant-voltage regulation point of 4.20 V with ±0.75% accuracy across −40°C to +85°C. This value is laser-trimmed and not user-adjustable; other variants in the MCP73833/4 family offer 4.35 V, 4.40 V, or 4.50 V options, but the -CNI/UN suffix specifically denotes the 4.20 V version. The MCP73833T-CNI/UN meets JEITA standards for single-cell Li-ion termination.

How does the MCP73833T-CNI/UN implement thermal regulation, and what is its effect on charge current?

The MCP73833T-CNI/UN uses die-temperature-dependent current foldback: as junction temperature exceeds ~105°C, it progressively reduces charge current to maintain safe operating conditions. At 125°C, typical output drops to ~600 mA (for R_PROG = 1 kΩ), and at 150°C, thermal shutdown suspends charging entirely. This behavior is intrinsic to the IC's analog design and requires no external components. The MCP73833T-CNI/UN resumes normal operation once temperature falls ~10°C below the shutdown threshold.

Can the MCP73833T-CNI/UN be used without a thermistor, and what is the recommended alternative?

Yes - the MCP73833T-CNI/UN can operate without a thermistor. If temperature monitoring is not required, connect a 10 kΩ resistor from THERM to VSS to establish a fixed bias point within the valid comparator window (0.25 V to 1.23 V). This satisfies the input condition and prevents false thermal faults. The MCP73833T-CNI/UN will then perform full CC/CV charging without suspension due to temperature. No firmware or external logic is needed to disable this function.

What is the function of the PG pin on the MCP73833T-CNI/UN, and how should it be interfaced?

The PG (Power Good) pin on the MCP73833T-CNI/UN is a pseudo open-drain output that sinks current when VDD exceeds the UVLO threshold (≥3.55 V) and VDD > VBAT. It must be pulled up only to VDD (not to another rail) due to an internal diode path. PG = LOW indicates valid input power presence and proper VDD-VBAT relationship - useful for system power sequencing. The MCP73833T-CNI/UN specifies 15–25 mA sink capability and ≤1 V low-level voltage at 4 mA load.

Does the MCP73833T-CNI/UN support automatic recharge, and what triggers it?

Yes, the MCP73833T-CNI/UN supports automatic recharge with a factory-set threshold of V_RTH/V_REG = 94.0%, meaning recharge initiates when battery voltage drops to ~3.95 V (at 4.20 V regulation). This occurs in Charge Complete mode and restarts the full CC/CV cycle. The threshold is fixed and non-adjustable; no external components or configuration are required. The MCP73833T-CNI/UN ensures battery remains at optimal state-of-charge without host MCU involvement.

MCP73833T-CNI/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:: 4.2V

Voltage - Supply (Max):: 6V

Interface:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MCP73833T-CNI/UN FAQ

1.How can I place an order for MCP73833T-CNI/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73833T-CNI/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 MCP73833T-CNI/UN reliable?

The price and inventory of MCP73833T-CNI/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73833T-CNI/UN is usually 5 days.

3.What payment methods are accepted for MCP73833T-CNI/UN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73833T-CNI/UN transactions.

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4.How is shipping managed for MCP73833T-CNI/UN?

MCP73833T-CNI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73833T-CNI/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 MCP73833T-CNI/UN?

For technical support, including MCP73833T-CNI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73833T-CNI/UN requirements.

6.How does Aetrix verify that MCP73833T-CNI/UN is sourced from the original manufacturer or authorized distributors?

All MCP73833T-CNI/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 MCP73833T-CNI/UN meets industry standards.

7.What is the process for return or replacement of MCP73833T-CNI/UN?

All MCP73833T-CNI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73833T-CNI/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 MCP73833T-CNI/UN part is unused and in its original packaging.

Return procedure for MCP73833T-CNI/UN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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