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

Microchip Technology MCP73833T-BZI/UN

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

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Part No.:: MCP73833T-BZI/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

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

Datasheet:: MCP73833T-BZI/UN.pdf

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

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Product details

Overview

MCP73833T-BZI/UN from Microchip Technology is a standalone linear Li-ion/Li-polymer battery charge management controller in a 10-lead DFN-3×3 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 - designed for USB-powered portable devices requiring compact, low-component-count battery charging.

For engineers reviewing the MCP73833T-BZI/UN datasheet, MCP73833T-BZI/UN pinout, MCP73833T-BZI/UN application, or MCP73833T-BZI/UN equivalent, key selection criteria include its factory-set 4.20 V regulation, PROG-resistor-based current programming (1 kΩ → 1 A), dual status outputs (STAT1/STAT2), thermistor-based temperature monitoring, and PG output for input power validation.

Technical Context

The MCP73833T-BZI/UN implements a fully integrated linear charging architecture with an internal P-channel MOSFET pass transistor (R_DS(on) = 300 mΩ), precision voltage reference (1.21 V), and ratiometric current sensing. Its charge algorithm includes preconditioning (trickle charge at 10%–100% of I_REG), fast-charge CC mode, CV regulation, automatic termination (at 5% I_REG), and automatic recharge (at 94% V_REG).

Thermal regulation dynamically reduces charge current above ~105°C to prevent overheating, while die-level thermal shutdown activates at 150°C (10°C hysteresis). The device supports system test (LDO) mode via THERM pin override and enters automatic power-down when V_DD falls within 50 mV of V_BAT.

Key Specifications

Parameter	Value and Actual Design Meaning
Voltage Regulation	4.20 V ±0.75% - factory-trimmed for standard Li-ion cells; ensures safe full-charge termination without overvoltage stress.
Max Charge Current	1000 mA - set by 1.0 kΩ PROG resistor; enables full-rate charging of 1000–2000 mAh batteries in under 2 hours.
Precondition Threshold	66.5% V_REG - triggers trickle charge below ~2.8 V to safely recover deeply depleted cells before fast charge.
Charge Termination Ratio	5% I_REG - ends CV phase when current drops to 50 mA (at 1 A setting); prevents overcharge and extends cycle life.
Thermal Shutdown	150°C ±10°C - halts charging immediately upon die overtemperature; resumes only after 140°C cooldown.
UVLO Threshold	3.55 V (typical) with 100 mV hysteresis - prevents operation below safe USB VBUS minimum; avoids brownout-induced instability.
Supply Ripple Rejection	58 dB (10 Hz–1 kHz) - suppresses input noise from noisy adapters or shared USB rails to maintain stable battery voltage regulation.

Pinout & Package

Package: 10-lead DFN (3 mm × 3 mm, exposed thermal pad EP connected to VSS). Pin count and function match MSOP-10 but with superior thermal performance (θ_JA = 41°C/W vs. 113°C/W).

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pins 1,2)	Input supply rail	Dual-input configuration improves current handling and reduces trace inductance; requires ≥1 µF bypass to VSS.
STAT1 / STAT2 (Pins 3,4)	Open-drain status indicators	Drive LEDs directly (sink up to 25 mA) or interface to MCU GPIO; encode charge state (e.g., STAT1=LOW + STAT2=Hi-Z = charging).
VSS (Pin 5)	Ground reference	Common return for battery negative, input supply, and EP; must be low-impedance to minimize sensing error.
PROG (Pin 6)	Current programming & enable	Resistor-to-VSS sets I_REG; floating disables charger and limits reverse discharge to <2 µA.
PG (Pin 7)	Power Good indicator	Pseudo-open-drain output pulled to VDD; LOW indicates valid input > UVLO threshold and V_DD > V_BAT.
THERM (Pin 8)	NTC thermistor bias & sense	50 µA current source drives 10 kΩ NTC; compares voltage to 1.23 V / 0.25 V thresholds for temperature fault detection.
VBAT (Pins 9,10)	Battery output node	Drain of internal P-MOSFET; connects 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 PCB ground plane for thermal dissipation and EMI reduction.

Key Features

Feature	Design Value
Integrated pass transistor	Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained USB chargers.
Programmable 4.20 V regulation	Factory-trimmed ±0.75% accuracy ensures compliance with JEITA and IEC 62133 for Li-ion cell safety.
Thermal regulation with foldback	Automatically scales charge current above 105°C to maintain safe junction temperature without external thermal sensors.
Two independent status outputs	STAT1 and STAT2 provide unambiguous state encoding (e.g., charge progress, completion, fault) without microcontroller polling.
Reverse discharge protection	Blocks battery-to-input leakage (<2 µA) when V_DD is absent, preserving battery charge during host sleep or disconnect.

Applications

USB-Powered Portable Devices	Li-ion Battery Backup Systems
Use Scenario: Charging single-cell Li-ion batteries from 5 V USB ports in smartphones, Bluetooth headsets, and digital cameras. IC Role / Device Role / Timing Role: Standalone linear charge controller managing CC/CV profile, termination, and thermal safety without host intervention. Use Value: Enables compact, cost-effective USB-compliant charging with no firmware or external timing components required.	Use Scenario: Providing seamless backup power to real-time clocks, SRAM, or microcontrollers during main power loss. IC Role / Device Role / Timing Role: Maintains battery float charge and monitors cell health via THERM; recharges automatically when AC power returns. Use Value: Ensures >10-year RTC backup reliability with zero maintenance and guaranteed end-of-charge cutoff.
Wearable Health Monitors	Industrial Handheld Terminals
Use Scenario: Powering compact wearable sensors (ECG, SpO₂) with small-form-factor 300–500 mAh Li-polymer cells. IC Role / Device Role / Timing Role: Delivers precise 4.20 V regulation and low quiescent current (150 µA in charge mode) to maximize runtime between charges. Use Value: Extends wearable battery life by minimizing regulation error and eliminating unnecessary system wakeups.	Use Scenario: Charging ruggedized handheld terminals used in warehouse logistics or field service with frequent hot-swap battery use. IC Role / Device Role / Timing Role: Provides robust preconditioning (66.5% V_REG) and automatic recharge (94% V_REG) to handle partial discharges and intermittent docking. Use Value: Eliminates manual battery conditioning and guarantees consistent charge readiness across thousands of docking cycles.

USB-Powered Portable Devices

Li-ion Battery Backup Systems

Use Scenario: Charging single-cell Li-ion batteries from 5 V USB ports in smartphones, Bluetooth headsets, and digital cameras.

IC Role / Device Role / Timing Role: Standalone linear charge controller managing CC/CV profile, termination, and thermal safety without host intervention.

Use Value: Enables compact, cost-effective USB-compliant charging with no firmware or external timing components required.

Use Scenario: Providing seamless backup power to real-time clocks, SRAM, or microcontrollers during main power loss.

IC Role / Device Role / Timing Role: Maintains battery float charge and monitors cell health via THERM; recharges automatically when AC power returns.

Use Value: Ensures >10-year RTC backup reliability with zero maintenance and guaranteed end-of-charge cutoff.

Wearable Health Monitors

Industrial Handheld Terminals

Use Scenario: Powering compact wearable sensors (ECG, SpO₂) with small-form-factor 300–500 mAh Li-polymer cells.

IC Role / Device Role / Timing Role: Delivers precise 4.20 V regulation and low quiescent current (150 µA in charge mode) to maximize runtime between charges.

Use Value: Extends wearable battery life by minimizing regulation error and eliminating unnecessary system wakeups.

Use Scenario: Charging ruggedized handheld terminals used in warehouse logistics or field service with frequent hot-swap battery use.

IC Role / Device Role / Timing Role: Provides robust preconditioning (66.5% V_REG) and automatic recharge (94% V_REG) to handle partial discharges and intermittent docking.

Use Value: Eliminates manual battery conditioning and guarantees consistent charge readiness across thousands of docking cycles.

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	4.2 V ±1% regulation; 1.5 A max current; integrated LDO; no PG output; different pinout (16-pin QFN).	Supports higher current and system power path management; lacks dedicated power-good signaling for USB host coordination.	Select for systems needing >1 A charge rate or integrated system power rail; verify PCB layout compatibility due to non-pin-compatible footprint.
TP4056	4.2 V ±1.5% regulation; 1 A max; no thermistor input; no preconditioning; no PG/STAT outputs; SOT-23-5 package.	Ultra-low-cost solution for basic charging only; unsuitable for temperature-critical or USB enumeration-aware designs.	Select only for cost-sensitive consumer electronics where thermal monitoring and status feedback are omitted; not recommended for medical or industrial use.

Compared with BQ24075RGTR and TP4056, the MCP73833T-BZI/UN offers tighter voltage regulation (±0.75%), built-in PG signaling for USB host awareness, and comprehensive thermal/fault protection - making it optimal for certified portable devices requiring robust, standards-compliant charging control.

Availability

MCP73833T-BZI/UN is available at Aetrix Electronics and suitable for USB-powered portable devices, Li-ion battery backup systems, wearable health monitors, and industrial handheld terminals requiring stable component supply and long-term production continuity.

Supply support for MCP73833T-BZI/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and interface ICs with emphasis on embedded control and power management.

The MCP73833/4 product line was designed specifically for space-constrained, cost-sensitive Li-ion/Li-polymer charging applications - delivering full-featured linear charge control in minimal footprint packages without requiring external firmware or complex support circuitry.

FAQ

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

The MCP73833T-BZI/UN has a factory-set constant-voltage regulation of 4.20 V with ±0.75% tolerance, optimized for standard single-cell Li-ion and Li-polymer batteries. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It ensures safe, JEITA-compliant full-charge termination without risk of overvoltage stress on the cell.

How is charge current programmed on MCP73833T-BZI/UN?

Charge current on the MCP73833T-BZI/UN is set using a single resistor (R_PROG) from the PROG pin to VSS. For example, a 1.0 kΩ resistor yields 1000 mA nominal current (IREG = 1000 V / R_PROG). The device supports R_PROG values from 1 kΩ to 20 kΩ, enabling programmable currents from 50 mA to 1000 mA with ratiometric preconditioning and termination thresholds.

Does MCP73833T-BZI/UN support battery temperature monitoring?

Yes, the MCP73833T-BZI/UN includes a dedicated THERM pin with a 50 µA internal current source for biasing standard 10 kΩ NTC thermistors. It compares the resulting voltage against factory-set thresholds (1.23 V upper, 0.25 V lower) and suspends charging if out-of-range - providing critical thermal safety for MCP73833T-BZI/UN-based battery systems.

What is the function of the PG pin on MCP73833T-BZI/UN?

The PG (Power Good) pin on MCP73833T-BZI/UN is a pseudo-open-drain output that goes LOW when V_DD exceeds the UVLO threshold (≥3.55 V) and remains above the battery voltage (V_DD > V_BAT). It enables host systems to validate input power presence and integrity - a key feature for USB host coordination and system power sequencing in MCP73833T-BZI/UN implementations.

Can MCP73833T-BZI/UN operate without a battery connected?

Yes, the MCP73833T-BZI/UN supports System Test (LDO) mode: driving the THERM pin above (V_DD − 100 mV) with no battery connected configures it as a low-dropout linear regulator. In this mode, V_BAT regulates to the same 4.20 V setpoint with current limited by the PROG resistor - allowing MCP73833T-BZI/UN to power downstream circuits during development or battery-less operation.

MCP73833T-BZI/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-BZI/UN FAQ

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

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

The price and inventory of MCP73833T-BZI/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-BZI/UN is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your MCP73833T-BZI/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-BZI/UN?

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

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

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

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

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

Return procedure for MCP73833T-BZI/UN:

1.Submit a request within 90 days.

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

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