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

Microchip Technology MCP73833-B6I/UN

Name: MCP73833-B6I/UN
Brand: Microchip Technology
SKU: MCP73833-B6I/UN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73833-B6I/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

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

Datasheet:: MCP73833-B6I/UN.pdf

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

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Product details

Overview

MCP73833-B6I/UN from Microchip Technology is a standalone linear Li-ion/Li-polymer battery charge management controller in MSOP-10 package, featuring 4.20 V ±0.75% constant-voltage regulation, programmable up to 1 A fast-charge current via external PROG resistor, integrated P-channel MOSFET pass transistor with 300 mΩ R_DS(on), and thermal regulation for safe operation in portable USB-powered devices.

For engineers reviewing the MCP73833-B6I/UN datasheet, MCP73833-B6I/UN pinout, MCP73833-B6I/UN application, or MCP73833-B6I/UN equivalent, key selection criteria include its factory-set 4.20 V regulation voltage, UVLO thresholds (3.4–3.7 V start / 3.3–3.6 V stop), preconditioning and termination current ratios, thermistor-based temperature monitoring with 1.23 V / 0.25 V thresholds, and PG output behavior tied to input supply status.

Technical Context

The MCP73833-B6I/UN implements a three-phase linear charging algorithm-preconditioning (trickle), constant-current fast charge, and constant-voltage regulation-with automatic end-of-charge detection based on I_TERM/I_REG ratio and safety timer. It integrates all critical analog blocks: reference generator (1.21 V), current-sense amplifier (G = 0.001), thermal regulation circuitry, and dual comparators for VBAT and THERM monitoring.

Its digital logic manages state transitions across six operational modes (Shutdown, Standby, System Test, Preconditioning, Fast Charge, Constant Voltage, Charge Complete, Recharge), with STAT1/STAT2 open-drain outputs and PG pseudo-open-drain output providing real-time status feedback. The device supports LDO mode when THERM > (VDD − 100 mV) and no battery is connected.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REG	4.20 V ±0.75% - Factory-trimmed regulation voltage for single-cell Li-ion batteries; ensures safe full-charge termination without overvoltage stress.
Max Fast Charge Current	1000 mA - Programmable via 1.0 kΩ PROG-to-VSS resistor; enables rapid charging of 1000–2000 mAh cells in space-constrained USB applications.
R_DS(on)	300 mΩ - On-resistance of internal P-MOSFET pass transistor; limits power dissipation to ≤300 mW at 1 A, supporting thermal regulation.
UVLO Thresholds	V_START = 3.55 V (typ), V_STOP = 3.45 V (typ) - Hysteresis prevents oscillation during brown-out; ensures reliable startup from USB 5 V or 3.3 V auxiliary rails.
THERM Bias Current	50 µA - Precision current source for 10 kΩ NTC thermistors; enables accurate battery temperature monitoring with ±2°C resolution over −40°C to +85°C.
Thermal Shutdown	150°C (T_SD) with 10°C hysteresis - Secondary safety cutoff independent of thermal regulation; protects IC and battery under sustained overload or poor PCB heatsinking.
Supply Current (Standby)	50–100 µA - Ultra-low quiescent draw when PROG is floating or battery absent; extends host system battery life during idle periods.

Pinout & Package

Package: MSOP-10 (3 mm × 3 mm, 0.5 mm pitch), with exposed thermal pad (EP) internally connected to VSS. Requires soldering EP to ground plane for optimal thermal performance (θ_JA = 113°C/W).

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pins 1,2)	Battery management input supply	Dual-input configuration accepts 3.75–6 V; bypassed with ≥1 µF ceramic capacitor; triggers UVLO shutdown if <3.4 V.
STAT1 / STAT2 (Pins 3,4)	Open-drain charge status outputs	Drive LEDs or microcontroller GPIOs; STAT1 = LOW during active charge, STAT2 = LOW at EOC; both Hi-Z in shutdown/standby.
VSS (Pin 5)	0 V reference	Common return for battery negative, input supply, PROG resistor, and EP; must be low-impedance ground path.
PROG (Pin 6)	Current regulation set & enable	Resistor to VSS sets I_REG; floating disables charger and reduces reverse discharge leakage to <2 µA.
PG (Pin 7)	Power good indicator	Pseudo-open-drain output; sinks current only; low when VDD > UVLO threshold and VDD > VBAT; must pull up to VDD only.
THERM (Pin 8)	Thermistor input	50 µA bias current source; compares voltage against 1.23 V / 0.25 V thresholds; fault halts charging immediately.
VBAT (Pins 9,10)	Battery charge control output	Drain of internal P-MOSFET; connects to battery positive; requires ≥1 µF (≤250 mA) or ≥4.7 µF (≥250 mA) ceramic bypass.
EP (Pin 11)	Exposed thermal pad	Internally tied to VSS; mandatory connection to PCB ground plane for thermal regulation and reliability at full 1 A load.

Key Features

Feature	Design Value
Integrated P-MOSFET pass transistor	Eliminates external high-side switch; reduces BOM count and layout area while maintaining 300 mΩ conduction loss at 1 A.
Programmable preconditioning & termination	Precondition current ratio (7.5–100%) and termination threshold (3.75–25% of I_REG) allow safe recovery of deeply discharged cells and precise EOC detection.
Factory-set 4.20 V regulation	Guarantees compatibility with standard single-cell Li-ion chemistry without external feedback resistors or trimming components.
Thermal regulation with die-temp sensing	Automatically reduces charge current above ~105°C to prevent thermal runaway; maintains reliability in sealed enclosures or high-ambient environments.
System Test (LDO) mode	Enables VBAT output as regulated 4.20 V LDO (current-limited to I_REG) when THERM > VDD−100 mV and no battery present-useful for board-level functional testing.

Applications

USB-Powered Portable Devices	Smart Wearables
Use Scenario: Charging compact electronics (e.g., Bluetooth headsets, wireless earbuds) directly from USB 5 V ports with strict inrush and thermal constraints. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, UVLO, and thermal foldback without MCU intervention. Use Value: Enables certified USB compliance (≤100 mA pre-enumeration, ≤500 mA post-enumeration) using single PROG resistor and no firmware.	Use Scenario: Powering and charging small-form-factor wearables (e.g., fitness trackers) where PCB space is limited to <100 mm² and battery capacity is 100–300 mAh. IC Role / Device Role / Timing Role: Dual-role power manager-charging battery during docked operation and supplying regulated 4.20 V to system during battery-only operation via LDO mode. Use Value: Reduces component count by integrating pass FET, current sense, and temperature monitoring-eliminating 6+ discrete parts.
Medical Monitoring Sensors	Industrial Handheld Terminals
Use Scenario: Rechargeable battery packs in Class II medical devices (e.g., pulse oximeters, glucose meters) requiring fail-safe thermal monitoring and low leakage in standby. IC Role / Device Role / Timing Role: Safety-critical battery supervisor enforcing NTC-based temperature window (0°C–45°C) and automatic recharge at 94% V_REG. Use Value: Meets IEC 62368-1 thermal hazard requirements via dual-threshold THERM comparator and 150°C hardware shutdown.	Use Scenario: Ruggedized handheld terminals used in warehouses or field service with wide ambient temperature range (−20°C to +60°C) and frequent partial recharges. IC Role / Device Role / Timing Role: Robust linear charger supporting automatic recharge at 94% V_REG, preconditioning for cold-soaked batteries, and UVLO hysteresis for unstable 5 V adapters. Use Value: Extends usable battery life by 12–18% versus fixed-threshold chargers through adaptive recharge and deep-discharge recovery.

USB-Powered Portable Devices

Smart Wearables

Use Scenario: Charging compact electronics (e.g., Bluetooth headsets, wireless earbuds) directly from USB 5 V ports with strict inrush and thermal constraints.

IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, UVLO, and thermal foldback without MCU intervention.

Use Value: Enables certified USB compliance (≤100 mA pre-enumeration, ≤500 mA post-enumeration) using single PROG resistor and no firmware.

Use Scenario: Powering and charging small-form-factor wearables (e.g., fitness trackers) where PCB space is limited to <100 mm² and battery capacity is 100–300 mAh.

IC Role / Device Role / Timing Role: Dual-role power manager-charging battery during docked operation and supplying regulated 4.20 V to system during battery-only operation via LDO mode.

Use Value: Reduces component count by integrating pass FET, current sense, and temperature monitoring-eliminating 6+ discrete parts.

Medical Monitoring Sensors

Industrial Handheld Terminals

Use Scenario: Rechargeable battery packs in Class II medical devices (e.g., pulse oximeters, glucose meters) requiring fail-safe thermal monitoring and low leakage in standby.

IC Role / Device Role / Timing Role: Safety-critical battery supervisor enforcing NTC-based temperature window (0°C–45°C) and automatic recharge at 94% V_REG.

Use Value: Meets IEC 62368-1 thermal hazard requirements via dual-threshold THERM comparator and 150°C hardware shutdown.

Use Scenario: Ruggedized handheld terminals used in warehouses or field service with wide ambient temperature range (−20°C to +60°C) and frequent partial recharges.

IC Role / Device Role / Timing Role: Robust linear charger supporting automatic recharge at 94% V_REG, preconditioning for cold-soaked batteries, and UVLO hysteresis for unstable 5 V adapters.

Use Value: Extends usable battery life by 12–18% versus fixed-threshold chargers through adaptive recharge and deep-discharge recovery.

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 programmable V_REG options; 1.5 A max charge current; integrated LDO output (3.3 V); no THERM input.	Lacks battery temperature monitoring; suitable for cost-sensitive consumer devices without thermal safety requirements.	Select BQ24075RGTR only if thermal qualification is unnecessary and 3.3 V LDO output is required for system rail generation.
MCP73831T-2DCI/OT	Single-pin PROG interface; no PG output; DFN-8 package; same 4.20 V V_REG but no MSOP-10 option; lower thermal resistance (θ_JA = 140°C/W vs. 113°C/W).	Smaller footprint but reduced thermal margin; lacks PG status signal needed for host power-good indication.	Choose MCP73831T-2DCI/OT for ultra-compact designs where PG signal is unused and thermal load is <500 mA.

Compared with BQ24075RGTR and MCP73831T-2DCI/OT, the MCP73833-B6I/UN uniquely combines factory-trimmed 4.20 V regulation, MSOP-10 thermal performance (θ_JA = 113°C/W), PG output for host power validation, and full thermistor interface-making it optimal for USB-powered medical and industrial devices requiring safety certification and robust thermal management.

Availability

MCP73833-B6I/UN is available at Aetrix Electronics and suitable for USB chargers, smart wearables, medical sensors, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MCP73833-B6I/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, communications, and consumer markets with high-reliability silicon and development tools.

The MCP73833/4 product line delivers highly integrated, space-efficient linear battery chargers optimized for portable USB-powered devices-designed to reduce external component count while meeting stringent safety, thermal, and regulatory requirements.

FAQ

What is the factory-set regulation voltage for MCP73833-B6I/UN?

The MCP73833-B6I/UN has a factory-trimmed constant-voltage regulation of 4.20 V ±0.75%, specifically calibrated for standard single-cell Li-ion and Li-polymer batteries. This value is fixed and cannot be adjusted externally-it is one of four factory options (4.20 V, 4.35 V, 4.40 V, 4.50 V) selected at wafer sort, and the "-B6" suffix denotes the 4.20 V variant. The MCP73833-B6I/UN does not require external feedback resistors to achieve this accuracy.

How does the PG output behave on MCP73833-B6I/UN?

The PG (Power Good) output on MCP73833-B6I/UN is a pseudo-open-drain pin that sinks current only and must be pulled up to VDD-not to a separate rail. It goes low when VDD exceeds the UVLO start threshold (≥3.4 V) and remains greater than VBAT; it floats (Hi-Z) during shutdown (VDD < VSTOP) or when VDD < VBAT. This behavior allows host systems to verify valid input power presence before enabling downstream loads. The MCP73833-B6I/UN implements this PG function, unlike the MCP73834 which substitutes TE (Timer Enable) on Pin 7.

Can MCP73833-B6I/UN operate without a thermistor?

Yes, the MCP73833-B6I/UN can operate without a thermistor. If temperature monitoring is not required, connect a 10 kΩ resistor from THERM to VSS to satisfy bias requirements and disable thermal fault detection. In this configuration, the MCP73833-B6I/UN performs full CC/CV charging with preconditioning, termination, and automatic recharge-but omits thermal qualification. All other functions-including STAT1/STAT2 status, PG output, and thermal regulation-remain fully operational.

What is the maximum charge current achievable with MCP73833-B6I/UN?

The MCP73833-B6I/UN supports a maximum fast-charge current of 1000 mA, achieved by connecting a 1.0 kΩ resistor between PROG and VSS. Its current regulation tolerance is ±10% (900–1100 mA) at +25°C, with extended range (±20%) over −5°C to +55°C. At higher currents, thermal regulation begins reducing I_REG above ~105°C junction temperature to maintain reliability-ensuring safe operation even in poorly ventilated enclosures.

Does MCP73833-B6I/UN support automatic recharge, and at what threshold?

Yes, the MCP73833-B6I/UN supports automatic recharge with a factory-set voltage threshold of 94.0% of V_REG (i.e., 3.948 V for the 4.20 V variant). When VBAT drops below this level in Charge Complete mode, the device initiates a new preconditioning → fast-charge → CV cycle. This threshold is fixed and not user-adjustable; however, the MCP73833-B6I/UN also offers a 96.5% option in other variants. Recharge occurs only after full termination-not during transient load dips-due to built-in filtering.

MCP73833-B6I/UN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

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

MCP73833-B6I/UN FAQ

1.How can I place an order for MCP73833-B6I/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73833-B6I/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 MCP73833-B6I/UN reliable?

The price and inventory of MCP73833-B6I/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73833-B6I/UN is usually 5 days.

3.What payment methods are accepted for MCP73833-B6I/UN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73833-B6I/UN transactions.

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4.How is shipping managed for MCP73833-B6I/UN?

MCP73833-B6I/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73833-B6I/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 MCP73833-B6I/UN?

For technical support, including MCP73833-B6I/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73833-B6I/UN requirements.

6.How does Aetrix verify that MCP73833-B6I/UN is sourced from the original manufacturer or authorized distributors?

All MCP73833-B6I/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 MCP73833-B6I/UN meets industry standards.

7.What is the process for return or replacement of MCP73833-B6I/UN?

All MCP73833-B6I/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73833-B6I/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 MCP73833-B6I/UN part is unused and in its original packaging.

Return procedure for MCP73833-B6I/UN:

1.Submit a request within 90 days.

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

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