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

Microchip Technology MCP73123T-22SI/MF

Name: MCP73123T-22SI/MF
Brand: Microchip Technology
SKU: MCP73123T-22SI/MF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP73123T-22SI/MF

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 10-VFDFN Exposed Pad

Datasheet:: MCP73123T-22SI/MF.pdf

Description:: IC BAT CNTRL IRON PHOS 1C 10DFN

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Product details

Overview

MCP73123T-22SI/MF from Microchip Technology is a single-cell LiFePO₄ linear battery charge management controller with integrated pass transistor, input overvoltage protection (6.5 V), and factory-preset 3.6 V regulation. It delivers 130–1100 mA programmable fast charge current, supports preconditioning at 2 V, and operates across –40°C to +85°C in space-constrained power tools and backup energy storage systems.

For engineers reviewing the MCP73123T-22SI/MF datasheet, MCP73123T-22SI/MF pinout, MCP73123T-22SI/MF application, or MCP73123T-22SI/MF equivalent, key selection criteria include its ±0.5% voltage accuracy over –5°C to +55°C, thermal regulation with 150°C shutdown, DFN-10 (3 mm × 3 mm) package with exposed pad, and resistor-programmable end-of-charge current ratio (10%) and elapsed timer (6 hr).

Technical Context

The MCP73123T-22SI/MF implements a three-phase LiFePO₄-optimized charge algorithm: preconditioning (2 V threshold, 10% I_REG), constant-current fast charge (programmed via PROG resistor), and constant-voltage regulation (3.6 V ±0.5%). Its internal P-channel MOSFET has 350 mΩ R_DS(on) at 105°C, enabling efficient linear charging without external FETs.

Control logic integrates UVLO (4.15 V start), OVP (6.5 V), automatic recharge (95% V_REG), and safety timers (precondition: 32 min; elapsed: 6 hr). The STAT pin provides open-drain status signaling (Type 1: on/off), while thermal regulation dynamically reduces I_REG above 110°C to maintain reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Voltage	3.6 V ±0.5% over –5°C to +55°C - ensures precise LiFePO₄ cell termination without overvoltage stress
Input OVP Threshold	6.4 V to 6.6 V - protects against AC adapter spikes up to 18 V absolute max input
Fast Charge Current Range	130 mA to 1100 mA - set by single PROG-to-VSS resistor (1 kΩ to 10 kΩ), enabling flexible design scaling
Preconditioning Threshold	2.0 V ±0.1 V - safely revives deeply depleted LiFePO₄ cells before full-rate charging
End-of-Charge Current Ratio	10% of I_REG - terminates charge when current drops below this threshold, preventing overcharge
Elapsed Safety Timer	6 hr - halts charging if CV phase exceeds duration, adding critical fault coverage
Operating Temperature	–40°C to +85°C ambient - validated for industrial-grade power tool and energy storage environments

Pinout & Package

Package: DFN-10 (3 mm × 3 mm) with exposed thermal pad (EP); EP must be soldered to PCB ground plane for thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pins 1, 2)	Battery management input supply	Accepts 4.2–6.5 V input; 18 V absolute max; bypass with ≥1 µF capacitor to VSS
VBAT (Pins 3, 4)	Battery charge control output	Drain of internal P-MOSFET; connects directly to LiFePO₄ (+) terminal; requires ≥1 µF bypass
NC (Pins 5, 6)	No connect	Not internally bonded; must remain unconnected per datasheet
STAT (Pin 7)	Status output	Open-drain indicator (Type 1: on/off); sinks up to 20 mA; drives LED or microcontroller input
VSS (Pins 8, 9)	Battery reference ground	Common return for VDD, VBAT, PROG, and EP; must tie to battery (–) and PCB ground plane
PROG (Pin 10)	Charge current regulation & enable	Resistor sets I_REG; floating (>200 kΩ) disables charger; also serves as enable control
EP (Pin 11)	Exposed thermal pad	Must be soldered to PCB copper area with multiple vias; recommended connection to VSS for thermal and EMI control

Key Features

Feature	Design Value
Integrated pass transistor	Eliminates need for external MOSFET and gate driver, reducing BOM count and PCB footprint
Factory-preset 3.6 V regulation	±0.5% accuracy over –5°C to +55°C enables drop-in LiFePO₄ charging without trimming resistors
Input overvoltage protection	6.5 V OVP with 150 mV hysteresis prevents damage from low-cost AC adapters or plug/unplug transients
Thermal regulation + shutdown	Dynamically scales I_REG above 110°C and suspends charge at 150°C, ensuring safe operation under high ambient or load conditions
Preconditioning & safety timers	2 V precondition threshold and 32-minute timer protect deeply discharged cells; 6-hour elapsed timer adds fail-safe coverage

Applications

Power Tools	Backup Energy Storage
Use Scenario: Cordless drill/driver with 1-cell LiFePO₄ pack (3.2–3.6 V nominal) requiring rapid, safe charging from low-cost wall adapters. IC Role / Device Role / Timing Role: Linear charge controller managing CC/CV profile, OVP, thermal foldback, and end-of-charge detection. Use Value: Enables compact, cost-effective charger design with no external FET or sense resistor-reducing bill-of-materials and layout complexity.	Use Scenario: Uninterruptible lighting or sensor node using 1-cell LiFePO₄ for off-grid backup, charged intermittently from solar or USB sources. IC Role / Device Role / Timing Role: Standalone charge manager providing preconditioning, automatic recharge at 95% V_REG, and UVLO/OVP protection. Use Value: Extends battery cycle life via precise 3.6 V regulation and prevents deep discharge damage with 2 V preconditioning.
Toys	Low-Cost LiFePO₄ Chargers
Use Scenario: RC vehicle or educational robot with replaceable 1-cell LiFePO₄ battery, charged via micro-USB or barrel jack. IC Role / Device Role / Timing Role: Integrated charge controller delivering 130–1100 mA fast charge, STAT-driven LED status, and thermal safety. Use Value: Simplifies compliance-critical safety design with built-in battery short protection (1.45 V threshold) and automatic shutdown modes.	Use Scenario: OEM charger module for consumer electronics where size, cost, and reliability are prioritized over programmability. IC Role / Device Role / Timing Role: Fixed-function LiFePO₄ charger with factory-set 3.6 V, 10% I_TERM, 6 hr timer, and Type 1 STAT output. Use Value: Reduces time-to-market with zero configuration required-no firmware, no external components beyond PROG resistor and bypass caps.

Power Tools

Backup Energy Storage

Use Scenario: Cordless drill/driver with 1-cell LiFePO₄ pack (3.2–3.6 V nominal) requiring rapid, safe charging from low-cost wall adapters.

IC Role / Device Role / Timing Role: Linear charge controller managing CC/CV profile, OVP, thermal foldback, and end-of-charge detection.

Use Value: Enables compact, cost-effective charger design with no external FET or sense resistor-reducing bill-of-materials and layout complexity.

Use Scenario: Uninterruptible lighting or sensor node using 1-cell LiFePO₄ for off-grid backup, charged intermittently from solar or USB sources.

IC Role / Device Role / Timing Role: Standalone charge manager providing preconditioning, automatic recharge at 95% V_REG, and UVLO/OVP protection.

Use Value: Extends battery cycle life via precise 3.6 V regulation and prevents deep discharge damage with 2 V preconditioning.

Toys

Low-Cost LiFePO₄ Chargers

Use Scenario: RC vehicle or educational robot with replaceable 1-cell LiFePO₄ battery, charged via micro-USB or barrel jack.

IC Role / Device Role / Timing Role: Integrated charge controller delivering 130–1100 mA fast charge, STAT-driven LED status, and thermal safety.

Use Value: Simplifies compliance-critical safety design with built-in battery short protection (1.45 V threshold) and automatic shutdown modes.

Use Scenario: OEM charger module for consumer electronics where size, cost, and reliability are prioritized over programmability.

IC Role / Device Role / Timing Role: Fixed-function LiFePO₄ charger with factory-set 3.6 V, 10% I_TERM, 6 hr timer, and Type 1 STAT output.

Use Value: Reduces time-to-market with zero configuration required-no firmware, no external components beyond PROG resistor and bypass caps.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LiFePO₄ charge management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP73123-22S/MF	Identical electrical specs and pinout; differs only in tape-and-reel packaging (S = standard reel, T = custom reel)	Same functional use in production assembly; no design change required	Select MCP73123T-22SI/MF for custom volume reels; MCP73123-22S/MF for standard distribution quantities
MCP73123-22A/MF	Same package and core functionality, but automatic recharge disabled (0% VRTH/VREG)	Suitable where battery removal/reinsertion or manual reset is preferred over autonomous top-up	Choose MCP73123-22A/MF for applications requiring explicit user-initiated recharge cycles

Compared with MCP73123-22S/MF, the MCP73123T-22SI/MF offers identical performance in a custom reel format optimized for high-volume SMT lines; versus MCP73123-22A/MF, it enables automatic recharge at 95% V_REG, improving runtime autonomy in always-on backup systems.

Availability

MCP73123T-22SI/MF is available at Aetrix Electronics and suitable for power tools, backup energy storage solutions, and toys requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and production lots.

Supply support for MCP73123T-22SI/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 Inc. is a leading provider of microcontrollers, analog, and interface ICs, serving industrial, automotive, and consumer markets with high-reliability semiconductor solutions.

The MCP73123 product line delivers highly integrated, cost-optimized linear charge controllers specifically engineered for LiFePO₄ battery chemistry-prioritizing safety, precision, and minimal external component count in space-constrained applications.

FAQ

What is the factory-set charge voltage and tolerance for MCP73123T-22SI/MF?

The MCP73123T-22SI/MF is factory preset to 3.6 V regulation with ±0.5% tolerance over –5°C to +55°C ambient. This value is laser-trimmed during production and does not require external resistive feedback. The MCP73123T-22SI/MF achieves this accuracy without calibration, making it ideal for fixed-voltage LiFePO₄ applications where board space and BOM simplicity are critical.

How is fast charge current programmed on MCP73123T-22SI/MF?

Fast charge current on the MCP73123T-22SI/MF is set by a single resistor (R_PROG) connected between the PROG pin and VSS. Using Equation 5-1 (I_REG = 1104 / R_PROG), values from 130 mA (10 kΩ) to 1100 mA (1 kΩ) are supported. The MCP73123T-22SI/MF datasheet provides an E96/E24 resistor lookup table to simplify selection and ensure stable operation across temperature.

Does MCP73123T-22SI/MF support automatic recharge, and at what threshold?

Yes, the MCP73123T-22SI/MF supports automatic recharge at 95% of its regulated voltage (i.e., 3.42 V for a 3.6 V system). When battery voltage drops below this threshold in Charge Complete mode, the device initiates a new charge cycle. This behavior is factory-configured and cannot be altered externally-confirming that MCP73123T-22SI/MF delivers autonomous top-up capability without host intervention.

What thermal protection features does MCP73123T-22SI/MF include?

The MCP73123T-22SI/MF incorporates dual thermal safeguards: (1) dynamic thermal regulation that progressively reduces fast charge current above ~110°C die temperature, and (2) hard thermal shutdown at 150°C with 10°C hysteresis. Both functions are fully internal-no external sensors or circuitry required. These protections ensure reliable operation in sealed enclosures like power tools and prevent thermal runaway during high-ambient or high-load conditions.

What is the function of the STAT pin on MCP73123T-22SI/MF, and what output type is implemented?

The STAT pin on MCP73123T-22SI/MF is an open-drain status indicator configured as Type 1 (on/off), meaning it actively pulls low during active charging phases (precondition, fast charge, constant voltage) and goes into high-impedance state at charge completion or fault. It can drive an LED directly with a pull-up resistor or interface to a microcontroller GPIO. The MCP73123T-22SI/MF does not support flashing (Type 2) output-this variant is fixed to on/off signaling per its part number suffix.

MCP73123T-22SI/MF Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Lithium Iron Phosphate

Number of Cells:: 1

Current - Charging:: Constant - Programmable

Programmable Features:: Current, Timer

Fault Protection:: Over Temperature, Over Voltage, Reverse Current

Charge Current - Max:: 1.1A

Battery Pack Voltage:: 3.6V

Voltage - Supply (Max):: 16V

Interface:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-DFN (3x3)

MCP73123T-22SI/MF FAQ

1.How can I place an order for MCP73123T-22SI/MF through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73123T-22SI/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 MCP73123T-22SI/MF reliable?

The price and inventory of MCP73123T-22SI/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73123T-22SI/MF is usually 5 days.

3.What payment methods are accepted for MCP73123T-22SI/MF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73123T-22SI/MF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCP73123T-22SI/MF?

MCP73123T-22SI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73123T-22SI/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 MCP73123T-22SI/MF?

For technical support, including MCP73123T-22SI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73123T-22SI/MF requirements.

6.How does Aetrix verify that MCP73123T-22SI/MF is sourced from the original manufacturer or authorized distributors?

All MCP73123T-22SI/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 MCP73123T-22SI/MF meets industry standards.

7.What is the process for return or replacement of MCP73123T-22SI/MF?

All MCP73123T-22SI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP73123T-22SI/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 MCP73123T-22SI/MF part is unused and in its original packaging.

Return procedure for MCP73123T-22SI/MF:

1.Submit a request within 90 days.

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

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