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Microchip Technology MCP73123-22SI/MF
- Part No.:
- MCP73123-22SI/MF
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP73123-22SI/MF.pdf
- Description:
- IC BAT CNTRL IRON PHOS 1C 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP73123-22SI/MF from Microchip Technology is a fully integrated linear LiFePO₄ battery charge management controller in a 10-lead DFN-3×3 package. It delivers factory-preset 3.6V regulation (±0.5% over –5°C to +55°C), 6.5V input overvoltage protection, and resistor-programmable fast charge current from 130 mA to 1100 mA for single-cell power tool and backup energy storage applications.
For engineers reviewing the MCP73123-22SI/MF datasheet, MCP73123-22SI/MF pinout, MCP73123-22SI/MF application, or MCP73123-22SI/MF equivalent, key selection considerations include its integrated pass transistor (350 mΩ RDS(on)), preconditioning threshold (2.0 V), 32-minute precondition timer, and automatic recharge at 95% VREG - all validated for space-constrained LiFePO₄ charging systems.
Technical Context
The MCP73123-22SI/MF implements a three-phase linear charge algorithm: preconditioning (10% IREG at VBAT < 2.0 V), constant-current fast charge (programmed via PROG–VSS resistor), and constant-voltage regulation (3.6 V). Thermal regulation dynamically reduces IREG above 110°C to maintain reliability without external sensing.
Its control logic integrates UVLO (4.15 V start/4.05 V stop), OVP (6.5 V with 150 mV hysteresis), battery short protection (1.45 V threshold), and dual safety timers - elapse (6 hr) and precondition (32 min) - all factory-configured and non-adjustable for this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 3.6 V ±0.5% over –5°C to +55°C - enables precise single-cell LiFePO₄ charging without external voltage reference. |
| Input OVP Threshold | 6.4 V to 6.6 V - protects against AC adapter spikes up to 18 V absolute max while maintaining operation between UVLO and OVP. |
| Fast Charge Current Range | 130 mA to 1100 mA - set by single external resistor (1 kΩ to 10 kΩ), supporting scalable power delivery for tools and portable devices. |
| Precondition Threshold | 2.0 V (typical) - triggers 10% IREG trickle charge for deeply depleted LiFePO₄ cells before full-rate charging begins. |
| End-of-Charge Termination | 10% IREG - halts charging when average current drops below 10% of programmed fast charge level, preventing overcharge. |
| Thermal Shutdown | 150°C (±10°C hysteresis) - suspends charging during thermal overload, resuming only after die cools by ~10°C. |
| Package | DFN-10 (3 mm × 3 mm) with exposed thermal pad - enables high-power dissipation (θJA = 64°C/W) in ultra-compact layouts. |
Pinout & Package
Package: 10-lead DFN (3 mm × 3 mm) with exposed thermal pad (EP), rated for –40°C to +85°C ambient operation. EP must be soldered to PCB ground plane for thermal performance.
| 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; powers internal circuitry and gate drive; requires ≥1 µF bypass to VSS. |
| VBAT (Pins 3,4) | Battery charge control output | Drain of internal P-MOSFET; connects directly to LiFePO₄ (+) terminal; regulates 3.6 V with ±0.5% accuracy. |
| NC (Pins 5,6) | No connect | Unbonded pins; must remain floating - no routing or connection permitted. |
| STAT (Pin 7) | Status output | Open-drain indicator: low during active charge, high-Z at completion (Type 1 output per datasheet Table 2). |
| VSS (Pins 8,9) | Battery management 0V reference | Common ground return for VDD, VBAT, PROG, and STAT; must tie to battery (–) and PCB ground plane. |
| PROG (Pin 10) | Current regulation & enable | Resistor-to-VSS sets IREG; >200 kΩ impedance disables charger; also serves as enable input. |
| EP (Pin 11) | Exposed thermal pad | Internally connected to VSS; must be soldered to large copper area with multiple vias for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pass transistor | 350 mΩ RDS(on) at 4.5 V VDD, 105°C - eliminates external MOSFET, reducing BOM count and layout area. |
| Factory-preset charge profile | 3.6 V regulation, 6.5 V OVP, 2.0 V precondition threshold, 32-min precondition timer, 6-hr elapse timer, 10% termination, 95% auto-recharge - no configuration required for turnkey LiFePO₄ charging. |
| Input overvoltage protection | 6.5 V OVP with 150 mV hysteresis - blocks damaging transients from low-cost AC adapters without external TVS diodes. |
| Reverse discharge protection | Internal blocking path prevents battery self-discharge through VDD when input is absent - eliminates need for external reverse-blocking diode. |
| Thermal regulation | Continuous current reduction above ~110°C - maintains safe junction temperature without abrupt shutdown, optimizing charge time under thermal stress. |
Applications
| Power Tools | Toys |
|---|---|
Use Scenario: Cordless drill/driver with single-cell LiFePO₄ pack requiring rapid, safe charging from 12 V wall adapter. IC Role / Device Role / Timing Role: Linear charge controller managing precondition, CC/CV stages, OVP, and thermal foldback - replaces discrete FET+op-amp solutions. Use Value: Enables compact, cost-effective charger design with no microcontroller needed; 3.6 V precision avoids LiFePO₄ undercharge or overcharge. | Use Scenario: Remote-controlled toy vehicle using 3.6 V LiFePO₄ battery charged via USB-powered adapter. IC Role / Device Role / Timing Role: Standalone charge manager providing automatic recharge, end-of-charge detection, and status LED drive via STAT pin. Use Value: Eliminates manual charge cutoff; 2.0 V precondition safely revives deeply discharged batteries common in infrequent-use toys. |
| Backup Energy Storage | Low-Cost LiFePO₄ Chargers |
Use Scenario: UPS module for IoT gateway storing energy in 3.6 V LiFePO₄ cell during grid power, recharging when mains returns. IC Role / Device Role / Timing Role: Battery management unit enforcing strict 3.6 V regulation, 95% auto-recharge, and 6-hour safety timer to prevent overcharge during long standby. Use Value: Ensures >2000-cycle life by avoiding voltage excursions; integrated OVP guards against brownout-induced adapter instability. | Use Scenario: Generic LiFePO₄ charger PCB for consumer electronics OEMs needing drop-in, certified-compliant solution. IC Role / Device Role / Timing Role: Fully integrated controller with factory-set parameters - no trimming resistors, no firmware, no calibration required. Use Value: Reduces time-to-market: one BOM item replaces 5–7 discrete components; DFN-10 footprint fits <100 mm² board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LiFePO₄ charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73123-22A/MF | No automatic recharge (0% VRTH/VREG); same 3.6 V, 6.5 V OVP, 2.0 V precondition, 32-min timer, 10% termination. | Suitable where battery remains connected permanently and recharge must be disabled to avoid cycling wear. | Select when system-level logic handles recharge decision or battery is removed post-charge. |
| MCP73223-C2S/MF | 7.2 V regulation, 13 V OVP, 4.0 V precondition threshold - designed for dual-cell LiFePO₄ stacks. | Required for 2S battery configurations; incompatible with single-cell 3.6 V systems due to voltage mismatch. | Choose only for 2-cell packs; not a functional substitute for MCP73123-22SI/MF in 1S designs. |
Compared with MCP73123-22A/MF, the MCP73123-22SI/MF adds automatic recharge at 95% VREG for maintenance charging, while MCP73223-C2S/MF targets fundamentally different 2S topologies - neither offers pin compatibility or direct substitution without schematic and layout changes.
Availability
MCP73123-22SI/MF is available at Aetrix Electronics and suitable for power tools, toys, and backup energy storage solutions requiring stable component supply, long-lifecycle support, and automotive-grade thermal robustness.
Supply support for MCP73123-22SI/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, interface, and power management ICs, serving industrial, automotive, and consumer markets with high-reliability semiconductor solutions.
The MCP73123 product line delivers highly integrated, factory-configured LiFePO₄ charge controllers optimized for cost-sensitive, space-constrained applications where minimal external components and guaranteed safety compliance are critical.
FAQ
What is the factory-set charge voltage for MCP73123-22SI/MF?
The MCP73123-22SI/MF has a factory-preset regulated output voltage of 3.6 V with ±0.5% tolerance across –5°C to +55°C. This value is laser-trimmed and non-adjustable, ensuring accurate single-cell LiFePO₄ charging without external feedback components. The MCP73123-22SI/MF does not support user-programmable voltage settings.
Does MCP73123-22SI/MF support automatic recharge, and at what threshold?
Yes, the MCP73123-22SI/MF supports automatic recharge at 95% of its regulated voltage (i.e., 3.42 V), as confirmed in Table 2 of DS22191E. When battery voltage drops below this threshold in Charge Complete mode, the device initiates a new charge cycle. This behavior distinguishes it from the MCP73123-22A/MF variant, which disables automatic recharge.
What is the maximum fast charge current achievable with MCP73123-22SI/MF?
The MCP73123-22SI/MF supports a fast charge current range of 130 mA to 1100 mA, set by a single resistor from PROG to VSS. At the upper limit, a 1.0 kΩ resistor yields ~1100 mA (per Equation 5-2 in DS22191E). This current is thermally regulated above ~110°C to prevent junction overheating, and the device's 350 mΩ internal RDS(on) limits power dissipation at full load.
How does the preconditioning function operate on MCP73123-22SI/MF?
The MCP73123-22SI/MF enters preconditioning mode when VBAT falls below 2.0 V (factory-set threshold), supplying 10% of the programmed fast charge current to safely recover deeply depleted LiFePO₄ cells. This phase is enforced for up to 32 minutes (factory-timed); if the battery voltage does not rise above 2.0 V within that window, the device signals a timer fault and halts charging until power is cycled.
What package type and thermal characteristics apply to MCP73123-22SI/MF?
The MCP73123-22SI/MF uses a 10-lead DFN package (3 mm × 3 mm) with an exposed thermal pad (EP) that must be soldered to a PCB ground plane. Its thermal resistance is θJA = 64°C/W (4-layer board, natural convection) and θJC = 12°C/W, enabling reliable operation up to +85°C ambient. The EP connection is mandatory for meeting thermal specifications.
MCP73123-22SI/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tube
- 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)
MCP73123-22SI/MF FAQ
1.How can I place an order for MCP73123-22SI/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73123-22SI/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 MCP73123-22SI/MF reliable?
The price and inventory of MCP73123-22SI/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73123-22SI/MF is usually 5 days.
3.What payment methods are accepted for MCP73123-22SI/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73123-22SI/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP73123-22SI/MF?
MCP73123-22SI/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73123-22SI/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 MCP73123-22SI/MF?
For technical support, including MCP73123-22SI/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73123-22SI/MF requirements.
6.How does Aetrix verify that MCP73123-22SI/MF is sourced from the original manufacturer or authorized distributors?
All MCP73123-22SI/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 MCP73123-22SI/MF meets industry standards.
7.What is the process for return or replacement of MCP73123-22SI/MF?
All MCP73123-22SI/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP73123-22SI/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 MCP73123-22SI/MF part is unused and in its original packaging.
Return procedure for MCP73123-22SI/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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