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STMicroelectronics LF25CPT
- Part No.:
- LF25CPT
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LF25CPT.pdf
- Description:
- IC REG LINEAR 2.5V 500MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
LF25CPT from STMicroelectronics is a 2.5 V fixed-output, 500 mA very low dropout (LDO) linear regulator in TO-220FP package with logic-controlled shutdown (TTL-compatible enable), ±2% output voltage accuracy at 25°C, 0.4 V typical dropout at 500 mA, and 50 µA quiescent current in OFF mode-designed for local regulation in battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the LF25CPT datasheet, LF25CPT pinout, LF25CPT application, or LF25CPT equivalent, key selection criteria include its 0.4 V dropout at full load, 50 µA shutdown current, 2.2 µF minimum output capacitance requirement, and TTL-level enable input for system-level power sequencing in space-constrained embedded designs.
Technical Context
The LF25CPT implements a PNP pass transistor architecture enabling ultra-low dropout operation down to 0.2 V at 200 mA and 0.4 V at 500 mA. Its internal current and thermal limiting protect against fault conditions without external components.
It features a dedicated TTL-compatible control input (pin 2) that enables full shutdown with 50 µA quiescent current, while maintaining stable regulation across –40°C to +125°C junction temperature range and supporting input voltages up to 16 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% at 25°C - ensures stable core supply for 2.5 V logic and analog subsystems |
| Max Output Current | 500 mA - supports moderate-power microcontrollers and signal-chain ICs |
| Dropout Voltage | 0.4 V typ. at 500 mA - enables operation from 2.9 V input (e.g., single Li-ion cell post-regulation) |
| Quiescent Current | 50 µA in OFF mode - minimizes standby power in always-on sensor nodes |
| Input Voltage Range | 2.5 V to 16 V - accommodates wide-input industrial supplies and battery stacks |
| Supply Rejection | 82 dB at 120 Hz - suppresses ripple from switching pre-regulators |
| Output Capacitor | 2.2 µF min. (ESR 0.1–10 Ω) - enables compact, low-BOM-cost filtering |
Pinout & Package
LF25CPT is housed in a 5-pin TO-220FP package with heat sink tab (pin 3), featuring vertical mounting capability and improved thermal resistance (RthJC = 5°C/W) versus standard TO-220.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (VI) | Main unregulated DC input connection; must be decoupled with ≥0.1 µF ceramic capacitor |
| 2 | Enable (EN) | TTL-compatible logic input: <0.8 V = OFF (50 µA IQ), >2 V = ON (500 µA IQ) |
| 3 | Ground / Heat Sink | Common reference and primary thermal path; electrically connected to metal tab |
| 4 | Output (VO) | Regulated 2.5 V output; requires ≥2.2 µF output capacitor for stability |
| 5 | Ground (GND) | Dedicated signal ground return; separate from heat-sink ground for noise-sensitive layouts |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | EN pin accepts TTL levels to reduce total system standby current to 50 µA |
| Ultra-Low Dropout | 0.4 V at 500 mA enables use with marginal input margins (e.g., 3.3 V rail → 2.5 V load) |
| Stability with Small Capacitor | Guaranteed stable with only 2.2 µF output capacitor (0.1–10 Ω ESR), reducing board area and cost |
| Wide Temperature Range | Specified from –40°C to +125°C junction temperature for under-hood and industrial environments |
| Internal Protection | Integrated current limit and thermal shutdown prevent damage during overload or ambient overheating |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor with MCU, ADC, and wireless transceiver operating intermittently. IC Role / Device Role / Timing Role: Local LDO providing clean 2.5 V supply to precision ADC and low-power MCU core. Use Value: 50 µA shutdown current extends battery life; 0.4 V dropout allows direct regulation from partially discharged Li-ion (3.0 V). | Use Scenario: Handheld ECG device requiring low-noise analog front-end and low-power display controller. IC Role / Device Role / Timing Role: Primary 2.5 V regulator for analog signal chain and digital logic, enabled only during measurement cycles. Use Value: 50 µV RMS output noise avoids corruption of µV-level biopotential signals; EN pin synchronizes power with acquisition timing. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Under-dash module managing door locks, lighting, and CAN interface with extended temperature requirements. IC Role / Device Role / Timing Role: Secondary LDO supplying 2.5 V to microcontroller I/O and CAN transceiver bias rails. Use Value: –40°C to +125°C operation ensures reliability in engine bay proximity; 82 dB PSRR rejects alternator ripple. | Use Scenario: DIN-rail mounted meter with real-time clock, metrology ASIC, and RF communication subsystem. IC Role / Device Role / Timing Role: Precision 2.5 V reference and supply for metrology ADC and RTC oscillator circuitry. Use Value: ±2% output tolerance over temperature maintains ADC accuracy; low dropout preserves headroom from 3.3 V backup supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD2985ABU33TR | 3.3 V fixed output, same TO-220FP package, 0.35 V dropout at 500 mA, 120 µA IQ in ON mode | Not suitable for 2.5 V systems; higher IQ reduces battery life in ultra-low-power use | Select only if 3.3 V rail required and lower dropout is critical |
| LP2985AIM5-2.5/NOPB | SOT-23-5 package, 2.5 V output, 0.12 V dropout at 150 mA, 85 µA IQ in ON mode, no shutdown pin | Limited to ≤150 mA loads; lacks enable function for system-level power gating | Prefer for space-constrained PCBs where current demand ≤150 mA and shutdown not needed |
Compared with LD2985ABU33TR and LP2985AIM5-2.5/NOPB, LF25CPT uniquely delivers 2.5 V at 500 mA with integrated TTL-enable and sub-100 µA shutdown current in a thermally robust TO-220FP package-making it optimal for high-reliability, medium-current, battery-aware industrial applications.
Availability
LF25CPT is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply with long-term manufacturability.
Supply support for LF25CPT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.
The LF00 series was developed specifically for low-noise, low-power local regulation in battery-operated and thermally demanding embedded systems-emphasizing ultra-low dropout, minimal external components, and robust protection.
FAQ
What is the minimum input voltage required for regulated 2.5 V output at 500 mA?
The LF25CPT requires a minimum input voltage of 2.9 V to maintain 2.5 V output at 500 mA load, based on its 0.4 V typical dropout voltage. At 200 mA, dropout drops to 0.2 V, allowing operation from as low as 2.7 V input. Input below 2.5 V will cause the device to cease regulation entirely.
Can the LF25CPT be used without the enable (EN) pin connected?
Yes-the EN pin (pin 2) can be tied directly to VIN to force permanent ON operation, or pulled to GND via a resistor to ensure default OFF state. Leaving it floating is not recommended due to potential noise-induced toggling; STMicroelectronics specifies VIL ≤ 0.8 V and VIH ≥ 2 V for reliable logic control.
Is an input capacitor mandatory, and what value is recommended?
An input capacitor is strongly recommended: a minimum 0.1 µF ceramic capacitor placed as close as possible to pins 1 (VI) and 5 (GND) suppresses high-frequency noise and prevents instability caused by source impedance. For noisy supplies (e.g., switcher outputs), adding a 10 µF tantalum or aluminum electrolytic in parallel improves low-frequency ripple rejection.
Does the LF25CPT require a specific ESR range for the output capacitor?
Yes-the LF25CPT is optimized for output capacitors with ESR between 0.1 Ω and 10 Ω. Using ceramic capacitors below 0.1 Ω ESR (e.g., standard X7R/X5R) may cause oscillation unless a small series resistor (~0.5 Ω) is added. The datasheet validates stability with 2.2 µF tantalum (typical ESR ~1 Ω) or 2.2–10 µF low-ESR polymer capacitors.
LF25CPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 65dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LF25CPT FAQ
1.How can I place an order for LF25CPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25CPT 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 LF25CPT reliable?
The price and inventory of LF25CPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25CPT is usually 5 days.
3.What payment methods are accepted for LF25CPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25CPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25CPT?
LF25CPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25CPT 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 LF25CPT?
For technical support, including LF25CPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25CPT requirements.
6.How does Aetrix verify that LF25CPT is sourced from the original manufacturer or authorized distributors?
All LF25CPT 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 LF25CPT meets industry standards.
7.What is the process for return or replacement of LF25CPT?
All LF25CPT units undergo pre-shipment inspection (PSI). If there is an issue with LF25CPT, 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 LF25CPT part is unused and in its original packaging.
Return procedure for LF25CPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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