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Texas Instruments LM3671MF-2.5
- Part No.:
- LM3671MF-2.5
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-2.5.pdf
- Description:
- IC REG BUCK 2.5V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,752
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Product details
Overview
LM3671MF-2.5 from Texas Instruments is a fixed-output 2.5 V, 600 mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM switching (typ.), features automatic PFM/PWM mode transition, and achieves 16 µA typical quiescent current in light-load PFM mode. It powers core logic rails in mobile phones and digital still cameras.
For engineers reviewing the LM3671MF-2.5 datasheet, LM3671MF-2.5 pinout, LM3671MF-2.5 application, or LM3671MF-2.5 equivalent, key selection criteria include its 2.5 V fixed output, SOT-23-5 package compatibility, 600 mA load capability, 2 MHz switching frequency enabling compact 2.2 µH inductor use, and integrated synchronous rectification eliminating external diode requirements.
Technical Context
The LM3671MF-2.5 implements voltage-mode control with input-voltage feed-forward for stable line regulation. Its internal 0.5 V reference feeds a feedback amplifier that compares FB voltage against this threshold to adjust PFET on-time via a ramp generator and PWM comparator.
It integrates a 380 mΩ PFET switch and 250 mΩ NFET synchronous rectifier, enabling high efficiency across 10 mA–600 mA loads. Thermal shutdown activates at 150°C (typ.), and undervoltage lockout prevents operation below 2.7 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% over −40°C to +125°C junction temperature |
| Input Voltage Range | 2.7 V to 5.5 V - supports full range of single Li-Ion (3.0–4.2 V) and USB 5 V rails |
| Max Output Current | 600 mA - sustained under thermal limits with SOT-23 package on 4-layer board |
| Switching Frequency | 2 MHz (typ.) - enables use of tiny 2.2 µH inductors and low-ESR ceramic capacitors |
| Quiescent Current | 16 µA (typ.) in PFM mode - extends battery life during standby in portable devices |
| Shutdown Current | 0.01 µA (typ.) - minimizes leakage when EN < 0.4 V |
| Feedback Reference | 0.5 V internal bandgap - sets output via internal resistor divider for fixed-voltage variants |
Pinout & Package
SOT-23-5 package (DBV), 2.92 mm × 2.84 mm × 1.2 mm body, lead-free (NOPB) variant. Pin 1 = VIN, Pin 2 = GND, Pin 3 = EN, Pin 4 = FB, Pin 5 = SW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Connects directly to input filter capacitor; accepts 2.7–5.5 V; must be ≥2.7 V before enabling |
| GND (Pin 2) | Power ground | Primary return path for PFET/NFET current and bias circuits; requires low-impedance PCB plane |
| EN (Pin 3) | Enable control input | Active-high logic: device enabled when >1.0 V, shutdown when <0.4 V; must not float |
| FB (Pin 4) | Feedback analog input | Monitors regulated output; internally connected to 2.5 V divider - no external resistors required |
| SW (Pin 5) | Switching node | Drives external inductor; carries high di/dt; requires short, low-inductance PCB trace to minimize EMI |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency at 2.5 V output |
| Automatic PFM/PWM mode switching | Transitions seamlessly at ~50–100 mA (depending on VIN), optimizing efficiency across full load range |
| Internal soft-start | Staged current limit (70/140/280/1020 mA) prevents inrush into 10 µF output caps with 300 mA load |
| Thermal and overload protection | Current limit trips at 1020 mA (typ.); thermal shutdown engages at 150°C (typ.) with hysteresis |
| Minimal external components | Only one 2.2 µH inductor and two ceramic capacitors (CIN=4.7 µF, COUT=10 µF) required for full operation |
Applications
| Mobile Phone Core Logic Supply | Digital Still Camera Image Sensor Rail |
|---|---|
Use Scenario: Powers baseband processor or application SoC core voltage in slim smartphone designs using single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 2.5 V at up to 600 mA with fast transient response to burst-mode CPU loads. Use Value: 2 MHz switching enables compact 2.2 µH inductor and small 10 µF ceramic output cap, saving PCB area in space-constrained layouts. |
Use Scenario: Supplies image sensor analog front-end requiring low-noise, tightly regulated 2.5 V from shared battery rail. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with PFM mode maintaining 16 µA IQ during sensor idle periods. Use Value: Automatic PFM-to-PWM transition within 100 µs ensures stable 2.5 V during rapid exposure bursts without external sequencing. |
| Portable MP3 Player Audio Codec | W-LAN Module Baseband Voltage |
Use Scenario: Provides clean 2.5 V supply to audio codec IC in battery-operated MP3 players with dynamic volume control. IC Role / Device Role / Timing Role: Efficient step-down regulator with low 0.01 µA shutdown current preserving battery during playback pause. Use Value: Integrated synchronous rectifier achieves >90% efficiency at 100 mA, minimizing heat in sealed plastic enclosures. |
Use Scenario: Powers W-LAN baseband processor in handheld hotspot devices operating across 2.7–4.2 V battery range. IC Role / Device Role / Timing Role: Input-voltage feed-forward compensated buck controller ensuring ±1% output regulation despite battery sag. Use Value: 2.7–5.5 V input range accommodates full Li-Ion discharge curve while maintaining 2.5 V ±4% accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 2.5 V fixed, 600 mA, 3 MHz switching, 17 µA IQ, WSON-6 package (2.0 × 2.0 mm) | Higher switching frequency allows smaller 1 µH inductor; requires different PCB footprint and layout | Select when board space is constrained and 3 MHz operation is acceptable for noise filtering |
| AP3012KTR-G1 | 2.5 V fixed, 500 mA, 1.5 MHz switching, 25 µA IQ, SOT-23-5 package (pin-compatible) | Lower max current and higher IQ reduce battery runtime under heavy load; same pinout enables drop-in evaluation | Select for cost-sensitive designs where 500 mA peak load suffices and 2.5 µA higher IQ is acceptable |
Compared with LM3671MF-2.5, TPS62231DRVR offers higher frequency and smaller passive size but demands new layout, while AP3012KTR-G1 shares the SOT-23-5 footprint but trades 100 mA current headroom and 9 µA quiescent current for lower cost.
Availability
LM3671MF-2.5 is available at Aetrix Electronics and suitable for mobile phone power management, digital camera sensor supplies, and portable audio codec rails requiring stable component supply with long-term lifecycle support.
Supply support for LM3671MF-2.5 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad automotive, industrial, and consumer product portfolios.
The LM3671 product line delivers highly integrated, low-quiescent-current buck converters for space- and battery-constrained portable electronics, emphasizing minimal external components and seamless light-load efficiency.
FAQ
What is the recommended input capacitor for LM3671MF-2.5?
The LM3671MF-2.5 datasheet specifies a 4.7 µF ceramic input capacitor placed close to the VIN and GND pins. This value provides sufficient charge reservoir for 2 MHz switching transients and meets ripple current rating requirements under 600 mA load conditions. X5R or X7R dielectrics with 6.3 V or higher voltage rating are recommended for stability across temperature.
Does LM3671MF-2.5 require an external feedback resistor network?
No. The LM3671MF-2.5 is a fixed-output variant with internal resistor divider configured for 2.5 V. The FB pin connects directly to the output capacitor; no external resistors are needed. External dividers are only required for the adjustable version (LM3671MF-ADJ/NOPB).
What is the thermal performance of LM3671MF-2.5 in SOT-23 package?
In the SOT-23-5 (DBV) package on a standard 4-layer PCB, the LM3671MF-2.5 has a junction-to-ambient thermal resistance (θJA) of 130°C/W. At 600 mA load and 3.6 V input, power dissipation is ~300 mW, resulting in ~39°C junction-to-ambient rise above ambient - well within the −40°C to +125°C operating range.
How does LM3671MF-2.5 transition between PFM and PWM modes?
The LM3671MF-2.5 monitors inductor current zero-crossing and PFET peak current. It transitions from PWM to PFM when load drops below ~50–100 mA (VIN-dependent), and back to PWM when output voltage falls below the "low2" PFM threshold (~0.6% below nominal). This occurs automatically without external control signals.
Is LM3671MF-2.5 compatible with ceramic output capacitors?
Yes. The LM3671MF-2.5 is explicitly designed for ceramic output capacitors, with the typical application circuit specifying a 10 µF X5R/X7R ceramic capacitor. Its internal compensation is optimized for low-ESR ceramics, ensuring stability without additional series resistance or tantalum alternatives.
LM3671MF-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3671MF-2.5 FAQ
1.How can I place an order for LM3671MF-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-2.5 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 LM3671MF-2.5 reliable?
The price and inventory of LM3671MF-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-2.5 is usually 5 days.
3.What payment methods are accepted for LM3671MF-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-2.5?
LM3671MF-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-2.5 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 LM3671MF-2.5?
For technical support, including LM3671MF-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-2.5 requirements.
6.How does Aetrix verify that LM3671MF-2.5 is sourced from the original manufacturer or authorized distributors?
All LM3671MF-2.5 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 LM3671MF-2.5 meets industry standards.
7.What is the process for return or replacement of LM3671MF-2.5?
All LM3671MF-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-2.5, 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 LM3671MF-2.5 part is unused and in its original packaging.
Return procedure for LM3671MF-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671MF-2.5 Tags
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