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Texas Instruments LM3671MF-2.5/NOPB
- Part No.:
- LM3671MF-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
LM3671MF-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It delivers up to 600 mA load current with 16 µA typical quiescent current in PFM mode, internal soft start, and automatic PWM/PFM mode switching - used in mobile phones and digital still cameras for efficient core voltage regulation.
For engineers reviewing the LM3671MF-2.5/NOPB datasheet, LM3671MF-2.5/NOPB pinout, LM3671MF-2.5/NOPB application, or LM3671MF-2.5/NOPB equivalent, key selection criteria include input voltage range (2.7 V to 5.5 V), fixed 2.5 V output accuracy (±4%), thermal shutdown at 150°C, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671MF-2.5/NOPB employs voltage-mode control with input-voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input. Its integrated PFET/NFET synchronous rectifier enables high efficiency at low output voltages, while the 2-MHz fixed-frequency PWM operation minimizes external component size.
Automatic transition between PWM (≥80 mA load) and hysteretic PFM (<80 mA) modes ensures optimal efficiency across load conditions. The device uses an internal 0.5 V reference and fixed feedback divider to regulate 2.5 V output without external resistors, and includes cycle-by-cycle current limiting (1020 mA typical) and thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% over −40°C to +125°C - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct operation from single Li-Ion (3.0–4.2 V) or regulated 3.3 V/5 V rails. |
| Max Load Current | 600 mA continuous - sufficient for powering baseband processors, camera modules, or RF transceivers. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp) - enables use of compact 2.2 µH inductors and 10 µF ceramic output capacitors. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby or light-load operation in portable devices. |
| Shutdown Current | 0.01 µA typical - reduces system leakage when powered off, critical for always-on sensor nodes. |
| Current Limit | 1020 mA typical open-loop peak switch current - provides robust short-circuit and overload protection without external sensing. |
Pinout & Package
LM3671MF-2.5/NOPB is housed in a 2.00 mm × 2.00 mm, 0.5 mm height USON-6 (NKH) package with wettable flanks for automated optical inspection. Thermal resistance RθJA = 174.7°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be decoupled locally to suppress switching noise. |
| SW | Switching node | Drives external inductor; carries high di/dt - requires short, low-inductance trace to minimize EMI and voltage spikes. |
| FB | Feedback input | Internally connected to fixed 2.5 V divider - no external resistors needed; connect directly to output capacitor for stability. |
| EN | Enable control | Digital logic input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; must not float - tie to VIN or microcontroller GPIO. |
| GND | Power ground | Primary return path for input/output currents; connect to solid ground plane under IC for thermal and EMI performance. |
| SGND | Signal ground | Internal feedback reference ground - internally bonded to GND in USON-6; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode - improves full-load efficiency by ~8–12% vs. asynchronous buck at 2.5 V output. |
| Automatic PWM/PFM mode switching | Seamlessly transitions at ~80 mA load - maintains >85% efficiency from 1 mA to 600 mA without manual control. |
| Integrated soft-start | Ramps current limit in 4 steps (70/140/280/1020 mA) - prevents inrush into 10 µF output caps and avoids input rail droop. |
| Thermal shutdown with hysteresis | Shuts down at TJ = 150°C (typ), resumes at 130°C - protects against sustained overload or poor heatsinking. |
| Only three external components | Requires just one 2.2 µH inductor and two ceramic caps (CIN, COUT) - reduces BOM count and board area vs. discrete solutions. |
Applications
| Mobile Phone Power Management | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Regulating 2.5 V for image signal processor (ISP) and CMOS sensor interface in slim smartphone designs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise 2.5 V from shared 3.6 V battery rail. Use Value: 2-MHz switching avoids audible noise and allows tiny 2.2 µH inductor placement near ISP - reducing EMI coupling into analog video paths. |
Use Scenario: Powering flash memory controller and lens actuator driver in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying stable 2.5 V during burst capture and autofocus sequences. Use Value: 600 mA capability supports simultaneous write-to-flash and motor drive; PFM mode extends standby time between shots. |
| Portable Medical Sensor Node | Wireless Home-Automation Hub |
Use Scenario: Providing regulated 2.5 V to ultra-low-power biosensor analog front-end (AFE) and BLE SoC in wearable patches. IC Role / Device Role / Timing Role: Always-on power stage enabling sub-10 µA system sleep current via deep shutdown control. Use Value: 0.01 µA shutdown current and 16 µA PFM quiescent draw maximize battery life in coin-cell–powered devices. |
Use Scenario: Generating 2.5 V for Zigbee/Thread radio transceiver and microcontroller in battery-backed smart home gateway. IC Role / Device Role / Timing Role: Efficient intermediate rail converter stepping down from 3.3 V LDO or boost output. Use Value: Internal synchronous rectification achieves >90% efficiency at 100–300 mA - minimizing heat buildup in sealed enclosures. |
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 |
|---|---|---|---|
| TPS62231DRYR | Fixed 2.5 V, 3-MHz switching, 300 mA max output - smaller 1.2 mm × 1.2 mm DSBGA but lower current rating. | Targeted at ultra-compact wearables with <300 mA loads; lacks thermal shutdown hysteresis. | Select when board area is constrained and load never exceeds 300 mA - verify thermal margin with RθJA = 210°C/W. |
| AP63202WU-7 | Adjustable 0.6–5.5 V output, 2-MHz, 2 A max - larger SOT-563 package, higher IQ (25 µA), no PFM mode. | Suitable for multi-rail systems requiring flexibility; requires external feedback resistors and larger inductor. | Choose when adjustable output or >600 mA capability is needed - accept higher quiescent current and added BOM complexity. |
Compared with TPS62231DRYR, LM3671MF-2.5/NOPB delivers 100% more current in the same footprint-class package; versus AP63202WU-7, it offers superior light-load efficiency and simpler fixed-output implementation at the cost of adjustability.
Availability
LM3671MF-2.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LM3671MF-2.5/NOPB 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 leader designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LM3671 product line delivers highly integrated, space-efficient DC-DC converters for battery-powered portable electronics - engineered to minimize external components while maintaining high efficiency across wide load ranges.
FAQ
What is the recommended input capacitor for LM3671MF-2.5/NOPB?
The LM3671MF-2.5/NOPB datasheet specifies a minimum 4.7 µF X5R/X7R ceramic capacitor at the VIN pin, placed as close as possible to the device. TI recommends using a 10 µF capacitor for improved transient response and reduced input ripple - especially when operating near the 2.7 V lower input limit. The capacitor must have low ESR and be rated for ≥6.3 V.
Does LM3671MF-2.5/NOPB require external feedback resistors?
No, LM3671MF-2.5/NOPB does not require external feedback resistors. It integrates a precision resistor divider to set the output to 2.5 V ±4%, with the FB pin internally connected to this network. External resistors are only needed for the adjustable versions (e.g., LM3671MF-ADJ); connecting them to LM3671MF-2.5/NOPB will disrupt regulation.
What is the thermal shutdown behavior of LM3671MF-2.5/NOPB?
LM3671MF-2.5/NOPB engages thermal shutdown at a junction temperature of 150°C (typical) and resumes operation once TJ falls to 130°C (typical). This hysteresis prevents cycling during sustained overload. The USON-6 package has RθJA = 174.7°C/W on a 4-layer board - adequate for 600 mA loads with proper copper pour, but derating is required above 60°C ambient.
Can LM3671MF-2.5/NOPB operate from a 2.7 V input?
Yes, LM3671MF-2.5/NOPB is fully specified to operate from 2.7 V input across its entire temperature range (−40°C to +125°C). At 2.7 V input and 2.5 V output, the duty cycle approaches 93%, so efficiency drops slightly (~82% at 600 mA), but regulation remains stable. TI advises ensuring input capacitance and layout minimize voltage drop at VIN during peak load.
Is LM3671MF-2.5/NOPB qualified for automotive applications?
No, LM3671MF-2.5/NOPB is not automotive-qualified. The automotive-grade variant is LM3671-Q1 (e.g., LM3671QMF-2.5/NOPB), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient) and tested to stricter ESD and reliability standards. LM3671MF-2.5/NOPB is intended for commercial portable electronics and lacks the automotive qualification documentation and screening.
LM3671MF-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM3671MF-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-2.5/NOPB 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/NOPB reliable?
The price and inventory of LM3671MF-2.5/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-2.5/NOPB?
LM3671MF-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-2.5/NOPB 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/NOPB?
For technical support, including LM3671MF-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-2.5/NOPB requirements.
6.How does Aetrix verify that LM3671MF-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-2.5/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-2.5/NOPB?
All LM3671MF-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-2.5/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671MF-2.5/NOPB Tags
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