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Texas Instruments LM3671MF-1.8/NOPB
- Part No.:
- LM3671MF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,888
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Product details
Overview
LM3671MF-1.8/NOPB from Texas Instruments is a fixed-output 1.8 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 integrated PFET/NFET switches - used in mobile phones, digital cameras, and handheld medical devices.
For engineers reviewing the LM3671MF-1.8/NOPB datasheet, LM3671MF-1.8/NOPB pinout, LM3671MF-1.8/NOPB application, or LM3671MF-1.8/NOPB equivalent, key selection considerations include input voltage range (2.7 V to 5.5 V), fixed 1.8 V output accuracy (±4%), thermal shutdown at 150°C, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671MF-1.8/NOPB implements voltage-mode PWM control with input feed-forward compensation and automatic PFM-PWM mode transition. Its internal 0.5 V reference feeds an error amplifier that regulates output via feedback (FB) pin, while the 2-MHz oscillator enables small external components (2.2 µH inductor, two ceramic capacitors).
Operation includes cycle-by-cycle current limiting (1020 mA typical peak), undervoltage lockout, and thermal shutdown. The device uses internal synchronous rectification - eliminating external diode losses - and features soft-start with stepped current limit (70/140/280/1020 mA) to prevent inrush during enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures stable core logic supply for low-voltage microcontrollers and sensors. |
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion cell (3.0–4.2 V nominal) plus margin. |
| Max Load Current | 600 mA - sufficient for RF transceivers, camera modules, and multi-core PMIC rails in portable systems. |
| Switching Frequency | 2 MHz (typical) - allows use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life during standby in always-on sensor nodes and wearables. |
| Shutdown Current | 0.01 µA (typical) - minimizes leakage when system is powered off, critical for long-term storage or transport modes. |
| Internal FET RDS(ON) | PFET: 380–500 mΩ; NFET: 250–400 mΩ - enables >90% efficiency at 300 mA with 3.6 V input and 1.8 V output. |
Pinout & Package
LM3671MF-1.8/NOPB is housed in a 2.00 mm × 2.00 mm, 6-pin USON (NKH) package with wettable flanks, optimized for automated optical inspection and high-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor (4.7 µF ceramic); must be ≥2.7 V for operation and includes UVLO protection. |
| GND | Power Ground | Primary return path for input and output currents; requires low-impedance PCB plane connection. |
| EN | Digital Enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; must not float. |
| FB | Feedback Input | Internally connected to 1.8 V divider; tied directly to VOUT for fixed-output version - no external resistors needed. |
| SW | Switch Node | Drives external inductor; carries high di/dt switching current - requires short, wide trace and ground stitching. |
| SGND | Signal Ground | Separate ground pin for FB reference; should be connected to power GND near device for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM-PWM Mode Switching | Transitions at ~80 mA load to reduce IQ from 16 µA (light load) to maintain >85% efficiency across 10 µA–600 mA range. |
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss by ~300 mV vs. diode-based buck, improving efficiency at 1.8 V output. |
| Integrated Soft Start | Staged current limit ramp prevents input voltage sag and output overshoot during power-up with 10 µF COUT and 300 mA load. |
| Thermal Shutdown Protection | Engages at TJ = 150°C (typical) and releases at 130°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Only Three External Components | Requires just one 2.2 µH inductor and two ceramic caps (CIN = 4.7 µF, COUT = 10 µF) - simplifies BOM and layout for cost-sensitive consumer designs. |
Applications
| Mobile Phone Power Rail | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor core voltage in GSM/WCDMA smartphones operating from single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.8 V to processor I/O and memory interface blocks. Use Value: Maintains tight output regulation (±4%) across battery discharge (3.6 V → 2.8 V input), enabling reliable high-speed data transfer without brownout resets. | Use Scenario: Supplies image sensor and ISP core logic in compact digital cameras with limited board area. IC Role / Device Role / Timing Role: Fixed-output buck converter providing clean, low-noise 1.8 V rail synchronized to imaging pipeline clocking. Use Value: 2-MHz switching avoids interference with image sensor sampling frequencies; USON-6 footprint saves >30% board space vs. SOT-23 alternatives. |
| Portable Medical Sensor Node | Wireless Home-Automation Controller |
Use Scenario: Powers ultra-low-power ECG front-end ASIC and BLE radio in wearable health monitors. IC Role / Device Role / Timing Role: Efficient DC-DC stage converting battery voltage to stable 1.8 V for analog signal chain and digital logic. Use Value: 16 µA quiescent current in PFM mode extends battery life to >12 months on coin-cell-equivalent capacity; thermal shutdown prevents overheating during extended diagnostics. | Use Scenario: Supplies MCU, Zigbee/Thread radio, and touch interface in battery-operated smart home sensors. IC Role / Device Role / Timing Role: Main system regulator enabling rapid wake-from-sleep transitions with controlled inrush. Use Value: Internal soft start limits startup current to ≤1020 mA peak, preventing brownout of shared battery rail during simultaneous radio + sensor activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8 V output, 3-MHz switching, 400-mA max load, 17-µA IQ, WSON-6 package (2.0 × 2.0 mm). | Lower max current and higher fSW; less suitable for 600-mA camera flash drivers but better for ultra-thin wearables. | Select when higher switching frequency is required to shrink inductor size further, accepting reduced peak current capability. |
| AP63201WU-7 | Fixed 1.8 V output, 2-MHz fSW, 600-mA load, 25-µA IQ, TSOT-23-6 package (2.9 × 1.6 mm). | Larger SOT-23 footprint; lacks SGND pin; slightly higher quiescent current but AEC-Q200 qualified. | Choose for automotive-grade reliability where USON-6 reflow process is unavailable or thermal resistance requirements favor SOT-23. |
Compared with TPS62231DRYR and AP63201WU-7, the LM3671MF-1.8/NOPB uniquely combines 600-mA capability, 16-µA PFM IQ, and dedicated SGND in a 2.0 × 2.0 mm USON package - making it optimal for space-constrained, battery-life-critical portable designs requiring robust light-load efficiency and noise immunity.
Availability
LM3671MF-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671MF-1.8/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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and high-performance power management solutions.
The LM3671 product line delivers compact, high-efficiency DC-DC converters for battery-powered portable electronics - engineered to minimize external component count while maintaining precision regulation and robust protection features.
FAQ
What is the recommended input capacitor for LM3671MF-1.8/NOPB?
The LM3671MF-1.8/NOPB datasheet specifies a 4.7 µF ceramic input capacitor (CIN) placed close to the VIN and GND pins. This value ensures stable operation across the 2.7 V to 5.5 V input range and suppresses high-frequency switching noise. X5R or X7R dielectrics with 6.3 V or higher rating are recommended to maintain capacitance under DC bias.
Does LM3671MF-1.8/NOPB require external feedback resistors?
No. The LM3671MF-1.8/NOPB is a fixed-output variant with internal resistor divider set to 1.8 V. The FB pin connects directly to the output capacitor (COUT) - no external resistors are needed. This simplifies design and eliminates resistor tolerance errors affecting output accuracy.
What thermal protection does LM3671MF-1.8/NOPB provide?
The LM3671MF-1.8/NOPB includes internal thermal shutdown that activates at approximately 150°C junction temperature and resets at 130°C. This protects the device during sustained overload, poor PCB thermal design, or high ambient conditions. The USON-6 package has RθJA = 174.7°C/W on a 4-layer board, requiring appropriate copper pour for continuous 600-mA operation.
Can LM3671MF-1.8/NOPB operate from a 2.5 V input?
No. The LM3671MF-1.8/NOPB has a minimum input voltage of 2.7 V per its Recommended Operating Conditions. At 2.5 V, the device will not start or may drop out of regulation due to undervoltage lockout (UVLO). For sub-2.7 V operation, consider the LM3671MF-1.5/NOPB or adjustable variants with lower dropout headroom requirements.
How does the soft-start function work in LM3671MF-1.8/NOPB?
The LM3671MF-1.8/NOPB implements soft-start by progressively increasing the internal switch current limit in four steps: 70 mA → 140 mA → 280 mA → 1020 mA (typical). This occurs only when EN transitions high after VIN reaches ≥2.7 V. With a 10 µF output capacitor and 300 mA load, typical startup time is 400 µs - preventing input rail collapse and output overshoot.
LM3671MF-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM3671MF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.8/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-1.8/NOPB reliable?
The price and inventory of LM3671MF-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.8/NOPB?
LM3671MF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.8/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-1.8/NOPB?
For technical support, including LM3671MF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.8/NOPB requirements.
6.How does Aetrix verify that LM3671MF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.8/NOPB?
All LM3671MF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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