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Texas Instruments LM3671MF-1.875
- Part No.:
- LM3671MF-1.875
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.875.pdf
- Description:
- IC REG BUCK 1.875V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,012
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Product details
Overview
LM3671MF-1.875 from Texas Instruments is a fixed-output 1.875 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 operation with automatic PFM mode transition below ~50 mA load, and achieves 16 µA typical quiescent current in light-load PFM mode.
For engineers reviewing the LM3671MF-1.875 datasheet, LM3671MF-1.875 pinout, LM3671MF-1.875 application, or LM3671MF-1.875 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application use cases, and validated alternative options for low-voltage power management in space-constrained mobile systems.
Technical Context
The LM3671MF-1.875 uses voltage-mode control with input voltage feed-forward to maintain stable regulation across 2.7–5.5 V input. Its internal 0.5 V reference enables precise 1.875 V output via fixed resistor divider, with ±4% feedback voltage tolerance over temperature.
It integrates a 380 mΩ PFET switch and 250 mΩ NFET synchronous rectifier, enabling high efficiency at low output voltages. Thermal shutdown activates at 150°C (typ.), and current limiting trips at 1020 mA (typ.) in open-loop conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±4% - ensures stable core logic or I/O rail without external feedback resistors. |
| Max Output Current | 600 mA - supports moderate-power digital subsystems (e.g., baseband processors, camera ISPs) from Li-Ion input. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with fully charged (4.2 V) and deeply discharged (2.7 V) single-cell Li-Ion batteries. |
| Switching Frequency | 2 MHz (typ.) - enables use of compact 2.2 µH inductors and 10 µF ceramic output capacitors. |
| Quiescent Current | 16 µA (typ.) in PFM mode - extends battery life during standby or low-activity states in portable devices. |
| Shutdown Current | 0.01 µA (typ.) - minimizes leakage when system is powered off, critical for always-on sensors or RTC circuits. |
| Feedback Reference | 0.5 V internal - defines output as VOUT = 1.875 V = 0.5 V × (1 + R1/R2), with factory-trimmed fixed-ratio divider. |
Pinout & Package
SOT-23-5 package (DBV, 2.92 mm × 2.84 mm × 1.2 mm) with exposed pad for thermal performance. Pinout matches standard SOT-23 footprint and is electrically identical across LM3671 fixed-output variants.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; must be ≥2.7 V before enabling. |
| 2 GND | Power ground | Main return path for PFET/NFET switching current; requires low-impedance PCB connection to minimize noise. |
| 3 EN | Enable control | Logic-level input: <0.4 V = shutdown, >1.0 V = active; must not float; ties to system power-good signal. |
| 4 FB | Feedback node | Internally connected to fixed 1.875 V divider; connect directly to output capacitor for regulation. |
| 5 SW | Switching node | Drives external inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Transitions at ~50 mA (VIN = 3.6 V) to optimize efficiency across full load range without external control. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by >10% at 1.875 V/300 mA. |
| Integrated soft-start | Staged current limit (70 → 140 → 280 → 1020 mA) limits inrush; startup time ≈ 400 µs with 10 µF COUT/300 mA load. |
| Thermal & overload protection | Auto-recovery thermal shutdown at 150°C (typ.) and cycle-by-cycle current limit prevent damage under fault conditions. |
| Ultra-low shutdown current | 0.01 µA (typ.) enables true zero-power state for battery-backed subsystems or long-term storage modes. |
Applications
| Mobile Phone Baseband Power | Digital Still Camera Sensor Rail |
|---|---|
Use Scenario: Powers ARM-based baseband processor core at 1.875 V from single Li-Ion cell during call and data sessions. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.875 V supply with fast transient response to handle burst-mode CPU loads. Use Value: Maintains stable voltage under 0–600 mA dynamic load steps; PFM mode extends standby time by reducing IQ to 16 µA. |
Use Scenario: Supplies image sensor analog front-end requiring clean, low-noise 1.875 V bias from shared battery rail. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with 2 MHz switching-easily filtered to meet sensor PSRR requirements. Use Value: Internal synchronous rectification and 2.2 µH inductor enable compact layout; soft-start prevents sensor reset during power-up. |
| Portable MP3 Player Audio Codec | W-LAN Module I/O Interface |
Use Scenario: Provides 1.875 V supply to audio codec IC in battery-operated MP3 player with variable playback load. IC Role / Device Role / Timing Role: Efficient point-of-load regulator supporting 10–300 mA audio processing loads with minimal heat rise. Use Value: 130°C/W θJA (SOT-23) and thermal shutdown ensure safe operation in sealed plastic enclosures. |
Use Scenario: Powers W-LAN module's 1.875 V I/O interface in handheld hotspot device operating from 3.6 V nominal battery. IC Role / Device Role / Timing Role: Stable voltage source meeting IEEE 802.11n I/O rail tolerance (±4%) across temperature and load. Use Value: Fixed 1.875 V output eliminates need for external feedback network; EN pin synchronizes with WLAN enable signal. |
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 | 1.8 V fixed output, 600 mA, 3.6 MHz switching, 22 µA IQ in PFM mode | Higher frequency allows smaller inductor but increases EMI sensitivity; tighter 1.8 V output vs. 1.875 V requirement | Select if board layout prioritizes ultra-compact magnetics and 1.8 V is acceptable; verify system margin at 1.8 V. |
| AP3012KTR-G1 | 1.8 V fixed output, 300 mA, 1.5 MHz, no PFM mode, 40 µA IQ | Lower current rating and no light-load efficiency optimization; simpler control but less battery-friendly | Choose only for cost-sensitive, low-duty-cycle applications where 300 mA and higher quiescent current are acceptable. |
Compared with TPS62231DRYR and AP3012KTR-G1, the LM3671MF-1.875 offers exact 1.875 V output matching common DSP core requirements, superior light-load efficiency (16 µA vs. 22–40 µA), and proven thermal robustness in SOT-23 for high-density portable designs.
Availability
LM3671MF-1.875 is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, portable audio players, and W-LAN modules requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for LM3671MF-1.875 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 specializing in analog and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3671 product line delivers highly integrated, small-footprint DC-DC converters for battery-powered consumer electronics, emphasizing low IQ, automatic mode switching, and robust protection features for reliable operation in space- and energy-constrained systems.
FAQ
What is the exact output voltage tolerance of the LM3671MF-1.875?
The LM3671MF-1.875 has a fixed output voltage of 1.875 V with ±4% tolerance over temperature and line/load conditions, as specified in the Electrical Characteristics table for the MF (SOT-23) package. This corresponds to a guaranteed range of 1.800 V to 1.950 V under all operating conditions.
Does the LM3671MF-1.875 require external feedback resistors?
No, the LM3671MF-1.875 does not require external feedback resistors. It integrates a factory-trimmed resistor divider that sets the output to exactly 1.875 V. The FB pin is internally connected to this network and must be tied directly to the output capacitor for regulation.
What package type is used for the LM3671MF-1.875/NOPB ordering option?
The LM3671MF-1.875/NOPB uses the SOT-23-5 (DBV) package: 2.92 mm × 2.84 mm × 1.2 mm, lead-free, with an exposed thermal pad. This is confirmed in TI's Ordering Information table and Package Option Addendum for the MF suffix.
How does the LM3671MF-1.875 transition between PWM and PFM modes?
The LM3671MF-1.875 automatically transitions based on load: at VIN = 3.6 V, it switches from PWM to PFM below ~50 mA and back to PWM above ~100 mA. Transition thresholds scale with input voltage-e.g., ~35 mA down / ~85 mA up at VIN = 2.7 V-ensuring optimal efficiency across battery discharge.
Can the LM3671MF-1.875 operate from a 2.5 V input?
No, the LM3671MF-1.875 requires a minimum input voltage of 2.7 V per its Operating Ratings. At 2.5 V, the device will not regulate and may enter undervoltage lockout; operation below 2.7 V is outside specification and not guaranteed.
LM3671MF-1.875 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):
- 1.875V
- 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-1.875 FAQ
1.How can I place an order for LM3671MF-1.875 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.875 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-1.875 reliable?
The price and inventory of LM3671MF-1.875 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-1.875 is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.875?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.875 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.875?
LM3671MF-1.875 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.875 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-1.875?
For technical support, including LM3671MF-1.875 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.875 requirements.
6.How does Aetrix verify that LM3671MF-1.875 is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.875 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-1.875 meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.875?
All LM3671MF-1.875 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.875, 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-1.875 part is unused and in its original packaging.
Return procedure for LM3671MF-1.875:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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