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Texas Instruments LM3671MF-1.875/NOPB
- Part No.:
- LM3671MF-1.875/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.875/NOPB.pdf
- Description:
- IC REG BUCK 1.875V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
LM3671MF-1.875/NOPB from Texas Instruments is a fixed-output 1.875 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 phone core logic power rails.
For engineers reviewing the LM3671MF-1.875/NOPB datasheet, LM3671MF-1.875/NOPB pinout, LM3671MF-1.875/NOPB application, or LM3671MF-1.875/NOPB equivalent, key selection criteria include input voltage range (2.7 V–5.5 V), output accuracy (±4% over −40°C to +125°C), thermal shutdown (150°C typical), synchronous rectification efficiency, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671MF-1.875/NOPB employs voltage-mode control with input feed-forward compensation to maintain stable regulation across line and load variations. Its integrated PFET/NFET power stage enables synchronous rectification, eliminating external diode losses and supporting high efficiency at low output voltages.
Operation spans three distinct modes: PWM (fixed 2 MHz switching, >80 mA load), PFM (variable frequency, 16 µA IQ, <80 mA load), and shutdown (0.01 µA). Mode transitions are fully automatic and governed by zero-current detection and peak current thresholds - no external control required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±4% over −40°C to +125°C - ensures stable core supply for 1.8 V I/O or low-voltage microcontrollers. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct operation from single Li-Ion (3.0–4.2 V) or USB-powered systems without pre-regulation. |
| Max Load Current | 600 mA continuous - sufficient for baseband processors, RF transceivers, or multi-core SoCs in handheld devices. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp) - enables use of compact 2.2 µH inductors and ceramic capacitors in <2 mm² footprint designs. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime during standby/sleep states in always-on applications. |
| Shutdown Current | 0.01 µA typical - minimizes leakage when system is powered off, critical for long-term storage or emergency backup. |
| Feedback Reference | 0.5 V internal bandgap - sets output via internal resistor divider; eliminates external feedback network for fixed versions. |
Pinout & Package
LM3671MF-1.875/NOPB uses the USON-6 (NKH) package: 2.00 mm × 2.00 mm, 0.5 mm pitch, bottom-exposed thermal pad. This thermally enhanced leadless package supports high-power density layouts and improved heat dissipation in thin-profile portable assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input connection (2.7–5.5 V); requires local 4.7 µF ceramic capacitor to minimize high-frequency ripple and ESR-related instability. |
| GND | Power Ground | System ground reference for power path; must be connected directly to thermal pad and low-impedance PCB plane to ensure thermal performance and noise immunity. |
| EN | Digital Enable | Active-high logic control (VIH ≥1 V, VIL ≤0.4 V); floating state disables device - requires pull-down resistor if not actively driven. |
| FB | Feedback Input | Internally connected to fixed 1.875 V divider; not user-accessible - unused pin in fixed-output variants; must remain unconnected. |
| SW | Switch Node | Internal PFET drain/NFET source connection; drives external 2.2 µH inductor - requires tight layout with minimal trace length to reduce EMI and switching losses. |
| SGND | Signal Ground | Separate feedback ground terminal; ties internally to GND but routed separately on PCB to isolate analog sensing from power return noise. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Enables seamless transition between high-efficiency light-load operation (16 µA IQ) and low-noise full-load regulation (2 MHz fixed frequency) without external configuration. |
| Internal synchronous rectification | Integrates PFET/NFET power switches - eliminates external Schottky diode, reduces conduction loss, and improves full-load efficiency by ~8–12% vs. asynchronous buck. |
| Internal soft-start | Ramps switch current limit in four steps (70/140/280/1020 mA) - prevents inrush current into output capacitor and avoids input rail droop during power-up. |
| Thermal shutdown protection | Engages at 150°C junction temperature and releases at 130°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Only three external components | Requires only 2.2 µH inductor, 4.7 µF input cap, and 10 µF output cap - simplifies BOM, reduces board area, and accelerates design validation. |
Applications
| Mobile Phone Baseband Power | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Powers ARM-based baseband processor core (1.8 V domain) from single-cell Li-ion battery in smartphone mainboard. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.875 V at up to 600 mA with fast transient response to CPU burst loads. Use Value: Maintains stable core voltage during 2G/3G/4G radio transmission bursts while minimizing battery drain via PFM mode during idle periods. |
Use Scenario: Supplies low-noise 1.875 V rail to ADC, sensor interface ICs, and BLE SoC in handheld glucose monitor or pulse oximeter. IC Role / Device Role / Timing Role: High-PSRR, low-ripple power source enabling accurate 12-bit analog measurements under varying battery conditions. Use Value: Delivers <10 mVpp output ripple and 16 µA quiescent current - extends single AAA battery life beyond 6 months in intermittent-use clinical devices. |
| WLAN Module Core Supply | Automotive Infotainment Display Logic |
Use Scenario: Provides 1.875 V core voltage to IEEE 802.11n WLAN chipset in tablet or hotspot device operating from 3.3 V system rail. IC Role / Device Role / Timing Role: Compact, high-frequency buck converter enabling small form factor and minimal EMI coupling into RF front-end. Use Value: 2 MHz switching allows use of 1.0 mm × 1.0 mm 2.2 µH inductor - reduces solution size by 40% vs. 500 kHz alternatives while meeting FCC Class B emissions. |
Use Scenario: Powers display controller ASIC and touch interface logic in automotive center-stack display unit with AEC-Q100-compliant requirements. IC Role / Device Role / Timing Role: Secondary point-of-load regulator deriving 1.875 V from 3.3 V or 5 V domain in harsh-temperature automotive environment. Use Value: Operates reliably from −40°C to +125°C ambient with thermal shutdown - meets Grade 1 automotive qualification without derating. |
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 1.8 V output (not 1.875 V); 3 MHz switching; 1.8–6.5 V input; 300 mA max load. | Better suited for ultra-thin wearables requiring higher frequency and smaller inductors, but lower current capability limits use in multi-rail systems. | Select when 1.8 V tolerance is acceptable and board space is constrained below 1.5 mm². |
| AP63202-W5-7 | Adjustable output (0.6–5.5 V); 2.5 MHz switching; 2.5–5.5 V input; 2 A max load; WLCSP-6 package. | Higher current and adjustable output support flexible power architecture, but lacks factory-trimmed 1.875 V option and requires external feedback resistors. | Select when future voltage scaling or higher load headroom (>600 mA) is required, accepting added BOM complexity. |
Compared with TPS62231DRYR and AP63202-W5-7, LM3671MF-1.875/NOPB provides exact 1.875 V factory-set output, optimal 2 MHz/600 mA balance for portable Li-ion systems, and USON-6 thermal performance - making it the most direct fit for space- and accuracy-sensitive 1.8 V domain applications without redesign overhead.
Availability
LM3671MF-1.875/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical instruments, and automotive infotainment displays requiring stable component supply across production lifecycles.
Supply support for LM3671MF-1.875/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 specializing in analog, embedded processing, and power management technologies - serving industrial, automotive, and consumer markets with high-reliability silicon solutions.
LM3671MF-1.875/NOPB belongs to TI's portable power management portfolio, designed specifically for ultra-low-power, high-efficiency DC-DC conversion in battery-operated handheld and wearable electronics.
FAQ
What is the output voltage tolerance of LM3671MF-1.875/NOPB over temperature and load?
The LM3671MF-1.875/NOPB guarantees ±4% output voltage accuracy over the full operating temperature range (−40°C to +125°C) and load current (0–600 mA), as specified in the electrical characteristics table under "Feedback voltage (fixed) MF" test condition. This tolerance includes initial trim, line regulation (0.031%/V), and load regulation (0.0013%/mA) contributions - ensuring robust performance in thermally dynamic portable environments without external trimming.
Can LM3671MF-1.875/NOPB operate from a 2.5 V input?
No - LM3671MF-1.875/NOPB has a minimum recommended input voltage of 2.7 V per the datasheet's Recommended Operating Conditions table. At 2.5 V, the device may fail to start or drop out of regulation due to insufficient headroom above the 1.875 V output plus internal dropout (determined by PFET RDSON and inductor DCR). Operation below 2.7 V is outside specification and not guaranteed.
Does LM3671MF-1.875/NOPB require an external feedback resistor network?
No - LM3671MF-1.875/NOPB is a fixed-output variant with internal resistor divider set to 1.875 V. The FB pin is internally connected and must remain unconnected on the PCB. External resistors are only required for the adjustable (ADJ) version such as LM3671MF-ADJ/NOPB.
What thermal performance can be expected from LM3671MF-1.875/NOPB in a 4-layer board layout?
In a standard 4-layer PCB with 2 oz copper and thermal vias under the USON-6 thermal pad, LM3671MF-1.875/NOPB exhibits RθJA = 174.7°C/W. At 600 mA load and 3.6 V input, power dissipation is ~360 mW - resulting in ~63°C junction-to-ambient rise. With 25°C ambient, junction temperature reaches ~88°C, well below the 125°C maximum rating and thermal shutdown threshold of 150°C.
Is LM3671MF-1.875/NOPB qualified for automotive applications?
No - LM3671MF-1.875/NOPB is the commercial-grade version. For automotive use, TI offers the LM3671-Q1 variant (e.g., LM3671QMF-1.875/NOPB), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient), includes enhanced ESD robustness (±750 V CDM on corner pins), and undergoes additional reliability testing. The -Q1 suffix is mandatory for automotive deployment.
LM3671MF-1.875/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):
- 1.875V
- 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/NOPB FAQ
1.How can I place an order for LM3671MF-1.875/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.875/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-1.875/NOPB reliable?
The price and inventory of LM3671MF-1.875/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-1.875/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.875/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.875/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.875/NOPB?
LM3671MF-1.875/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.875/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-1.875/NOPB?
For technical support, including LM3671MF-1.875/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.875/NOPB requirements.
6.How does Aetrix verify that LM3671MF-1.875/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.875/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-1.875/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.875/NOPB?
All LM3671MF-1.875/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.875/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-1.875/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-1.875/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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