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Texas Instruments LM3671MF-2.8/NOPB
- Part No.:
- LM3671MF-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-2.8/NOPB.pdf
- Description:
- IC REG BUCK 2.8V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
LM3671MF-2.8/NOPB from Texas Instruments is a fixed-output 2.8 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 with automatic PFM mode transition, and achieves 16 µA typical quiescent current in light-load operation - enabling extended battery life in mobile phones and handheld instruments.
For engineers reviewing the LM3671MF-2.8/NOPB datasheet, LM3671MF-2.8/NOPB pinout, LM3671MF-2.8/NOPB application, or LM3671MF-2.8/NOPB equivalent, key selection criteria include its 2.8 V fixed output voltage accuracy (±4%), internal synchronous rectification (PFET/NFET), soft-start functionality, thermal shutdown protection, and compatibility with only three external components: one 2.2 µH inductor and two ceramic capacitors.
Technical Context
The LM3671MF-2.8/NOPB implements a voltage-mode PWM controller with input voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input range. Its internal 0.5 V reference feeds a precision error amplifier that compares FB voltage against this threshold to adjust duty cycle.
It features dual-mode operation: fixed 2-MHz PWM at ≥80 mA load for low-noise performance, and hysteretic PFM at lighter loads to reduce IQ to 16 µA. Internal PFET (RDSON = 380–500 mΩ) and NFET (RDSON = 250–400 mΩ) switches enable synchronous rectification, eliminating external diode losses and improving efficiency at low output voltages like 2.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - eliminates need for external feedback resistors and ensures stable rail for 2.8 V logic or analog circuitry. |
| Max Output Current | 600 mA - supports moderate-power subsystems such as RF transceivers or display drivers without external current boosting. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (fully charged to 4.2 V, discharged to 2.7 V) and regulated 3.3 V/5 V rails. |
| Switching Frequency | 2 MHz (typical) - enables use of ultra-small 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends standby time in always-on sensors or Bluetooth LE peripherals. |
| Shutdown Current | 0.01 µA (typical) - near-zero battery drain during system sleep, critical for long-life portable medical devices. |
| Feedback Reference | 0.5 V internal - sets output via internal resistor divider (VOUT = 0.5 V × (1 + R1/R2)); for LM3671MF-2.8/NOPB, R1/R2 ratio is factory-trimmed for 2.8 V. |
Pinout & Package
LM3671MF-2.8/NOPB is housed in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm, with wettable flank leads for automated optical inspection (AOI) and enhanced solder joint reliability in high-volume SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply; internal UVLO disables operation below 2.7 V. |
| GND | Power Ground | Primary return path for input and output currents; must be low-impedance connection to minimize noise coupling. |
| EN | Digital Enable | Active-high logic control; device enabled when EN ≥ 1 V, shut down when EN ≤ 0.4 V; must not float. |
| FB | Analog Feedback | Internally connected to fixed 2.8 V divider; no external resistors required; connects directly to output capacitor for regulation. |
| SW | Switch Node | Drives external 2.2 µH inductor; carries high di/dt switching current; requires tight layout with minimal trace length and ground pour. |
| SGND | Signal Ground | Separate feedback ground pin; ties internally to GND but routed separately on PCB to avoid noise injection into FB path. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Integrated PFET + NFET switches eliminate external Schottky diode, reducing conduction loss and improving full-load efficiency by ~8–12% vs. asynchronous designs. |
| Automatic PFM-PWM Transition | Seamlessly shifts between 2-MHz PWM (≥80 mA) and variable-frequency PFM (<80 mA) without external control, optimizing efficiency across 1 µA–600 mA load range. |
| Internal Soft Start | Ramps switch current limit in four steps (70/140/280/1020 mA) to limit inrush current during power-up, preventing input rail collapse in battery-fed systems. |
| Thermal & Overcurrent Protection | Thermal shutdown engages at TJ ≈ 150°C and releases at ≈130°C; cycle-by-cycle peak current limit (1020 mA typ.) prevents damage during short-circuit or overload events. |
| Minimal External Components | Only three passive parts required: 2.2 µH shielded inductor, 4.7 µF input ceramic capacitor, and 10 µF output ceramic capacitor - simplifies BOM and layout. |
Applications
| Mobile Phone Power Management | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor I/O and camera module interface in compact smartphone designs where board space and battery runtime are constrained. IC Role / Device Role / Timing Role: Primary 2.8 V buck regulator delivering clean, regulated power with fast transient response to dynamic processor load changes. Use Value: 2-MHz switching enables tiny 2.2 µH inductor and 10 µF output cap, reducing solution size by >40% vs. 500-kHz alternatives while maintaining <20 mV output ripple under 400 mA load steps. | Use Scenario: Supplies 2.8 V rail to low-power ECG front-end ASIC and BLE radio in wearable cardiac monitor worn continuously for 7+ days. IC Role / Device Role / Timing Role: Always-on power stage operating in PFM mode during patient rest periods, transitioning to PWM during data transmission bursts. Use Value: 16 µA quiescent current in PFM mode extends battery life; 0.01 µA shutdown current allows firmware-controlled deep-sleep states without hardware reset. |
| Wireless Handheld Terminal | Industrial Portable Data Logger |
Use Scenario: Powers barcode scanner engine and secure element in ruggedized handheld POS terminal used in retail and logistics environments. IC Role / Device Role / Timing Role: High-efficiency 2.8 V source supporting intermittent 500 mA peak loads during laser scanning, with robust thermal protection for sealed enclosures. Use Value: Internal thermal shutdown (150°C trip) and current limiting prevent field failures due to ambient temperature rise or accidental short circuits during connector mating. | Use Scenario: Provides stable 2.8 V supply to microcontroller, SD card interface, and environmental sensor array in battery-operated field data logger deployed in remote locations. IC Role / Device Role / Timing Role: Primary DC-DC converter handling wide-input (2.7–5.5 V) variation from aging Li-SOCl₂ primary cells while maintaining regulation tolerance. Use Value: 2.7 V minimum input enables full utilization of cell capacity down to end-of-life; ±4% output accuracy ensures reliable ADC reference and digital logic operation. |
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 | Fixed 2.8 V output, 600 mA, 3-MHz switching, 17 µA IQ - slightly higher frequency and identical load capability but lacks internal soft start. | Requires external soft-start capacitor for inrush control; better suited for noise-sensitive RF sections due to higher switching frequency. | Select TPS62231DRVR if 3-MHz operation is preferred for smaller magnetics and tighter EMI filtering is needed. |
| AP63202WU-7 | Fixed 2.8 V output, 2-A max, 2-MHz switching, 25 µA IQ - higher current rating and same frequency, but larger 2.5 mm × 2.5 mm WLCSP package. | Supports future-proofing for higher-current peripherals; requires re-layout due to different footprint and thermal pad configuration. | Select AP63202WU-7 only if system load headroom >600 mA is required and PCB area permits larger WLCSP placement. |
Compared with TPS62231DRVR and AP63202WU-7, the LM3671MF-2.8/NOPB offers integrated soft start and USON packaging optimized for space-constrained portable designs, while maintaining identical 2.8 V accuracy and 2-MHz operation - making it ideal for cost-sensitive, volume-manufactured handheld devices where layout simplicity and proven reliability are prioritized.
Availability
LM3671MF-2.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical equipment, and wireless handheld terminals requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LM3671MF-2.8/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 leader designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3671 product line delivers highly integrated, low-quiescent-current DC-DC converters targeting battery-powered portable devices - emphasizing minimal external components, small footprint, and intelligent power management across light-to-heavy load conditions.
FAQ
What is the recommended input capacitor for LM3671MF-2.8/NOPB?
The LM3671MF-2.8/NOPB datasheet specifies a 4.7 µF ceramic capacitor (X5R or X7R, 6.3 V rating) placed as close as possible to the VIN and GND pins. This value suppresses high-frequency switching noise and maintains stability during load transients. Larger values (e.g., 10 µF) may improve ripple but are not required for basic operation.
Does LM3671MF-2.8/NOPB require an external feedback resistor network?
No. The LM3671MF-2.8/NOPB is a fixed-output variant with internal resistor divider trimmed to deliver 2.8 V. The FB pin connects directly to the output capacitor; no external resistors are needed or supported. Using external resistors would disrupt regulation and is not permitted per TI's design guidelines.
What is the thermal performance of LM3671MF-2.8/NOPB in its USON package?
The LM3671MF-2.8/NOPB in the 6-pin USON (NKH) package has a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W on a 4-layer board. At 600 mA load and 3.6 V input, typical power dissipation is ~180 mW, resulting in ~31°C junction-to-ambient rise - well within the –40°C to +125°C operating range when properly laid out with thermal vias.
Can LM3671MF-2.8/NOPB operate with a 2.5 V input supply?
No. The LM3671MF-2.8/NOPB has a minimum input voltage of 2.7 V per absolute maximum and recommended operating conditions. At 2.5 V, the internal undervoltage lockout (UVLO) disables switching, and the device remains in shutdown. Operation requires VIN ≥ 2.7 V to ensure regulation and protection circuit functionality.
How does the soft-start function work on LM3671MF-2.8/NOPB?
The LM3671MF-2.8/NOPB implements internal soft start by ramping the switch current limit in four discrete steps (70 mA → 140 mA → 280 mA → 1020 mA) during EN assertion after VIN reaches 2.7 V. This limits inrush current into the output capacitor, preventing input rail sag and ensuring controlled voltage ramp-up - typical start-up time is 275–400 µs depending on COUT and load.
LM3671MF-2.8/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):
- 2.8V
- 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-2.8/NOPB FAQ
1.How can I place an order for LM3671MF-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-2.8/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-2.8/NOPB reliable?
The price and inventory of LM3671MF-2.8/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-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-2.8/NOPB?
LM3671MF-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-2.8/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-2.8/NOPB?
For technical support, including LM3671MF-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-2.8/NOPB requirements.
6.How does Aetrix verify that LM3671MF-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-2.8/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-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-2.8/NOPB?
All LM3671MF-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-2.8/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-2.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671MF-2.8/NOPB Tags
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