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Texas Instruments LM3671MF-ADJ/NOPB
- Part No.:
- LM3671MF-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3671MF-ADJ/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package, designed for Li-Ion-powered portable systems. It delivers adjustable output voltage from 1.1 V to 3.3 V with 16 µA typical quiescent current, 0.01 µA shutdown current, and internal soft-start - enabling efficient power delivery in mobile phones and handheld medical devices.
For engineers reviewing the LM3671MF-ADJ/NOPB datasheet, LM3671MF-ADJ/NOPB pinout, LM3671MF-ADJ/NOPB application, or LM3671MF-ADJ/NOPB equivalent, key selection considerations include its 2-MHz fixed-frequency PWM/automatic PFM mode switching, internal synchronous rectification, feedback reference of 0.5 V, and requirement for only three external components (inductor + two ceramic capacitors).
Technical Context
The LM3671MF-ADJ/NOPB implements voltage-mode control with input-voltage feed-forward to maintain stable regulation across 2.7 V–5.5 V input range. Its functional block includes an error amplifier comparing FB against 0.5 V reference, PWM oscillator at 2 MHz (typical), and dual MOSFET drivers for PFET high-side switch and NFET synchronous rectifier.
It supports three operational modes: PWM (≥80 mA load), PFM (light-load, 16 µA IQ), and shutdown (0.01 µA). Mode transitions are automatic and based on inductor zero-current detection and peak-switch-current thresholds - no external control required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-Ion and USB-powered systems without pre-regulation. |
| Output Current | Up to 600 mA - sufficient for core logic, RF transceivers, and display bias in portable electronics. |
| Switching Frequency | 2 MHz (typical) - enables use of small 2.2 µH inductors and compact 10 µF/4.7 µF ceramic capacitors. |
| Feedback Reference | 0.5 V - sets output via external resistor divider (VOUT = 0.5 × (1 + R1/R2)), enabling precise ADJ configuration. |
| Quiescent Current | 16 µA (typical) - extends battery life during standby in always-on sensor or communication modules. |
| Shutdown Current | 0.01 µA (typical) - minimizes leakage in deep-sleep states for IoT edge nodes. |
| Internal FET RDS(ON) | PFET: 380–500 mΩ; NFET: 250–400 mΩ - enables >90% efficiency at mid-load with minimal thermal rise in USON package. |
Pinout & Package
LM3671MF-ADJ/NOPB uses a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm (nominal), with wettable flanks for automated optical inspection. Thermal resistance is 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 ≥2.7 V before enabling. |
| 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 | Analog Feedback | Connects to resistor divider output; internal 0.5 V reference regulates VOUT = 0.5 × (1 + R1/R2). |
| SW | Switch Node | Drives external inductor; carries high di/dt switching waveform - requires tight layout and ground stitching. |
| SGND | Signal Ground | Separate ground for FB reference; ties to GND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM-PWM mode switching | Eliminates manual mode control; maintains >85% efficiency from 1 mA to 600 mA load without external circuitry. |
| Internal synchronous rectification | Replaces external Schottky diode; reduces conduction loss and improves full-load efficiency by ~8% vs. asynchronous design. |
| Integrated soft-start | Ramps current limit in 4 steps (70/140/280/1020 mA); prevents inrush into large output caps and stabilizes startup under load. |
| Thermal & current protection | Shuts down at 150°C (typical) and limits peak switch current to 1020 mA (open-loop); recovers automatically after fault clears. |
| Minimal BOM requirement | Only L1 (2.2 µH), CIN (4.7 µF), and COUT (10 µF) needed - accelerates layout and reduces bill-of-materials cost. |
Applications
| Mobile Phone Power Rail | Portable Medical Sensor Supply |
|---|---|
Use Scenario: Powers baseband processor core voltage (1.2–1.8 V) from single Li-Ion cell in slim smartphone designs. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated ADJ output with fast transient response to CPU DVFS events. Use Value: 2-MHz switching avoids AM radio band interference; 16 µA quiescent current extends standby time beyond 7 days. | Use Scenario: Supplies 3.3 V analog front-end and 1.8 V digital logic for handheld ECG monitor with Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete LDO + boost combo; enables compact 35 mm × 25 mm PCB footprint. Use Value: Internal soft-start prevents sensor offset drift during power-up; PFM mode sustains >92% efficiency at 50 µA sensor sleep current. |
| W-LAN Module Bias | Automotive Infotainment Display Backlight |
Use Scenario: Generates 1.5 V supply for Wi-Fi SoC in portable hotspot or wireless router. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PWM mode during data transmission bursts. Use Value: Synchronous rectification achieves 94% peak efficiency at 400 mA, reducing thermal load in sealed plastic enclosure. | Use Scenario: Provides 2.8 V adjustable rail for RGB LED driver IC in automotive center console display. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down 5 V system rail to match LED forward voltage requirements. Use Value: 2.7–5.5 V input range accommodates automotive cold-crank (6.5 V) and load-dump (40 V with external protection); FB pin allows precise dimming control. |
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 | 3-MHz switching frequency; 0.6-V reference; 400-mA max output; 5-pin WSON package. | Limited to lower output current; optimized for ultra-small footprint rather than high-current capability. | Select when board space is constrained and load ≤400 mA; verify FB divider compatibility with 0.6-V reference. |
| AP63205WU-7 | 2.5-MHz operation; 600-mA rating; integrated compensation; 6-pin WDFN package; no SGND pin. | Lacks dedicated signal ground - may require careful layout to match LM3671MF-ADJ/NOPB's noise immunity in sensitive analog rails. | Prefer for simplified design where FB stability is less critical; confirm thermal performance matches USON RθJA in target layout. |
Compared with TPS62231DRYR and AP63205WU-7, the LM3671MF-ADJ/NOPB offers superior light-load efficiency via intelligent PFM entry, dedicated SGND for precision feedback, and proven 600-mA capability in thermally constrained USON packaging - making it optimal for battery-sensitive portable systems requiring both high peak current and long standby life.
Availability
LM3671MF-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical equipment, and W-LAN modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671MF-ADJ/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 ICs, with decades of expertise in high-efficiency DC-DC conversion.
The LM3671 product line targets portable and battery-operated applications demanding ultra-low quiescent current, minimal external components, and robust protection - specifically engineered for space-constrained, energy-sensitive consumer and automotive infotainment systems.
FAQ
What output voltage range does the LM3671MF-ADJ/NOPB support?
The LM3671MF-ADJ/NOPB supports an adjustable output voltage range from 1.1 V to 3.3 V, set by an external resistor divider connected to the FB pin. Its internal 0.5 V reference enables precise configuration using standard 1% resistors, and the datasheet confirms stable operation across this full range with appropriate inductor and capacitor selection for LM3671MF-ADJ/NOPB.
Does the LM3671MF-ADJ/NOPB require an external Schottky diode?
No, the LM3671MF-ADJ/NOPB does not require an external Schottky diode because it integrates synchronous rectification using an internal NFET. This eliminates forward-voltage drop and associated power loss, improving efficiency - especially at low output voltages - and simplifying the bill of materials compared to asynchronous buck converters. The LM3671MF-ADJ/NOPB relies solely on its internal PFET and NFET switches.
How does the LM3671MF-ADJ/NOPB handle thermal overload?
The LM3671MF-ADJ/NOPB incorporates internal thermal shutdown that activates at approximately 150°C junction temperature and releases at 130°C. During overtemperature events, the device halts switching and enters a safe state until cooling occurs. This protection is independent of load current and works in conjunction with current limiting (1020 mA typical peak) to safeguard both LM3671MF-ADJ/NOPB and external components.
Can the LM3671MF-ADJ/NOPB operate from a 2.5-V input?
No, the LM3671MF-ADJ/NOPB has a minimum recommended input voltage of 2.7 V per its absolute maximum and operating conditions tables. Operation below 2.7 V risks undervoltage lockout activation, unstable regulation, or failure to start - even if the absolute maximum rating permits transient excursions down to –0.2 V. For reliable function, LM3671MF-ADJ/NOPB must be supplied within 2.7 V–5.5 V.
What is the purpose of the SGND pin on the LM3671MF-ADJ/NOPB?
SGND (Signal Ground) is a dedicated ground connection for the internal feedback reference and error amplifier, electrically isolated from the main power ground (GND) to prevent noise coupling into the sensitive 0.5 V reference path. Proper layout requires connecting SGND to the system ground plane at a single point near the LM3671MF-ADJ/NOPB to maintain output accuracy and stability - especially critical in the adjustable version.
LM3671MF-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- 3.3V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM3671MF-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM3671MF-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-ADJ/NOPB?
LM3671MF-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-ADJ/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-ADJ/NOPB?
For technical support, including LM3671MF-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3671MF-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-ADJ/NOPB?
All LM3671MF-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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