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Texas Instruments LM3674MF-2.8/NOPB
- Part No.:
- LM3674MF-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3674MF-2.8/NOPB.pdf
- Description:
- IC REG BUCK 2.8V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:983
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Product details
Overview
LM3674MF-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 up to 600 mA load current, features 2-MHz fixed-frequency PWM operation, internal soft-start, and 0.01 µA shutdown current - enabling compact, high-efficiency power delivery in space-constrained mobile phones and PDAs.
For engineers reviewing the LM3674MF-2.8/NOPB datasheet, LM3674MF-2.8/NOPB pinout, LM3674MF-2.8/NOPB application, or LM3674MF-2.8/NOPB equivalent, key selection considerations include its SOT-23-5 package footprint, 0.5 V internal reference voltage, 380 mΩ PFET RDS(ON), thermal/overcurrent protection, and compatibility with only three external components (2.2 µH inductor, 4.7 µF CIN, 10 µF COUT).
Technical Context
The LM3674MF-2.8/NOPB implements voltage-mode PWM control with input voltage feed-forward to maintain stable regulation across line and load variations. Its internal 0.5 V reference feeds an error amplifier that compares FB voltage against VREF, modulating PFET on-time to regulate output.
It integrates complementary PFET/NFET synchronous rectification (RDS(ON) = 380 mΩ / 250 mΩ typ), enabling >90% efficiency at 300 mA with 2.2 µH inductor and ceramic capacitors. Protection includes cycle-by-cycle current limiting (1020 mA typ), thermal shutdown, undervoltage lockout, and soft-start with stepped current limit (70–1020 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| 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) without dropout. |
| Output Voltage | Fixed 2.8 V ±4% - set internally; no external feedback resistors required. |
| Max Load Current | 600 mA - sustained output capability over full temperature and input range with proper thermal layout. |
| Switching Frequency | 2 MHz (typical) - enables use of small 2.2 µH shielded inductors and low-ESR ceramic capacitors. |
| Shutdown Current | 0.01 µA (typical) - minimizes battery drain during system sleep modes. |
| Feedback Reference | 0.5 V internal - defines regulation point; FB pin must be connected directly to VOUT for fixed versions. |
| PFET RDS(ON) | 380 mΩ (typical at 200 mA) - determines conduction loss and thermal rise under load. |
Pinout & Package
LM3674MF-2.8/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed pad for thermal enhancement (RθJA = 130°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Connects to input filter capacitor (4.7 µF ceramic); must be ≥2.7 V for enable and regulation. |
| GND (Pin 2) | Ground reference | Primary return path for input, output, and internal circuitry; requires low-impedance PCB plane connection. |
| EN (Pin 3) | Enable control | Logic-high (>1 V) enables operation; <0.4 V forces shutdown (0.01 µA IQ); must not float. |
| FB (Pin 4) | Feedback sense | Internally tied to 2.8 V output divider; connect directly to VOUT node - no external resistors needed. |
| SW (Pin 5) | Switching node | Drives external inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PFET/NFET reduces conduction loss vs. diode-based buck, improving efficiency by ~10% at light loads. |
| Internal soft-start | Staged current limit (70 → 140 → 280 → 1020 mA) prevents inrush into output capacitance during startup. |
| Thermal & overload protection | Auto-recovery thermal shutdown and cycle-by-cycle current limiting prevent damage during fault conditions. |
| Low-noise 2-MHz operation | Switching frequency above AM radio band avoids interference; enables smaller magnetics and faster transient response. |
| Minimal BOM requirement | Only three external components needed: 2.2 µH inductor, 4.7 µF input cap, 10 µF output cap - reduces board area and cost. |
Applications
| Mobile Phone Power Rail | PDA Core Voltage Supply |
|---|---|
Use Scenario: Powers application processor I/O or display interface in slim smartphone designs using single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 2.8 V rail from 3.0–4.2 V battery input. Use Value: 2-MHz switching allows ultra-compact 2.2 µH inductor placement near SoC; 0.01 µA shutdown extends standby time. | Use Scenario: Supplies core logic voltage for handheld PDA with intermittent high-current bursts during touchscreen or Wi-Fi activity. IC Role / Device Role / Timing Role: High-efficiency buck converter maintaining 2.8 V under dynamic 10–600 mA load steps. Use Value: Synchronous rectification and 380 mΩ PFET RDS(ON) sustain >88% efficiency at 300 mA, minimizing thermal stress in sealed enclosure. |
| MP3 Player Audio Codec Bias | Digital Still Camera Sensor Interface |
Use Scenario: Provides clean, low-noise 2.8 V supply to audio DAC and headphone amplifier in portable music players. IC Role / Device Role / Timing Role: Fixed-output DC-DC regulator with low output ripple (<25 mVpp) for analog signal chain integrity. Use Value: Ceramic capacitor filtering (4.7 µF CIN, 10 µF COUT) combined with 2-MHz operation suppresses switching noise in audio band. | Use Scenario: Powers CMOS image sensor interface circuitry requiring precise 2.8 V with fast transient response during frame capture. IC Role / Device Role / Timing Role: Fast-response buck regulator supporting 100 mA load steps within 10 µs without overshoot. Use Value: Internal soft-start and voltage-mode control ensure stable startup; 2.2 µH inductor enables <5 µs load-step recovery per Figure 15. |
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 | 2.25 V to 5.5 V input; 2.8 V fixed output; 600 mA; 3-MHz switching; 2.5 µA quiescent current. | Higher switching frequency enables smaller inductor but increases EMI sensitivity; higher IQ reduces battery life in deep-sleep systems. | Preferred when board space is critical and EMI filtering can be added; not drop-in due to different EN polarity and pinout. |
| AP3418W6-7 | 2.5 V to 5.5 V input; 2.8 V fixed output; 600 mA; 1.5-MHz switching; 1 µA shutdown current. | Lower switching frequency requires larger inductor (≥3.3 µH); slightly lower efficiency at 200–400 mA due to higher RDS(ON). | Valid alternative where cost is prioritized over size; requires PCB layout revision for pin compatibility. |
Compared with LM3674MF-2.8/NOPB, TPS62231DRYR offers higher frequency and tighter load regulation but higher quiescent current, while AP3418W6-7 trades frequency for lower cost and marginally better shutdown current - neither is pin-compatible, requiring layout changes and validation of transient response and thermal performance.
Availability
LM3674MF-2.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, PDAs, MP3 players, and digital still cameras requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LM3674MF-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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC-DC conversion for portable electronics.
The LM3674 product line was designed specifically for space-constrained, battery-powered devices requiring minimal external components, low quiescent current, and robust protection - targeting mobile handsets, PDAs, and portable instrumentation.
FAQ
What is the recommended input and output capacitor configuration for LM3674MF-2.8/NOPB?
The LM3674MF-2.8/NOPB requires a 4.7 µF X5R/X7R ceramic capacitor (6.3 V rating) placed adjacent to the VIN pin and a 10 µF X5R/X7R ceramic capacitor (6.3 V rating) connected directly to the VOUT node. These values ensure stable operation, low input ripple, and acceptable output voltage ripple (<25 mVpp) under typical 300 mA loads. Avoid Y5V dielectrics due to DC bias degradation.
Does LM3674MF-2.8/NOPB require external feedback resistors to set the output voltage?
No. The LM3674MF-2.8/NOPB is a fixed-output variant with internal resistor divider configured for 2.8 V. The FB pin must be connected directly to the VOUT node - no external resistors are used or permitted. Using external resistors would disrupt regulation and may cause instability or overvoltage.
What thermal derating applies to LM3674MF-2.8/NOPB at 85°C ambient temperature?
On a standard 4-layer PCB, the LM3674MF-2.8/NOPB has a junction-to-ambient thermal resistance (RθJA) of 130°C/W. At 85°C ambient, maximum allowable power dissipation drops to 310 mW (per datasheet Table 6.5), limiting continuous 600 mA operation unless board copper area and airflow are enhanced. Derate output current accordingly to maintain TJ ≤125°C.
Can LM3674MF-2.8/NOPB operate with a 2.5 V input voltage?
No. The LM3674MF-2.8/NOPB has a minimum recommended input voltage of 2.7 V per datasheet Section 6.3. At 2.5 V, the device will not enable (EN threshold is 1 V, but UVLO engages below 2.7 V), and regulation cannot be maintained. Operation below 2.7 V risks unregulated output or shutdown.
How does the soft-start function behave during power-up of LM3674MF-2.8/NOPB?
The LM3674MF-2.8/NOPB implements hardware soft-start by progressively increasing the switch current limit from 70 mA to 1020 mA in discrete steps upon EN assertion, provided VIN ≥2.7 V. This limits inrush current into the 10 µF output capacitor, resulting in controlled VOUT ramp-up - typical start-up time is 240–350 µs depending on load, preventing system reset or brownout.
LM3674MF-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:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3674MF-2.8/NOPB FAQ
1.How can I place an order for LM3674MF-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3674MF-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 LM3674MF-2.8/NOPB reliable?
The price and inventory of LM3674MF-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 LM3674MF-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3674MF-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3674MF-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3674MF-2.8/NOPB?
LM3674MF-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3674MF-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 LM3674MF-2.8/NOPB?
For technical support, including LM3674MF-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3674MF-2.8/NOPB requirements.
6.How does Aetrix verify that LM3674MF-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3674MF-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 LM3674MF-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3674MF-2.8/NOPB?
All LM3674MF-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3674MF-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 LM3674MF-2.8/NOPB part is unused and in its original packaging.
Return procedure for LM3674MF-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3674MF-2.8/NOPB Tags
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