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Texas Instruments LM3674MF-2.8
- Part No.:
- LM3674MF-2.8
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3674MF-2.8.pdf
- Description:
- IC REG BUCK 2.8V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,652
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Product details
Overview
LM3674MF-2.8 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 datasheet, LM3674MF-2.8 pinout, LM3674MF-2.8 application, or LM3674MF-2.8 equivalent, key selection criteria include its fixed 2.8 V output, SOT-23-5 package compatibility, 2-MHz switching frequency enabling small external components (2.2 µH inductor, 4.7 µF CIN, 10 µF COUT), and integrated synchronous rectification for >90% efficiency at mid-load in battery-powered systems.
Technical Context
The LM3674MF-2.8 uses voltage-mode PWM control with input voltage feed-forward to achieve tight line and load regulation. Its internal 0.5 V reference feeds an error amplifier that modulates PFET on-time to maintain regulated 2.8 V output across 2.7–5.5 V input and 0–600 mA load.
It integrates complementary PFET/NFET synchronous switches (RDSON(P) = 500 mΩ typ, RDSON(N) = 400 mΩ typ), thermal shutdown, cycle-by-cycle current limiting (1020 mA typ), and undervoltage lockout. Shutdown mode disables switching and reduces quiescent current to 0.01 µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - eliminates external feedback resistors and simplifies layout for stable low-noise rail generation. |
| Max Load Current | 600 mA continuous - supports core logic, RF transceivers, and display drivers in handheld devices without external boost stages. |
| Switching Frequency | 2 MHz typical - enables use of tiny 2.2 µH shielded inductors and 0805 ceramic capacitors, reducing board area by >40% vs 500-kHz converters. |
| Input Voltage Range | 2.7 V to 5.5 V - fully compatible with single-cell Li-Ion (2.8–4.2 V) and USB-powered 3.3/5 V rails without intermediate regulation. |
| Shutdown Current | 0.01 µA typical - extends battery life during system sleep modes in always-on sensors and standby peripherals. |
| Feedback Reference | 0.5 V internal - sets precise output via factory-trimmed resistor divider; ensures 2.8 V accuracy without external calibration. |
| Thermal Protection | 125°C junction shutdown - prevents damage during sustained overload or poor PCB thermal design in sealed enclosures. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5 V supply; requires local 4.7 µF X5R ceramic capacitor placed <1 mm from pin to suppress high-frequency switching noise. |
| GND (Pin 2) | Power ground | Primary return path for PFET/NFET switching currents; must connect to solid ground plane under IC to minimize EMI and thermal resistance. |
| EN (Pin 3) | Digital enable | Active-high logic control: >1 V enables regulation; <0.4 V forces 0.01 µA shutdown; floating state is undefined and must be avoided. |
| FB (Pin 4) | Feedback input | Internally connected to fixed 2.8 V divider; not user-accessible - ties directly to output capacitor for closed-loop stability without external components. |
| SW (Pin 5) | Switching node | Drives external 2.2 µH inductor; carries high di/dt square wave (0–VIN); requires short, wide trace to minimize ringing and EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode - reduces conduction loss by >30% vs asynchronous designs, enabling >92% peak efficiency at 300 mA. |
| 2-MHz fixed-frequency PWM | Enables full regulation with only three passive components (2.2 µH L, 4.7 µF CIN, 10 µF COUT) - cuts BOM count and footprint vs lower-frequency alternatives. |
| Integrated soft-start | Ramps output voltage over ~350 µs (with 10 µF COUT, 300 mA load) - prevents inrush current damage to input source and downstream LDOs. |
| Current limit & thermal protection | 1020 mA peak switch current limit + 125°C thermal shutdown - protects IC and inductor during short-circuit or overheating without external circuitry. |
| Ultra-low shutdown current | 0.01 µA typical - draws less than 1 nA per hour from a 3.7 V Li-Ion cell, extending shelf life and standby time in IoT edge nodes. |
Applications
| Mobile Phone Core Rail | Wi-Fi/Bluetooth SoC Power |
|---|---|
|
Use Scenario: Powers application processor I/O and memory interface rails in slim smartphones using single Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 2.8 V at up to 600 mA with fast transient response to CPU burst loads. Use Value: 2-MHz switching avoids AM radio band interference; synchronous topology sustains >90% efficiency across 10–600 mA load range, minimizing thermal stress in sealed chassis. |
Use Scenario: Supplies 2.8 V to dual-band Wi-Fi/BT combo chip in portable hotspot or wireless earbud charging case. IC Role / Device Role / Timing Role: Always-on power stage enabling rapid wake-from-sleep (<10 µs start-up) and seamless RF link reconnection. Use Value: 0.01 µA shutdown current preserves battery charge during multi-day idle periods; small SOT-23-5 footprint fits tight RF module layouts. |
| Portable Medical Sensor | Digital Still Camera ISP |
|
Use Scenario: Powers ultra-low-power ECG/PPG analog front-end and BLE transmitter in wearable health monitor. IC Role / Device Role / Timing Role: Stable 2.8 V supply for precision ADCs and low-noise op-amps, with minimal ripple-induced measurement error. Use Value: Internal 0.5 V reference and tight ±4% output tolerance ensure consistent sensor biasing; low EMI design prevents signal corruption in analog signal chain. |
Use Scenario: Provides 2.8 V to image signal processor (ISP) and auto-focus motor driver in compact digital camera modules. IC Role / Device Role / Timing Role: High-current buck stage supporting ISP burst processing (up to 500 mA) and motor actuation pulses without brownout. Use Value: 600 mA capability and thermal shutdown prevent ISP reset during extended video capture; 2.2 µH inductor allows mechanical clearance for lens actuator. |
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 | 2.8 V fixed, 600 mA, 3-MHz switching, 0.02 µA shutdown - higher frequency enables smaller inductor but tighter layout constraints. | Requires 1.5 µH inductor and 2.2 µF CIN/COUT; better suited for ultra-thin wearables where board area is more critical than layout simplicity. | Select when minimum footprint is priority and 3-MHz EMI can be managed; not drop-in due to different pinout (EN/FB swapped). |
| AP3012KTR-G1 | 2.8 V fixed, 500 mA, 1.5-MHz switching, 1 µA shutdown - lower current rating and higher quiescent current limit device use in longer battery-life applications. | Limited to 500 mA loads; requires larger 4.7 µH inductor and higher ESR capacitors, increasing solution size and cost. | Choose for cost-sensitive industrial sensors where 500 mA suffices and 1 µA shutdown is acceptable; verify thermal margin at full load. |
Compared with TPS62231DRYR and AP3012KTR-G1, the LM3674MF-2.8 offers the best balance of 600 mA capability, 0.01 µA shutdown, and proven 2-MHz layout simplicity - making it optimal for production-ready mobile designs requiring reliability and minimal validation effort.
Availability
LM3674MF-2.8 is available at Aetrix Electronics and suitable for mobile phones, portable medical sensors, Wi-Fi/BT modules, and digital still cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM3674MF-2.8 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 LM3674 product line delivers highly integrated, low-quiescent-current DC-DC converters specifically engineered for space- and battery-constrained portable electronics - emphasizing small footprint, high efficiency, and robust protection features.
FAQ
What is the recommended input and output capacitor configuration for LM3674MF-2.8?
The LM3674MF-2.8 requires a 4.7 µF X5R/X7R ceramic capacitor (6.3 V rating) placed within 1 mm of the VIN pin, and a 10 µF X5R/X7R ceramic capacitor (6.3 V rating) connected directly between VOUT and GND. These values are validated for stable operation across 0–600 mA load and 2.7–5.5 V input; using Y5V dielectrics or undersized capacitors risks instability and excessive output ripple. The LM3674MF-2.8 datasheet specifies these as minimum values for reliable performance.
Does LM3674MF-2.8 support adjustable output voltage?
No, LM3674MF-2.8 is a fixed-output variant with factory-trimmed internal feedback divider set to 2.8 V. It does not expose the FB pin for external resistor programming - unlike the LM3674-ADJ version. Attempting to modify the output voltage by altering external components will not work, as the FB pin is internally hardwired. For adjustable outputs, TI recommends the LM3674-ADJ or LM3674MF-ADJ variants instead of LM3674MF-2.8.
What is the thermal performance of LM3674MF-2.8 on a standard 2-layer PCB?
On a standard 2-layer PCB with 1 oz copper, the LM3674MF-2.8 has a junction-to-ambient thermal resistance (RθJA) of 250°C/W. At 600 mA load and 3.6 V input, power dissipation is ~360 mW, resulting in a ~90°C junction rise above ambient. Derating is required above 60°C ambient; TI specifies 260 mW maximum power at 60°C ambient. Proper thermal vias under the GND pad and copper pour significantly improve this performance for LM3674MF-2.8.
Can LM3674MF-2.8 operate with input voltage below 2.7 V?
No - the LM3674MF-2.8 has a guaranteed minimum operating input voltage of 2.7 V per TI's Recommended Operating Conditions. Below this, undervoltage lockout (UVLO) disables regulation, and output voltage drops unpredictably. While some units may briefly function down to ~2.5 V, TI does not characterize or guarantee performance there. For sub-2.7 V operation, consider TI's TPS6274x series or other ultra-low-VIN buck converters instead of LM3674MF-2.8.
How does the soft-start function work in LM3674MF-2.8?
The LM3674MF-2.8 implements hardware-based soft-start by progressively increasing the internal current limit during startup: 70 mA → 140 mA → 280 mA → 1020 mA (typical), preventing inrush current spikes into the output capacitor. This occurs automatically when EN transitions high after VIN exceeds 2.7 V. With a 10 µF output capacitor and 300 mA load, typical startup time is 350 µs. No external components are needed - the soft-start behavior is intrinsic to the LM3674MF-2.8 silicon design.
LM3674MF-2.8 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):
- 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 FAQ
1.How can I place an order for LM3674MF-2.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3674MF-2.8 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 reliable?
The price and inventory of LM3674MF-2.8 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 is usually 5 days.
3.What payment methods are accepted for LM3674MF-2.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3674MF-2.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3674MF-2.8?
LM3674MF-2.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3674MF-2.8 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?
For technical support, including LM3674MF-2.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3674MF-2.8 requirements.
6.How does Aetrix verify that LM3674MF-2.8 is sourced from the original manufacturer or authorized distributors?
All LM3674MF-2.8 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 meets industry standards.
7.What is the process for return or replacement of LM3674MF-2.8?
All LM3674MF-2.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM3674MF-2.8, 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 part is unused and in its original packaging.
Return procedure for LM3674MF-2.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3674MF-2.8 Tags
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TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
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TPS561201DDCR
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MC33063ADR
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TPS560200DBVR
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AP3012KTR-G1
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TLV61048DBVR
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AZ34063UMTR-G1
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MC34063EBD-TR
STMicroelectronics
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