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Texas Instruments LM3674MF-1.8/NOPB
- Part No.:
- LM3674MF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3674MF-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
LM3674MF-1.8/NOPB from Texas Instruments is a fixed-output 1.8 V, 600-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered systems (2.7–5.5 V input). It operates at 2 MHz (typical), integrates PFET/NFET switches with 380 mΩ/250 mΩ RDS(ON), and delivers regulated power to core logic in mobile phones and portable instruments.
For engineers reviewing the LM3674MF-1.8/NOPB datasheet, LM3674MF-1.8/NOPB pinout, LM3674MF-1.8/NOPB application, or LM3674MF-1.8/NOPB equivalent, key selection criteria include its 2-MHz switching frequency enabling compact 2.2 µH inductor + 10 µF ceramic output capacitor design, 0.01 µA shutdown current, internal soft-start, and thermal/current protection - all in a 5-pin SOT-23 package.
Technical Context
The LM3674MF-1.8/NOPB uses voltage-mode PWM control with input voltage feed-forward to achieve tight line regulation (0.083 %/V) and load regulation (0.0010 %/mA). Its internal 0.5 V reference and fixed feedback network eliminate external resistors, simplifying layout for 1.8 V output.
During operation, the integrated PFET switch (RDS(ON) = 380 mΩ typ) conducts during on-time while the NFET synchronous rectifier (RDS(ON) = 250 mΩ typ) replaces a lossy diode, enabling >90% efficiency at 300 mA with 2.2 µH inductor and 10 µF COUT. Shutdown mode disables switching and reduces quiescent current to 0.01 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - eliminates need for external feedback resistors and ensures stable core supply for low-voltage ASICs/FPGAs. |
| Max Load Current | 600 mA - supports high-current digital subsystems such as baseband processors and memory interfaces. |
| Switching Frequency | 2 MHz (typical) - enables use of small 2.2 µH shielded inductors and 10 µF ceramic output 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 (3.0–4.2 V) and USB-powered (5 V) portable systems. |
| Shutdown Current | 0.01 µA (typical) - extends battery life in standby modes without requiring external load switches. |
| Internal Reference | 0.5 V - sets precise feedback threshold for fixed-output variants, ensuring consistent regulation across temperature (−30°C to 125°C). |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit (1020 mA typ) - prevents damage during short-circuit or overload events without external circuitry. |
Pinout & Package
SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 5-pin surface-mount footprint with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5 V supply; requires local 4.7 µF ceramic decoupling capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| GND (Pin 2) | Ground reference | Primary return path for input/output currents and IC substrate; must connect directly to low-impedance ground plane under device. |
| EN (Pin 3) | Enable control | Digital input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; internal pull-down ensures default-off state if left unconnected. |
| FB (Pin 4) | Feedback node | Internally connected to fixed resistor divider for 1.8 V output; no external components required - simplifies BOM and layout. |
| 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 EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction losses and improving full-load efficiency by up to 12% vs asynchronous designs. |
| Internal Soft-Start | Ramps output voltage over ~350 µs (with 10 µF COUT, 300 mA load), preventing inrush current that could destabilize input rails or trigger upstream overcurrent protection. |
| 2-MHz Fixed-Frequency PWM | Enables use of miniature 2.2 µH inductors (e.g., Coilcraft DO3314-222MX) and avoids audible noise, critical for consumer audio-sensitive applications. |
| Thermal & Overcurrent Protection | Auto-recovery shutdown triggers at 125°C junction temperature or 1020 mA peak switch current, protecting both IC and external components during fault conditions. |
| Low-RDS(ON) Power Switches | 380 mΩ (PFET) + 250 mΩ (NFET) minimizes conduction loss at 600 mA, maintaining >88% efficiency even at 2.7 V input / 1.8 V output. |
Applications
| Mobile Phone Core Supply | Portable Instrument MCU Rail |
|---|---|
Use Scenario: Powers ARM Cortex-A/M series application processors and DDR memory I/O banks in slim smartphones operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.8 V buck regulator delivering clean, regulated voltage with fast transient response to handle burst-mode CPU activity. Use Value: 2-MHz switching enables compact 2.2 µH + 10 µF output filter, reducing solution size by 35% versus 500-kHz alternatives while maintaining <25 mV output ripple. | Use Scenario: Supplies 1.8 V to microcontrollers and precision ADCs in handheld test equipment powered by rechargeable Li-Poly batteries. IC Role / Device Role / Timing Role: Main system rail regulator with thermal protection to sustain continuous operation during extended field measurements. Use Value: 0.01 µA shutdown current extends battery runtime in sleep mode; internal soft-start prevents brownout during wake-up sequences. |
| MP3 Player DSP Core | W-LAN Module Interface |
Use Scenario: Provides stable 1.8 V supply to digital signal processors and audio codecs in battery-operated portable media players. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting dynamic voltage scaling during variable-bitrate playback. Use Value: Synchronous rectification achieves >91% efficiency at 400 mA, minimizing heat buildup in sealed plastic enclosures. | Use Scenario: Generates 1.8 V for WLAN chipset I/O and RF front-end biasing in compact IoT gateways using USB or battery power. IC Role / Device Role / Timing Role: Compact, low-noise power stage meeting EMI limits for wireless coexistence in dense PCB layouts. Use Value: 2-MHz operation shifts switching harmonics above 100 MHz, easing filtering requirements and reducing conducted emissions into 2.4 GHz RF bands. |
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 | 1.8 V fixed, 600 mA, 3-MHz switching, 0.02 µA shutdown, but requires external compensation components. | Better light-load efficiency via DCS-Control topology; suited for ultra-low-power sensor nodes with frequent deep-sleep cycles. | Select TPS62231DRVR when >95% efficiency below 10 mA load is critical and board space allows additional 2–3 passive components. |
| AP3012KTR-G1 | 1.8 V fixed, 600 mA, 1.5-MHz switching, 1 µA shutdown, no internal soft-start, larger SOT-23-6 package. | Lower cost alternative with reduced feature set; lacks thermal shutdown and has higher quiescent current. | Choose AP3012KTR-G1 only for cost-sensitive, non-safety-critical consumer devices where 1 µA shutdown is acceptable and thermal margin is ample. |
Compared with TPS62231DRVR and AP3012KTR-G1, the LM3674MF-1.8/NOPB offers the best balance of integration (no external compensation), ultra-low shutdown current (0.01 µA), and robust protection - making it ideal for mainstream portable electronics where reliability and BOM simplicity are prioritized over marginal efficiency gains or lowest unit cost.
Availability
LM3674MF-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable instruments, and W-LAN modules requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for LM3674MF-1.8/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 and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3674 product line was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-noise, and highly integrated DC-DC conversion - targeting mobile handsets, PDAs, and digital cameras.
FAQ
What is the recommended input and output capacitor configuration for LM3674MF-1.8/NOPB?
The LM3674MF-1.8/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) at the VOUT node. These values are validated for stable operation across −30°C to 85°C ambient and ensure <25 mV peak-to-peak output ripple with a 2.2 µH inductor. Larger capacitance improves transient response but is not required for basic functionality.
Does LM3674MF-1.8/NOPB require external feedback resistors?
No, the LM3674MF-1.8/NOPB does not require external feedback resistors. It is a fixed-output variant with an internal resistor divider configured for 1.8 V, referenced to the 0.5 V internal bandgap. The FB pin is internally connected and must not be externally loaded - doing so will disrupt regulation accuracy and stability.
What protection features are integrated into LM3674MF-1.8/NOPB?
The LM3674MF-1.8/NOPB integrates cycle-by-cycle overcurrent protection (1020 mA typical trip point), thermal shutdown (125°C junction limit), undervoltage lockout (2.7 V minimum VIN), and internal soft-start. These functions operate autonomously without external components, ensuring safe startup and fault recovery in portable systems where board space and component count are constrained.
Can LM3674MF-1.8/NOPB operate from a 2.7 V input while delivering 600 mA at 1.8 V?
Yes, the LM3674MF-1.8/NOPB is specified to deliver 600 mA at 1.8 V output with a 2.7 V input across −30°C to 85°C ambient, provided the PCB layout uses a 2.2 µH inductor with ≤200 mΩ DCR and proper thermal relief. Efficiency drops to ~82% at this condition due to increased conduction loss, but regulation remains within ±4% tolerance per datasheet specifications.
Is LM3674MF-1.8/NOPB pin-compatible with other LM3674 variants?
Yes, all LM3674 variants - including LM3674MF-1.2/NOPB, LM3674MF-1.5/NOPB, LM3674MF-1.8/NOPB, LM3674MF-2.5/NOPB, LM3674MF-2.8/NOPB, LM3674MF-3.0/NOPB, LM3674MF-3.3/NOPB, and LM3674MFX-ADJ/NOPB - share identical 5-pin SOT-23 (DBV) pinout and package dimensions. This allows direct substitution in existing layouts when changing output voltage requirements, provided external components (inductor, capacitors) remain compatible.
LM3674MF-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM3674MF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3674MF-1.8/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-1.8/NOPB reliable?
The price and inventory of LM3674MF-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3674MF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3674MF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3674MF-1.8/NOPB?
LM3674MF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3674MF-1.8/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-1.8/NOPB?
For technical support, including LM3674MF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3674MF-1.8/NOPB requirements.
6.How does Aetrix verify that LM3674MF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3674MF-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3674MF-1.8/NOPB?
All LM3674MF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3674MF-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3674MF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3674MF-1.8/NOPB Tags
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TPS561201DDCR
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MC33063ADR
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MC34063EBD-TR
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