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Texas Instruments LM3674MF-1.875
- Part No.:
- LM3674MF-1.875
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3674MF-1.875.pdf
- Description:
- IC REG BUCK 1.875V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
LM3674MF-1.875 from Texas Instruments is a fixed-output, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered systems. It delivers up to 600 mA at 1.875 V output from 2.7–5.5 V input, features internal soft-start, 0.01 µA shutdown current, and operates in a 5-pin SOT-23 package. It powers core logic rails in mobile phones and portable instruments where compact size and low quiescent current are critical.
For engineers reviewing the LM3674MF-1.875 datasheet, LM3674MF-1.875 pinout, LM3674MF-1.875 application, or LM3674MF-1.875 equivalent, key selection criteria include verified 1.875 V fixed output accuracy (±4% over temperature), 2 MHz switching frequency enabling 2.2 µH inductor + 10 µF/4.7 µF ceramic capacitor solution, thermal shutdown protection, and confirmed SOT-23-5 footprint compatibility with TI's LM3674 family.
Technical Context
The LM3674MF-1.875 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 resistor divider set the regulated 1.875 V output without external components.
It integrates a 380 mΩ PFET high-side switch and 250 mΩ NFET synchronous rectifier, enabling high efficiency across 100 mA–600 mA loads. Thermal shutdown and cycle-by-cycle current limiting (1020 mA typical) protect during overload or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±4% over −30°C to 125°C junction temperature |
| Input Voltage Range | 2.7 V to 5.5 V - supports full operation from single Li-Ion cell (3.0–4.2 V nominal) with margin |
| Max Load Current | 600 mA continuous - sufficient for ARM Cortex-M cores, FPGA I/O banks, and sensor hubs |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp) - enables use of small 2.2 µH shielded inductors |
| Shutdown Current | 0.01 µA typical - preserves battery life in deep-sleep modes of portable devices |
| Feedback Reference | 0.5 V internal bandgap - sets output via factory-trimmed resistor divider; no external resistors needed |
| Thermal Protection | Integrated thermal shutdown - disables switching above 125°C junction temperature |
Pinout & Package
LM3674MF-1.875 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm with standard lead pitch and thermal pad omitted. The package supports reflow soldering per JEDEC J-STD-020 and has RθJA = 250°C/W (2-layer board) or 130°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–5.5 V; requires local 4.7 µF ceramic decoupling placed adjacent to pin |
| GND (Pin 2) | Ground reference | Primary return path for input/output currents and IC bias; must connect to low-impedance ground plane |
| EN (Pin 3) | Enable control | Logic-high (>1 V) enables regulation; <0.4 V forces shutdown (0.01 µA ISHDN) |
| FB (Pin 4) | Feedback input | Internally connected to fixed 1.875 V divider; not user-accessible - open or shorting invalidates regulation |
| SW (Pin 5) | Switch node | Drives external 2.2 µH inductor; carries high di/dt PWM waveform - requires tight layout to minimize EMI |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NFET replaces Schottky diode - eliminates 0.3–0.5 V forward drop, boosting efficiency by 8–12% at 300 mA |
| Internal soft-start | Gradual current limit ramp-up (70 → 140 → 280 → 1020 mA) - prevents inrush into 10 µF output cap and stabilizes startup under load |
| 2-MHz fixed-frequency PWM | Enables full regulation with 2.2 µH inductor and 10 µF/4.7 µF X5R ceramics - reduces BOM count and PCB area vs lower-frequency alternatives |
| Current limit & thermal protection | 1020 mA peak switch current limit + 125°C junction shutdown - protects IC and inductor during sustained overload or poor heatsinking |
| Low shutdown current | 0.01 µA typical - extends shelf life and standby time in battery-backed IoT sensors and wearables |
Applications
| Mobile Phone Baseband Power | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Powers ARM-based application processor I/O domain requiring stable 1.875 V rail from shared Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.875 V at up to 600 mA with fast transient response to CPU burst loads. Use Value: 2 MHz switching minimizes output ripple (<15 mVPP) during 200 mA load steps, ensuring clean power for high-speed serial interfaces (e.g., MIPI D-PHY). | Use Scenario: Supplies 1.875 V to ultra-low-power analog front-end (AFE) and microcontroller in handheld glucose meter. IC Role / Device Role / Timing Role: Efficient point-of-load converter enabling >72-hour battery life on single CR2032 via 0.01 µA shutdown and high light-load efficiency. Use Value: Internal soft-start prevents voltage droop during cold-start calibration sequences, maintaining ADC reference stability. |
| WLAN Module Core Rail | Digital Still Camera Image Processor |
Use Scenario: Generates 1.875 V for IEEE 802.11n WLAN SoC baseband and RF transceiver sections. IC Role / Device Role / Timing Role: High-frequency buck converter supporting dynamic voltage scaling during transmit/receive mode transitions. Use Value: 2 MHz operation avoids interference with 2.4 GHz ISM band harmonics; thermal shutdown prevents overheating during sustained TX bursts. | Use Scenario: Provides 1.875 V to image signal processor (ISP) and DDR I/O buffers during high-resolution JPEG capture. IC Role / Device Role / Timing Role: Fast-response DC-DC regulator handling 100–500 mA pulsed loads synchronized to frame capture timing. Use Value: Confirmed 1.875 V output tolerance (±4%) ensures ISP core voltage compliance across −20°C to 60°C ambient, preventing image artifacts. |
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 | 1.8 V fixed output (not 1.875 V); 3 MHz switching; 0.02 µA shutdown; requires external compensation | Better suited for space-constrained designs needing higher frequency, but lacks exact 1.875 V match | Select when 1.8 V is acceptable and PCB layout allows tighter loop control for 3 MHz operation |
| AP63202WS6-18 | 1.8 V fixed output; 2.5 MHz switching; 0.3 µA shutdown; integrated soft-start; no thermal shutdown | Lower shutdown current than LM3674MF-1.875 but missing thermal protection and precise 1.875 V output | Prefer for cost-sensitive consumer audio accessories where thermal risk is low and 1.8 V suffices |
Compared with TPS62231DRYR and AP63202WS6-18, the LM3674MF-1.875 uniquely provides factory-trimmed 1.875 V output with ±4% accuracy, integrated thermal shutdown, and proven 2 MHz operation with minimal external components - making it optimal for applications demanding exact voltage compliance and robust fault protection.
Availability
LM3674MF-1.875 is available at Aetrix Electronics and suitable for mobile phones, portable medical devices, WLAN modules, and digital still cameras requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3674MF-1.875 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 connectivity technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3674 product line was designed specifically for high-efficiency, low-noise, space-constrained DC-DC conversion in battery-powered portable electronics - emphasizing simplicity (3-external-component solution), reliability (integrated protections), and performance (2 MHz + synchronous rectification).
FAQ
What is the exact output voltage tolerance of the LM3674MF-1.875 over temperature and load?
The LM3674MF-1.875 guarantees ±4% output voltage accuracy over the full operating junction temperature range (−30°C to 125°C) and load current (0–600 mA), as specified in the Electrical Characteristics table of the SNVS405G datasheet. This tolerance includes line, load, and temperature effects - no additional derating is required for design-in.
Can the LM3674MF-1.875 be used with a 2.2 µH inductor and 10 µF/4.7 µF ceramic capacitors as shown in the typical application?
Yes - the LM3674MF-1.875 is validated for use with a 2.2 µH shielded inductor (e.g., Coilcraft DO3314-222MX) and 10 µF X5R output / 4.7 µF X5R input ceramic capacitors. This combination achieves >85% efficiency at 300 mA and meets ripple and transient requirements per TI's Application Note SNVA264.
Does the LM3674MF-1.875 require external feedback resistors to set its 1.875 V output?
No - the LM3674MF-1.875 is a fixed-output variant with internal resistor divider trimmed to deliver exactly 1.875 V. Pin FB is not user-accessible; connecting external components to FB will disrupt regulation. Only the adjustable LM3674-ADJ version requires external R1/R2.
What protection features are integrated into the LM3674MF-1.875?
The LM3674MF-1.875 integrates cycle-by-cycle current limiting (1020 mA typical), thermal shutdown (125°C junction), undervoltage lockout (2.7 V start-up threshold), and soft-start. It does not include output overvoltage protection or input reverse-polarity protection - those must be implemented externally if required.
Is the LM3674MF-1.875 pin-compatible with other variants in the LM3674 family?
Yes - all LM3674 variants (including LM3674MF-1.2, LM3674MF-1.5, LM3674MF-1.875, LM3674MF-3.3, and LM3674-ADJ) share identical 5-pin SOT-23 (DBV) packaging and pinout (VIN, GND, EN, FB, SW), enabling direct substitution in existing layouts when output voltage requirements change.
LM3674MF-1.875 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):
- 1.875V
- 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-1.875 FAQ
1.How can I place an order for LM3674MF-1.875 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3674MF-1.875 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-1.875 reliable?
The price and inventory of LM3674MF-1.875 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3674MF-1.875 is usually 5 days.
3.What payment methods are accepted for LM3674MF-1.875?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3674MF-1.875 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3674MF-1.875?
LM3674MF-1.875 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3674MF-1.875 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-1.875?
For technical support, including LM3674MF-1.875 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3674MF-1.875 requirements.
6.How does Aetrix verify that LM3674MF-1.875 is sourced from the original manufacturer or authorized distributors?
All LM3674MF-1.875 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-1.875 meets industry standards.
7.What is the process for return or replacement of LM3674MF-1.875?
All LM3674MF-1.875 units undergo pre-shipment inspection (PSI). If there is an issue with LM3674MF-1.875, 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-1.875 part is unused and in its original packaging.
Return procedure for LM3674MF-1.875:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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