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Texas Instruments LM3671MF-1.375
- Part No.:
- LM3671MF-1.375
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.375.pdf
- Description:
- IC REG BUCK 1.375V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
LM3671MF-1.375 from Texas Instruments is a fixed-output 1.375 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 16 µA typical quiescent current in PFM mode, features 2 MHz fixed-frequency PWM operation, and requires only three external components: one 2.2 µH inductor and two ceramic capacitors. It powers core logic rails in mobile phones and digital still cameras.
For engineers reviewing the LM3671MF-1.375 datasheet, LM3671MF-1.375 pinout, LM3671MF-1.375 application, or LM3671MF-1.375 equivalent, key selection criteria include its 1.375 V fixed output, SOT-23-5 package footprint, 0.01 µA shutdown current, automatic PFM/PWM mode switching, and internal synchronous rectification enabling high efficiency at low output voltages.
Technical Context
The LM3671MF-1.375 uses voltage-mode control with input voltage feed-forward to maintain stable regulation across 2.7–5.5 V input. Its internal 0.5 V reference feeds a feedback amplifier that compares against the fixed resistor-divided output, enabling precise 1.375 V regulation (±4% over temperature).
It integrates a PFET high-side switch (380 mΩ typical RDS(ON)) and NFET synchronous rectifier (250 mΩ typical RDS(ON)), supporting peak current limiting at 1020 mA and thermal shutdown at 150°C. Mode transitions-PWM (>~100 mA at VIN=3.6 V), PFM (light load), and shutdown (<0.4 V on EN)-are fully autonomous and require no external control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.375 V ±4% - enables direct powering of 1.35–1.4 V core logic without external feedback resistors. |
| Max Output Current | 600 mA continuous - supports baseband processors and camera ISPs in compact handheld devices. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (2.7–4.2 V) and regulated 3.3 V/5 V rails. |
| Switching Frequency | 2 MHz typical - allows use of small 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for space-constrained layouts. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime during standby and light-load operation in portable systems. |
| Shutdown Current | 0.01 µA typical - minimizes leakage when system is powered off, critical for always-on sensor nodes. |
| Feedback Reference | 0.5 V internal bandgap - provides stable regulation point for fixed-output variants; eliminates external divider errors. |
Pinout & Package
SOT-23-5 package (DBV, 2.92 mm × 2.84 mm × 1.2 mm) with exposed pad for thermal performance. Pinout matches standard LM3671 fixed-output variants and is not interchangeable with adjustable or DSBGA/USON versions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; must be ≥2.7 V before enabling. |
| 2 GND | Power ground | Main return path for input/output currents; ties to PCB ground plane for EMI and thermal management. |
| 3 EN | Enable control | Active-high logic input; device enabled at >1.0 V, shutdown at <0.4 V; must not float. |
| 4 FB | Feedback sense | Internally connected to fixed 1.375 V divider; connects directly to output capacitor for regulation. |
| 5 SW | Switch node | Drives external inductor; carries high di/dt switching current; requires tight layout and ground stitching. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Reduces conduction loss vs. Schottky diode; enables >90% efficiency at 300 mA with 3.6 V input → 1.375 V output. |
| Automatic PFM/PWM mode switching | Eliminates need for external mode control; maintains >85% efficiency from 1 mA to 600 mA load range. |
| Integrated soft-start | Staged current limit (70/140/280/1020 mA) prevents inrush into large output caps; startup time ~275–400 µs. |
| Thermal & overload protection | Auto-recovering shutdown at 150°C junction; cycle-by-cycle current limit protects inductor and MOSFETs under short-circuit. |
| Ultra-low shutdown current | 0.01 µA typical ensures negligible battery drain during system sleep, meeting stringent portable standby requirements. |
Applications
| Mobile Phone Baseband Power | Digital Still Camera ISP Core Rail |
|---|---|
Use Scenario: Powers ARM-based baseband processor core requiring stable 1.375 V at up to 500 mA during call processing and data transmission. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage; operates in PWM mode during active use and PFM during idle screen states. Use Value: Enables 2 MHz switching to shrink passive size while maintaining >92% efficiency at 400 mA, reducing PCB area by 30% vs. lower-frequency alternatives. |
Use Scenario: Supplies image signal processor (ISP) core in compact digital cameras operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing clean, low-noise 1.375 V rail; enters PFM mode between image captures to conserve battery. Use Value: 16 µA quiescent current extends capture-ready standby time to >72 hours; internal soft-start prevents voltage droop during rapid wake-up. |
| Portable Audio Codec Bias | W-LAN Baseband IC Supply |
Use Scenario: Generates 1.375 V bias for high-fidelity audio codec in Bluetooth headphones with 300 mAh Li-Poly battery. IC Role / Device Role / Timing Role: Secondary power rail generator; enabled only during audio playback via host MCU GPIO. Use Value: 0.01 µA shutdown current prevents battery depletion during weeks of storage; SOT-23-5 footprint fits ultra-thin form factors. |
Use Scenario: Powers WLAN baseband IC in handheld hotspot devices requiring fast transient response to burst data traffic. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting dynamic load steps from 5 mA (idle) to 450 mA (TX burst). Use Value: Automatic PWM-to-PFM transition at ~100 mA load ensures consistent 1.375 V output with <15 mV droop during 100 µs load steps. |
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 | 1.375 V fixed output, 600 mA, 3 MHz switching, 17 µA IQ, SOT-563 (6-pin) | Higher frequency enables smaller inductor (1 µH); requires different PCB layout due to 6-pin package and separate PGND/SIGNAGND pins. | Select for designs prioritizing minimal BOM size and higher-frequency noise filtering; verify thermal derating in 6-pin SOT-563. |
| AP3012KTR-G1 | 1.35 V fixed output (not 1.375 V), 500 mA, 1.5 MHz, 25 µA IQ, SOT-23-5 | 0.025 V output offset and 100 mA lower current limit; lacks PFM mode and synchronous rectification. | Acceptable only if 1.35 V tolerance is sufficient and efficiency above 85% at 400 mA is not required; verify dropout under worst-case load. |
Compared with LM3671MF-1.375, TPS62231DRYR offers higher switching frequency but demands revised layout and thermal validation, while AP3012KTR-G1 sacrifices output accuracy, current capability, and light-load efficiency-making LM3671MF-1.375 the optimal choice for precision 1.375 V, high-efficiency portable power.
Availability
LM3671MF-1.375 is available at Aetrix Electronics and suitable for mobile phone baseband power, digital still camera ISP rails, portable audio codec bias, and W-LAN baseband IC supply requiring stable component supply across production lifecycles.
Supply support for LM3671MF-1.375 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 LM3671 product line delivers highly integrated, low-quiescent-current buck converters for space- and battery-constrained portable electronics, emphasizing minimal external component count and autonomous mode optimization.
FAQ
What is the exact output voltage tolerance of the LM3671MF-1.375 across temperature and load?
The LM3671MF-1.375 delivers 1.375 V with ±4% tolerance over the full operating junction temperature range (−40°C to +125°C) and load current (0–600 mA), as specified in the Electrical Characteristics table for the MF SOT-23 package. This tolerance includes line, load, and temperature effects and is guaranteed without external trimming.
Can the LM3671MF-1.375 operate from a 2.5 V input source?
No. The LM3671MF-1.375 has a minimum input voltage of 2.7 V per its Operating Ratings. At inputs below 2.7 V, undervoltage lockout disables operation to prevent unstable regulation or excessive dropout. For 2.5 V input systems, consider a buck-boost or LDO alternative.
Does the LM3671MF-1.375 require an external feedback resistor network?
No. The LM3671MF-1.375 is a fixed-output variant with internal resistor dividers configured for 1.375 V. The FB pin connects directly to the output capacitor; adding external resistors would disrupt regulation and is not supported.
What is the recommended inductor value and type for the LM3671MF-1.375?
Texas Instruments specifies a 2.2 µH shielded power inductor with ≥600 mA saturation current and ≤150 mΩ DC resistance (e.g., Coilcraft XAL5030-222MEB). This value enables stable 2 MHz operation, optimal efficiency, and minimal output ripple as validated in the Typical Application Circuit (Figure 1).
How does the LM3671MF-1.375 handle short-circuit conditions on its output?
The LM3671MF-1.375 employs cycle-by-cycle current limiting (1020 mA typical) and thermal shutdown (150°C typical). Under sustained short-circuit, it enters timed current limit mode-extending NFET on-time to allow inductor current decay-then cycles into thermal shutdown if junction temperature exceeds limits, protecting both the IC and external components.
LM3671MF-1.375 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):
- 1.375V
- Voltage - Output (Max):
- -
- 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-1.375 FAQ
1.How can I place an order for LM3671MF-1.375 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.375 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-1.375 reliable?
The price and inventory of LM3671MF-1.375 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-1.375 is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.375?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.375 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.375?
LM3671MF-1.375 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.375 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-1.375?
For technical support, including LM3671MF-1.375 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.375 requirements.
6.How does Aetrix verify that LM3671MF-1.375 is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.375 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-1.375 meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.375?
All LM3671MF-1.375 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.375, 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-1.375 part is unused and in its original packaging.
Return procedure for LM3671MF-1.375:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671MF-1.375 Tags
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