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Texas Instruments LM3671MF-1.25/NOPB
- Part No.:
- LM3671MF-1.25/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.25/NOPB.pdf
- Description:
- IC REG BUCK 1.25V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,338
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Product details
Overview
LM3671MF-1.25/NOPB from Texas Instruments is a fixed-output 1.25 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 2 MHz fixed-frequency PWM switching with automatic PFM mode transition, and achieves 16 µA typical quiescent current in light-load operation - enabling extended battery life in mobile phones and digital still cameras.
For engineers reviewing the LM3671MF-1.25/NOPB datasheet, LM3671MF-1.25/NOPB pinout, LM3671MF-1.25/NOPB application, or LM3671MF-1.25/NOPB equivalent, key selection criteria include its 1.25 V fixed output accuracy (±4%), internal synchronous rectification, 0.01 µA shutdown current, and USON-6 package compatibility with space-constrained handheld designs.
Technical Context
The LM3671MF-1.25/NOPB implements voltage-mode control with input feed-forward compensation to maintain stable regulation across 2.7–5.5 V input and 0–600 mA load. Its integrated PFET/NFET power stage uses internal 380 mΩ (PFET) and 250 mΩ (NFET) RDS(ON) values, enabling high efficiency without external diodes.
Functional mode transitions are autonomous: PWM mode dominates above ~80 mA load for low-noise, constant-frequency operation; below that threshold, it enters hysteretic PFM mode to reduce IQ to 16 µA typical while maintaining ±0.6% to ±1.7% output voltage ripple around nominal 1.25 V - critical for noise-sensitive RF and audio subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.25 V ±4% over −40°C to +125°C - ensures stable core voltage for low-power microcontrollers and sensors. |
| Max Output Current | 600 mA continuous - supports multiple peripheral rails in compact portable devices without thermal derating at TA ≤ 85°C. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz range) - enables use of 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for minimal board area. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime during standby in always-on wireless modules. |
| Shutdown Current | 0.01 µA typical - eliminates parasitic drain in battery-backed systems requiring multi-year shelf life. |
| Input Voltage Range | 2.7 V to 5.5 V - fully compatible with single-cell Li-ion (3.0–4.2 V), Li-polymer, and regulated 3.3 V/5 V system rails. |
| Feedback Reference | 0.5 V internal bandgap - simplifies design by eliminating external resistor divider for fixed-output variants like LM3671MF-1.25/NOPB. |
Pinout & Package
LM3671MF-1.25/NOPB is housed in a 2.00 mm × 2.00 mm, 6-pin USON (NKH) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 2.7–5.5 V supply; requires local 4.7 µF ceramic capacitor to minimize input ripple and ESR-related losses. |
| GND | Power ground | Primary return path for high-current switching loop; must be connected to low-impedance ground plane adjacent to VIN and SW pins. |
| EN | Digital enable | Active-high logic input; device enabled when >1 V, disabled when <0.4 V; must not float - tie to GND or host GPIO for controlled sequencing. |
| FB | Feedback node | Internally connected to 1.25 V output divider; no external resistors required - direct connection to output capacitor ensures precise regulation. |
| SW | Switching node | Drives external 2.2 µH inductor; carries high di/dt current - requires short, wide trace routing and tight coupling to GND for EMI control. |
| SGND | Signal ground | Separate feedback reference ground; must be tied to main GND at single point near FB pin to avoid noise injection into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by up to 8% vs. asynchronous buck topologies. |
| Auto PFM-PWM mode switching | Maintains >85% efficiency from 1 mA to 600 mA load without manual mode control or external circuitry. |
| Integrated soft-start | Gradually ramps switch current limit (70 → 140 → 280 → 1020 mA) to limit inrush, enabling reliable startup into 10 µF output capacitance. |
| Thermal shutdown protection | Engages at TJ ≈ 150°C and releases at TJ ≈ 130°C - prevents permanent damage during sustained overload or poor heatsinking. |
| Current overload protection | Peak switch current limit of 1020 mA (typical) prevents inductor saturation and MOSFET failure under short-circuit conditions. |
Applications
| Mobile Phone Power Management | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Providing regulated 1.25 V to image sensor analog front-end and ISP core logic in ultra-thin smartphone modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, low-noise DC power with fast transient response to handle burst-mode sensor readout. Use Value: 2 MHz switching avoids interference with cellular RF bands; 16 µA PFM IQ extends standby time between shots without compromising wake-up latency. |
Use Scenario: Powering CMOS image sensor bias and low-voltage logic in compact digital cameras with Li-ion battery input. IC Role / Device Role / Timing Role: Fixed-output step-down converter supplying stable 1.25 V rail with ±4% tolerance for precision analog circuits. Use Value: Internal 0.5 V reference and factory-trimmed FB network ensure output accuracy without calibration; USON-6 footprint saves >30% board area vs. SOT-23 alternatives. |
| Wireless Handheld Terminal | Portable Medical Sensor Node |
Use Scenario: Generating 1.25 V for BLE/Wi-Fi SoC and touch controller in handheld payment terminals operating on single-cell batteries. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting intermittent high-current transmit bursts while minimizing average power draw. Use Value: Automatic PFM-to-PWM transition responds within microseconds to load steps up to 600 mA, preventing brownout during radio transmission. |
Use Scenario: Supplying regulated 1.25 V to ultra-low-power biosensor signal chain (ADC, op-amps, microcontroller) in wearable health monitors. IC Role / Device Role / Timing Role: Low-quiescent buck converter enabling multi-week battery life in sleep-dominated operation profiles. Use Value: 0.01 µA shutdown current preserves battery capacity during storage; thermal shutdown protects against skin-contact overheating in enclosed housings. |
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 | 1.25 V fixed output, 600 mA, 3 MHz switching, 19 µA IQ - higher frequency but slightly higher quiescent current. | Requires smaller 1 µH inductor; better suited for designs prioritizing minimum inductor size over absolute lowest IQ. | Select TPS62231DRYR when board space is constrained and 3 MHz operation aligns with system EMI requirements. |
| AP63205WU-12 | 1.2 V fixed output, 600 mA, 2 MHz, 25 µA IQ - same package but 0.05 V lower output and higher IQ. | Not drop-in compatible due to 1.2 V vs. 1.25 V; acceptable only if downstream ICs tolerate tighter VDD margin. | Choose AP63205WU-12 only after verifying 1.2 V compliance across entire load/temperature range of target application. |
Compared with LM3671MF-1.25/NOPB, TPS62231DRYR offers higher switching frequency for smaller passives but trades off 3 µA higher light-load IQ, while AP63205WU-12 provides identical current capability and package but lacks the precise 1.25 V output required for sensitive analog cores - making LM3671MF-1.25/NOPB optimal for accuracy-critical, battery-limited portable systems.
Availability
LM3671MF-1.25/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and wireless handheld terminals requiring stable component supply with consistent parametric performance across production batches.
Supply support for LM3671MF-1.25/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 IC design for portable and automotive markets.
The LM3671 product line was engineered specifically for space- and energy-constrained portable electronics, delivering high-efficiency, low-noise, and minimal-component-count DC-DC conversion from single-cell battery inputs.
FAQ
What is the output voltage tolerance of LM3671MF-1.25/NOPB over temperature?
The LM3671MF-1.25/NOPB maintains a fixed 1.25 V output with ±4% tolerance across the full operating junction temperature range of −40°C to +125°C. This specification is verified per electrical characteristics table in the official TI datasheet SNVS294S, ensuring predictable performance in thermally demanding handheld enclosures where ambient temperatures exceed 85°C.
Does LM3671MF-1.25/NOPB require external feedback resistors?
No, LM3671MF-1.25/NOPB does not require external feedback resistors. As a fixed-output variant, it integrates an internal resistor divider referenced to a 0.5 V internal bandgap, directly setting the output to 1.25 V. The FB pin connects solely to the output capacitor - eliminating component count, layout sensitivity, and trimming errors associated with adjustable versions.
What package type is used for LM3671MF-1.25/NOPB?
LM3671MF-1.25/NOPB is supplied in the 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm with wettable flanks. This leadless, space-efficient package supports high-density routing and automated optical inspection, distinguishing it from SOT-23 and DSBGA variants in the LM3671 family.
How does LM3671MF-1.25/NOPB manage efficiency at light loads?
LM3671MF-1.25/NOPB automatically transitions from PWM to PFM mode below ~80 mA load, reducing quiescent current to 16 µA typical. In PFM mode, it regulates output voltage by varying switching frequency rather than duty cycle, preserving >85% efficiency down to 1 mA - critical for battery longevity in always-on sensor and communication subsystems.
Is LM3671MF-1.25/NOPB qualified for automotive applications?
No, LM3671MF-1.25/NOPB is not automotive-qualified. Only the LM3671-Q1 variant meets AEC-Q100 Grade 1 (−40°C to +125°C) requirements. The LM3671MF-1.25/NOPB is rated for industrial temperature range (−40°C to +85°C ambient) and intended for consumer and industrial portable electronics, not safety-critical automotive ECUs or infotainment systems.
LM3671MF-1.25/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):
- 1.25V
- 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-1.25/NOPB FAQ
1.How can I place an order for LM3671MF-1.25/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.25/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 LM3671MF-1.25/NOPB reliable?
The price and inventory of LM3671MF-1.25/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-1.25/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.25/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.25/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.25/NOPB?
LM3671MF-1.25/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.25/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 LM3671MF-1.25/NOPB?
For technical support, including LM3671MF-1.25/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.25/NOPB requirements.
6.How does Aetrix verify that LM3671MF-1.25/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.25/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 LM3671MF-1.25/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.25/NOPB?
All LM3671MF-1.25/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.25/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 LM3671MF-1.25/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-1.25/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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