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Texas Instruments LM3671TL-1.5/NOPB
- Part No.:
- LM3671TL-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:410
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Product details
Overview
LM3671TL-1.5/NOPB from Texas Instruments is a fixed-output 1.5 V, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package, operating from 2.7 V to 5.5 V input, featuring 2-MHz PWM switching, 16-µA quiescent current in PFM mode, and internal soft start. It powers core logic rails in space-constrained portable electronics such as MP3 players and digital still cameras.
For engineers reviewing the LM3671TL-1.5/NOPB datasheet, LM3671TL-1.5/NOPB pinout, LM3671TL-1.5/NOPB application, or LM3671TL-1.5/NOPB equivalent, key selection criteria include output voltage accuracy (±2.5% over temperature), thermal shutdown at 150°C (typ), shutdown current ≤1 µA, and compatibility with 2.2-µH inductors and 4.7-µF/10-µF ceramic capacitors in minimal-footprint designs.
Technical Context
The LM3671TL-1.5/NOPB uses voltage-mode control with input feed-forward for stable regulation across 2.7–5.5 V input and 1.5 V output. Its integrated PFET/NFET synchronous rectifier enables high efficiency at low output voltages, while automatic PFM-PWM mode switching maintains >85% efficiency from 1 mA to 600 mA load.
Functional operation relies on a 0.5-V internal reference, feedback-sensed regulation via the FB pin (internally connected to fixed 1.5 V divider), and cycle-by-cycle current limiting at 1020 mA (typ). Soft-start ramps switch current limit in discrete steps (70/140/280/1020 mA) to limit inrush during EN assertion after VIN ≥2.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.5% over –40°C to +125°C ambient - ensures stable core supply for low-voltage ASICs and microcontrollers. |
| Max Output Current | 600 mA continuous - supports moderate-power RF modules and display drivers without external heatsinking. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-ion (3.0–4.2 V), USB 5 V, and 3.3 V system rails. |
| Switching Frequency | 2 MHz (typ), 1.6–2.6 MHz over temperature - enables use of 2.2-µH inductors <2.5 mm² footprint and reduces EMI above AM band. |
| Quiescent Current | 16 µA (typ) in PFM mode - extends battery life in standby states of handheld instruments and medical sensors. |
| Shutdown Current | 0.01 µA (typ), ≤1 µA over temperature - eliminates parasitic drain in always-off subsystems. |
| Thermal Shutdown | Engages at TJ = 150°C (typ), disengages at 130°C (typ) - protects against sustained overload in sealed enclosures. |
Pinout & Package
LM3671TL-1.5/NOPB is housed in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm (nominal), with wettable flanks for automated optical inspection. The exposed pad is electrically connected to GND for thermal conduction and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; supplies internal bias and switch driver circuits. |
| SW | Switching node | Drives external inductor; connects internally to PFET drain and NFET source; requires low-inductance layout. |
| FB | Feedback input | Internally tied to fixed 1.5 V resistor divider; no external components required for regulation. |
| EN | Enable control | Digital input: device enabled when >1 V, shutdown when <0.4 V; must not be left floating. |
| GND | Power ground | Primary return path for input/output currents; connects to exposed thermal pad. |
| SGND | Signal ground | Separate analog ground for FB reference; ties internally to GND but benefits from dedicated PCB trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PFET/NFET replaces external Schottky diode, reducing conduction loss and enabling >90% peak efficiency at 300 mA. |
| Automatic PFM-PWM transition | Seamlessly shifts modes at ~80 mA load threshold, maintaining >80% efficiency from 1 mA to full 600 mA without manual configuration. |
| Internal soft start | Staged current-limit ramp (70→140→280→1020 mA) limits inrush into 10-µF output caps, achieving 275–400 µs startup time. |
| Thermal & current protection | Combines cycle-by-cycle current limiting (1020 mA typ) and thermal shutdown (150°C) to prevent damage under fault conditions. |
| Minimal external parts | Requires only one 2.2-µH inductor and two ceramic capacitors (4.7 µF input, 10 µF output) - reduces BOM count and board area. |
Applications
| Mobile Phone Baseband Power | MP3 Player Audio Codec Supply |
|---|---|
Use Scenario: Powers baseband processor core rail in dual-mode GSM/UMTS handsets with tight PCB area constraints. IC Role / Device Role / Timing Role: Primary 1.5 V buck regulator delivering up to 600 mA with fast transient response to burst-mode processing loads. Use Value: 2-MHz switching avoids interference with cellular RF bands while enabling compact 2.2-µH inductor placement near processor. |
Use Scenario: Supplies clean 1.5 V to stereo audio DAC/ADC in battery-powered MP3 players with <8-hour playback target. IC Role / Device Role / Timing Role: Low-noise, high-efficiency power stage operating in PFM mode during music pause and PWM during playback bursts. Use Value: 16-µA quiescent current extends battery runtime; internal soft start prevents pop noise at power-on. |
| Digital Still Camera Image Sensor Bias | Portable Medical Pulse Oximeter Core Logic |
Use Scenario: Provides regulated 1.5 V to CMOS image sensor interface logic and timing controller in compact DSC modules. IC Role / Device Role / Timing Role: Fixed-output buck converter with fast line/load transient response (<10 µs recovery) to maintain sensor clock stability. Use Value: Thermal shutdown (150°C) prevents overheating during extended capture sessions; USON package fits 8-mm wide camera PCBs. |
Use Scenario: Powers ARM Cortex-M0+ microcontroller and analog front-end in FDA-cleared handheld pulse oximeters. IC Role / Device Role / Timing Role: Safety-relevant power IC delivering stable 1.5 V under varying battery voltage (3.0–4.1 V) and temperature (–20°C to +50°C). Use Value: 0.01-µA shutdown current preserves battery charge during transport; AEC-Q200-qualified variants available for automotive-grade reliability. |
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 | 1.5 V fixed, 600 mA, 3-MHz switching, 17-µA IQ, 2.05–6.0 V input - higher frequency allows smaller inductor but tighter layout tolerances. | Optimized for ultra-thin wearables; lacks thermal shutdown hysteresis (130°C/150°C) and has no SGND pin. | Select when board space is <15 mm² and input can exceed 5.5 V; verify thermal performance with 3-MHz ripple. |
| AP3418W6-15 | 1.5 V fixed, 600 mA, 2-MHz switching, 25-µA IQ, 2.5–5.5 V input - wider input range, higher quiescent current, no soft start. | Targeted at cost-sensitive consumer electronics; missing current limit reporting and thermal foldback. | Choose for price-sensitive volume production where 25-µA IQ is acceptable and soft-start sequencing is handled externally. |
Compared with TPS62231DRYR and AP3418W6-15, LM3671TL-1.5/NOPB provides superior light-load efficiency via intelligent PFM entry, robust thermal management with hysteresis, and dedicated SGND for precision feedback - making it preferred for battery-critical portable instrumentation.
Availability
LM3671TL-1.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM3671TL-1.5/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM3671TL-1.5/NOPB belongs to TI's portable power management portfolio, engineered specifically for space- and efficiency-constrained battery-powered devices requiring reliable, low-quiescent-current DC-DC conversion.
FAQ
What is the recommended input capacitor for LM3671TL-1.5/NOPB?
The LM3671TL-1.5/NOPB datasheet specifies a 4.7-µF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins. This value minimizes input ripple and sustains switching current during high-frequency operation. For systems with noisy input sources, a parallel 0.1-µF capacitor is advised to suppress HF noise. LM3671TL-1.5/NOPB does not require bulk electrolytic capacitance due to its 2-MHz switching and internal current limiting.
Does LM3671TL-1.5/NOPB require an external feedback resistor network?
No. LM3671TL-1.5/NOPB is a fixed-output variant with internal resistor dividers configured for 1.5 V. The FB pin is internally connected and must be left unconnected externally. Adding external resistors will disrupt regulation and may cause overvoltage or instability. LM3671TL-1.5/NOPB differs from the adjustable LM3671MF-ADJ, which requires external R1/R2 for output setting.
How does LM3671TL-1.5/NOPB handle short-circuit conditions?
LM3671TL-1.5/NOPB employs cycle-by-cycle current limiting with a typical trip threshold of 1020 mA. During sustained short-circuit, it enters timed current limit mode: the NFET remains on longer to allow inductor current decay, preventing thermal runaway. If junction temperature reaches 150°C, thermal shutdown activates and holds until cooling to 130°C. LM3671TL-1.5/NOPB resumes operation automatically after fault clearance.
Can LM3671TL-1.5/NOPB operate from a 2.5 V input?
No. LM3671TL-1.5/NOPB has a minimum recommended input voltage of 2.7 V per the datasheet's Recommended Operating Conditions. At 2.5 V, the internal bias circuitry cannot sustain regulation, leading to dropout, erratic enable behavior, or failure to start. For 2.5 V input systems, consider the LM3671TL-1.2/NOPB (1.2 V output) or alternative regulators with lower VIN(min) specifications.
What is the thermal resistance (RθJA) of LM3671TL-1.5/NOPB in its USON package?
LM3671TL-1.5/NOPB in the 6-pin USON (NKH) package has a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W on a standard 4-layer PCB per JEDEC JESD51-7. This value assumes 1-in² copper pour under the exposed pad and 2 oz copper layers. Derating is required above 25°C ambient; at 60°C, maximum power dissipation drops to 394 mW to maintain TJ ≤125°C.
LM3671TL-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- 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):
- 1.5V
- 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:
- 5-DSBGA (1.41x1.08)
LM3671TL-1.5/NOPB FAQ
1.How can I place an order for LM3671TL-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-1.5/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 LM3671TL-1.5/NOPB reliable?
The price and inventory of LM3671TL-1.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TL-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-1.5/NOPB?
LM3671TL-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-1.5/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 LM3671TL-1.5/NOPB?
For technical support, including LM3671TL-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-1.5/NOPB requirements.
6.How does Aetrix verify that LM3671TL-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-1.5/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 LM3671TL-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-1.5/NOPB?
All LM3671TL-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-1.5/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 LM3671TL-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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