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Texas Instruments LM3671TLX-1.2/NOPB
- Part No.:
- LM3671TLX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
LM3671TLX-1.2/NOPB from Texas Instruments is a fixed-output 1.2 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 handheld instruments.
For engineers reviewing the LM3671TLX-1.2/NOPB datasheet, LM3671TLX-1.2/NOPB pinout, LM3671TLX-1.2/NOPB application, or LM3671TLX-1.2/NOPB equivalent, key selection considerations include its USON-6 package footprint, internal 0.5 V reference, 1.2 V ±4% output tolerance, integrated PFET/NFET synchronous rectification, and thermal shutdown protection at 150°C.
Technical Context
The LM3671TLX-1.2/NOPB employs voltage-mode control with input-voltage feed-forward to maintain stable regulation across line and load variations. Its internal 0.5 V reference feeds an error amplifier that compares FB voltage against this threshold to modulate PFET on-time.
It supports three functional modes: PWM (2 MHz fixed frequency, >80 mA load), PFM (hysteretic, ~16 µA IQ, <80 mA), and shutdown (0.01 µA). Internal synchronous rectification replaces external diodes, reducing conduction loss and improving efficiency at low output voltages like 1.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - eliminates external feedback resistors and simplifies layout for space-constrained designs. |
| Max Output Current | 600 mA - sufficient to power core logic, RF transceivers, or memory subsystems in portable devices. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (fully charged to 4.2 V) and USB-powered systems. |
| Switching Frequency | 2 MHz (typical) - enables use of small 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for compact BOMs. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends standby time in always-on sensor nodes or low-power wake-up circuits. |
| Shutdown Current | 0.01 µA (typical) - minimizes battery drain during system sleep or transport mode. |
| Internal Reference | 0.5 V - sets feedback divider ratio for fixed 1.2 V output; enables precise regulation independent of external resistor tolerances. |
Pinout & Package
LM3671TLX-1.2/NOPB uses the 6-pin USON (NKH) package: 2.00 mm × 2.00 mm body, 0.5 mm pitch, wettable flank terminals for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be decoupled locally to suppress high-frequency switching noise. |
| SW | Switch Node | Drives external inductor; carries high dv/dt pulses - requires short, low-inductance trace routing to minimize EMI and ringing. |
| FB | Feedback Input | Internally connected to fixed 1.2 V divider; tied directly to output capacitor - no external resistors needed. |
| EN | Enable Control | Digital input: >1 V enables operation; <0.4 V forces shutdown - pull-up required if not actively driven. |
| GND | Power Ground | Primary return path for input/output currents; must be connected to low-impedance ground plane under IC. |
| SGND | Signal Ground | Separate analog ground for feedback reference; ties to GND at single point near FB pin to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by up to 8% at 1.2 V output. |
| Automatic PFM-PWM Mode Switching | Seamlessly transitions between high-efficiency light-load PFM and low-noise heavy-load PWM without external control signals. |
| Internal Soft Start | Staged current limit ramp (70 → 140 → 280 → 1020 mA) prevents inrush current spikes during power-up with 10 µF output capacitance. |
| Thermal Shutdown Protection | Disables switching at TJ ≈ 150°C and resumes at TJ ≈ 130°C - protects device during sustained overload or poor PCB thermal design. |
| Only Three External Components | Requires just one 2.2 µH inductor and two ceramic capacitors (CIN = 4.7 µF, COUT = 10 µF) - reduces BOM count and board area by >40% vs. non-synchronous solutions. |
Applications
| Mobile Phone Power Rail | Portable Medical Sensor |
|---|---|
Use Scenario: Powers baseband processor core voltage (VDD_CORE) from a single Li-Ion cell in slim smartphone designs. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.2 V at up to 600 mA with fast transient response to CPU burst loads. Use Value: 2 MHz switching enables use of tiny 2.2 µH inductor and avoids audible noise; PFM mode extends talk-time by 12% during idle periods. | Use Scenario: Supplies regulated 1.2 V to ultra-low-power biosignal acquisition ICs (e.g., EEG/ECG front-ends) in wearable patches. IC Role / Device Role / Timing Role: Always-on power source maintaining sub-µA quiescent budget while supporting rapid wake-from-sleep response. Use Value: 16 µA PFM IQ and 0.01 µA shutdown current enable multi-week battery life on coin-cell equivalents; USON-6 footprint fits <8 mm² PCB area. |
| Digital Still Camera Image Sensor | Wireless Home-Automation Hub |
Use Scenario: Provides clean 1.2 V bias to CMOS image sensor logic and interface circuitry during burst capture sequences. IC Role / Device Role / Timing Role: High-transient-response buck converter handling 0–400 mA load steps within 10 µs without violating 30 mV output deviation. Use Value: Internal soft-start prevents camera startup glitches; synchronous rectification maintains >90% efficiency at 400 mA, reducing thermal stress on plastic lens housing. | Use Scenario: Powers Zigbee/Thread SoC and flash memory in battery-operated smart thermostat or lighting controller. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 3.0–3.6 V battery to 1.2 V core rail, supporting periodic radio wake-ups and firmware updates. Use Value: Automatic PFM entry during 99% idle time cuts average system current to <5 µA; USON package withstands reflow and vibration in consumer enclosures. |
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 | Fixed 1.2 V output, 600 mA, 3 MHz switching, 17 µA IQ - smaller 2.0 × 2.0 mm WSON but requires 1.5 µH inductor. | Higher frequency allows marginally smaller magnetics; slightly higher IQ reduces ultra-light-load advantage. | Select when board space is constrained and 3 MHz EMI profile aligns with system filtering. |
| AP63202WU-12 | Fixed 1.2 V, 2 A, 2.2 MHz, 25 µA IQ - larger current capability and wider VIN range (2.5–5.5 V), but 2.9 × 2.8 mm WLCSP package. | Over-spec'd current rating adds cost and size; higher IQ degrades standby efficiency in battery-critical apps. | Select only if future-proofing for >600 mA loads or need 2.5 V minimum input (e.g., partially discharged LiFePO₄). |
Compared with TPS62231DRVR and AP63202WU-12, LM3671TLX-1.2/NOPB offers optimal balance of ultra-low IQ (16 µA), proven 2 MHz stability in portable audio/video systems, and USON-6 manufacturability - making it preferred for cost-sensitive, battery-life-optimized designs where 600 mA suffices.
Availability
LM3671TLX-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical sensors, and wireless home-automation hubs requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM3671TLX-1.2/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, embedded processing, and digital signal technologies - serving automotive, industrial, personal electronics, and communications markets.
The LM3671 product line delivers highly integrated, low-quiescent-current DC-DC converters for space- and battery-constrained portable electronics, with fixed-output variants like LM3671TLX-1.2/NOPB targeting core voltage rails in smartphones and wearables.
FAQ
What is the recommended input capacitor for LM3671TLX-1.2/NOPB?
The LM3671TLX-1.2/NOPB datasheet specifies a 4.7 µF ceramic input capacitor (CIN) placed as close as possible to the VIN and GND pins. This value ensures stable operation across the 2.7–5.5 V input range and suppresses high-frequency switching noise. X5R or X7R dielectrics with 6.3 V or higher rating are recommended to maintain capacitance under DC bias.
Does LM3671TLX-1.2/NOPB require external feedback resistors?
No. LM3671TLX-1.2/NOPB is a fixed-output variant with internal resistor divider set for 1.2 V. The FB pin connects directly to the output capacitor - no external resistors are needed, eliminating associated tolerance errors and saving PCB area. This differs from the adjustable LM3671MF-ADJ version, which requires external R1/R2.
What thermal derating applies to LM3671TLX-1.2/NOPB in a 4-layer PCB?
For the USON-6 (NKH) package on a 4-layer board, LM3671TLX-1.2/NOPB has RθJA = 174.7°C/W. At 85°C ambient, maximum continuous power dissipation drops to 242 mW - limiting practical 1.2 V output current to ~500 mA under worst-case conditions. Thermal vias under the exposed pad and copper pour significantly improve this rating.
How does LM3671TLX-1.2/NOPB handle short-circuit events?
LM3671TLX-1.2/NOPB incorporates cycle-by-cycle current limiting (1020 mA typical peak) and thermal shutdown (150°C trip). During output short, it enters timed current-limit mode: NFET remains on longer to allow inductor current decay, preventing runaway. If temperature exceeds threshold, switching halts until junction cools to ~130°C, then resumes automatically.
Can LM3671TLX-1.2/NOPB operate from a 2.5 V input?
No. LM3671TLX-1.2/NOPB has a minimum recommended input voltage of 2.7 V per datasheet Section 6.4. Operation below 2.7 V risks undervoltage lockout activation, unstable regulation, or failure to start. For 2.5 V input compatibility, consider alternatives like AP63202WU-12 (2.5 V min) or TI's TPS62840 (1.8 V min), though these differ in pinout and features.
LM3671TLX-1.2/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):
- 1.2V
- 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 (1.5x1.2)
LM3671TLX-1.2/NOPB FAQ
1.How can I place an order for LM3671TLX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-1.2/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 LM3671TLX-1.2/NOPB reliable?
The price and inventory of LM3671TLX-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TLX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-1.2/NOPB?
LM3671TLX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-1.2/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 LM3671TLX-1.2/NOPB?
For technical support, including LM3671TLX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-1.2/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-1.2/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 LM3671TLX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-1.2/NOPB?
All LM3671TLX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-1.2/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 LM3671TLX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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