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Texas Instruments LM3671QTLX-1.8/NOPB
- Part No.:
- LM3671QTLX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671QTLX-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
LM3671QTLX-1.8/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package, optimized for single Li-Ion battery input (2.7 V to 5.5 V) and delivering a fixed 1.8 V output. It features automatic PFM-PWM mode switching, 16 µA typical quiescent current in light-load PFM mode, internal soft start, and thermal/overcurrent protection. It powers core voltage rails in mobile phones and portable instrumentation requiring compact, high-efficiency regulation.
For engineers reviewing the LM3671QTLX-1.8/NOPB datasheet, LM3671QTLX-1.8/NOPB pinout, LM3671QTLX-1.8/NOPB application, or LM3671QTLX-1.8/NOPB equivalent, key selection criteria include its fixed 1.8 V output, 2 MHz switching frequency enabling small external components (2.2 µH inductor, two ceramic capacitors), 600 mA load capability, automotive-grade qualification (AEC-Q100 Grade 1), and USON package thermal performance (RθJA = 174.7°C/W).
Technical Context
The LM3671QTLX-1.8/NOPB employs voltage-mode PWM control with input-voltage feed-forward for stable line regulation, and transitions autonomously to hysteretic PFM mode below ~80 mA load to reduce quiescent current to 16 µA. Its internal synchronous rectification uses a PFET switch and NFET rectifier, with typical RDS(ON) of 380 mΩ (PFET) and 250 mΩ (NFET) at VIN = 3.6 V.
Regulation relies on a 0.5 V internal reference and fixed-resistor feedback network (not user-adjustable), yielding ±4% output voltage accuracy over –40°C to +125°C ambient. The device integrates undervoltage lockout, cycle-by-cycle current limiting (1020 mA typical peak), and thermal shutdown (trip at TJ ≈ 150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% over –40°C to +125°C - ensures stable core supply for low-voltage logic without external resistor divider. |
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion cell and common 3.3 V/5 V rails. |
| Max Output Current | 600 mA - sufficient for powering DSPs, microcontrollers, and RF ICs in portable systems. |
| Switching Frequency | 2 MHz (typical, ±0.4 MHz over temp) - enables use of tiny 2.2 µH inductors and 10 µF ceramic output capacitors. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life during standby or light-load operation in always-on subsystems. |
| Shutdown Current | 0.01 µA (typical) - minimizes leakage when system is powered down. |
| Thermal Protection | Internal thermal shutdown at TJ ≈ 150°C - prevents permanent damage under sustained overload or poor PCB heat sinking. |
Pinout & Package
LM3671QTLX-1.8/NOPB is housed in a 6-pin USON (NKH) package, 2.00 mm × 2.00 mm nominal body size, with wettable flanks for automated optical inspection. The package has an exposed thermal pad connected internally to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; must be ≥2.7 V before EN activation to ensure proper soft-start. |
| SW | Switching node | Drives external inductor; connects internally to PFET drain and NFET source; requires low-inductance layout to minimize EMI. |
| FB | Feedback input | Internally tied to fixed resistive divider for 1.8 V output; no external components required - simplifies BOM and layout. |
| EN | Enable control | Digital input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; must not float - tie to VIN or controller GPIO. |
| GND | Power ground | Primary return path for input/output currents; connect directly to thermal pad and low-impedance ground plane. |
| SGND | Signal ground | Separate analog ground for FB reference; must be connected to GND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Automated PFM-PWM transition | Switches seamlessly at ~80 mA load threshold - maintains >85% efficiency from 1 mA to 600 mA without manual mode control. |
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by up to 8% vs. asynchronous designs. |
| Internal soft-start | Ramps current limit in 70/140/280/1020 mA steps - limits inrush into 10 µF output capacitor to <400 µs startup time at 300 mA load. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C ambient - validated for automotive infotainment, ADAS camera modules, and body electronics. |
| Three-component solution | Requires only 2.2 µH inductor + two ceramic caps (CIN, COUT) - reduces board area by >40% vs. traditional buck controllers with external MOSFETs. |
Applications
| Mobile Phone Power Management | Automotive Camera Module Supply |
|---|---|
|
Use Scenario: Regulating 1.8 V core voltage for baseband processor and memory interface in LTE smartphones. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering clean, low-noise 1.8 V rail with fast transient response to burst-mode CPU loads. Use Value: 2 MHz switching avoids AM radio band interference; 16 µA PFM quiescent current extends standby time by >30% versus 500 kHz alternatives. |
Use Scenario: Providing stable 1.8 V supply to image sensor and ISP in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with AEC-Q100 qualification, operating across automotive temperature range and vibration profiles. Use Value: Thermal shutdown and current limiting protect against short-circuit faults in harsh environments; USON package withstands reflow and mechanical stress. |
| Portable Medical Instrumentation | Wireless Handheld Terminal |
|
Use Scenario: Powering 1.8 V logic in portable ECG monitors and glucose meters with coin-cell or Li-Ion backup. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling >7-day battery life in low-duty-cycle sensing applications. Use Value: 0.01 µA shutdown current preserves battery during storage; small USON footprint fits tight space constraints in handheld enclosures. |
Use Scenario: Supplying 1.8 V to NFC controller and secure element in payment terminals used in retail and transit. IC Role / Device Role / Timing Role: Robust, low-noise power stage meeting EMI requirements for contactless communication interfaces. Use Value: Internal soft-start prevents bus voltage droop during power-up; PFM mode maintains >90% efficiency at 1–10 mA sleep currents. |
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 1.8 V, 600 mA, 3-MHz switching, 2.5-V min input, SOT-23-6 package | Lacks AEC-Q100 qualification; higher minimum input limits use with deep-discharge Li-Ion | Prefer for cost-sensitive industrial designs where automotive qualification is unnecessary. |
| MP2101DQ-LF-Z | Fixed 1.8 V, 600 mA, 2-MHz switching, 2.5–5.5 V input, QFN-6 package | No integrated soft-start; lower ESD rating (HBM ±2000 V vs. LM3671's ±2000 V); non-automotive qualified | Consider when footprint compatibility with QFN-6 is required and soft-start timing is managed externally. |
Compared with TPS62231DRVR and MP2101DQ-LF-Z, the LM3671QTLX-1.8/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 2.7 V minimum input for full Li-Ion utilization, and guaranteed soft-start behavior - making it the only choice for automotive and medical-grade portable systems demanding validated reliability.
Availability
LM3671QTLX-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, automotive camera module supply, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and automotive-grade traceability.
Supply support for LM3671QTLX-1.8/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and portable markets.
The LM3671 product line delivers highly integrated, small-footprint DC-DC converters targeting battery-powered devices where efficiency, size, and reliability are critical - especially in space-constrained, thermally challenging applications like smartphones and automotive sensors.
FAQ
What is the minimum input voltage required for stable operation of the LM3671QTLX-1.8/NOPB?
The LM3671QTLX-1.8/NOPB requires a minimum input voltage of 2.7 V for stable regulation and proper soft-start activation. Operation below this threshold may result in undervoltage lockout or unregulated output. The device is specifically designed to support the full discharge curve of a single Li-Ion cell, which ranges from 4.2 V down to ~2.7 V.
Does the LM3671QTLX-1.8/NOPB require external feedback resistors to set the 1.8 V output?
No, the LM3671QTLX-1.8/NOPB does not require external feedback resistors. It integrates a precision internal resistor divider calibrated for a fixed 1.8 V output referenced to its 0.5 V internal bandgap. This eliminates component count, layout complexity, and tolerance drift - all while maintaining ±4% output accuracy across temperature and load.
How does the LM3671QTLX-1.8/NOPB manage efficiency at light loads?
The LM3671QTLX-1.8/NOPB automatically switches from PWM to PFM mode below ~80 mA load, reducing quiescent current to 16 µA typical. In PFM mode, it modulates switching frequency instead of duty cycle, minimizing gate drive losses and sustaining >85% efficiency even at 1 mA output current - critical for battery longevity in standby applications.
Is the LM3671QTLX-1.8/NOPB qualified for automotive applications?
Yes, the LM3671QTLX-1.8/NOPB is AEC-Q100 Grade 1 qualified, rated for ambient temperatures from –40°C to +125°C. It meets stringent automotive reliability standards including HBM ±2000 V ESD, thermal shutdown, and current-limit protection - making it suitable for infotainment, ADAS camera modules, and body control units.
What package type and thermal characteristics does the LM3671QTLX-1.8/NOPB use?
The LM3671QTLX-1.8/NOPB uses a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm with an exposed thermal pad. Its junction-to-ambient thermal resistance is 174.7°C/W on a 4-layer board, and it features SGND and GND separation to optimize noise immunity - essential for stable regulation in dense, thermally constrained layouts.
LM3671QTLX-1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3671QTLX-1.8/NOPB FAQ
1.How can I place an order for LM3671QTLX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671QTLX-1.8/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 LM3671QTLX-1.8/NOPB reliable?
The price and inventory of LM3671QTLX-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671QTLX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671QTLX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671QTLX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671QTLX-1.8/NOPB?
LM3671QTLX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671QTLX-1.8/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 LM3671QTLX-1.8/NOPB?
For technical support, including LM3671QTLX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671QTLX-1.8/NOPB requirements.
6.How does Aetrix verify that LM3671QTLX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671QTLX-1.8/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 LM3671QTLX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671QTLX-1.8/NOPB?
All LM3671QTLX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671QTLX-1.8/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 LM3671QTLX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671QTLX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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