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Texas Instruments LM3671TLX-3.3/NOPB
- Part No.:
- LM3671TLX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:6,130
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Product details
Overview
LM3671TLX-3.3/NOPB from Texas Instruments is a fixed-output 3.3 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery input (2.7 V to 5.5 V), delivering up to 600 mA load current with 16 µA typical quiescent current and internal soft-start. It serves as the primary power supply for low-voltage digital subsystems in space-constrained portable electronics.
For engineers reviewing the LM3671TLX-3.3/NOPB datasheet, LM3671TLX-3.3/NOPB pinout, LM3671TLX-3.3/NOPB application, or LM3671TLX-3.3/NOPB equivalent, key selection criteria include its USON-6 package footprint, 3.3 V ±2.5% output tolerance, automatic PFM-PWM mode switching, thermal shutdown at 150°C, and compatibility with only three external components: one 2.2 µH inductor and two ceramic capacitors.
Technical Context
The LM3671TLX-3.3/NOPB implements voltage-mode PWM control with input voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input range. Its internal 0.5 V reference feeds an error amplifier that compares FB voltage against this threshold to modulate PFET on-time.
It integrates complementary PFET and NFET switches with RDSON(P) = 380–500 mΩ and RDSON(N) = 250–400 mΩ, enabling synchronous rectification. Mode transitions-PWM (>80 mA), PFM (light load), and shutdown (<0.01 µA)-are fully autonomous and require no external control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% (TL grade); enables direct powering of 3.3 V I/O rails without external feedback resistors. |
| Input Voltage Range | 2.7 V to 5.5 V; supports full discharge curve of single Li-Ion cell (3.0–4.2 V nominal) plus margin for transient spikes. |
| Max Load Current | 600 mA continuous; sufficient for core logic, RF transceivers, or display drivers in handheld devices. |
| Switching Frequency | 2 MHz (typical, ±20% over temp); permits use of ultra-small 2.2 µH inductors and 10 µF ceramic output capacitors. |
| Quiescent Current | 16 µA typical in PFM mode; extends battery runtime during standby or low-activity states in portable instruments. |
| Shutdown Current | 0.01 µA typical; reduces system leakage to negligible levels when host MCU asserts EN = low. |
| Thermal Shutdown | Activates at TJ ≈ 150°C (typical); protects device under sustained overload or poor PCB thermal design. |
Pinout & Package
LM3671TLX-3.3/NOPB uses the USON-6 (NKH) package: 2.00 mm × 2.00 mm, 0.5 mm pitch, bottom-exposed thermal pad. Pin 1 marked by dot; top-side marking includes TI logo and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Connects to input filter capacitor; must be decoupled within 3 mm of pin to suppress high-frequency switching noise. |
| GND (Pin 2) | Power Ground | Primary return path for input and output currents; requires low-impedance connection to thermal pad and PCB ground plane. |
| EN (Pin 3) | 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. |
| FB (Pin 4) | Feedback Input | Internally connected to 3.3 V divider; shorted directly to VOUT for fixed-output operation-no external resistors needed. |
| SW (Pin 5) | Switch Node | Drives external inductor; carries high di/dt square wave-requires tight layout, minimal trace length, and guard ring. |
| SGND (Pin 6) | Signal Ground | Separate analog ground for FB reference; connects internally to GND but must be routed separately on PCB to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by ≥8% at 300 mA vs. asynchronous designs. |
| Automatic PFM-PWM Transition | Seamlessly shifts between high-efficiency light-load PFM (16 µA IQ) and low-noise PWM (2 MHz) without firmware or external circuitry. |
| Integrated Soft-Start | Ramps output voltage over ~275–400 µs (load-dependent); prevents inrush current into large output capacitors and stabilizes upstream regulators. |
| Three-Component Solution | Requires only one 2.2 µH inductor and two ceramic caps (CIN = 4.7 µF, COUT = 10 µF); minimizes BOM count and board area in compact layouts. |
| Overcurrent & Thermal Protection | Current limit trips at 1020 mA (open-loop), with thermal shutdown at 150°C-prevents damage during short-circuit or ambient overheating. |
Applications
| Mobile Phone Power Management | Wireless Audio Transceiver Supply |
|---|---|
Use Scenario: Powers baseband processor I/O, camera sensor interface, and touchscreen controller from shared Li-Ion battery rail. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering regulated power with fast transient response to dynamic load steps. Use Value: Maintains stable 3.3 V under 10–600 mA load swings with <±1.5% output deviation, preventing logic errors during burst data transmission. |
Use Scenario: Supplies 3.3 V to Bluetooth/Wi-Fi SoC and audio codec in wireless earbuds or speaker modules. IC Role / Device Role / Timing Role: Efficient intermediate rail generator supporting both active RF transmit and low-power listening modes. Use Value: Achieves >90% efficiency at 50 mA (PFM) and >85% at 300 mA (PWM), extending playback time while minimizing thermal rise in sealed enclosures. |
| Portable Medical Sensor Hub | Automotive Infotainment Display Backlight Driver Support |
Use Scenario: Provides clean 3.3 V for ECG/SpO₂ analog front-end, microcontroller, and BLE radio in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-noise, low-quiescent power supply ensuring signal integrity and long battery life between clinical sessions. Use Value: Delivers 16 µA IQ in standby and <10 mVpp output ripple, preserving ADC resolution and reducing need for post-regulation LDOs. |
Use Scenario: Generates 3.3 V auxiliary rail for display timing controller, touch IC, and CAN transceiver interface in automotive head units. IC Role / Device Role / Timing Role: Secondary DC-DC stage supporting infotainment subsystems requiring AEC-Q100-compliant performance. Use Value: Withstands 12 V cold-crank transients via robust input rating (6 V abs max), and operates reliably from –40°C to +125°C junction temperature. |
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 | Fixed 3.3 V, 3-MHz switching, 400-mA max load, 17 µA IQ, WSON-6 package (2.0 × 2.0 mm). | Limited peak current (400 mA vs. 600 mA); less suitable for high-pulse loads like camera flash or RF PA bursts. | Select when higher frequency allows smaller magnetics and lower output ripple is prioritized over peak current capability. |
| AP63203WU-7 | Fixed 3.3 V, 2-MHz, 3-A max load, 25 µA IQ, WLCSP-12 package (1.5 × 1.5 mm), integrated inductor option available. | Higher current and larger package footprint; over-specified for 600-mA use cases but offers headroom for future upgrades. | Choose when board space is extremely constrained and integrated inductor simplifies layout-even though cost and IQ are higher than LM3671TLX-3.3/NOPB. |
Compared with TPS62231DRYR and AP63203WU-7, LM3671TLX-3.3/NOPB delivers optimal balance of 600-mA capability, ultra-low 16-µA quiescent current, and minimal external component count in a proven 2-mm² USON package-making it ideal for cost-sensitive, battery-powered portable designs where peak load and standby efficiency are both critical.
Availability
LM3671TLX-3.3/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical sensors, and wireless audio devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671TLX-3.3/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 power management ICs, with decades of expertise in high-efficiency DC-DC conversion for portable and automotive markets.
The LM3671TLX-3.3/NOPB belongs to TI's low-quiescent-current buck converter product line, engineered specifically for battery-powered portable electronics needing compact, reliable, and highly efficient power delivery from single-cell Li-Ion sources.
FAQ
What is the recommended input capacitor for LM3671TLX-3.3/NOPB?
The LM3671TLX-3.3/NOPB datasheet specifies a 4.7 µF ceramic input capacitor placed as close as possible to 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. Using undersized or high-ESR capacitors may cause input voltage droop and erratic regulation in LM3671TLX-3.3/NOPB.
Does LM3671TLX-3.3/NOPB require an external feedback resistor network?
No. The LM3671TLX-3.3/NOPB is a fixed-output variant with internal feedback divider set for 3.3 V. Pin FB is internally connected to the 0.5 V reference and output divider, so it must be connected directly to the VOUT node-no external resistors are needed or permitted. Adding external resistors would disrupt regulation and is incompatible with LM3671TLX-3.3/NOPB functionality.
What thermal considerations apply to LM3671TLX-3.3/NOPB in a 4-layer PCB?
For LM3671TLX-3.3/NOPB in a standard 4-layer board, the junction-to-ambient thermal resistance (RθJA) is 174.7°C/W. At 600 mA load and 3.6 V input, power dissipation is ~300 mW-resulting in ~52°C junction rise above ambient. To stay within the 125°C max junction limit, ambient temperature must remain ≤73°C. Adequate copper pour under the thermal pad and inner-layer ground planes are essential for reliable LM3671TLX-3.3/NOPB operation.
Can LM3671TLX-3.3/NOPB operate with a 2.2 µH inductor rated for only 500 mA saturation current?
No. The LM3671TLX-3.3/NOPB peak switch current reaches 1020 mA (typical). A 500 mA saturation-rated inductor will saturate well below full load, causing loss of regulation, excessive heating, and potential failure. TI recommends a 2.2 µH shielded power inductor with ≥1.2 A saturation current and ≤150 mΩ DCR for robust LM3671TLX-3.3/NOPB performance across its full 600 mA range.
How does LM3671TLX-3.3/NOPB handle startup into heavy load?
The LM3671TLX-3.3/NOPB implements staged soft-start: switch current limit ramps from 70 mA → 140 mA → 280 mA → 1020 mA (typical) over ~400 µs with a 10 µF output capacitor and 300 mA load. This prevents output overshoot and limits inrush current. If the load exceeds the instantaneous current limit during ramp-up, regulation holds until the final limit engages-ensuring controlled, repeatable startup behavior in LM3671TLX-3.3/NOPB applications.
LM3671TLX-3.3/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):
- 3.3V
- 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)
LM3671TLX-3.3/NOPB FAQ
1.How can I place an order for LM3671TLX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM3671TLX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-3.3/NOPB?
LM3671TLX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-3.3/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-3.3/NOPB?
For technical support, including LM3671TLX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-3.3/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-3.3/NOPB?
All LM3671TLX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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