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Texas Instruments LM3671TLX-1.8/NOPB
- Part No.:
- LM3671TLX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LM3671TLX-1.8/NOPB from Texas Instruments is a fixed-output 1.8 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 below ~80 mA load, and achieves 16 µA typical quiescent current in light-load operation - enabling extended battery life in mobile phones and digital cameras.
For engineers reviewing the LM3671TLX-1.8/NOPB datasheet, LM3671TLX-1.8/NOPB pinout, LM3671TLX-1.8/NOPB application, or LM3671TLX-1.8/NOPB equivalent, key selection criteria include its USON-6 package footprint, internal 0.5 V reference, 1020 mA peak switch current limit, thermal shutdown at 150°C (typ), and compatibility with only three external components: one 2.2 µH inductor and two ceramic capacitors.
Technical Context
The LM3671TLX-1.8/NOPB implements voltage-mode control with input-voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input range. Its integrated PFET/NFET power stage enables synchronous rectification, eliminating external diode losses and supporting >90% efficiency at mid-load with 1.8 V output.
It features dual-mode operation: fixed 2 MHz PWM for low-noise, high-accuracy regulation above ~80 mA; and hysteretic PFM for ultra-low IQ (16 µA typ) during standby or light-load conditions. Soft-start limits inrush current via stepped current-limit ramping (70 → 140 → 280 → 1020 mA), and internal thermal shutdown engages at 150°C (typ) with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% over −40°C to +125°C - ensures stable core logic supply for ASICs/FPGAs without external feedback resistors. |
| Max Output Current | 600 mA continuous - supports moderate-power RF modules and camera ISPs without thermal derating on 4-layer PCB. |
| Switching Frequency | 2 MHz (typ), 1.6–2.6 MHz (min/max) - enables use of compact 2.2 µH inductors and reduces EMI filtering burden. |
| Quiescent Current | 16 µA (typ) in PFM mode - extends battery runtime in always-on sensor nodes and idle UI states. |
| Shutdown Current | 0.01 µA (typ) - minimizes leakage drain during deep sleep in handheld medical devices. |
| Input Voltage Range | 2.7 V to 5.5 V - fully compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered 5 V rails. |
| Internal Reference | 0.5 V precision bandgap - provides stable feedback threshold for accurate output regulation independent of temperature. |
Pinout & Package
LM3671TLX-1.8/NOPB uses the 6-pin USON (NKH) package: 2.00 mm × 2.00 mm body, 0.5 mm pitch, wettable flank leads for automated optical inspection. Thermal pad exposed on bottom improves heat dissipation (RθJA = 174.7°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be decoupled with ≥4.7 µF ceramic capacitor close to pin. |
| GND | Power Ground | Primary return path for input/output currents; ties to PCB ground plane under thermal pad for thermal performance. |
| EN | Digital Enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V - requires pull-up or host MCU control, not left floating. |
| FB | Feedback Input | Internally connected to 1.8 V divider; no external resistors needed - direct connection to output capacitor ensures regulation accuracy. |
| SW | Switch Node | Drives external inductor; carries high dv/dt switching waveform - requires short, low-inductance trace to minimize EMI and ringing. |
| SGND | Signal Ground | Separate analog ground for FB reference; must tie to GND at single point near IC to avoid noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by up to 8% vs asynchronous designs. |
| Automatic PFM-PWM Mode Switching | Seamlessly transitions at ~80 mA load without external control - maintains >85% efficiency from 1 mA to 600 mA output current. |
| Internal Soft Start | Staged current-limit ramp (70/140/280/1020 mA) prevents input rail collapse during power-up with large output capacitance. |
| Thermal & Overcurrent Protection | Independent shutdown triggers at 150°C junction temp and 1020 mA peak switch current - protects IC and external inductor under fault conditions. |
| Ultra-Low Shutdown Current | 0.01 µA typical - enables true zero-power state in battery-backed systems like smart locks and wearables. |
Applications
| Mobile Phone Power Rail | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor I/O and memory interface in slim smartphone designs with constrained PCB area. IC Role / Device Role / Timing Role: Primary 1.8 V buck regulator delivering clean, regulated voltage with fast transient response to handle burst data transmission. Use Value: 2 MHz switching allows use of 2.2 µH inductor and 10 µF ceramic output cap - reducing solution size by >40% vs lower-frequency alternatives. | Use Scenario: Supplies image signal processor (ISP) core voltage in compact digital cameras requiring low-noise, stable 1.8 V. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with PFM mode for standby and PWM for active capture - minimizing battery drain during preview and recording. Use Value: 16 µA quiescent current in PFM mode extends battery life during idle periods without sacrificing 600 mA peak capability for sensor readout bursts. |
| Portable Medical Sensor Hub | Wireless Home-Automation Controller |
Use Scenario: Powers multi-sensor fusion module (ECG, SpO₂, temperature) in battery-operated patient monitors. IC Role / Device Role / Timing Role: Always-on 1.8 V supply with shutdown control - enables rapid wake-from-sleep response while maintaining sub-µA system standby. Use Value: 0.01 µA shutdown current ensures >1-year shelf life on coin cell; thermal shutdown prevents overheating during prolonged diagnostics. | Use Scenario: Regulates power for Zigbee/Thread SoC and flash memory in wall-mounted smart switches and thermostats. IC Role / Device Role / Timing Role: Efficient local DC-DC conversion from 3.3 V or 5 V input rail - supports intermittent wireless transmission and long-term sensor polling. Use Value: Internal synchronous FETs eliminate diode forward drop, sustaining >92% efficiency at 100 mA - critical for energy-harvesting or battery-only deployments. |
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 1.8 V output, 600 mA, 3 MHz switching, 17 µA IQ - slightly higher frequency but no PFM mode; uses 5-pin WSON. | Lacks automatic light-load mode switching - less optimal for battery life in variable-duty-cycle IoT sensors. | Prefer when EMI filtering is prioritized over light-load efficiency; verify layout compatibility with smaller 1.5 mm × 1.5 mm WSON. |
| AP63202WU-18 | Fixed 1.8 V, 2 A, 2.2 MHz, 25 µA IQ - higher current rating and larger 2 mm × 2 mm WLCSP package. | Over-spec'd current capability increases cost and BOM complexity for 600 mA use cases. | Select only if future-proofing for higher load or concurrent rail sharing is required; otherwise LM3671TLX-1.8/NOPB offers better cost-efficiency fit. |
Compared with TPS62231DRYR and AP63202WU-18, LM3671TLX-1.8/NOPB uniquely balances ultra-low PFM IQ (16 µA), integrated soft-start, and minimal external component count (3 parts) in a thermally enhanced USON package - making it optimal for space-constrained, battery-sensitive portable designs where efficiency across full load range matters.
Availability
LM3671TLX-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-term manufacturability, and automotive-grade reliability assurance.
Supply support for LM3671TLX-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 leader specializing in analog, embedded processing, and power management technologies - serving industrial, automotive, and consumer markets with high-reliability silicon solutions.
The LM3671 product line delivers highly integrated, low-quiescent-current DC-DC converters for portable battery-powered systems - designed specifically to replace linear regulators and extend runtime in space-constrained handheld devices.
FAQ
What is the recommended input capacitor for LM3671TLX-1.8/NOPB?
The LM3671TLX-1.8/NOPB datasheet specifies a minimum 4.7 µF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins. TI recommends using a 10 µF capacitor for improved line transient response and reduced input ripple, especially when operating near the 2.7 V lower input limit. The capacitor must have low ESR (<100 mΩ) and be rated for ≥6.3 V.
Does LM3671TLX-1.8/NOPB require external feedback resistors?
No, LM3671TLX-1.8/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider set for 1.8 V regulation. The FB pin connects directly to the output capacitor node, and the internal 0.5 V reference and feedback network ensure ±4% output accuracy across temperature and load - simplifying design and reducing BOM count.
What is the thermal performance of LM3671TLX-1.8/NOPB in USON package?
LM3671TLX-1.8/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. With its exposed thermal pad soldered to a solid ground plane, it sustains 600 mA continuous output at ambient temperatures up to 85°C without derating - verified by TI's thermal characterization data in SNVS294S Rev S.
Can LM3671TLX-1.8/NOPB operate from a single alkaline cell?
No, LM3671TLX-1.8/NOPB cannot reliably operate from a single alkaline cell. Its absolute minimum input voltage is 2.7 V, while a fresh alkaline cell starts at ~1.6 V and drops rapidly under load. It is explicitly designed for single Li-Ion (3.0–4.2 V), Li-Polymer, or regulated 3.3 V/5 V rails - not primary battery chemistries with lower nominal voltage.
How does the soft-start function work on LM3671TLX-1.8/NOPB?
The LM3671TLX-1.8/NOPB implements hardware-based soft-start by progressively increasing the internal switch current limit in four discrete steps: 70 mA → 140 mA → 280 mA → 1020 mA (typical). This occurs only when EN transitions high after VIN reaches ≥2.7 V, limiting inrush current into the output capacitor and preventing input rail sag - typical startup time is 275 µs (1 mA load) to 400 µs (300 mA load) with 10 µF COUT.
LM3671TLX-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3671TLX-1.8/NOPB FAQ
1.How can I place an order for LM3671TLX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-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 LM3671TLX-1.8/NOPB reliable?
The price and inventory of LM3671TLX-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 LM3671TLX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-1.8/NOPB?
LM3671TLX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-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 LM3671TLX-1.8/NOPB?
For technical support, including LM3671TLX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-1.8/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-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 LM3671TLX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-1.8/NOPB?
All LM3671TLX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-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 LM3671TLX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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