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Texas Instruments LM3671TL-1.8/NOPB
- Part No.:
- LM3671TL-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:707
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Product details
Overview
LM3671TL-1.8/NOPB from Texas Instruments is a fixed-output 1.8 V, 600-mA synchronous step-down DC-DC converter in a 6-pin USON package (2.0 mm × 2.0 mm), operating from 2.7 V to 5.5 V input with 2 MHz fixed-frequency PWM and automatic PFM mode switching. It delivers regulated power to low-voltage subsystems in portable electronics using only three external components: one 2.2 µH inductor and two ceramic capacitors.
For engineers reviewing the LM3671TL-1.8/NOPB datasheet, LM3671TL-1.8/NOPB pinout, LM3671TL-1.8/NOPB application, or LM3671TL-1.8/NOPB equivalent, key selection considerations include its 16 µA typical quiescent current in PFM mode, 0.01 µA shutdown current, internal synchronous rectification, soft-start functionality, and thermal/overcurrent protection - all critical for battery-powered mobile and automotive applications requiring high efficiency and small footprint.
Technical Context
The LM3671TL-1.8/NOPB implements 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 adjust duty cycle via a 2 MHz oscillator and PWM comparator.
It operates in three distinct functional modes: PWM (≥80 mA load, fixed 2 MHz switching), PFM (light-load, variable frequency, 16 µA IQ), and shutdown (0.01 µA ISHDN). Mode transitions are fully automatic and based on inductor zero-current detection and peak switch current thresholds - no external control required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% (TL grade); enables direct powering of 1.8 V I/O rails without external feedback resistors. |
| Max Output Current | 600 mA continuous; supports demanding digital loads like baseband processors or RF transceivers in handheld devices. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with single Li-Ion (3.0–4.2 V), Li-Polymer, or 3.3 V/5 V system rails. |
| Switching Frequency | 2 MHz (typical); allows use of ultra-small 2.2 µH inductors and 10 µF ceramic output capacitors for compact PCB layout. |
| Quiescent Current | 16 µA (typical, PFM mode); extends battery runtime during standby or low-activity states in portable instruments. |
| Shutdown Current | 0.01 µA (typical); minimizes leakage drain when system is powered off - critical for always-on sensor nodes. |
| Internal FET RDS(ON) | PFET: 380–500 mΩ; NFET: 250–400 mΩ; enables >90% peak efficiency at mid-load without external MOSFETs. |
Pinout & Package
LM3671TL-1.8/NOPB uses the NKH 6-pin USON package (2.00 mm × 2.00 mm, 0.5 mm pitch), optimized for space-constrained portable designs. Thermal performance is characterized by RθJA = 174.7°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply; must be ≥2.7 V before enabling. |
| GND (Pin 2) | Ground Reference | Primary power ground; requires low-impedance connection to minimize noise coupling into feedback path. |
| EN (Pin 3) | Digital Enable | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; must not float. |
| FB (Pin 4) | Feedback Input | Internally connected to 1.8 V divider; tied directly to VOUT for fixed-output operation - no external resistors needed. |
| SW (Pin 5) | Switch Node | Connection to internal PFET drain and NFET source; drives external inductor; requires tight layout to reduce EMI. |
| SGND (Pin 6) | Signal Ground | Separate analog ground for FB reference; should be connected to GND near FB pin to avoid noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Enables seamless transition between high-efficiency light-load operation (16 µA IQ) and low-noise full-load regulation (2 MHz PWM) without external control logic. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by up to 12% vs. asynchronous buck at 1.8 V/300 mA. |
| Integrated soft-start | Gradually ramps current limit (70 → 140 → 280 → 1020 mA) during startup to prevent inrush current spikes into 10 µF output capacitors. |
| Thermal & overcurrent protection | Shuts down at ~150°C junction temperature and limits peak switch current to 1020 mA (open-loop), preventing damage under fault conditions. |
| Ultra-low shutdown current | 0.01 µA typical draw ensures negligible battery drain during extended storage or system sleep - essential for medical wearables and IoT edge sensors. |
Applications
| Mobile Phone Power Management | Automotive Infotainment Core Supply |
|---|---|
Use Scenario: Powers 1.8 V I/O banks and memory interfaces in LTE smartphones during active call and data transmission. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 1.8 V from a shared 3.6 V Li-Ion rail; handles dynamic load steps up to 600 mA with <1% output deviation. Use Value: 2 MHz switching avoids AM radio band interference; PFM mode extends talk time by 18% versus fixed-frequency-only converters under standby. | Use Scenario: Supplies 1.8 V core voltage to DSPs and audio codecs in automotive head units operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Fixed-output buck converter with AEC-Q100 Grade 1 qualification (LM3671-Q1 variant); provides stable rail despite battery transients (load dump, cold crank). Use Value: Internal thermal shutdown (150°C trip) and 165.7°C/W RθJA ensure reliability in sealed enclosures; 0.5 V internal reference enables precise 1.8 V output tolerance. |
| Portable Medical Sensor Hub | Wireless Home-Automation Gateway |
Use Scenario: Powers low-power microcontrollers and analog front-ends in FDA-cleared wearable ECG monitors running on coin-cell or Li-Po batteries. IC Role / Device Role / Timing Role: Efficient 1.8 V supply enabling >7-day battery life; operates in PFM mode during sensor sampling intervals (10 mA avg load). Use Value: 16 µA quiescent current directly increases operational runtime; soft-start prevents false resets during wake-from-sleep sequences. | Use Scenario: Regulates 1.8 V for Zigbee/Thread SoCs and flash memory in battery-backed smart home hubs with 24/7 connectivity requirements. IC Role / Device Role / Timing Role: Always-on DC-DC converter supporting rapid wake-up from deep sleep (<100 µs start-up time with 10 µF COUT); maintains rail stability during BLE packet bursts. Use Value: 0.01 µA shutdown current preserves battery charge over months of standby; 2.2 µH inductor enables BOM cost reduction vs. larger magnetics. |
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; 6-pin WSON (2.0 × 2.0 mm) - identical footprint but higher fSW. | Higher switching frequency enables smaller inductors but increases EMI sensitivity; lacks SGND pin separation. | Choose for designs needing faster transient response or tighter size constraints where EMI filtering is already implemented. |
| AP63202WU-18 | Fixed 1.8 V, 2 A, 2 MHz, 25 µA IQ; 8-pin WLCSP (1.5 × 1.5 mm); includes power-good flag and adjustable soft-start. | Higher current rating and integrated PG signal support more complex power sequencing; smaller package demands finer-pitch assembly. | Choose when future-proofing for higher load growth or requiring system-level power status monitoring. |
Compared with TPS62231DRYR and AP63202WU-18, the LM3671TL-1.8/NOPB offers optimal balance of ultra-low IQ (16 µA), proven thermal robustness in USON, and minimal external component count - making it ideal for cost-sensitive, space-constrained portable designs where 600 mA suffices and layout simplicity is prioritized.
Availability
LM3671TL-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical equipment, and wireless home-automation gateways requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM3671TL-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 ICs, with decades of expertise in high-efficiency DC-DC conversion for portable and automotive markets.
The LM3671 product line was designed specifically for space- and power-constrained portable electronics, delivering high integration, low quiescent current, and robust protection features in miniature packages - targeting battery-powered systems where runtime, size, and reliability are paramount.
FAQ
What is the recommended input capacitor for LM3671TL-1.8/NOPB?
The LM3671TL-1.8/NOPB datasheet specifies a 4.7 µF ceramic input capacitor (X5R or X7R, 6.3 V rating) 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 generated at the SW node. Larger values (e.g., 10 µF) may improve line transient response but are not required for basic functionality of the LM3671TL-1.8/NOPB.
Does LM3671TL-1.8/NOPB require an external feedback resistor network?
No, the LM3671TL-1.8/NOPB is a fixed-output variant with internal resistor dividers configured for 1.8 V. The FB pin is internally connected to the output voltage divider, so it must be connected directly to the VOUT net - no external resistors are needed or permitted. Using external resistors would disrupt regulation and is incompatible with the LM3671TL-1.8/NOPB's factory-trimmed feedback architecture.
What thermal derating applies to LM3671TL-1.8/NOPB at 85°C ambient?
At 85°C ambient temperature on a 4-layer PCB, the LM3671TL-1.8/NOPB's maximum power dissipation is derated to 242 mW (per RθJA = 174.7°C/W). This corresponds to approximately 400 mA output current at 1.8 V with typical efficiency (~92%), assuming no additional board-level heatsinking. Exceeding this limit risks thermal shutdown activation at ~150°C junction temperature.
Can LM3671TL-1.8/NOPB operate from a 2.5 V input supply?
No - the LM3671TL-1.8/NOPB has a minimum input voltage of 2.7 V per its Recommended Operating Conditions. At 2.5 V, the device will not regulate properly and may enter undervoltage lockout (UVLO), disabling switching. For 2.5 V input compatibility, consider the LM3671MF-1.8/NOPB (same family, MF grade) or alternative regulators rated down to 2.3 V, but note that LM3671TL-1.8/NOPB itself is not specified for operation below 2.7 V.
How does the soft-start function behave during repeated enable/disable cycles of LM3671TL-1.8/NOPB?
The LM3671TL-1.8/NOPB initiates soft-start only on the first rising edge of EN after VIN reaches ≥2.7 V. Subsequent toggling of EN (e.g., rapid on/off cycling) does not re-trigger soft-start - the device resumes regulation immediately using the existing inductor current state. This behavior prevents unnecessary delay during dynamic power gating but requires careful sequencing if downstream circuits are sensitive to inrush during repeated enable events involving the LM3671TL-1.8/NOPB.
LM3671TL-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)
LM3671TL-1.8/NOPB FAQ
1.How can I place an order for LM3671TL-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-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 LM3671TL-1.8/NOPB reliable?
The price and inventory of LM3671TL-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 LM3671TL-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-1.8/NOPB?
LM3671TL-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-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 LM3671TL-1.8/NOPB?
For technical support, including LM3671TL-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-1.8/NOPB requirements.
6.How does Aetrix verify that LM3671TL-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-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 LM3671TL-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-1.8/NOPB?
All LM3671TL-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-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 LM3671TL-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671TL-1.8/NOPB Tags
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