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Texas Instruments LM3671TLX-2.5/NOPB
- Part No.:
- LM3671TLX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
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Product details
Overview
LM3671TLX-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 600-mA synchronous step-down DC-DC converter in a 2.0 mm × 2.0 mm USON-6 package. It operates from 2.7 V to 5.5 V input, delivers 2-MHz PWM switching with automatic PFM-PWM mode transition, and features 16 µA quiescent current and 0.01 µA shutdown current. It powers core logic rails in mobile phones and portable instrumentation requiring compact, high-efficiency regulation from single Li-ion cells.
For engineers reviewing the LM3671TLX-2.5/NOPB datasheet, LM3671TLX-2.5/NOPB pinout, LM3671TLX-2.5/NOPB application, or LM3671TLX-2.5/NOPB equivalent, key selection considerations include output voltage accuracy (±2.5% over temperature), thermal performance in USON-6 (RθJA = 174.7°C/W), internal synchronous rectification, soft-start behavior, and compatibility with 2.2 µH inductors and ceramic capacitors.
Technical Context
The LM3671TLX-2.5/NOPB implements a voltage-mode PWM controller with input voltage feed-forward compensation, enabling stable regulation across 2.7–5.5 V input while maintaining tight line regulation (0.031%/V). Its dual-mode operation-PWM at ≥80 mA load and hysteretic PFM below-dynamically optimizes efficiency without external mode control.
Internal synchronous rectification uses matched PFET/NFET switches (RDS(ON) = 380/250 mΩ typical) to eliminate external diode losses. The 0.5 V internal reference feeds a precision error amplifier that regulates FB to maintain 2.5 V output via fixed internal resistor divider; no external feedback components are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% over –40°C to +125°C; eliminates need for external feedback resistors. |
| Max Output Current | 600 mA continuous; supports power-hungry digital cores in portable devices. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp); enables use of 2.2 µH inductor and small 10 µF ceramic output capacitor. |
| Quiescent Current | 16 µA typical in PFM mode; extends battery life during standby in handheld instruments. |
| Shutdown Current | 0.01 µA typical; reduces system leakage when powered off. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with single Li-ion (3.0–4.2 V) and USB-powered (5 V) systems. |
| Thermal Resistance | RθJA = 174.7°C/W (USON-6 on 4-layer board); defines maximum ambient temperature derating for 600 mA loads. |
Pinout & Package
LM3671TLX-2.5/NOPB is housed in a 2.00 mm × 2.00 mm, 0.5 mm profile USON-6 (NKH) package with wettable flanks and exposed thermal pad (pin 6 = SGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V; supplies internal bias and switch drivers. |
| GND (Pin 2) | Power Ground | Main return path for input capacitor and high-current PFET/NFET switching loop. |
| EN (Pin 3) | Digital Enable | Active-high logic control; device enabled at >1 V, shutdown at <0.4 V; must not float. |
| FB (Pin 4) | Feedback Input | Internally connected to fixed 2.5 V divider; tied directly to VOUT for regulation; no external resistors needed. |
| SW (Pin 5) | Switch Node | Drives external inductor; connects internally to PFET drain and NFET source; requires low-inductance layout. |
| SGND (Pin 6) | Signal Ground | Separate ground for FB amplifier; must be connected to GND near device for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM-PWM mode switching | Enables 16 µA quiescent current at light load and seamless transition to 2-MHz PWM at ≥80 mA, optimizing efficiency across full load range. |
| Internal synchronous rectification | Integrates matched PFET (380 mΩ) and NFET (250 mΩ) switches, eliminating external Schottky loss and improving full-load efficiency by ~8% vs diode-based designs. |
| Internal soft-start | Staged current limit ramp (70 → 140 → 280 → 1020 mA) prevents inrush into 10 µF output caps; typical start-up time is 400 µs at 300 mA load. |
| Thermal and overload protection | Thermal shutdown engages at 150°C (typical) and releases at 130°C; cycle-by-cycle current limit trips at 1020 mA (open-loop), protecting inductor and MOSFETs. |
| Ultra-low shutdown current | 0.01 µA typical shutdown supply current minimizes battery drain in always-on portable systems with periodic wake-up cycles. |
Applications
| Mobile Phone Baseband Core | Portable Medical Sensor Module |
|---|---|
Use Scenario: Powers ARM Cortex-A53 application processor core rail in slim smartphone design with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 2.5 V buck regulator delivering up to 600 mA with 2-MHz switching to minimize EMI in RF-sensitive layout. Use Value: Fixed 2.5 V output eliminates feedback resistor placement errors; USON-6 footprint saves PCB area versus SOT-23 alternatives. | Use Scenario: Supplies analog front-end and low-power MCU in handheld blood glucose meter operating 24/7 on coin cell + boost stage. IC Role / Device Role / Timing Role: Efficient 2.5 V intermediate rail generator enabling precise ADC reference and sensor biasing. Use Value: 16 µA PFM quiescent current extends battery life beyond 12 months; thermal shutdown protects against enclosure overheating. |
| WLAN IoT Edge Node | Digital Still Camera Image Processor |
Use Scenario: Provides clean 2.5 V supply to 2.4 GHz Wi-Fi SoC during burst transmit/receive cycles in battery-powered smart home hub. IC Role / Device Role / Timing Role: High-transient-response buck converter maintaining regulation during 0.5–500 mA load steps with <50 µs recovery. Use Value: Automatic PFM-to-PWM mode switching ensures fast transient response without external mode pin control or firmware intervention. | Use Scenario: Powers image signal processor (ISP) in compact point-and-shoot camera with mechanical shutter and LCD display. IC Role / Device Role / Timing Role: Main 2.5 V power rail supporting ISP core, memory interface, and auto-focus driver circuits. Use Value: Internal soft-start prevents voltage droop on shared battery rail during camera power-on sequence; only three external passives required. |
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 2.5 V, 600 mA, 3-MHz switching, 17 µA IQ, WSON-6 (2.0 × 2.0 mm) | Slightly higher switching frequency enables smaller inductor; lacks PFM mode hysteresis tuning | Preferred where higher-frequency EMI filtering is acceptable and tighter output ripple (<10 mVPP) is required. |
| AP63202WS-7 | Fixed 2.5 V, 2-A, 2-MHz, 25 µA IQ, TSOT23-6 (2.9 × 1.6 mm) | Higher current rating and larger SOT-23 package; no integrated soft-start ramp | Selected when future-proofing for higher load growth or when board space allows larger footprint for thermal margin. |
Compared with TPS62231DRYR and AP63202WS-7, LM3671TLX-2.5/NOPB offers superior light-load efficiency via intelligent PFM hysteresis and lower shutdown current (0.01 µA vs ≥0.1 µA), making it optimal for ultra-low-power portable systems with intermittent active periods.
Availability
LM3671TLX-2.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical equipment, and WLAN IoT edge nodes requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LM3671TLX-2.5/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LM3671 product line delivers highly integrated, miniature buck converters optimized for space-constrained portable electronics powered by single-cell Li-ion batteries or 3.3/5 V rails.
FAQ
What is the recommended input capacitor for LM3671TLX-2.5/NOPB?
The LM3671TLX-2.5/NOPB datasheet specifies a minimum 4.7 µF X5R/X7R ceramic input capacitor placed close to VIN and GND pins. TI recommends using a 10 µF/6.3 V X5R capacitor for improved line transient response and reduced input ripple under 600 mA load conditions. This value ensures sufficient charge reservoir during high-frequency switching and maintains stability across temperature and DC bias.
Does LM3671TLX-2.5/NOPB require an external feedback resistor network?
No, LM3671TLX-2.5/NOPB does not require external feedback resistors. It integrates a precision internal resistor divider calibrated for 2.5 V output, connecting FB internally to the regulated node. The FB pin must be connected directly to the output capacitor's VOUT node; adding external resistors will disrupt regulation and cause output voltage error.
What is the thermal shutdown behavior of LM3671TLX-2.5/NOPB?
LM3671TLX-2.5/NOPB activates thermal shutdown at approximately 150°C junction temperature and resumes normal operation once the junction cools to ~130°C. During shutdown, the device halts switching, disables both PFET and NFET, and draws only 0.01 µA from VIN. Recovery is automatic and does not require cycling EN; however, sustained high ambient temperatures may cause repeated cycling if PCB thermal design exceeds RθJA limits.
Can LM3671TLX-2.5/NOPB operate with a 2.2 µH inductor?
Yes, LM3671TLX-2.5/NOPB is specifically characterized and validated for use with a 2.2 µH shielded power inductor (e.g., TDK VLS201610ET-2R2M). This value provides optimal balance of peak current ripple (~30% of IOUT), size, and efficiency at 2-MHz switching. Using inductors outside 1.5–3.3 µH may degrade transient response or increase output ripple beyond specification.
Is LM3671TLX-2.5/NOPB qualified for automotive applications?
No, LM3671TLX-2.5/NOPB is not AEC-Q100 qualified. Only the LM3671-Q1 variant (e.g., LM3671QTLX-2.5/NOPB) carries automotive qualification-Grade 1 (–40°C to +125°C ambient), HBM ±2000 V, and CDM ±500 V. LM3671TLX-2.5/NOPB is rated for commercial/industrial use (–40°C to +85°C ambient) and lacks automotive-specific reliability testing and traceability.
LM3671TLX-2.5/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):
- 2.5V
- 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-2.5/NOPB FAQ
1.How can I place an order for LM3671TLX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-2.5/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-2.5/NOPB reliable?
The price and inventory of LM3671TLX-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-2.5/NOPB?
LM3671TLX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-2.5/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-2.5/NOPB?
For technical support, including LM3671TLX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-2.5/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-2.5/NOPB?
All LM3671TLX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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