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Texas Instruments LM3671TL-2.5/NOPB
- Part No.:
- LM3671TL-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
LM3671TL-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It delivers up to 600 mA load current with 16 µA typical quiescent current in PFM mode, internal soft start, and integrated PFET/NFET power switches - enabling compact 3-component designs (inductor + 2 ceramic capacitors) in mobile phones and handheld instruments.
For engineers reviewing the LM3671TL-2.5/NOPB datasheet, LM3671TL-2.5/NOPB pinout, LM3671TL-2.5/NOPB application, or LM3671TL-2.5/NOPB equivalent, key selection criteria include its 2.7–5.5 V input range, 2.5 V ±2.5% output accuracy over temperature, automatic PWM/PFM mode switching, thermal shutdown protection, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671TL-2.5/NOPB employs voltage-mode control with input-voltage feed-forward compensation to maintain stable regulation across 2.7–5.5 V input and 0–600 mA load. Its 2-MHz fixed-frequency PWM operation ensures minimal output ripple and small external component size, while hysteretic PFM mode activates below ~80 mA to reduce quiescent current to 16 µA.
Internal synchronous rectification uses a dedicated NFET switch (RDSON ≤ 400 mΩ at 3.6 V) paired with the main PFET (RDSON ≤ 500 mΩ), eliminating external diode losses. Feedback is referenced to a precision 0.5 V internal bandgap, with the FB pin internally connected to a fixed resistor divider for 2.5 V output - no external resistors 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 and simplifies layout. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct operation from single Li-Ion (3.0–4.2 V) or regulated 3.3 V/5 V rails. |
| Max Output Current | 600 mA continuous - sufficient for core logic, RF transceivers, and display drivers in portable systems. |
| Switching Frequency | 2 MHz (typical, ±20% over temp) - enables use of 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for ultra-compact footprint. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby/sleep states in always-on peripherals. |
| Shutdown Current | 0.01 µA typical - reduces system-level leakage when disabled via EN pin. |
| Feedback Reference | 0.5 V internal bandgap - provides stable regulation reference independent of supply or load variation. |
Pinout & Package
LM3671TL-2.5/NOPB is housed in a 2.00 mm × 2.00 mm, 0.5 mm pitch, 6-pin USON (NKH) package with wettable flanks and exposed thermal pad. The package supports automated optical inspection (AOI) and offers 174.7°C/W junction-to-ambient thermal resistance 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; supplies internal bias and PFET gate drive. |
| GND (Pin 2) | Power ground | Main return path for input capacitor, inductor, and synchronous rectifier; ties to thermal pad. |
| EN (Pin 3) | Digital enable | Active-high logic input; device enabled at >1 V, shutdown at <0.4 V; must not be left floating. |
| FB (Pin 4) | Feedback sense | Internally connected to fixed 2.5 V divider; connect directly to output capacitor - no external resistors. |
| SW (Pin 5) | Switching node | Drives external inductor; connects to drain of internal PFET and source of internal NFET. |
| SGND (Pin 6) | Signal ground | Separate analog ground for feedback circuitry; tie to GND at single point near FB capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Transitions seamlessly at ~80 mA load to minimize IQ without external control - preserves light-load efficiency. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by >30% vs. asynchronous design at 2.5 V/300 mA. |
| Internal soft-start | Ramps current limit in 4 steps (70/140/280/1020 mA) to limit inrush; achieves 400 µs startup with 10 µF COUT + 300 mA load. |
| Thermal & overload protection | Thermal shutdown engages at TJ = 150°C (typical); cycle-by-cycle current limit trips at 1020 mA (open-loop). |
| Minimal external components | Requires only one 2.2 µH inductor and two ceramic caps (4.7 µF IN, 10 µF OUT) - reduces BOM count and board area. |
Applications
| Mobile Phone Power Rail | Portable Medical Sensor Supply |
|---|---|
|
Use Scenario: Powers baseband processor I/O and camera sensor interface from a single Li-Ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 2.5 V buck regulator delivering clean, low-noise DC power with fast transient response to dynamic load changes. Use Value: 2-MHz switching minimizes output voltage deviation during CPU burst activity; PFM mode extends standby time between charges. |
Use Scenario: Supplies 2.5 V to low-power analog front-end (AFE) and ADC in handheld ECG or pulse oximeter. IC Role / Device Role / Timing Role: Precision voltage source with tight output tolerance (±2.5%) and low 16 µA quiescent current for battery longevity. Use Value: Internal 0.5 V reference and fixed FB divider ensure stable 2.5 V output without calibration drift across temperature. |
| Wireless Audio Transceiver | Industrial Handheld Terminal |
|
Use Scenario: Provides regulated 2.5 V to Bluetooth/Wi-Fi SoC RF section and digital core in compact earbud or speaker. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter with integrated synchronous FETs to reduce heat in sealed enclosures. Use Value: USON-6 package (2.0 × 2.0 mm) fits tight spacing constraints; thermal shutdown prevents overheating during sustained TX bursts. |
Use Scenario: Powers barcode scanner module, touchscreen controller, and secure MCU in ruggedized retail or logistics terminal. IC Role / Device Role / Timing Role: Robust power management IC with undervoltage lockout, current limiting, and 125°C ambient rating. Use Value: Operates reliably from 2.7 V input - maintains regulation down to end-of-discharge Li-Ion voltage (≈2.8 V). |
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 | 2.5 V fixed, 3-MHz switching, 400 mA max, 1.2 µA shutdown current - smaller quiescent current but lower output current capability. | Preferred for ultra-low-power IoT sensors where <400 mA load and sub-µA shutdown dominate requirements. | Select TPS62231DRYR when minimizing sleep-mode battery drain is critical and peak load stays below 400 mA. |
| AP63202WU-7 | 2.5 V fixed, 2-MHz, 2 A max, 25 µA quiescent current - higher current rating and wider VIN (4.5–18 V), but larger SOT-563 package. | Suitable for industrial 12 V input systems requiring 2.5 V rail with margin for future load growth beyond 600 mA. | Choose AP63202WU-7 if input voltage exceeds 5.5 V or future-proofing for >600 mA loads is required - not drop-in compatible. |
Compared with TPS62231DRYR and AP63202WU-7, LM3671TL-2.5/NOPB delivers optimal balance of 600 mA capability, 16 µA light-load IQ, and USON-6 footprint for space-limited 2.7–5.5 V Li-Ion applications - making it ideal for next-gen portable consumer electronics where size, efficiency, and input range alignment are prioritized.
Availability
LM3671TL-2.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical devices, and wireless audio transceivers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3671TL-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable, automotive, and industrial markets.
The LM3671 product line delivers highly integrated, low-quiescent-current buck converters targeting battery-powered portable electronics - designed to minimize external component count while maintaining high efficiency across wide input and load ranges.
FAQ
What is the recommended input capacitor for LM3671TL-2.5/NOPB?
The LM3671TL-2.5/NOPB datasheet specifies a 4.7 µF ceramic capacitor (X5R/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. Larger values (e.g., 10 µF) may improve line transient response but are not required for basic functionality. LM3671TL-2.5/NOPB does not require bulk electrolytic capacitance due to its high PSRR and internal compensation.
Does LM3671TL-2.5/NOPB require external feedback resistors?
No. LM3671TL-2.5/NOPB is a fixed-output variant with an internal resistor divider connected to the FB pin, configured for 2.5 V ±2.5% output. The FB pin must be connected directly to the output capacitor's positive terminal - no external resistors are needed or permitted. Adding external resistors would disrupt regulation and is explicitly prohibited in the datasheet. LM3671TL-2.5/NOPB relies solely on its internal 0.5 V reference and factory-trimmed divider.
What is the thermal performance of LM3671TL-2.5/NOPB in USON-6 package?
In the USON-6 (NKH) package, LM3671TL-2.5/NOPB has a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W on a standard 4-layer PCB. At 600 mA output with 3.6 V input, typical power dissipation is ~180 mW, resulting in ~31°C junction-to-ambient rise - well within the 125°C max junction limit. The exposed thermal pad must be soldered to a solid copper pour for optimal heat transfer. LM3671TL-2.5/NOPB includes thermal shutdown that activates at ~150°C to prevent damage.
Can LM3671TL-2.5/NOPB operate from a 2.7 V input at full 600 mA load?
Yes. LM3671TL-2.5/NOPB is fully specified to deliver 600 mA continuously at VIN = 2.7 V and VOUT = 2.5 V, provided adequate thermal management is implemented. At this condition, efficiency drops to ~82% (per Figure 13), and dropout is maintained via low RDSON PFET/NFET switches (≤500 mΩ/≤400 mΩ). The device includes undervoltage lockout that disables operation below VIN < 2.7 V, ensuring reliable startup only when sufficient headroom exists. LM3671TL-2.5/NOPB sustains regulation down to the minimum rated input.
How does the automatic PWM-to-PFM transition work in LM3671TL-2.5/NOPB?
LM3671TL-2.5/NOPB transitions from PWM to PFM mode automatically when load current falls below ~80 mA for ≥32 consecutive switching cycles - detected by zero-crossing of inductor current and reduced peak switch current. In PFM mode, switching frequency decreases, quiescent current drops to 16 µA, and output voltage is regulated within ±0.6% to ±1.7% of nominal 2.5 V. The transition is seamless and requires no external configuration. LM3671TL-2.5/NOPB reverts to PWM instantly when load increases, ensuring fast transient response.
LM3671TL-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)
LM3671TL-2.5/NOPB FAQ
1.How can I place an order for LM3671TL-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-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 LM3671TL-2.5/NOPB reliable?
The price and inventory of LM3671TL-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 LM3671TL-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-2.5/NOPB?
LM3671TL-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-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 LM3671TL-2.5/NOPB?
For technical support, including LM3671TL-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-2.5/NOPB requirements.
6.How does Aetrix verify that LM3671TL-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-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 LM3671TL-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-2.5/NOPB?
All LM3671TL-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-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 LM3671TL-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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