LM3671TL-3.3 Texas Instruments Integrated Circuit (Other) In Stock
The LM3671TL-3.3 is a step-down DC-DC switching regulator from Texas Instruments with a fixed 3.3V output in a 5-ball DSBGA package. It accepts 2.7V to 5.5V input and supports PWM and PFM modes for efficient battery-powered designs. Available worldwide with in-stock shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LM3671TL-3.3 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -30.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM3671TL-3.3?
- Fixed 3.3V regulated output from 2.7V to 5.5V input enabling direct Li-ion to 3.3V conversion
- Dual PWM and PFM control modes extending battery life at light loads through pulse frequency modulation
- Voltage-mode PWM control delivering stable regulation across full load range
- Ultra-compact 5-ball DSBGA package occupying minimal PCB footprint for space-constrained designs
- 2.7V minimum input suits single Li-ion cell operation down to near-depleted battery voltage
What is LM3671TL-3.3 used for?
The LM3671TL-3.3 is optimized for battery-powered portable devices such as smartphones, wearables, and Bluetooth modules where a single Li-ion cell must power a 3.3V logic rail efficiently. Its PFM mode at light loads reduces quiescent current consumption, extending standby time in IoT sensors and wireless nodes. The tiny DSBGA footprint fits within tightly constrained wearable PCBs alongside RF transceivers and MEMS sensors.
What are the specifications of LM3671TL-3.3?
| Pbfree Code | No |
| YTEOL | 0 |
| Additional Feature | PULSE FREQUENCY MODULATION TECHNIQUE IS ALSO POSSIBLE |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 2.7V |
| Input Voltage-Nom | 3.6V |
| JESD-30 Code | R-PBGA-B5 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Output Current-Max | 1.15A |
| Output Voltage-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | BGA5,2X3,20 |
| Package Shape | RECTANGULAR |
| Package Style | GRID ARRAY, VERY THIN PROFILE, FINE PITCH |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 2600kHz |
| Temperature Grade | OTHER |
| Terminal Finish | TIN LEAD |
| Terminal Form | BALL |
| Terminal Pitch | 0.5mm |
| Terminal Position | BOTTOM |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM3671TL-3.3 datasheet?
LM3671TL-3.3 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM3671TL-3.3?
Compatible alternatives and drop-in replacements for LM3671TL-3.3:
Switching Regulator, Voltage-mode, 0.6A, 2600kHz Switching Freq-Max, PBGA5
Frequently Asked Questions
How does PFM mode in LM3671TL-3.3 extend battery life in IoT standby applications?
In PFM mode, the LM3671TL-3.3 fires switching pulses only when the output voltage droops below threshold, reducing switching losses to near zero at light loads below 10 mA. This lowers quiescent current from hundreds of microamps in continuous PWM down to tens of microamps, potentially doubling standby runtime for a 200 mAh coin-cell-backed IoT sensor node.
What input voltage range does LM3671TL-3.3 accept and how does that match Li-ion discharge curves?
The regulator accepts 2.7V to 5.5V input, which covers the full discharge curve of a single Li-ion cell from 4.2V fully charged down to the 2.7V cutoff. This eliminates the need for a boost stage in single-cell systems, keeping the power path simple and efficient while the fixed 3.3V output remains stable across the 1.5V input range variation.
For a compact wearable PCB, how does the DSBGA package of LM3671TL-3.3 compare to SOT-23 alternatives?
The 5-ball DSBGA measures approximately 1 x 1 mm with a 0.5 mm ball pitch, occupying roughly 1 mm2 versus 8 mm2 for a comparable SOT-23-5 package. This 8x area reduction is significant for wrist-worn or in-ear devices where total PCB area is under 200 mm2, enabling a complete 3.3V buck converter with just a 1 µH inductor and two ceramic capacitors in under 15 mm2.
At what output current level should a designer switch from LM3671TL-3.3 to a higher-current buck regulator?
The LM3671TL-3.3 is rated for up to 600 mA continuous output current at 3.3V. Applications drawing more than 500 mA continuously, such as driving a display with backlight and RF radio simultaneously, should consider the LM3674 or LM3678 family rated at 1A or higher to maintain efficiency above 85% and avoid thermal derating in the small DSBGA package.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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