LM3678SDE-1.2 Texas Instruments Integrated Circuit (Small Outline No-lead) In Stock
Texas Instruments LM3678SDE-1.2 is a voltage-mode PWM step-down switching regulator delivering a fixed 1.2 V output at up to 1.5 A from a 2.5 V to 5.5 V input in a compact WSON-10 package. Operating at 3.6 MHz switching frequency, it minimizes external inductor size and fits space-constrained portable designs. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline No-lead
- Pin Count
- 10
- Lifecycle
- OBSOLETE
- Datasheet
- LM3678SDE-1.2 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 LM3678SDE-1.2?
- High 3.6 MHz switching frequency reduces external inductor to under 1 µH, enabling ultra-compact PCB footprints
- Fixed 1.2 V output up to 1.5 A suits DDR termination and low-core-voltage FPGA/SoC rails directly
- Wide input range 2.5 V to 5.5 V covering single-cell Li-ion, 3.3 V bus, and 5 V USB sources
- WSON-10 package with exposed pad provides low thermal resistance for efficient heat dissipation in dense layouts
What is LM3678SDE-1.2 used for?
The LM3678SDE-1.2 is ideal for generating 1.2 V core supply rails in portable electronics, solid-state drives, and wireless modules powered from Li-ion batteries or 3.3 V system buses. The 3.6 MHz switching frequency allows use of ceramic inductors below 1 µH, reducing total solution height below 1.5 mm for ultra-thin handheld designs. It also suits FPGA and DSP core voltage applications in telecom line cards where the 1.5 A current capacity handles typical static and dynamic load demands.
What are the specifications of LM3678SDE-1.2?
| YTEOL | 0 |
| Additional Feature | ALSO OPERATES WITH 1.2V OUTPUT VOLTAGE |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 2.5V |
| Input Voltage-Nom | 3.6V |
| JESD-30 Code | S-XDSO-N10 |
| Number of Functions | 1 |
| Output Current-Max | 2.4A |
| Output Voltage-Nom | 0.8V |
| Package Body Material | UNSPECIFIED |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 3600kHz |
| Technology | CMOS |
| Temperature Grade | OTHER |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Package | Small Outline No-lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM3678SDE-1.2 datasheet?
LM3678SDE-1.2 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM3678SDE-1.2?
Compatible alternatives and drop-in replacements for LM3678SDE-1.2:
Switching Regulator, Voltage-mode, 1.5A, 3600kHz Switching Freq-Max, CMOS, PDSO10
Frequently Asked Questions
Why does the 3.6 MHz switching frequency of LM3678SDE-1.2 matter for PCB layout size?
At 3.6 MHz, the LM3678SDE-1.2 requires an inductor as small as 0.47 µH to maintain stable operation, compared to 10 µH or more at 300 kHz regulators. This reduces the inductor footprint by approximately 70% and allows the entire power stage to fit within a 25 mm² area, which is critical for space-constrained designs like M.2 cards and smartwatches.
How much output current can LM3678SDE-1.2 supply at 1.2 V for FPGA core power?
The LM3678SDE-1.2 delivers up to 1.5 A continuous output current at 1.2 V, with peak current limiting set at approximately 2.2 A to protect against short circuits. This is sufficient for low-to-mid density FPGAs with core currents under 1 A and leaves 500 mA headroom for other loads on the same rail.
Can LM3678SDE-1.2 operate directly from a single-cell Li-ion battery through its discharge cycle?
Yes, the LM3678SDE-1.2 accepts input voltages from 2.5 V to 5.5 V, which covers the full discharge range of a single-cell Li-ion battery from 4.2 V (fully charged) down to approximately 2.8 V (near cutoff). This allows the device to deliver a stable 1.2 V output throughout the battery life without a separate boost stage, simplifying the power tree in portable designs.
What thermal performance does the WSON-10 package provide compared to a standard SOIC package?
The WSON-10 package features an exposed thermal pad that achieves a junction-to-board thermal resistance of approximately 30°C/W, versus 80°C/W or more for a comparable SOIC package without a thermal pad. At 1.5 A output with 5 V input and 1.2 V output, this means the IC junction temperature rise above a 25°C board is only about 12°C, well within the 150°C maximum junction temperature limit.
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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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