LP3893ES-1.8 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments LP3893ES-1.8 is a 3A fast-transient LDO linear regulator with a fixed 1.8V output in a compact SOT-223 package. Key specs: input voltage up to 6V, dropout voltage ~300 mV at 3A, fast 10 µs transient response. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Lifecycle
- ACTIVE
- Datasheet
- LP3893ES-1.8 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3A continuous output current with only 300 mV dropout at full load, enabling efficient 1.8V regulation from a 2.1V minimum input rail
- Fast transient response of 10 µs settling time for 1A load steps, critical for powering FPGAs and DSPs with dynamic current demands
- Fixed 1.8V output eliminates external resistors and reduces BOM, simplifying layout and improving output accuracy to within ±2% across -40°C to +125°C
- SOT-223 package with exposed pad enables efficient thermal dissipation up to 2W, allowing full 3A operation without additional heatsinking in still air
Applications
The LP3893ES-1.8 is designed for powering 1.8V digital cores in FPGAs, DSPs, and application processors where fast load transients up to 3A demand a regulator that settles within 10 µs. Its low 300 mV dropout makes it an efficient post-regulator following a 3.3V bus, minimizing heat dissipation in battery-operated and space-constrained embedded systems. Telecommunications equipment, industrial controllers, and high-speed communications boards also use it to supply 1.8V I/O banks with stable, low-noise voltage.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the minimum input voltage required to maintain a regulated 1.8V output at 3A from the LP3893ES-1.8?
The LP3893ES-1.8 has a dropout voltage of approximately 300 mV at 3A load, requiring a minimum input voltage of 2.1V to maintain a regulated 1.8V output. When powered from a 3.3V rail there is 1.2V of headroom, meaning the power dissipation across the LDO at full 3A load is 3.6W, which must be managed through the SOT-223 package's thermal path.
How quickly does the LP3893ES-1.8 respond to fast load transients, and why does this matter for FPGA power supplies?
The LP3893ES-1.8 settles within approximately 10 µs following a 1A load step, keeping the 1.8V output within ±5% during dynamic current events. FPGAs can draw transient currents exceeding 1A in under 100 ns during configuration or high-speed switching, so the fast response prevents under-voltage glitches that could corrupt initialization or cause logic errors in voltage-sensitive I/O banks.
What thermal dissipation capability does the LP3893ES-1.8 SOT-223 package provide, and how does that constrain maximum load current?
The SOT-223 package has a thermal resistance of approximately 45°C/W junction to board with an exposed pad soldered to the PCB copper. At a 125°C junction temperature limit and a 25°C ambient, the package can dissipate up to 2.2W continuously. With a 3.3V input and 1.8V output, the 1.5V dropout across 3A load produces 4.5W, so a heatsink pad or at least 1 in² of 2 oz copper is needed to keep junction temperature below 125°C.
How does the LP3893ES-1.8 output accuracy vary across its full temperature range?
The fixed 1.8V output of the LP3893ES-1.8 maintains accuracy within ±2% across the -40°C to +125°C industrial temperature range, meaning the output stays between 1.764V and 1.836V under stable load conditions. This precision is sufficient to meet the 5% tolerance bands of most 1.8V LVCMOS and DDR memory I/O specifications without additional trimming or external components.
When would the LP3893ES-1.8 be a better choice than a switching regulator for a 3.3V to 1.8V conversion on a PCB?
The LP3893ES-1.8 is preferred over a switching regulator when output noise must stay below 50 µV RMS and PCB area is limited to less than 50 mm², as it requires only 3 external components versus 8-12 for a typical buck converter. At load currents below 1.5A the efficiency penalty of the 1.5V dropout is acceptable, and the LDO's absence of switching noise makes it ideal for analog-to-digital converter reference rails and RF transceiver supply lines.
Related Guides
LM2904BQDGKRQ1 Selection Guide: Automotive Dual Op-Amp Variants, Packages, and Alternatives
How to choose the right LM2904BQ automotive dual op-amp variant: AEC-Q100 grade, offset voltage, package, and non-automotive alternatives explained.
May 27, 2026
ST3232CDR vs ST3232 Variants: RS-232 Transceiver Selection Guide
How to choose the right ST3232 RS-232 transceiver variant: compare ST3232CDR, ST3232BDR, ST3232BTR, ST3232CTR, and ST3232EBDR by supply voltage, package, temperature, and ESD rating.
May 27, 2026
ST3232CDR RS-232 Transceiver: Application Note & Design Guide
Complete design guide for the ST3232CDR RS-232 transceiver: charge-pump capacitor selection, PCB layout, ESD protection, and circuit examples for 3.3 V systems.
May 26, 2026
TPS613222ADBVR Selection Guide: How to Choose the Right Low-Power Boost Converter
How to choose between TPS613221ADBVR, TPS613222ADBVR, and TPS613223ADBVR: key parameters include quiescent current, output voltage, and switch current rating.
May 26, 2026
Why Buy from FindMyChip
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.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”