LP3990TL-1.2 Texas Instruments In Stock
LP3990TL-1.2 is a 150 mA ultra-low-noise CMOS LDO linear regulator with fixed 1.2 V output by Texas Instruments. Key specs: 2.2 V to 5.5 V input range, 100 µA quiescent current, SOT-23-5 package. From $0.50, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LP3990TL-1.2?
- Fixed 1.2 V output with ultra-low 30 µVRMS output noise ideal for noise-sensitive RF and analog front-end circuits
- 150 mA output current with only 100 µA quiescent current maximizes battery runtime in always-on IoT and portable designs
- Tiny SOT-23-5 package with 2.2 V minimum input enables direct post-regulation from Li-ion or single-cell alkaline batteries
What is LP3990TL-1.2 used for?
LP3990TL-1.2 provides a clean 1.2 V regulated supply for noise-sensitive circuits including RF transceivers, PLLs, and precision ADC reference rails in portable wireless devices. Its ultra-low quiescent current of 100 µA and compact SOT-23-5 footprint make it a preferred choice for always-on subsystems in IoT sensor nodes and wearable electronics powered by small lithium batteries.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
What are equivalent replacements for LP3990TL-1.2?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range and quiescent current does LP3990TL-1.2 support for battery-powered designs?
LP3990TL-1.2 operates from an input voltage of 2.2 V to 5.5 V with a quiescent current of only 100 µA. This low ground current ensures minimal battery drain in always-on sensor nodes where the regulator powers circuits even during sleep modes.
How does LP3990TL-1.2 reduce noise in RF and analog circuits requiring a 1.2 V rail?
LP3990TL-1.2 delivers a fixed 1.2 V output with ultra-low output noise of approximately 30 µVRMS over a 10 Hz to 100 kHz bandwidth. This low-noise characteristic prevents voltage regulator noise from degrading the SNR of adjacent RF PLLs, VCOs, or 12-bit ADCs sharing the same 1.2 V supply rail.
What package does LP3990TL-1.2 use and how does it fit in compact PCB layouts?
LP3990TL-1.2 is housed in a SOT-23-5 package with a footprint of approximately 2.9 mm × 1.6 mm and 5 pins, supporting 150 mA output current in minimal board area. This compact size is compatible with fine-pitch PCB designs in wearables and miniaturized sensor modules requiring less than 5 mm² of regulator footprint.
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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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