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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 500MA DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.7V @ 200mA (Typ)
- Current - Output：500mA
- Current - Quiescent (Iq)：1 mA
- Current - Supply (Max)：12 mA
- PSRR：82dB ~ 60dB (120Hz ~ 10kHz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
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Overview
The LF18CDT-TR is a fixed-output linear low-dropout (LDO) voltage regulator manufactured by STMicroelectronics. It provides a stable 1.8 V output with a maximum continuous current of 500 mA. The device operates within an input voltage range of -0.5 V to 40 V, though the absolute maximum rating is listed as 16 V in detailed specifications. Key electrical parameters include a typical dropout voltage of 0.7 V at 200 mA and a quiescent current of 1 mA. Power supply rejection ratio (PSRR) ranges from 82 dB at 120 Hz to 60 dB at 10 kHz. The component is housed in a DPAK (TO-252-3) surface-mount package and supports an operating temperature range from -40°C to +125°C.
Feature Summary
- Very low dropout voltage design suitable for efficient power conversion near battery limits
- Low quiescent current consumption optimized for extended battery life in portable systems
- Integrated overcurrent and thermal shutdown protection mechanisms for enhanced reliability
Applications
- Battery-powered consumer electronics requiring low-noise power regulation
- Portable devices utilizing DC-to-DC conversion with strict power efficiency constraints
- Low-power embedded systems needing stable fixed-voltage rails
Procurement Notes
Verify the specific datasheet version when ordering, as packaging and internal box changes may occur via Product Change Notification (PCN). Confirm that the DPAK package variant matches your PCB footprint requirements. Ensure input voltage conditions do not exceed the absolute maximum ratings specified in the official STMicroelectronics documentation to prevent device failure.
Selection Notes
Select this component when a fixed 1.8 V rail is required with moderate current demands up to 500 mA. The DPAK package offers a balance between thermal performance and board space. Consider the 1 mA quiescent current if battery longevity is critical. Verify that the input voltage remains within the safe operating area defined in the datasheet to maintain regulation and protect the internal circuitry.
Part Context
This part belongs to the LFxx series of very low-drop regulators from STMicroelectronics. The series is characterized by its ability to operate with minimal voltage difference between input and output. The LF18CDT-TR specifically denotes the 1.8 V output variant in tape-and-reel packaging, designed for automated surface-mount assembly processes in high-volume manufacturing environments.
Replacement Considerations
Check for other members of the LFxx family with different output voltages or current ratings if system requirements change. Verify pin compatibility before substituting with other LDO packages like SOT-223 or TO-263.
