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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 500MA DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- 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 positive linear low-dropout (LDO) voltage regulator from the STMicroelectronics LF series, housed in a TO-252-3 (DPAK) surface-mount package. It provides a fixed output voltage of 1.8 V with a maximum continuous output current of 0.5 A. The device features a typical dropout voltage of 0.45 V and a maximum of 700 mV at full load. Quiescent current is specified at 1 mA. Electrical performance includes a line regulation of 12 mV and load regulation of 10 mV, with an output voltage accuracy of 2%. The input voltage range extends from -0.5 V to 40 V. Operating junction temperature ranges from -40 °C to +125 °C.
Feature Summary
- Very low dropout voltage capability for efficient power conversion near battery limits
- Integrated on-off switch functionality for system power management
- Low quiescent current design optimized for battery-powered applications
- Robust thermal performance via DPAK package with exposed tab
Applications
- Battery-powered portable electronic systems
- Low-noise analog circuit power supplies
- Low-power embedded subsystems requiring stable 1.8 V rails
Procurement Notes
Verify the specific suffix 'TR' indicates tape-and-reel packaging when ordering. Confirm the exact part number LF18CDT-TR matches the required 1.8 V fixed output and 0.5 A current rating. Ensure the TO-252-3 package footprint aligns with the PCB layout. Check RoHS compliance status if restricted substances are mandated for the application environment.
Selection Notes
Select this component when a fixed 1.8 V output is required with minimal voltage headroom. The low dropout characteristic suits single-cell lithium battery applications where input voltage may sag close to the output level. The integrated switch feature allows direct control of power states without external logic. Verify that the 0.5 A current capacity meets the peak load requirements of the downstream circuitry.
Part Context
This device belongs to the LFXX family of very low drop regulators from STMicroelectronics. The family offers various fixed output voltages tailored for low-power and low-noise applications. The LF18 variant specifically targets 1.8 V digital logic and analog sensor supply needs within portable consumer electronics and industrial instrumentation.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-reference with other LDO families only after verifying pin compatibility and electrical parameter equivalence.
