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Product Detailed Parameters
- Description：IC REG LINEAR 1.2V 1A SOT-223-3L
- Series：-
- Mfr：UMW
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：1.2V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：Current Limit
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223-3L
- Grade：-
- Qualification：-
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Overview
The UMW LD1117-1.2 is a positive low dropout linear voltage regulator providing a fixed 1.2V output with a maximum current of 1A. It operates within an input voltage range up to 15V and maintains a typical dropout voltage of 1.2V at full load. The device features high ripple rejection of 60dB at 120Hz, line regulation of 9mV typ, and load regulation of 10mV typ. Output accuracy is specified at less than 1.5% for the 1.2V version. It includes thermal shutdown and current limiting protections, operating from -40°C to +125°C.
Feature Summary
- Fixed 1.2V output with less than 1.5% tolerance
- Integrated thermal shutdown and current limiting protection
- Low dropout voltage performance at 1A load
- High power supply rejection ratio for noise reduction
Applications
- Laptop, Palmtop, and Notebook Computers
- Battery Charger Systems
- Cellular Phone Power Management
- Cordless Telephones
- SMPS Post-Regulator
Procurement Notes
Verify the specific package variant (SOT-223-3L, TO-252-2L, or SOT-89-3L) required for your design, as the LD1117 series is available in multiple form factors. Confirm that the 1.2V fixed output version meets your system's voltage requirements, as other fixed voltages are also part of this family. Ensure proper heat dissipation planning due to the internal thermal shutdown mechanism.
Selection Notes
Select the LD1117-1.2 when a stable 1.2V rail is needed from higher input voltages with moderate current demands up to 1A. Consider its thermal resistance characteristics relative to the chosen package for high ambient temperatures. This regulator is suitable for applications requiring simple implementation with minimal external components, provided the input-output differential does not exceed safe dissipation limits.
Part Context
The LD1117 series by UMW is a family of 1A LDO regulators offering both fixed and adjustable output options. The LD1117-1.2 specifically provides a fixed 1.2V output, distinguishing it from other variants like the 3.3V or 5.0V versions. It shares common features such as NPN pass transistor architecture and on-chip trimming for tight voltage tolerance across the entire product line.
Replacement Considerations
LD1117-1.2
FAQ
What is the typical dropout voltage for the LD1117-1.2 at 1A load?
The typical dropout voltage is 1.2V when the output current is 1A.
Does the LD1117-1.2 include overcurrent protection?
Yes, the device includes internal current limiting and thermal shutdown protection functions.
What is the output voltage accuracy for the 1.2V fixed version?
The output voltage tolerance for the 1.2V fixed version is less than 1.5%.
