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Product Detailed Parameters
- Description：IC REG LINEAR 5V 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)：5V
- 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 LD1117-5.0 is a positive low dropout voltage regulator providing a fixed 5.0V output with a maximum current of 1A. It operates within an input voltage range up to 12V and maintains stability across a junction temperature range of -40°C to +125°C. The device features a typical dropout voltage of 1.2V at full load, ensuring high efficiency. Electrical specifications include a line regulation of 9mV typ and load regulation of 10mV typ. Power supply rejection ratio reaches 75dB at 120Hz. Output voltage tolerance is maintained within ±1.5% for the 5.0V fixed version.
Feature Summary
- Integrated thermal shutdown protection prevents damage from excessive junction temperatures during overload conditions.
- Built-in current limiting safeguards the device against short circuits and overcurrent scenarios.
- NPN pass transistor design ensures high efficiency by directing quiescent current primarily into the load.
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, SOT-89-3L, or TO-252-2L) required for your PCB layout, as the LD1117 series is available in multiple surface mount configurations. Confirm that the selected component matches the fixed 5.0V output designation. Ensure compatibility with standard linear regulator bypassing requirements using tantalum capacitors for optimal stability.
Selection Notes
Select this component when a stable 5V rail is needed from higher input voltages with moderate current demands up to 1A. The low dropout characteristic makes it suitable for battery-powered applications where input voltage may approach the output level. Consider thermal resistance values for the chosen package to ensure adequate heat dissipation under maximum load conditions.
Part Context
The LD1117 series comprises adjustable and fixed positive voltage regulators designed for general-purpose power management. Manufactured by UMW (YouTai Semiconductor), these devices utilize on-chip trimming for tight output voltage tolerances. The family includes various fixed output options alongside an adjustable version, catering to diverse electronic product requirements.
Replacement Considerations
LD1117D33 (STMicroelectronics)
FAQ
What capacitor value is recommended for device stability?
A 22μF tantalum capacitor is recommended for output bypassing to ensure stability across all operating conditions.
How does the NPN pass transistor affect efficiency?
Unlike PNP transistors, the NPN pass transistor allows quiescent current to flow mostly into the load, thereby assuring high efficiency.
