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Product Detailed Parameters
- Description：IC REG LIN POS ADJ 800MA TO263
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：13.8V
- Voltage Dropout (Max)：1.2V @ 800mA
- Current - Output：800mA
- Current - Quiescent (Iq)：5 mA
- Current - Supply (Max)：10 mA
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Supplier Device Package：TO-263 (DDPAK-3)
- Grade：-
- Qualification：-
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Overview
The LM1117S-ADJ is an adjustable low-dropout linear regulator from Texas Instruments, delivering up to 800 mA of output current. It provides a stable output voltage range from 1.25 V to 13.8 V using only two external resistors. The device features a dropout voltage of 1.2 V at full load and includes built-in current limiting and thermal shutdown protection. Designed for the commercial temperature range of 0°C to 125°C, it utilizes a Zener-trimmed bandgap reference to ensure output accuracy within ±1%.
Feature Summary
- Adjustable output voltage configuration utilizing external resistors.
- Integrated current limiting and thermal shutdown mechanisms.
- Zener-trimmed bandgap reference for high voltage accuracy.
Applications
- Post regulator for switching DC-DC converters
- High efficiency linear regulators
- Battery chargers
- Portable instrumentation power supplies
Procurement Notes
Verify that the specific part number suffix corresponds to the SOT-223 package variant. Confirm the 'S' designation aligns with the required commercial operating temperature range (0°C to 125°C) rather than the industrial grade (-40°C to 125°C). Ensure the ordering information matches the exact pinout and thermal characteristics defined in the official datasheet.
Selection Notes
Select this component when a fixed-output LDO is insufficient due to non-standard voltage requirements. The adjustable architecture allows precise voltage setting via external resistors. Designers must account for the minimum 10 µF tantalum output capacitor requirement to maintain stability and transient response performance under varying load conditions.
Part Context
This component belongs to the LM1117 family of 800 mA low-dropout linear regulators manufactured by Texas Instruments. The family encompasses both fixed-voltage options (1.8 V, 2.5 V, 3.3 V, 5 V) and adjustable variants. The LM1117S-ADJ specifically denotes the adjustable version housed in the SOT-223 surface-mount package.
Replacement Considerations
LM1117DT-ADJ/NOPB
FAQ
What is the minimum output capacitance required for stability?
A minimum of 10 µF tantalum capacitor is required at the output to improve transient response and ensure regulator stability.
How is the output voltage determined for the adjustable version?
The output voltage is set between 1.25 V and 13.8 V using a resistor divider network consisting of two external resistors connected to the adjust terminal.
