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Product Detailed Parameters
- Description：IC REG LIN POS ADJ 800MA TO263
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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 LM1117SX-ADJ is an adjustable low-dropout linear regulator manufactured by Texas Instruments. It provides a maximum output current of 800 mA with a dropout voltage of 1.2 V at full load. The output voltage is adjustable from 1.25 V to 13.8 V using two external resistors. The device features line regulation of 0.2% and load regulation of 0.4%. It operates within a junction temperature range of 0°C to 125°C for the standard LM1117 variant. The component includes built-in current limiting and thermal shutdown protection.
Feature Summary
- Adjustable output voltage capability ranging from 1.25 V to 13.8 V via external resistors
- Integrated current limiting and thermal shutdown protection mechanisms
- Low dropout performance ensuring efficient regulation under varying loads
Applications
- Post regulator for switching DC-DC converters
- Battery charger circuits
- Portable instrumentation power supplies
- Active SCSI termination regulators
Procurement Notes
Verify that the specific ordering suffix matches the required package type, as the LM1117 family utilizes various packages including SOT-223, TO-220, and TO-252. Confirm the temperature grade corresponds to system requirements, distinguishing between commercial (LM1117) and industrial (LM1117I) variants. Ensure the datasheet version aligns with the manufacturing lot for accurate electrical characteristic references.
Selection Notes
Select this component when a high-current linear regulator with low dropout is required for space-constrained designs. The adjustable version allows flexibility in setting precise output voltages without fixed internal resistor networks. Consider the thermal resistance characteristics of the chosen package to ensure adequate heat dissipation. Verify that the input voltage remains within the 15 V maximum rating during all operating conditions.
Part Context
The LM1117 series is a widely used family of low-dropout linear regulators designed for applications requiring stable voltage regulation with minimal component count. The adjustable variant distinguishes itself by offering customizable output levels through external feedback components. This specific part represents the adjustable option within the broader LM1117 lineup, providing versatility for diverse voltage rail requirements in portable and industrial electronics.
Replacement Considerations
LM1117IMPX-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 by connecting two external resistors between the output, adjust, and ground pins to form a voltage divider network.
