Overview
The LD1117AS12TR is a low dropout voltage regulator produced by STMicroelectronics. It is capable of providing up to 1 A of output current and is available in fixed and adjustable versions. The fixed version of the LD1117AS12TR offers an output voltage of 1.2 V. This regulator is designed for high-efficiency applications, particularly in automotive and industrial environments, due to its robust thermal and electrical characteristics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 1.2 V | V |
| Output Current | Up to 1 A | A |
| Dropout Voltage | 1.15 V (typ. @ IOUT = 1 A, 25 °C) | V |
| Quiescent Current | 5 mA (typ. @ 25 °C) | mA |
| Supply Voltage Rejection | 80 dB (typ. @ 25 °C) | dB |
| Operating Junction Temperature | 0 to 125 °C | °C |
| Thermal Resistance Junction-Ambient | 110 °C/W (SOT-223) | °C/W |
| Package Type | SOT-223, DPAK, TO-220 |
Key Features
- Low Dropout Voltage: 1.15 V typical at 1 A output current and 25 °C.
- High Output Current: Up to 1 A.
- Fixed Output Voltages: Available in 1.2 V, 1.8 V, and 3.3 V fixed versions, with an adjustable version available.
- Low Quiescent Current: 5 mA typical at 25 °C.
- High Supply Voltage Rejection: 80 dB typical at 25 °C.
- Internal Current and Thermal Limit: Built-in protection against overcurrent and overheating.
- Stability with Minimal Capacitance: Only 10 µF capacitor required for stability.
- Tight Output Voltage Tolerance: ±2% at 25 °C and ±4% over the full temperature range.
Applications
- Automotive Systems: Suitable for use in automotive applications due to its robust thermal and electrical characteristics.
- Industrial Control Systems: Used in various industrial control systems requiring stable and efficient voltage regulation.
- Power Supplies: Ideal for use in power supply units where high efficiency and low dropout voltage are critical.
- Embedded Systems: Can be used in embedded systems that require reliable and stable voltage regulation.
Q & A
- What is the maximum output current of the LD1117AS12TR?
The LD1117AS12TR can provide up to 1 A of output current.
- What are the available output voltages for the LD1117A series?
The LD1117A series is available in fixed output voltages of 1.2 V, 1.8 V, and 3.3 V, as well as an adjustable version.
- What is the typical dropout voltage of the LD1117AS12TR at 1 A output current?
The typical dropout voltage is 1.15 V at 1 A output current and 25 °C.
- What is the quiescent current of the LD1117AS12TR?
The quiescent current is 5 mA typical at 25 °C.
- What is the supply voltage rejection of the LD1117AS12TR?
The supply voltage rejection is 80 dB typical at 25 °C.
- What are the package types available for the LD1117AS12TR?
The LD1117AS12TR is available in SOT-223, DPAK, and TO-220 packages.
- What is the operating junction temperature range of the LD1117AS12TR?
The operating junction temperature range is 0 to 125 °C.
- What is the thermal resistance junction-ambient for the SOT-223 package?
The thermal resistance junction-ambient for the SOT-223 package is 110 °C/W.
- How much capacitance is required for stability?
Only 10 µF capacitor is required for stability.
- What is the output voltage tolerance of the LD1117AS12TR?
The output voltage tolerance is ±2% at 25 °C and ±4% over the full temperature range.
