Overview
The LD1117ADT-TR is a high-accuracy, low-dropout voltage regulator produced by STMicroelectronics. This component is designed for use in automotive and industrial applications, offering reliable voltage regulation with high efficiency. The LD1117A series, which includes the LD1117ADT-TR, is available in various packages such as SOT-223, DPAK, and TO-220, each optimized for thermal characteristics and space-saving advantages.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | VI = 5.3 V, IO = 10 mA, TJ = 25 °C | 1.176 | 1.2 | 1.224 | V |
| Dropout Voltage (VD) | IO = 1 A | 1.15 | 1.15 | 1.30 | V |
| Quiescent Current (Id) | VI ≤ 8 V, IO = 0 mA | 5 | 5 | 10 | mA |
| Output Current (IO) | VI - VO = 5 V, TJ = 25 °C | 1000 | 1000 | 1200 | mA |
| Operating Input Voltage (VI) | IO = 100 mA | 10 | V | ||
| Temperature Range | 0 | 125 | °C | ||
| Supply Voltage Rejection (SVR) | IO = 40 mA, f = 120 Hz, VI - VO = 3 V, Vripple = 1 VPP | 60 | 75 | dB |
Key Features
- Low Dropout Voltage: Typically 1.15 V at 1 A output current and 25 °C.
- High Accuracy: Output voltage tolerance within ± 2% at 25 °C and ± 4% over the full temperature range.
- High Efficiency: Achieved through the use of an NPN pass transistor.
- Low Quiescent Current: Typically 5 mA at 25 °C.
- Internal Current and Thermal Limit: Built-in protection against overcurrent and overheating.
- Stability with Minimal Capacitance: Only a 10 µF capacitor is required for stability.
- Adjustable Version Availability: Adjustable output voltage with a reference voltage of 1.25 V.
- High Supply Voltage Rejection: Typically 75 dB at 120 Hz.
Applications
- Automotive Systems: Suitable for use in automotive applications due to its robust thermal and electrical characteristics.
- Industrial Equipment: Ideal for industrial environments requiring reliable and efficient voltage regulation.
- Power Supplies: Can be used in various power supply designs where low dropout and high accuracy are necessary.
- Embedded Systems: Suitable for use in embedded systems that require stable and efficient voltage regulation.
Q & A
- What is the typical dropout voltage of the LD1117ADT-TR 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 LD1117ADT-TR?
The quiescent current is typically 5 mA at 25 °C.
- What is the maximum output current of the LD1117ADT-TR?
The maximum output current is 1 A.
- What is the operating temperature range of the LD1117ADT-TR?
The operating temperature range is from 0 °C to 125 °C.
- What is the supply voltage rejection of the LD1117ADT-TR?
The supply voltage rejection is typically 75 dB at 120 Hz.
- Is the LD1117ADT-TR available in adjustable versions?
- What type of packages is the LD1117ADT-TR available in?
The LD1117ADT-TR is available in SOT-223 and other packages such as DPAK and TO-220.
- What is the minimum capacitance required for stability?
Only a 10 µF capacitor is required for stability.
- Does the LD1117ADT-TR have built-in protection features?
- In what types of applications is the LD1117ADT-TR commonly used?
