Overview
The LD1117AV18 is a low drop positive voltage regulator produced by STMicroelectronics. This regulator is capable of providing up to 1 A of output current and is available in both fixed and adjustable versions. The LD1117AV18 specifically offers a fixed output voltage of 1.8 V. It is designed to optimize thermal characteristics and space efficiency, making it suitable for various applications requiring stable and efficient voltage regulation.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 1.8 V | 1.764 V | 1.836 V | V |
| Output Current (IO) | 1 A | 800 mA | 1.2 A | A |
| Dropout Voltage (VD) | 1.15 V | 1 V | 1.3 V | V |
| Quiescent Current (Id) | 5 mA | 5 mA | 10 mA | mA |
| Supply Voltage Rejection (SVR) | 75 dB | 60 dB | 80 dB | dB |
| Operating Input Voltage (Vin) | 10 V | 10 V | 15 V | V |
| Temperature Range | 0 °C to 125 °C | 0 °C | 125 °C | °C |
| Package Types | SOT-223, DPAK, TO-220 |
Key Features
- Low dropout voltage (1 V typical)
- Output current up to 1 A
- Fixed output voltage of 1.8 V (for LD1117AV18)
- Adjustable version available (VREF = 1.25 V)
- Internal current and thermal limit
- High supply voltage rejection (75 dB typical)
- Only a 10 µF minimum capacitor needed for stability
- Available in ± 2% (at 25 °C) and 4% in full temperature range
- High efficiency assured by NPN pass transistor
Applications
The LD1117AV18 is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- Portable applications requiring efficient voltage regulation
Q & A
- What is the maximum output current of the LD1117AV18?
The LD1117AV18 can provide up to 1 A of output current.
- What are the available package types for the LD1117AV18?
The device is available in SOT-223, DPAK, and TO-220 packages.
- What is the typical dropout voltage of the LD1117AV18?
The typical dropout voltage is 1.15 V at 1 A output current.
- What is the quiescent current of the LD1117AV18?
The quiescent current is typically 5 mA.
- What is the supply voltage rejection of the LD1117AV18?
The supply voltage rejection is typically 75 dB.
- What is the operating temperature range of the LD1117AV18?
The operating temperature range is from 0 °C to 125 °C.
- Is the LD1117AV18 available in adjustable versions?
- What capacitor value is recommended for stability?
A minimum of 10 µF capacitor is needed for stability.
- What are some common applications for the LD1117AV18?
Common applications include communications equipment, computers and peripherals, industrial applications, and personal electronics.
- How does the LD1117AV18 ensure high efficiency?
High efficiency is assured by the use of an NPN pass transistor, which allows the quiescent current to flow mostly into the load.
