Overview
The LD1117V18, produced by STMicroelectronics, is a low dropout voltage regulator designed to provide a stable output voltage with high efficiency. This regulator is available in both fixed and adjustable versions, with the LD1117V18 specifically offering a fixed output voltage of 1.8 V. It is capable of delivering up to 800 mA of output current, making it suitable for a wide range of applications requiring reliable voltage regulation.
The device features a low dropout voltage of 1 V typical, internal current and thermal limits, and high supply voltage rejection of 75 dB typical. It is available in several package types, including SOT-223, DPAK, SO-8, and TO-220, which optimize thermal characteristics and offer space-saving benefits.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 1.78 | 1.8 | 1.82 | V |
| Output Current (IO) | 0 | - | 800 | mA |
| Line Regulation (∆VO) | 1 | - | 6 | mV |
| Load Regulation (∆VO) | 1 | - | 10 | mV |
| Temperature Stability (∆VO) | - | 0.5 | - | % |
| Operating Input Voltage (Vin) | - | - | 15 | V |
| Quiescent Current (Id) | 5 | 10 | - | mA |
| Dropout Voltage (Vd) | 1 | 1.1 | 1.2 | V |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
Key Features
- Low dropout voltage of 1 V typical.
- Output current up to 800 mA.
- Fixed output voltage of 1.8 V.
- Internal current and thermal limits.
- High supply voltage rejection of 75 dB typical.
- Available in SOT-223, DPAK, SO-8, and TO-220 packages.
- Output voltage tolerance within ± 1 % at 25 °C.
- Only a 10 µF minimum capacitor required for stability.
Applications
- Power supplies for electronic devices requiring stable voltage regulation.
- Industrial control systems.
- Automotive electronics.
- Consumer electronics such as audio equipment and gaming consoles.
- Medical devices requiring precise voltage control.
Q & A
- What is the maximum output current of the LD1117V18?
The LD1117V18 can deliver up to 800 mA of output current.
- What is the typical dropout voltage of the LD1117V18?
The typical dropout voltage is 1 V.
- What are the available package types for the LD1117V18?
The LD1117V18 is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the output voltage tolerance of the LD1117V18 at 25 °C?
The output voltage tolerance is within ± 1 % at 25 °C.
- What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability.
- What is the operating input voltage range for the LD1117V18?
The operating input voltage range is up to 15 V.
- What is the quiescent current of the LD1117V18?
The quiescent current is typically 10 mA.
- What is the supply voltage rejection of the LD1117V18?
The supply voltage rejection is 75 dB typical.
- What are some common applications of the LD1117V18?
Common applications include power supplies, industrial control systems, automotive electronics, consumer electronics, and medical devices.
- What is the thermal resistance junction-case for the TO-220 package?
The thermal resistance junction-case for the TO-220 package is 5 °C/W.
