Overview
The LD1117V, produced by STMicroelectronics, is a low dropout voltage regulator designed to provide up to 800 mA of output current. It is available in both fixed and adjustable output voltage versions. The fixed versions offer output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, while the adjustable version allows for a reference voltage of 1.25 V. This regulator is known for its high efficiency, low dropout voltage, and robust thermal and current limiting features, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (Fixed Versions) | 1.2, 1.8, 2.5, 3.3, 5.0 | - | - | V |
| Output Voltage (Adjustable Version) | 1.225 | 1.25 | 1.275 | V |
| Output Current | 800 | 950 | 1300 | mA |
| Operating Input Voltage | - | - | 15 | V |
| Quiescent Current | 5 | 10 | - | mA |
| Dropout Voltage | 1 | 1.1 | 1.2 | V |
| Supply Voltage Rejection | 60 | 75 | - | dB |
| Output Noise Voltage | - | 100 | - | µV |
| Thermal Regulation | 0.01 | 0.1 | - | %/W |
Key Features
- Low dropout voltage (typically 1 V)
- High output current capability up to 800 mA
- Fixed output voltages: 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V; adjustable version with VREF = 1.25 V
- Internal current and thermal limiting
- Tight output voltage tolerance: ±1% at 25°C and ±2% over the full temperature range
- High supply voltage rejection (typically 75 dB)
- Low quiescent current (typically 5 mA)
- Available in SOT-223, DPAK, SO-8, and TO-220 packages
Applications
The LD1117V is versatile and can be used in a variety of applications, including:
- Power supplies for electronic devices requiring low dropout voltages
- Battery-powered systems where efficiency and low quiescent current are crucial
- Post-regulated dual supply systems
- Battery-backed-up regulated supplies
- General-purpose voltage regulation in industrial, automotive, and consumer electronics
Q & A
- What is the maximum output current of the LD1117V?
The LD1117V can provide up to 800 mA of output current. - What are the available fixed output voltages for the LD1117V?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V. - What is the reference voltage for the adjustable version of the LD1117V?
The reference voltage for the adjustable version is 1.25 V. - What is the typical dropout voltage of the LD1117V?
The typical dropout voltage is 1 V. - What is the supply voltage rejection of the LD1117V?
The supply voltage rejection is typically 75 dB. - What are the package options for the LD1117V?
The LD1117V is available in SOT-223, DPAK, SO-8, and TO-220 packages. - What is the quiescent current of the LD1117V?
The quiescent current is typically 5 mA. - What is the operating input voltage range for the LD1117V?
The operating input voltage range is up to 15 V. - Does the LD1117V have internal current and thermal limiting?
Yes, the LD1117V has internal current and thermal limiting features. - What is the output noise voltage of the LD1117V?
The output noise voltage is typically 100 µV.
