Overview
The LD1117DT25CTR is a low dropout voltage regulator produced by STMicroelectronics. This component is part of the LD1117 series, which offers both fixed and adjustable output voltage options. The LD1117DT25CTR specifically provides a fixed output voltage of 2.5V and can supply up to 800 mA of output current. It is available in several package types, including DPAK, SOT-223, SO-8, and TO-220, with the DPAK package being particularly noted for its surface mount design and optimized thermal characteristics.
This regulator is known for its high efficiency, achieved through the use of an NPN pass transistor, which ensures that the quiescent current flows mostly into the load. The device also features internal current and thermal limits, ensuring reliable operation over a wide range of conditions.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 2.45 | 2.5 | 2.55 | V |
| Output Current (IO) | - | 800 | 950 | mA |
| Line Regulation (∆VO) | 1 | - | 10 | 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 | - | 1.2 | V |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
| Operating Temperature | -40 | - | 125 | °C |
Key Features
- Low Dropout Voltage: Typically 1 V, ensuring efficient voltage regulation even at low input voltages.
- High Output Current: Up to 800 mA, making it suitable for a variety of applications requiring stable power supply.
- Fixed Output Voltage: Available in several fixed output voltages including 2.5V, with an adjustable version also available.
- Internal Current and Thermal Limits: Provides protection against overcurrent and overtemperature conditions.
- High Efficiency: Achieved through the use of an NPN pass transistor, which minimizes quiescent current.
- Supply Voltage Rejection: High PSRR of 75 dB (typ.) at 120 Hz, ensuring minimal noise from the input supply.
- Compact Packaging: Available in SOT-223, DPAK, SO-8, and TO-220 packages, optimizing thermal performance and space efficiency.
- Lead-Free and RoHS Compliant: Ensures compliance with environmental regulations.
Applications
The LD1117DT25CTR is versatile and can be used in a variety of applications, including:
- Power Supply Systems: For providing stable and regulated voltage in power supply units.
- Embedded Systems: In microcontroller-based systems, IoT devices, and other embedded applications requiring low dropout voltage regulation.
- Automotive Electronics: Due to its wide operating temperature range (-40°C to 125°C), it is suitable for automotive applications.
- Industrial Control Systems: For reliable voltage regulation in industrial control and automation systems.
- Consumer Electronics: In devices such as audio equipment, medical devices, and other consumer electronics requiring stable power supply.
Q & A
- What is the output voltage of the LD1117DT25CTR?
The output voltage of the LD1117DT25CTR is fixed at 2.5V.
- What is the maximum output current of the LD1117DT25CTR?
The maximum output current of the LD1117DT25CTR is up to 800 mA.
- What are the available package types for the LD1117DT25CTR?
The LD1117DT25CTR is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the typical dropout voltage of the LD1117DT25CTR?
The typical dropout voltage of the LD1117DT25CTR is 1 V.
- Does the LD1117DT25CTR have internal protection features?
Yes, the LD1117DT25CTR has internal current and thermal limits for protection.
- What is the operating temperature range of the LD1117DT25CTR?
The operating temperature range of the LD1117DT25CTR is -40°C to 125°C.
- Is the LD1117DT25CTR lead-free and RoHS compliant?
Yes, the LD1117DT25CTR is lead-free and RoHS compliant.
- What is the supply voltage rejection ratio (PSRR) of the LD1117DT25CTR?
The PSRR of the LD1117DT25CTR is typically 75 dB at 120 Hz.
- What type of transistor is used in the LD1117DT25CTR for high efficiency?
The LD1117DT25CTR uses an NPN pass transistor for high efficiency.
- What is the minimum capacitor required for stability in the LD1117DT25CTR?
A minimum capacitor of 10 µF is required for stability.
