Overview
The LD1117S25TR, produced by STMicroelectronics, is a low dropout voltage regulator designed to provide a stable output voltage with high efficiency. This component is available in both fixed and adjustable output voltage versions. The LD1117S25TR specifically offers a fixed output voltage of 2.5V and is capable of delivering up to 800 mA of output current. It is packaged in the SOT-223 format, which optimizes thermal characteristics and offers a space-saving design.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 2.45 | 2.5 | 2.55 | V |
| Operating Input Voltage (Vin) | - | - | 15 | V |
| Output Current (IO) | - | 800 | 1300 | mA |
| Dropout Voltage (Vd) | 1 | 1.1 | 1.2 | V |
| Line Regulation (∆VO) | 1 | 6 | 30 | mV |
| Load Regulation (∆VO) | 1 | 10 | 30 | mV |
| Temperature Stability (∆VO) | - | 0.5 | - | % |
| Quiescent Current (Id) | 5 | 10 | - | mA |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
| Thermal Resistance Junction-Case (RthJC) | - | 15 | - | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | - | 110 | - | °C/W |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage of 2.5 V (for LD1117S25TR)
- Adjustable version available (VREF = 1.25 V) for other models
- Internal current and thermal limit
- High accuracy with ± 1 % (at 25 °C) and ± 2 % in full temperature range
- Supply voltage rejection: 75 dB (typ.)
- Low quiescent current
- High efficiency due to NPN pass transistor
- Minimum 10 µF capacitor required for stability
Applications
The LD1117S25TR is suitable for a variety of applications requiring stable and efficient voltage regulation. These include:
- Power supplies for electronic devices
- Battery-powered equipment
- Automotive systems
- Industrial control systems
- Consumer electronics
Q & A
- What is the maximum output current of the LD1117S25TR?
The LD1117S25TR can deliver up to 800 mA of output current. - What is the typical dropout voltage of the LD1117S25TR?
The typical dropout voltage is 1.1 V. - What are the available output voltages for the LD1117 series?
The LD1117 series offers fixed output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, as well as an adjustable version. - What is the operating input voltage range for the LD1117S25TR?
The operating input voltage range is up to 15 V. - What is the thermal resistance junction-case for the SOT-223 package?
The thermal resistance junction-case (RthJC) for the SOT-223 package is 15 °C/W. - What is the supply voltage rejection (SVR) of the LD1117S25TR?
The supply voltage rejection (SVR) is typically 75 dB. - What type of transistor is used in the LD1117S25TR?
The LD1117S25TR uses an NPN pass transistor. - What is the minimum capacitor required for stability?
A minimum 10 µF capacitor is required for stability. - What are the typical applications of the LD1117S25TR?
The LD1117S25TR is used in power supplies, battery-powered equipment, automotive systems, industrial control systems, and consumer electronics. - What is the quiescent current of the LD1117S25TR?
The quiescent current is typically 10 mA.
