Overview
The LD1117AS25TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117 series, which offers both fixed and adjustable output voltage options. The LD1117AS25TR specifically provides a fixed output voltage of 2.5 V. This regulator is capable of delivering up to 800 mA of output current and is available in the SOT-223 package, which optimizes thermal characteristics and offers a space-saving design.
The device features high efficiency due to its NPN pass transistor, ensuring that the quiescent current flows mostly into the load. It requires a minimum 10 µF capacitor for stability and boasts tight output voltage tolerance, within ± 1% at 25 °C and ± 2% over the full temperature range.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 4.5 V, IO = 10 mA, TJ = 25 °C | 2.475 | 2.5 | 2.525 | V |
| Output Voltage (VO) | IO = 0 to 800 mA, Vin = 3.9 to 10 V | 2.45 | 2.55 | 2.55 | V |
| Line Regulation (∆VO) | Vin = 3.9 to 10 V, IO = 0 mA | 1 | 6 | mV | |
| Load Regulation (∆VO) | Vin = 3.9 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| Operating Input Voltage (Vin) | IO = 100 mA | 15 | V | ||
| Quiescent Current (Id) | Vin ≤ 10 V | 5 | 10 | mA | |
| Output Current (IO) | Vin = 7.5 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| Dropout Voltage (Vd) | IO = 100 mA | 1 | 1.1 | V | |
| Supply Voltage Rejection (SVR) | IO = 40 mA, f = 120 Hz, TJ = 25 °C | 60 | 75 | dB |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage of 2.5 V
- Adjustable version availability (VREF = 1.25 V), though the LD1117AS25TR is fixed
- Internal current and thermal limit
- Available in ± 1% (at 25 °C) and ± 2% in full temperature range
- High supply voltage rejection: 75 dB (typ.)
- Only a 10 µF minimum capacitor needed for stability
- On-chip trimming for tight output voltage tolerance
Applications
The LD1117AS25TR is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- Portable applications where low dropout voltage and high current capability are required
Q & A
- What is the maximum output current of the LD1117AS25TR?
The LD1117AS25TR can provide up to 800 mA of output current.
- What is the fixed output voltage of the LD1117AS25TR?
The fixed output voltage of the LD1117AS25TR is 2.5 V.
- What is the typical dropout voltage of the LD1117AS25TR?
The typical dropout voltage is 1 V.
- What is the quiescent current of the LD1117AS25TR?
The quiescent current is typically 5 mA and can be up to 10 mA.
- What is the operating input voltage range for the LD1117AS25TR?
The operating input voltage range is up to 15 V.
- What is the supply voltage rejection of the LD1117AS25TR?
The supply voltage rejection is typically 75 dB.
- What type of packages is the LD1117AS25TR available in?
The LD1117AS25TR is available in the SOT-223 package.
- What is the temperature range for the LD1117AS25TR?
The operating temperature range is from 0 °C to 125 °C.
- Is the LD1117AS25TR pin-to-pin compatible with other standard adjustable voltage regulators?
Yes, the adjustable version of the LD1117 is pin-to-pin compatible with other standard adjustable voltage regulators, though the LD1117AS25TR is a fixed version.
- What is the minimum capacitor required for stability?
A minimum 10 µF capacitor is required for stability.
