Overview
The LD1117DTR, 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 output voltage versions, making it versatile for various applications. The LD1117DTR can supply up to 800 mA of output current and is known for its low dropout voltage, typically 1 V, and high supply voltage rejection of 75 dB.
The device is offered in several package types, including SOT-223, DPAK, SO-8, and TO-220, which optimize thermal characteristics and offer space-saving benefits. The regulator features internal current and thermal limits, ensuring reliable operation over a wide range of conditions.
Key Specifications
| Parameter | Test Condition | Min. | Max. | Unit | |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 4.5 V, IO = 10 mA, TJ = 25 °C | 2.475 | 2.5 | 2.525 | V |
| Output Current (IO) | Vin = 7.5 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| Quiescent Current (Id) | Vin ≤ 10 V | 5 | 10 | 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 | |
| Operating Input Voltage (Vin) | IO = 100 mA | 15 | V | ||
| Output Noise Voltage (eN) | B = 10 Hz to 10 kHz, TJ = 25 °C | 100 | µV | ||
| Temperature Stability | 0.5 | % |
Key Features
- Low Dropout Voltage: Typically 1 V, ensuring minimal voltage loss.
- High Output Current: Up to 800 mA, suitable for a wide range of applications.
- Fixed and Adjustable Output Voltages: Available in fixed voltages (1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V) and an adjustable version (VREF = 1.25 V).
- Internal Current and Thermal Limits: Ensures safe operation by preventing overheating and overcurrent conditions.
- High Supply Voltage Rejection: 75 dB (typ.) at 120 Hz, providing a stable output voltage despite input voltage variations.
- Compact Packages: Available in SOT-223, DPAK, SO-8, and TO-220 packages, optimizing thermal performance and space usage.
- Tight Output Voltage Tolerance: Within ± 1 % at 25 °C, ensuring precise voltage regulation.
Applications
- Power Supplies: Ideal for building efficient and stable power supply units.
- Embedded Systems: Suitable for use in microcontroller-based projects and other embedded systems requiring stable voltage regulation.
- Automotive Electronics: Can be used in automotive applications due to its robust thermal and current handling capabilities.
- Industrial Control Systems: Applicable in industrial environments where reliable voltage regulation is critical.
- Consumer Electronics: Used in various consumer electronic devices requiring stable and efficient power management.
Q & A
- What is the maximum output current of the LD1117DTR?
The LD1117DTR can provide up to 800 mA of output current.
- What are the available fixed output voltages for the LD1117DTR?
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 typical dropout voltage of the LD1117DTR?
The typical dropout voltage is 1 V.
- What is the supply voltage rejection (SVR) of the LD1117DTR?
The supply voltage rejection is typically 75 dB at 120 Hz.
- What are the package types available for the LD1117DTR?
The device is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the quiescent current of the LD1117DTR?
The quiescent current is typically 5 mA to 10 mA.
- What is the operating temperature range of the LD1117DTR?
The operating temperature range is from 0 °C to 125 °C.
- Is the LD1117DTR suitable for high-temperature applications?
Yes, it is suitable for high-temperature applications with a maximum junction temperature of 125 °C.
- What is the minimum capacitor required for stability?
A minimum capacitor of 10 µF is required for stability.
- Does the LD1117DTR have internal current and thermal limits?
Yes, it has internal current and thermal limits to ensure safe operation.
