Overview
The LD1117DTTR, produced by STMicroelectronics, is a low dropout voltage regulator capable of providing up to 800 mA of output current. It is available in both fixed and adjustable versions, with the adjustable version offering a reference voltage (VREF) of 1.25 V. This regulator is designed to offer high efficiency and stability, making it suitable for a wide range of applications.
The device is available in several package types, including SOT-223, DPAK, SO-8, and TO-220, which optimize thermal characteristics and offer space-saving benefits. The LD1117DTTR features internal current and thermal limiting, ensuring reliable operation under various conditions.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Current (IO) | 800 | 950 | 1300 | mA |
| Dropout Voltage (Vd) | 1 | 1.1 | 1.2 | V |
| Quiescent Current (Id) | 5 | 10 | mA | |
| Operating Input Voltage (Vin) | 15 | V | ||
| Output Voltage Tolerance | ±1% | ±2% | ||
| Line Regulation (∆VO) | 0.035% | 0.2% | ||
| Load Regulation (∆VO) | 0.1% | 0.4% | ||
| Supply Voltage Rejection (SVR) | 60 dB | 75 dB | ||
| Thermal Resistance Junction-Case (RthJC) | 5-20 | °C/W | ||
| Thermal Resistance Junction-Ambient (RthJA) | 50-110 | °C/W |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage options: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
- Adjustable version available (VREF = 1.25 V)
- Internal current and thermal limiting
- High supply voltage rejection (typ. 75 dB)
- Available in ±1% (at 25 °C) and ±2% in full temperature range output voltage tolerance
- Surface mount packages (SOT-223, DPAK) for improved thermal characteristics and space-saving
- Only a 10 µF minimum capacitor required for stability
Applications
The LD1117DTTR is versatile and can be used in a variety of applications, including:
- Power supplies for electronic devices requiring low dropout voltages
- Battery-powered devices where voltage regulation is crucial
- Industrial control systems needing stable voltage outputs
- Automotive electronics where thermal stability is important
- Consumer electronics such as audio equipment and gaming consoles
Q & A
- What is the maximum output current of the LD1117DTTR?
The LD1117DTTR can provide up to 800 mA of output current.
- What are the available fixed output voltage options for the LD1117DTTR?
The fixed output voltage options are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- Is the LD1117DTTR available in an adjustable version?
- What is the typical dropout voltage of the LD1117DTTR?
The typical dropout voltage is 1 V.
- What is the quiescent current of the LD1117DTTR?
The quiescent current is typically 10 mA.
- What is the operating input voltage range for the LD1117DTTR?
The operating input voltage range is up to 15 V.
- What is the thermal resistance junction-case (RthJC) for the LD1117DTTR in different packages?
The RthJC varies from 5 to 20 °C/W depending on the package type.
- What is the supply voltage rejection (SVR) of the LD1117DTTR?
The supply voltage rejection is typically 75 dB.
- What type of packages is the LD1117DTTR available in?
The LD1117DTTR is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the minimum capacitor required for stability?
A minimum capacitor of 10 µF is required for stability.
