Overview
The LD1117DT33CTR is a low dropout voltage regulator produced by STMicroelectronics. This device is capable of providing up to 800 mA of output current and is available in both fixed and adjustable versions. The LD1117DT33CTR specifically offers a fixed output voltage of 3.3 V. It is designed to optimize thermal characteristics and is available in several package types, including DPAK, which is used for this particular model. The regulator features high efficiency due to its NPN pass transistor, ensuring that the quiescent current flows mostly into the load. Only a minimum 10 μF capacitor is required for stability, and on-chip trimming allows for a tight output voltage tolerance of ± 1% at 25 °C.
Key Specifications
| Parameter | Value |
|---|---|
| Output Voltage | 3.3 V |
| Output Current | Up to 800 mA |
| Dropout Voltage | 1 V (typ.) |
| Package Type | DPAK |
| Operating Temperature Range | -40 °C to 125 °C |
| Output Voltage Tolerance | ± 1% at 25 °C, ± 2% in full temperature range |
| Supply Voltage Rejection | 75 dB (typ.) |
| Minimum Capacitor for Stability | 10 μF |
Key Features
- Low dropout voltage (1 V typ.)
- High output current capability up to 800 mA
- Fixed output voltage of 3.3 V
- Available in DPAK package for optimized thermal characteristics and space saving
- High efficiency due to NPN pass transistor
- Tight output voltage tolerance within ± 1% at 25 °C and ± 2% in full temperature range
- Internal current and thermal limit for protection
- Supply voltage rejection of 75 dB (typ.)
Applications
The LD1117DT33CTR is suitable for a variety of applications requiring a stable and efficient voltage regulation. These include:
- Power supplies for electronic devices
- Active termination in SCSI-2 systems
- Point-of-load regulation in complex systems
- General purpose voltage regulation in industrial and consumer electronics
Q & A
- What is the output voltage of the LD1117DT33CTR?
The output voltage of the LD1117DT33CTR is 3.3 V. - What is the maximum output current of the LD1117DT33CTR?
The maximum output current is up to 800 mA. - What is the typical dropout voltage of the LD1117DT33CTR?
The typical dropout voltage is 1 V. - In what package type is the LD1117DT33CTR available?
The LD1117DT33CTR is available in the DPAK package. - What is the operating temperature range of the LD1117DT33CTR?
The operating temperature range is from -40 °C to 125 °C. - What is the output voltage tolerance of the LD1117DT33CTR?
The output voltage tolerance is ± 1% at 25 °C and ± 2% in the full temperature range. - What is the minimum capacitor required for stability?
A minimum 10 μF capacitor is required for stability. - What is the supply voltage rejection of the LD1117DT33CTR?
The supply voltage rejection is 75 dB (typ.). - Does the LD1117DT33CTR have internal protection features?
Yes, it has internal current and thermal limits for protection. - What are some common applications of the LD1117DT33CTR?
Common applications include power supplies, SCSI-2 active termination, point-of-load regulation, and general purpose voltage regulation in various electronics.
