Overview
The LD1117V-DG, produced by STMicroelectronics, is a low drop voltage regulator capable of providing up to 800 mA of output current. It is available in both fixed and adjustable versions. The fixed versions offer output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, while the adjustable version uses a reference voltage (VREF) of 1.25 V. This regulator is designed to operate efficiently with a low dropout voltage of 1 V typical and features internal current and thermal limits for enhanced reliability.
Key Specifications
| Parameter | Test Condition | Min. | Max. | Unit | |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 3.2 V, IO = 10 mA, TJ = 25 °C | 1.188 | 1.20 | 1.212 | V |
| Output Current (IO) | Vin = 6.8 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| Dropout Voltage (Vd) | IO = 100 mA | 1 | 1.1 | 1.2 | V |
| Quiescent Current (Id) | Vin ≤ 8 V | 5 | 10 | - | mA |
| 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 |
Key Features
- Low dropout voltage (1 V typical)
- Output current up to 800 mA
- Fixed output voltages: 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 limits
- High efficiency due to NPN pass transistor
- Supply voltage rejection: 75 dB (typ.)
- Available in SOT-223, DPAK, SO-8, and TO-220 packages
- On-chip trimming for tight output voltage tolerance (± 1 % at 25 °C)
Applications
The LD1117V-DG is suitable for a variety of applications requiring stable and efficient voltage regulation. These include:
- Power supplies for electronic devices
- Active termination for SCSI-2 interfaces
- Embedded systems and microcontrollers
- Industrial control systems
- Automotive electronics
Q & A
- What is the maximum output current of the LD1117V-DG?
The LD1117V-DG can provide up to 800 mA of output current. - What are the available fixed output voltages for the LD1117V-DG?
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 reference voltage for the adjustable version of the LD1117V-DG?
The reference voltage (VREF) for the adjustable version is 1.25 V. - What is the typical dropout voltage of the LD1117V-DG?
The typical dropout voltage is 1 V. - What is the quiescent current of the LD1117V-DG?
The quiescent current is between 5 mA and 10 mA when Vin ≤ 8 V. - What is the supply voltage rejection of the LD1117V-DG?
The supply voltage rejection is typically 75 dB. - In what packages is the LD1117V-DG available?
The LD1117V-DG is available in SOT-223, DPAK, SO-8, and TO-220 packages. - What is the output voltage tolerance of the LD1117V-DG at 25 °C?
The output voltage tolerance is ± 1 % at 25 °C. - What is the operating input voltage range for the LD1117V-DG?
The operating input voltage range is up to 15 V. - What is the output noise voltage of the LD1117V-DG?
The output noise voltage is typically 100 µV from 10 Hz to 10 kHz.
