Overview
The LD1117S12TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117 series, which is capable of providing up to 800 mA of output current. This specific model, LD1117S12TR, is a fixed voltage regulator with an output voltage of 1.2 V. The device is available in the SOT-223 package, which optimizes thermal characteristics and offers a space-saving design. The regulator features an NPN pass transistor, ensuring high efficiency by allowing the quiescent current to flow mostly into the load. Only a minimum 10 μF capacitor is required for stability, and on-chip trimming enables a tight output voltage tolerance of ± 1% at 25 °C.
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 Voltage (VO) | IO = 10 to 800 mA, Vin - VO = 1.4 to 10 V | 1.140 | 1.20 | 1.260 | V |
| Line Regulation (∆VO) | Vin - VO = 1.5 to 13.75 V, IO = 10 mA | 0.035 | 0.2 | % | |
| Load Regulation (∆VO) | Vin - VO = 3 V, IO = 10 to 800 mA | 0.1 | 0.4 | % | |
| Operating Input Voltage (Vin) | IO = 100 mA | - | - | 15 | V |
| Quiescent Current (Id) | Vin ≤ 8 V | 5 | 10 | mA | |
| Output Current (IO) | Vin = 6.8 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 typical.
- High Output Current: Up to 800 mA.
- Fixed Output Voltage: 1.2 V for the LD1117S12TR model.
- Adjustable Version Availability: With a reference voltage (VREF) of 1.25 V.
- Internal Current and Thermal Limit: For protection against overcurrent and overheating.
- Tight Output Voltage Tolerance: ± 1% at 25 °C and ± 2% over the full temperature range.
- High Supply Voltage Rejection: 75 dB typical.
- Efficient NPN Pass Transistor: Ensures high efficiency by directing quiescent current mostly into the load.
Applications
- Communications Equipment: Suitable for use in various communication devices due to its stable output and low dropout voltage.
- Computers and Peripherals: Ideal for power management in computer systems and peripherals.
- Industrial Applications: Used in industrial settings where reliable and efficient power regulation is crucial.
- Personal Electronics: Applicable in portable electronics and other personal devices requiring stable power supply).
- Electronic and Robotic Toys: Suitable for use in electronic toys and robotic devices).
Q & A
- What is the maximum output current of the LD1117S12TR?
The LD1117S12TR can provide up to 800 mA of output current).
- What is the output voltage of the LD1117S12TR?
The output voltage of the LD1117S12TR is fixed at 1.2 V).
- What is the typical dropout voltage of the LD1117S12TR?
The typical dropout voltage is 1 V).
- What is the supply voltage rejection of the LD1117S12TR?
The supply voltage rejection is 75 dB typical).
- What type of transistor is used in the LD1117S12TR?
The LD1117S12TR uses an NPN pass transistor).
- What is the minimum capacitor required for stability?
A minimum 10 μF capacitor is required for stability).
- What are the available packages for the LD1117 series?
The LD1117 series is available in SOT-223, DPAK, SO-8, and TO-220 packages).
- What is the operating input voltage range for the LD1117S12TR?
The operating input voltage range is up to 15 V).
- Does the LD1117S12TR have internal current and thermal limits?
Yes, the LD1117S12TR has internal current and thermal limits for protection).
- What is the output voltage tolerance of the LD1117S12TR at 25 °C?
The output voltage tolerance is ± 1% at 25 °C).
