Overview
The LD1117S28TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117 series, which offers both fixed and adjustable output voltage options. The LD1117S28TR specifically provides a fixed output voltage of 2.8 V, although the series includes other fixed voltages such as 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, as well as an adjustable version with a reference voltage (VREF) of 1.25 V. This regulator is capable of delivering up to 800 mA of output current and features a low dropout voltage of 1 V typical. The device is available in several packages, including SOT-223, DPAK, SO-8, and TO-220, which optimize thermal characteristics and offer space-saving benefits.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 4.5 V, IO = 10 mA, TJ = 25 °C | 2.75 | 2.8 | 2.85 | V |
| Output Voltage (VO) | IO = 0 to 800 mA, Vin = 3.9 to 10 V | 2.7 | 2.9 | V | |
| Line Regulation (∆VO) | Vin = 3.9 to 10 V, IO = 0 mA | 1 | 6 | mV | |
| Load Regulation (∆VO) | Vin = 3.9 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| Temperature Stability (∆VO) | TJ = 0 to 125 °C | 0.5 | % | ||
| Long Term Stability (∆VO) | 1000 hrs, TJ = 125 °C | 0.3 | % | ||
| Operating Input Voltage (Vin) | IO = 100 mA | - | - | 15 | V |
| Quiescent Current (Id) | Vin ≤ 10 V | 5 | 10 | mA | |
| Output Current (IO) | Vin = 7.5 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 10 kHz, TJ = 25 °C | - | 100 | - | µV |
| Supply Voltage Rejection (SVR) | IO = 40 mA, f = 120 Hz, TJ = 25 °C | 60 | 75 | - | dB |
| Dropout Voltage (Vd) | IO = 100 mA | 1 | 1.1 | V |
Key Features
- Low Dropout Voltage: 1 V typical, ensuring efficient voltage regulation even at low input voltages.
- High Output Current: Up to 800 mA, making it suitable for a variety of applications requiring stable power supply.
- 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 with VREF = 1.25 V.
- Internal Current and Thermal Limit: Built-in 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, ensuring minimal noise and ripple in the output voltage.
- Compact Packages: Available in SOT-223, DPAK, SO-8, and TO-220 packages, optimizing thermal performance and space efficiency.
Applications
- Communications Equipment: Suitable for use in telecommunications devices and networks.
- Computers and Peripherals: Ideal for power supply in computer systems, printers, and other peripherals.
- Industrial Applications: Used in various industrial control systems and automation equipment.
- Personal Electronics: Applicable in portable electronics, such as handheld devices and battery-powered gadgets.
Q & A
- What is the typical dropout voltage of the LD1117S28TR?
The typical dropout voltage is 1 V.
- What is the maximum output current of the LD1117S28TR?
The maximum output current is up to 800 mA.
- What are the available fixed output voltages for the LD1117 series?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- Is the LD1117S28TR available in an adjustable version?
No, the LD1117S28TR is a fixed voltage regulator, but the LD1117 series does offer an adjustable version with VREF = 1.25 V.
- What is the operating temperature range of the LD1117S28TR?
The operating temperature range is from 0 to 125 °C.
- What is the quiescent current of the LD1117S28TR?
The quiescent current is typically 5 to 10 mA.
- What is the supply voltage rejection of the LD1117S28TR?
The supply voltage rejection is typically 75 dB.
- What packages are available for the LD1117S28TR?
The device 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.
- Does the LD1117S28TR have built-in protection features?
