Overview
The LD1117DT28TR is a low drop 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 fixed version of the LD1117DT28TR offers an output voltage of 2.85 V, while the adjustable version can be set using a reference voltage (VREF = 1.25 V). The regulator is packaged in DPAK, which optimizes thermal characteristics and offers a space-saving design. It 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.
Key Specifications
| Parameter | Test Condition | Min. | Max. | Unit | |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 4.5 V, IO = 10 mA, TJ = 25 °C | 2.475 | 2.5 | 2.525 | V |
| Output Voltage (VO) | IO = 0 to 800 mA, Vin = 3.9 to 10 V | 2.45 | 2.55 | - | 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) | - | - | 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 |
| Dropout Voltage (Vd) | IO = 500 mA | 1.05 | 1.15 | - | V |
| Dropout Voltage (Vd) | IO = 800 mA | 1.10 | 1.2 | - | V |
Key Features
- Low Dropout Voltage: Typical dropout voltage of 1 V.
- High Output Current: Up to 800 mA of output current.
- Fixed and Adjustable Output Voltages: Fixed output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, and an adjustable version with VREF = 1.25 V.
- Internal Current and Thermal Limit: Built-in current and thermal protection.
- Tight Output Voltage Tolerance: Available in ± 1 % at 25 °C and 2 % in full temperature range.
- High Supply Voltage Rejection: 75 dB (typ.) supply voltage rejection.
- Efficient NPN Pass Transistor: Ensures high efficiency by allowing quiescent current to flow mostly into the load.
- Compact Packaging: Available in SOT-223, DPAK, SO-8, and TO-220 packages, optimizing thermal characteristics and space.
Applications
- Communications Equipment: Suitable for use in various communication devices due to its stable and efficient voltage regulation.
- Computers and Peripherals: Ideal for powering components in computers and peripheral devices.
- Industrial Applications: Used in industrial settings where reliable voltage regulation is critical.
- Personal Electronics: Suitable for portable and personal electronic devices requiring efficient power management.
Q & A
- What is the maximum output current of the LD1117DT28TR?
The LD1117DT28TR can provide up to 800 mA of output current.
- What are the available output voltages for the fixed versions of the LD1117?
The fixed versions offer output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- What is the typical dropout voltage of the LD1117DT28TR?
The typical dropout voltage is 1 V.
- What is the supply voltage rejection of the LD1117DT28TR?
The supply voltage rejection is 75 dB (typ.).
- What types of packaging are available for the LD1117DT28TR?
The device is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the quiescent current of the LD1117DT28TR?
The quiescent current is typically 10 mA.
- Does the LD1117DT28TR have built-in protection features?
Yes, it has internal current and thermal limit protection.
- What is the operating temperature range of the LD1117DT28TR?
The operating temperature range is -40°C to 125°C.
- Is the LD1117DT28TR RoHS compliant?
Yes, the LD1117DT28TR is lead-free and RoHS compliant.
- What is the minimum capacitor required for stability?
A minimum 10 µF capacitor is required for stability.
