Overview
The LD1117AV, produced by STMicroelectronics, is a low drop voltage regulator designed to provide high efficiency and stability in various electronic applications. This regulator is capable of delivering up to 800 mA of output current and is available in both fixed and adjustable output voltage 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 can be set using a reference voltage (VREF) of 1.25 V.
The device is packaged in several formats, including SOT-223, DPAK, SO-8, and TO-220, which optimize thermal characteristics and offer space-saving advantages. The LD1117AV features an NPN pass transistor, ensuring high efficiency by directing the quiescent current primarily into the load.
Key Specifications
| Symbol | Parameter | Test Condition | Min. | Max. | Unit | |
|---|---|---|---|---|---|---|
| VO | Output Voltage | Vin = 3.8 V, IO = 10 mA, TJ = 25 °C | 1.78 | 1.8 | 1.82 | V |
| ∆VO | Line Regulation | Vin = 3.3 to 8 V, IO = 0 mA | 1 | 6 | mV | |
| ∆VO | Load Regulation | Vin = 3.3 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| Vin | Operating Input Voltage | IO = 100 mA | 15 | V | ||
| Id | Quiescent Current | Vin ≤ 8 V | 5 | 10 | mA | |
| IO | Output Current | Vin = 6.8 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| eN | Output Noise Voltage | B = 10 Hz to 10 kHz, TJ = 25 °C | 100 | µV | ||
| SVR | Supply Voltage Rejection | IO = 40 mA, f = 120 Hz, TJ = 25 °C | 60 | 75 | dB | |
| Vd | Dropout Voltage | IO = 100 mA | 1 | 1.1 | V |
Key Features
- Low dropout voltage: 1 V typical at 800 mA output current.
- Output current up to 800 mA.
- Fixed output voltages: 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- Adjustable version available with a reference voltage (VREF) of 1.25 V.
- Internal current and thermal limit for protection.
- High supply voltage rejection: 75 dB typical.
- Low quiescent current: 5 mA typical.
- Available in ± 1% (at 25 °C) and 2% in full temperature range for fixed versions.
- Only a 10 µF minimum capacitor required for stability.
- Surface mount packages (SOT-223, DPAK, SO-8) for optimized thermal characteristics and space-saving.
Applications
- Power supply systems requiring low dropout voltage and high current output.
- Embedded systems, industrial control systems, and consumer electronics.
- SCSI-2 active termination (2.85 V type).
- Automotive and aerospace applications due to its wide operating temperature range (0 °C to 125 °C).
- Any application requiring a stable and efficient voltage regulation with minimal external components.
Q & A
- What is the maximum output current of the LD1117AV?
The LD1117AV can provide up to 800 mA of output current.
- What are the available fixed output voltages for the LD1117AV?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- Is the LD1117AV available in an adjustable version?
Yes, the LD1117AV is available in an adjustable version with a reference voltage (VREF) of 1.25 V.
- What is the typical dropout voltage of the LD1117AV?
The typical dropout voltage is 1 V at 800 mA output current.
- What is the quiescent current of the LD1117AV?
The quiescent current is typically 5 mA.
- What is the supply voltage rejection of the LD1117AV?
The supply voltage rejection is typically 75 dB.
- What type of packages are available for the LD1117AV?
The device is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the operating temperature range of the LD1117AV?
The operating temperature range is from 0 °C to 125 °C.
- How much capacitance is required for stability?
A minimum of 10 µF capacitor is required for stability.
- Does the LD1117AV have internal protection features?
Yes, it has internal current and thermal limit protection.
