Overview
The LD1117AV25 is a low drop voltage regulator produced by STMicroelectronics. It is capable of providing up to 1 A of output current and is available in both fixed and adjustable versions. The fixed version of the LD1117AV25 offers an output voltage of 5.0 V. This regulator is known for its high efficiency, low dropout voltage, and internal current and thermal limiting features. It is supplied in various packages including SOT-223, DPAK, and TO-220, which optimize thermal characteristics and offer space-saving advantages.
Key Specifications
| Parameter | Test Conditions | Min. | Max. | Unit | |
|---|---|---|---|---|---|
| Output Voltage (VO) | VIN = 7 V, IO = 10 mA, TJ = 25 °C | 4.95 | 5.0 | 5.05 | V |
| Output Voltage (VO) | IO = 0 to 1 A, VIN = 6.5 to 15 V | 4.9 | 5.1 | V | |
| Line Regulation (∆VO) | VIN = 6.5 to 15 V, IO = 0 mA | 1 | 10 | mV | |
| Load Regulation (∆VO) | VIN = 6.5 V, IO = 0 to 1 A | 1 | 15 | mV | |
| Operating Input Voltage (VIN) | IO = 100 mA | 15 | V | ||
| Quiescent Current (Id) | VIN ≤ 15 V, IO = 0 mA | 5 | 10 | mA | |
| Output Current (IO) | VIN - VO = 5 V, TJ = 25 °C | 1000 | 1200 | 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 | 1.10 | V |
Key Features
- Low dropout voltage: 1.15 V typical at 1 A output current and 25 °C
- Output current up to 1 A
- Fixed output voltage of 5.0 V (other fixed voltages available in different models: 1.2 V, 1.8 V, 2.5 V, 3.3 V)
- Adjustable version available with VREF = 1.25 V
- Internal current and thermal limiting
- High supply voltage rejection: 75 dB typical
- Only a 10 µF minimum capacitor required for stability
- Available in ± 2% (at 25 °C) and 4% in full temperature range
- Temperature range: 0 °C to 125 °C
- High efficiency assured by NPN pass transistor
Applications
- Power supply systems requiring low dropout voltage and high current output
- Active termination for SCSI-2 lines (especially the 2.85 V type)
- Embedded systems and microcontrollers requiring stable voltage regulation
- Industrial control systems and automation
- Consumer electronics and appliances needing efficient voltage regulation
Q & A
- What is the maximum output current of the LD1117AV25?
The LD1117AV25 can provide up to 1 A of output current.
- What are the available output voltages for the LD1117 series?
The LD1117 series offers fixed output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V. An adjustable version is also available.
- What is the typical dropout voltage of the LD1117AV25?
The typical dropout voltage is 1.15 V at 1 A output current and 25 °C.
- What is the quiescent current of the LD1117AV25?
The quiescent current is typically 5 mA at 25 °C.
- What is the supply voltage rejection of the LD1117AV25?
The supply voltage rejection is typically 75 dB.
- What is the temperature range for the LD1117AV25?
The operating temperature range is from 0 °C to 125 °C.
- What packages are available for the LD1117AV25?
The device is available in SOT-223, DPAK, and TO-220 packages.
- What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability.
- Does the LD1117AV25 have internal current and thermal limiting?
Yes, the LD1117AV25 has internal current and thermal limiting features.
- What is the long-term stability of the LD1117AV25?
The long-term stability is 0.3% over 1000 hours at 125 °C.
