Overview
The LD1117DTC-R, produced by STMicroelectronics, is a low drop voltage regulator capable of providing up to 800 mA of output current. This device is available in both fixed and adjustable 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 uses a reference voltage (VREF) of 1.25 V. The LD1117 is packaged in SOT-223, DPAK, SO-8, and TO-220 formats, with the SOT-223 and DPAK packages optimizing thermal characteristics and offering space-saving benefits. The regulator features high efficiency due to its NPN pass transistor, which ensures that the quiescent current flows mostly into the load. Only a minimum 10 µF capacitor is required for stability, and on-chip trimming allows for a tight output voltage tolerance of ±1% at 25°C.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 3.8 V, IO = 10 mA, TJ = 25°C | 1.78 | 1.8 | 1.82 | V |
| Output Current (IO) | Vin = 6.8 V, TJ = 25°C | 800 | 950 | 1300 | mA |
| Dropout Voltage (Vd) | IO = 100 mA | 1 | 1.1 | 1.1 | V |
| Quiescent Current (Id) | Vin ≤ 8 V | 5 | 10 | 10 | mA |
| Supply Voltage Rejection (SVR) | IO = 40 mA, f = 120 Hz, TJ = 25°C | 60 | 75 | 75 | dB |
| Operating Input Voltage (Vin) | IO = 100 mA | - | - | 15 | V |
| Output Noise Voltage (eN) | B = 10 Hz to 10 kHz, TJ = 25°C | - | 100 | - | µV |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage options: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
- Adjustable version available (VREF = 1.25 V)
- Internal current and thermal limit
- Output voltage tolerance: ±1% at 25°C and ±2% over full temperature range
- Supply voltage rejection: 75 dB (typ.)
- Available in SOT-223, DPAK, SO-8, and TO-220 packages
- High efficiency due to NPN pass transistor
Applications
The LD1117 is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- Portable applications requiring low dropout voltage and high current capability
Q & A
- What is the maximum output current of the LD1117?
The LD1117 can provide up to 800 mA of output current.
- What are the available fixed output voltages for the LD1117?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- What is the reference voltage for the adjustable version of the LD1117?
The reference voltage (VREF) for the adjustable version is 1.25 V.
- What is the typical dropout voltage of the LD1117?
The typical dropout voltage is 1 V.
- What is the supply voltage rejection of the LD1117?
The supply voltage rejection is typically 75 dB.
- What packages are available for the LD1117?
The LD1117 is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the quiescent current of the LD1117?
The quiescent current is typically 10 mA when Vin ≤ 8 V.
- What is the output noise voltage of the LD1117?
The output noise voltage is typically 100 µV over a bandwidth of 10 Hz to 10 kHz.
- What is the operating input voltage range for the LD1117?
The operating input voltage range is up to 15 V.
- What are the thermal characteristics of the LD1117 packages?
The SOT-223 and DPAK packages optimize thermal characteristics and offer space-saving benefits.
