Overview
The LD1117D18 is a low drop voltage regulator produced by STMicroelectronics. It is capable of providing up to 800 mA of output current and is available in both fixed and adjustable versions. The LD1117D18 specifically offers a fixed output voltage of 1.8 V. This regulator is designed to optimize thermal characteristics and is available in various packages including SOT-223, DPAK, SO-8, and TO-220. The use of an NPN pass transistor ensures high efficiency, with the quiescent current flowing mostly into the load. Stability is achieved with a minimum 10 µF capacitor.
Key Specifications
| Symbol | Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| VO | Output Voltage | Vin = 3.8 V, IO = 10 mA, TJ = 25 °C | 1.78 | 1.8 | 1.82 | V |
| VO | Output Voltage | IO = 0 to 800 mA, Vin = 3.3 to 8 V | 1.76 | 1.84 | V | |
| ΔVO | Line Regulation | Vin = 3.3 to 8 V, IO = 0 mA | 1 | 6 | mV | |
| ΔVO | 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 typ.)
- Output current up to 800 mA
- Fixed output voltage of 1.8 V (for LD1117D18), with other fixed versions available at 1.2 V, 2.5 V, 3.3 V, and 5.0 V
- Adjustable version availability (VREF = 1.25 V)
- Internal current and thermal limit
- Available in ± 1 % (at 25 °C) and 2 % in full temperature range
- Supply voltage rejection: 75 dB (typ.)
- High efficiency due to NPN pass transistor
- Minimum 10 µF capacitor required for stability
- On-chip trimming for tight output voltage tolerance
Applications
The LD1117D18 is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial equipment
- Personal electronics
- Portable applications requiring low dropout voltage and high current output
Q & A
- What is the maximum output current of the LD1117D18?
The LD1117D18 can provide up to 800 mA of output current.
- What are the available fixed 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.
- What is the typical dropout voltage of the LD1117D18?
The typical dropout voltage is 1 V.
- What packages are available for the LD1117D18?
The LD1117D18 is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the quiescent current of the LD1117D18?
The quiescent current is typically 5 to 10 mA when Vin ≤ 8 V.
- What is the supply voltage rejection of the LD1117D18?
The supply voltage rejection is typically 75 dB.
- What is the output noise voltage of the LD1117D18?
The output noise voltage is typically 100 µV from 10 Hz to 10 kHz.
- Is the LD1117D18 available in an adjustable version?
- What is the operating input voltage range for the LD1117D18?
- What is the thermal regulation of the LD1117D18?
