Overview
The LD1117D33 is a low drop voltage regulator produced by STMicroelectronics. This regulator 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 LD1117D33 offers an output voltage of 3.3 V. The device is supplied in various packages including SOT-223, DPAK, SO-8, and TO-220, with the SOT-223 and DPAK packages optimizing thermal characteristics and offering space-saving benefits. High efficiency is achieved through the use of an 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 within ± 1% at 25 °C.
Key Specifications
| Symbol | Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| VO | Output Voltage | Vin = 5.3 V, IO = 10 mA, TJ = 25 °C | 3.267 | 3.3 | 3.333 | V |
| VO | Output Voltage | IO = 0 to 800 mA, Vin = 4.75 to 10 V | 3.235 | 3.365 | V | |
| ΔVO | Line Regulation | Vin = 4.75 to 15 V, IO = 0 mA | 1 | 6 | mV | |
| ΔVO | Load Regulation | Vin = 4.75 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| ΔVO | Temperature Stability | 0.5 | % | |||
| Vin | Operating Input Voltage | IO = 100 mA | 15 | V | ||
| Id | Quiescent Current | Vin ≤ 15 V | 5 | 10 | mA | |
| IO | Output Current | Vin = 10 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: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 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
- Tight output voltage tolerance within ± 1 % at 25 °C
Applications
The LD1117D33 is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial equipment
- Personal electronics
Q & A
- What is the maximum output current of the LD1117D33?
The LD1117D33 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 LD1117D33?
The typical dropout voltage is 1 V. - What is the supply voltage rejection of the LD1117D33?
The supply voltage rejection is typically 75 dB. - What packages are available for the LD1117D33?
The device is available in SOT-223, DPAK, SO-8, and TO-220 packages. - What is the quiescent current of the LD1117D33?
The quiescent current is between 5 mA and 10 mA when Vin ≤ 15 V. - What is the output noise voltage of the LD1117D33?
The output noise voltage is typically 100 µV over a bandwidth of 10 Hz to 10 kHz. - Is the LD1117D33 available in an adjustable version?
Yes, the LD1117 is available in an adjustable version with a reference voltage (VREF) of 1.25 V. - What is the operating input voltage range for the LD1117D33?
The operating input voltage range is up to 15 V. - What is the temperature stability of the LD1117D33?
The temperature stability is 0.5%.
