Overview
The LD1117DT30 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 fixed version of the LD1117DT30 offers an output voltage of 3.0 V. This regulator is known for its high efficiency, achieved through the use of an NPN pass transistor, which ensures that the quiescent current flows mostly into the load. The device is available in several package types, including SOT-223, DPAK, SO-8, and TO-220, with the SOT-223 and DPAK packages optimizing thermal characteristics and offering space-saving benefits. 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 Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| VO (Output Voltage) | Vin = 4.5 V, IO = 10 mA, TJ = 25 °C | 2.94 | 3.0 | 3.06 | V |
| VO (Output Voltage) | IO = 0 to 800 mA, Vin = 3.9 to 10 V | 2.88 | 3.12 | V | |
| ΔVO (Line Regulation) | Vin = 3.9 to 12 V, IO = 0 mA | 1 | 30 | mV | |
| ΔVO (Load Regulation) | Vin = 4.5 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| Vin (Operating Input Voltage) | IO = 100 mA | 15 | V | ||
| Id (Quiescent Current) | Vin ≤ 10 V | 5 | 10 | mA | |
| IO (Output Current) | Vin = 7.5 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, Vin = 5.5 V, Vripple = 1 VPP | 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 (3.0 V for LD1117DT30)
- 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 LD1117DT30 is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- SCSI-2 active termination (for the 2.85 V version)
Q & A
- What is the maximum output current of the LD1117DT30?
The LD1117DT30 can provide up to 800 mA of output current.
- What are the available package types for the LD1117DT30?
The device is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the typical dropout voltage of the LD1117DT30?
The typical dropout voltage is 1 V.
- What is the operating input voltage range for the LD1117DT30?
The operating input voltage range is up to 15 V.
- What is the quiescent current of the LD1117DT30?
The quiescent current is typically 5-10 mA.
- What is the supply voltage rejection of the LD1117DT30?
The supply voltage rejection is typically 75 dB.
- What is the output noise voltage of the LD1117DT30?
The output noise voltage is typically 100 µV.
- What is the temperature stability of the LD1117DT30?
The temperature stability is 0.5%.
- What is the long-term stability of the LD1117DT30?
The long-term stability is 0.3% over 1000 hours at 125 °C.
- Is the LD1117DT30 pin-to-pin compatible with other standard adjustable voltage regulators?
Yes, the adjustable LD1117 is pin-to-pin compatible with other standard adjustable voltage regulators.
