Overview
The MC33269D, produced by onsemi, is a low dropout, medium current, positive voltage regulator designed for use in low input voltage applications. This device offers an economical solution for precision voltage regulation while minimizing power losses. It is available in fixed and adjustable output versions, making it versatile for various circuit designs. The regulator features a 1.0 V dropout composite PNP-NPN pass transistor, current limiting, and thermal shutdown, ensuring reliable operation under different conditions.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (Iout = 10 mA, TA = 25°C) | VO | 3.27 (3.3 V suffix) | 3.33 (3.3 V suffix) | 3.35 (3.3 V suffix) | V |
| Dropout Voltage (Iout = 500 mA) | Vin - Vout | - | 1.0 | 1.1 | V |
| Output Current | Iout | - | - | 800 | mA |
| Ripple Rejection (10 Vpp, 120 Hz Sinewave; Iout = 500 mA) | RR | - | - | 55 | dB |
| Quiescent Current (Fixed Output) | IQ | - | - | 5.5 (1.5 V ≤ Vout ≤ 3.5 V) | mA |
| Minimum Required Load Current (Fixed Output) | ILoad | - | - | 0 | mA |
| Adjustment Pin Current | IAdj | - | - | 120 | µA |
| Operating Ambient Temperature Range | TA | -40 | - | 125 | °C |
| Storage Temperature | Tstg | -55 | - | 150 | °C |
Key Features
- Low dropout voltage of 1.0 V, suitable for low input voltage applications.
- Output current in excess of 800 mA.
- Thermal protection and short circuit protection for enhanced reliability.
- Output voltage trimmed to 1.0% tolerance.
- Available in fixed output versions (3.3 V, 3.5 V, 5.0 V, 12 V) and adjustable output versions.
- Space-saving DPAK, SO-8, and SOT-223 power packages.
- NCV prefix versions are AEC-Q100 qualified and PPAP capable, suitable for automotive and other applications requiring unique site and control change requirements.
Applications
The MC33269D is suitable for a variety of applications where precise voltage regulation is required, including:
- Low input voltage systems where power efficiency is crucial.
- Automotive systems, especially those requiring AEC-Q100 qualification.
- Battery-backed power supplies and current regulators.
- Digitally controlled voltage regulators.
- General-purpose power supply circuits requiring medium current and low dropout voltage.
Q & A
- What is the maximum output current of the MC33269D?
The maximum output current of the MC33269D is in excess of 800 mA.
- What are the available output voltage versions for the MC33269D?
The MC33269D is available in fixed output versions (3.3 V, 3.5 V, 5.0 V, 12 V) and adjustable output versions.
- What is the dropout voltage of the MC33269D?
The dropout voltage of the MC33269D is 1.0 V.
- Does the MC33269D have thermal protection?
Yes, the MC33269D includes thermal protection and short circuit protection.
- What are the recommended capacitor specifications for stability?
An external output capacitor of at least 10 µF with an ESR of less than 10 Ω but greater than 0.2 Ω is recommended for stability.
- Is the MC33269D suitable for automotive applications?
Yes, the NCV prefix versions of the MC33269D are AEC-Q100 qualified and PPAP capable, making them suitable for automotive and other applications requiring unique site and control change requirements.
- What is the operating ambient temperature range of the MC33269D?
The operating ambient temperature range of the MC33269D is -40°C to +125°C.
- What are the recommended power packages for the MC33269D?
The MC33269D is available in space-saving DPAK, SO-8, and SOT-223 power packages.
- Does the MC33269D require an input bypass capacitor?
An input bypass capacitor is recommended to improve transient response, especially if the regulator is connected to the supply input filter with long wire lengths.
- How does the adjustable output version of the MC33269D work?
The adjustable output version uses resistors R1 and R2 to set the output voltage, with the adjust pin current causing negligible drop across resistor R2.
