Overview
The MC33269ST-3.3T3 is a low dropout, medium current, positive voltage regulator produced by ON Semiconductor. This device is part of the MC33269 series, which is specifically designed for use in low input voltage applications. It offers an economical solution for precision voltage regulation while minimizing power losses. The regulator features a 1.0 V dropout composite PNP-NPN pass transistor, current limiting, and thermal shutdown, making it suitable for a variety of applications requiring stable voltage regulation.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage (Iout = 10 mA, TJ = 25°C) | VO | 3.27 | 3.3 | 3.33 | V |
| Output Voltage (Line, Load and Temperature) | VO | 3.23 | 3.3 | 3.37 | V |
| Reference Voltage (Iout = 10 mA, Vin - Vout = 2.0 V, TJ = 25°C) | Vref | 1.235 | 1.25 | 1.265 | V |
| Line Regulation | Regline | - | - | 0.3 | % |
| Load Regulation (Vin = Vout + 3.0 V, Iout = 10 mA to 800 mA, TJ = 25°C) | Regload | - | - | 0.5 | % |
| Dropout Voltage (Iout = 500 mA) | Vin - Vout | - | 1.0 | 1.25 | V |
| Dropout Voltage (Iout = 800 mA) | Vin - Vout | - | 1.1 | 1.35 | V |
| Ripple Rejection (10 Vpp, 120 Hz Sinewave; Iout = 500 mA) | RR | 55 | - | - | dB |
| Current Limit (Vin - Vout = 10 V) | ILimit | 800 | - | - | mA |
| Quiescent Current (Fixed Output) | IQ | - | - | 5.5 - 8.0 | mA |
| Minimum Required Load Current | ILoad | - | - | 0 - 8.0 | mA |
| Adjustment Pin Current | IAdj | - | - | 120 | µA |
| Operating Junction Temperature Range | TJ | -40 | - | 150 | °C |
| Storage Temperature | Tstg | -55 | - | 150 | °C |
Key Features
- Low dropout voltage of 1.0 V, ensuring efficient voltage regulation with minimal power loss.
- Output current capability in excess of 800 mA, making it suitable for medium current applications.
- Thermal protection and short circuit protection for enhanced reliability and safety.
- Output voltage trimmed to 1.0% tolerance for high precision.
- Available in fixed output voltages (3.3 V, 5.0 V, 12 V) and adjustable versions.
- Space-saving packages including DPAK, SO-8, and SOT-223.
- High ripple rejection of 55 dB at 120 Hz, ensuring stable output voltage.
- Low quiescent current, reducing standby power consumption.
Applications
The MC33269ST-3.3T3 is versatile and can be used in a variety of applications, including:
- Low input voltage systems where efficient voltage regulation is crucial.
- Power supplies for electronic devices requiring stable and regulated voltage.
- Industrial control systems where reliability and precision are essential.
- Automotive systems that require robust and efficient voltage regulation.
- Consumer electronics such as audio equipment, medical devices, and other applications needing stable DC voltage.
Q & A
- What is the maximum output current of the MC33269ST-3.3T3?
The maximum output current is in excess of 800 mA.
- What are the available output voltage options for the MC33269 series?
The MC33269 series is available in fixed output voltages of 3.3 V, 5.0 V, and 12 V, as well as adjustable versions.
- What is the dropout voltage of the MC33269ST-3.3T3?
The dropout voltage is typically less than 1.0 V, with a maximum of 1.25 V at 500 mA and 1.35 V at 800 mA.
- Does the MC33269ST-3.3T3 have built-in protection features?
- What is the recommended output capacitor 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.
- What are the operating temperature ranges for the MC33269ST-3.3T3?
The operating junction temperature range is -40°C to +150°C, and the storage temperature range is -55°C to +150°C.
- What packages are available for the MC33269 series?
The MC33269 series is available in DPAK, SO-8, and SOT-223 packages.
- How does the MC33269ST-3.3T3 handle ripple rejection?
- What is the quiescent current of the MC33269ST-3.3T3?
- Is an input bypass capacitor recommended?
