Overview
The L4931CZ33-AP, produced by STMicroelectronics, is a very low dropout voltage regulator designed for low noise and low power applications, particularly in battery-powered systems. This regulator is available in various packages including SO-8, DPAK, and TO-92. It features a very low dropout voltage of 0.4 V and a low quiescent current, making it highly efficient. The device also includes a TTL compatible shutdown logic control function, which allows for part of the board to be put in standby mode, reducing total power consumption.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 3.234 | 3.3 | 3.366 | V |
| Operating Input Voltage (VI) | - | - | 20 | V |
| Output Current Limit (Iout) | - | - | 300 | mA |
| Line Regulation (∆VO) | 3 | - | 18 | mV |
| Load Regulation (∆VO) | 3 | - | 18 | mV |
| Quiescent Current (Id) - ON Mode | 0.6 | 1 | - | mA |
| Quiescent Current (Id) - OFF Mode | 50 | - | 100 | µA |
| Supply Voltage Rejection (SVR) | 70 | - | - | dB |
| Output Noise Voltage (eN) | - | - | 50 | µV |
| Dropout Voltage (Vd) | 0.4 | - | 0.6 | V |
| Control Input Logic Low (VIL) | 0.8 | - | - | V |
| Control Input Logic High (VIH) | - | - | 2 | V |
| Control Input Current (II) | - | - | 10 | µA |
| Output Bypass Capacitance (CO) | 2 | - | 10 | µF |
| Operating Junction Temperature Range (TOP) | -40 | - | 125 | °C |
Key Features
- Very Low Dropout Voltage: 0.4 V, making it suitable for low noise and low power applications.
- Low Quiescent Current: Typically 600 µA in ON mode and 50 µA in OFF mode.
- Output Current: Up to 250 mA.
- Logic Controlled Electronic Shutdown: TTL compatible shutdown logic control function available in PPAK and SO-8 packages.
- Internal Current and Thermal Limit: Built-in protection against overcurrent and overheating.
- Low Output Noise Voltage: 50 µV from 10 Hz to 100 kHz.
- High Supply Voltage Rejection: Up to 70 dB at 1 kHz.
- Compact Packages: Available in SO-8, DPAK, and TO-92 packages.
- Wide Temperature Range: Operating junction temperature range from -40 to 125 °C.
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption and high efficiency.
- Low Noise Applications: Suitable for applications requiring minimal noise, such as audio equipment and medical devices.
- Portable Electronics: Used in handheld devices, smartphones, and other portable electronics.
- Industrial Control Systems: Can be used in various industrial control systems where low dropout voltage and low quiescent current are essential.
- Automotive Systems: Applicable in automotive electronics where reliability and efficiency are critical.
Q & A
- What is the typical dropout voltage of the L4931CZ33-AP?
The typical dropout voltage is 0.4 V.
- What is the maximum output current of the L4931CZ33-AP?
The maximum output current is up to 250 mA.
- What are the available output voltages for the L4931 series?
The available output voltages include 3.3 V, 3.5 V, 5 V, and 12 V.
- What is the quiescent current in ON mode for the L4931CZ33-AP?
The quiescent current in ON mode is typically 600 µA.
- Does the L4931CZ33-AP have built-in protection features?
- What is the operating junction temperature range for the L4931CZ33-AP?
The operating junction temperature range is from -40 to 125 °C.
- What packages are available for the L4931 series?
The L4931 series is available in SO-8, DPAK, and TO-92 packages.
- How much output bypass capacitance is required for stability?
Only a 2.2 µF capacitor is required for stability.
- Is the L4931CZ33-AP suitable for battery-powered systems?
- What is the supply voltage rejection of the L4931CZ33-AP?
The supply voltage rejection is typically 70 dB at 1 kHz.
