Overview
The LE50CD, produced by STMicroelectronics, is a very low-dropout voltage regulator that is part of the LEXX series. This regulator is designed to provide stable output voltages with minimal dropout voltage and low quiescent current, making it ideal for low-noise, low-power applications and battery-powered systems. The LE50CD is available in SO-8 and TO-92 packages and offers a range of features that enhance its performance and versatility.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 10 mA, VI = 7 V | 4.95 | 5 | 5.05 | V |
| Operating Input Voltage (VI) | IO = 100 mA | - | - | 18 | V |
| Output Current Limit (IO) | - | 150 | - | 425 | mA |
| Line Regulation (∆VO) | VI = 5.7 to 18 V, IO = 0.5 mA | 4 | - | 20 | mV |
| Load Regulation (∆VO) | VI = 6 V, IO = 0.5 to 100 mA | 3 | - | 15 | mV |
| Quiescent Current (Id) | VI = 6 to 18 V, IO = 0 mA, ON mode | 0.5 | 1 | - | mA |
| Quiescent Current (Id) | VI = 6 V, OFF mode | 50 | - | 100 | µA |
| Dropout Voltage (Vd) | IO = 100 mA | 0.2 | - | 0.4 | V |
| Supply Voltage Rejection (SVR) | IO = 5 mA, VI = 7 ± 1 V, f = 120 Hz | - | 76 | - | dB |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz | - | 50 | - | µV |
| Operating Junction Temperature (TOP) | - | -40 | - | 125 | °C |
Key Features
- Very Low Dropout Voltage: The LE50CD features a very low dropout voltage of 0.2 V typical, making it suitable for applications where minimal voltage loss is critical.
- Low Quiescent Current: The regulator has a low quiescent current of 0.5 mA in ON mode and 50 µA in OFF mode, which is beneficial for power-saving designs.
- High Output Current: It can supply up to 100 mA of output current, with an internally limited current to prevent overheating.
- Internal Current and Thermal Limit: The device includes internal current and thermal limiting to ensure safe operation under various conditions.
- Small Capacitor Requirement: A small 2.2 µF capacitor is required for stability, reducing component size and cost.
- Shutdown Logic Control: In the SO-8 package, the device includes a shutdown logic control (TTL compatible) that allows part of the board to be put in standby mode, reducing total power consumption.
- High Supply Voltage Rejection: The regulator offers high supply voltage rejection, typically 76 dB at 120 Hz, ensuring stable output voltage despite input voltage variations.
- Wide Temperature Range: The device operates over a wide temperature range from -40 to 125 °C, making it suitable for various environmental conditions.
Applications
- Low-Power Systems: Ideal for battery-powered devices and other low-power applications where minimizing power consumption is crucial.
- Portable Electronics: Suitable for portable electronics such as handheld devices, smartphones, and tablets due to its low dropout voltage and quiescent current.
- Industrial Automation: Used in industrial automation systems where stable and efficient power regulation is necessary.
- Medical Devices: Applicable in medical devices that require reliable and low-noise power supply.
- Automotive Systems: Can be used in automotive systems where a wide operating temperature range and high reliability are required.
Q & A
- What is the typical dropout voltage of the LE50CD?
The typical dropout voltage of the LE50CD is 0.2 V.
- What is the maximum output current of the LE50CD?
The maximum output current of the LE50CD is internally limited to 425 mA.
- What is the quiescent current in ON mode for the LE50CD?
The quiescent current in ON mode for the LE50CD is typically 0.5 mA.
- What is the quiescent current in OFF mode for the LE50CD?
The quiescent current in OFF mode for the LE50CD is typically 50 µA.
- What is the operating junction temperature range for the LE50CD?
The operating junction temperature range for the LE50CD is from -40 to 125 °C.
- Does the LE50CD have internal current and thermal limiting?
- What type of packages is the LE50CD available in?
The LE50CD is available in SO-8 and TO-92 packages.
- What is the supply voltage rejection of the LE50CD at 120 Hz?
The supply voltage rejection of the LE50CD at 120 Hz is typically 76 dB.
- Is the LE50CD pin-to-pin compatible with other regulators?
- What is the recommended output bypass capacitance for the LE50CD?
The recommended output bypass capacitance for the LE50CD is 2.2 µF with an ESR of 0.1 to 10 Ω.
