Overview
The L4962EH/A, produced by STMicroelectronics, is a monolithic power switching regulator designed for step-down configurations. This device delivers an output current of 1.5A with an output voltage range of 5.1V to 40V. It features a precise on-chip reference voltage of 5.1V with an accuracy of ±2%. The regulator operates at high switching frequencies up to 150KHz, ensuring high efficiency and minimal external component requirements. Key features include current limiting, soft start, thermal protection, and a wide duty cycle range for continuous operation.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Input Voltage Range | 9 | - | 46 | V |
| Output Voltage Range | 5.1 | - | 40 | V |
| Output Current | - | - | 1.5 | A |
| Switching Frequency | 85 | 100 | 115 | KHz |
| Line Regulation | - | - | 15 | mV |
| Load Regulation | - | - | 20 | mV |
| Internal Reference Voltage | 5 | 5.1 | 5.2 | V |
| Thermal Shutdown Junction Temperature | - | - | 150 | °C |
| Efficiency | - | - | 90 | % |
Key Features
- Precise On-Chip Reference: ±2% accuracy at 5.1V.
- High Switching Frequency: Up to 150KHz, reducing the size and cost of external filter components.
- High Efficiency: Up to 90% efficiency.
- Current Limiting: Internal current limiting to prevent overcurrent conditions.
- Soft Start: Prevents output overcurrents at switch-on and controls the output voltage rise.
- Thermal Protection: Thermal shutdown at junction temperature of about 150°C.
- Minimal External Components: Requires very few external components for operation.
Applications
- DC-DC Converters: Suitable for various DC-DC converter applications, including step-down configurations.
- Power Supplies: Can be used in programmable power supplies and multiple supply configurations.
- Preregulators: Useful as preregulators for distributed power supplies.
- Synchronized Supplies: Multiple L4962 devices can be synchronized for complex power supply systems.
Q & A
- What is the output current capability of the L4962EH/A?
The L4962EH/A can deliver up to 1.5A of output current.
- What is the output voltage range of the L4962EH/A?
The output voltage range is from 5.1V to 40V.
- What is the switching frequency range of the L4962EH/A?
The switching frequency range is from 85KHz to 115KHz.
- Does the L4962EH/A have thermal protection?
- What is the efficiency of the L4962EH/A?
The efficiency can be up to 90%.
- How does the soft start feature work in the L4962EH/A?
The soft start feature prevents output overcurrents at switch-on by controlling the output voltage rise through an external capacitor.
- What is the internal reference voltage of the L4962EH/A?
The internal reference voltage is 5.1V with an accuracy of ±2%.
- Can multiple L4962 devices be synchronized?
- What is the input voltage range for the L4962EH/A?
The input voltage range is from 9V to 46V.
- How does the current limiting feature work in the L4962EH/A?
The current limiting feature senses the load current and disables the output stage when the current exceeds a preset threshold.
