Overview
The L4978D is a step-down monolithic power switching regulator produced by STMicroelectronics. It delivers up to 2A of output current at voltages adjustable between 3.3V and 50V, selected by a simple external divider. The device is realized in BCD mixed technology and features an internal power D-MOS transistor, which ensures high efficiency and high switching speed. The L4978D operates with an input voltage range of 8V to 55V and supports a switching frequency up to 300kHz. It is available in both DIP-8 and SO16W packages, making it suitable for various assembly needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Output Current | 2 | A |
| Maximum Output Voltage | 50 | V |
| Minimum Output Voltage | 3.3 | V |
| Minimum Input Voltage | 8 | V |
| Maximum Input Voltage | 55 | V |
| Switching Frequency | Up to 300kHz | |
| Output Type | Adjustable | |
| Mounting Type | Surface Mount | |
| Package Type | DIP-8, SO16W | |
| Efficiency | Up to 87% | |
| Operating Temperature Range | -40°C to +150°C |
Key Features
- Pulse-by-pulse current limiting and hiccup mode for short circuit protection
- Voltage feedforward regulation
- Soft-start function
- Protection against feedback loop disconnection
- Inhibit for zero current consumption
- Thermal shutdown
- Zero load current operation
- Precise 3.3V (±1%) internal reference voltage
- Adjustable output voltage from 3.3V to 50V
Applications
The L4978D is suitable for a wide range of applications, including industrial and automotive systems, due to its high input-voltage capability and adjustable output voltage. It is particularly useful in scenarios requiring high efficiency, high switching speed, and robust protection features.
Q & A
- What is the maximum output current of the L4978D?
The maximum output current of the L4978D is 2A.
- What is the input voltage range for the L4978D?
The input voltage range for the L4978D is from 8V to 55V.
- What are the available package types for the L4978D?
The L4978D is available in DIP-8 and SO16W packages.
- What is the maximum switching frequency of the L4978D?
The maximum switching frequency of the L4978D is up to 300kHz.
- Does the L4978D have built-in protection features?
Yes, the L4978D includes protection features such as pulse-by-pulse current limiting, hiccup mode for short circuit protection, thermal shutdown, and protection against feedback loop disconnection.
- How is the output voltage adjusted on the L4978D?
The output voltage of the L4978D is adjustable from 3.3V to 50V using a simple external divider.
- What is the efficiency of the L4978D?
The efficiency of the L4978D can be up to 87%.
- What is the operating temperature range for the L4978D?
The operating temperature range for the L4978D is from -40°C to +150°C.
- Does the L4978D support soft-start functionality?
Yes, the L4978D includes a soft-start function.
- Is the L4978D suitable for industrial and automotive applications?
Yes, the L4978D is suitable for both industrial and automotive applications due to its robust features and high reliability.
