Overview
The L4973V5.1 is a high-performance step-down monolithic power switching regulator produced by STMicroelectronics. This device is capable of delivering up to 3.5 A of output current at fixed voltages of 5.1 V, with adjustable output voltages ranging from 5.1 V to 50 V. The L4973V5.1 is realized in BCD mixed technology, utilizing an internal power D-MOS transistor to achieve high efficiency and fast switching times. It operates over a wide input voltage range of 8 V to 55 V, making it suitable for a variety of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 8 to 55 | V |
| Output Voltage (Fixed) | 5.1 V (±1%) | V |
| Adjustable Output Voltage Range | 5.1 V to 50 V | V |
| Maximum Output Current | 3.5 A | A |
| Switching Frequency | Up to 300 kHz | kHz |
| Internal Current Limiting | Pulse by pulse and HICCUP mode | - |
| Reference Voltage (Externally Available) | 5.1 V (±1.5%) | V |
| Thermal Shutdown | Yes | - |
| Output Over Voltage Protection | Yes | - |
| Soft-Start Function | Yes | - |
| Efficiency (Typical) | Up to 90% at VO = 5.1 V, IO = 3.5 A | % |
| RDS(on) of Internal D-MOS Transistor | Typically 0.15 Ω | Ω |
Key Features
- Up to 3.5 A step-down converter
- Operating input voltage from 8 V to 55 V
- Fixed output voltages of 5.1 V (±1%) and adjustable outputs from 5.1 V to 50 V
- Frequency adjustable up to 300 kHz
- Voltage feed forward and zero load current operation (minimum 1 mA)
- Internal current limiting (pulse by pulse and HICCUP mode)
- Precise 5.1 V (±1.5%) reference voltage externally available
- Input/output synchronization function
- Inhibit for zero current consumption (typically 100 mA at VCC = 24 V)
- Protection against feedback disconnection and thermal shutdown
- Output over voltage protection and soft-start function
Applications
The L4973V5.1 is versatile and can be used in a wide range of applications, including:
- Industrial power supplies
- Automotive systems
- Telecommunication equipment
- Medical devices
- Consumer electronics requiring high-efficiency DC-DC conversion
Q & A
- What is the maximum output current of the L4973V5.1?
The maximum output current of the L4973V5.1 is 3.5 A.
- What is the input voltage range of the L4973V5.1?
The input voltage range is from 8 V to 55 V.
- What are the fixed output voltages available for the L4973V5.1?
The fixed output voltage is 5.1 V (±1%).
- Can the output voltage be adjusted?
Yes, the output voltage can be adjusted from 5.1 V to 50 V using an external resistive divider.
- What is the maximum switching frequency of the L4973V5.1?
The maximum switching frequency is up to 300 kHz.
- Does the L4973V5.1 have internal current limiting?
Yes, it has internal current limiting in pulse by pulse and HICCUP mode.
- Is thermal shutdown protection available?
Yes, the L4973V5.1 includes thermal shutdown protection.
- What is the typical efficiency of the L4973V5.1 at full load?
The typical efficiency is up to 90% at VO = 5.1 V and IO = 3.5 A.
- How does the soft-start function work?
The soft-start function helps in reducing the inrush current during startup by gradually increasing the output voltage.
- Can the L4973V5.1 be synchronized with other regulators?
Yes, it has an input/output synchronization function.
