Overview
The L4973V3.3 is a step-down monolithic power switching regulator produced by STMicroelectronics. This device delivers up to 3.5 A at fixed output voltages of 3.3 V and can be adjusted using a simple external divider to output voltages ranging from 0.5 V to 50 V. Realized in BCD mixed technology, the L4973V3.3 utilizes an internal power D-MOS transistor with a typical RDS(on) of 0.15 Ω, ensuring high efficiency and fast switching times. The regulator operates over a wide input voltage range of 8 V to 55 V and supports switching frequencies up to 300 kHz, making it suitable for a variety of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 8 to 55 | V |
| Fixed Output Voltage | 3.3 V (±1%) | V |
| Adjustable Output Voltage | 0.5 V to 50 V | V |
| Maximum Output Current | 3.5 A | A |
| Switching Frequency | Up to 300 kHz | kHz |
| Power Dissipation (DIP-18) | 5 W (Tpins ≤ 90 °C) | W |
| Power Dissipation (SO-20) | 4 W (Tpins = 90 °C) | W |
| Junction and Storage Temperature | -40 to 150 °C | °C |
Key Features
- Inhibit for zero current consumption (100 mA typ. at VCC = 24 V)
- Input/output synchronization function
- Thermal shutdown
- Protection against feedback disconnection
- Soft-start function
- Output over voltage protection
- Internal current limiting (pulse by pulse and HICCUP mode)
- Zero load current operation (min. 1 mA)
- Precise 5.1 V (1.5%) reference voltage externally available
- Voltage feed forward regulation
Applications
The L4973V3.3 is versatile and can be used in a wide range of applications, including but not limited to:
- 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 L4973V3.3?
The maximum output current of the L4973V3.3 is up to 3.5 A.
- What are the fixed output voltages available for the L4973V3.3?
The fixed output voltage for the L4973V3.3 is 3.3 V (±1%).
- What is the adjustable output voltage range for the L4973V3.3?
The adjustable output voltage range for the L4973V3.3 is from 0.5 V to 50 V.
- What is the input voltage range for the L4973V3.3?
The input voltage range for the L4973V3.3 is from 8 V to 55 V.
- What is the maximum switching frequency of the L4973V3.3?
The maximum switching frequency of the L4973V3.3 is up to 300 kHz.
- Does the L4973V3.3 have thermal shutdown protection?
Yes, the L4973V3.3 includes thermal shutdown protection.
- What types of current limiting does the L4973V3.3 support?
The L4973V3.3 supports pulse by pulse and HICCUP mode current limiting.
- Is there an inhibit function for zero current consumption?
Yes, the L4973V3.3 has an inhibit function for zero current consumption.
- What is the typical RDS(on) of the internal D-MOS transistor?
The typical RDS(on) of the internal D-MOS transistor is 0.15 Ω.
- What are the available package types for the L4973V3.3?
The L4973V3.3 is available in DIP-18 and SO-20 packages.
