Key facts
- Brand
- STMicroelectronics
- Model
- L4973
- Category
- Power Management
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-10
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ST L4973 3.5 A step down switching regulator handbook
L4973 is a 3.5A step-down monolithic power switching regulator that delivers 3.3V or 5.1V at fixed voltages and uses a simple external divider to output adjustable voltage up to 50V. The device uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15Ω) to obtain very high efficiency and very fast switching times. Switching frequency up to 300 kHz are achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8 V to 55 V and output voltages regulated from 3.3 V to 40 V cover the majority of the today applications. Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protect.
Read onlineSTMicroelectronics L4973 specifications
| Input Voltage range | 8V-30V |
|---|---|
| Output Voltage | 5.1V +3% |
| Switching frequency | 200kHz |
| Output Current range | Oto 7A |
Source: STMicroelectronics AN1126 Current Sharing Application Note for L4973
All STMicroelectronics L4973 documents by type
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the maximum output current for two L4973 devices in a current sharing configuration?
Using two L4973D devices, it is possible to deliver up to 7A with good sharing between the two sections.
From: STMicroelectronics AN1126 Current Sharing Application Note for L4973
How does multiphase operation improve efficiency compared to synchronized PWMs?
Multiphase application reduces the RMS current through the input capacitor, which minimizes wasted power and heat dissipation.
From: STMicroelectronics AN1126 Current Sharing Application Note for L4973
What are the available versions of the L4973?
The L4973V3.3 sets the output voltage at 3.3 V, and the L4973V5.1 sets it at 5.1 V.
From: STMicroelectronics AN938 Designing with L4973 DC-DC Converter Application Note
Can the L4973 control output voltages higher than its fixed versions?
Yes, both regulators can control higher output voltage values by using an external voltage divider.
From: STMicroelectronics AN938 Designing with L4973 DC-DC Converter Application Note