Key facts
- Brand
- STMicroelectronics
- Model
- L5973AD
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-10
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STMicroelectronics L5973AD Switching Regulator User Manual
The L5973AD is a 2 A step‑down switching regulator with an internal P‑channel MOSFET, fixed 500 kHz switching frequency and a 3.3 V reference. It operates from 4.4 V to 36 V input and delivers an adjustable output from 1.235 V to 35 V, suitable for consumer, networking, computer and industrial applications.
The manual details the functional blocks, pin functions, thermal data, electrical specifications, protection features (over‑voltage, thermal shutdown, feedback disconnection) and synchronization options. It also includes application circuits, revision history and regulatory notices.
STMicroelectronics L5973AD specifications
| Operating input voltage range | 4.4 V to 36 V |
|---|---|
| Adjustable output voltage range | 1.235 V to 35 V |
| Switching frequency | 500 kHz (fixed) |
| Maximum output current | 2 A (switch current limit) |
| Efficiency (typical) | 90 % (Vo=5 V, Vcc=12 V) |
| Quiescent current | 5.7 mA (total operating) |
| Operating temperature range | -40 °C to 150 °C |
Source: STMicroelectronics L5973AD Switching Regulator User Manual
All STMicroelectronics L5973AD documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the main drawback of using a standard DC-DC converter to drive LEDs?
The main drawback is the amount of wasted power on the sense resistor, which affects overall application efficiency.
From: STMicroelectronics AN2823 Application Note Current Source for LED Driving Based on L5973AD
How can the voltage drop across the sense resistor be decreased?
By using two additional resistors to implement a trick that decreases the magnitude of the regulated voltage across the sense resistor.
From: STMicroelectronics AN2823 Application Note Current Source for LED Driving Based on L5973AD
What is the maximum input voltage the L5973AD can handle?
The device can operate with an input voltage up to 36 V.
From: STMicroelectronics L5973AD Switching Regulator User Manual
At what temperature does the thermal shutdown activate?
Thermal shutdown triggers when the chip temperature exceeds 150 °C.
From: STMicroelectronics L5973AD Switching Regulator User Manual