Product overview
Description
The L7983 device is a step-down monolithic switching regulator able to deliver up to 300 mA DC based on peak current mode architecture.
The output voltage adjustability ranges from 0.85 V to VIN. The wide input voltage range and adjustable UVLO threshold meet the specification for the 12 V, 24 V and 48 V industrial bus standards.
The “Low Consumption Mode” (LCM) is designed for applications active during idle mode, so it maximizes the efficiency at light load with controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency constant overload current range, meeting the low noise application specification. The L7983 supports dynamic LCM to LNM transition.
The soft-start time is internally fixed and the output voltage supervisor manages the reset phase for any digital load (microcontroller, FPGA, etc.).
The internal compensation network features high noise immunity, simple design and saves on the component cost.
The RST open collector output can also implement output voltage sequencing during the power-up phase.
The synchronous rectification, designed for high efficiency at medium - heavy load, and the high switching frequency capability make the size of the application compact.
Pulse-by-pulse current sensing on both power elements implements an effective constant current protection.
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All features
- 3.5 V to 60 V operating input voltage
- Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to VIN
- 300 mA DC output current
- Dynamic low consumption mode to low noise mode selection
- 10 µA operating quiescent current (L7983PU33R, VIN > 24 V, LCM)
- 2.3 µA shutdown current
- 200 kHz to 2.2 MHz programmable switching frequency
- Optional spread spectrum (dithering)
- Internal soft-start
- Enable / adjustable UVLO threshold
- Synchronization to external clock
- Internal compensation network
- Internal current limiting
- Overvoltage protection
- Output voltage sequencing
- Thermal shutdown
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STMicroelectronics - L7983
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All resources
| Resource title | Version | Latest update | Actions | Details | Download |
|---|
SIMPLIS models (1)
| Resource title | Version | Latest update | Actions | Options | |
|---|---|---|---|---|---|
| ZIP | 2025.07 | 08 Jul 2025 | 08 Jul 2025 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| L7983PU33R | Active Product is in volume production. | DFN 3X3X0.8 10L PITCH 0.5 | Industrial | Ecopack2 | 10 | 2023-06-06T00:00:00.000+02:00 | |
| L7983PU50R | Active Product is in volume production. | DFN 3X3X0.8 10L PITCH 0.5 | Industrial | Ecopack2 | 10 | 2023-06-06T00:00:00.000+02:00 | |
| L7983PUR | Active Product is in volume production. | DFN 3X3X0.8 10L PITCH 0.5 | Industrial | Ecopack2 | 10 | 2023-06-06T00:00:00.000+02:00 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L7983PUR | | | distributors No availability of distributors reported, please contact our sales office | ||||||||||
| L7983PU50R | | | distributors No availability of distributors reported, please contact our sales office | ||||||||||
| L7983PU33R | | | distributors No availability of distributors reported, please contact our sales office |
L7983PUR Active
L7983PU50R Active
L7983PU33R Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors