Product overview
Description
The STEVAL-L7983V33 product evaluation board is a step-down switching power supply based on the L7983PU33R regulator in a DFN10 3x3 mm package with fixed 3.3 V output voltage. The programmed switching frequency is 1 MHz and it can be adjusted by applying an external clock on LNM/LCM pin or by changing the frequency programming resistor.
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 wide input voltage range and adjustable UVLO threshold meet the specification for the 12 V, 24 V and 48 V industrial bus standards.
L7983 supports dynamic Low Consumption Mode (LCM) to Low Noise Mode (LNM) transition.
LCM is designed for applications which remain active in idle mode to maximize the efficiency under light load condition with controlled output voltage ripple. LNM makes the switching frequency constant over load current range, meeting the low noise application specification.
The soft start time is internally fixed and the output voltage supervisor manages the reset phase for any digital load (µC, FPGA, etc.).
The internal compensation network features high noise immunity, simple design and component cost reduction. The RST open collector output can also implement output voltage sequencing during the power-up phase.
Synchronous rectification, designed for high efficiency under medium to heavy load, and the high switching frequency capability reduce the application size. 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
- Step-down (buck) conversion
- 3.3 V output voltage
- 300 mA DC max. output current
- 1 MHz selected switching frequency
- Dynamic Low Consumption Mode to Low Noise Mode selection
- Internal soft-start
- Synchronization to external clock
- Internal compensation network
- Auto recovery overcurrent, overvoltage and thermal protection
- RoHS and China RoHS compliant
- WEEE compliant (2012/19/UE RAEE II)
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All resources
| Resource title | Version | Latest update | Actions | Details | Download |
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SIMPLIS models (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 2025.07 | 24 Jul 2025 | 24 Jul 2025 |
Board Manufacturing Specifications (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 1.0 | 06 Oct 2020 | 06 Oct 2020 |
Bill of Materials (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| 1.0 | 06 Oct 2020 | 06 Oct 2020 |
Schematic Pack (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| 1.0 | 06 Oct 2020 | 06 Oct 2020 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | WEEE Compliant | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|---|
| STEVAL-L7983V33 | Active Product is in volume production. | CARD | Industrial | Ecopack2 | Yes | - | - | |
STEVAL-L7983V33
Package:
CARDMaterial Declaration**:
(**) 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) | Supplier | Core Product | Board production status | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| STEVAL-L7983V33 | | | distributors No availability of distributors reported, please contact our sales office |
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STEVAL-L7983V33 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