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Getting started with the STEVAL-L6982CDR synchronous step-down switching
Introduction
The
STEVAL-L6982CDR
evaluation board is based on the
delivering up to 2 A DC to the load.
Its wide input voltage range makes the device suitable for a broad range of applications.
The device implements peak current mode architecture in an SO 8L package with internal compensation to minimize design
complexity and size.
The
L6982
is available in low consumption mode version (LCM) as L6982CDR and low noise mode version (LNM) as
L6982NDR.
LCM maximizes efficiency at light load with controlled output voltage ripple, making the device extremely suitable for battery-
powered applications.
LNM makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the
specification for noise sensitive applications.
The EN pin manages the enable/disable function. The typical shutdown current is 2 μA when disabled. When the EN pin is
pulled up, the device is enabled and the internal 1.3 ms soft-start takes place.
Pulse-by-pulse current sensing on both power elements implements effective constant current protection while thermal
shutdown prevents thermal run-away.
Figure 1.
UM2918 - Rev 1 - September 2021
For further information contact your local STMicroelectronics sales office.
regulator evaluation board based on the L6982CDR
L6982CDR
STEVAL-L6982CDR evaluation board (top and bottom views)
synchronous monolithic step-down regulator capable of
UM2918
User manual
www.st.com
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Summary of Contents for ST STEVAL-L6982CDR
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Page 1: Figure 1. Steval-L6982Cdr Evaluation Board (Top And Bottom Views)
UM2918 User manual Getting started with the STEVAL-L6982CDR synchronous step-down switching regulator evaluation board based on the L6982CDR Introduction STEVAL-L6982CDR evaluation board is based on the L6982CDR synchronous monolithic step-down regulator capable of delivering up to 2 A DC to the load. -
Page 2: Getting Started
Overvoltage protection • Output voltage sequencing • Thermal protection • SO 8L package • Synchronization with external clock for LNM devices Block diagram Figure 2. STEVAL-L6982CDR functional block diagram DC Input Input Switching Output LOAD filter regulator filter filter Enable... -
Page 3: Connectors And Test Points
1.6.1 eDesignSuite eDesignSuite software tool developed by STMicroelectronics helps you configure ST products for power conversion applications. You can use it to customize your board for a specific application. After entering the main specifications for your design, you can generate an automatic design or follow a sequential process to build a highly customized design. -
Page 4: How To Use The Board
UM2918 How to use the board How to use the board STEVAL-L6982CDR is configured with L6982 LCM with adjustable V . It is set to deliver a 5 V output voltage with F = 400 KHz. This board is best suited for applications where high efficiency at low current is preferred to output ripple. -
Page 5: Pcb Layout
UM2918 PCB layout PCB layout Figure 3. STEVAL-L6982CDR evaluation board - PCB layout (top layer) Figure 4. STEVAL-L6982CDR evaluation board - PCB layout (bottom layer) UM2918 - Rev 1 page 5/15... -
Page 6: Schematic Diagrams
Schematic diagrams Figure 5. STEVAL-L6982CDR circuit schematic n.m. L1 33uH VOUT n.m. n.m. 22uF 10uF 10uF PGND VIN_L6982 BOOT CLK_IN 100nF 0 Ohm n.m. AGND 10uF EN/SY NC 1uF 10V L6982CDR n.m. 402K VIN_L6982 4.7uH MPZ2012S221A 82.5K 4.7uF n.m. 4.7uF 4.7uF... -
Page 7: Bill Of Materials
UM2918 Bill of materials Bill of materials Table 1. STEVAL-L6982CDR bill of materials Item Q.ty Ref. Part/Value Description Manufacturer Order code 10µF, 1206(3216 Input C3216X7R1H106K160AC Metric), 50V, capacitor +/-10% 1µF, 0805(2012 Input CGA4J3X7R1H105K125A metric) 50V, capacitor +/-10% 1µF, 0603 (1608 metric),... - Page 8 UM2918 Bill of materials Item Q.ty Ref. Part/Value Description Manufacturer Order code 0 Ω, 0603 Boot resistor (1608 metric) 402KΩ, 0603 FB partition (1608 metric), HS resistor +/-1% 82.5KΩ, 0603 FB partition (1608 metric), LS resistor +/-1% 10KΩ, 0603 EN partition (1608 metric), HS resistor +/-1%...
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Page 9: Board Versions
UM2918 Board versions Board versions Table 2. STEVAL-L6982CDR versions Finished good Schematic diagrams Bill of materials STEVAL$L6982CDRA STEVAL$L6982CDRA schematic diagrams STEVAL$L6982CDRA bill of materials 1. This code identifies the STEVAL-L6982CDR evaluation board first version. UM2918 - Rev 1 page 9/15... -
Page 10: Regulatory Compliance
UM2918 Regulatory compliance Regulatory compliance Formal Notice Required by the U.S. Federal Communications Commission FCC NOTICE: This kit is designed to allow: (1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and (2) Software developers to write software applications for use with the end product. -
Page 11: Revision History
UM2918 Revision history Table 3. Document revision history Date Revision Changes 08-Sep-2021 Initial release. UM2918 - Rev 1 page 11/15... -
Page 12: Table Of Contents
UM2918 Contents Contents Getting started ..............2 Safety precautions . -
Page 13: List Of Tables
STEVAL-L6982CDR bill of materials........ -
Page 14: List Of Figures
STEVAL-L6982CDR evaluation board - PCB layout (bottom layer) ....... . - Page 15 ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’...
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