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AN2620 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2620
Description  3 A high-frequency synchronous 900 kHz
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2620 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2620
2/20
Doc ID 13883 Rev 3
Contents
1
Application information component selection . . . . . . . . . . . . . . . . . . . . 4
1.1
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3
Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Board usage recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
External component selection for the ST1S10 demonstration board . . . . 13
4.2
Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3
Capacitors selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4
Heavy capacitive load condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5
Low output voltage (Vout < 2.5 V) and 2.5 V < Vin < 8 V . . . . . . . . . . . . . 14
4.6
Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5
Layout thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19


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