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AN2808 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN2808
Description  The PM6670S device is a complete
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2808 Datasheet(HTML) 3 Page - STMicroelectronics

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AN2808
Contents
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10.5
VDDQ efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10.6
VDDQ gate drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
10.7
VDDQ, VTT and VTTREF turn off (soft end) . . . . . . . . . . . . . . . . . . . . . . 23
10.7.1
Tracking discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
10.7.2
Non-traking discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
10.8
UV, OV and thermal protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10.8.1
Latched UV protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10.8.2
Latched OV protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10.9
VTT current limit (foldback) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.10 Switching frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.10.1
Switching frequency vs input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.10.2
Switching frequency vs output current . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.11 Thermal behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.12 DDR memories (VDDQ = 2.5 V) characterization . . . . . . . . . . . . . . . . . . 32
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39



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