SC453 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC453' PDF : 23 Pages View PDF
POWER MANAGEMENT
Applications Information (Cont.)
1. Start-Up:
ISS := 6.5 μA
dtSU := 3 m s
dVdacSU := VMAX_NL
ISS⋅dtSU
CSS_max_startup := dVdacSU
CSS_max_startup
=
1.609
×
−
10
8
F
2. VID Change:
ISSV := 120 μA
dtV := 100 μs
dVdacV := VMAX_NL − VMIN_NL
ISSV⋅dtV
CSS_max_VID := dVdacV
CSS_max_VID
=
4.687
×
−
10
8
F
3. Sleep Entry/Exit:
ISSS := 240 μA
dtS := 33 μs
dVdacS := VMAX_NL − VSLP
ISSS⋅dtS
CSS_max_drs := dVdacS
CSS_max_drs
=
1.714
×
−
10
8
F
Exercise #1 predicts the max capacitance allowed. In
order to allow tolerance, we choose C22 = 15nF.
© 2006 Semtech Corp.
21
SC453
www.semtech.com
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