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LTC3624 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3624
Description  17V, 2A Synchronous Step-Down Regulator with 3.5A Quiescent Current
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3624 Datasheet(HTML) 13 Page - Linear Technology

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LTC3624/LTC3624-2
13
36242fc
For more information www.linear.com/LTC3624
applicaTions inForMaTion
Checking Transient Response
Theregularloopresponsecanbecheckedbylookingatthe
load transient response. Switching regulators take several
cyclestorespondtoastepinloadcurrent.Whenaloadstep
occurs, VOUTimmediatelyshiftsbyanamountequaltothe
∆ILOAD • ESR, where ESR is the effective series resistance
of COUT. ∆ILOAD also begins to charge or discharge COUT
generating a feedback error signal used by the regulator to
return VOUT to its steady-state value. During this recovery
time, VOUT can be monitored for overshoot or ringing that
would indicate a stability problem.
The initial output voltage step may not be within the
bandwidth of the feedback loop, so the standard second
order overshoot/DC ratio cannot be used to determine
phase margin. In addition, a feedforward capacitor can
be added to improve the high frequency response, as
Table 1. Inductor Selection Table
INDUCTOR
INDUCTANCE
(µH)
DCR
(mΩ)
MAX CURRENT
(A)
DIMENSIONS
(mm)
HEIGHT
(mm)
MANUFACTURER
XAL4020 Series
1.0
1.5
2.2
13.25
21.45
35.20
8.7
7.1
5.6
4.3 × 4.3
4.3 × 4.3
4.3 × 4.3
2.1
2.1
2.1
Coilcraft
www.coilcraft.com
XAL4030 Series
3.3
4.7
6.8
26.0
40.1
67.4
5.5
4.5
3.6
4.3 × 4.3
4.3 × 4.3
4.3 × 4.3
3.1
3.1
3.1
IHLP-1616BZ-11 Series
1.0
2.2
24
61
4.5
3.25
4.3 × 4.7
4.3 × 4.7
2
2
Vishay
www.vishay.com
IHLP-2020BZ-01 Series
1
2.2
3.3
4.7
5.6
6.8
18.9
45.6
79.2
108
113
139
7
4.2
3.3
2.8
2.5
2.4
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
5.4 × 5.7
2
2
2
2
2
2
FDV0620 Series
1
2.2
3.3
4.7
18
37
51
68
5.7
4
3.2
2.8
6.7 × 7.4
6.7 × 7.4
6.7 × 7.4
6.7 × 7.4
2
2
2
2
Toko
www.toko.com
MPLC0525L Series
1
1.5
2.2
16
24
40
6.4
5.2
4.1
6.2 × 5.4
6.2 × 5.4
6.2 × 5.4
2.5
2.5
2.5
NEC/Tokin
www.nec-tokin.com
HCP0703 Series
1
1.5
2.2
3.3
4.7
6.8
8.2
9
14
18
28
37
54
64
11
9
8
6
5.5
4.5
4
7 × 7.3
7 × 7.3
7 × 7.3
7 × 7.3
7 × 7.3
7 × 7.3
7 × 7.3
3
3
3
3
3
3
3
Cooper Bussmann
www.cooperbussmann.com
RLF7030 Series
1
1.5
2.2
3.3
4.7
6.8
8.8
9.6
12
20
31
45
6.4
6.1
5.4
4.1
3.4
2.8
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
6.9 × 7.3
3.2
3.2
3.2
3.2
3.2
3.2
TDK
www.tdk.com
WE-TPC 4828 Series
1.2
1.8
2.2
2.7
3.3
17
20
23
27
30
3.1
2.7
2.5
2.35
2.15
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
4.8 × 4.8
2.8
2.8
2.8
2.8
2.8
Würth Elektronik
www.we-online.com



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