SP6122(2003) データシートの表示（PDF） - Signal Processing Technologies
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SP6122 Datasheet PDF : 19 Pages
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Again, for that same 2.2µH application, IPEAK
= 4.6A. Therefore, a 2.2µH inductor with at
least a 5A rating would be desired.
The type of core material to use must also
be determined. For low cost, powdered iron
cores can be used, and they have a gradual
saturation characteristic, but they can cause
ac core loss when the inductor value is low
and ripple current is high. Ferrite cores, on
the other hand, have an abrupt saturation
characteristic and the inductor value drops
sharply when the peak design current is
exceeded. But, ferrites are preferred for
APPLICATION INFORMATION: Continued
high switching frequencies because they
have low core losses as long as the satura-
tion current is avoided.
Table 1 lists examples of both shielded and
unshielded ferrite core inductors for applica-
tions appropriate for SP6122 applications from
2A to 5A output current. The inductors listed
are both shielded and unshielded, the cus-
tomer can decide what is needed for their
application. For the SP6122 Evaluation Board,
the unshielded ferrite inductor 2.2µH Coilcraft
DO3316P-222 was selected for its cost/per-
formance features.
INDUCTORS - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.
Inductance
Manufacturer/
Series R
INDUCTOR SPECIFICATION
Isat
Size LxWxH
Manufacturer
(µH)
Part No.
(Ω)
(A)
(mm)
Inductor Type
Website
1.5 Coilcraft DO3316P-152 0.010 8.0 12.9x9.4x5.0 Unshielded Ferrite Core www.coilcraft.com
2.2 Coilcraft DO3316P-222 0.012 7.0 12.9x9.4x5.0 Unshielded Ferrite Core www.coilcraft.com
3.3 Coilcraft DO3316P-332 0.015 6.4 12.9x9.4x5.0 Unshielded Ferrite Core www.coilcraft.com
1.5 Sumida CDRH104R-1R5 0.006 10.0 10x10x3.8
Shielded Ferrite Core
www.sumida.com
2.5 Sumida CDRH104R-2R5 0.008 7.5 10x10x3.8
Shielded Ferrite Core
www.sumida.com
3.8 Sumida CDRH104R-3R8 0.010 6.0 10x10x3.8
Shielded Ferrite Core
www.sumida.com
1.5 Murata LQN6C1R5M04 0.019 3.7 5.0x5.7x4.7 Unshielded Ferrite Core www.murata.com
2.2 Murata LQN6C2R2M04 0.024 3.2 5.0x5.7x4.7 Unshielded Ferrite Core www.murata.com
3.3 Murata LQN6C3R3M04 0.029 2.7 5.0x5.7x4.7 Unshielded Ferrite Core www.murata.com
CAPACITORS - SURFACE MOUNT & THROUGH HOLE Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.
Capacitance
Manufacturer/
CAPACITOR SPECIFICATION
ESR
Ripple Current Size LxWxH
Voltage Capacitor
Manufacturer
(µF)
Part No.
Ω (max) (A) @ 25°C
470 SANYO 6TPB470M 0.035
3.0
(mm)
7343H
(V)
Type
10.0 SMT Tant.
Website
www.sanyovideo.com
47 TDK C4532X5R0J476M 0.005
4.0
1812
6.3 SMT X5R Cer.
www.tdk.com
4.7 TDK C3216X5R1C475M 0.020
4.0
1206
10.0 SMT X5R Cer.
www.tdk.com
100 SANYO 16SA100M 0.030
2.7
8Dx10L 16.0Thru-hole OS-CON www.sanyovideo.com
PMOS SWITCH - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.
Manufacturer/Part No.
RDS(ON)
Ω @ 3.3V
PMOS SPECIFICATION
Gate Charge
Crss
Id (max)
nc @ 3.3V
(pF)
(A)
Package
Type
Manufacturer
Website
Fairchild PDS6375
0.022
15
300
8
SO-8
www.fairchildsemi.com
Siliconix SI4463DY
0.015
34
800
10
SO-8
www.siliconix.com
Intersil ITF86172SK8T
0.023
17
400
8
SO-8
www.intersil.com
SCHOTTKY DIODE - SURFACE MOUNT Note: Components highlighted in bold are those used on the SP6122 Evaluation Board.
Manufacturer/Part No.
VF @ IF
(V)
IF(AV)
(A)
DIODE SPECIFICATION
Size LxWxH Reverse V
(mm)
(V)
Package
Type
Manufacturer
Website
STMicro STPS2L25U
0.50
4.0
5.5x3.9x2.5 25
SMB
www.st.com
On-Semi MBRD835L
0.50
8.0
9.4x6.7x2.3 35
DPAK
www.onsemi.com
Table 1: SP6122 Component Selection
Rev. 7/16/03
SP6122 Low Voltage, Micro 8, PFET, Buck Controller
11
© Copyright 2003 Sipex Corporation
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