Datasheet

LTC3425
19
3425f
APPLICATIO S I FOR ATIO
WUUU
L1
2.7µH
C
IN
2.2µF
R
LIM
75k
R
T
12.1k
L2
2.7µH
L3
2.7µH
L4
2.7µH
D4
C
IN
: TAIYO YUDEN JMK107BJ225MA
C
S
: TAIYO YUDEN LMK107BJ474KA
C
OUT
: TAIYO YUDEN JMK212BJ475MG (×4)
C
BULK
: AVX TPSD157M006R0050
V
IN
V
OUT
SWA
V
IN
3.3V
SWB
LTC3425
SWC SWD
SGND
SHDN
V
OUTS
V
OUTA
V
OUTB
V
OUTC
V
OUTD
REFOUT
CCM
REFEN
SYNCIN
BURST
R
T
I
LIM
PGOOD
SYNCOUT
SS
FB
COMP
GNDA GNDB GNDC GNDD
C2
220pF
3425 F07
C
OUT
4.7µF
×4
C
SS
0.01µF
C
S
0.47µF
×2
Q1
C
BULK
150µF
6.3V
R3
100k
R2
309k
R4
100k
PGOOD
R1
100k
V
OUT
5V
2.5A
+
D3
D2
D1
D1 TO D4: MOTOROLA MBR0520L
L1 TO L4: TDK RLF5018T-2R7M1R8
Q1: ZETEX ZXM61P02F
L1
2.7µH
C
IN
2.2µF
R
LIM
75k
R
T
12.1k
L2
2.7µH
L3
2.7µH
L4
2.7µH
D4
C
IN
: TAIYO YUDEN JMK107BJ225MA
C
OUT
: TAIYO YUDEN JMK212BJ475MG (×4)
C
BULK
: AVX TPSD157M006R0050
V
IN
V
OUT
SWA
V
IN
3.3V
SWB
LTC3425
SWC SWD
SGND
SHDN
V
OUTS
V
OUTA
V
OUTB
V
OUTC
V
OUTD
REFOUT
CCM
REFEN
SYNCIN
BURST
R
T
I
LIM
PGOOD
SYNCOUT
SS
FB
COMP
GNDA GNDB GNDC GNDD
C2
220pF
3425 F08
C
OUT
4.7µF
×4
C
SS
0.01µF
C
BULK
150µF
6.3V
R3
100k
R2
309k
R4
100k
PGOOD
R1
100k
V
OUT
5V
2.5A
+
D3
D2
D1
D1 TO D4: MOTOROLA MBR0520LT1
L1 TO L4: TDK RLF5018T-2R7M1R8
Figure 7. Application Circuit for V
OUT
> 4.3V with Inrush Limiting and Output Disconnect
Figure 8. Application Circuit for V
OUT
> 4.3V When Inrush Limiting and Output Disconnect are Not Required