LTC3425_15 Datasheet, PDF (19/24 Pages) Linear Technology – 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter

LTC3425
APPLICATIO S I FOR ATIO
V_IN
3.3V
C_IN
2.2µF
L1
L2
L3
L4
2.7µH 2.7µH 2.7µH 2.7µH _D1
D2
D3
D4
C_S
0.47µF
×2
V_OUT
R_T
12.1k
V_IN
SHDN
REFOUT
CCM
REFEN
SYNCIN
BURST
R_T
I_LIM
R_LIM
75k
SGND
SWA
SWB
SWC
SWD
V_OUTS
V_OUTA
V_OUTB
V_OUTC
V_OUTD
LTC3425
GNDA
GNDB
FB
COMP
SS
SYNCOUT
PGOOD
GNDC GNDD
Q1
C_OUT
4.7µF
×4
+
R2 R4
309k 100k
C_BULK
150µF
6.3V
V_OUT
5V
2.5A
C2
220pF
R1
100k
C_SS
0.01µF
R3
100k
PGOOD
C_IN: TAIYO YUDEN JMK107BJ225MA
C_S: TAIYO YUDEN LMK107BJ474KA
C_OUT: TAIYO YUDEN JMK212BJ475MG (×4)
C_BULK: AVX TPSD157M006R0050
D1 TO D4: MOTOROLA MBR0520L
L1 TO L4: TDK RLF5018T-2R7M1R8
Q1: ZETEX ZXM61P02F
3425 F07
Figure 7. Application Circuit for V_OUT > 4.3V with Inrush Limiting and Output Disconnect
V_IN
3.3V
C_IN
2.2µF
L1
L2
L3
L4
2.7µH 2.7µH 2.7µH 2.7µH _D1
D2
D3
D4
V_OUT
R_T
12.1k
V_IN
SHDN
REFOUT
CCM
REFEN
SYNCIN
BURST
R_T
I_LIM
R_LIM
75k
SGND
SWA
SWB
SWC
SWD
V_OUTS
V_OUTA
V_OUTB
V_OUTC
V_OUTD
LTC3425
GNDA
GNDB
FB
COMP
SS
SYNCOUT
PGOOD
GNDC GNDD
C_OUT
4.7µF
×4
+
R2 R4
309k 100k
C_BULK
150µF
6.3V
V_OUT
5V
2.5A
C2
220pF
R1
100k
R3
100k
C_SS
0.01µF
PGOOD
C_IN: TAIYO YUDEN JMK107BJ225MA
C_OUT: TAIYO YUDEN JMK212BJ475MG (×4)
C_BULK: AVX TPSD157M006R0050
D1 TO D4: MOTOROLA MBR0520LT1
L1 TO L4: TDK RLF5018T-2R7M1R8
3425 F08
Figure 8. Application Circuit for V_OUT > 4.3V When Inrush Limiting and Output Disconnect are Not Required
3425f
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