LTM4628
SIMPLIFIED BLOCK DIAGRAM
PGOOD1
TRACK1
V IN
100μA =
V IN
R T
V IN
SS CAP
R T TEMP
CLKOUT
RUN1
MODE_PLLIN
PHASEMD
MTOP1
MBOT1
0.68μH
1μF
2.2μF
GND
SW1
V OUT1
GND
+
C IN1
10μF
35V
1.5V/8A
C OUT1
C IN2
10μF
35V
V OUTS1
COMP1
60.4k
V FB1
SGND
INTERNAL
COMP
POWER
CONTROL
PGOOD2
R FB1
40.2k
TRACK2
V IN
SS CAP
INTV CC
4.7μF
EXTV CC
MTOP2
1μF
GND
SW2
C IN3
10μF
35V
C IN4
10μF
35V
RUN2
MBOT2
0.68μH
2.2μF
V OUT2
GND
+
1.2V/8A
C OUT2
V OUTS2
+ –
COMP2
f SET
INTERNAL
COMP
XI
60.4k
V FB2
R FB2
60.4k
R fSET
SGND
INTERNAL
FILTER
DIFFOUT
DIFFN
DIFFP
Figure 1. Simplified LTM4628 Block Diagram
4628 BD
DECOUPLING REQUIREMENTS
T A = 25°C. Use Figure 1 configuration.
SYMBOL
C IN1 , C IN3
C IN2 , C IN4
C OUT1
C OUT2
PARAMETER
External Input Capacitor Requirement
(V IN1 = 4.5V to 26.5V, V OUT1 = 1.5V)
(V IN2 = 4.5V to 26.5V, V OUT2 = 1.5V)
External Output Capacitor Requirement
(V IN1 = 4.5V to 26.5V, V OUT1 = 1.5V)
(V IN2 = 4.5V to 26.5V, V OUT2 = 1.5V)
CONDITIONS
I OUT1 = 8A
I OUT2 = 8A
I OUT1 = 8A
I OUT2 = 8A
MIN
TYP
22
22
300
300
MAX
UNITS
μF
μF
μF
μF
4628fe
For more information www.linear.com/LTM4628
9
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