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LTM4619
SIMPLIFIED BLOCK DIAGRAM
INTERNAL
FILTER
1.5μF
+
C IN
V IN
4.5V TO 26.5V*
V IN
INTV CC
PGOOD
MODE/PLLIN
EXTV CC
TK/SS1
M1
M2
L1
1.5μH
10μF
+
PGND
SW1
V OUT1
2.5V/4A
C OUT1
R1
R2
C SS1
RUN1
COMP1
60.4k
PGND
V FB1
? ? R1 + R2 ? ? ? V IN
?   R2   ?
= UVLO THRESHOLD = 1.22V
TK/SS2
C SS2
RUN2
COMP2
INTERNAL
COMP
POWER
CONTROL
M3
M4
L2
1.5μH
1.5μF
10μF
+
R SET1
28k
PGND
SW2
V OUT2
3.3V/4A
C OUT2
FREQ
SGND
INTERNAL
COMP
INTERNAL
FILTER
60.4k
PGND
V FB2
R SET2
19.1k
4619 BD
*USE EXTV CC FOR V IN ≤ 5.5V, OR TIE V IN AND EXTV CC TOGETHER FOR V IN ≤ 5.5V
Figure 1. Simplified LTM4619 Block Diagram
DECOUPLING REQUIREMENTS
T A = 25°C. Use Figure 1 configuration.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
C IN
C OUT1
C OUT2
External Input Capacitor Requirement
(V IN = 4.5V to 26.5V, V OUT1 = 2.5V, V OUT2 = 3.3V)
External Output Capacitor Requirement
(V IN = 4.5V to 26.5V, V OUT1 = 2.5V, V OUT2 = 3.3V)
I OUT1 = 4A, I OUT2 = 4A
I OUT1 = 4A
I OUT2 = 4A
10
200
200
μF
μF
μF
4619fb
For more information www.linear.com/LTM4619
7
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