LTM4618
PIN FUNCTIONS
additional decoupling of the 5V internal regulator.
V OUT (BANK 3: J1-J4, K1-K4, L1-L4, M1-M4): Power Out-
put Pins. Apply output load between these pins and PGND
pins. Recommend placing output decoupling capacitance
to check the switching frequency. Leave pin ?oating. A
resistor-capacitor snubber can be placed from SW to
PGND to eliminate high frequency switch node ringing.
See the Applications Information section.
directly between these pins and PGND pins.
SW (K6): Switching Node of the Circuit. This pin is used
SIMPLIFIED BLOCK DIAGRAM
≤6V V IN
TIE V IN , INTV CC AND
EXTV CC TOGETHER
INTERNAL
V IN
EXTV CC
FILTER
1.5μF
+
C IN
4.5V TO 26.5V
INTV CC
MODE/PLLIN
M1
PGND
SW
TK/SS
RUN
PGOOD
C SS
POWER
CONTROL
M2
1.5μH
10μF
+
V OUT
2.5V/6A
C OUT
COMP
INTERNAL
PGND
FREQ
INTV CC
COMP
INTERNAL
FILTER
60.4k
R FB
28k
V FB
SGND
4618 F01
Figure 1. Simpli?ed LTM4618 Block Diagram
DECOUPLING REQUIREMENTS
T A = 25°C. Use Figure 1 con?guration.
SYMBOL
C IN
PARAMETER
External Input Capacitor Requirement
CONDITIONS
I OUT = 6A
MIN
10
TYP
MAX
UNITS
μF
(V IN = 4.5V to 26.5V, V OUT = 2.5V)
C OUT
External Output Capacitor Requirement
I OUT = 6A
200
μF
(V IN = 4.5V to 26.5V, V OUT = 2.5V)
4618fa
8
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