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LTM4608A
SIMPLIFIED BLOCK DIAGRAM
SV IN
TRACK
INTERNAL
FILTER
10μF
10μF
10μF
V IN
+
C IN
V IN
2.7 TO 5.5V
MGN
BSEL
PGOOD
M1
SW
MODE
RUN
POWER
CONTROL
0.22μH
V OUT
V OUT
1.5V
CLKIN
CLKOUT
PHMODE
M2
22μF
22pF
C OUT
GND
I TH
PLLLPF
I THM
INTERNAL
COMP
INTERNAL
FILTER
10k
FB
R FB
6.65k
SGND
4608A BD
Figure 1. Simplified LTM4608A Block Diagram
Table 1. Decoupling Requirements. T A = 25°C, Block Diagram Configuration
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
C IN
C OUT
External Input Capacitor Requirement
(V IN = 2.7V to 5.5V, V OUT = 1.5V)
External Output Capacitor Requirement
(V IN = 2.7V to 5.5V, V OUT = 1.5V)
I OUT = 8A
I OUT = 8A
10
100
μF
μF
OPERATION
The LTM4608A is a standalone nonisolated switch mode
DC/DC power supply. It can deliver up to 8A of DC output
current with few external input and output capacitors.
This module provides precisely regulated output voltage
programmable via one external resistor from 0.6V DC to
5.0V DC over a 2.7V to 5.5V input voltage. The typical
application schematic is shown in Figure 18.
The LTM4608A has an integrated constant frequency cur-
rent mode regulator and built-in power MOSFET devices
with fast switching speed. The typical switching frequency
is 1.5MHz. For switching noise sensitive applications, it
can be externally synchronized from 0.75MHz to 2.25MHz.
Even spread spectrum switching can be implemented in
the design to reduce noise.
4608afd
9
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