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LTM4608
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
CLKIN
CLKOUT
PHMODE
POWER
CONTROL
M2
0.22μH
22μF
22pF
V OUT
V OUT
1.5V
8A
C OUT
GND
I TH
PLLLPF
I THM
INTERNAL
COMP
INTERNAL
FILTER
10k
FB
R FB
6.65k
SGND
4608 BD
Figure 1. Simplified LTM4608 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 LTM4608 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 LTM4608 has an integrated constant frequency current
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.
With current mode control and internal feedback loop
compensation, the LTM4608 module has sufficient stabil-
ity margins and good transient performance with a wide
range of output capacitors, even with all ceramic output
capacitors.
4608fd
9
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