LTM4601/ LINER [Linear Technology], LTM4601/ Datasheet - Page 9

• Manufacturer Part Number: LTM4601/
• Description: Low VIN, 8A DC/DC ?Module Regulator
• Manufacturer: LINER [Linear Technology]

Table 1. Decoupling Requirements. T
SYMBOL
C
C
operaTion
siMpliFieD block DiagraM
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
IN
OUT
PHMODE
CLKOUT
PGOOD
PLLLPF
TRACK
MODE
CLKIN
SGND
BSEL
MGN
SV
I
RUN
THM
I
TH
IN
PARAMETER
External Input Capacitor Requirement
(V
External Output Capacitor Requirement
(V
IN
IN
= 2.7V to 5.5V, V
= 2.7V to 5.5V, V
INTERNAL
COMP
INTERNAL
FILTER
A
OUT
OUT
= 25°C, Block Diagram Configuration.
= 1.5V)
= 1.5V)
Figure 1. Simplified LTM4608 Block Diagram
INTERNAL
CONTROL
POWER
FILTER
CONDITIONS
I
I
OUT
OUT
= 8A
= 8A
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.
M1
M2
0.22µH
10µF
22µF
10µF
10k
MIN
10
10µF
22pF
V
SW
GND
FB
4608 BD
V
TYP
100
IN
OUT
+
LTM4608
R
6.65k
FB
C
IN
C
OUT
MAX
V
2.7 TO 5.5V
V
1.5V
8A
IN
OUT
UNITS
4608fd
9
µF
µF