DC1400A Linear Technology, DC1400A Datasheet - Page 9

• Manufacturer Part Number: DC1400A
• Description: BOARD EVAL LTM4608
• Manufacturer: Linear Technology
• Series: LTM®r

Specifications of DC1400A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V
• Current - Output: 8A
• Voltage - Input: 2.5 ~ 5.5 V
• Regulator Topology: Buck
• Frequency - Switching: 1.5MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LTM4608
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Table 1. Decoupling Requirements. T
SYMBOL
C
C
OPERATION
SIMPLIFIED BLOCK DIAGRAM
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.
IN
OUT
PHMODE
CLKOUT
PLLLPF
PGOOD
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
INTERNAL
= 2.7V to 5.5V, V
= 2.7V to 5.5V, V
COMP
INTERNAL
FILTER
A
OUT
OUT
= 25°C, Block Diagram Configuration
= 1.5V)
= 1.5V)
Figure 1. Simplified LTM4608A Block Diagram
INTERNAL
CONTROL
POWER
FILTER
CONDITIONS
I
I
OUT
OUT
= 8A
= 8A
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.
M1
M2
0.22µH
10µF
22µF
10µF
10k
MIN
10µF
10
22pF
V
SW
V
GND
FB
4608A BD
IN
OUT
+
LTM4608A
TYP
100
R
6.65k
FB
C
IN
C
OUT
V
2.7 TO 5.5V
V
1.5V
IN
OUT
MAX
UNITS
4608afc
9
µF
µF