Analog Devices LT7182S Demo Manual

DESCRIPTION
Demonstration Circuit 2836A is a dual-output PolyPhase
DC/DC synchronous step-down regulator with 4V to 20V
input range featuring LT
ply 6A continuous/9A maximum transient load current.
LT7182S is a dual 6A monolithic step-down regulator.
The second-generation Silent Switcher
incorporated into LT7182S to minimize EMI and reduce
PCB layout sensitivity. It also integrates digital power sys-
tem management function allowing for programmability
and telemetry with a PMBus/I
face. Please see LT7182S data sheet for more detailed
information.
The demonstration circuit 2836A runs at 1MHz to mini-
mize solution size. The peak efficiency at 12V input is
83.2% for 1.2V rail and 91.1% for 3.3V rail. The IC tem-
perature rise is 70°C when both channels run at full load,
6A each, at 1MHz.
The demo board has EMI filters installed for both chan-
nels. The conducted and radiated EMI performances of
the board (with EMI filters) are shown in Figure 2. The red
lines in Figure 2 are CISPR25 CLASS 5 limit.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Voltage Range
IN
V Output0 Voltage
OUT0
I Maximum Output0 Current
OUT0
V Output1 Voltage
OUT1
I Maximum Output1 Current
OUT1
f Switching Frequency
SW
EFE Efficiency at DC
Dual Channel 6A, 20V, PolyPhase
Step-Down Silent Switcher with Digital
7182S. Each output can sup-
®
structure is
®
2
C compliant serial inter-
Specifications are at T
CONDITIONS
V
IN
V
IN
DEMO MANUAL DC2836A
Power System Management
DC2836A powers up to default settings and produces
®
power based on configuration resistors without the need
for any serial bus communication. This allows easy evalu-
ation of the DC/DC converter. To fully explore the power
system management features of the part, download the
GUI software LTpowerPlay
2
I C/SMBus/PMBus dongle DC1613A to connect to the
board. LTpowerPlay allows the user to reconfigure the part
on the fly and store the configuration in EEPROM, view
telemetry of voltage, current, temperature and fault status.
GUI Download
The software can be downloaded from:
The LT7182S data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for DC2836A.
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay GUI for LT7182S Quick Start Guide.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
= 25°C
A
= 12V, I = 3A, I = 0A
OUT0 OUT1
= 12V, I = 3A, I = 0A
OUT1 OUT0
LT7182S
onto your PC and use ADI's
®
LTpowerPlay
available.
MIN TYP MAX
4 20
1.2
9
3.3
9
0.925 1 1.075
83.2
91.1
UNITS
V
V
A
V
A
MHz
%
%
Rev. 0
1