1
dc2312afb
DEMO MANUAL
DC2312A-A/DC2312A-B
DESCRIPTION
LTC3882EUJ-1 High Efficiency
Step-Down DC/DC Converter
with Power System Management
Demonstration circuit 2312A is a high current, high
efficiency, dual phase synchronous buck converter
featuring the
LTC3882EUJ-1
, a dual output voltage
mode controller with the additional features of dif-
ferential V
OUT
sense and dedicated PGOOD output on
both channels, compared to LTC3882. The LTC3882-1
has the PMBus interface and power system manage-
ment functions.
There are two versions of the boards available:
n
DC2312A-A:
Dual phase dual output configuration. De-
fault output setting V
OUT0
= 1.5V/35A, V
OUT1
= 1.0V/35A.
n
DC2312A-B:
Dual phase single output configuration.
Default output setting V
OUT0
= 1.0V/70A.
The DC2312A powers up to default settings and pro-
duces power based on configuration resistors or with
its nonvolatile memory without the need for any serial
bus communication. This allows easy evaluation of the
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
PERFORMANCE SUMMARY
DC/DC converter. To fully explore the extensive power
system management features of the part, download the
GUI software LTpowerPlay™ onto your PC and use LTC’s
I
2
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 settings within
its onboard EEPROM, along with viewing telemetry pa-
rameters that include voltage, current, temperature and
fault status.
GUI Software LTpowerPlay Download
The software can be downloaded from:
http://www.linear.com/LTpowerPlay
Design files for this circuit board are available at
http://www.linear.com/demo/DC2312A
Specifications are at T
A
= 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
7
12
14
V
V
OUT0
Output Voltage Range (-A Version)
I
OUT0
= 0A to 35A, V
IN
= 7V to 14V
0.5
1.5
2.0*
V
I
OUT0
Output Current Range (-A Version)
0
35**
A
V
OUT1
Output Voltage Range (-A Version)
I
OUT1
= 0A to 35A, V
IN
= 7V to 14V
0.5
1.0
2.0*
V
I
OUT1
Output Current Range (-A Version)
0
35**
A
V
OUT0
Output Voltage Range (-B Version)
I
OUT0
= 0A to 70A, V
IN
= 7V to 14V
0.5
1.0
2.0*
V
I
OUT0
Output Current Range (-B Version)
0
70**
A
F
SW
Factory Default Switching (-A Version)
500
kHz
F
SW
Factory Default Switching (-B Version)
450
kHz
EFFICIENCY
Full Load Efficiency (-A Version)
V
OUT0
= 1.5V, I
OUT0
= 35A, See Figure 5
90.6
%
V
OUT1
= 1.0V, I
OUT1
= 35A, See Figure 5
88.0
%
Full Load Efficiency (-B Version)
V
OUT0
= 1.0V, I
OUT0
= 70A, See Figure 6
87.8
%
*Note: The DC2312A uses 2.5V-rated low ESR PosCAP (Part No. 2R5TPE470M7) as output capacitors for optimized load transient performance.
If > 2.0V V
OUT
is needed, 4V or 6.3V-rated output capacitors should be used.
**Note: When continuously running at full load, forced air flow is needed.
