1
dc1936afa
DEMO MANUAL DC1936A
DESCRIPTION
LTC3882EUJ
Dual Output Step-Down DC/DC Controller
with Power System Management
Demonstration circuit 1936A is a high current, high ef-
ficiency, polyphase synchronous buck converter featuring
the
LTC3882EUJ
, a dual output polyphase voltage mode
controller. The LTC3882 has the PMBus interface and
power system management functions.
The DC1936A uses 6mm × 6mm DrMOS as the power
stage. The input range of this board is from 7V to 14V,
and the output voltage can be programmed from 0.8V to
1.8V. The DC1936A provides two outputs, with each output
capable of 1V/30A. The DC1936A has optional discrete
driver (LTC4449EDCB) and MOSFET footprints for high
input voltage applications up to 38V. The DC1936A also
has an on-board dynamic load circuit, which makes it easy
for the customer to evaluate the transient performances.
The DC1936A powers up to default settings and pro-
duces power based on configuration resistors or with its
non-volatile memory without the need for any serial bus
communication. This allows easy evaluation of the DC/
DC converter. To fully explore the extensive power system
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
management features of the parts, 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 parameters that
include voltage, current, temperature and fault status.
GUI Download
The software can be downloaded from:
http://www.linear.com/ltpowerplay
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay for LTC3880 Quick Start Guide. The
LTC3882 operation in LTpowerPlay is similar to that of
the LTC3880.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1936A
Specifications are at T
A
= 25°C
*Note:
The DC1936A uses 4V-rated low ESR PosCAP (Part No. 4TPF470ML) as output capacitors for optimized load transient performance. If >3.6V V
OUT
is needed, 6.3V-rated output capacitors should be used.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
7
12
14
V
V
OUT0,1
Output Voltage Range
I
OUT
= 0A TO 30A, V
IN
= 7V to 14V
0.8
1
1.8*
V
I
OUT0,1
Output Current Range
0
30
A
f
SW
Factory Default Switching
500
kHz
EFF
Peak Efficiency
V
IN
= 12V, V
OUT0
= 1V, See Figure 4
90.4
%
LOAD TRANSIENT Output Voltage Peak-to-Peak Spike During
Load Transient
V
IN
= 12V, V
OUT0
= 1V, I
STEP
= 0A – 7.5A
30
mV
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