1
dc2269aaf
DEMO MANUAL DC2269A-A
Description
LTM4676EY
Dual Step-Down µModule Regulator
with PMBus Power System Management
Demonstration circuit 2269A-A is a dual-output, high ef-
ficiency, high density, µModule
®
supply on a small 1.5"×1.2"
PCB board with 4.5V to 26.5V input range. Each output
can supply 13A maximum load current. The demo board
has a
µModule regulator, which is a dual 13A
or single 26A step-down regulator with PMBus power
system management. The DC2269A can be easily inserted
to an edge connector for testing and debugging. It has an
optional input filter inductor (L1) to further reduce input
ripple EMI noise.
DC2269A-A powers up to default settings and produce
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 extensive
power system management features of the part, download
the GUI software LTpowerPlay™ onto your PC and use
L
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
performance summary
LTC’s I
2
C/SMBus/PMBus dongle DC2086A together with
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, cur-
rent, 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 GUI for LTM4676 Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2269A-A
Specifications are at T
A
= 25°C
Figure 1. Dual-Output LTM4676/DC2269A-A Demo Circuit
PARAMETER
CONDITIONS
VALUE
Input Voltage Range
4.5V to 26.5V
Output Voltage, V
OUT0
V
IN
= 4.5V to 26.5V, I
OUT0
= 0A to 13A
0.5V to 4V, Default: 1V
Maximum Output Current, I
OUT0
V
IN
= 4.5V to 26.5V, V
OUT
= 0.5V to 4V
13A
Output Voltage, V
OUT1
V
IN
= 4.5V to 26.5V, I
OUT1
= 0A to 13A
0.5V to 5.4V, Default: 1.8V
Maximum Output Current, I
OUT1
V
IN
= 4.5V to 26.5V, V
OUT
= 0.5V to 5.4V
13A
Typical Efficiency
V
IN
= 12V, V
OUT
= 1.8V, I
OUT
= 13A
86.3%
Default Switching Frequency
500kHz
