1
dc2341af
DEMO MANUAL DC2341A
DESCRIPTION
LTC7130EY
20V 20A Monolithic Buck Converter
with Ultra-Low DCR Sensing
Demonstration circuit 2341A is a high efficiency syn-
chronous buck DC/DC converter with 4.5V to 20V input
range. It can supply 20A maximum load current at 1.5V
output. The demo board features the
LTC
®
7130
regulator.
No external MOSFETs are required. It employs an LTC
proprietary current sensing, current mode architecture,
allowing the use of a very low DC resistance (DCR) power
inductor to maximize efficiency in high current applica-
tions. Differential output voltage sensing along with a
precision internal reference combine to offer accurate
output regulation. The LTC7130 is housed in a 6.25mm
× 7.5mm × 2.22mm 63-pin BGA package.
The light load operation mode of the converter is deter-
mined with the MODE/PLLIN pin. Use the JP2 jumper to
select pulse-skipping mode (P.S.), Burst Mode
®
(BURST)
L
, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
PERFORMANCE SUMMARY
or forced continuous mode (CCM) operation. The converter
can also be externally synchronized through the MODE/
PLLIN pin (MODE/PLLIN terminal on the board; JP2: no
jumper or BURST position). To shut down the converter,
one simple way is to force the RUN pin below 1.1V (JP1:
OFF). The power good output (PGOOD terminal) is low
when the output voltage is outside of the ±10% regula-
tion window.
The LTC7130 data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2341A
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
4.5
20
V
Output Voltage
V
IN
= 4.5V to 20V, I
OUT
= 0A to 20A
1.5 ±2%
V
Maximum Output Current
V
IN
= 4.5V to 20V, V
OUT
= 1.5V
20
A
Typical Switching Frequency
530
kHz
Typical Efficiency
V
IN
= 12V, I
OUT
= 20A
89.2
%
Typical Output Voltage Ripple
V
IN
= 12V, I
OUT
= 20A
25
mV
P-P
