Linear Technology DC2142A Demo Manual

Description
Demonstration circuit 2142A is a high efficiency, high
density, 4-phase synchronous buck converter with a 4.5V
to 14V input range. It can supply 120A maximum load
current at a 1.0V output. This demo board incorporates
the LTC3875EUJ and LTC3874IUFD controllers.
The LTC 3875 is a feature-rich dual phase synchronous
®
buck controller with very low DCR current sensing capa-
bility, on-chip drivers and remote output voltage sens-
ing. The LTC3874 is a compact dual phase synchronous
buck phase extender with very low DCR current sensing
capability, on-chip drivers and immediate response to
master IC's fault.
This board is setup with 0.32mΩ DCR inductor. The tem-
perature compensation function guarantees accurate cur-
rent limit over a wide temperature range with DCR sensing.
The DC2142 can provide high efficiency, high power density
and compact solutions for telecom and datacom systems,
performance summary
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
Typical Efficiency, V
OUT
Typical Switching Frequency
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High Efficiency, Single-Output Synchronous
Buck Converter with Very Low DCR Inductor
CONDITIONS
V = 4.5V to 14V, I
IN
V = 4.5V to 14V, V
OUT IN
V = 12V, V
IN
DEMO MANUAL DC2142A
LTC3875EUJ & LTC3874IUFD
industrial and medical instruments, DC power distribution
systems and computer systems. The LTC3875 is available
in a 40-pin 6mm × 6mm QFN package. The LTC3874 is
available in a 28-lead (4mm × 5mm) QFN Package.
To shut down the converter, set the RUN pin voltage be-
low 1.4V (SW1: OFF). Use the JP1 jumper to select burst
mode, pulse skipping mode or forced continuous mode
operation at light load. Switching frequency is preset at
about 400kHz, and it can be easily modified from 250kHz
to 770kHz. An on-board dynamic circuit is also available
for transient test. The LTC3875 and LTC3874 data sheets
give a complete description of these parts, and must be
read in conjunction with this DC2142A quick start guide
Design files for this circuit board are available at
http://www.linear.com/demo/DC2142A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T = 25°C
A
= 0A to 120A
OUT1
= 1.0V
OUT1
= 1.0 V, I = 120A
OUT1 OUT1
VALUE
4.5V to 14V
1.0V ±2%
120A
87.4%
400kHz
dc2142af
1