Linear Technology LTC3875EUJ Demo Manual

DESCRIPTION
Demonstration circuit 2055A is a high efficiency, high
density, 4-phase synchronous buck converter with a 4.5V
to 14V input voltage range. It can supply up to 120A of
load current with a 1.0V output. This demo board has two
each LTC 3875EUJ
®
current mode buck controllers with very low DCR current
sensing capability, on-chip drivers and remote output volt-
age sensing. This board is set up with 0.32mΩ DCR output
inductors. The temperature compensation function can
guarantee accurate current limit over a wide temperature
range with DCR sensing.
The LTC3875 is suitable for inputs from 4.5V to 38V and
outputs up to 3.5V. It can provide a high efficiency, high
power density and versatile power solution for telecom
and datacom systems, industrial, medical instruments,
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
Typical Efficiency, V
OUT
Typical Switching Frequency
Arrow.com.
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feature-rich dual-phase synchronous
CONDITION
V = 4.5 to 14V, I
IN
V = 4.5 to 14V, V
OUT IN
V = 12V, V
IN
DEMO MANUAL DC2055A
High Efficient, Single Output
Synchronous Buck Converter
with Very Low DCR Inductor
and DC power distribution. The LTC3875 is available in a
40-lead 6mm × 6mm QFN package.
To shut down the converter, set the RUN pin voltage below
1.0V (SW1 and SW2: both OFF). Use JP1 jumper to select
Burst Mode
®
continuous mode operation at light load. The switching
frequency is pre-set at about 400kHz, and it can be easily
modified from 250kHz to 720kHz. An onboard dynamic
circuit is also available for a load transient test. Please
see LTC3875 data sheet for more detailed information.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
Specifications are at T = 25°C
A
= 0A to 120A
OUT
= 1.0V
OUT
= 1.0 V, I = 120A
OUT OUT
LTC3875EUJ
operation, pulse-skipping mode or forced
VALUE
4.5V to 14V
1.0V ±2%
120A
87.1%, See Figure 3
400kHz
dc2055afa
1