Linear Technology DC1453A Demo Manual

DESCRIPTION
Demonstration circuit 1453A features the LTM
high input voltage, high effi ciency, high density, dual 4A
step-down power module. Derating is necessary for certain
V , V , and thermal conditions. The two outputs are
IN OUT
interleaved with 180° phase to minimize the input ripple
and reduce the input capacitors. A minimum design only
requires the bulk input and output capacitors and voltage
setting resistors. The LTM4619EV features output voltage
tracking, power good indicator, RUN pin control, clock
synchronization and soft-start programming. Protection
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V , V
OUT1 OUT2
Maximum Continuous Output Current
Default Operating Frequency
Effi ciency of Channel 1
Effi ciency of Channel 2
BOARD PHOTO
Dual 4A Step-Down µModule
®
4619EV, the
(T = 25°C)
A
CONDITION
Derating Is Necessary for Certain V
See Datasheet for Details.
JP2 on the 500kHz position.
V = 12V, V = 3.3V, I = 4A, Switching Frequency = 500kHz.
IN OUT1 OUT1
V = 12V, V = 1.8V, I = 4A, Switching Frequency = 500kHz.
IN OUT2 OUT2
DEMO MANUAL DC1453A
LTM4619EV: 4.5V-28V,
features include foldback current limiting and overvolt-
age protection. Burst Mode
mode can be selected for better light load effi ciency. The
LTM4619 data sheet must be read in conjunction with
this demo manual for working on or modifying the demo
circuit 1453A.
Design fi les for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
, V , and Thermal Conditions,
IN OUT
Regulator
® operation or pulse skipping
VALUE
4.5V to 28V
3.3V ±2%, 1.8V ±2%
4A for V , V
DC OUT1 OUT2
500kHz
89.4%, See Figure 3
84.1% See Figure 3
dc1453af
1