DEMO MANUAL DC1780A-A
LTM4620EV: High Efficiency,
PolyPhase 50A Step-Down
Power µModule® Regulator
DESCRIPTION
Demonstration circuit 1780A-A features PolyPhase®
design using the LTM®4620EV, the high efficiency, high
density, dual 13A, switch mode step-down power module
regulator. The input voltage is from 4.5V to 16V. The
output voltage is jumper selectable from 1.0V to 2.5V.
DC1780A-A can deliver nominal 50A output current with 2×
LTM4620s in parallel. As explained in the data sheet, output
current derating is necessary for certain VIN, VOUT, and
thermal conditions. The LTM4620 on DC1780A-A always
operate in continuous conduction mode. The switching
frequency can be programmed through a resistor or can
be synchronized to an external clock signal. The board
allows the user to program how its output voltage ramps up
and down through the TRACK_CONTROL pin. The output
voltage is tightly regulated between “VOUT+” and “VOUT– ”
through remote output voltage sensing which improves
output voltage regulation at heavy loads. These features
and the availability of the LTM4620EV in a compact 15mm
× 15mm × 4.41mm LGA package make it ideal for use in
many high-density point-of-load regulation applications.
The LTM4620 data sheet must be read in conjunction with
this demo manual prior to working on or modifying the
demo circuit DC1780A-A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Figure 1. 50A PolyPhase LTM4620/DC1780A-A Demo Board
dc1780aafa
1
DEMO MANUAL DC1780A-A
PERFORMANCE SUMMARY
PARAMETER
Specifications are at TA = 25°C
CONDITIONS/NOTES
VALUE
Input Voltage Range
4.5V to 16V
Output Voltage VOUT
VIN = 4.5V to 16V, IOUT = 0A to 50A, JP4: 1.0V
1.0V ± 1.5% (0.985V to 1.015V)
Maximum Continuous Output Current
Derating is necessary for certain VIN, VOUT and thermal
conditions, see data sheet for detail.
50A
Default Operating Frequency
500kHz
Resistor Programmable Frequency Range
400kHz to 780kHz
External Clock Sync. Frequency Range
400kHz to 780kHz
Efficiency
VIN = 12V, VOUT = 1.0V, IOUT = 50A, fSW = 500kHz
82.4% See Figure 4
Load Transient
VIN = 12V, VOUT = 1.0V, ISETP = 25A to 50A
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