1
dc1367af
DEMO MANUAL DC1367A
DESCRIPTION
LTM4615EV:
Dual DC/DC Step-Down
µModule Regulator with LDO
Demonstration circuit 1367A features the LTM
®
4615EV, a
triple output μModule
®
regulator consisting of two switch
mode outputs and one LDO output. Each LTM4615 DC/DC
converter has a separate input and enable pin. The LTM4615
maximum load current is 4A for each switch mode channel
and 1.5A for the VLDO™ channel. However the DC1367A
is configured with the LDO input supply connected to
the VOUT2 whose maximum output current decreases
accordingly. Derating is necessary for certain V
IN
, V
OUT
L
, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks
and VLDO is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
BOARD PHOTO
PERFORMANCE SUMMARY
(T
A
= 25°C)
and thermal conditions. The LTM4615 data sheet must be
read in conjunction with this manual prior to working on
or modifying DC1367A.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER
CONDITION
VALUE
Input Voltage Range
Both Switch Mode Outputs (V
IN1
and V
IN2
)
2.5V to 5.5V
Output Voltage V
OUT1
DC Voltage, V
IN1
= 3.3V, I
OUT1
= 4A
1.8V ±2%
Output Voltage V
OUT2
DC Voltage, V
IN2
= 3.3V, I
OUT2
= 2.5A
1.2V ±2%
Output Voltage V
O3(LDO)
DC Voltage, V
IN2
= 3.3V, I
OUT3
= 1.5A
1.0V ±2%
Maximum Continuous Output Current
Note: I
OUT2
= 4.0A – I
03
4A DC at V
OUT1
, 4A DC at V
OUT2
, 1.5A DC at V
O3
Default Operating Frequency
For 2 Switching Mode Channels
1.25MHz
Efficiency of Channel 1
V
IN1
= 5.5V, V
OUT1
= 1.8V, I
OUT1
= 4A
82.8%, See Figure 3
Efficiency of Channel 2
V
IN2
= 5.5V, V
OUT2
= 1.2V, I
OUT2
= 2.5A
81.7%, See Figure 3
