LTM4606 Datasheet, PDF (15/24 Pages) Linear Technology – Ultralow EMI 28VIN, 6A DC/DC μModule

LTM4606
APPLICATIONS INFORMATION
6
5
4
3
2
1
12V_IN, 3.3V_OUT, 0LFM
12V_IN, 3.3V_OUT, 200LFM
12V_IN, 3.3V_OUT, 400LFM
0
70 75
80
85
90
95
AMBIENT TEMPERATURE (°C)
4606 F12
Figure 12. No Heat Sink
6
5
4
3
2
1
12V_IN, 3.3V_OUT, 0LFM
12V_IN, 3.3V_OUT, 200LFM
12V_IN, 3.3V_OUT, 400LFM
0
70 75
80
85
90
95
AMBIENT TEMPERATURE (°C)
4606 F13
Figure 13. BGA Heat Sink
6
5
4
3
2
1
24V_IN, 3.3V_OUT, 0LFM
24V_IN, 3.3V_OUT, 200LFM
24V_IN, 3.3V_OUT, 400LFM
0
60 65
70
75
80
85
AMBIENT TEMPERATURE (°C)
4606 F14
Figure 14. No Heat Sink
6
5
4
3
2
1
24V_IN, 3.3V_OUT, 0LFM
24V_IN, 3.3V_OUT, 200LFM
24V_IN, 3.3V_OUT, 400LFM
0
60 65 70 75 80
85 90
AMBIENT TEMPERATURE (°C)
4606 G15
Figure 15. BGA Heat Sink
with a rating twice the maximum input current needs to be
provided to protect each unit from catastrophic failure.
Radiated EMI Noise
High radiated EMI noise is a disadvantage for switching
regulators by nature. Fast switching turn-on and turn-off
make large di/dt change in the converters, which act as
the radiation sources in most systems. The LTM4606 in-
tegrates the feature to minimize the radiated EMI noise for
applications with low-noise requirements. Optimized gate
driver for the MOSFET and noise cancellation network are
installed inside the LTM4606 to achieve low radiated EMI
noise. Figure 16 shows a typical example for LTM4606 to
meet the Class B of CISPR 22 radiated emission limit.
100
90
80
70
60
50
40
30
20
10
0
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
4606 F16
Figure 16. Radiated Emission Scan with 12V_IN to 2.5V_OUT at 6A.
CISPR.22 Class B Chase 6141 BiLog, RG-8 1.5 Meters Chase
CPA9231A Horizontal, 3 Meters All Sides, 30MHz to 1000MHz,
RES BW 120kHz, SWP 455ms.
4606f
15