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LT3479EDE-PBF Datasheet(PDF) 11 Page - Linear Technology

Part # LT3479EDE-PBF
Description  3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3479EDE-PBF Datasheet(HTML) 11 Page - Linear Technology

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LT3479
11
3479fb
Increasing switching frequency reduces output voltage
ripple but also reduces efficiency. The user should set
the frequency for the maximum tolerable output voltage
ripple. Figure 8 shows a reduction in efficiency of about
4% between 1MHz and 2MHz operation in a typical
application.
Inrush Current Protection
The LT3479 features a novel inductor current sensing
circuit that protects the LT3479 during hot plugging and
short circuits. An internal resistor in series with the ex-
ternal inductor senses the inductor current at all times.
When it exceeds 5A, a soft-start cycle is initiated. Figure 9
APPLICATIONS INFORMATION
shows an output overload with inrush current protection
disabled. Notice that soft-start remains high, and that
the inductor current does not return to zero. Figure 10
illustrates the benefits of inrush current protection. The
output short initiates a new soft start cycle reducing the
inductor current. After the fault has passed, the inductor
current slowly returns to its equilibrium value. To ensure
bond wire integrity, the inductor current should not exceed
8A for more than 10ms.
Bypassing the 8.5mΩ inductor current sense resistor
disables inrush current protection. Connect the inductor
supply trace and bypass capacitor to the L pin and leave
the VS pin open to disable this feature.
Figure 7. Switching Frequency
RT (kΩ)
0
1.5
1.0
0.5
3.5
3.0
2.5
2.0
3479 F07
0.1
100
10
Figure 8. Efficiency vs Switching Frequency
IOUT (A)
0
70
80
1MHz
0.8
3479 F08
60
50
0.2
0.4
0.6
90
65
75
55
85
2MHz
20μs/DIV
VSW
10V/DIV
IL
4V/DIV
VSS
2V/DIV
VOUT
20V/DIV
3479 F09
Figure 9. Output Overload with
Inrush Current Protection Enabled
20μs/DIV
VSW
10V/DIV
IL
4V/DIV
VSS
2V/DIV
VOUT
20V/DIV
3479 F10
Figure 10. Output Overload with
Inrush Current Protection Disabled
Figure 11. Circuit for Output Overload
LT3479
BOOST
REGULATOR
VIN
0.5Ω
3479 F11
VOUT


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