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LTC3704 Datasheet(PDF) 22 Page - Linear Technology

Part # LTC3704
Description  Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3704 Datasheet(HTML) 22 Page - Linear Technology

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22
LTC3704
sn3704 3704fs
∆V
k
k
mV
OP P
()
–.
•
.
.
–.
–
••
.
−
=
 =
10 5
300
50
35
0 0016
1
8 300
100
13 7
µ
µ
This ripple voltage calculation also assumes no coupling
between the inductors, making the 13.7mV number very
conservative.
Figure 15 illustrates the same basic application shown in
Figure 1, with the added features of soft-start and
undervoltage lockout on the input supply. Figures 16
through 21 illustrate the measured performance for this
converter. The peak efficiency is 87% at a load current of
2A and the peak-to-peak output ripple is less than 10mV.
Figures 19 and 20 illustrate the load step response at 5V
and 15V input, and Figure 21, the start-up characteristics
with a resistive load.
APPLICATIO S I FOR ATIO
The capacitor used was a TDK 47
µF, 16V X5R-dielectric
ceramic (C5750X5R1C476M), mainly because of its low
ESR (2.4m
Ω) and high RMS current capability.
8. The peak-to-peak output ripple is:
∆V
D
f
V
L
ESR
fC
OP P
MAX
O
O
()
–
•
––
••
−
=
1
2
1
8
As a first try, a TDK 100
µF, 6.3V X5R-dielectric ceramic
capacitor was chosen (C5750X5R0J107M). This capaci-
tor has a very low 1.6m
Ω of ESR. As a result, the peak-to-
peak output ripple voltage is:
Figure 18. Output Ripple Voltage and
Inductor Current for the Circuit in Figure 15
Figure 21. Soft-Start for the Circuit in Figure 15
Figure 20. Load Step Response at VIN = 15V
for the Circuit in Figure 15
Figure 19. Load Step Response at VIN = 5V
for the Circuit in Figure 15
VIN = 5V
IOUT = –2V
VOUT (AC)
10mV/DIV
IL2 (DC)
1A/DIV
1
µs/DIV
3704 F18
VIN = 5V
VOUT (AC)
100mV/DIV
IOUT (DC)
1A/DIV
250
µs/DIV
3704 F19
2A
0.5A
VIN = 15V
VOUT (AC)
100mV/DIV
IOUT (DC)
1A/DIV
250
µs/DIV
3704 F20
2A
0.5A
VIN = 5V
VOUT
1V/DIV
IOUT
1A/DIV
1ms/DIV
3704 F21
VOUT
IOUT



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