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LTC3713 Datasheet(PDF) 18 Page - Linear Technology

Part # LTC3713
Description  Low Input Voltage, High Power, No RSENSE Synchronous Buck DC/DC Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3713 Datasheet(HTML) 18 Page - Linear Technology

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18
LTC3713
3713fa
APPLICATIO S I FOR ATIO
Figure 7. Design Example: 1.25V/6A at 300kHz from 1.8V to 3.3V
CSS
0.1
µF
C2
100pF
RC
20k
RPG
100k
RUN/SS
VON
PGOOD
VRNG
FCB
ITH
SGND1
ION
VFB1
SHDN
SGND2
VFB2
BOOST
TG
SW1
SENSE+
SENSE–
PGND1
BG
INTVCC
VIN1
VIN2
PGND2
SW2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LTC3713
C1
680pF
RR2
39.2k
RR1
10k
RON
237k
RF2
5.6k
PGOOD
RF1
10k
RF3
12.1k
RF4
37.4k
RF5
10k
CF4
1000pF
CIN2
4.7
µF
L2
4.7
µH
M2
IRF7811A
D2
B340A
3713 F07
L1
1
µH
D3
MBR0520
CVCC
10
µF
6V
X5R
CB
0.33
µF
DB
CMDSH-3
COUT
270
µF
×2
M1
IRF7811A
CIN
22
µF
×2
VIN
1.8V TO 3.3V
VOUT
1.25V
6A
+
CIN: TAIYO YUDEN JMK325BJ226MM
CIN2: TAIYO YUDEN JMK212BJ475M6
CVCC: TAIYO YUDEN JMK316BJ106ML
COUT: PANASONIC EEFUEDD271R
L1: TOKO D104C-1
µH
L2: PANASONIC ELJPC4R7MF
P
V
V
A
V
A
pF
kHz
W
TOP =
() ( )
Ω
()
+
()( )( ) ( )(
)
=
125
33
10 2
1 3 0 013
1 7 3 3
10 2
60
300
068
2
2
.
.
..
.
..
.
.
TJ = 50°C + (0.68W)(50°C/W) = 84°C
CIN is chosen for an RMS current rating of about 6A at
temperature. The output capacitors are chosen for a low
ESR of 0.005
Ω to minimize output voltage changes due to
inductor ripple current and load steps. The ripple voltage
will be only:
∆VOUT(RIPPLE) = ∆IL(MAX) (ESR)
= (2.6A) (0.005
Ω) = 13mV
However, a 0A to 6A load step will cause an output change
of up to:
∆VOUT(STEP) = ∆ILOAD (ESR) = (6A) (0.005Ω) = 30mV
The inductor for the boost converter is selected by first
choosing an allowable ripple current. The boost converter
will be operating in discontinous mode. If we select a ripple
current of 170mA for the boost converter, then:
L
V
V
V
mA
MHz
H
=
−


=µ
33
1
33
5
170
1 4
47
.
.
()( .
)
.
The complete circuit is shown in Figure 7.



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