Datasheet

LTC3615/LTC3615-1
32
3615fb
For more information www.linear.com/LTC3615
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0613 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com/LTC3615
200ns/DIV
3615 F16
V
SW1
2V/DIV,
1A/DIV
V
SW2
I
L1
+ I
L2
I
L2
I
L1
MODE = FCM
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LTC3633 15V, Dual 3A, 4MHz, Synchronous Step-Down DC/DC
Converter
95% Efficiency, V
IN
: 3.60V to 15V, V
OUT(MIN)
= 0.6V, I
Q
= 500µA, I
SD
< 13µA,
4mm × 5mm QFN-28 and TSSOP-28E Packages
LTC3546 5.5V, Dual 3A/1A, 4MHz, Synchronous Step-Down DC/
DC Converter
95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 160µA, I
SD
< 1µA,
4mm × 5mm QFN-28 Package
LTC3417A-2 5.5V, Dual 1.5A/1A, 4MHz, Synchronous Step-Down
DC/DC Converter
95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 125µA, I
SD
< 1µA,
TSSOP-16E and 3mm × 5mm DFN-16 Packages
LTC3612 5.5V, 3A, 4MHz, Synchronous Step-Down DC/DC
Converter
95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 4mm QFN-20 and TSSOP-20E Packages
LTC3614 5.5V, 4A, 4MHz, Synchronous Step-Down DC/DC
Converter
95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 4mm QFN-20 and TSSOP-20E Packages
LTC3616 5.5V, 6A, 4MHz, Synchronous Step-Down DC/DC
Converter
95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 5mm QFN-24 Package
Figure 15. Single, Low Ripple 6A Output
(2×)
SW1
FB1
LTC3615
3615 F15
SGND
PGND
RUN1
TRACK/SS1
ITH1
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2
PGOOD1
R
T
/SYNC
MODE
SRLIM
V
IN
3.3V
SV
IN
(2×)
PV
IN1
(2×)
PV
IN2
47µF 1µF
L1
0.47µH
L2
0.47µH
V
OUT
1.2V/6A
47µF
R1
102k
R2
102k
R
C
7.5k
C
C
2000pF
(2×) SW2
FB2
20pF
R8
226k
R9
174k
Figure 16. Reduced Ripple Current
(Waveform I
L1
+ I
L2
) and Ripple Voltage
(Not Shown) Through 180° Phase Shift
Between SW1 and SW2
Figure 17. Efficiency vs Load Current
for V
OUT
= 1.2V and I
OUT
Up to 6A
OUTPUT CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10
30
20
10
0
90
100
3615 F17
V
OUT
= 1.2V
MODE = FCM
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5V