LTC3615-1_15 Datasheet, PDF (32/32 Pages) Linear Technology – Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter

LTC3615/LTC3615-1
Typical Application
V_IN
3.3V
47µF
1µF
SV_IN (2×) (2×)
RUN1 ^{PVIN1 PVIN2}
TRACK/SS1
(2×)
SW1
PGOOD1
L1
0.47µH
20pF
R_C
7.5k
C_C
2000pF
R8
R9
226k
174k
ITH1
FB1
LTC3615
R_T /SYNC
SRLIM
(2×) SW2
L2
0.47µH
MODE
FB2
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2 SGND PGND
3615 F15
Figure 15. Single, Low Ripple 6A Output
V_SW1
V_OUT
R1
1.2V/6A
47µF
2V/DIV, ^VSW2
1A/DIV
102k
I_L1
R2
I_L2
102k
I_L1 + I_L2
200ns/DIV
MODE = FCM
3615 F16
Figure 16. Reduced Ripple Current
(Waveform I_L1 + I_L2) and Ripple Voltage
(Not Shown) Through 180° Phase Shift
Between SW1 and SW2
100
V_OUT = 1.2V
90 MODE = FCM
80
70
60
50
40
30
20
10
0
0.01
V_IN = 2.5V
V_IN = 3.3V
V_IN = 5V
0.1
1
OUTPUT CURRENT (A)
10
3615 F17
Figure 17. Efficiency vs Load Current
for V_OUT = 1.2V and I_OUT Up to 6A
Related Parts
PART NUMBER
LTC3633
LTC3546
LTC3417A-2
LTC3612
LTC3614
LTC3616
DESCRIPTION
COMMENTS
15V, Dual 3A, 4MHz, Synchronous Step-Down DC/DC 95% Efficiency, V_IN: 3.60V to 15V, V_OUT(MIN) = 0.6V, I_Q = 500µA, I_SD < 13µA,
Converter
4mm × 5mm QFN-28 and TSSOP-28E Packages
5.5V, Dual 3A/1A, 4MHz, Synchronous Step-Down DC/ 95% Efficiency, V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 160µA, I_SD < 1µA,
DC Converter
4mm × 5mm QFN-28 Package
5.5V, Dual 1.5A/1A, 4MHz, Synchronous Step-Down 95% Efficiency, V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 125µA, I_SD < 1µA,
DC/DC Converter
TSSOP-16E and 3mm × 5mm DFN-16 Packages
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
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
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
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3615}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3615
3615fb
LT 0613 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2010