LTC3618 Datasheet, PDF (24/24 Pages) Linear Integrated Systems – Dual 4MHz, 3A Synchronous Buck Converter for DDR Termination

LTC3618
TYPICAL APPLICATION
V_IN
2.5V~5V
R_C2
6.49k
C_C2
1000pF
PGOOD
10pF
External Compensation, 500kHz Sync 180° Phasing
47μF
47μF
1μF
R_C1
10k
C_C1
1000pF
10pF
R_T
750k
V_REF
0.01μF
500kHz
100k
SV_IN (2×) PV_IN1 (2×) PV_IN2
RUN1
VDDQIN
TRACK/SS1
PGOOD1
ITH1
LTC3618
(2×) SW1
FB1
RT
VTTR
MODE/SYNC
PHASE
RUN2
(2×) SW2
FB2
2.2μH
2.2μH
PGOOD2
ITH2 _SGND
PGND
3618 TA03a
10pF ^R1
845k
R2
562k
V_DDQ
1.5V/±3A
47μF
V_TT
0.75V/±3A
47μF
×2
Efficiency vs Output Current of V_DDQ
100
2.0
V_IN = 2.5V
90
V_IN = 3.3V
1.8
80
V_IN = 5V
1.6
70
1.4
60
1.2
50
1.0
40
0.8
30
0.6
20
0.4
10
0.2
0
0.001
0.01
0.1
1
LOAD CURRENT (mA)
0
10
3618 TA03b
Efficiency vs Output Current of V_TT
100
2.0
V_IN = 2.5V
90
V_IN = 3.3V
1.8
80
V_IN = 5V
1.6
70
1.4
60
1.2
50
1.0
40
0.8
30
0.6
20
0.4
10
0.2
0
0.001
0.01
0.1
1
LOAD CURRENT (mA)
0
10
3618 TA03c
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LTC3546
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
LTC3417A-2 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
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
LTC3617
±6A Monolithic Synchronous Buck for DDR
Termination
Over 90% Efficiency, V_IN: 2.25V to 5.5V, 5k V_OUT(MIN) = 0.5V, 3mm × 5mm
QFN-24 Package
3618fb
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 1211 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011