LTC3619
22
3619fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2009
LT 1012 REV A • PRINTED IN USA
relaTeD parTs
Typical applicaTion
Dual 400mA/800mA Buck Converter, I
LIM
= 500mA
Dual 400mA/800mA Buck Converter, I
LIM
= 475mA or Disabled
PART NUMBER DESCRIPTION COMMENTS
LTC3127 1.2A I
OUT
, 1.6MHz, Synchronous Buck-Boost DC/DC
Converter with Adjustable Input Current Limit
94% Efficiency, V
IN(MIN)
= 1.8V, V
IN(MAX)
= 5.5V, V
OUT(MAX)
= 5.25V,
I
Q
= 18µA, I
SD
< 1µA, 3mm × 3mm DFN-MSOP10E
LTC3125 1.2A I
OUT
, 1.6MHz, Synchronous Boost DC/DC
Converter with Adjustable Input Current Limit
94% Efficiency, V
IN(MIN)
= 1.8V, V
IN(MAX)
= 5.5V, V
OUT(MAX)
= 5.25V,
I
Q
= 15µA, I
SD
< 1µA, 2mm × 3mm DFN-8
LTC3417A/
LTC3417A-2
Dual 1.5A/1A, 4MHz, Synchronous Step-Down DC/
DC Converter
95% Efficiency, V
IN(MIN)
= 2.3V, V
IN(MAX)
= 5.5V, V
OUT(MIN)
= 0.8V,
I
Q
= 125µA, I
SD
= <1µA, TSSOP-16E, 3mm × 5mm DFN-16
LTC3407A/
LTC3407A-2
Dual 600mA/600mA, 1.5MHz, Synchronous
Step-Down DC/DC Converter
95% Efficiency, V
IN(MIN)
= 2.5V, V
IN(MAX)
= 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 40µA, I
SD
= <1µA, MS10E, 3mm × 3mm DFN-10
LTC3548/LTC3548-1/
LTC3548-2
Dual 400mA and 800mA I
OUT
, 2.25MHz,
Synchronous Step-Down DC/DC Converter
95% Efficiency, V
IN(MIN)
= 2.5V, V
IN(MAX)
= 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 40µA, I
SD
= <1µA, MS10E, 3mm × 3mm DFN-10
LTC3546 Dual 3A/1A, 4MHz, Synchronous Step-Down
DC/DC Converter
95% Efficiency, V
IN(MIN)
= 2.3V, V
IN(MAX)
= 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 160µA, I
SD
= <1µA, 4mm × 5mm QFN-28
LTC3442 1.2A, I
OUT
, 2MHz, Synchronous Buck-Boost
DC/DC Converter with Input Current Limit
95% Efficiency, V
IN(MIN)
= 2.4V, V
IN(MAX)
= 5.5V, V
OUT(MAX)
= 2.4V to
5.25V, I
Q
= 50µA, I
SD
= <1µA, 3mm × 4mm DFN-12
V
IN
RUN2 RUN1
LTC3619
V
FB2
SW2
SW1
PGOOD1PGOOD2
V
FB1
C
F1
, 22pF
GNDRLIM
V
IN
3.3V TO 5.5V
V
OUT2
3.3V AT
800mA
V
OUT1
1.8V AT
400mA
3619 TA02
R4
1150k
R2
511k
R3
255k
R1
255k
L2
1.5µH
L1
3.3µH
C
OUT2
2.2mF
×2
SuperCap
C
OUT1
10µF
C1
10µF
R
LIM
110k
C
LIM
1000pF
C1, C
OUT1
: AVX 08056D106KAT2A
C
OUT2
: VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-332ML
L2: COILCRAFT LPS4012-152ML
V
IN
RUN2 RUN1
LTC3619
V
FB2
SW2
SW1
PGOOD1PGOOD2
V
FB1
C
F1
, 22pF
GND
R
LIM
V
IN
3.3V TO 5.5V
V
OUT2
3.3V AT
800mA
V
OUT1
1.8V AT
400mA
3619 TA03
R4
1150k
R2
511k
R3
255k
R1
255k
L2
1.5µH
L1
3.3µH
C
OUT2
2.2mF
×2
SuperCap
I
LIM
DISABLE
C
OUT1
10µF
C1
10µF
R
LIM
116k
C
LIM
2200pF
C1, C
OUT1
: AVX 08056D106KAT2A
C
OUT2
: VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-332ML
L2: COILCRAFT LPS4012-152ML
