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LTC3672B-1
12
3672B1f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
?/DIV>
 FAX: (408) 434-0507
?
www.linear.com
?LINEAR TECHNOLOGY CORPORATION 2007
LT 0607 " PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER    DESCRIPTION
COMMENTS
LTC3405/LTC3405A  300mA I
OUT
, 1.5MHz, Synchronous Step-Down DC/DC
Converter
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.8V, I
Q
 = 20糀,
I
SD
 <1糀, ThinSOT Package
LTC3406/LTC3406B  600mA I
OUT
, 1.5MHz, Synchronous Step-Down DC/DC
Converter
96% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.6V, I
Q
 = 20糀,
I
SD
 <1糀, ThinSOT Package
LTC3407/LTC3407-2  Dual 600mA/800mA I
OUT
, 1.5MHz/2.25MHz, Synchronous
Step-Down DC/DC Converter
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.6V, I
Q
 = 40糀,
I
SD
 <1糀, MS10E Package
LTC3410/LTC3410B  300mA I
OUT
, 2.25MHz, Synchronous Step-Down DC/DC
Converter
96% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.8V, I
Q
 = 26糀,
I
SD
 <1糀, SC70 Package
LTC3411
1.25A I
OUT
, 4MHz, Synchronous Step-Down DC/DC
Converter
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.8V, I
Q
 = 60糀,
I
SD
 <1糀, MS10 Package
LTC3445
I
2
C Controllable 600mA Synchronous Buck Regulator with
Two 50mA LDOs in a 4mm ?4mm QFN
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.85V, I
Q
 = 360糀,
I
SD
 <27糀, 4mm ?4mm QFN Package
LTC3446
Synchronous 1A, 2.25MHz Step-Down DC/DC Regulator
with Dual VLDOs
95% Ef ciency, V
IN
: 2.7V to 5.5V, V
OUT(MIN)
 = 0.4V, I
Q
 = 140糀,
I
SD
 <1糀, 3mm ?4mm DFN Package
LTC3448
600A I
OUT
, 1.5MHz/2.25MHz, Synchronous
Step-Down DC/DC Converter with LDO Mode
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.6V, I
Q
 = 32糀,
I
SD
 <1糀, MS10, DFN Packages
LTC3541/LTC3541-1/
LTC3541-2/LTC3541-3
Synchronous 500mA, 2.25MHz Step-Down DC/DC
Regulator with a 300mA VLDO in a 3mm ?3mm DFN
95% Ef ciency, V
IN
: 2.7V to 5.5V, V
OUT(MIN)
 = 0.4V, I
Q
 = 85糀,
I
SD
 <1糀, 3mm ?3mm DFN Package
LTC3547
Dual 300mA I
OUT
, 2.25MHz, Synchronous Step-Down
DC/DC Converter
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.6V, I
Q
 = 40糀,
I
SD
 <1糀, DFN-8 Package
LTC3548/LTC3548-1/
LTC3548-2
Dual 800mA/400mA I
OUT
, 2.25MHz, Synchronous Step-
Down DC/DC Converter
95% Ef ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
 = 0.6V, I
Q
 = 40糀,
I
SD
 <1糀, MS10, DFN Packages
LTC3672B-1 with V
IN1
 Tied to V
IN
, V
OUT1
 Capable of 400mA Even
with V
OUT2
 and V
OUT3
 Fully Loaded
LTC3672B-1 with V
IN1
 Tied to Buckout with More LDO Output Capacitance for Improved Transient Response
LTC3672B-1
GND
ENALL
SW
V
OUT1
1.8V
400mA
V
OUT2
1.2V
150mA
2.2F
4.7H
ENABLE
INPUT
BUCKOUT
V
IN
V
IN1
LDO1
LDO2
3672b1 TA02
1F
1F
10F
V
OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
V
IN
2.9V TO 5.5V
LTC3672B-1
GND
ENALL
SW
V
OUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
V
OUT2
1.2V
150mA
10F
4.7H
ENABLE
INPUT
V
OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
BUCKOUT
V
IN1
V
IN
LDO1
LDO2
3672b1 TA04
4.7F
4.7F
10F
V
IN
2.9V TO 5.5V
LTC3672B-1 with V
IN1
 Tied to an Independent Supply, V
OUT1
 
Capable of 400mA Even with V
OUT2
 and V
OUT3
 Fully Loaded
LTC3672B-1
GND
ENALL
V
IN1
SW
V
OUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
V
OUT2
1.2V
150mA
V
IN1
1.8V TO V
IN
2.2F
4.7H
ENABLE
INPUT
BUCKOUT
V
IN
LDO1
LDO2
3672b1 TA03
1F
1F
1F
10F
V
OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
V
IN
2.9V TO 5.5V
20約/DIV
V
IN
 = 3.6V
SIMULTANEOUS LOAD TRANSIENT ON BOTH LDOs
V
OUT1
 FLOATING
3672b1 TA04b
V
OUT2
V
OUT3
V
OUT1
100mA
10mA
V
OUT2
 AND V
OUT3
LOAD CURRENT
50mV/DIV
AC-COUPLED
Load Transient Response
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