Datasheet

LTC3549
16
3549f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0706 • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LTC1878 600mA (I
OUT
), 550kHz, Synchronous
Step-Down DC/DC Converter
96% Effi ciency, V
IN
: 2.7V to 6V, V
OUT(MIN)
= 0.8V, I
Q
= 10µA, I
SD
< 1µA,
MS8 Package
LTC1879 1.20A (I
OUT
), 550kHz, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.7V to 10V, V
OUT(MIN)
= 0.8V, I
Q
= 15µA, I
SD
< 1µA,
16-Lead TSSOP
LT3020 100mA, Low Voltage VLDO
™
V
IN
: 0.9V to 10V, V
OUT(MIN)
= 0.20V, Dropout Voltage = 0.15V, I
Q
= 120µA,
I
SD
< 3µA, V
OUT
= ADJ, DFN/MS8 Packages
LTC3025 100mA, Low Voltage VLDO V
IN
: 0.9V to 5.5V, V
OUT(MIN)
= 0.40V, Dropout Voltage = 0.05V, I
Q
= 54µA,
I
SD
< 1µA, V
OUT
= ADJ, DFN Package
LTC3404 600mA (I
OUT
), 1.4MHz, Synchronous
Step-Down DC/DC Converter
96% Effi ciency, V
IN
: 2.7V to 6V, V
OUT(MIN)
= 0.8V, I
Q
= 10µA, I
SD
< 1µA,
MS8 Package
LTC3405/LTC3405A 300mA (I
OUT
), 1.5MHz, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 20µA, I
SD
< 1µA,
ThinSOT
™
Package
LTC3406/LTC3406B 600mA (I
OUT
), 1.5MHz, Synchronous
Step-Down DC/DC Converter
96% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 20µA, I
SD
< 1µA,
ThinSOT Package
LTC3407/LTC3407-2 Dual, 800mA (I
OUT
), 2.25MHz, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40µA, I
SD
< 1µA,
10-Lead MSE Package
LTC3409 600mA, 2.6MHz Low V
IN
, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 1.6V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 65µA, I
SD
< 1µA,
DFN Package
LTC3410/LTC3410B 300mA, 2.25MHz, Synchronous Step-Down
DC/DC Converter
96% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 26µA/200µA, I
SD
< 1µA,
SC70 Package
LTC3411 1.25A (I
OUT
), 4MHz, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 60µA, I
SD
< 1µA,
10-Lead MS Package
VLDO and ThinSOT are trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
U
RELATED PARTS
Effi ciency vs Load Current
RUN
C
IN
4.7µF
CERAMIC
V
IN
2.5V TO
4.2V
LTC3549
V
IN
MODE
L1, 4.7µH*
CL, 22pF
R1, 267k
R2
137k
3549 TA03a
SW
V
FB
GND
C
OUT
4.7µF
CERAMIC
V
OUT
1.8V
*TDK VLF3012AT-4R7MR74
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 TA03b
0
1
V
IN
= 2.5V
V
OUT
= 1.8V
V
IN
= 4.2V
V
IN
= 3.6V
20µs/DIV
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
200mA/DIV
I
L
200mA/DIV
3549 TA03c
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA to 250mA
Load Step Response