LTC3409
16
3409fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0309 REV C • PRINTED IN THE 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, 600mA/800mA (I
OUT
), 1.5MHz/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
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 APPLICATION
2-Cell to 1.2V/600mA Regulator for High Effi ciency and Low Profi le
V
IN
RUN
MODE
SYNC
SW
V
FB
LTC3409
2.2μH*
3, 4
7
5
8
92
6
1
V
OUT
1.2V
287k
C
IN
4.7μF
CER
V
IN
1.8V TO 3V
301k
C
IN
: TDK C1608X5R0J475M
C
OUT
: TDK C1608X5R0G106M
*SUMIDA CDRH2D09NP-2R2NC
3409 TA02a
22pF
C
OUT
10μF
CER
GND SGND
OUTPUT CURRENT (mA)
0.0001
EFFICIENCY (%)
75
80
85
1
3409 TA02b
70
65
50
0.001
0.01
0.1
60
55
95
90
V
IN
= 1.8V
V
OUT
= 1.2V
f = 1.7MHz
f = 2.6MHz
Effi ciency Load Step
V
OUT
100mV/DIV
AC-COUPLED
V
IN
= 1.8V
V
OUT
= 1.2V
I
LOAD
= 200mA TO 600mA
I
L
500mA/DIV
20μs/DIV
3409 TA02c
I
LOAD
500mA/DIV
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