Datasheet

LTC3411A
18
3411afc
For more information www.linear.com/LTC3411A
SV
IN
LTC3411A
PGOOD PGOOD
SW
PV
IN
SYNC/MODE V
FB
I
TH
SHDN/R
T
SGND
L1
2.2µH
V
IN
2.5V TO
5.5V
V
OUT
1.2V/1.5V/1.8V
AT 1.25A
R5
100k
R4
549k
R1A
357k
R3
12.1k
RS1
1M
BM
RS2
1M
3411A TA02a
C3
680pF
C4 22pF
R2 442k
C2
22µF
SGND SGND
R1B
511k
R1C
887k
PS
FC
PGND
C1
10µF
PGND
PGNDSGND
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
C1, C2: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A914BYW-2R2M (D52LC SERIES)
GND
1.8V 1.5V 1.2V
General Purpose Buck Regulator Using Ceramic Capacitors
Efficiency vs Output Current
Typical applicaTions
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.1 1 10 100 1000 10000
3411A TA02b
Burst Mode
OPERATION
V
IN
= 3.6V
V
OUT
= 1.2V
f
O
= 1MHz
FORCED CONTINUOUS
PULSE SKIP
V
IN
= 3.6V
V
OUT
= 1.2V
I
LOAD
= 100mA TO 1.25A
Burst Mode OPERATION
V
OUT
100mV/DIV
AC COUPLED
I
L
1A/DIV
3411A TA02c
40µs/DIV
I
LOAD
1A/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA TO 1.25A
PULSE SKIPPING MODE
V
OUT
100mV/DIV
AC COUPLED
I
L
1A/DIV
3411A TA02d
40µs/DIV
I
LOAD
1A/DIV