Datasheet

LTC3565
18
3565fc
For more information www.linear.com/LTC3565
SV
IN
LTC3565
PGOOD PGOOD
SW
PV
IN
SYNC/MODE V
FB
ITH SHDN/RT
L1
2.2µH
V
IN
2.5V TO
5.5V
V
OUT
1.8V/1.5V/1.2V
AT 1.25A
R5
100k
R4
191k
R1A
147k
R3
12.1k
RS1
1M
BM
RS2
1M
3565 TA02a
C3
680pF
C4 22pF
R2 294k
C2
22µF
R1B
196k
R1C
294k
PS
FC
C1
22µF
GND
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
C1, C2: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A914BYW-2R2M (D52LC SERIES)
1.8V 1.5V 1.2V
General Purpose Buck Regulator Using Ceramic Capacitors
Efficiency vs Output Current
TYPICAL APPLICATION
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.1 1 10 100 1000 10000
3565 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
3565 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
3565 TA02d
40µs/DIV
I
LOAD
1A/DIV