Datasheet

14
LTC3405A
3405afa
Single Li-Ion to 1.2V/300mA Regulator
Using Ceramic and Tantalum Output Capacitors
V
IN
C
IN
**
2.2µF
CER
V
IN
2.7V
TO 4.2V
LTC3405A
RUN
MODE
3
4.7µH*
22pF
887k
1.774M
3405A TA01a
5
4
6
1
2
SW
V
FB
GND
C
OUT1
***
1µF
CER
C
OUT2
†
22µF
TANT
V
OUT
1.2V
+
*
**
***
†
MURATA LQH3C4R7M34
TAIYO YUDEN CERAMIC LMK212BJ225MG
TAIYO YUDEN CERAMIC JMK107BJ105MA
AVX TAJA226M006R
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
3405A TA01b
1 100
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
200mA/DIV
I
L
200mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.2V
I
LOAD
=
100mA TO 300mA
3405A TA01c
TYPICAL APPLICATIO S
U
Single Li-Ion to 1V/200mA Regulator
Using All Ceramic Capacitors Optimized for Small Footprint
V
IN
C
IN
**
4.7µF
CER
V
IN
2.7V
TO 4.2V
LTC3405A
RUN
MODE
3
3.3µH*
22pF
249k
1M
3405A TA02a
*
**
TAIYO YUDEN LM2016T3R3M
TAIYO YUDEN CERAMIC JMK212BJ475MG
5
4
6
1
2
SW
V
FB
GND
C
OUT
**
4.7µF
CER
V
OUT
1V
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
90
80
70
60
50
40
30
3405A TA02b
1 100
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
100mA/DIV
I
L
100mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1V
I
LOAD
=
100mA TO 200mA
3405A TA02c