Datasheet

14
LTC3405
3405fa
TYPICAL APPLICATIO S
U
V
IN
C
IN
**
2.2µF
CER
V
IN
2.7V
TO 4.2V
LTC3405
RUN
MODE
3
4.7µH*
22pF
887k
698k
3405 TA02a
5
4
6
1
2
SW
V
FB
GND
C
OUT1
***
1µF
CER
C
OUT2
†
22µF
TANT
V
OUT
1.8V
+
*
**
***
†
MURATA LQH3C4R7M34
TAIYO YUDEN CERAMIC LMK212BJ225MG
TAIYO YUDEN CERAMIC JMK107BJ105MA
AVX TAJA226M006R
Single Li-Ion to 1.8V/300mA Regulator
Using Ceramic and Tantalum Output Capacitors
V
IN
C
IN
**
1µF
CER
*
**
†
TAIYO YUDEN LB2016T3R3M
TAIYO YUDEN CERAMIC JMK107BJ105MA
TAIYO YUDEN CERAMIC JMK212BJ475MG
V
IN
2.7V
TO 4.2V
LTC3405
RUN
MODE
3
3.3µH*
22pF
200k
1M
3405 TA03a
5
4
6
1
2
SW
V
FB
GND
C
OUT
†
4.7µF
CER
V
OUT
1.8V
332k
Single Li-Ion to 1.8V/200mA Regulator
Using All Ceramic Capacitors Optimized for Smallest Footprint
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
3405 TA02b
1 100
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
3405 TA03b
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
3405 TA03c
40µs/DIV
V
IN
= 3.6V
I
LOAD
=
100mA TO 250mA
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
200mA/DIV
I
L
200mA/DIV
40µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
100mA TO 250mA
3405 TA02c