Datasheet

LTC3406A
13
3406afa
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3406A F05b
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
APPLICATIONS INFORMATION
For the feedback resistors, choose R1 = 316k. R2 can
then be calculated from Equation (2) to be:
R2 =
V
OUT
0.6
1






R1= 1000k
(4)
Figure 5 shows the complete circuit along with its ef-
fi ciency curve.
V
IN
C
IN
†
4.7μF
CER
V
IN
2.7V TO 4.2V
LTC3406A
RUN
3
2.2μH*
22pF
1M
316k
3406A F05a
5
4
1
2
SW
V
FB
GND
C
OUT
**
10μF
CER
V
OUT
2.5V
600mA
* MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
†
TAIYO YUDEN LMK212BJ475MG
V
OUT
100mV/DIV
V
IN
= 3.6V
V
OUT
= 2.5V
I
LOAD
= 300mA TO 600mA
20μs/DIV
3406A F05d
I
LOAD
500mA/DIV
I
L
500mA/DIV
Figure 5.