Datasheet

13
LTC34 06B
3406bfa
APPLICATIO S I FOR ATIO
WUUU
For the feedback resistors, choose R1 = 316k. R2 can
then be calculated from equation (2) to be:
R
V
Rk
OUT
2
06
1 1 1000= −
⎛
⎝
⎜
⎞
⎠
⎟
=
.
V
IN
C
IN
†
4.7µF
CER
V
IN
2.7V
TO 4.2V
LTC3406B
RUN
3
2.2µH*
22pF
1M
316k
3406B F07a
5
4
1
2
SW
V
FB
GND
C
OUT
**
10µF
CER
V
OUT
2.5V
*MURATA LQH32CN2R2M33
** TAIYO YUDEN JHK316BJ106ML
†
TAIYO YUDEN JMK212BJ475MG
Figure 7a
Figure 7b
Figure 7 shows the complete circuit along with its effi-
ciency curve.
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B F07b
1 100
V
OUT
= 2.5V
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
TYPICAL APPLICATIO S
U
V
IN
C
IN
**
4.7µF
CER
V
IN
2.7V
TO 4.2V
LTC3406B-1.5
RUN
3
2.2µH*
3406B TA05
5
4
1
2
SW
V
OUT
GND
C
OUT1
†
10µF
CER
V
OUT
1.5V
*
**
†
MURATA LQH32CN2R2M33
TAIYO YUDEN CERAMIC JMK212BJ475MG
TAIYO YUDEN CERAMIC JMK316BJ106ML
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
10
1000
100
90
80
70
60
50
40
30
20
10
3406B TA06
1 100
V
OUT
= 1.5V
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 200mA TO 600mA
3406B TA08
Efficiency vs Output Current
Load Step
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 0mA TO 600mA
3406B TA07
Load Step
Single Li-Ion 1.5V/600mA Regulator for
High Efficiency and Small Footprint