Datasheet

13
LTC34 06
LTC34 0 6 -1.5/LTC34 0 6 -1.8
3406fa
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
†
2.2µF
CER
V
IN
2.7V
TO 4.2V
LTC3406
RUN
3
2.2µH*
22pF
1M
316k
3406 F07a
5
4
1
2
SW
V
FB
GND
C
OUT
**
10µF
CER
V
OUT
2.5V
*MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
†
TAIYO YUDEN LMK212BJ225MG
Figure 7a
Figure 7b
Figure 7 shows the complete circuit along with its effi-
ciency curve.
OUTPUT CURRENT (mA)
70
EFFICIENCY (%)
80
85
95
100
0.1 10 100 1000
3406 F07b
60
1
90
75
65
V
OUT
= 2.5V
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
TYPICAL APPLICATIO S
U
Single Li-Ion 1.5V/600mA Regulator for
High Efficiency and Small Footprint
V
IN
C
IN
**
4.7µF
CER
V
IN
2.7V
TO 4.2V
LTC3406-1.5
RUN
3
2.2µH*
3406 TA05
5
4
1
2
SW
V
OUT
GND
C
OUT1
†
10µF
CER
V
OUT
1.5V
*
**
†
MURATA LQH32CN2R2M33
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
OUTPUT CURRENT (mA)
70
EFFICIENCY (%)
80
90
95
0.1 10 100 1000
3406 TA06
60
1
85
75
65
V
OUT
= 1.5V
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 0A TO 600mA
3406 TA07
I
L
500mA/DIV
I
LOAD
500mA/DIV
V
OUT
100mV/DIV
AC COUPLED
20µs/DIVV
IN
= 3.6V
V
OUT
= 1.5V
I
LOAD
= 200mA TO 600mA
3406 TA08