LTC3406B Linear Technology, LTC3406B Datasheet - Page 13

• Manufacturer Part Number: LTC3406B
• Description: Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
For the feedback resistors, choose R1 = 316k. R2 can
then be calculated from equation (2) to be:
TYPICAL APPLICATIO S
R
95
90
85
80
75
70
65
60
2
0.1
TO 4.2V
V
2.7V
V
OUT
V
IN
IN
= 2.7V
= 1.5V
V
0 6
OUT
.
1
OUTPUT CURRENT (mA)
V
IN
V
C
2.2 F
CER
IN
= 3.6V
IN
= 4.2V
†
1 1 1000
** TAIYO YUDEN JMK316BJ106ML
U
10
*MURATA LQH32CN2R2M33
R
†
4
1
TAIYO YUDEN LMK212BJ225MG
V
RUN
IN
Figure 7a
LTC3406
U
GND
100
2
SW
V
FB
k
3406 TA06
3
5
U
1000
W
TO 4.2V
316k
2.2 H*
3406 F07a
22pF
2.7V
AC COUPLED
1M
V
100mV/DIV
500mA/DIV
500mA/DIV
IN
Single Li-Ion 1.5V/600mA Regulator for
I
V
LOAD
High Efficiency and Small Footprint
OUT
I
L
C
4.7 F
CER
U
IN
V
V
I
**
LOAD
IN
OUT
C
10 F
CER
= 3.6V
OUT
= 1.5V
= 0A TO 600mA
4
1
**
V
2.5V
V
RUN
OUT
LTC3406-1.5
IN
GND
2
20 s/DIV
V
OUT
SW
Figure 7 shows the complete circuit along with its effi-
ciency curve.
**
*
3406 TA05
†
3
5
MURATA LQH32CN2R2M33
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
2.2 H*
100
95
90
85
80
75
70
65
60
3406 TA07
0.1
LTC3406-1.5/LTC3406-1.8
V
V
IN
OUT
= 2.7V
C
10 F
CER
= 2.5V
OUT1
AC COUPLED
V
100mV/DIV
500mA/DIV
500mA/DIV
IN
1
OUTPUT CURRENT (mA)
†
= 4.2V
I
V
1.5V
V
LOAD
OUT
OUT
V
Figure 7b
IN
I
L
= 3.6V
10
V
V
I
LOAD
IN
OUT
= 3.6V
= 1.5V
= 200mA TO 600mA
100
3406 F07b
20 s/DIV
1000
LTC3406
sn3406 3406fs
13
3406 TA08