ltc3406bes5-1.8 Linear Technology Corporation, ltc3406bes5-1.8 Datasheet - Page 13

• Manufacturer Part Number: ltc3406bes5-1.8
• Description: 1.5mhz, 600ma Synchronous Step-down Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

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
TO 4.2V
2.7V
TO 4.2V
R
V
IN
AC COUPLED
2
2.7V
100mV/DIV
500mA/DIV
500mA/DIV
V
=
IN
⎛
⎜
⎝
I
V
LOAD
V
OUT
C
4.7µF
CER
0 6
OUT
Single Li-Ion 1.5V/600mA Regulator for
I
IN
L
.
**
C
4.7µF
CER
High Efficiency and Small Footprint
V
V
I
LOAD
IN
IN
OUT
†
= 3.6V
−
4
1
= 1.5V
= 0mA TO 600mA
** TAIYO YUDEN JHK316BJ106ML
1 1 1000
*MURATA LQH32CN2R2M33
†
V
RUN
⎞
⎟
⎠
4
1
LTC3406B-1.5
TAIYO YUDEN JMK212BJ475MG
U
IN
R
V
RUN
GND
IN
LTC3406B
=
2
GND
Load Step
Figure 7a
V
OUT
20µs/DIV
SW
U
2
SW
V
**
FB
3406B TA05
*
†
3
5
MURATA LQH32CN2R2M33
TAIYO YUDEN CERAMIC JMK212BJ475MG
TAIYO YUDEN CERAMIC JMK316BJ106ML
k
3
5
2.2µH*
316k
U
2.2µH*
3406B F07a
W
22pF
1M
3406B TA07
C
10µF
CER
OUT1
†
U
C
10µF
CER
OUT
V
1.5V
OUT
**
V
2.5V
OUT
Figure 7 shows the complete circuit along with its effi-
ciency curve.
AC COUPLED
100mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
100
OUT
90
80
70
60
50
40
30
20
10
100
90
80
70
60
50
40
30
20
10
I
L
0.1
0.1
V
V
I
LOAD
V
IN
OUT
V
OUT
OUT
= 3.6V
Efficiency vs Output Current
= 1.5V
= 200mA TO 600mA
= 1.5V
V IN = 2.7V
= 2.5V
OUTPUT CURRENT (mA)
1
OUTPUT CURRENT (mA)
1
V IN = 4.2V
V IN = 3.6V
Load Step
Figure 7b
V IN = 2.7V
20µs/DIV
V IN = 3.6V
10
10
V IN = 4.2V
100
100
3406B TA06
3406B F07b
3406B TA08
LTC3406B
1000
1000
13
3406bfa