LTC3406-1.5_15 Datasheet, PDF (13/16 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

LTC3406
LTC3406-1.5/LTC3406-1.8
APPLICATIO S I FOR ATIO
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
V_IN
2.7V
TO 4.2V
C_IN^†
2.2µF
CER
4
V_IN
3
SW
LTC3406
1
RUN
5
V_FB
GND
2
2.2µH*
22pF
1M
316k
3406 F07a
*MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
† _{TAIYO YUDEN LMK212BJ225MG}
Figure 7a
V_OUT
2.5V
C_OUT**
10µF
CER
Figure 7 shows the complete circuit along with its effi-
ciency curve.
100
V_OUT = 2.5V
95
V_IN = 2.7V
90
V_IN = 3.6V
85
V_IN = 4.2V
80
75
70
65
60
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3406 F07b
Figure 7b
TYPICAL APPLICATIO S
Single Li-Ion 1.5V/600mA Regulator for
High Efficiency and Small Footprint
V_IN
2.7V
TO 4.2V
C_IN**
4.7µF
CER
4
V_IN
3
SW
LTC3406-1.5
1
RUN
5
V_OUT
2.2µH*
C_OUT1†
10µF
CER
V_OUT
1.5V
GND
3406 TA05
2
*MURATA LQH32CN2R2M33
**TAIYO YUDEN JMK212BJ475MG
†_{TAIYO YUDEN JMK316BJ106ML}
95
V_OUT = 1.5V
90
V_IN = 2.7V
85
V_IN = 4.2V
80
V_IN = 3.6V
75
70
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
65
60
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3406 TA06
V_IN = 3.6V
20µs/DIV
V_OUT = 1.5V
I_LOAD = 0A TO 600mA
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3406 TA07
V_IN = 3.6V
20µs/DIV
V_OUT = 1.5V
I_LOAD = 200mA TO 600mA
3406 TA08
3406fa
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