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| LTC3406AB-2_15 Datasheet, PDF (13/16 Pages) Linear Technology – 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT | |||
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LTC3406AB-2
APPLICATIONS INFORMATION
For the feedback resistors, choose R1 = 309k. R2 can
then be calculated from Equation (2) to be:
R2 =
â
ââ
VOUT
0.6
â 1ââ â
R1=
978k
Use a 976k 1% resistor.
2.2µH*
VIN
CINâ
VIN
SW
4.7µF
CER
LTC3406AB-2
22pF
VOUT
2.5V
600mA
COUT**
10µF
CER
RUN VFB
GND
976k
309k
* MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
3406AB2 F05a â TAIYO YUDEN JMK212BJ475MG
Figure 5a
Figure 5 shows the complete circuit along with its ef-
ï¬ciency curve.
100
VOUT = 2.5V
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3406AB2 F05b
Figure 5b. Efï¬ciency vs Load Current
Load Step
Load Step
VOUT
200mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 2.5V
ILOAD = 0mA TO 600mA
3406AB2 TA02
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 2.5V
ILOAD = 50mA TO 600mA
3406AB2 TA03
Load Step
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 2.5V
ILOAD = 100mA TO 600mA
3406AB2 TA04
Load Step
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 2.5V
ILOAD = 200mA TO 600mA
3406AB2 TA05
3406ab2f
13
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