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LTC3406AB-2 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3406AB-2
Description  2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3406AB-2 Datasheet(HTML) 13 Page - Linear Technology

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LTC3406AB-2
13
3406ab2f
APPLICATIONS INFORMATION
For the feedback resistors, choose R1 = 309k. R2 can
then be calculated from Equation (2) to be:
R
V
Rk
OUT
2
06
11 978
=−
⎛
⎝⎜
⎞
⎠⎟
=
.
Use a 976k 1% resistor.
Figure 5 shows the complete circuit along with its ef-
ficiency curve.
Figure 5a
Figure 5b. Efficiency vs Load Current
VIN
CIN
†
4.7
µF
CER
VIN
LTC3406AB-2
RUN
2.2
µH*
22pF
976k
309k
3406AB2 F05a
SW
VFB
GND
COUT**
10
µF
CER
VOUT
2.5V
600mA
* MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
† TAIYO YUDEN JMK212BJ475MG
OUTPUT CURRENT (mA)
30
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3406AB2 F05b
0
1
VOUT = 2.5V
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
Load Step
Load Step
Load Step
Load Step
VOUT
200mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
20
µs/DIV
VIN = 3.6V
VOUT = 2.5V
ILOAD = 0mA TO 600mA
3406AB2 TA02
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
20
µs/DIV
VIN = 3.6V
VOUT = 2.5V
ILOAD = 50mA TO 600mA
3406AB2 TA03
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
20
µs/DIV
VIN = 3.6V
VOUT = 2.5V
ILOAD = 100mA TO 600mA
3406AB2 TA04
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
20
µs/DIV
VIN = 3.6V
VOUT = 2.5V
ILOAD = 200mA TO 600mA
3406AB2 TA05



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