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参数资料
| 型号： | LTC3549EDCB#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 6/16页 |
| 文件大小： | 352K |
| 代理商： | LTC3549EDCB#TR |
LTC3549
14
3549f
Figure 4b. Burst Mode Efciency, VOUT = 1.5V
Figure 4c. Load Step Response
Design Example
As a design example, assume the LTC3549 is used in a
2-alkaline cell battery-powered application. The VIN will be
operating from a maximum of 3.1V down to about 1.8V.
The load current requirement is a maximum of 250mA
but most of the time it will be in standby mode, requiring
only 2mA. Efciency at both low and high load currents
is important. Output voltage is 1.5V. With this information
we can calculate L using Equation 3:
L
V
fI
V
OUT
L
OUT
IN
=
–
1
(3)
Substituting VOUT = 1.5V, VIN = 3.1V, ΔIL = 100mA and
f = 2.25MHz in Equation 3 gives:
L
MHz
mA
H
=
1
2 25
100
15 1
15
31
33
.
.–
.
For best efciency choose a 350mA or greater inductor
with less than 0.3Ω series resistance. CIN will require an
RMS current rating of at least 0.125A ILOAD(MAX)/2 at
temperature.
For the feedback resistors, choose R2 = 137k. Then, from
Equation 3, R1 is 200k. Figure 4 shows the complete circuit
along with its efciency curve.
APPLICATIO S I FOR ATIO
WU
U
Figure 4a. High Efciency Step-Down Regulator
RUN
CIN
4.7
F
CERAMIC
VIN
1.8V TO
3.1V
LTC3549
VIN
MODE
L1
3.3
H*
CL
22pF
R1
200k
R2
137k
3549 F04a
SW
VFB
GND
COUT
4.7
F
CERAMIC
VOUT
1.5V
*TDK VLF3012AT-3R3MR87
LOAD CURRENT (mA)
30
EFFICIENCY
(%)
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3549 F04b
0
1
VIN = 1.8
VIN = 3.1
VIN = 2.5
20
s/DIV
VOUT
100mV/DIV
AC COUPLED
ILOAD
200mA/DIV
IL
200mA/DIV
3549 F04c
VIN = 2.5V
VOUT = 1.5V
ILOAD = 100mA to 250mA
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