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参数资料
| 型号： | LT3467AIS67#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 3/18页 |
| 文件大小： | 266K |
| 代理商： | LT3467AIS67#TRM |
LT3467/LT3467A
11
3467afe
APPLICATIONS INFORMATION
Using the circuit of Figure 2 as an example, the following
table shows the parameters used to generate the Bode
plot shown in Figure 7.
Table 3. Bode Plot Parameters
PARAMETER
VALUE
UNITS
COMMENT
RL
10.4
Ω
Application Specic
COUT
15
μF
Application Specic
RESR
10
mΩ
Application Specic
RO
0.4
MΩ
Not Adjustable
CC
60
pF
Not Adjustable
CPL
3.3
pF
Adjustable
RC
100
kΩ
Not Adjustable
R1
402
kΩ
Adjustable
R2
133
kΩ
Adjustable
VOUT
5
V
Application Specic
VIN
3.3
V
Application Specic
gma
35
μmho
Not Adjustable
gmp
7.5
mho
Not Adjustable
L
2.7
μH
Application Specic
fS
1.3*
MHz
Not Adjustable
*2.1MHz for LT3467A
From Figure 7, the phase is –138° when the gain reaches
0dB giving a phase margin of 42°. This is more than
adequate. The crossover frequency is 37kHz.
FREQUENCY (Hz)
GAIN
(dB)
PHASE
(DEG)
50
40
30
20
10
0
–10
–20
–30
–40
–50
0
–45
–90
–135
–180
–225
–270
–315
–360
–405
–450
100
10k
100k
1M
3467 F07
1k
GAIN
PHASE
Figure 7. Bode Plot of 3.3V to 5V Application
TYPICAL APPLICATIONS
Lithium-Ion to 6V Step-Up DC/DC Converter
GND
VIN
SW
SHDN
FB
VIN
2.7V TO 4.2V
D1
L1
2.2μH
R1
501k
LT3467
3467 TA02
C2
15μF
C3
1.8pF
C1
2.2μF
R2
133k
VOUT
6V
275mA AT VIN = 2.7V
490mA AT VIN = 3.8V
590mA AT VIN = 4.2V
C1, C2: X5R OR X7R, 6.3V
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R2
SHDN
SS
C4
0.047μF
IOUT (mA)
EFFICIENCY
(%)
200
95
90
85
80
75
70
65
60
55
50
3467 TA02b
100
50
300
400
500
600
700
VIN = 3.8V
VIN = 4.2V
VIN = 2.7V
Li-Ion to 6V
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