LT3467AIS67 Ver la hoja de datos (PDF) - Linear Technology
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LT3467AIS67 Datasheet PDF : 18 Pages
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LT3467/LT3467A
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.
50
40
30
20
10
0
–10
–20
–30
–40
–50
100
GAIN
PHASE
1k
10k
100k
FREQUENCY (Hz)
0
–45
–90
–135
–180
–225
–270
–315
–360
–405
–450
1M
3467 F07
Figure 7. Bode Plot of 3.3V to 5V Application
Table 3. Bode Plot Parameters
PARAMETER VALUE
UNITS
RL
10.4
Ω
COUT
15
μF
RESR
10
mΩ
RO
0.4
MΩ
CC
60
pF
CPL
3.3
pF
RC
100
kΩ
R1
402
kΩ
R2
133
kΩ
VOUT
5
V
VIN
3.3
V
gma
35
μmho
gmp
7.5
mho
L
2.7
μH
fS
1.3*
MHz
*2.1MHz for LT3467A
COMMENT
Application Specific
Application Specific
Application Specific
Not Adjustable
Not Adjustable
Adjustable
Not Adjustable
Adjustable
Adjustable
Application Specific
Application Specific
Not Adjustable
Not Adjustable
Application Specific
Not Adjustable
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.
TYPICAL APPLICATIONS
Lithium-Ion to 6V Step-Up DC/DC Converter
VIN
2.7V TO 4.2V
C1
2.2μF
SHDN
C4
0.047μF
L1
2.2μH
D1
VIN
SW
SHDN
LT3467
SS
FB
GND
R1
501k
R2
133k
C3
1.8pF
VOUT
6V
275mA AT VIN = 2.7V
490mA AT VIN = 3.8V
590mA AT VIN = 4.2V
C2
15μF
C1, C2: X5R OR X7R, 6.3V
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R2
3467 TA02
Li-Ion to 6V
95
90
VIN = 4.2V
85
VIN = 3.8V
80
VIN = 2.7V
75
70
65
60
55
50
50 100 200 300 400 500 600 700
IOUT (mA)
3467 TA02b
3467afe
11
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