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.
Table 3. Bode Plot Parameters
PARAMETER
VALUE
10.4
15
UNITS
Ω
COMMENT
R
L
Application Specific
Application Specific
Application Specific
Not Adjustable
Not Adjustable
Adjustable
C
μF
OUT
50
40
0
R
10
mΩ
MΩ
pF
ESR
–45
R
0.4
60
30
–90
O
C
C
20
–135
–180
–225
–270
–315
–360
–405
–450
10
C
3.3
100
402
133
5
pF
PL
0
R
kΩ
kΩ
kΩ
V
Not Adjustable
Adjustable
C
–10
–20
–30
–40
–50
R1
R2
Adjustable
V
Application Specific
Application Specific
Not Adjustable
Not Adjustable
Application Specific
Not Adjustable
OUT
GAIN
PHASE
V
3.3
35
V
IN
100
1k
10k
100k
1M
g
g
μmho
mho
μH
ma
FREQUENCY (Hz)
7.5
2.7
1.3*
mp
3467 F07
L
Figure 7. Bode Plot of 3.3V to 5V Application
f
MHz
S
*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.
TYPICAL APPLICATIONS
Lithium-Ion to 6V Step-Up DC/DC Converter
Li-Ion to 6V
95
L1
D1
2.2μH
V
V
IN
90
85
80
75
70
65
60
55
50
V
= 4.2V
OUT
6V
IN
2.7V TO 4.2V
R1
275mA AT V = 2.7V
V
= 3.8V
IN
IN
501k
V
SW
490mA AT V = 3.8V
IN
IN
V
= 2.7V
IN
590mA AT V = 4.2V
IN
C1
C3
1.8pF
SHDN
SHDN
LT3467
2.2μF
SS
FB
C2
15μF
C4
0.047μF
R2
133k
GND
C1, C2: X5R OR X7R, 6.3V
3467 TA02
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R2
50 100
300 400 500 600 700
(mA)
200
I
OUT
3467 TA02b
3467afe
11
Linear Systems [ Linear Systems ]
