lt3467aes67 Linear Technology Corporation, lt3467aes67 Datasheet - Page 11

• Manufacturer Part Number: lt3467aes67
• Description: 1.1a Step-up Dc/dc Converter With Integrated Soft-start
• Manufacturer: Linear Technology Corporation

APPLICATIONS
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.
TYPICAL APPLICATIO S
TO 4.2V
2.7V
2.2μF
V
IN
C1
Figure 7.Bode Plot of 3.3V to 5V Application
–10
–20
–30
–40
–50
C1, C2: X5R OR X7R, 6.3V
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R2
50
40
30
20
10
Lithium-Ion to 6V Step-Up DC/DC Converter
0.047μF
0
100
SHDN
C4
GAIN
PHASE
U
1k
SS
SHDN
V
FREQUENCY (Hz)
IN
INFORMATION
LT3467
2.2μH
U
GND
10k
L1
SW
FB
U
100k
D1
W
501k
R1
3467 F07
R2
133k
1M
0
–45
–90
–135
–180
–225
–270
–315
–360
–405
–450
C3
1.8pF
U
3467 TA02
C2
15μF
V
6V
275mA AT V
490mA AT V
590mA AT V
OUT
Table 3. Bode Plot Parameters
*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.
IN
IN
IN
= 2.7V
= 3.8V
= 4.2V
Parameter
C
R
V
g
C
g
V
R
R1
R2
R
C
R
OUT
OUT
ESR
f
ma
mp
L
PL
IN
S
L
O
C
C
Value
10.4
1.3*
100
402
133
0.4
3.3
3.3
7.5
2.7
15
10
60
35
5
95
90
85
80
75
70
65
60
55
50
50
100
μmho
LT3467/LT3467A
Units
mho
MHz
mΩ
MΩ
kΩ
kΩ
kΩ
μH
μF
pF
pF
Ω
200
V
V
Li-Ion to 6V
V
IN
300
= 2.7V
I
OUT
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
(mA)
400
V
IN
500
= 3.8V
V
IN
600
3467 TA02b
= 4.2V
11
700
3467afc