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参数资料
| 型号： | MAX669EUB+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
| 中文描述： | SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | COMPACT, UMAX-10 |
| 文件页数： | 3/18页 |
| 文件大小： | 289K |
| 代理商： | MAX669EUB+T |
Non-Bootstrapped Operation
With non-bootstrapped operation, the IC is powered
from the input voltage (VIN) or another source, such as
a logic supply. Non-bootstrapped operation (Figure 4)
is recommended (but not required) for input voltages
above 5V, since the EXT amplitude (limited to 5V by
LDO) at this voltage range is no higher than it would be
with bootstrapped operation. Note that non-boot-
strapped operation is
required if the output voltage
exceeds 28V, since this level is too high to safely con-
nect to VCC. Also note that only the MAX668 can be
used with non-bootstrapped operation.
If the input voltage does not exceed 5.5V, the on-chip
regulator can be disabled by connecting VCC to LDO
(Figure 5). This eliminates the regulator forward drop
and supplies the maximum gate drive to the external
FET for lowest on-resistance. Disabling the regulator
also reduces the non-bootstrapped minimum input volt-
age from 3V to 2.7V.
MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in MAX
______________________________________________________________________________________
11
MAX668
LDO
CS+
REF
FREQ
VCC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
VIN = 2.7V to 5.5V
C3
0.22
F
C2
1
F
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
C4
68
F
20V
C5
68
F
20V
C6
0.1
F
3
5
7
6
8
2
4
9
1
10
VOUT = 12V @ 1A
C1
68
F
10V
L1
4.7
H
FDS6680
Figure 5. MAX668 Low-Voltage Non-Bootstrapped Configuration
MAX668
LDO
CS+
REF
FREQ
VCC
PGND
FB
GND
N1
EXT
VIN = 3V to 12V
C3
0.22
F
C4
1
F
C2
0.1
F
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
C5
68
F
20V
C6
68
F
20V
C8
0.1
F
3
5
7
6
8
2
4
9
1
10
VOUT = 12V @ 1A
C1
68
F
20V
L1
4.7
H
FDS6680
SYNC/
SHDN
Figure 4. MAX668 High-Voltage Non-Bootstrapped Configuration
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