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参数资料
| 型号： | MAX669EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM HYBRID 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式，混合 |
| 输出数： | 1 |
| 频率 - 最大： | 575kHz |
| 占空比： | 94% |
| 电源电压： | 1.8 V ~ 28 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in μMAX
V IN = 3V to 12V
C1
68 μ F
20V
L1
4.7 μ H
C4
1 μ F
C2
0.1 μ F
C3
0.22 μ F
1
LDO
9
V CC
10 SYNC/
SHDN
4
REF
2
FREQ
MAX668
EXT
CS+
PGND
FB
GND
8
6
7
5
3
R1
0.02 ?
N1 D1
MBRS340T3
FDS6680
C5
68 μ F
20V
C7
220pF
C6
68 μ F
20V
R2
218k
1%
R3
24.9k
1%
C8
0.1 μ F
V OUT = 12V @ 1A
R4
100k
1%
Figure 4. MAX668 High-Voltage Non-Bootstrapped Configuration
V IN = 2.7V to 5.5V
C1
68 μ F
10V
L1
4.7 μ H
C2
1 μ F
C3
0.22 μ F
1
LDO
9
V CC
10 SYNC/
SHDN
4
REF
2
FREQ
MAX668
EXT
CS+
PGND
FB
GND
8
6
7
5
3
R1
0.02 ?
N1 D1
MBRS340T3
FDS6680
C4
68 μ F
20V
C7
220pF
C5
68 μ F
20V
R2
218k
1%
R3
24.9k
1%
C6
0.1 μ F
V OUT = 12V @ 1A
R4
100k
1%
Figure 5. MAX668 Low-Voltage Non-Bootstrapped Configuration
Non-Bootstrapped Operation
With non-bootstrapped operation, the IC is powered
from the input voltage (V IN ) 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-
Maxim Integrated
nect to V CC . 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 V CC 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.
11
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