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参数资料
| 型号： | MAX668EUB+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： | 2/18页 |
| 文件大小： | 289K |
| 代理商： | MAX668EUB+T |
MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in MAX
10
______________________________________________________________________________________
MAX669
LDO
CS+
REF
FREQ
VCC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
VIN = 1.8V to 12V
C3
0.22
F
C2
0.1
F
C4
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 @ 0.5A
C1
68
F
20V
L1
4.7
H
IRF7401
Figure 2. MAX669 High-Voltage Bootstrapped Configuration
MAX669
LDO
CS+
REF
FREQ
VCC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
VIN = 1.8V to 5V
C3
0.22
F
C2
1
F
R4
100k
1%
R1
0.02
R2
75k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
C4
68
F
10V
C5
68
F
10V
C6
0.1
F
3
5
7
6
8
2
4
9
1
10
VOUT = 5V @ 1A
C1
68
F
10V
L1
4.7
H
FDS6680
IRF7401
Figure 3. MAX669 Low-Voltage Bootstrapped Configuration
Bootstrapped Operation
With bootstrapped operation, the IC is powered from
the circuit output (VOUT). This improves efficiency
when the input voltage is low, since EXT drives the FET
with a higher gate voltage than would be available from
the low-voltage input. Higher gate voltage reduces the
FET on-resistance, increasing efficiency. Other (unde-
sirable) characteristics of bootstrapped operation are
increased IC operating power (since it has a higher
operating voltage) and reduced ability to start up with
high load current at low input voltages. If the input volt-
age range extends below 2.7V, then bootstrapped
operation with the MAX669 is the only option.
With VCC connected to VOUT, as in Figure 2, EXT volt-
age swing is 5V when VCC is 5.2V or more, and VCC -
0.2V when VCC is less than 5.2V. If the output voltage
does not exceed 5.5V, the on-chip regulator can be
disabled by connecting VCC to LDO (Figure 3). This
eliminates the LDO forward drop and supplies maxi-
mum gate drive to the external FET.
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| MAX669EUB+ | 1.8V to 28V Input, PWM Step-Up Controllers in µMAX |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX668EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX668 MAX669 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX668EVKIT+ | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX668 MAX669 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX66901-K00# | 功能描述:射频识别变换器工具 MAX66901 RF Eval Kit RoHS:否 制造商:Olimex Ltd. 产品:RFID Readers 用于:ISO15693 |
| MAX66902-K00# | 功能描述:射频识别变换器工具 HF DEVELOPER KIT RoHS:否 制造商:Olimex Ltd. 产品:RFID Readers 用于:ISO15693 |
| MAX66903-K00 | 功能描述:射频识别变换器工具 MAX6100/20/40 Eval Kit RoHS:否 制造商:Olimex Ltd. 产品:RFID Readers 用于:ISO15693 |
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