參數(shù)資料
型號(hào)： MAX668-MAX669
廠商： Maxim Integrated Products, Inc.
英文描述： 1.8V to 28V Input, PWM Step-Up Controllers in レMAX
中文描述： 1.8V至28V輸入，PWM升壓控制器在レ最大
文件頁數(shù)： 11/18頁
文件大小： 326K
代理商： MAX668-MAX669
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-
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.
M
1.8V to 28V Input, PWM Step-Up
Controllers in μMAX
______________________________________________________________________________________
11
MAX668
LDO
CS+
REF
FREQ
V
CC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
V
IN
= 2.7V to 5.5V
C3
0.22
μ
F
C2
1
μ
F
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
FDS6680
C4
68
μ
F
20V
C5
68
μ
F
20V
C6
0.1
μ
F
3
5
7
6
8
2
4
9
1
10
V
OUT
= 12V @ 1A
C1
68
μ
F
10V
L1
4.7
μ
H
Figure 5. MAX668 Low-Voltage Non-Bootstrapped Configuration
MAX668
LDO
CS+
REF
FREQ
V
CC
PGND
FB
GND
N1
EXT
V
IN
= 3V to 12V
C3
0.22
μ
F
C4
1
μ
F
C2
0.1
μ
F
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
FDS6680
C5
68
μ
F
20V
C6
68
μ
F
20V
C8
0.1
μ
F
3
5
7
6
8
2
4
9
1
10
V
OUT
= 12V @ 1A
C1
68
μ
F
20V
L1
4.7
μ
H
SYNC/
SHDN
Figure 4. MAX668 High-Voltage Non-Bootstrapped Configuration
相關(guān)PDF資料
PDF描述
MAX669EUB 1.8V to 28V Input, PWM Step-Up Controllers in レMAX
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MAX669 QUADRUPLE 2-INPUT POSITIVE-OR GATES 14-CDIP -55 to 125
MAX668EUB 1.8V to 28V Input, PWM Step-Up Controllers in レMAX
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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MAX6690MEE 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6690MEE+ 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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