參數(shù)資料
型號(hào): MAX1680
廠商: Maxim Integrated Products, Inc.
英文描述: 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
中文描述: 125mA、頻率可選、開(kāi)關(guān)電容電壓變換器
文件頁(yè)數(shù): 9/12頁(yè)
文件大小: 103K
代理商: MAX1680
Combined Doubler and Inverter
Figure 3 shows a single MAX1680/MAX1681 as an
inverter and a doubler. The maximum output current is
the sum of the loads on the two outputs and is still limit-
ed to 125mA. As the device is loaded, the output volt-
ages move toward ground. In this particular
configuration, connect LV to GND (inverter). The diodes
used in the circuit cause a drop of approximately 0.7V
in the doubler’s output voltage, impacting efficiency.
Compatibility with the MAX 660 and
MAX 860/MAX 861
The MAX1680/MAX1681 can be used in place of the
MAX860/MAX861, except for the SHDN and FSEL pins.
The MAX1680/MAX1681 shut down with a high input
voltage, compared with the MAX860/MAX861. The
MAX1680/MAX1681 have only two frequency choices.
Replacing the MAX660 with the MAX1680/MAX1681
involves a wiring change, as the external oscillator pin
is replaced by the shutdown feature. Table 5 compares
the devices.
M
125mA, Frequenc y-S elec table,
S witc hed-Capac itor Voltage Converters
_______________________________________________________________________________________
9
MAX1681
GND
FSEL
IN
+V
INPUT
CAP+
SHDN
1
μ
F
1
μ
F
LV
CAP-
OUT
GND
MAX1681
"n"
FSEL
IN
CAP+
SHDN
1
μ
F
1
μ
F
1
μ
F
V
OUT
NOTE: USE 4.7
μ
F CAPACITORS FOR MAX1680.
V
OUT
= -V
INPUT
R
= R
OUT
OF SINGLE DEVICE
NUMBER OF DEVICES (n)
LV
CAP-
OUT
Figure 2. Paralleling MAX1680/MAX1681s to Increase Output Current
MAX1681
GND
FSEL
IN
+V
INPUT
CAP+
SHDN
1
μ
F
1
μ
F
1
μ
F
1
μ
F
1
μ
F
LV
CAP-
OUT
V
OUT
= -V
INPUT
D1
IN4148
D2
IN4148
V
OUT
= 2V
INPUT
-V
FD1
-V
FD2
NOTE: USE 4.7
μ
F CAPACITORS FOR MAX1680.
Figure 3. Combined Doubler and Inverter
相關(guān)PDF資料
PDF描述
MAX1680ESA 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1681ESA 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1682EUK-T Switched-Capacitor Voltage Doublers
MAX1682-MAX1683 Switched-Capacitor Voltage Doublers
MAX1683EUK-T Switched-Capacitor Voltage Doublers
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