参数资料
型号: MAX1680ESA+
厂商: Maxim Integrated Products
文件页数: 9/12页
文件大小: 0K
描述: IC REG MULTI CONFIG 125MA 8SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 100
类型: 切换式电容器(充电泵),倍增器,反相
输出数: 1
输入电压: 2 V ~ 5.5 V
频率 - 开关: 125kHz,250kHz
电流 - 输出: 125mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 8-SOIC
产品目录页面: 1410 (CN2011-ZH PDF)
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
+V INPUT
FSEL
IN
1 μ F
FSEL
IN
CAP+
SHDN
CAP+
SHDN
1 μ F
1 μ F
MAX1681
GND
LV
MAX1681
"n"
1 μ F
GND
LV
CAP-
OUT
V OUT
CAP-
OUT
1 μ F
NOTE: USE 4.7 μ F CAPACITORS FOR MAX1680.
V OUT = -V INPUT
R OUT =
R OUT OF SINGLE DEVICE
NUMBER OF DEVICES (n)
Figure 2. Paralleling MAX1680/MAX1681s to Increase Output Current
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-
+V INPUT
ed to 125mA. As the device is loaded, the output volt-
FSEL
IN
ages move toward ground. In this particular
1 μ F
D1
configuration, connect LV to GND (inverter). The diodes
used in the circuit cause a drop of approximately 0.7V
CAP+
SHDN
IN4148
in the doubler’s output voltage, impacting efficiency.
MAX1681
Compatibility with the MAX660 and
1 μ F
GND
LV
MAX860/MAX861
The MAX1680/MAX1681 can be used in place of the
MAX860/MAX861, except for the SHDN and FSEL pins.
CAP-
OUT
V OUT = -V INPUT
1 μ F
The MAX1680/MAX1681 shut down with a high input
voltage, compared with the MAX860/MAX861. The
MAX1680/MAX1681 have only two frequency choices.
1 μ F
D2
V OUT = 2V INPUT
Replacing the MAX660 with the MAX1680/MAX1681
involves a wiring change, as the external oscillator pin
NOTE: USE 4.7 μ F CAPACITORS FOR MAX1680.
IN4148
1 μ F
-V FD1
-V FD2
is replaced by the shutdown feature. Table 5 compares
the devices.
Figure 3. Combined Doubler and Inverter
_______________________________________________________________________________________
9
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