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参数资料
| 型号： | MAX1683EUK-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4 V ~ 11 V |
| 输入电压： | 2 V ~ 5.5 V |
| 频率 - 开关： | 35kHz |
| 电流 - 输出： | 45mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
Switched-Capacitor Voltage Doublers
Cascading Devices
Devices can be cascaded to produce an even larger
voltage (Figure 3). The unloaded output voltage is nom-
inally (n + 1) x V IN , where n is the number of voltage
doublers used. This voltage is reduced by the output
resistance of the first device multiplied by the quiescent
current of the second. The output resistance increases
when devices are cascaded. Using a two-stage dou-
bler as an example, output resistance can be approxi-
mated as R OUT = 2 x R OUT1 + R OUT2 , where R OUT1 is
the output resistance of the first stage and R OUT2 is the
output resistance of the second stage. A typical value
for a two-stage voltage doubler is 60 Ω (with C1 at 10μF
for MAX1682 and 3.3μF for MAX1683). For n stages
with the same C1 value, R OUT = (2 n - 1) x R OUT1 .
INPUT
SUPPLY
VOLTAGE
Paralleling Devices
Paralleling multiple MAX1682 or MAX1683s reduces
the output resistance. Each device requires its own
pump capacitor (C1), but the reservoir capacitor (C2)
serves all devices (Figure 4). Increase C2’s value by a
factor of n, where n is the number of parallel devices.
Figure 4 shows the equation for calculating output
resistance.
Layout and Grounding
Good layout is important, primarily for good noise per-
formance. To ensure good layout, mount all compo-
nents as close together as possible, keep traces short
to minimize parasitic inductance and capacitance, and
use a ground plane.
INPUT
SUPPLY
VOLTAGE
C1
C1+
GND
MAX1682
MAX1683
IN
C1
C1+
MAX1682
GND MAX1683
IN
OUTPUT
C1
C1+
GND
MAX1682
MAX1683
IN
C1
C1+
GND
MAX1682
MAX1683
IN
C1-
OUT
C1-
OUT
VOLTAGE
C2
C1-
OUT
C1-
OUT
OUTPUT
VOLTAGE
C2
R OUT = OUT
R OF SINGLE DEVICE
NUMBER OF DEVICES
C2
Figure 3. Cascading Devices
Figure 4. Paralleling Devices
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