参数资料
型号: ADP3605ARZ-R7
厂商: Analog Devices Inc
文件页数: 8/12页
文件大小: 0K
描述: IC REG SWITCHD CAP INV ADJ 8SOIC
标准包装: 1
类型: 切换式电容器(充电泵),反相
输出类型: 可调式
输出数: 1
输出电压: -3 V ~ -6 V
输入电压: 3 V ~ 6 V
频率 - 开关: 250kHz
电流 - 输出: 120mA
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: 标准包装
供应商设备封装: 8-SOIC
其它名称: ADP3605ARZ-R7DKR

ADP3605
THEORY OF OPERATION
The ADP3605 uses a switched capacitor principle to generate a
negative voltage from a positive input voltage. An onboard
oscillator generates a 2-phase clock to control a switching
network that transfers charge between the storage capacitors. The
switches turn on and off at a 250 kHz rate, which is generated
from an internal 500 kHz oscillator. The basic principle behind
Data Sheet
During phase one, S1 and S2 are on, charging the pump capacitor
to the input voltage. Before the next phase begins, S1 and S2 are
turned off as well as S3 and S4 to prevent any overlap. S3 and S4
are turned on during the second phase (see Figure 13), and the
charge stored in the pump capacitor is transferred to the output
capacitor.
the voltage inversion scheme is illustrated in Figure 12 and
S1 S3
V IN
+
C P
V IN
S1
S2
+
C P
S3
S4
C O
V OUT
S2
S4
V OUT
C O
Figure 12. ADP3605 Switch Configuration Charging the Pump Capacitor
Figure 13. ADP3605 Switch Configuration Charging the Output Capacitor
During the second phase, the positive terminal of the pump
capacitor is connected to ground through the variable resistance
switch (S3), and the negative terminal is connected to the output,
resulting in a voltage inversion at the output terminal. Figure 1
shows the ADP3605 block diagram.
Rev. B | Page 8 of 12
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