参数资料
| 型号： | ICL7660SIPA |
| 厂商： | Intersil |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL INV 8DIP |
| 标准包装： | 1,000 |
| 类型： | 切换式电容器（充电泵），倍增器，反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -1.5 V ~ -12 V，±3 V ~ ±24 V |
| 输入电压： | 1.5 V ~ 12 V |
| 频率 - 开关： | 10kHz，35kHz |
| 电流 - 输出： | 45mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
ICL7660S, ICL7660A
This is of major importance for surface mount applications
where capacitor size and cost are critical. Smaller
capacitors, such as 0.1μF, can be used in conjunction with
the Boost Pin to achieve similar output currents compared to
the device free running with C 1 = C 2 = 10μF or 100μF. (see
Figure 11).
Increasing the oscillator frequency can also be achieved by
overdriving the oscillator from an external clock, as shown in
Figure 16. In order to prevent device latchup, a 1k Ω resistor
must be used in series with the clock output. In a situation
where the designer has generated the external clock
frequency using TTL logic, the addition of a 10k Ω pull-up
resistor to V+ supply is required. Note that the pump
frequency with external clocking, as with internal clocking,
will be one-half of the clock frequency. Output transitions
occur on the positive going edge of the clock.
Positive Voltage Doubling
The ICL7660S and ICL7660A may be employed to achieve
positive voltage doubling using the circuit shown in Figure
18. In this application, the pump inverter switches of the
ICL7660S and ICL7660A are used to charge C 1 to a voltage
level of V+ -V F , where V+ is the supply voltage and V F is the
forward voltage on C 1 , plus the supply voltage (V+) is
applied through diode D 2 to capacitor C 2 . The voltage thus
created on C 2 becomes (2V+) - (2V F ) or twice the supply
voltage minus the combined forward voltage drops of diodes
D 1 and D 2 .
The source impedance of the output (V OUT ) will depend on
the output current, but for V+ = 5V and an output current of
10mA, it will be approximately 60 Ω .
V+
V+
V+
1
8
10μF
+
-
1
2
3
4
ICL7660S
ICL7660A
8
7
6
5
-
+
1k ?
10μF
V OUT
CMOS
GATE
2
3
4
ICL7660S
ICL7660A
7
6
5
+
-
D 1
D 2
C 1
+
-
C 2
V OUT =
(2V+) - (2V F )
NOTE: D 1 AND D 2 CAN BE ANY SUITABLE DIODE.
FIGURE 16. EXTERNAL CLOCKING
It is also possible to increase the conversion efficiency of the
ICL7660S and ICL7660A at low load levels by lowering the
oscillator frequency. This reduces the switching losses, and
is shown in Figure 17. However, lowering the oscillator
frequency will cause an undesirable increase in the
impedance of the pump (C 1 ) and reservoir (C 2 ) capacitors;
this is overcome by increasing the values of C 1 and C 2 by
the same factor by which the frequency has been reduced.
For example, the addition of a 100pF capacitor between pin
7 (OSC and V+) will lower the oscillator frequency to 1kHz
from its nominal frequency of 10kHz (a multiple of 10), and
thereby necessitate a corresponding increase in the value of
C 1 and C 2 (from 10μF to 100μF).
V+
FIGURE 18. POSITIVE VOLTAGE DOUBLER
Combined Negative Voltage Conversion and
Positive Supply Doubling
Figure 19 combines the functions shown in Figure 15 and
Figure 18 to provide negative voltage conversion and
positive voltage doubling simultaneously. This approach
would be suitable, for example, for generating +9V and -5V
from an existing +5V supply. In this instance, capacitors C 1
and C 3 perform the pump and reservoir functions,
respectively, for negative voltage generation, while
capacitors C 2 and C 4 are pump and reservoir, respectively,
for the doubled positive voltage. There is a penalty in this
configuration which combines both functions, however, in
that the source impedances of the generated supplies will be
somewhat higher, due to the finite impedance of the
common charge pump driver at pin 2 of the device.
1
8
C 1
+
-
2
3
4
ICL7660S
ICL7660A
7
6
5
-
+
C OSC
C 2
V OUT
FIGURE 17. LOWERING OSCILLATOR FREQUENCY
10
FN3179.7
January 23, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7660SIPAZ | 功能描述:电荷泵 W/ANNEAL CMOS VAGE CNVRTR IND RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| ICL7660SMTV | 制造商:Rochester Electronics LLC 功能描述: |
| ICL7660TV | 制造商:Harris Corporation 功能描述: |
| ICL7661SCBA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7662 WAF | 制造商:Harris Corporation 功能描述: |
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