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参数资料
| 型号： | ICL7660ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 20MA 8SOIC |
| 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），分配器，倍增器，反相 |
| 输出数： | 1 |
| 输入电压： | 1.5 V ~ 10 V |
| 频率 - 开关： | 10kHz |
| 电流 - 输出： | 20mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
MAX1044/ICL7660
Switched-Capacitor Voltage Converters
P CONV.LOSS = ? C1 (V + ) 2 ? V OUT ? +
?
? 2
The first term is the effective resistance from the
switched-capacitor circuit.
Conversion losses occur during the transfer of charge
between capacitors C1 and C2 when there is a voltage
difference between them. The power loss is:
? 1 2
? ?
oscillator to 400Hz by connecting a 100pF capacitor to
OSC reduces the quiescent current to about 15μA.
Maintaining 20mA output current capability requires
increasing the bucket and reservoir capacitors to
100μF.
Note that lower capacitor values can be used for lower
output currents. For example, setting the oscillator to
40Hz by connecting a 1000pF capacitor to OSC pro-
C2 V RIPPLE ? 2V OUT RIPPLE ? ? x f OSC / 2
?
2 ?
?
? ?
1
2
V
Increasing Efficiency
vides the highest efficiency possible. Leaving the bucket
and reservoir capacitors at 100μF gives a maximum
I OUT of 2mA, a no-load quiescent current of 10μA, and
a power conversion efficiency of 98%.
V RIPPLE ? ?
+ 2 x ESR C2 ? I OUT
Efficiency can be improved by lowering output voltage
ripple and output impedance. Both output voltage rip-
ple and output impedance can be reduced by using
large capacitors with low ESR.
The output voltage ripple can be calculated by noting
that the output current is supplied solely from capacitor
C2 during one-half of the charge-pump cycle.
? 1 ?
? 2 x f OSC x C2 ?
Slowing the oscillator frequency reduces quiescent cur-
rent. The oscillator frequency can be reduced by con-
necting a capacitor to the OSC pin.
Reducing the oscillator frequency increases the ripple
voltage in the MAX1044/ICL7660. Compensate by
increasing the values of the bucket and reservoir
capacitors. For example, in a negative voltage converter,
the pump frequency is around 4kHz or 5kHz. With the
recommended 10μF bucket and reservoir capacitors,
the circuit consumes about 70μA of quiescent current
while providing 20mA of output current. Setting the
General Precautions
1) Connecting any input terminal to voltages greater
than V+ or less than ground may cause latchup. Do
not apply any input sources operating from external
supplies before device power-up.
2) Never exceed maximum supply voltage ratings.
3) Do not connect C1 and C2 with the wrong polarity.
4) Do not short V+ to ground for extended periods with
supply voltages above 5.5V present on other pins.
5) Ensure that V OUT (pin 5) does not go more positive
than GND (pin 3). Adding a diode in parallel with
C2, with the anode connected to V OUT and cathode
to LV, will prevent this condition.
________________Application Circuits
Negative Voltage Converter
Figure 8 shows a negative voltage converter, the most
popular application of the MAX1044/ICL7660. Only two
external capacitors are needed. A third power-supply
bypass capacitor is recommended (0.1μF to 10μF)
V+
1
8
1
BOOST
8
V+
C1
10μF
2
3
4
MAX1044
ICL7660
LV
7
6
5
C BYPASS
0.1μF
V OUT = -(V+)
2
3
4
MAX1044
ICL7660
7
6
5
V OUT = 2(V+) - 2V D
C1
C2
C2
10μF
Figure 8. Negative Voltage Converter with BOOST and LV
Connections
Maxim Integrated
Figure 9. Voltage Doubler
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7660IJA | 功能描述:电荷泵 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 |
| ICL7660IPA | 功能描述:电荷泵 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 |
| ICL7660IPA+ | 功能描述:电荷泵 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 |
| ICL7660ISA | 功能描述:电荷泵 Switched-Capacitor Voltage Converter 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 |
| ICL7660ISA+ | 功能描述:电荷泵 Switched-Capacitor Voltage Converter 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 |
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