参数资料
| 型号： | MAX1720EUT |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP INV ADJ 6TSOP |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 3,000 |
| 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： | -1.5 V ~ -5.5 V，3 V ~ 11 V |
| 输入电压： | 1.5 V ~ 5.5 V |
| 频率 - 开关： | 12kHz |
| 电流 - 输出： | 50mA |
| 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-74，SOT-457 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-TSOP |
| 其它名称： | MAX1720EUTOS |
MAX1720
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C 1 will
lower the output resistance and larger values of C 2 will
reduce output voltage ripple. (See Equation 3).
Table 1 shows various values of C 1 , C 2 and C 3 with the
corresponding output resistance values at 25 ° C. Table 2
shows the output voltage ripple for various values of C 1 , C 2
and C 3 . The data in Tables 1 and 2 was measured not
calculated.
Table 1. Output Resistance vs. Capacitance
(C 1 = C 2 = C 3 ), V in = 4.75 V and V out = ?4.0 V
Voltage Inverter
The most common application for a charge pump is the
voltage inverter (Figure 14). This application uses two or
three external capacitors. The C 1 (pump capacitor) and C 2
(output capacitor) are required. The input bypass capacitor,
C 3 , may be necessary depending on the application. The
output is equal to ?V in plus any voltage drops due to loading.
Refer to Tables 1 and 2 for capacitor selection. The test setup
used for the majority of the characterization is shown in
Figure 14.
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
C 1 = C 2 = C 3
( m F)
0.7
1.4
3.3
7.3
10
24
50
R out
( W )
129.1
69.5
37.0
26.5
25.9
24.1
24
together as possible to minimize stray inductance and
capacitance. Also, use a large ground plane to minimize noise
leakage into other circuitry.
Capacitor Resources
Selecting the proper type of capacitor can reduce switching
loss. Low ESR capacitors are recommended. The MAX1720
was characterized using the capacitors listed in Table 3. This
list identifies low ESR capacitors for the voltage inverter
application.
Table 3. Capacitor Types
Table 2. Output Voltage Ripple vs. Capacitance
(C 1 = C 2 = C 3 ), V in = 4.75 V and V out = ?4.0 V
Manufacturer/Contact
AVX
843?448?9411
Part Types/Series
TPS
C 1 = C 2 = C 3
( m F)
0.7
1.4
3.3
7.3
10
24
50
Output Voltage Ripple
(mV)
382
342
255
164
132
59
38
www.avxcorp.com
Cornell Dubilier
508?996?8561
www.cornell?dubilier.com
Sanyo/Os?con
619?661?6835
www.sanyovideo.com/oscon.htm
Vishay
603?224?1961
www.vishay.com
ESRD
SN
SVP
593D
594
Input Supply Bypassing
The input voltage, V in should be capacitively bypassed to
reduce AC impedance and minimize noise effects due to the
?V out
+
1
OSC
6
switching internals in the device. If the device is loaded from
V out to GND, it is recommended that a large value capacitor
(at least equal to C 1 ) be connected from V in to GND. If the
device is loaded from V in to V out , a small (0.7 m F) capacitor
V in
+
2
5
+
between the pins is sufficient.
3
4
Capacitors = 10 m F
Figure 18. Voltage Inverter
http://onsemi.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1720EUT+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP INV -1.25V TO -5.5V 25MA 6PIN SOT-23 - Rail/Tube |
| MAX1720EUT+T | 功能描述:电荷泵 Switched-Cap Voltage Inverter w/Shutdown 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 |
| MAX1720EUTG | 功能描述:电荷泵 Switched Cap Voltage Inverter w/Shutdown 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 |
| MAX1720EUT-T | 功能描述:电荷泵 Switched-Cap Voltage Inverter w/Shutdown 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 |
| MAX1721EUT | 制造商:Maxim Integrated Products 功能描述:VOLTAGE INVERTER - Rail/Tube |
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