参数资料
| 型号： | MAX1720EUT |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/18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
An increase in converter output current capability with a reduction in output resistance can be obtained by paralleling two or more
devices. The output current capability is approximately equal to the number of devices paralleled. A single shared output capacitor
is sufficient for proper operation but each device does require it’s own pump capacitor. Note that the output ripple frequency will
be complex since the oscillators are not synchronized. The performance characteristics for a converter consisting of two paralleled
devices is shown below.
0
T A = 25 ° C
?1.0
Curve
A
B
V in (V)
5.0
3.0
R out ( W )
14.5
17
?2.0
?3.0
B
?4.0
?5.0
A
0
10
20
30
40
50
60
70
80
90
100
I out , OUTPUT CURRENT (mA)
Figure 36. Parallel Load Regulation, Output
Voltage vs. Output Current
Q 2
C 1
1
OSC
6
Q 1
+
+
C 2
?V out
V in
+
2
5
C 3
3
4
C 1 = C 2 = 470 m F
C 3 = 220 m F
Q 1 = PZT751
?V out = V in ?V BE(Q1) ? V BE(Q2) ?2 V F
Q 2 = PZT651
Figure 37. External Switch for Increased Negative Output Current
The output current capability of the MAX1720 can be extended beyond 600 mA with the addition of two external switch
transistors and two Schottky diodes. The output voltage is approximately equal to ?V in minus the sum of the base emitter drops of
both transistors and the forward voltage of both diodes. The performance characteristics for the converter are shown below. Note
that the output resistance is reduced to 0.9 W .
?2.2
?2.4
?2.6
?2.8
?3.0
V in = 5.0 V
R out = 0.9 W
T A = 25 ° C
?3.2
0
0.1
0.2
0.3
0.4
0.5
0.6
I out , OUTPUT CURRENT (mA)
Figure 38. Current Boosted Load Regulation, Output Voltage vs. Output Current
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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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