参数资料
| 型号： | NCP1729SN35T1 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/22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： | 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： | -1.15 V ~ -5.5 V，2.3 V ~ 11 V |
| 输入电压： | 1.15 V ~ 5.5 V |
| 频率 - 开关： | 35kHz |
| 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： | 剪切带 (CT) |
| 供应商设备封装： | 6-TSOP |
| 其它名称： | NCP1729SN35T1OSCT |
NCP1729
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
C 1 = C 2 = C 3 ( m F) R out ( W )
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
between the pins is sufficient.
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.
0.68
1.3
3.3
7.3
10
24
50
55.4
36.9
26.0
25.8
25.5
25.0
24.0
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
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
NCP1729 was characterized using the capacitors listed in
Table 2. Output Voltage Ripple vs. Capacitance
(C 1 = C 2 = C 3 ), V in = 4.75 V and V out = ?4.0 V
Table 3. This list identifies low ESR capacitors for the
voltage inverter application.
C 1 = C 2 = C 3
( m F)
Output Voltage Ripple
(mV)
Table 3. Capacitor Types
0.68
1.3
3.3
7.3
10
322
205
120
69
56
Manufacturer/Contact
AVX
843?448?9411
www.avxcorp.com
Cornell Dubilier
508?996?8561
Part Types/Series
TPS
ESRD
www.cornell?dubilier.com
24
32
50
20
Sanyo/Os?con
619?661?6835
www.sanyovideo.com/oscon.htm
SN
SVP
Input Supply Bypassing
The input voltage, V in should be capacitively bypassed to
reduce AC impedance and minimize noise effects due to the
Vishay
603?224?1961
www.vishay.com
593D
594
switching internals in the device. If the device is loaded from
http://onsemi.com
6
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