參數(shù)資料
型號(hào)： REG711-5
英文描述： 50mA Switched-Cap DC/DC Converter
中文描述： 50mA的開(kāi)關(guān)第直流/直流轉(zhuǎn)換器
文件頁(yè)數(shù)： 8/13頁(yè)
文件大小： 443K
代理商： REG711-5
Table 1. Suggested Capacitors
SBAS221D
–
DECEMBER 2001
–
REVISED APRIL 2003
www.ti.com
8
CAPACITOR SELECTION
For minimum output voltage ripple, the output capacitor
C
OUT
should be a ceramic, surface-mount type. Tantalum
capacitors generally have a higher Effective Series Resist-
ance (ESR) and may contribute to higher output voltage
ripple. Leaded capacitors also increase ripple due to the
higher inductance of the package itself. To achieve best
operation with low input voltage and high load current, the
input and pump capacitors (C
IN
and C
PUMP
, respectively)
should also be surface-mount ceramic types. In all cases,
X7R or X5R dielectric are recommended. See the typical
operating circuit shown in Figure 3 for component values.
Figure 3. Typical Operating Circuit
With light loads or higher input voltage, a smaller 0.1
μ
F
pump capacitor (C
PUMP
) and smaller 1
μ
F input and output
capacitors (C
IN
and C
OUT
, respectively) can be used. To
minimize output voltage ripple, increase the output capaci-
tor, C
OUT
, to 10
μ
F or larger.
The capacitors listed in Table 1 can be used with the
REG710. This is only a representative list of those parts
that are compatible.
EFFICIENCY
The efficiency of the charge pump regulator varies with the
output voltage version, the applied input voltage, the load cur-
rent, and the internal operation mode of the device.
The approximate efficiency is given by:
Efficiency (%) = V
OUT
/(2
×
V
IN
)
×
100
(step-up operating mode)
or
V
OUT
V
IN
100
(step-down operating mode)
Table 2 lists the approximate values of the input voltage at
which the device changes internal operating mode.
See efficiency curves in the Typical Characteristics section
for various loads and input voltages.
Table 2. Operating Mode Change Versus V
IN
PRODUCT
OPERATING MODE
CHANGES AT VIN OF
> 3.2V
> 3.4V
> 3.7V
> 4.0V
Step-Up Only
REG710-2.5
REG710-2.7
REG710-3
REG710-3.3
REG710-5
LAYOUT
Large transient currents flow in the V
IN
, V
OUT
, and GND
traces. To minimize both input and output ripple, keep the
capacitors as close as possible to the regulator using
short, direct circuit traces.
A suggested PCB routing is shown in Figure 4. The trace
lengths from the input and output capacitors have been
kept as short as possible.
Figure 4.
Suggested PCB Design for Minimum Ripple
DIELECTRIC
MATERIAL
PACKAGE
SIZE
RATED
WORKING
VOLTAGE
10V
10V
6.3V
16V
16V
16V
25V
MANUFACTURER
PART NUMBER
VALUE
TOLERANCE
Kemet
C1206C255K8RAC
C1206C224K8RAC
ECJ
–
2YBOJ225K
ECJ
–
2VBIC224K
ECJ
–
2VBIC104
EMK316BJ225KL
TKM316BJ224KF
2.2
μ
F
0.22
μ
F
2.2
μ
F
0.22
μ
F
0.1
μ
F
2.2
μ
F
0.22
μ
F
±
10%
±
10%
±
10%
±
10%
±
10%
±
10%
±
10%
X7R
X7R
X5R
X7R
X7R
X7R
X7R
1206
1206
805
805
805
1206
1206
Panasonic
Taiyo Yuden
相關(guān)PDF資料
PDF描述
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REPORT Report - Lead (Pb)-Free Packaging Strategy 2000-2003
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
REG711EA-2.5 制造商:Texas Instruments 功能描述:
REG711EA-2.5/250 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
REG711EA-2.5/250G4 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
REG711EA-2.5/2K5 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
REG711EA-2.5/2K5G4 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
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