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参数资料
| 型号： | REG710 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 60MA SWITCHED CAP BUCK/BOOST CONVERTER |
| 中文描述： | 60mA的开关电容降压/升压变换器 |
| 文件页数： | 8/15页 |
| 文件大小： | 378K |
| 代理商： | REG710 |
Table 1. Suggested Capacitors
SBAS221E DECEMBER 2001 REVISED SEPTEMBER 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.
V
IN
Enable
V
OUT
GND
REG710
C
IN
2.2
μ
F
C
OUT
2.2
μ
F
C
0.22
μ
F
4
6
3
5
1
2
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
current, 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
CHANGES AT VIN OF
> 3.2V
> 3.4V
> 3.7V
> 4.0V
Step-Up Only
OPERATING MODE
REG710-2.5
REG710-2.7
REG710-3
REG710-3.3
REG710-5, REG71050, REG71055
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.
V
ENABLE
V
IN
C
IN
GND
C
P
V
OUT
C
OUT
AREA: < 0.08 sq. inches
Figure 4.
Suggested PCB Design for Minimum Ripple
DIELECTRIC
MATERIAL
PACKAGE
SIZE
VOLTAGE
10V
10V
6.3V
16V
16V
16V
25V
MANUFACTURER
PART NUMBER
VALUE
TOLERANCE
RATED
WORKING
Kemet
C1206C255K8RAC
C1206C224K8RAC
ECJ2YBOJ225K
ECJ2VBIC224K
ECJ2VBIC104
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REG710_07 | 制造商:BB 制造商全称:BB 功能描述:60mA Switched-Cap BUCK/BOOST CONVERTER |
| REG710_08 | 制造商:TI 制造商全称:Texas Instruments 功能描述:60mA, 5.0V, Buck/Boost Charge Pump in ThinSOT-23 and ThinQFN |
| REG710_1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:60mA, 5.0V, Buck/Boost Charge Pump in ThinSOT-23 and ThinQFN |
| REG710-25 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:30-mA Switched-Cap DC-DC Converter with fixed 2.5-V Output |
| REG710-27 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:30-mA Switched-Cap DC-DC Converter with fixed 2.7-V Output |
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