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REG710-33 Datasheet

  • REG710-33

  • 具有固定 3.3V 输出的 30mA 开关电容 DC-DC 转换器

  • 406.79KB

  • 15页

  • TI

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REG710
www.ti.com
SBAS221E 鈭?DECEMBER 2001 鈭?REVISED SEPTEMBER 2003
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.
C
PUMP
0.22碌F
The approximate efficiency is given by:
Efficiency (%) = V
OUT
/(2
脳
V
IN
)
脳
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
Enable
V
IN
3
5
C
IN
2.2碌F
REG710
4
6
1
C
OUT
2.2碌F
PRODUCT
V
OUT
REG710-2.5
REG710-2.7
REG710-3
REG710-3.3
2 GND
REG710-5, REG71050, REG71055
OPERATING MODE
CHANGES AT VIN OF
> 3.2V
> 3.4V
> 3.7V
> 4.0V
Step-Up Only
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
OUT
V
IN
Figure 3. Typical Operating Circuit
With light loads or higher input voltage, a smaller 0.1碌F
pump capacitor (C
PUMP
) and smaller 1碌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碌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.
AREA: < 0.08 sq. inches
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.
C
P
C
IN
GND
C
OUT
Figure 4.
Suggested PCB Design for Minimum Ripple
Table 1. Suggested Capacitors
MANUFACTURER
Kemet
Panasonic
PART NUMBER
C1206C255K8RAC
C1206C224K8RAC
ECJ鈭?YBOJ225K
ECJ鈭?VBIC224K
ECJ鈭?VBIC104
EMK316BJ225KL
TKM316BJ224KF
VALUE
2.2碌F
0.22碌F
2.2碌F
0.22碌F
0.1碌F
2.2碌F
0.22碌F
TOLERANCE
卤10%
卤10%
卤10%
卤10%
卤10%
卤10%
卤10%
DIELECTRIC
MATERIAL
X7R
X7R
X5R
X7R
X7R
X7R
X7R
PACKAGE
SIZE
1206
1206
805
805
805
1206
1206
RATED
WORKING
VOLTAGE
10V
10V
6.3V
16V
16V
16V
25V
Taiyo Yuden
8

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