Datasheet

PROTECTION
SHUTDOWN MODE
V
IN
Enable
V
OUT
GND
REG710
C
IN
2.2mF
C
OUT
2.2mF
C
PUMP
0.22mF
4 6
3
5
1
2
CAPACITOR SELECTION
REG710
www.ti.com ........................................................................................................................................... SBAS221G – DECEMBER 2001 – REVISED JANUARY 2009
pump capacitors (C
IN
and C
PUMP
, respectively) should
also be surface-mount ceramic types. In all cases,
The regulator has thermal shutdown circuitry that
X7R or X5R dielectric are recommended. See the
protects it from damage caused by overload
typical operating circuit shown in Figure 20 for
conditions. The thermal protection circuitry disables
component values.
the output when the junction temperature reaches
approximately +160 ° C, allowing the device to cool.
When the junction temperature cools to
approximately +140 ° C, the output circuitry is
automatically reenabled. Continuously running the
regulator into thermal shutdown can degrade
reliability. The regulator also provides current limit to
protect itself and the load.
The EN pin enables the IC when pulled high and
places it into energy-saving shutdown mode when
pulled low. When in shutdown mode, the output is
disconnected from the input and the quiescent current
is reduced to 0.01 µ A typical. This shutdown mode
functionality is only valid when V
IN
is above the
Figure 20. Typical Operating Circuit
minimum recommended operating voltage. The EN
pin cannot be left floating and must be actively
With light loads or higher input voltage, a smaller
terminated either high or low.
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 capacitor, C
OUT
, to 10 µ F or
For minimum output voltage ripple, the output
larger.
capacitor C
OUT
should be a ceramic, surface-mount
type. Tantalum capacitors generally have a higher
The capacitors listed in Table 1 can be used with the
effective series resistance (ESR) and may contribute
REG710. This table is only a representative list of
to higher output voltage ripple. Leaded capacitors
compatible parts.
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
Table 1. Suggested Capacitors
RATED
DIELECTRIC PACKAGE WORKING
MANUFACTURER PART NUMBER VALUE TOLERANCE MATERIAL SIZE VOLTAGE
C1206C255K8RAC 2.2 µ F ± 10% X7R 1206 10V
Kemet
C1206C224K8RAC 0.22 µ F ± 10% X7R 1206 10V
ECJ − 2YBOJ225K 2.2 µ F ± 10% X5R 805 6.3V
Panasonic ECJ − 2VBIC224K 0.22 µ F ± 10% X7R 805 16V
ECJ − 2VBIC104 0.1 µ F ± 10% X7R 805 16V
EMK316BJ225KL 2.2 µ F ± 10% X7R 1206 16V
Taiyo Yuden
TKM316BJ224KF 0.22 µ F ± 10% X7R 1206 25V
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