REG710 datasheet(9/22 Pages) TI

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PROTECTION

SHUTDOWN MODE

Enable

OUT

GND

REG710

2.2mF

OUT

2.2mF

PUMP

0.22mF

CAPACITOR SELECTION

REG710

www.ti.com............................................................................................................................................... SBAS221F – DECEMBER 2001 – REVISED MARCH 2008

pump capacitors (CIN and CPUMP, 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

from

damage

caused

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

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.

A control pin on the regulator can be used to place

the device into an energy-saving shutdown mode. In

this mode, the output is disconnected from the input

as long as VIN is greater than or equal to minimum

VIN and the input quiescent current is reduced to 1µA

maximum.

Figure 20. Typical Operating Circuit

With light loads or higher input voltage, a smaller

0.1

µF pump capacitor (C

PUMP) and smaller 1µF input

For minimum output voltage ripple,

the

output

and output capacitors (CIN and COUT, respectively)

capacitor COUT should be a ceramic, surface-mount

can be used. To minimize output voltage ripple,

type. Tantalum capacitors generally have a higher

increase the output capacitor, COUT, to 10µF or

effective series resistance (ESR) and may contribute

larger.

to higher output voltage ripple. Leaded capacitors

also increase ripple due to the higher inductance of

The capacitors listed in Table 1 can be used with the

the package itself. To achieve best operation with low

REG710. This table is only a representative list of

input voltage and high load current, the input and

parts that are compatible.

Table 1. Suggested Capacitors

RATED

DIELECTRIC

PACKAGE

WORKING

MANUFACTURER

PART NUMBER

VALUE

TOLERANCE

MATERIAL

SIZE

VOLTAGE

C1206C255K8RAC

2.2

µF

±10%

X7R

1206

10V

Kemet

C1206C224K8RAC

0.22

µF

±10%

X7R

1206

10V

ECJ

−2YBOJ225K

2.2

µF

±10%

X5R

805

6.3V

Panasonic

ECJ

−2VBIC224K

0.22

µF

±10%

X7R

805

16V

ECJ

−2VBIC104

0.1

µF

±10%

X7R

805

16V

EMK316BJ225KL

2.2

µF

±10%

X7R

1206

16V

Taiyo Yuden

TKM316BJ224KF

0.22

µF

±10%

X7R

1206

25V

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