SP6201EM5-L-5-0 datasheet(14/17 Pages) EXAR

Part #	SP6201EM5-L-5-0

Description	100mA/200mA Micropower CMOS LDO Regulators

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Manufacturer	EXAR [Exar Corporation]

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regulator's transient response. The output

capacitor value may be increased without

limit. The output capacitor should have an ESR

(effective series resistance) below 5Ω and a

resonant frequency above 1MHz.

NO LOAD STABILITY

The SP6200/SP6201 will remain stable and in

regulation with no external load (other than

the internal voltage driver) unlike many other

voltage regulators. This is especially important

in CMOS RAM keep-alive applications.

THERMAL CONSIDERATIONS

The SP6200 is designed to provide 100mA of

continuous current, while the SP6201 will

provide

200mA

of

continuous

current.

Maximum power dissipation can be calculated

based on the output current and the voltage

drop across the part. To determine the

maximum power dissipation in the package,

use

the

junction-to-ambient

thermal

resistance of the device and the following

basic equation:

TJ(MAX) is the maximum junction temperature of

the die and is 125°C. TA is the ambient

operating. θJA is the junction-to-ambient

thermal resistance for the regulator and is

layout dependent.

The actual power dissipation of the regulator

circuit can be determined using one simple

equation:

Substituting PD(max) for PD and solving for the

operating conditions that are critical to the

application will give the maximum operating

conditions for the

regulator circuit. For

example, if we are operating the SP6201- 3.0V

at room temperature, with a SOT-23-5

package on a 4 layer standard board we can

determine the maximum input voltage for a

set output current.

To prevent the device from entering thermal

shutdown, maximum power dissipation cannot

be exceeded. Using the output voltage of 3.0V

and an output current of 200mA, the

maximum input voltage can be determined.

Ground pin current can be taken from the

electrical spec’s table (IGND=200µA at

IOUT=200mA). The maximum input voltage is

determined as follows:

Solving for VIN, we get:

After calculations, we find that the maximum

input voltage of a 3.0V application at 200mA

of output current in an SOT-23-5 package is

5.59V.

DUAL-SUPPLY OPERATION

When used in dual supply systems where the

regulator load is returned to a negative

supply, the output voltage must be diode

clamped to ground.

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SP6201EM5-L-5-0 Datasheet(PDF) 14 Page - Exar Corporation

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