XRP29302ETBTR-L datasheet(6/9 Pages) EXAR

Part #	XRP29302ETBTR-L

Description	3A Low Dropout Voltage Regulator

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Manufacturer	EXAR [Exar Corporation]

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Rev. 1.4.0

THEORY OF OPERATION

The XRP29302 incorporates protection against

over-current faults, reversed load insertion,

over temperature operation, and positive and

negative transient voltage.

THERMAL CONSIDERATIONS

Although the XRP29302 offers limiting circuitry

for overload conditions, it is still necessary to

insure

that

the

maximum

junction

temperature

is

not

exceeded

in

the

application. Heat will flow through the lowest

resistance path, the junction-to-case path. In

order to insure the best thermal flow of the

component, proper mounting is required.

TO-220 DESIGN EXAMPLE:

Assume

that

VIN =

10V,

VOUT = 5V,

IOUT = 1.5A, TA = 50°C, θHA= 1°C/W, θCH=

2°C/W, and θJC= 3C°/W, where:

TA = ambient temperature,

θHA= heatsink to ambient thermal resistance

θCH= case to heatsink thermal resistance

θJC = junction to case thermal resistance

The power calculated under these conditions

is:

7.5

And the junction temperature is calculated as

or

50 7.5 1 2 3 95°"

Reliable operation is insured.

CAPACITOR REQUIREMENTS

The output capacitor is needed to insure

stability and minimize the output noise. The

value of the capacitor varies with the load.

However, a minimum value of 10µF aluminum

capacitor will guarantee stability over all load

conditions.

A tantalum capacitor is recommended if a

faster load transient response is needed. If the

power source has high AC impedance, a 0.1µF

ceramic capacitor between input & ground is

recommended.

MINIMUM LOAD CURRENT

To ensure a proper behavior of the regulator

under light load, a minimum load of 5mA for

XRP29302 is required.

ADJUSTABLE REGULATOR DESIGN

The XRP29302 is an adjustable regulator that

can be programmed to any value between

1.25V and 16V using 2 external resistors, R1

and R2. The relationship between the resistors

and the output voltage is:

#$ #% &1.240 1(

ENABLE INPUT

The XRP29302 has an Enable function that

switches the regulator on and off. Their

thresholds are TTL compatible. When the

regulator is active, approximately 20 µA flows

through the Enable pin.

TYPICAL APPLICATION CIRCUITS

Figure 1 represents the typical implementation

for an adjustable output regulator. The values

of R1 and R2 set the output voltage value as

follows:

)*+

&1 #$

#%(

A minimum value of 10kohms is recommended

for R2 with a range between 10kΩ and 47kΩ.

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