SPX2941 View Datasheet(PDF) - Signal Processing Technologies

Part Name

Description

Manufacturer

SPX2941

1A Low Dropout Voltage Regulator Adjustable Output, Fast Response

Signal Processing Technologies 

The SPX2941 incorporates protec-

tion against over-current faults, re-

versed load insertion, over temper-

ature operation, and positive and

negative transient voltage.

Thermal Considerations

Although the SPX2941 offers limit-

ing 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 re-

sistance path, the junction-to-case

path. The tab of the device is elec-

trically connected to GND. In order

to insure the best thermal flow of

the component, proper mounting is

required. Consult heatsink manu-

facturer for thermal resistance and

design of heatsink.

Power dissipation is calculated as fol-

lows:

PD = (VIN -VOUT)•(IOUT)

Maximum Junction Temperature range:

APPLICATION INFORMATION

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 a

high AC impedance, a 0.1μF ce-

ramic capacitor between input &

ground is recommended.

Minimum Load Current

To ensure a proper behavior of the

regulator under light load, a mini-

mum load of 5mA for SPX2941 is

required.

Typical Application Circuit

Figure 19 shows a typical applica-

tions circuit for an adjustable output

regulator. The values of R1 and R2

set the output voltage value as fol-

lows:

VOUT = VREF • [1 + (R1/R2)].

A minimum value of 10kΩ is rec-

ommended for R2 with a range be-

tween 10kΩ to 47kΩ.

TJ = TA(max) + PD• θJA (thermal resis-

tance, junction-to-ambient)

Maximum junction temperature must

not exceed 125°C.

VIN

6.8µF +

4 SPX2941 5

VOUT

EN 2

31

+

R1 10µF

GND

ADJ

Capacitor Requirements

The output capacitor is needed to

insure stability and minimize the

output noise. The value of the ca-

pacitor varies with the load. How-

ever, a minimum value of 10μF

R2

Figure 19. Adjustable Output

Linear Regulator

Date: Sept 28-06 Rev E

SPX2941 1A Low Dropout Linear Regulator



© 2006 Sipex Corporation

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