AIC1730-24CQ datasheet(10/12 Pages) AIC

Part #	AIC1730-24CQ

Description	Low Noise Low Dropout, 150mA Linear Regulator

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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10 / 12 page

AIC1730

10

NOISE BYPASS CAPACITOR

Use a 0.1

µF bypass capacitor at BP for low

output voltage noise. Increasing the capacitance

such as 1

µF will decrease the output noise,

however,

values

above

1

µF provide no

performance

advantage

and

are

not

recommended.

POWER DISSIPATION

The maximum power dissipation of AIC1730

depends on the thermal resistance of the case

and circuit board, the temperature difference

between the die junction and ambient air, and

the rate of air flow. The rate of temperature rise is

greatly

affected

by

the

mounting

pad

configuration on the PCB, the board material,

and the ambient temperature. When the IC

mounting with good thermal conductivity is used,

the junction will be low even if the power

dissipation is great.

The power dissipation across the device is P =

IOUT (VIN-VOUT).

The maximum power dissipation is:

PMAX = (TJ-TA)/(θJB + θBA)

where

TJ-TA is the temperature difference

between the die junction and the surrounding air,

θ

JB is the thermal resistance of the package, and

θ

BA is the thermal resistance through the PCB,

copper

traces,

and

other

materials

to

the

surrounding air.

As a general rule, the lower the temperature is,

the better the reliability of the device is. So the

PCB mounting pad should provide maximum

thermal conductivity to maintain low device

temperature.

The GND pin performs the dual function of

providing an electrical connection to ground and

channeling heat away. Therefore, connecting the

GND pin to ground with a large pad or ground

plane would increase the power dissipation and

reduce the device temperature.

50

100

150

0.01

0.1

1

10

100

STABLE REGION

COUT=1µF

IOUT(mA)

50

100

150

0.01

0.1

1

10

100

STABLE REGION

COUT=2.2µF

IOUT (mA)

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AIC1730-24CQ Datasheet(PDF) 10 Page - Analog Intergrations Corporation

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