PAM3105VOUTCA250 datasheet(9/12 Pages) PAM

Part #	PAM3105VOUTCA250

Description	0.5A Low Voltage- Low Dropout CMOS Regulator

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Manufacturer	PAM [Power Analog Micoelectronics]

Direct Link	http://www.poweranalog.com

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The PAM3105 family of low-dropout (LDO)

regulators have several features that allow them to

apply to a wide range of applications. The family

operates with very low input voltage (1.4V) and low

dropout voltage (typically 50mV at full load),

making it an efficient stand-alone power supply or

post regulator for battery or switch mode power

supplies. The 0.5A output current makes the

PAM3105 family suitable for powering many

microprocessors. The PAM3105 family also has

low output noise (typically 40μVRMS with 2.2μF

output capacitor), making it ideal for use in telecom

equipment.

A 2.2μF or larger ceramic input bypass capacitor,

connected between VIN and GND and located

close to the PAM3105, is required for stability. A

1.0uF minimum value capacitor from VOUT to GND

is also required. To improve transient response,

noise rejection, and ripple rejection, an additional

10μF or larger,low ESR capacitor is recommended

at the output. A higher value, low ESR output

capacitor may be necessary if large, fast-rise-time

load transients are anticipated and the device is

located several inches from the power source,

especially if the minimum input voltage of 1.4 V is

used.

The PAM3105 features internal current limiting and

thermal protection. During normal operation, the

PAM3105 limits output current to approximately

1A. When current limiting engages, the output

voltage scales back linearly until the over current

condition ends. While current limiting is designed

to prevent gross device failure, care should be

taken not to exceed the power dissipation ratings

of the package. If the temperature of the device

exceeds 150°C, thermal-protection circuitry will

shut it down. Once the device has cooled down to

approximately 50°C below the high temp trip point,

regulator operation resumes.

The amount of heat that an LDO linear regulator

generates is:

Power=(V -V )I .

All integrated circuits have a m aximum

allowable junction temperature (T max) above

which normal operation is not assured. A system

designer must design the operating environment

so that the operating junction temperature (T )

does not exceed the m aximum junction

temperature

( T

m ax).

The

t wo

main

environmental variables that a designer can use

to improve thermal performance are air flow and

external heatsinks. The purpose o f t his

information is to aid the designer in determining

the proper operating environment for a linear

regulator that is operating at a specific power

level.

In general, the maximum expected power

(P (max)) consumed by a linear regulator is

computed as:

(1)

Where:

V

is the average input voltage.

V

is the average output voltage.

I

is the average output current.

I

is the quiescent current.

For most LDO regulators, the quiescent current

is insignificant compared to the average output

current; therefore, the term V

xI

can be

neglected. The operating junction temperature

is computed by adding the ambient temperature

(T ) and the increase in temperature due to the

regulator' s power dissipation. The temperature

rise is computed by multiplying the maximum

expected power dissipation by the sum of the

thermal resistances between the junction and

the case R

), the case to heatsink (R

), and

the heatsink to ambient (R

). Thermal

resistances are measures of how effectively an

object dissipates heat. Typically, the larger the

device, the more surface area available for

power dissipation so that the object 's thermal

resistance will be lower.

External Capacitor Requirements

Regulator Protection

Thermal Information

IN

O

J

D

I (avg)

O(avg)

(Q)

I(avg)

(Q)

A

JC

CS

SA

l

(

θθ

θ

Application Information

9

08/2007

()

() () () ( )

DMAX

I avg

O avg

I avg

Q

P= V

-V

×I

+V×I

PAM3105

0.5A Low Voltage- Low Dropout CMOS Regulator

,

Power Analog Microelectronics Inc

www.poweranalog.com

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