AAT3215IGV-2.6-T1 datasheet(9/18 Pages) AAT

Part #	AAT3215IGV-2.6-T1

Description	150mA CMOS High Performance LDO

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Manufacturer	AAT [Advanced Analog Technology, Inc.]

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AAT3215

150mA CMOS High Performance LDO

3215.2006.05.1.6

9

Applications Information

To assure the maximum possible performance is

obtained from the AAT3215, please refer to the fol-

lowing application recommendations.

Input Capacitor

Typically, a 1µF or larger capacitor is recommend-

ed for CIN in most applications. A CIN capacitor is

not required for basic LDO regulator operation.

However, if the AAT3215 is physically located more

than three centimeters from an input power source,

a CIN capacitor will be needed for stable operation.

CIN should be located as closely to the device VIN

pin as practically possible. CIN values greater than

1µF will offer superior input line transient response

and will assist in maximizing the highest possible

power supply ripple rejection.

Ceramic, tantalum, or aluminum electrolytic capac-

itors may be selected for CIN. There is no specific

capacitor ESR requirement for CIN. However, for

150mA LDO regulator output operation, ceramic

capacitors are recommended for CIN due to their

inherent capability over tantalum capacitors to with-

stand input current surges from low impedance

sources such as batteries in portable devices.

Output Capacitor

For proper load voltage regulation and operational

stability, a capacitor is required between pins VOUT

and GND.

The COUT capacitor connection to

the LDO regulator ground pin should be made as

direct as practically possible for maximum device

performance.

The AAT3215 has been specifically designed to

function with very low ESR ceramic capacitors.

Although the device is intended to operate with

these low ESR capacitors, it is stable over a very

wide range of capacitor ESR, thus it will also work

with higher ESR tantalum or aluminum electrolytic

capacitors.

However, for best performance,

ceramic capacitors are recommended.

Typical output capacitor values for maximum output

current conditions range from 1µF to 10µF.

Applications utilizing the exceptionally low output

noise and optimum power supply ripple rejection

characteristics of the AAT3215 should use 2.2µF or

greater for COUT. If desired, COUT may be increased

without limit.

In low output current applications where output

load is less than 10mA, the minimum value for

COUT can be as low as 0.47µF.

Bypass Capacitor and Low Noise

Applications

A bypass capacitor pin is provided to enhance the

very low noise characteristics of the AAT3215 LDO

regulator. The bypass capacitor is not necessary

for operation of the AAT3215. However, for best

device performance, a small ceramic capacitor

should be placed between the bypass pin (BYP)

and the device ground pin (GND). The value of

CBYP may range from 470pF to 10nF. For lowest

noise and best possible power supply ripple rejec-

tion performance, a 10nF capacitor should be

used. To practically realize the highest power sup-

ply ripple rejection and lowest output noise per-

formance, it is critical that the capacitor connection

between the BYP pin and GND pin be direct and

PCB traces should be as short as possible. Refer

to the PCB Layout Recommendations section of

this document for examples.

There is a relationship between the bypass capac-

itor value and the LDO regulator turn-on time. In

applications where fast device turn-on time is

desired, the value of CBYP should be reduced.

In applications where low noise performance and/

or ripple rejection are less of a concern, the bypass

capacitor may be omitted. The fastest device turn-

on time will be realized when no bypass capacitor

is used.

DC leakage on this pin can affect the LDO regula-

tor output noise and voltage regulation perform-

ance. For this reason, the use of a low leakage,

high quality ceramic (NPO or C0G type) or film

capacitor is highly recommended.

Capacitor Characteristics

Ceramic composition capacitors are highly recom-

mended over all other types of capacitors for use

with the AAT3215. Ceramic capacitors offer many

advantages over their tantalum and aluminum elec-

trolytic counterparts. A ceramic capacitor typically

has very low ESR, is lower cost, has a smaller PCB

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