AAT3232IGV-2.8-T1 datasheet(6/10 Pages) ANALOGICTECH

Part #	AAT3232IGV-2.8-T1

Description	300mA CMOS Low Drop Out Linear Regulator

Download	10 Pages

Scroll/Zoom	100%

Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

Logo

6 / 10 page

AAT3232

300mA CMOS Low Drop Out Linear Regulator

Advanced Analogic Technologies, Inc.

1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086

(408)524-9684 Fax (408)524-9689

$1$/2*,&

7(&+

TM

3232.2000.05.0.98

Detailed Description

The AAT3232 is intended for use in systems

where minimal current consumption is desired.

During steady state operation, ground current is

30 µA typical. All remaining current is available to

run the load. This part can also be run with drop

out voltages as small as 300 mV allowing very

efficient

systems

to

be

designed.

Several

compromises have been made for this device to

operate with both low steady state current

consumption and very low drop out voltage. The

primary compromise is the requirement of larger

capacitors over those required by other power

hungry high performance LDO’s.

Since the

AAT3232 has considerably faster response than

some

ultra

low

current

consumption

LDOs

available, it should not be considered a low

performance LDO. The second compromise is

the inability to sink current. If current is sourced

by the load rather than sunk by the load, the

AAT3232 will simply stop supplying current rather

than actively reducing the output voltage. As long

as the output voltage does not exceed the

absolute maximum specification, the AAT3232 will

not be damaged.

Output Capacitor

Output capacitor size is dependent upon the

magnitude and the rate of change of the load

variation. 10 µF tantalum or 5.6 µF ceramic is

needed only if the load will change by 270 mA

(90%

of

Imax)

in

less

than

a

couple

of

microseconds. Smaller capacitors can be used if

the output current step size, or rate of change, is

less. (See graph titled Output Capacitance vs.

Load Current Step Size.) In addition, if adequate

bypassing is used at the load, the output capacitor

near the LDO can be reduced.

The AAT3232 has been optimized for operation

with capacitors that are not of the low series

resistance type. There are two benefits of using

an LDO designed to work with series resistance.

First, capacitors sized 10 µF or greater with low

ESR are generally more expensive than the

higher

ESR

types

such

as

tantalum

and

electrolytic. Secondly, output capacitors need not

be placed next to the regulator. Most applications

use a large higher-ESR capacitor placed near the

regulator and low ESR decoupling capacitors

placed near the load.

In cases where very

compact design is desirable, a small 1206 case

size ceramic capacitor and the load are placed

and connected immediately adjacent to the LDO

and the trace from the output pin to the output

capacitor should have at least 5 milliohms of

resistance.

For example at least ten squares

should be used on a one ounce copper layer.

Also see Layout Tips, below.

Enable

The enable pin is the on/off switch for the LDO.

When it is a logic high, the LDO is functioning

normally. When it is a logic low, the LDO is in a

low power, shut down mode.

It has standard

CMOS voltage levels set by the AAT3232 input

voltage. Voltages at this terminal should be within

the absolute maximum rating (-0.5V, to Vin +

0.5V). The enable pin is internally pulled up so

that it may be left floating for normal operation.

However, since the pull up current is only 500 nA,

if open drain logic is used to drive the enable pin,

several hundred microseconds may be required

for the enable voltage to reach a logic high level.

Cnoise

The LDO's internal reference can be bypassed by

connecting

a capacitor from

BYP

to

GND,

reducing most of the internally generated noise

seen at the output.

(See graph titled Output

Noise in the previous section.) A large capacitor

on Cnoise also improves the PSRR of the

AAT3232. (See

graph

titled

Power

Supply

Rejection Ratio) In addition, a large capacitor

Output Capacitance vs.

Load Current Step Size

0

1

2

3

4

5

6

7

8

9

10

0

50

100

150

200

250

300

Step size (mA)

ESR = 0.5

Ω

ESR = 1.0

Ω

ESR = 0.01

Ω

1-48

Similar Part No. - AAT3232IGV-2.8-T1

Manufacturer	Part #	Datasheet	Description
Advanced Analogic Techn...	AAT3236	448Kb / 16P	300mA CMOS High Performance LDO
Advanced Analog Technol...	AAT3236	231Kb / 18P	300mA CMOS High Performance LDO
Advanced Analogic Techn...	AAT3236	231Kb / 18P	300mA CMOS High Performance LDO
Advanced Analog Technol...	AAT3236IGV-2.5-T1	231Kb / 18P	300mA CMOS High Performance LDO
Advanced Analogic Techn...	AAT3236IGV-2.5-T1	231Kb / 18P	300mA CMOS High Performance LDO

More results

Similar Description - AAT3232IGV-2.8-T1

Manufacturer	Part #	Datasheet	Description
Infineon Technologies A...	TLF4277-2	1Mb / 25P	Low Drop Out Linear Voltage Regulator Rev. 1.0, 2014-03-13
	TLE4678-2	2Mb / 33P	Low Drop Out Linear Voltage Regulator Rev. 1.0, 2014-03-03
	TLE4291E	1Mb / 28P	Low Drop Out Linear Voltage Regulator Rev. 1.1, 2012-12-03
	TLE4678	1Mb / 37P	Low Drop Out Linear Voltage Regulator Rev. 1.2, 2014-10-17
	TLE4678-2EL	1Mb / 33P	Low Drop Out Linear Voltage Regulator Rev. 1.0, 2014-05-07
ams AG	AS1367	1Mb / 14P	150mA, Adaptive Low Drop-Out Linear Regulator
Infineon Technologies A...	TLF4949	1Mb / 23P	5V Low Drop Out Linear Voltage Regulator Rev. 1.0, 2012-05-07
Infineon Technologies A...	IFX4949	1Mb / 21P	5V Low Drop Out Linear Voltage Regulator Rev. 1.0, 2012-05-07
Power Analog Micoelectr...	PAM3112	566Kb / 16P	300mA CMOS Linear Regulator
Unisonic Technologies	UR533	232Kb / 7P	5A ADJUSTABLE/FIXED ULTRA LOW DROP-OUT LINEAR REGULATOR

More results

AAT3232IGV-2.8-T1 Datasheet(PDF) 6 Page - Advanced Analogic Technologies

AAT3232IGV-2.8-T1 Datasheet(HTML) 6 Page - Advanced Analogic Technologies

Similar Part No. - AAT3232IGV-2.8-T1

Similar Description - AAT3232IGV-2.8-T1

Html Pages

1 2 3 4 5 6 7 8 9 10

Datasheet Download

Link URL