AME1086 datasheet(5/14 Pages) AME

Part #	AME1086

Description	1.5A Low Dropout Positive Voltage Regulator

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Manufacturer	AME [Analog Microelectronics]

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

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AME, Inc.

5

AME1086

1.5A Low Dropout

Positive Voltage Regulator

n

n Application Description

1. Output voltage adjustment

Like most regulators, the AME1086 regulates the

output by comparing the output voltage to an

internally generated reference voltage. On the

adjustable version, the VREF is available exter-

nally as 1.25V between V

OUT and ADJ.

The

voltage ratio formed by R1 and R2 should be

set

to conduct 10mA (minimum output load).

The output voltage is given by the following

equation:

V

OUT = VREF ( 1 +

) + I

ADJ x R2

On fixed versions of AME1086, the voltage divider

is provided internally.

R2

R1

Figure 3

2. Thermal protection

AME1086 has thermal protection which limits

junction temperature to 150OC. However, de-

vice

functionality is only guaranteed to a maxi-

mum junction temperature of +125OC.

The power dissipation and junction temperature

for AME1086 in TO-220 package are given by

P

D = (VIN - VOUT) x IOUT

T

JUNCTION = TAMBIENT + ( PD x θJA)

Note: T

JUNCTION must not exceed 125

O

C

3. Current limit protection

AME1086 is protected against overload condi-

tions. Current protection is triggered at typi-

cally 3.0A.

4. Stability and load regulation

AME1086 requires a capacitor from VOUT to GND

to provide compensation feedback to the inter-

nal

gain stage. This is to ensure stability at

the output terminal. Typically, a 10

µF tantalum

or

50

µF aluminum electrolytic is sufficient.

Note: It is important that the ESR for this ca-

pacitor does not exceed 0.5

Ω.

The output capacitor dose not have a theoreti-

cal upper limit and increasing its value will in-

crease stability. COUT = 100

µF or more is typi-

cal for high current regulator design.

For the adjustable version, the best load regu-

lation is accomplished when the top of the

resistor divider (R1) is connected directly to the

output pin of the AME1086. When so con-

nected, R

P is not multiplied by the divider ratio.

For fixed output versions, the top of R1 is in-

ternally connected to the output and ground

pin can be connected to low side of the load.

Figure 4

V

OUT = V REF (1+

R2

R1

) + I

ADJ x R2

OUT

ADJ

IN

V

REF

I

AD J

50

µA

V

IN

V

OUT

R1

R2

C

1

OUT

ADJ

IN

V

IN

R1

R2

R

L

R

P

Parasitic

Line Resistance

Connect

R2 to load

(Connect R1 to case)

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