Analog Microelectronics AME8841REHA, AME8841OEHA, AME8841NEHA, AME8841MEHA, AME8841LEHA Datasheet

Analog Microelectronics, Inc.

AME8841

nn

n General Description

nn

The AME8841 linear regulator features low quiescent cur­rent (30µA typ.) with low dropout voltage, making it ideal
for battery applications. The space-saving SO-8 pack­age is attractive for "Pocket” and "Hand Held" applica­tions.

These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under
the "Worst" of operating conditions.

The AME8841 is stable with an output capacitance of

2.2µF or greater .

nn

n Applications

nn

l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
l Electronic Scales

600mA CMOS LDO

nn

n Features

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l Very Low Dropout Voltage
l Guaranteed 600mA Output
l Accurate to within 1.5%
l 30µA Quiescent Current
l Over-Temperature Shutdown
l Current Limiting
l Short Circuit Current Fold-back
l Power-Saving Shutdown Mode
l Space-Saving SO-8 Package
l Many fixed output voltages available
l Low Temperature Coefficient

nn

n Pin Configuration

nn

SO-8 T op View

OUT

IN

GND

OUT

AME
8841

NC
EN
NC
NC

nn

n Functional Block Diagram

nn

IN

Overcurrent

Shutdown

Thermal

Shutdown

EN

AMP

V

=1.215V

ref

R1

R2

OUT

GND

nn

n T ypical Application

nn

IN

5V

C1

1µF

IN

AME8841

GND

OUT

EN

OUT

C3

2.2µF

1

Analog Microelectronics, Inc.

AME8841

nn

n Absolute Maximum Ratings:

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Parameter Maximum Un i t

Inpu t V o lt a ge 8 V

Output Current

Input, Output Voltage GND - 0.3 to V

ESD Cla ss i fi cation B

nn

n Recomended Operating Conditions:

nn

Pa ram e ter Rating Unit

PD / (VIN - VO)

+ 0.3 V

IN

600mA CMOS LDO

A

Am bient Temperature Range -40 to +85

Junct ion Temperature -40 to +125

nn

n Thermal Paramters

nn

Parameter Maximum Unit

Thermal Resistance (
Internal Power Dis sipati on (P

o

(∆T = 10 0
Max i m um Junc tion Temperature 150

Max i m um Lead Temperature ( 10 Sec) 300

C)

) 123.7

θ

ja

)

D

810 mW

o

C

o

C

o

C / W

o

o

C

C

Caution: S tress above t he l isted abs ol ut e rat i ng may c aus e perm anent damage to the devic e

2

Analog Microelectronics, Inc.

AME8841

nn

n Ordering Information

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Part Number Marking Output Package Operating Temp.

8841

AME8841AEHA

AM E 8841B E HA

AM E 8841CE HA

AM E 8841DE HA

AM E 8841E E HA

AM E 8841F E HA

AM E 8841G E HA

AM E 8841HE HA

AM E 8841IEHA

AM E 8841JE HA

AM E 8841K E HA

AM E 8841LE HA

AM E 8841M E H A

AM E 8841NE HA

AM E 8841O E HA

AM E 8841RE HA

Pleas e cons ult A M E sales office or authorized Rep./Dis tributor for other output voltage
and pack age type availability.

AE HA

yy ww

8841

BE HA

yy ww

8841

CEHA

yy ww

8841

DEHA

yy ww

8841

EE HA

yy ww

8841

FEHA

yy ww

8841

GEHA

yy ww

8841

HEHA

yy ww

8841

IEHA

yy ww

8841

JEHA

yy ww

8841

KE HA

yy ww

8841

LEHA

yy ww

8841

ME HA

yy ww

8841

NEHA

yy ww

8841

OEHA

yy ww

8841

REHA

yy ww

3.3V SO -8

3.0V SO -8

2.8V SO -8

2.5V SO -8

3.8V SO -8

3.6V SO -8

3.5V SO -8

2.7V SO -8

3.4V SO -8

2.85V SO -8

3.7V SO -8

1.5V SO -8

1.8V SO -8

2.9V SO -8

3.1V SO -8

2.65V SO -8

O

-40

C to +85OC

O

-40

C to +85OC

O

C to +85OC

-40

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

O

-40

C to +85OC

600mA CMOS LDO

3

Analog Microelectronics, Inc.

AME8841

nn

n Electrical Specifications

nn

TA = 25oC unles s otherwis e noted

Parameter Sy mbol Min Typ Max Units

Input V oltage V
Output Vol tage Accuracy V

Dropout Voltage V

Output Current I
Current Lim it I
Short Circuit Current I
Quiescent Current I
Ground Pin Current I

Line Regulation REG

IN

O

DR OPOUT

O

LIM

SC

Q

GND

LINE

I

O

V

O=VONOM

V

IN=VO

Over Temerat ure S hutdown OTS 150
Over Temerature Hysteris is OTH 30

Temperature Coeffici ent TC 30

V

O

I

Power Suppl y Rejec tion

PSRR f=10kHz 20 dB

O

C

Test Condition

I

=1mA

O

=600mA

-2.0%

V

>1.2V

O

>1.2V

V

O

<0.8V

V

O

=0mA

I

O

I

=1mA to 600mA

O

IO=5mA

+1 to VO+2

=100mA

=2.2µF

O

1.4V<V

2.0V<V

2.8V<V

V

4.0V > V
V

<=2.0V 1400

O(NOM)

<= 2.8V 800

O(NOM)

O(NOM)

< 2.0V -0.15 0.15 %

O

>= 2.0V -0.1 0.02 0.1 %

O

>= 4.0V -0.4 0.4 %

O

f=1kHz 50

f=100kHz 15

600mA CMOS LDO

Note 1 7 V

-1.5 1.5 %

See

chart

600
600 mA
600 800 mA

300 600 mA

30 50
30 50

mV

µ
µ

ppm/

A
A

o

C

o

C

o

C

Output Vol tage Noise eN

EN Input Threshol d

EN Input B ias Current

Shut down S upply Current I
Note1:V

IN(min)=VOUT+VDROPOUT

4

f=10Hz to 100k Hz

I

=10mA,C

O

V

EH

V

EL

I

EH

I

EL

SD

=0µF

BYP

V

=2.7V to 7V

IN

=2.7V to 7V

V

IN

V

V

V

, VIN=2.7V to 7V

EN=VIN

=0V, VIN=2.7V to 7V

EN

=5V, VO=0V, VEN<V

IN

Co=2.2µF

EL

30

2.0 Vin V

00.4V

0.5 1

0.1

0.5

mVrms

A

µ

A

µ

A

µ

Analog Microelectronics, Inc.

AME8841

nn

n Detailed Description

nn

The AME8841 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier ,
over-current protection, and thermal shutdown.

The P-channel pass transistor receives data from the
error amplifier, over-current shutdown, and thermal pro­tection circuits. During normal operation, the error am­plifier compares the output voltage to a precision refer­ence. Over-current and Thermal shutdown circuits be­come active when the junction temperature exceeds
150oC, or the current exceeds 600mA. During thermal
shutdown, the output voltage remains low. Normal op­eration is restored when the junction temperature drops
below 1 10oC.

The AME8841 switches from voltage mode to current mode
when the load exceeds the rated output current. This
prevents over-stress. The AME8841 also incorporates
current foldback to reduce power dissipation when the
output is short circuited. This feature becomes active
when the output drops below 0.8 volts, and reduces the
current flow by 65%. Full current is restored when the
voltage exceeds 0.8 volts.

600mA CMOS LDO

nn

n Enable

nn

The Enable pin normally floats high. When actively,
pulled low, the PMOS pass transistor shuts off, and all
internal circuits are powered down. In this state, the
quiescent current is less than 1µA. This pin behaves
much like an electronic switch.

nn

n External Capacitors

nn

The AME8841 is stable with an output capacitor to ground
of 2.2µF or greater . Ceramic capacitors have the lowest
ESR, and will offer the best AC performance. Conversely ,
Aluminum Electrolytic capacitors exhibit the highest
ESR, resulting in the poorest AC response. Unfortunately ,
large value ceramic capacitors are comparatively expen­sive. One option is to parallel a 0.1µF ceramic capacitor
with a 10µF Aluminum Electrolytic. The benefit is low
ESR, high capacitance, and low overall cost.

A second capacitor is recommended between the input
and ground to stabilize Vin. The input capacitor should
be at least 0.1µF to have a beneficial effect.

All capacitors should be placed in close proximity to
the pins. A "Quiet" ground termination is desirable.
This can be achieved with a "Star" connection.

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Analog Microelectronics, Inc.

AME8841

A)

µ

µµ

µ

Ground Current (

0.3

0.25

0.2

0.15

0.1

Drop Out Voltage (V)

0.05

Ground Current vs. Input Voltage

45
40
35
30
25
20
15
10

5
0

012345678

85OC

25OC

Input Voltage (V)

Drop Out Voltage vs. Output Voltage

I

=600mA

LOAD

0

2 2.5 3 3.5 4 4.5 5 5.5

Output Voltage (V)

600mA CMOS LDO

Load Step ( 1mA-600mA)

Output

CL=2.2µF

CIN=2.2

µ

F

I

(200mA/DIV) Vo(10mV/DIV)

L

I

0

-10

-20

CL=2.2µF Tantalum

-30

-40

-50

PSRR (dB)

-60

-70

-80

1.0E+01 1.0E+03 1.0E+05 1.0E+07

Load

TIME ( 20mS/DIV)

Power Supply Rejection Ratio

100mA

C

=0

BYP

100mA

100µA

100µA

Frequency (Hz)

10mA

1mA

0

600

100

Output Current (mA)

10

0.1

6

Safe Operating Area

8807AEHA

8841AEHA

1.0

Input-Output Voltage Differential (V)

8.0

Analog Microelectronics, Inc.

AME8841

Vo (1mV/ DIV)

(1V/DIV)

OUT

(200mA/DIV) V

OUT

I

Noise Measurement

CL = 2.2µF

NO FILTER

TIME (20mS/DIV)

Current Limit Response

C

=2.2µF

LOAD

C

=1.0µF

IN

R

=3.3

Ω

LOAD

V

=3.3V

OUTNOM

TIME (2mS/DIV)

Overtemperature Shutdown

(200mA/DIV)

OUT

(1V/DIV) I

OUT

V

(200mV/DIV)

OUT

(1V/DIV) I

OUT

V

600mA CMOS LDO

R

=6.6

LOAD

TIME (0.5Sec/DIV)

Short Circuit Response

C

=2.2µF

LOAD

=1µF

C

IN

<100m

R

LOAD

TIME (2mS/DIV)

0

Ω

0

Ω

Chip Enable Transient Response

CL=2µF
R

=10

Ω

L

Output (1V/DIV) Enable (2V/DIV)

TIME ( 1mS/DIV)

Line Transient Response

(1V/DIV)

0

IN

(10mV/DIV) V

0

V

OUT

TIME (200mS/DIV)

C

LOAD

I

LOAD

V

OUTDC

V

INDC

=2.2µF
=1mA

=3.3V

=4.5V

7

Analog Microelectronics, Inc.

AME8841

40
38
36
34
32
30
28

Quiescent Current (uA)

26

0.65

Quiescent Current vs.Temp.

-20 0 20 40 60 80

Temperature (

0

C)

Shut Down Current vs.

Temp.

600mA CMOS LDO

EN pin vs. Temp.

-0.20

-0.25

-0.30

-0.35

-0.40

-0.45

EN pin LO bias current (uA)

-0.50

-20020406080

Temperature (0C)

Dropout Voltage vs. Temp.

500

0.60

0.55

0.50

0.45

0.40

0.35

Shut Down Current (uA)

0.30

-20 0 20 40 60 80

Temperature (0C)

Vout vs. Temp.

2.660

2.655

2.650

2.645

2.640

2.635

2.630

Vout @ Vin=Vout+2V (V)

2.625

2.620

-20 0 20 40 60 80

Temperature (0C)

480

460

440

420

400

380

Dropout Voltage @ 600mA (mV)

360

-20 0 20 40 60 80

Temperature (0C)

Load Regulation vs. Temp.

0.55

0.50

0.45

0.40

Load Regulation (%)

0.35

0.30

-20 0 20 40 60 80

Temperature (0C)

8

Analog Microelectronics, Inc.

AME8841

nn

n Package Dimension

nn

SO-8

θ

600mA CMOS LDO

SY MBO L S

A 1.35 1.75 0.053 0.069

A

1

A2

B 0.33 0.51 0.013 0.020

C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.1970
E 3.80 4.00 0.150 0.157

e
H 5.80 6.20 0.228 0.244
L 0.40 1.27 0.016 0.050

y

θθθθ

MILLIMETERS INCHES

MIN MAX MIN MAX

0.10 0.25 0.004 0.010

————

————

—

°

0

0.10 0.004

°

8

°

0

°

8

9

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Life Support Policy:

These products of Analog Microelectronics, Inc. are not authorized for use as critical components in life-

support devices or systems, without the express written approval of the president

of Analog Microelectronics, Inc.

Analog Microelectronics, Inc. reserves the right to make changes in the circuitry and specifications of its

devices and advises its customers to obtain the latest version of relevant information.

 Analog Microelectronics, Inc. , August 2001

Document: 2006-DS8841-C

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