Analog Microelectronics AME8801, AME8812, AME8840 Service Manual

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Analog Microelectronics, Inc.

AME8801/8812/8840

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n General Description

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The AME8801/8840 family of positive, linear regulators feature low quiescent current (30µA typ.) with low dropout voltage, making them ideal for battery applications. The space-saving SOT-23-5 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.

In applications requiring a low noise, regulated supply, place a 1000 pF capacitor between Bypass and Ground.

The AME8801 is stable with an output capacitance of

2.2µF or greater.

300mA CMOS LDO

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n Features

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l Very Low Dropout Voltage l Guaranteed 300mA 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 Noise Reduction Bypass Capacitor l Power-Saving Shutdown Mode l Space-Saving SOT-25 (SOT-23-5) Package l Factory Pre-set Output Voltages l Low Temperature Coefficient

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n Functional Block Diagram

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IN

Overcurrent

Shutdown

Thermal

Shutdown

EN

BYP

=1.215V

V

ref

AMP

R1

R2

OUT

GND

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n Applications

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

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n T ypical Application

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INPUT

C1

5V

1µF

IN

AME8801

GND

C2

1nF

OUT

ENBYP

OUTPUT

C3

2.2

µ

F

1

Analog Microelectronics, Inc.

AME8801/8812/8840

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n Pin Configuration

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AME8801

SOT-25 Top View

5

132

1. V

IN

2. G ND 5. OUT

3. E N

nn

n Ordering Information

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4

4. BYP

1. OUT_14.EN

2. GND 5. V

3. BYP 6. OUT_2

AME8801

SOT-26 Top View

645

132

IN

AME8812

SOT-25 Top View

5

132

4

1. EN 4. OUT

2. GND 5. BYP

3. V

IN

300mA CMOS LDO

AME8840

SOT-25 Top View

5

132

1. EN 4. OUT

2. GND 5. V

3. BYP

4

IN

Part Number Marking Output Voltage Package Operating Temp. Range

AME8801AEEV AAFww 3.3V SOT-25 AME8801BEEV AAGww 3.0V SOT-25 AME8801CEEV AAHww 2.8V SOT-25 AME8801DEEV AAIww 2.5V SOT-25 AME8801EEEV AA Jww 3.8V SOT-25

AME8801FEEV ABOww 3.6V SOT-25 AME8801GEEV ACFww 3.5V SOT-25 AME8801HEEV AEGww 2.7V SOT-25

AME8801IEE V AEOww 3.4V SOT-25

AME8801JEEV AGQww 2.85V SOT-25

AME8801KEEV AHSww 3.7V SOT-25

AME8801LEEV AJOww 1.5V SOT-25 AME8801MEEV AJPww 1.8V SOT-25 AME8801NEEV AKOww 2.9V SOT-25

O

-40

C t o +85OC

O

-40

C t o +85OC

O

-40

C t o +85OC

O

-40

C t o +85OC

-40OC t o +85OC

O

-40

C t o +85OC

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

O

C t o +85OC

-40

AME8801OEEV AKPww 3.1V SOT-25 AME8801SEEV AQXww 5.0V SOT-25

AME8801JEEY ARUww 2.85V SOT-26

Pleas e co nsult AME sales off ic e or auth orized Rep./Dist ribut or f or oth er out p ut volt ag e an d p ackage type availability.

2

-40OC t o +85OC

O

-40

C t o +85OC

O

-40

C t o +85OC

Analog Microelectronics, Inc.

AME8801/8812/8840

nn

n Ordering Information

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Part Number Output Voltage Package Operating Temp. Range

AME8812AEEV 3.3 V SOT-25 AME8812BEEV 3.0V SOT-25 AME8812C E EV 2.8V S OT-25 AME8812D E EV 2.5V S OT-25 AME8812EEEV 3.8V SOT-25

AME8812FE EV 3.6V S OT-25 AME8812GEE V 3.5V SOT-25 AME8812HEEV 2.7V SOT-25

-40OC to +85OC

300mA CMOS LDO

AME8812IEEV 3.4V SOT-25

AME8812JEE V 2.8 5V SOT-25

AME8812KEEV 3.7V SOT-25

AME8812LE EV 1.5V SOT-25

AME8812MEE V 1.8V SOT-25

AME8812NEEV 2.9V SOT-25 AME8812OEE V 3.1V SOT-25

Please consult AME sales office or auth orized Rep./Distributor for other output vol tage and package type availabil ity.

-40OC to +85OC

3

Analog Microelectronics, Inc.

AME8801/8812/8840

nn

n Ordering Information

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Part Number Marki ng Output Vol t age Package Oper ati ng Tem p. Range

AME8840 A EEV ALCww 3 .3V SOT-25 AME8840BEEV ALDww 3.0V SOT-25 AME8840CEEV ALEww 2.8V SOT -25 AME8840DEEV ALFw w 2.5V SOT-25 AME8840EEEV ALGww 3.8V SOT-25

AME8840FEEV ALHww 3.6V SOT-25 AME8840GEEV ALIww 3.5V SOT-25 AME8840HEEV ALJww 2.7V SOT-25

300mA CMOS LDO

-40OC to +85OC

AME8840IEEV ALKww 3.4V SOT-25

AME8840JEEV ALLww 2.85V SOT-25

AME8840KEEV ALMww 3.7V SOT-25

AME8840LEEV ALNww 1.5V SOT-25

AME8840MEEV ALOww 1.8V SOT-25

AME8840NEEV ALPww 2.9V SOT-25 AME8840OEEV ALQww 3.1V SOT-25

Please con su l t AME sales off ice or au thorized Rep. /Distribu t or f or other out pu t v ol t age and package t ype availability .

-40OC to +85OC

4

Analog Microelectronics, Inc.

AME8801/8812/8840

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n Absolute Maximum Ratings

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Paramete r Maximum Unit

Input Volt age 8 V

Output Current P

Output V olt age GND - 0.3 to V

ESD Classification B

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n Recommended Operating Conditions

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Parameter Rating Unit

Am bient Temperature Range -40 to +85

Juncti on Temperature -40 to +125

/ (VIN - VO)mA

D

+ 0.3 V

IN

300mA CMOS LDO

o

C

o

C

nn

n Thermal Information

nn

P arameter

Thermal Resis t anc e (q

Internal Power Dissipation (P (DT = 1 00

Thermal Resis t anc e (q

Internal Power Dissipation (P (DT = 1 00

Max im um Junct ion Temperature

o

C)

o

C)

)SOT-25260

ja

)

D

)SOT-26260

ja

)

D

SOT-25 380 mW

SOT-26 380 mW

Maximum Unit

o

C / W

o

C / W

150

o

Caution: Stress above the listed absolute rating may cause permanent damage to the device

C

5

Analog Microelectronics, Inc.

AME8801/8812/8840

nn

n Electronic Specifications

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300mA CMOS LDO

TA = 25oC unless otherwise noted

Para me te r Symbol Min Typ Max Units

Input Voltage V Output Voltage Accuracy V

Dropout Voltage V

DROPOUT

Output Current I Current Limit I Short Circuit Current I Quiescent Current I Ground Pin Current I

Line Regulation REG

Load Regulation REG

IN

O

LIM

SC

Q

GND

O

LIN E

LOAD

I

V

O=VONOM

V

IN=VO

O

Test C ondition

=1m A

I

O

=300mA

-2.0%

V

>1.2V

O

>1.2V

V

O

V

<0.8V

O

=0m A

I

O

=1mA to 300mA

I

O

IO=1mA

+1 to VO+2

=1mA to 300mA

I

O

1.2V<V

2.0V<V

2.8V<V

V

2.0V<=V

4.0V <= Vo

Note 1 7 V

-1.5 1.5 %

<=2.0V 13 00

O(NOM)

<=2.8V 400

O(NOM)

300 mA 300 450 mA

< 2.0V -0.15 0.15 %

O

< 4.0V -0.1 0.02 0.1 %

O

-0.4 0.2 0.4 %

-1 0.2 1 % Over Temerature Shutdown OTS 150 Over Temerature Hysterisis OTH 3 0 V

Temperature Coefficient TC 30

O

f=1kHz 50

I

=100mA

Power Supply Rejection

PSRR f=10kHz 20 dB

O

C

O

=2.2µF

f=100kHz 15

See

char t

300

150 300 mA

30 50 35

ppm/

mV

µ µ

o

A A

C C

o

C

Output Voltage Noise eN

EN Input Thr eshold

EN Input Bias Current

Shutdown Supply Current I Shutdown Output Voltage V Note1:V

6

IN(min)=VOUT+VDROPOUT

V

I

EH

I

EL

SD

O,SD

EH

EL

f=10Hz to 100kHz

I

=10mA

O

=2.7V to 7V

V

IN

=2.7V to 7V

V

IN

V

, VIN=2.7V to 7V

EN=VIN

=0V , VIN=2.7V to 7V

EN

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

IN

IO=0.4mA, VEN<V

Co=2.2µF

EL

30

Vrms

µ

2.0 Vin V

00.4V

0.1

0.5

0.5 1

A

µ

A

µ

A

µ

00.4V

Analog Microelectronics, Inc.

AME8801/8812/8840

nn

n Detailed Description

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The AME8801/8840 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 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.

The AME8801/8840 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8801/8840 also incorporates current foldback to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.

300mA CMOS LDO

A third capacitor can be connected between the BYPASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001 ~

0.01µF. A larger capacitor improves the AC ripple re- jection, but also makes the output come up slowly . This "Soft" turn-on is desirable in some applications to limit turn-on surges.

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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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.

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n External Capacitors

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The AME8801/8840 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.

7

Analog Microelectronics, Inc.

AME8801/8812/8840

Ground Current vs. Input Voltage

45 40 35

A)

µ

µµ

µ

30 25 20 15 10

Ground Current (

5 0

012345678

Input Voltage (V)

Chip Enable Transient Response

85OC

25OC

300mA CMOS LDO

Load Step ( 1mA-300mA)

Output

I

Load

(200mA/DIV) Vo(5mV/DIV)

L

I

TIME( 20mS/DIV)

Chip Enable Transient Response

CL=2.2µF

C

=2.2µF

IN

0

CL=2µF R

=10

Ω

L

C

=1000pF

BYP

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

TIME ( 1mS/DIV)

Drop Out Voltage vs Output Voltage

300

250

200

150

100

Drop Out Voltage (mV)

50

I

LOAD

I

LOAD

=300mA

=200mA

=100mA

CL=2µF R

=10

Ω

0

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

L

0

TIME ( 1mS/DIV)

Drop Out Voltage vs Load Current

250

Top to bottom

V

=2.5V

200

150

100

50

Dropout Voltage (mV)

V V V V V

OUT OUT OUT OUT OUT OUT

=2.8V =3.0V =3.3V =3.5V =3.8V

0

2.5 2.75 3 3.25 3.5 3.75 4

8

Output Voltage (V)

0

0 50 100 150 200 250 300

Load Current (mA)

Analog Microelectronics, Inc.

AME8801/8812/8840

Power Supply Rejection Ratio

-20

-30

-40

-50

-60

PSRR (dB)

-70

-80

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

-10

-20

-30

-40

-50

PSRR ( dB)

-60

-70

-80

1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06

CL=2.2µF Tantalum

C

=1000pF

BYP

100mA

100µA

Frequency (Hz)

Power Supply Rejection Ratio

C

= 100 pF

BYP

CL = 10 µF

Tantalum

I

= 100 mA

L

C

= 1 nF

BYP

C

= 10 nF

BYP

Frequency (Hz)

100mA

1mA

10mA

C

= 0

BYP

300mA CMOS LDO

Power Supply Rejection Ratio

0

-10

-20

CL=2.2µF Tantalum

C

=0

BYP

-30

-40

-50

PSRR (dB)

100mA

-60

-70

100µA

-80

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

Frequency (Hz)

Power Supply Rejection Ratio

-10

C

-20

-30

CL = 5.6 µF

Ceramic

I

-40

-50

PSRR ( dB)

-60

-70

-80

1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05

= 100 mA

L

C

BYP

Frequency (Hz)

BYP

= 1 nF

= 0

100mA

C

BYP

10mA

1mA

C

BYP

= 10 nF

= 100 pF

Short Circuit Response

(400mA/DIV)

LOAD

(1V/DIV) I

OUT

V

R

LOAD

R

SHORT

TIME (2mS/DIV)

=100

=0.1

Overtemperature Shutdown

Ω

(200mA/DIV)

OUT

0

R

LOAD

=6.6

Ω

(1V/DIV) I

OUT

0

V

TIME (0.5Sec/DIV)

0

9

Analog Microelectronics, Inc.

AME8801/8812/8840

Current Limit Response

(200mA/DIV)

OUT

(1V/DIV) I

OUT

V

TIME (2mS/DIV)

R

LOAD

=3.3

300mA CMOS LDO

Noise Measurement

Ω

CL = 2.2µF

0

Vo (1mV/ DIV)

0

TIME (20mS/DIV)

NO FILTER

Transient Line Response

(1V/DIV)

IN

(1mV/DIV) V

O

V

TIME (2mS/DIV)

V

= 5.0V

IN DC

CL = 2.2µF

Safe Operating Area

300

SOT-23-5

100

Output Current (mA)

10

0.1

Input-Output Voltage Differential (V)

1.0

8.0

10

Analog Microelectronics, Inc.

AME8801/8812/8840

Stability vs. ESR vs I

10000

1000

100

ΩΩ

Ω)

10

ESR (Ω

0.1

0.01

10000

1000

100

)

Ω

ΩΩ

Ω

10

ESR (

0.1

0.01

Unstable Region

Stable Region

1

Untested Region

0 50 100 150 200

ILOAD (mA)

Stability vs. ESR vs I

Unstable Region

Stable Region

1

Untested Region

0 50 100 150 200

ILOAD (mA)

LOAD

CL=1µF

LOAD

CL=3µF

Stability vs. ESR vs I

10000

1000

)

Ω

ΩΩ

Ω

ESR (

Unstable Region

100

10

1

0.1

0.01 0 50 100 150 200

Stable Region

Untested Region

ILOAD (mA)

Stability vs. ESR vs I

10000

1000

)

Ω

ΩΩ

Ω

ESR (

0.001

Unstable Region

100

10

1

0.1

0.01

0 50 100 150 200

Stable Region

Untested Region

ILOAD (mA)

300mA CMOS LDO

LOAD

CL=2µF

LOAD

CL=10µF

11

Analog Microelectronics, Inc.

AME8801/8812/8840

Quiescent Current vs.Temp.

35 34 33 32 31 30 29 28 27

Quiescent Current @ 5V (uA)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

Shut Down Current (uA)

0.0

-45 -5 25 55 85

Temperature (0C)

Shut Down Current vs. Temp.

-45 -5 25 55 85

Temperature (0C)

300mA CMOS LDO

Load Regulation vs. Temp.

0.58

0.56

0.54

0.52

0.50

0.48

0.46

0.44

Load Regulation (%)

0.42

0.40

-45-5 255585

Temperature (0C)

Dropout Voltage vs. Temp.

220 210 200 190

(mV)

180 170 160

Dropout Voltage @ 300mA

150

-45 -5 25 55 85

Temperature (0C)

V

OUT

=3V

12

EN Pin LO Bias Current vs. Temp.

-0.20

-0.25

-0.30

-0.35

-0.40

-0.45

-0.50

EN pin LO bias current (uA)

-45 -5 25 55 85

Temperature (0C)

Analog Microelectronics, Inc.

AME8801/8812/8840

nn

n Package Dimension

nn

SOT-25

300mA CMOS LDO

SYMBO LS

A 1.00 1.45 0.0394 0.0571

A

1

A2 0.70 1.25 0.0276 0.0492

b 0.35 0.55 0.0138 0.0217

C 0.08 0.25 0.0031 0.0098 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709

e H 2.60 3.00 0.1024 0.1181 L 0.30 - 0.0118 -

θ1

θ1θ1

S

1

MILLIMETERS INCHES

MIN MAX MIN MAX

0.00 0.15 0.0000 0.0591

1.90 BSC 0.07480 BSC

°

0

0.85 1.05 0.0335 0.0413

°

10

°

0

°

10

SOT-26

SYMBOLS

MILLIMETERS INCHES MIN MAX MIN MAX

A 1.00 1.40 0.0394 0.0551

A

1

0.00 0.15 0.0000 0.0591

A2 0.70 1.25 0.0276 0.0492

b 0.35 0.50 0.0138 0.0197 C 0.08 0.25 0.0031 0.0098 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709

e

1.90 BSC 0.0748 BSC H 2.60 3.00 0.1024 0.1181 L 0.35 - 0.0138 -

1

θθθθ

S

1

°

0

0.85 1.05 0.0335 0.0413

°

9

°

0

°

9

13

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E-Mail: info@analogmicro.com

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-DS8801/8812/8840-E

Corporate Headquarters Asia Pacific Headquarters

Analog Microelectronics, Inc. AME, Inc.

3100 De La Cruz Blvd. Suite 201 2F, 187 Kang-Chien Road, Nei-Hu District Santa Clara, CA. 95054-2046 Taipei 114, Taiwan, R.O.C. Tel : (408) 988-2388 Tel : 886 2 2627-8687 Fax: (408) 988-2489 Fax : 886 2 2659-2989

Analog Microelectronics AME8801, AME8812, AME8840 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual