AME8808AEGT - Analog Microelectronics

Analog Microelectronics, Inc.

AME8808 750mA CMOS LDO

n Typical Application

n Functional Block Diagram

n Features

lVery Low Dropout Voltage

lGuaranteed 750mA Output

lAccurate to within 1.5%

l30µA Quiescent Current

lOver-Temperature Shutdown

lCurrent Limiting

lShort Circuit Current Fold-back

lSpace-Saving SOT-223 and DP AK-2 Package

lFactory Pre-set Output Voltages

lLow Temperature Coefficient

n General Description

The AME8808 family of positive, linear regulators feature

low quiescent current (30µA typ.) with low dropout volt-

age, making them ideal for battery applications. The

space-saving SOT-223 and DP AK-2 packages are attrac-

tive 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 AME8808 is stable with an output capacitance of

2.2µF or greater .

n Applications

lInstrumentation

lPortable Electronics

lWireless Devices

lCordless Phones

lPC Peripherals

lBattery Powered Widgets

lElectronic Scales

AME8808

OUT

2.2

GND

OUT

Overcurrent

Shutdown

Thermal

Shutdown

AMP

GND

OUTIN

ref

=1.215V

Analog Microelectronics, Inc.

750mA CMOS LDO

AME8808

P art Numb er M arking Ou tp u t Vo ltage P ackage Op erating T emp . Rang e

AME8808AEGT AETyww 3.3V SOT-223 -40OC to +85OC

AME8808BEGT AEUyww 3.0V SOT-223 -40OC to +85OC

AME8808CEGT AEVyww 2.8V SOT-223 -40OC to +85OC

AME8808DEGT AEWyww 2.5V SOT-223 -40OC to +85OC

AME8808EEGT AEXyww 3.8V SOT-223 -40OC to +85OC

AME8808FEGT AEYyww 3.6V SOT-223 -40OC to +85OC

AME8808GEGT AEZyww 3.5V SOT-223 -40OC to +85OC

AME8808HEGT AFAyww 2.7V SOT-223 -40OC to +85OC

AME8808IEGT AFByww 3.4V SOT-223 -40OC to +85OC

AME8808JEGT AGUyww 2.85V SOT-223 -40OC to +85OC

AME8808KEGT AHWyww 3.7V SOT-223 -40OC to +85OC

AME8808LEGT AJGyww 1.5V SOT-223 -40OC to +85OC

AME8808MEGT AJHyww 1.8V SOT-223 -40OC to +85OC

AME8808NEGT AKUyww 2.9V SOT-223 -40OC to +85OC

AME8808OEGT AKVyww 3.1V SOT-223 -40OC to +85OC

P lease consult A ME sales office or authorized Rep./Distributor for other output voltage

and package type availability.

n Pin Configuration

n Ordering Information

123

S OT -223 Top V iew

123

DPAK-2 Top View

1. GND

2. VOUT

3. VIN

1. GND

2. VOUT (Connected with heat sink)

3. VIN

Analog Microelectronics, Inc.

AME8808 750mA CMOS LDO

n Ordering Information (contd.)

Par t Number Marking Output Volt age Package Operati ng Temp. Range

AME8808AECS A M E 8808

AECS

yyww 3.3V DPAK-2 -40OC to + 85OC

AME8808BECS A M E 8808

BECS

yyww 3.0V DPAK-2 -40OC to + 85OC

AME8808CECS A M E 8808

CECS

yyww 2.8V DPAK-2 -40OC to + 85OC

AME8808DECS A M E 8808

DECS

yyww 2.5V DPAK-2 -40OC to + 85OC

AME8808EECS A M E 8808

EECS

yyww 3.8V DPAK-2 -40OC to + 85OC

AME8808FECS A M E 8808

FECS

yyww 3.6V DPAK-2 -40OC to + 85OC

AME8808GECS A M E 8808

GECS

yyww 3.5V DPAK-2 -40OC to + 85OC

AME8808HECS A M E 8808

HECS

yyww 2.7V DPAK-2 -40OC to + 85OC

AME8808IECS A M E 8808

IECS

yyww 3.4V DPAK-2 -40OC to + 85OC

AME8808JECS A M E 8808

JE CS

yyww 2.85V DPAK-2 -40OC to +85OC

AME8808KECS A M E 8808

KECS

yyww 3.7V DPAK-2 -40OC to + 85OC

AME8808LECS A M E 8808

LECS

yyww 1.5V DPAK-2 -40OC to + 85OC

AME8808MECS A M E 8808

ME CS

yyww 1.8V DPAK-2 -40OC to + 85OC

AME8808NECS A M E 8808

NECS

yyww 2.9V DPAK-2 -40OC to + 85OC

AME8808OECS A M E 8808

OECS

yyww 3.1V DPAK-2 -40OC to + 85OC

P leas e c ons ult A M E s ales offic e or authoriz ed Rep./ Dis tribut or for ot her output volt age

and package ty pe availability .

Analog Microelectronics, Inc.

750mA CMOS LDO

AME8808

n Absolute Maximum Ratings

n Recommended Operating Conditions

n Thermal Information

Parameter Maximum Unit

Input Volt age 8 V

O ut put Current 1 A

Input, Output V oltage GND - 0.3 to VDD + 0.3 V

E S D Cl as s ific at ion B

Parameter Rating Unit

S upply V ol tage 4. 5 to 5. 5 V

A m bi ent Tem perat ure Range -40 t o + 85 oC

Junct i on Tem perat ure -40 t o + 125 oC

Maximum Unit

SOT-223 160

DPAK-2 60

SOT-223 625

DPAK-2 3,000

150 oC

300 oC

Caut ion: St res s above t he li st ed absolute rat ing m ay c ause permanent dam age t o t he devic e

Parameter

oC / W

M ax i m um Lead Temperat ure ( 10 S ec )

M ax i m um Junct i on Tem perat ure

Thermal Resistance (θjc)

Internal Power Dissipation (PD)

(∆T = 1 00oC)

Analog Microelectronics, Inc.

AME8808 750mA CMOS LDO

n Electrical Specifications

Parameter Symbol Min Typ Max Units

Input Vol tage V IN Note 1 8 V

Output V ol tage Accurac y VO-1.5 1.5 %

1.5V<VO(NOM)<=2.0V 1400

Dropout Voltage V DROPOUT 2.0V<VO(NOM)<=2.8V 1000

2.8V<VO(NOM)<3.8V 750

Output Current IO750 mA

Current Limit ILIM 750 850 mA

S hort Circuit Current ISC 300 600 mA

Quiescent Current IQ30 50 µA

Ground Pin Current IGND 30 50 µA

VO < 2.0V 0.15 %

VO >= 2.0V 0.02 0.1 %

Load Regul ati on REGLOAD 0.2 1 %

Over Tem erature Shutdown OTS 150 oC

Over Temerature Hyst erisi s OTH 30 oC

VO Tem perature Coefficient TC 30 ppm/oC

f=1kHz 50

PSRR f=10kHz 20 dB

f=100kHz 15

Co=2.2mF 30

Co=100mF 20

Note1:VIN(min)=VOUT+VDROPOUT

Line Regulation REGLINE IO=5mA

VIN=VO+1 to VO+2

IO=0mA

IO=1mA to 750mA

See

chart mV

IO=1mA to 750mA

Power Supply Reject ion IO=100mA

CO=2.2mF

Output V ol tage Noi se eN f=10Hz to 100kHz

IO=10mA,CBYP=0mF mVrms

TA = 25

C unl ess otherwi se not ed

Te st Condi ti on

IO=1mA

IO=750mA

VO=VONOM -2.0%

VO>1.2V

VO<0.8V

Analog Microelectronics, Inc.

750mA CMOS LDO

AME8808

n Detailed Description

The AME8808 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 pro-

tection circuits. During normal operation, the error am-

plifier compares the output voltage to a precision refer-

ence. Over-current and Thermal shutdown circuits be-

come active when the junction temperature exceeds

150oC, or the current exceeds 750mA. During thermal

shutdown, the output voltage remains low. Normal op-

eration is restored when the junction temperature drops

below 120oC.

The AME8808 switches from voltage mode to current mode

when the load exceeds the rated output current. This

prevents over-stress. The AME8808 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.

n External Capacitors

The AME8806/8809 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 com-

paratively 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 over-

all 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.

n Enable

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.

Analog Microelectronics, Inc.

AME8808 750mA CMOS LDO

Load Step ( 1mA-600mA)

TIME ( 20mS/DIV)

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

Load

Output

=2.2

CIN=2.2

0.05

0.1

0.15

0.2

0.25

0.3

22.533.544.555.5

LOAD

=600mA

Drop Out Voltage vs. Output Voltage

Drop Out Voltage (V)

Output Voltage (V)

012345678

Ground Current vs. Input Voltage

Ground Current (µ

µµ

µA)

Input Voltage (V)

-80

-70

-60

-50

-40

-30

-20

-10

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

Power Supply Rejection Ratio

PSRR (dB)

Frequency (Hz)

100mA

10mA

1mA

100

100mA

100

=2.2

F Tantalum

BYP

Safe Operating Area

Output Current (mA)

Input-Output Voltage Differential (V)

SOT-223

DPAK-2

C rise

With HS capable of twice

Line Transient Response

VOUT (10mV/DIV) VIN(1V/DIV)

LOAD

=2.2

LOAD

=1mA

OUTDC

=3.3V

INDC

=4.5V

TIME (200mS/DIV)

Analog Microelectronics, Inc.

750mA CMOS LDO

AME8808

Short Circuit Response

OUT

(1V/DIV) I

OUT

(200mV/DIV)

TIME (2mS/DIV)

LOAD

=2.2

LOAD

<100m

Ω

Current Limit Response

IOUT (200mA/DIV) VOUT (1V/DIV)

TIME (2mS/DIV)

LOAD

=2.2

=1.0

LOAD

=3.3

Ω

OUTNOM

=3.3V

Overtemperature Shutdown

OUT

(1V/DIV) I

OUT

(200mA/DIV)

TIME (0.5Sec/DIV)

LOAD

=6.6

Ω

Noise Measurement

TIME (20mS/DIV)

Vo (1mV/ DIV)

CL = 2.2µF

NO FILTER

Analog Microelectronics, Inc.

AME8808 750mA CMOS LDO

n Package Dimension

TO-252 (DPAK)

MIN MAX MIN MAX

A 0.45 0.58 0.0177 0.023

B 1.60 1.95 0.06 0.0768

C 0.51 - 0.02 -

D 0.45 0.60 0.0177 0.0236

E 6.40 6.80 0.252 0.2677

F 5.40 5.80 0.2126 0.2283

G 2.20 2.85 0.0866 0.1122

H - * 2.30 - * 0.0906

I - 0.90 - 0.0354

J - 0.97 - 0.038

K 5.20 5.50 0.20 0.22

L 0.89 2.03 0.035 0.08

* : T ypical v alue

NOTES :

1. CONTROL L ING DIME NSION : MILLIMETE RS.

2. MAXIMUM LEAD THICKN ESS INCLUDES L E AD FINISH THICKNE SS

MINIMUM LEAD THIC K N ESS IS THE MINIMUM THIC K NESS OF B ASE

MATE RIAL .

SYMBOLS MILLIMETERS INCHES

MIN MAX MIN MAX

A 0.45 0.58 0.0177 0.023

B 1.60 1.95 0.06 0.0768

C 0.51 - 0.02 -

D 0.45 0.60 0.0177 0.0236

E 6.40 6.80 0.252 0.2677

F 5.40 5.80 0.2126 0.2283

G 2.20 2.85 0.0866 0.1122

H - * 2.30 - * 0.0906

I - 0.90 - 0.0354

J - 0.97 - 0.038

K 5.20 5.50 0.20 0.22

L 0.89 2.03 0.035 0.08

* : T ypical v alue

NOTES :

1. CONTROL L ING DIME NSION : MILLIMETE RS.

2. MAXIMUM LEAD THICKN ESS INCLUDES L E AD FINISH THICKNE SS

MINIMUM LEAD THIC K N ESS IS THE MINIMUM THIC K NESS OF B ASE

MATE RIAL .

SYMBOLS MILLIMETERS INCHES

Analog Microelectronics, Inc.

750mA CMOS LDO

AME8808

n Package Dimension

SOT-223

αMIN MAX MIN MAX

A 1.50 1.80 0.0591 0.0709

A10.02 0.10 0.0008 0.0039

B 0.60 0.838 0.0236 0.033

B12.895 3.15 0.1140 0.1240

C 0.24 0.381 0.0094 0.0150

D 6.299 6.706 0.2480 0.2640

E 3.30 3.708 0.1299 0.1460

H 6.70 7.30 0.2638 0.2874

αα

α0°10°0°10°

0.91 MIN 0.0360 MIN

2.00 MA X

0.06 BSC 0.0024 BSC

0.0787 MA X

2.30 BSC

4.60 BSC 0.090 BSC

0.181 BSC

MILLIMETERS INCHES

SYMBOLS

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-DS8808-C

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

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