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Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n General Description
The AME8808 family of positive, linear regulators feature low quiescent current (30A typ.) with low dropout voltage, making them ideal for battery applications. The space-saving SOT-223 and DPAK-2 packages are 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.
n Features
l l l l l l l l l l
The AME8808 is stable with an output capacitance of 2.2F or greater.
Very Low Dropout Voltage Guaranteed 750mA Output Accurate to within 1.5% 30A Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Space-Saving SOT-223 and DPAK-2 Package Factory Pre-set Output Voltages Low Temperature Coefficient
n Applications
l l
n Functional Block Diagram
IN OUT
l l l l l
Instrumentation Portable Electronics Wireless Devices Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales
Overcurrent Shutdown
Thermal Shutdown
R1
n Typical Application
IN
IN
OUT AME8808
GND OUT
AMP
C1 5V
V ref=1.215V R2 GND
C2 2.2F
1F
1
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Pin Configuration
S O T -223 T op V iew D P A K -2 T op V iew
1. GND 2. VOUT 3. VIN
1 2 3 1 2 3
1. GND 2. VOUT (Connected with heat sink) 3. VIN
n Ordering Information
P a rt N u m b e r A ME 8808A E GT A ME 8808B E GT A ME 8808C E GT A ME 8808D E GT A ME 8808E E GT A ME 8808FE GT A ME 8808GE GT A ME 8808HE GT A M E 8 8 0 8 IE G T A M E 8808JE GT A ME 8808K E GT A ME 8808LE GT A ME 8808M E GT A ME 8808NE GT A ME 8808OE GT M a rk in g A E Tyw w A E U yw w A E V yw w A E W yw w A E X yw w A E Yyw w A E Zyw w A F A yw w A F B yw w A G U yw w A H W yw w A J G yw w A J H yw w A K U yw w A K V yw w O u tp u t V o lta g e 3 .3 V 3 .0 V 2 .8 V 2 .5 V 3 .8 V 3 .6 V 3 .5 V 2 .7 V 3 .4 V 2 .8 5 V 3 .7 V 1 .5 V 1 .8 V 2 .9 V 3 .1 V P ackage S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 S O T-2 2 3 O p e ra tin g T e m p . R a n g e -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C -4 0 C to + 8 5 C
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
P le a s e c o ns ult A M E s a le s o ffic e o r a utho rize d R e p ./D is trib uto r fo r o the r o utp ut vo lta g e a nd p a c k a g e typ e a va ila b ility.
2
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Ordering Information (contd.)
Part Number
AME8808AECS
Marking
AME8808 AECS yyww AME8808 BECS yyww AME8808 CECS yyww AME8808 DECS yyww AME8808 EECS yyww AME8808 FECS yyww AME8808 GECS yyww AME8808 HECS yyww AME8808 IECS yyww AME8808 JECS yyww AME8808 KECS yyww AME8808 LECS yyww AME8808 MECS yyww AME8808 NECS yyww AME8808 OECS yyww
Output Voltage Package Operating Temp. Range
3.3V DPAK-2 -40O C to +85OC
AME8808BECS
3.0V
DPAK-2
-40O C to +85OC
AME8808CECS
2.8V
DPAK-2
-40O C to +85OC
AME8808DECS
2.5V
DPAK-2
-40O C to +85OC
AME8808EECS
3.8V
DPAK-2
-40O C to +85OC
AME8808FECS
3.6V
DPAK-2
-40O C to +85OC
AME8808GECS
3.5V
DPAK-2
-40O C to +85OC
AME8808HECS
2.7V
DPAK-2
-40O C to +85OC
AME8808IECS
3.4V
DPAK-2
-40O C to +85OC
AME8808JECS
2.85V
DPAK-2
-40O C to +85OC
AME8808KECS
3.7V
DPAK-2
-40O C to +85OC
AME8808LECS
1.5V
DPAK-2
-40O C to +85OC
AME8808MECS
1.8V
DPAK-2
-40O C to +85OC
AME8808NECS
2.9V
DPAK-2
-40O C to +85OC
AME8808OECS
3.1V
DPAK-2
-40O C to +85OC
Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
3
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Absolute Maximum Ratings
Pa ra m e te r Input Voltage Output Current Input, Output Voltage ESD Classification Maximum 8 1 GND - 0.3 to V D D + 0.3 B Unit V A V
n Recommended Operating Conditions
Parameter Supply Voltage Ambient Temperature Range Junction Temperature Rating 4.5 to 5.5 -40 to +85 -40 to +125 Unit V
o
C C
o
n Thermal Information
Parameter SOT-223 Thermal Resistance (jc ) DPAK-2 60 Maximum 160
o
Unit
C/W
SOT-223 Internal Power Dissipation (PD ) ( T = 100oC) DPAK-2
625 mW 3,000
o
Maximum Junction Temperature
150
C
Maximum Lead Temperature ( 10 Sec)
300
o
C
Caution: Stress above the listed absolute rating may cause permanent damage to the device
4
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Electrical Specifications
TA = 25 o C unless otherwise noted
Parameter Input Voltage Output Voltage Accuracy Symbol VIN VO IO=750mA VO=VONOM -2.0% IO=1mA 1.5V1.2V VO>1.2V VO<0.8V IO=0mA IO=1mA to 750mA IO=5mA VIN=VO+1 to VO+2 VO < 2.0V VO >= 2.0V 0.02 0.2 150 30 30 50 20 15 30 20 mVrms dB 750 750 850 300 30 30 600 50 50 0.15 0.1 1 See chart Test Condition Min Note 1 -1.5 Typ Max 8 1.5 1400 1000 750 mA mA mA A A % % %
o o
Units V %
Dropout Voltage
VDROPOUT
mV
IO=1mA to 750mA
C C
ppm/oC
5
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
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 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 750mA. During thermal shutdown, the output voltage remains low. Normal operation 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 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 1A. This pin behaves much like an electronic switch.
n External Capacitors
The AME8806/8809 is stable with an output capacitor to ground of 2.2F 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 0.1F ceramic capacitor with a 10F 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 0.1F 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.
6
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
Ground Current vs. Input Voltage
45 40
Load Step ( 1mA-600mA)
Vo(10mV/DIV)
Ground Current (A)
35 30 25 20 15 10 5 0 0 1 2 3 4
85 O C
Output C L =2.2F CIN=2.2F
25 O C IL(200mA/DIV)
IL o a d
0 TIME ( 20mS/DIV)
5
6
7
8
Input Voltage (V)
Drop Out Voltage vs. Output Voltage
0.3
Power Supply Rejection Ratio
0 -10
Drop Out Voltage (V)
0.25 0.2 0.15 0.1 0.05 0 2 2.5 3 3.5
IL O A D = 6 0 0 m A
-20 PSRR (dB) -30 -40 -50 -60 -70
C L =2.2 F Tantalum C B Y P =0
100mA
100mA
10mA
100 A
100 A
1mA
4
4.5
5
5.5
-80 1.0E+01
1.0E+03
1.0E+05
1.0E+07
Output Voltage (V)
Frequency (Hz)
Safe Operating Area
VIN(1V/DIV)
Line Transient Response
Output Current (mA)
75 O C rise
SOT-223 DPAK-2
With HS capable of twice jc
VOUT (10mV/DIV)
C L O A D =2.2F IL O A D = 1 m A V O U T D C =3.3V V I N D C =4.5V
Input-Output Voltage Differential (V)
TIME (200mS/DIV) 7
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
Noise Measurement
I OUT (200mA/DIV)
Overtemperature Shutdown
Vo (1mV/ DIV)
CL = 2.2F NO FILTER
0
R L O A D =6.6
VOUT (1V/DIV)
0 TIME (0.5Sec/DIV)
TIME (20mS/DIV)
Current Limit Response
IOUT (200mA/DIV) VOUT (1V/DIV)
I OUT (200mV/DIV)
Short Circuit Response
C L O A D =2.2F C IN = 1F R L O A D < 1 0 0 m
V OUT (1V/DIV)
C L O A D =2.2F C I N =1.0F R L O A D =3.3 V O U T N O M =3.3V
TIME (2mS/DIV)
TIME (2mS/DIV)
8
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Package Dimension
TO-252 (DPAK)
SYMBOLS A B C D E F G H I J K L * : Typical value
NOTES : 1. CONTROLLING DIMENSION : MILLIMETERS. 2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.
MILLIMETERS MIN MAX 0.45 0.58 1.60 1.95 0.51 0.45 0.60 6.40 6.80 5.40 5.80 2.20 2.85 * 2.30 0.90 0.97 5.20 5.50 0.89 2.03
INCHES MIN MAX 0.0177 0.023 0.06 0.0768 0.02 0.0177 0.0236 0.252 0.2677 0.2126 0.2283 0.0866 0.1122 * 0.0906 0.0354 0.038 0.20 0.22 0.035 0.08
TO-252 (DPAK)
SYMBOLS A B C D E F G H I J K L * : Typical value
NOTES :
MILLIMETERS MIN MAX 0.45 0.58 1.60 1.95 0.51 0.45 0.60 6.40 6.80 5.40 5.80 2.20 2.85 * 2.30 0.90 0.97 5.20 5.50 0.89 2.03
INCHES MIN MAX 0.0177 0.023 0.06 0.0768 0.02 0.0177 0.0236 0.252 0.2677 0.2126 0.2283 0.0866 0.1122 * 0.0906 0.0354 0.038 0.20 0.22 0.035 0.08
1. CONTROLLING DIMENSION : MILLIMETERS. 2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.
9
Analog Microelectronics, Inc.
AME8808
750mA CMOS LDO
n Package Dimension
SOT-223
SYMBOLS A A1 B B1 C D E e e1 H L L1 L2
MILLIMETERS MIN MAX 1.50 1.80 0.02 0.60 2.895 0.24 0.10 0.838 3.15 0.381
INCHES MIN MAX 0.0591 0.0709 0.0008 0.0236 0.1140 0.0094 0.0039 0.033 0.1240 0.0150
6.299 6.706 3.30 3.708 2.30 BSC 4.60 BSC 6.70 7.30 0.91 MIN 2.00 MAX 0.06 BSC 0
0.2480 0.2640 0.1299 0.1460 0.090 BSC 0.181 BSC 0.2638 0.2874 0.0360 MIN 0.0787 MAX 0.0024 BSC
10
0
10
10
www.analogmicro.com
E-Mail: info@analogmicro.com
Life Support Policy: These products of Analog Microelectronics, Inc. are not authorized for use as critical components in lifesupport 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. (c) Analog Microelectronics, Inc., August 2001 Document: 2006-DS8808-C
Corporate Headquarters
Analog Microelectronics, Inc.
3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489
Asia Pacific Headquarters
AME, Inc.
2F, 187 Kang-Chien Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. Tel : 886 2 2627-8687 Fax : 886 2 2659-2989

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