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Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n General Description
The AME8802 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-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. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The AME8802 is stable with an output capacitance of 2.2F or greater.
n Features
l l l l l l l l l l l l
Very Low Dropout Voltage Guaranteed 300mA Output Accurate to within 1.5% 30A Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Power Good Output Function Power-Saving Shutdown Mode Space-Saving SOT-25 (SOT-23-5) Factory Pre-set Output Voltages Low Temperature Coefficient
n Applications
l l l l l l l
n Functional Block Diagram
IN
Overcurrent Shutdown
OUT
Instrumentation Portable Electronics Wireless Devices Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales
Thermal Shutdown
n Typical Application
IN
AMP R1
IN PG GND OUT EN
EN
V ref x 1 1 0 %
AME8802
C1 5V 1F
OUT
PG
C2 2.2F
V ref x 9 0 %
V ref = 1 . 2 1 5 V **
R2 GND
** If output voltage specification is lower than 1.215V, Vref will be trimmed to 1.2V.
1
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n Pin Configuration
SOT-25 Top View
5 4
1. VIN 2. GND 3. EN
1 2 3
4. PG 5. OUT
n Ordering Information
Part N umber AME8802AEEV AME8802BEEV AME8802C EEV AME8802D EEV AME8802EEEV AME8802FEEV AME8802GEEV AME8802HEEV AME8802IEEV AME8802JEEV AME8802KEEV AME8802LEEV AME8802MEEV AME8802NEEV AME8802OEEV AME8802TEEV AME8802UEEV Marking AAKww AALww AAMww AANww AAOww ABPww AC Gww AEHww AEPww AGRww AHTww AJMww AJNww AKQww AKRww ARVww ASD ww Output Voltage 3.3V 3.0V 2.8V 2.5V 3.8V 3.6V 3.5V 2.7V 3.4V 2.85V 3.7V 1.5V 1.8V 2.9V 3.1V 1.2V 3.2V Package SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 Operating Temp. R ange -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 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 O O O O
# represents the date code Please consult AME sales office or authorized Rep./D istributor for other output voltage and package type availability.
2
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n Absolute Maximum Ratings
Parameter Input Voltage Output Current Output Voltage ESD Classification Maximum 8 P D / (VIN - V O) GND - 0.3 to VIN + 0.3 B Unit V mA V
n Recommended Operating Conditions
Parameter Ambient Temperature Range Junction Temperature Rating -40 to +85 -40 to +125 Unit
o
C C
o
n Thermal Information
Parameter Thermal Resistance (ja) Maximum
o
Unit
SOT-25
260
C/W
Internal Power Dissipation (P D ) ( T = 100oC) Maximum Junction Temperature
SOT-25
380
mW
150
o
C
Maximum Lead Temperature ( 10 Sec)
300
o
C
Caution: Stress above the listed absolute rating may cause permanent damage to the device
3
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n Electrical Specifications
TA = 25 o C unless otherwise noted
Parameter Input Voltage Output Voltage Accuracy Symbol V IN VO IO=300mA V O =V ON OM -2.0% IO =1mA 1.2V1.2V V O>1.2V V O<0.8V IO =0mA IO =1mA to 300mA IO =1mA V IN =V O +1 to V O+2 V O < 2.0V 2.0V<=V O < 4.0V 4.0V <= Vo Load Regulation Over Temerature Shutdown Over Temerature Hysterisis V O Temperature Coefficient REG LOAD OTS OTH TC f=1kHz Power Supply Rejection PSRR IO=100mA CO =2.2F f=10Hz to 100kHz IO =10mA f=10kHz f=100kHz Co=2.2F 2.0 0 IO =1mA to 300mA -0.15 -0.1 -0.4 -1 0.02 0.2 0.2 150 30 30 50 20 15 30 Vin 0.4 0.1 0.5 0.5 0 1 0.4 85 75 115 125 1 7 0.4 %V O(NOM) A V V %V O(NOM) Vrms V V A A A V dB 300 300 450 150 30 35 0.15 0.1 0.4 1 300 50 See chart Test Condition Min Note 1 -1.5 Typ Ma x 7 1.5 1300 400 300 mA mA mA A A % % % %
o o
Units V %
Dropout Voltage
V DR OPOU T
mV
Line Regulation
REGLIN E
C C
ppm/ oC
Output Voltage Noise
eN V EH V EL IEH IEL
EN Input Threshold
V IN =2.7V to 7V V IN =2.7V to 7V V EN =V IN , V IN =2.7V to 7V V EN =0V, V IN =2.7V to 7V V IN =5V, V O =0V, V EN EN Input Bias Current Shutdown Supply Current Shutdown Output Voltage Output Under Voltage
ISD V O,SD V UV
1.2V <= Vo < 2.5V 2.5V <=Vo <= 5.0V
Output Over Voltage PG Leakage Current PG Voltage Rating PG Voltage Low Note1:V IN (m in)=V OU T+V DR OPOU T
V OV ILC V PG V OL
1.2V <= Vo < 2.5V V PG=7V V O in regulation ISINK =0.4mA
4
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n Detailed Description
The AME8802 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown, and power good function. 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 AME8802 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8802 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.
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 Power Good
The AME8802 includes the Power Good feature. Normally, Pin 4 is "Floating", however, when the output is not within 10% of the specified voltage, it pulls low. This can occur under the following conditions: 1) 2) 3) 4) Input Voltage too low. During Over-Temperature. During Over-Current. If output is pulled up.
n External Capacitors
The AME8802 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 0.1uF 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.
5
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
Ground Current vs. Input Voltage
45
Load Step ( 1mA-300mA)
Vo(5mV/DIV) C L =2.2F C I N =2.2F
40
Output
Ground Current (A)
35 30 25
85 O C
15 10 5 0 0 1 2 3 4 5 6 7 8
IL(200mA/DIV)
20
25 O C
IL o a d
0 TIME( 20mS/DIV) Input Voltage (V)
Chip Enable Transient Response
Enable (2V/DIV) Enable (2V/DIV)
Chip Enable Transient Response
C L =2F R L =10 C B Y P =1000pF
0
C L =2F R L =10
0
Output (1V/DIV)
0 TIME ( 1mS/DIV)
Output (1V/DIV)
0 TIME ( 1mS/DIV)
Drop Out Voltage vs Output Voltage
300
Drop Out Voltage vs Load Current
250
Drop Out Voltage (mV)
250 200 150 100
IL O A D = 1 0 0 m A IL O A D= 3 0 0 m A IL O A D = 2 0 0 m A
Dropout Voltage (mV)
200
150
Top to bottom V O U T =2.5V V O U T =2.8V V O U T =3.0V V O U T =3.3V V O U T =3.5V V O U T =3.8V
100
50
50 0 2.5 2.75 3 3.25 3.5 3.75 4
0 0 50 100 150 200 250 300
6
Output Voltage (V)
Load Current (mA)
Analog Microelectronics, Inc.
AME8802
Power Supply Rejection Ratio
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 1.0E+01
100A 100A 1mA 100mA 10mA C L =2.2F Tantalum C B Y P =0 100mA
300mA CMOS LDO
1.0E+03
1.0E+05
1.0E+07
Frequency (Hz)
Overtemperature Shutdown Short Circuit Response
ILOAD (400mA/DIV) R L O A D =100 R S H O R T =0.1
I OUT (200mA/DIV)
0
R L O A D =6.6
VOUT (1V/DIV)
VOUT (1V/DIV)
0
0 0 TIME (2mS/DIV) TIME (0.5Sec/DIV)
Noise Measurement
Current Limit Response
IOUT (200mA/DIV) R L O A D =3.3
Vo (1mV/ DIV)
0
CL = 2.2F NO FILTER
VOUT (1V/DIV)
0 TIME (2mS/DIV)
TIME (20mS/DIV)
7
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
10000 1000 100
Stability vs. ESR vs ILOAD
Unstable Region
10000 1000
Stability vs. ESR vs I LOAD
Unstable Region
C L =1F
100
C L =2F Stable Region
ESR ()
ESR ()
10 1
Stable Region
10 1 0.1
0.1
Untested Region
0.01 0 50 100 150 200
0.01 0 50
Untested Region
100
150
200
ILOAD (mA)
ILOAD (mA)
Stability vs. ESR vs I LOAD
10000
Unstable Region
Stability vs. ESR vs I LOAD
10000
Unstable Region
1000
C L =3F
1000 100 100
C L =10F Stable Region
ESR ()
ESR ()
10 1 0.1 0.01
10 1 0.1
Stable Region
0.01 0 50
Untested Region
0.001 200 0 50
Untested Region
100
150
100
150
200
ILOAD (mA)
ILOAD (mA)
Transient Line Response
VIN (1V/DIV)
Safe Operating Area
Output Current (mA)
300 SOT-23-5 100
VIN DC = 5.0V
VO (1mV/DIV)
10 0.1 1.0 8.0
Input-Output Voltage Differential (V) 8
TIME (2mS/DIV)
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
Quiescent Current vs. Temp.
35
Load Regulation vs. Temp.
0.58
Quiescent Current @ 5V (uA)
Load Regulation (%)
34 33 32 31 30 29 28 27 -45 -5 25 55
0
0.56 0.54 0.52 0.50 0.48 0.46 0.44 0.42 0.40 -45 -5 25 55 85
85
Temperature ( C)
Temperature (0C)
Shut Down Current vs.Temp.
Shut Down Current (uA)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -45 -5 25 55 85
EN Pin LO Bias Current vs.Temp
EN pin LO bias current (uA)
-0.20 -0.25 -0.30 -0.35 -0.40 -0.45 -0.50 -45 -5 25 55 85
1.0
Temperature ( C)
0
Temperature (0C)
Dropout Voltage vs. Temp.
Dropout Voltage @ 300mA (mV)
220 0.45
PG VOL vs.Temp.
PG VOL @ 0.4mA (V)
0.40 0.35 0.30 0.25 0.20 0.15
210 200 190 180 170 160 150 -45 -5 25 55 85
Temperature (0C)
-45
-5
25
55
85
Temperature (0C)
9
Analog Microelectronics, Inc.
AME8802
300mA CMOS LDO
n Package Dimension
SOT-25
MILLIMETERS MIN MAX 1.00 1.45 0.00 0.70 0.35 0.08 2.70 1.40 0.15 1.25 0.55 0.25 3.10 1.80 INCHES MIN MAX 0.0394 0.0571 0.0000 0.0276 0.0138 0.0031 0.1063 0.0551 0.0591 0.0492 0.0217 0.0098 0.1220 0.0709
SY MBOLS A A1 A2 b C D E e H L 1 S1
1.90 BSC 2.60 3.00 0.30 0 0.85
0.07480 BSC 0.1024 0.1181 0.0118 0 0.0335
10 1.05
10 0.0413
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-DS8802-E
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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