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Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n General Description
The AME8817 family of positive, linear regulators feature low quiescent current (35A typ.) with low dropout voltage, making them ideal for battery applications. Output voltages are set at the factory and trimmed to 1.5% accuracy. 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 1000pF capacitor between Bypass and Ground. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The AME8817 is stable with an output capacitance of 4.7F or greater.
n Features
l l l l l l l l l l l
Very Low Dropout Voltage Guaranteed 1.5A Output Accurate to within 1.5% 35A Quiescent Current Typically Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Noise Reduction Bypass Capacitor Power Good Output Power-Saving Shutdown Mode Space-Saving DDPAK-7 Package
l Low Temperature Coefficient
n Applications
l l l l l
n Functional Block Diagram
IN OUT
Instrumentation Portable Electronics Wireless Devices PC Peripherals Battery Powered Widgets
Overcurrent Shutdown
Thermal Shutdown
n Typical Application
R1
IN
BYP (or ADJ)
IN BYP GND
OUT
OUT
AME8817 P G
EN
AMP PG EN
C1 5V
C2
C3
1 F
1nF
4.7 F
1.24V
R2 GND
1
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n Pin Configuration
DDPAK-7 (TO-263) Top View
AME8817AEDZXXX AME8817BEDZXXX
1
2
3
4
5
6
7
1. 2. 3. 4.
EN PG VIN GND
5. VOUT 6. VOUT 7. BYP
1 2 3 4 5 6 7
1. 2. 3. 4.
EN PG VIN GND
5. VOUT 6. VOUT 7. ADJ
n Ordering Information
Output Voltage
1.50
Package Type DDPAK-7
AME8817AEDZ150
MARKING
AME8817 AEDZ150 yyww AME8817 AEDZ180 yyww AME8817 AEDZ250 yyww AME8817 AEDZ330 yyww AME8817 AEDZ475 yyww AME8817 AEDZ500 yyww AME8817 BEDZADJ yyww
1.80
AME8817AEDZ180
2.50
AME8817AEDZ250
3.30
AME8817AEDZ330
4.75
AME8817AEDZ475
5.00
AME8817AEDZ500
ADJ
AME8817BEDZADJ
Please consult AME sales office or authorized Rep./Distributor for other output voltages, package types or pin configurations.
2
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n Absolute Maximum Ratings:
Parameter Input Voltage Output Current Output Voltage ESD Classification Maximum 8 Unit V mA V
PD / (VIN - VO)
GND - 0.3 to VIN + 0.3 B
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 (jc ) Internal Power Dissipation (PD ) Maximum Junction Temperature Maximum Lead Temperature ( 10 Sec) ( T = 100oC) Maximum 60 2.7 150 300
o
Unit C/W W
o
C C
o
Caution: Stress above the listed absolute rating may cause permanent damage to the device
3
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n Electrical Specifications
TA = 25 o C unles s otherwis e noted
P a ra m e te r Input V oltage O utput V oltage A c c urac y S ym bol V IN VO IO = 1m A to 1.5A IO = 1500m A V O = V O N O M -2.0% 1.5V < = V O N O M < = 2.0V 2.0V < V O N O M < = 2.8V 2.8V < V O N O M < 3.8V Output Current Current Lim it S hort Circ uit Current Quies c ent Current Ground P in Current IO ILIM ISC IQ IG N D V O > 1.2V V O > 1.2V V O < 0.4V IO = 0m A IO = 1m A to 1.5A IO = 1m A V IN = V O + 1 to V O + 2 V O < 2.0V 4.0V > V O > = 2.0V V o > = 4.0V Load Regulation Over Tem erature S hutdown Over Tem erature Hy s teris is V O Tem perature Coeffic ient RE G LO AD OTS OTH TC f= 1k Hz P ower S upply Rejec tion P S RR IO = 100m A C O = 4.7 F f= 10k Hz f= 100k Hz IO = 100m A C O = 4.7 F f= 1k Hz f= 10k Hz f= 100k Hz Co= 4.7 F Co= 100 F Co= 4.7 F Co= 100 F IO = 1m A to 1500m A -0.15 -0.1 -0.4 0.02 0.2 0.2 150 30 30 50 20 15 75 55 30 30 20 30 20 1 1.223 V I N = 2.7V to 7V V I N = 2.7V to 7V V EN = V I N , V I N = 2.7V to 7V V EN = V O V , V I N = 2.7V to 7V V I N = 5V , V O = 0V , V EN < V EL Note1 Note1 V PG = 7V V O in regulation ISI N K = 500 A 115 1 7 0.4 0.5 2.0 0 1.242 1.261 V in 0.4 0.1 0.5 1 85 m V rm s dB dB 1500 1500 2000 750 35 35 0.15 0.1 0.4 1 1500 50 S ee c hart Te st Condition M in Note 1 -1.5 Typ Max 7 1.5 1000 800 600 mA mA mA A A % % % %
o o
Units V %
Dropout V oltage
V D R OPOU T
mV
Line Regulation
RE G LIN E
C C
ppm / o C
P ower S upply Rejec tion
P S RR
C BY P = 0.01 F f= 10Hz to 100k Hz IO = 10m A ,C BY P = 0 F f= 10Hz to 100k Hz IO = 10m A ,C BY P = 0.01 F
Output V oltage Nois e
eN
Output V oltage Nois e A DJ Input B ias Current A DJ Referenc e V oltage E N Input Thres hold
eN IAD J V R EF V EH V EL IEH IEL ISD VUV V OV ILC V PG V OL
m V rm s mA V V V A A A % V O (N O M) % V O (N O M) mA V V
E N Input B ias Current S hutdown S upply Current Output Under V oltage Output Over V oltage P G Leak age Current P G V oltage Rating P G V oltage Low Note1:V I N (m in) = V O U T+ V D R O P O U T
4
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n Detailed Description
The AME8817 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 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 110oC. The AME8817 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 ohms. 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
When 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 AME8817 includes the Power Good feature. Normally, the PG pin is "Floating", however, when the output is not within 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) Input Voltage too low. 2) During Over-Temperature. 3) During Over-Current. 4) If output is pulled up.
n External Capacitors
The AME8817 is stable with an output capacitor to ground of 4.7F 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. 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 ~ 0.01F. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges.
5
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
Dropout Voltage vs. I LOAD
1.2 1
1.5
1 0.8
1.8 2.0 2.1
Dropout Voltage vs. V OUT
I L O A D =1.5A
Dropout Voltage (V)
0.8 0.6 0.4 0.2 0 0 0.3 0.6 0.9 1.2 1.5
Dropout Voltage (V)
0.6
I L O A D =1.0A
0.4
I L O A D =0.5A
2.8 3.3
0.2 0
1.8
0
2
4
6
8
I LOAD (A)
V O U T (V)
Ground Current vs. Temperature
39 38
I O U T = 1.8mA V O U T = 1.8V V I N = 5V
Ground Current vs. V IN
50 45
Ground Current (A)
Ground Current (A)
37 36 35 34 33 32 31 30 0 50
40 35 30 25 20 15 10
I O U T = 140mA V O U T = 1.5V
100
150
Temperature ( O C)
2
3
4
5
6
7
8
V IN (V)
Ground Current vs. Load Current
38.5 38
Ground Current (A)
37.5 37 36.5 36 35.5 35 34.5 0 0.25 0.5 0.75 1 1.25 1.5
V I N = 2.5V V O U T = 1.5V
Load Current (mA) 6
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
Transient Line Response
VOUT (50mV/DIV)
1.5A CMOS LDO
Load Step 40mA to 1.5A
ILOAD 1A/DIV
0V
Time (20 S/DIV)
VOUT 10mV/DIV
VIN (2V/DIV)
C IN = 4.7F C O U T = 4.7F T R = T F = 1S VOUT = 1.5V
0A C IN = 4.7F C O U T = 4.7F V IN = 4.0V V O U T = 1.8V
Time 500 S/DIV
Current Limit Response
VOUT 1V/DIV
V I N = 5V C I N = 4.7F C O U T = 4.7F
Current Limit Vs. V IN
3 2.8 2.6
C I N = 4.7F C O U T = 4.7F V O U T = 1.8V
Current Limit (A)
2.4 2.2 2 1.8 1.6 1.4 1.2 1 2
0V
ILOAD 1A/DIV
IL I M IS C 0A
Time 1mS/DIV
3
4
5
6
7
8
V IN (V)
Short Circuit Current VS. V IN
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 2 3 4 5 6 7 8
C I N = 4.7F C O U T = 4.7F
Overtemperature Shutdown
IOUT 1A/DIV
Short Circuit Current (A)
0A V I N = 4V C I N = 4.7F C O U T = 4.7F
VOUT 1V/DIV
0V
Time 100mS/DIV 7
V IN (V)
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
10000 1000 100
Stability vs. ESR vs I LOAD
10000
Unstable Region
Stability vs. ESR vs I LOAD
Unstable Region
1000
C L =5 F
100
C L =2 F
ESR ()
10 1 0.1 0.01 0 250
Untested Region 500 750 1000 1250 Stable Region
ESR ()
10 1 0.1
Stable Region
0.01 1500 0 250 500
Untested Region
750
1000
1250
1500
ILOAD (mA)
ILOAD (mA)
Stability vs. ESR vs I LOAD
10000 1000 100
Unstable Region
ESR ()
C L =10F
10 1 0.1
Stable Region
0.01
Untested Region
0.001 0 250 500 750 1000 1250 1500
ILOAD (mA)
8
Analog Microelectronics, Inc.
AME8817
INARY PRELIM
1.5A CMOS LDO
n Package Dimension
TO-263 (DDPAK-7)
MILLIMETERS MIN MAX 10.05 10.31 8.28 8.53 4.31 4.57 0.66 0.91 1.14 1.40 1.27 ref 14.73 15.75 1.40 1.68 0.00 0.25 2.49 2.74 0.43 0.58 2.29 2.79 o 8? 0 2.41 2.67 0.25 INCH ES MIN MAX 0.396 0.406 0.326 0.336 0.170 0.180 0.026 0.036 0.045 0.055 0.050 ref 0.580 0.620 0.000 0.066 0.055 0.010 0.000 0.108 0.098 0.023 0.017 0.110 o 0 8? 0.095 0.105 0.01
SY MBO LS A B C D E G H K L M N P R S W
9
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: 2013-doc-006-0806
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 Dist. Taipei 114, Taiwan, R.O.C. Tel : 886 2 2627-8687 Fax : 886 2 2659-2989

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