AME, Inc.
1
AME8845
3A CMOS LDO
n Typical Application
n Functional Block Diagram
l Very Low Dropout Voltage
l Guaranteed 3A Output
l Accurate to within 1.5%
l 100µA Quiescent Current Typically
l Over-Temperature Shutdown
l Current Limiting
l Short Circuit Current Fold-back
l Space-Saving TO-252, SOT-223, TO-263
and TO-220 Package
l Low Temperature Coefficient
The AME8845 family of linear regulators feature low
quiescent current (100µA typ.) with low dropout voltage,
making them ideal for battery applications. It is available
in TO-252, SOT-223, TO-263 and TO-220 packages. The
space-efficient TO-252, SOT-223 package is attractive for
"Pocket" and "Hand Held" 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.
The AME8845 is stable with an output capacitance of
2.2µF or greater.
l Instrumentation
l Portable Electronics
l Wireless Devices
l PC Peripherals
l Battery Powered Widgets
n General Description
n Features
n Applications
2.2µF
AME8845
VIN IN
GND
OUT
EN
SENSE
0.1µF
GND
OUT
IN
Overcurrent
Shutdown
Thermal
Shutdown
EN
Vref
AMP
R1
R2
-
+
AME, Inc.
2
3A CMOS LDO
AME8845
n Pin Configuration
TO-252-2
Top View
TO-252-2
Top View
AME 8845AECSxxx
1. VIN
2. GND (heat sink)
3. VOUT
AME 8845BECSxxx
1. GND
2. VOUT (heat sink)
3. VIN
13
2
AME8845
13
2
AME8845
SOT-223
Top View
1 32
AME8845
TO-220
Top View
AMExxxx
1
AME8845
2 3
AME 8845AEBTxxx
1. VIN
2. GND (heat sink)
3. VOUT
TO-220
Top View
AME 8845BEBTxxx
1. GND
2. VOUT (heat sink)
3. VIN
AMExxxx
1
AME8845
2 3
SOT-223
Top View
1 32
AME8845
AME8845AEGTxxx
1. VIN
2. GND
3. VOUT
AME8845BEGTxxx
1. GND
2. VOUT
3. VIN
AME, Inc.
3
AME8845 3A CMOS LDO
n Pin Configuration
TO-263-3L
Top View
132
AME8845
AME 8845AEDTxxx
1. VIN
2. GND (heat sink)
3. VOUT
TO-263-3L
Top View
132
AME8845
AME 8845BEDTxxx
1. GND (heat sink)
2. VOUT
3. VIN
TO-263-5L
Top View
1 32
AME8845
4 5
AME 8845AEDVxxx
1. VIN
2. EN
3. GND (heat sink)
4. SENSE
5. VOUT
AME, Inc.
4
3A CMOS LDO
AME8845
n Ordering Information
AME8845 x x x x xxx x
Voltage
Number of Pin
Package
Operating Temperature
Pin Configuration
Special Feature
A:
1. VIN
E:
-40
O
C to 85
O
C
B:
TO-220
S:
2
150:
V=1.5V
Z:
Lead Free
(TO-252)
2. GND
C:
TO-252
T:
3
180:
V=1.8V
3. VOUT
D:
TO-263
V:
5
250:
V=2.5V
B:
1. GND
2. VOUT
3. VIN
A:
1. VIN
(TO-263-3)
2. GND
3. VOUT
B:
1. GND
2. VOUT
3. VIN
A:
1. VIN
(TO-263-5)
2. EN
3. GND
4. SENSE
5. VOUT
A:
1. VIN
(TO-220)
2. GND
3. VOUT
B:
1. GND
2. VOUT
3. VIN
A:
1. VIN
(SOT-223)
2. GND
3. VOUT
B:
1. VIN
(SOT-223)
2. GND
3. VOUT
Special Feature
G:
Pin
Configuration Voltage
Operating
Temperature
Range Package Type Number
of
Pins
SOT-223 330: V=3.3V
Pin Configuration
AME, Inc.
5
AME8845
3A CMOS LDO
n Ordering Information
Note: yyww/ yww represents the date code
* A line on top of the first letter represents lead free plating such as AME8845
Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
Part Number Marking* Output Voltage Package Operating Temp. Range
AME8845AEBT150 AME8845
AEBT150
yyww 1.50 TO-220 - 40oC to + 85oC
AME8845AEBT150Z AME8845
AEBT150
yyww 1.50 TO-220 - 40oC to + 85oC
AME8845BEBT150 AME8845
BEBT150
yyww 1.50 TO-220 - 40oC to + 85oC
AME8845BEBT150Z AME8845
BEBT150
yyww 1.50 TO-220 - 40oC to + 85oC
AME8845AEDT150 AME8845
AEDT150
yyww 1.50 TO-263-3 - 40oC to + 85oC
AME8845AEDT150Z AME8845
AEDT150
yyww 1.50 TO-263-3 - 40oC to + 85oC
AME8845BEDT150 AME8845
BEDT150
yyww 1.50 TO-263-3 - 40oC to + 85oC
AME8845BEDT150Z AME8845
BEDT150
yyww 1.50 TO-263-3 - 40oC to + 85oC
AME8845AEDV150 AME8845
AEDV150
yyww 1.50 TO-263-5 - 40oC to + 85oC
AME8845AEDV150Z AME8845
AEDV150
yyww 1.50 TO-263-5 - 40oC to + 85oC
AME8845AEBT180 AME8845
AEBT180
yyww 1.80 TO-220 - 40oC to + 85oC
AME8845AEBT180Z AME8845
AEBT180
yyww 1.80 TO-220 - 40oC to + 85oC
AME8845BEBT180 AME8845
BEBT180
yyww 1.80 TO-220 - 40oC to + 85oC
AME, Inc.
6
3A CMOS LDO
AME8845
n Ordering Information
Part Number Marking* Output Voltage Package Operating Temp. Range
AME8845BEBT180Z AME8845
BEBT180
yyww 1.80 TO-220 - 40oC to + 85oC
AME8845AEDT180 AME8845
AEDT180
yyww 1.80 TO-263-3 - 40oC to + 85oC
AME8845AEDT180Z AME8845
AEDT180
yyww 1.80 TO-263-3 - 40oC to + 85oC
AME8845BEDT180 AME8845
BEDT180
yyww 1.80 TO-263-3 - 40oC to + 85oC
AME8845BEDT180Z AME8845
BEDT180
yyww 1.80 TO-263-3 - 40oC to + 85oC
AME8845AEDV180 AME8845
AEDV180
yyww 1.80 TO-263-5 - 40oC to + 85oC
AME8845AEDV180Z AME8845
AEDV180
yyww 1.80 TO-263-5 - 40oC to + 85oC
AME8845AEGT180 BAZyww 1.80 SOT-223 - 40oC to + 85oC
AME8845AEGT180Z BAZyww 1.80 SOT-223 - 40oC to + 85oC
AME8845AEBT250 AME8845
AEBT250
yyww 2.50 TO-220 - 40oC to + 85oC
AME8845AEBT250Z AME8845
AEBT250
yyww 2.50 TO-220 - 40oC to + 85oC
AME8845BEBT250 AME8845
BEBT250
yyww 2.50 TO-220 - 40oC to + 85oC
AME8845BEBT250Z AME8845
BEBT250
yyww 2.50 TO-220 - 40oC to + 85oC
AME8845AEDT250 AME8845
AEDT250
yyww 2.50 TO-263-3 - 40oC to + 85oC
AME8845AEDT250Z AME8845
AEDT250
yyww 2.50 TO-263-3 - 40oC to + 85oC
AME, Inc.
7
AME8845
3A CMOS LDO
n Ordering Information
Part Number Marking* Output Voltage Package Operating Temp. Range
AME8845BEDT250 AME8845
BEDT250
yyww 2.50 TO-263-3 - 40oC to + 85oC
AME8845BEDT250Z AME8845
BEDT250
yyww 2.50 TO-263-3 - 40oC to + 85oC
AME8845AEDV250 AME8845
AEDV250
yyww 2.50 TO-263-5 - 40oC to + 85oC
AME8845AEDV250Z AME8845
AEDV250
yyww 2.50 TO-263-5 - 40oC to + 85oC
AME8845AEGT250 AZSyww 2.50 SOT-223 - 40oC to + 85oC
AME8845AEGT250Z AZSyww 2.50 SOT-223 - 40oC to + 85oC
AME8845AEBT330 AME8845
AEBT330
yyww 3.30 TO-220 - 40oC to + 85oC
AME8845AEBT330Z AME8845
AEBT330
yyww 3.30 TO-220 - 40oC to + 85oC
AME8845BEBT330 AME8845
BEBT330
yyww 3.30 TO-220 - 40oC to + 85oC
AME8845BEBT330Z AME8845
BEBT330
yyww 3.30 TO-220 - 40oC to + 85oC
AME8845AEDT330 AME8845
AEDT330
yyww 3.30 TO-263-3 - 40oC to + 85oC
AME8845AEDT330Z AME8845
AEDT330
yyww 3.30 TO-263-3 - 40oC to + 85oC
AME8845BEDT330 AME8845
BEDT330
yyww 3.30 TO-263-3 - 40oC to + 85oC
AME8845BEDT330Z AME8845
BEDT150
yyww 3.30 TO-263-3 - 40oC to + 85oC
AME8845AEDV330Z AME8845
AEDV330
yyww 3.30 TO-263-5 - 40oC to + 85oC
AME8845AEDV330Z AME8845
AEDV330
yyww 3.30 TO-263-5 - 40oC to + 85oC
AME, Inc.
8
3A CMOS LDO
AME8845
Parameter Rating Unit
Ambient Temperature Range - 40 to + 85 oC
Junction Temperature - 40 to + 125 oC
n Absolute Maximum Ratings
n Recommended Operating Conditions
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
Parameter Maximum Unit
Input Voltage 7V
Output Current PD / (VIN - VO)mA
Output Voltage GND - 0.3 to VIN + 0.3 V
ESD Classification B
AME, Inc.
9
AME8845
3A CMOS LDO
n Thermal Information
Unit
TO-252
TO-263
TO-220
SOT-223
Conductive 7
Non-Conductive 30
Conductive 7
Non-Conductive 27
Conductive 7
Non-Conductive 24
Conductive 7
Non-Conductive 31
TO-252
TO-263
TO-220
SOT-223
oC
oC
625
150
300
160
1200
2800
3000
Maximum
90
60
50
Maximum Lead Temperature (10 Sec)
oC / W
mW
Thermal Resistance (θjc)
TO-252
TO-263
TO-220
SOT-223
oC / W
Parameter
Maximum Junction Temperature
Thermal Resistance (θja)
Internal Power Dissipation (PD)
(∆T = 100oC)
AME, Inc.
10
3A CMOS LDO
AME8845
Parameter Symbol Min Typ Max Units
Input Voltage VIN Note 1 6V
Output Voltage Accuracy VO-1.5 1.5 %
1.5V<=VO(NOM)<=1.8V 1200
1.8V<VO(NOM)<2.5V 700
2.5V<=VO(NOM) 300 450
Output Current IO3000 mA
Current Limit ILIM 3A
Short Circuit Current ISC 1.7 A
Quiescent Current IQ200 350 µA
Ground Pin Current IGND 300 µA
Line Regulation REGLINE -0.2 0.1 0.2 %
Load Regulation REGLOAD -1 1%
Over Temperature Shutdown OTS 140 oC
Over Temperature Hysterisis OTH 30 oC
VO Temperature Coefficient TC 30 ppm/oC
f=100Hz 70
f=1kHz 50
VEH VIN*0.8 VIN
VEL 00.4
IEH 2
IEL 2
Shutdown Current ISD 10 µA
IO=0mA
IO=1mA to 3A
IO=100mA
CO=10µF
f=10Hz to 100kHz
IO=10mA Co=2.2µF
IO=1mA, VIN=VO+1 to VO+2
Test Condition
Power Supply Rejection
Output Voltage Noise eN
Dropout Voltage VDROPOUT
µVrms
IO=1mA
IO=3A
VO=VO(NOM) -2.0%
30
VO>1.2V
VO>1.2V
VIN= VO(NOM)+1V, VO<0.4V
dBPSRR
mV
IO=1mA to 3A
VEN=0V, VIN=5V
EN Input Threshold VIN=VIN,MIN to VIN, MAX V
EN Input Leakage µA
VEN=VIN=5V
VEN=0V, VIN=5V
n Electrical Specifications
VIN = VO(Nom) +1V, CIN=0.1µF, COUT=2.2µF, TA = 25OC unless otherwise noted
Note1:VIN(min)=VOUT+VDROPOUT
AME, Inc.
11
AME8845
3A CMOS LDO
The AME8845 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 ampli-
fier compares the output voltage to a precision reference.
Over-current and Thermal shutdown circuits become ac-
tive when the junction temperature exceeds 140oC, or
the current exceeds 4.5A. During thermal shutdown, the
output voltage remains low. Normal operation is restored
when the junction temperature drops below 110oC.
The AME8845 behaves like a current source when the
load reaches 4.5A. 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.
n Detailed Description n External Capacitors
The AME8845 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. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response. Unfortu-
nately, 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 in-
put 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.
AME, Inc.
12
3A CMOS LDO
AME8845
2.4
2.44
2.48
2.52
2.56
2.6
-45 -35 -25-15 -5 515 25 35 45 55 65 75 85 95 105115125
Temperature (oC)
Output Voiltage (V)
250
270
290
310
330
350
370
-45 -35 -25-15 -5 5 15 25 35 45 55 65 75 85 95 105 115125
Temperature (oC)
Quiescent Current @ 5V (uA)
0
50
100
150
200
250
300
350
400
450
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Supply Voltage (V)
Quiescent Current (uA)
125oC
85oC
55oC
25oC-5oC
-45oC
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
-40-30 -20 -10 0 10 20 25 30 40 50 60 70 80 90100 110125
Temperature(oC)
Current Limit (A)
Temperature Stability
Quiescent Current vs.Temperature
Quiescent Current vs. Supply Voltage
Dropout Voltage vs. Load Current
Dropout Voltage vs. Temperature
Current Limit vs. Temperature
0
50
100
150
200
250
300
350
400
450
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Load Current (A)
Dropout Voltage (mV)
-45oC-5oC25oC
55oC
85oC
125oC
VOUT=2.5V
150
200
250
300
350
400
450
-45 -35 -25 -15 -5 515 25 35 45 55 65 75 85 95 105115125
Temperature (oC)
Dropout Voltage @ 3A (mV)
VOUT=2.5V
AME, Inc.
13
AME8845
3A CMOS LDO
Output Voltage(2.5V) vs. Input Voltage
PSRR vs. Frequency
Load Regulation Deviation
0
50
100
150
200
250
300
350
0.0 0.5 1.0 1.5 2.0 2.5 3.0
IQ(uA)
Vout = 3.3V
Cin= 0.1 μF(ceramic)
Cout= 2.2 μF(ceramic)
Vin= Vo+1.0V
Load Current (A)
Ground Current (mA)
Output Noise vs. Frequency
Ground Current vs. Load Current
-45C
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0123456
Input Voltage (V)
Output Voltage (V)
125 oC
55 oC
-5 oC
25 oC
-45 oC
85 oC
-0.06
-0.04
-0.02
0.00
0.04
0.06
0.08
0.10
0.14
0.16
-40-30 -20 -10 0 10 20 25 30 40 50 60 70 80 90100 110125
Temperature(oC)
Output Voltage Deviation (%)
0.12
0.02
VOUT=2.5V
CIN=3.3µF (Ceramic)
COUT=3.3µF (Ceramic)
∆IL=3A
-80
-70
-60
-50
-40
-30
-20
1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06
Frequency (Hz)
PSRR (dB)
VIN=5V ILOAD=100mA
CL=10µF VOUT=3.3V
0
5
10
15
20
25
10 100 1000 10000 100000
Frequency (HZ)
Output Noise (uV)
VIN=5V VIL=100mA
CL=10µF VOUT=3.3V
AME, Inc.
14
3A CMOS LDO
AME8845
Li
Line Transient Response
Load Transient Response
Time (20μS/DIV)
Input
Voltage(V)Output Voltage
Deviation(mV)
100
50
0
5.3
4.3
Cin= 0 Cout= 4.7 μF(ceramic)
Vout = 3.3V Vin= 5.3V~4.3V
=25oCILOAD =1mA
TA
Time (500μS/DIV)
Load
Current(A)Output Voltage
Deviation(mV)
100
50
0
3
0.1
Cin= 0.1 μF(ceramic) Cout= 10uF(Tantalum)
Vout = 3.3V Vin= 5.3V~4.3V
=25oCILOAD:100mA--->3A
TA
AME, Inc.
15
AME8845
3A CMOS LDO
n Package Dimension
TO-263-3
MIN MAX MIN MAX
A9.65 10.42 0.380 0.410
B8.28 9.66 0.326 0.380
C4.06 4.83 0.160 0.190
D0.50 1.02 0.020 0.040
E1.14 1.40 0.045 0.055
G
H14.60 15.60 0.5748 0.61417
K0.99 2.93 0.03898 0.11535
N
P2.28 2.80 0.08976 0.11024
R0o8o0o8o
0.381REF 0.015REF
*2.54 *0.100
SYMBOLS MILLIMETERS INCHES
G
Top View Side View
Front View
C
D
H
A
BK
R
E
P
N
TO-263-5
D
Front View
W
Top View Side View
C
G
H
A
BK
R
E
P
N
MIN MAX MIN MAX
A10.050 10.668 0.396 0.420
B8.280 9.169 0.326 0.361
C4.310 4.597 0.170 0.181
D0.660 0.910 0.026 0.036
E1.140 1.400 0.045 0.055
G
H14.605 15.875 0.575 0.625
K1.143 1.680 0.045 0.066
L0.000 0.305 0.000 0.012
N0.330 0.580 0.013 0.023
P2.280 2.800 0.090 0.110
R0o8o0o8o
W
1.70REF 0.067 REF
0.25REF 0.01REF
SYMBOLS MILLIMETERS INCHES
AME, Inc.
16
3A CMOS LDO
AME8845
MIN MAX MIN MAX
A0.45 0.58 0.0177 0.0230
B1.60 1.95 0.0630 0.0768
C0.51 1.50 0.0201 0.0591
D0.45 0.60 0.0177 0.0236
E6.40 6.80 0.2520 0.2677
F5.40 7.20 0.2126 0.2835
G2.20 2.85 0.0866 0.1122
H-* 2.30 -* 0.0906
J-0.97 -0.0380
K5.20 5.50 0.2047 0.2165
L1.40REF 0.055REF
SYMBOLS MILLIMETERS INCHES
n Package Dimension
TO-252(DPAK)-EIAJ
*: Typical Value
Notes:
1. Controlling dimension: Millimeters.
2. Maximum lead thickness includes lead finish thickness Mini-
mum lead thickness is the minimum thickness of base material.
CG
F
L
Top View Side View
E
KBA
D
H
J
SOT-223
C
13o(4X)
Top View Side View
θ
D
B1
HE
e
A1 B
13o(4X)
Front View
F
MIN MAX MIN MAX
A10.02 0.10 0.0008 0.0039
B0.60 0.84 0.0236 0.0330
B12.90 3.15 0.1140 0.1240
C0.24 0.38 0.0094 0.0150
D6.30 6.71 0.2480 0.2640
E3.30 3.71 0.1299 0.1460
e
H6.70 7.30 0.2638 0.2874
?0o10o0o10o
F1.40 1.80 0.0560 0.0702
2.30 BSC 0.0906 BSC
MILLIMETERS INCHES
SYMBOLS
AME, Inc.
17
AME8845
3A CMOS LDO
TO-220
n Package Dimension
Top View
Side View
G
I
P
O
M
N
K
D
E
C
A
MIN MAX MIN MAX
A5.58 7.49 0.2197 0.2949
C 3.55 4.83 0.1398 0.1900
D0.50 1.40 0.0197 0.0550
E0.30 1.15 0.0118 0.0453
G9.65 10.67 0.3799 0.4200
I3.53 4.09 0.1390 0.1610
K0.50 1.15 0.0197 0.0453
M1.14 1.78 0.0449 0.0700
N2.28 2.80 0.0898 0.1102
O12.70 14.74 0.5000 0.5803
P14.22 16.51 0.5600 0.6500
SYMBOLS MILLIMETERS INCHES
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, 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.
AME, Inc. , September 2003
Document: 2006-DS8803/8814-G
E-Mail:Longman@rccn.com.cn
Address:Room 2101, No.2 Building Yulan garden, No.50 Puhuitang Rd,Shanghai,PRC
zip:200030
Tel : 86-21-64285731/32 ext:8033 Sales Manager:Longman Xu
Fax: 86-21-64393342
