AME, Inc.
AME8844
750mA CMOS LDO
n
General Description
The AME8844 family of positive, linear regulators fea-
ture low quiescent current (45µA 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.
An additional feature is a
“Power
Good” detector, which
pulls low when the output is out of regulation.
The AME8844 is stable with an output capacitance of
4.7µF or greater.
n
Functional Block Diagram
(Fixed Versions)
IN
Overcurrent
Shutdown
OUT
Thermal
Shutdown
EN
Vref x115%
PG
R1
AMP
R2
Vref x85%
Vref
n
Features
l
l
l
l
l
l
l
l
l
l
l
l
l
l
Very Low Dropout Voltage
Guaranteed 750mA Output
Accurate to within 1.5%
45µA Quiescent Current Typically
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Noise Reduction Bypass Capacitor (Fixed
Versions)
Power-Saving Shutdown Mode
Space-Saving MSOP-8 Package
6 Factory Pre-set Output Voltages
Low Temperature Coefficient
Adjustable Version
Power Good Output Function.
GND
n
Functional Block Diagram
(Adjustable Version)
IN
OUT
Overcurrent
Shutdown
Thermal
Shutdown
AMP
R1
EN
ADJ
(external)
1.242V
R2
(external)
GND
n
Typical Applications
IN
IN
OUT
n
Applications
l
l
l
l
l
Instrumentation
Portable Electronics
Wireless Devices
PC Peripherals
Battery Powered Widgets
OUT
AME8844
PG
GND
EN
C1
5V
1µF
µ
C3
4.7µF
µ
1
AME, Inc.
AME8844
750mA CMOS LDO
n
Pin Configuration
MSOP-8
Top View
8
7
6
5
MSOP-8
Top View
AME 8844AEQAxxx
1. EN
2. V
IN
3. PG
4. V
OUT
5. GND
6. GND
7. GND
8. GND
8
7
6
5
AME 8844BEQAADJ
1. EN
2. V
IN
3. ADJ
4. V
OUT
5. GND
6. GND
7. GND
8. GND
8844
Xyww
8844
Byww
1
2
3
4
1
2
3
4
Note:
X: represents the regulator output voltage.
yww: represents the date code.
Please contact AME for details.
n
Ordering Information
AME8844 AEQA xxx
Voltage
150: V=1.5V
180: V=1.8V
250: V=2.5V
330: V=3.3V
Pin Out Types
[Package Type]
Q:MSOP-8
[Pin Count]
A:8
AME8844 BEQA ADJ
Voltage
ADJ: Adjustable
Pin Out Types
[Package Type]
Q:MSOP-8
[Pin Count]
A:8
Operating
Temperature
E:-40
o
C to 85
o
C
Operating
Temperature
E:-40
o
C to 85
o
C
2
AME, Inc.
AME8844
750mA CMOS LDO
n
Ordering Information (contd.)
Part Number
AME8844AEQA150
Marking
8844
Lyww
8844
Myww
8844
Dyww
8844
Ayww
8844
Byww
Output Voltage
1.50
Package
MSOP-8
Operating Temp. Range
- 40
o
C to + 85
o
C
AME8844AEQA180
1.80
MSOP-8
- 40
o
C to + 85
o
C
AME8844AEQA250
2.50
MSOP-8
- 40
o
C to + 85
o
C
AME8844AEQA330
3.30
MSOP-8
- 40
o
C to + 85
o
C
AME8844BEQAADJ
ADJ
MSOP-8
- 40
o
C to + 85
o
C
Note: ww represents the date code
Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
3
AME, Inc.
AME8844
750mA CMOS LDO
n
Absolute Maximum Ratings
Parameter
Input Voltage
Output Current
Output Voltage
ESD Classification
Maximum
8
Unit
V
mA
V
P
D
/ (V
IN
- V
O
)
GND - 0.3 to V
IN
+ 0.3
B
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
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 (
θ
jc
)
Internal Power Dissipation (P
D
)
(
∆
T = 100
o
C)*
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
MSOP-8
MSOP-8
150
300
Maximum
80
Unit
o
C/W
W
o
C
C
o
* Assuming a heat sink capable of twice times (θjc)
** Estimated
4
AME, Inc.
AME8844
750mA CMOS LDO
n
Electrical Specifications
V
IN
= V
O(NOM)
+2V, V
EN
= V
IN
, TA = 25
O
C unless otherwise noted
Parameter
Input Voltage
Output Voltage Accuracy
Dropout Voltage
Output Current
Current Limit
Short Circuit Current
Quiescent Current
Ground Pin Current
Line Regulation
Load Regulation
Over Temerature Shutdown
Over Temerature Hysterisis
V
O
Temperature Coefficient
ADJ Input Bias Current
Minimum Load Current
ADJ Reference Voltage
Power Supply Rejection
Symbol
V
IN
V
O
V
DROPOUT
I
O
I
LIM
I
SC
I
Q
I
GND
REG
LINE
REG
LOAD
OTS
OTH
TC
I
ADJ
I
load
V
REF
PSRR
I
O
=100mA
C
O
=4.7
µ
F ceramic
f=10Hz to 100kHz
I
O
=10mA
I
O
=750mA
Test Condition
I
O
=1mA
V
O(NOM)
=1.5V
V
O(NOM)
=1.8V
V
O
=V
ONOM
-2.0%
V
O(NOM)
>=2.0V
V
O
>1.2V
V
O
>1.2V
V
IN
=V
O(NOM)
+1V, V
O
< 0.4V
I
O
=0mA
I
O
=1mA to 750mA
V
O
< 2.0V
I
O
=1mA
4.0 > V
O
>= 2.0V
V
IN
=V
O
+1 to V
O
+2
4.0V <= V
O
I
O
=1mA to 750mA
Min
Note 1
-1.5
Typ
Max
Units
V
%
mV
mA
mA
mA
µ
A
µ
A
%
%
%
%
C
o
C
ppm/
o
C
µ
A
µ
A
V
dB
o
7
1.5
1000
See
650
chart
500
750
750
750
45
45
-0.15
-0.1
-0.4
-1
70
Vin = 2.5V
f=1kHz
f=10kHz
f=100kHz
Co=4.7
µ
F
0.15
0.02 0.1
0.4
0.2
1
150
30
30
1
70
1.221 1.240 1.26
75
55
30
30
2.0
0
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
Shutdown Supply Current
Output Under Voltage
Output Over Voltage
PG Leakage Current
PG Voltage Low
eN
V
EH
V
EL
I
EH
I
EL
I
SD
V
UV
V
OV
I
LC
µ
Vrms
Vin
V
0.4
V
1
µ
A
1
µ
A
2
µ
A
84 %V
O(NOM)
%V
O(NOM)
1
µ
A
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
<V
EL
PG goes Low when V
OUT
too Low
PG goes Low when V
OUT
too High
V
PG
=7V
0.5
105
V
OL
I
SINK
=0.25mA
0.4
V
Note1:V
IN(min)
=V
OUT
+V
DROPOUT
5
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
