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PDF AME8845 Data sheet ( Hoja de datos )
| Número de pieza | AME8845 | |
| Descripción | 3A CMOS LDO | |
| Fabricantes | Analog Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AME8845 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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AME, Inc.
AME8845
n General Description
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
www.DataSheeint4UT.Oco-m252, 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.
n Features
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
3A CMOS LDO
n Functional Block Diagram
IN OUT
Overcurrent
Shutdown
Thermal
Shutdown
EN
AMP
R1
R2
Vref
GND
n Typical Application
VIN
0.1µ F
IN SENSE
EN AME8845 OUT
GND
2.2µF
n Applications
l Instrumentation
l Portable Electronics
l Wireless Devices
l PC Peripherals
l Battery Powered Widgets
1
1 page  
AME, Inc.
AME8845
3A CMOS LDO
n Ordering Information
Part Number
www.DataSheet4U.coAmME8845AEBT150
AME8845AEBT150Z
AME8845BEBT150
AME8845BEBT150Z
AME8845AEDT150
AME8845AEDT150Z
AME8845BEDT150
AME8845BEDT150Z
AME8845AEDV150
AME8845AEDV150Z
AME8845AEBT180
AME8845AEBT180Z
AME8845BEBT180
Marking*
AME8845
AEBT150
yyww
AME8845
AEBT150
yyww
AME8845
BEBT150
yyww
AME8845
BEBT150
yyww
AME8845
AEDT150
yyww
AME8845
AEDT150
yyww
AME8845
BEDT150
yyww
AME8845
BEDT150
yyww
AME8845
AEDV150
yyww
AME8845
AEDV150
yyww
AME8845
AEBT180
yyww
AME8845
AEBT180
yyww
AME8845
BEBT180
yyww
Output Voltage Package Operating Temp. Range
1.50
TO-220
- 40oC to + 85oC
1.50
TO-220
- 40oC to + 85oC
1.50
TO-220
- 40oC to + 85oC
1.50
TO-220
- 40oC to + 85oC
1.50
TO-263-3
- 40oC to + 85oC
1.50
TO-263-3
- 40oC to + 85oC
1.50
TO-263-3
- 40oC to + 85oC
1.50
TO-263-3
- 40oC to + 85oC
1.50
TO-263-5
- 40oC to + 85oC
1.50
TO-263-5
- 40oC to + 85oC
1.80
TO-220
- 40oC to + 85oC
1.80
TO-220
- 40oC to + 85oC
1.80
TO-220
- 40oC to + 85oC
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.
5
5 Page 
AME, Inc.
AME8845
n Detailed Description
The AME8845 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
www.DataSheet4U.com
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.
3A CMOS LDO
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.
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AME8845.PDF ] | |
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