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PDF APE1085 Data sheet ( Hoja de datos )
| Número de pieza | APE1085 | |
| Descripción | 3A Low Dropout Positive Adjustable or Fixed-Mode Regulator | |
| Fabricantes | Advanced Power Electronics | |
| Logotipo |  |
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Advanced Power
APE1085
Electronics Corp.
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
1. Features
General Description
• 1.4V maximum dropout at full load current
• Built-in thermal shutdown
• Output current limiting
• Adjustable output voltage or fixed 1.5V, 1.8V, 2.5V,
3.3V, 5.0V
• Fast transient response
• Good noise rejection
• Package : TO252, TO263, TO220
• RoHS Compliant
APE1085 is a low dropout positive adjustable or
fixed-mode regulator with minimum of 3.0A output
current capability. The product is specifically
designed to provide well-regulated supply for low
voltage IC applications such as high-speed bus
termination and low current 3.3V logic supply.
APE1085 is also well suited for other applications
such as VGA cards. APE1085 is guaranteed to have
lower than 1.4V dropout at full load current making it
ideal to provide well-regulated outputs of 1.25 to
3.3V with 4.7 to 12V input supply.
Ordering Information
APE 1085 X XX
Low Dropout Regulator
Package
Vout
H : TO252-3L
S : TO263-3L
P : TO220-3L
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Block Diagram
Vin 3
Thermal
Shutdown
2 Vout
+
+－
CURRENT
LIMIT
1.25V +
+
1 Adj
This datasheet contains new product information. Advanced Power Electronics Corp. reserves the rights to modify the product specification without notice. No liability is assumed as
a result of the use of this product. No rights under any patent accompany the sale of the product.
200313072-1/10
1 page  
Advanced Power
Electronics Corp.
www.DataSheet4U.com
APE1085
Pb Free Plating Product
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Functional Description
Introduction
The APE1085 adjustable Low Dropout (LDO) regulator
is a 3 terminal device that can easily be programmed
with the addition of two external resistors to any
voltages within the range of 1.25V to Vin-1.4V. The
APE1085 only needs 1.4V differential between Vin
and Vout to maintain output regulation. In addition, the
output voltage tolerances are also extremely tight and
they include the transient response as part of the
specification. For example, Intel VRE specification
calls for a total of +/- 100mV including initial tolerance,
load regulation and 0 to 3.0A load step.
The APE1085 is specifically designed to meet the fast
current transient needs as well as providing an
accurate initial voltage, reducing the overall system
cost with the need for fewer output capacitors.
Output Voltage Setting
The APE1085 can be programmed to any voltages in
the range of 1.25V to Vin-1.4V with the addition of R1
and R2 external resistors according to the following
formula:
Vout = Vref (1+ R2/R1) +Iadj *R2 , where Vref = 1.25 typically, Iadj =
55uA typically R1&R2 as shown at below
Vin AAPPEE11008845
Vout
Adj Vref R1
Iadj=55uA
R2
The APE1085 keeps a constant 1.25V between the
output pin and the adjust pin. By placing a resistor R1
across these two pins a constant current flows through
R1, adding to the Iadj current and into the R2 resistor
producing a voltage equal to the (1.25/R1)*R2+Iadj*R2
which will be added to the 1.25V to set the output
voltage. This is summarized in the above equation.
Since the minimum load current requirement of the
APE1085 is 10mA, R1 is typically selected to be 121Ω
resistor so that it automatically satisfies the minimum
current requirement. Notice that since Iadj is typically
in the range of 55uA it only adds a small error to the
output voltage and should only be considered when a
very precise output voltage setting is required. For
example, in a typical 3.3V application where R1=121Ω
and R2=200Ω the error due to Iadj is only 0.3% of the
nominal set point.
Load Regulation
Since the APE1085 is only a 3 terminal device, it is not
possible to provide true remote sensing of the output
voltage at the load. The best load regulation is
achieved when the bottom side of R2 is connected to
the load and the top-side of R1 resistor is connected
directly to the case or the Vout pin of the regulator and
not to the load. It is important to note that for high
current applications, this can re-present a significant
percentage of
Advanced Power Electronics Corp.
www.a-power.com.tw
the overall load regulation and one must keep the path
from the regulator to the load as short as possible to
minimize this effect.
Stability
The APE1085 requires the use of an output capacitor
as part of the frequency compensation in order to
make the regulator stable. For most applications a
minimum of 10uF aluminum electrolytic capacitor
insures both stability and good transient response.
Thermal Design
The APE1085 incorporates an internal thermal
shutdown that protects the device when the junction
temperature exceeds the maximum allowable junction
temperature. Although this device can operate with
junction temperatures in the range of 150oC, it is
recommended that the selected heat sink be chosen
such that during maximum continuous load operation
the junction temperature is kept below the temperature.
Layout Consideration
The output capacitors must be located as close to the
Vout terminal of the device as possible. It is
recommended to use a section of a layer of the PC
board as a plane to connect the Vout pin to the output
capacitors to prevent any high frequency oscillation
that may result due to excessive trace inductance.
5/10
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet APE1085.PDF ] | |
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