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GE1084 の電気的特性と機能

GE1084のメーカーはGTMです、この部品の機能は「5A Low Dropout Positive Adjustable」です。


製品の詳細 ( Datasheet PDF )

部品番号 GE1084
部品説明 5A Low Dropout Positive Adjustable
メーカ GTM
ロゴ GTM ロゴ 




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GE1084 Datasheet, GE1084 PDF,ピン配置, 機能
www.DataSheet4U.com
ISSUED DATE :2003/08/01
REVISED DATE :2006/03/29D
GE1084
5A Low Dropout Positive Adjustable or Fixed-Mode Regulator
Description
The GE1084 is a low dropout positive adjustable or fixed mode regulator with minimum of 5.0A 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. GE1084 is also well suited for other
applications such as VGA cards. GE1084 is guaranteed to have lower than 1.5V 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.
Features
1.5V 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 Dimensions
Typical Circuit
REF.
A
b
c
D
E
L4
L5
Millimeter
Min. Max.
4.40 4.80
0.76 1.00
0.36 0.50
8.60 9.00
9.80 10.4
14.7 15.3
6.20 6.60
REF.
c1
b1
L
e
L1
Ø
A1
Block Diagram
Millimeter
Min. Max.
1.25 1.45
1.17 1.47
13.25 14.25
2.54 REF.
2.60 2.89
3.71 3.96
2.60 2.80
Pin Descriptions
Name
I/O
Adj (GND)
Vout
O
Vin I
PIN#
1
2
3
FUNCTION
Adjustable (Ground only for fixed mode)
The output of the regulator. A minimum of 10uF capacitor must be connected from this pin to
ground to insure stability.
The input pin of regulator .Typically a large storage capacitor is connected from this pin to ground
to insure that the input voltage does not sag below the minimum dropout voltage during the load
transient response .This pin must always be 1.5V higher than Vout in order for the device to
regulate properly.
GE1084
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GE1084 pdf, ピン配列
ISSUED DATE :2003/08/01
REVISED DATE :2006/03/29D
Functional Description
Introduction
The GE1084 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 2.5V. The GE1084 only needs 1.5V
differential between Vin and Vout to maintain output regulation, the output voltage tolerances are also extremely tight and
they include the transient response as port of the specification. For example, Intel VRE specification calls for a total of
+/-100mV including initial tolerance, load regulation and 0 to 5.0A load step. The GE1084 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 GE1084 can be programmed to any voltages in the range of 1.25V to 5V with the addition of R1 and R2 external
resistors According to the following formula:
The GE1084 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 requirement of the GE1084 is 10mA, R1 is typically
selected to be 121 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=121 and R2=200 the
error due to Iadj is only 0.3% of the nominal set point.
Load Regulation
Since the GE1084 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 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 GE1084 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 GE1084 incorporates an internal shutdown that protects the device when the junction temperature exceeds the
maximum allowable junction temperatures. Although this device can operate with junction temperatures in the range of
150 , 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.
GE1084
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共有リンク

Link :


部品番号部品説明メーカ
GE1084

5A Low Dropout Positive Adjustable

GTM
GTM
GE1085

3A Low Dropout Positive Adjustable

GTM
GTM
GE1086

1.5A Low Dropout Positive Adjustable

GTM
GTM


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