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PDF AX1084 Data sheet ( Hoja de datos )
| Número de pieza | AX1084 | |
| Descripción | 5A Low Dropout Linear Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX1084
5A Low Dropout Linear Regulator
GENERAL DESCRIPTION
AX1084 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. AX1084 is also well suited for other applications such as VGA cards.
AX1084 is guaranteed to have lower than 1.5V dropout at full load current making it ideal to
provide well-regulated outputs of 1.25V to 3.3V with 4.8V to 12V input supply.
FEATURES
- 1.5V maximum dropout at full load current
- Built-in thermal shutdown
- Output current limiting
- Adjustable and 1.5V/1.8V/2.5V/3.3V/5.0V fixed output voltages
- Fast transient response
- Good noise rejection
- Package: TO252-3L, TO263-2L, TO220-3L
BLOCK DIAGRAM
VIN 3
2 VOUT
Thermal
Shutdown
+
+-
CURRENT
LIMIT
1.25V
+
+
1
GND
(FIXED)
- 1 Adj
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Aug.26, 2010
1 page  
AX1084
FUNCTION DESCRIPTIONS
Introduction
The AX1084 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-1.5V. The AX1084 only needs 1.5V 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
5.0A load step.
The AX1084 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 AX1084 can be programmed to any voltages in the range of 1.25V to VIN-1.5V 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 = 50uA typically R1 and R2 as shown at below
VIN AX1084
VOUT
Adj
VREF
R1
Iadj=50uA
R2
The AX1084 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
AX1084 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 50uA 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.
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Aug.26, 2010
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX1084.PDF ] | |
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