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PDF AX1008 Data sheet ( Hoja de datos )
| Número de pieza | AX1008 | |
| Descripción | 5A Low Dropout Linear Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX1008 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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AX1008
5A Low Dropout Linear Regulator
GENERAL DESCRIPTION
AX1008 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. AX1008 is also well suited for other applications such as VGA cards.
AX1008 is guaranteed to have lower than 1.5V dropout at full load current making it ideal to
provide well-regulated outputs of 1.2V to 5V.
FEATURES
- 1.5V maximum dropout at full load current
- Built-in thermal shutdown
- Output current limiting
- Adjustable and 1.2V/1.5V/1.8V/2.5V/3.3V/5.0V fixed output voltages
- 10uF or greater MLCCs are available for stability
- 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.1.6 Dec.24, 2012
1 page  
AX1008
FUNCTION DESCRIPTIONS
Introduction
The AX1008 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 AX1008 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 AX1008 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 AX1008 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 AX1008
VOUT
Adj
VREF
R1
Iadj=50uA
R2
The AX1008 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
AX1008 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.
Load Regulation
Since the AX1008 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
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Dec.24, 2012
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX1008.PDF ] | |
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