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PDF AX6608A Data sheet ( Hoja de datos )
| Número de pieza | AX6608A | |
| Descripción | 300mA Low Dropout Linear Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6608A
300mA Low Dropout Linear Regulator
GENERAL DESCRIPTION
The AX6608A is a low dropout, high PSRR, low noise linear regulator with very low
quiescent. It can supply 300mA output current with low dropout about 250mV. The Device
includes pass element, error amplifier, band-gap, current-limit and thermal shutdown
circuitry. The characteristics of low dropout voltage and less quiescent current make it good
for some critical current application, for example, some battery powered devices. The typical
quiescent current is approximately 30µA. Built-in current-limit and thermal-shutdown
functions prevent any fault condition from IC damage.
The AX6608A series are offering three different fixed output voltage types including
1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3V and 3.3V. They are available in low-profile,
space-saving 3-lead SOT23 package.
FEATURES
- Input voltage range : 2.8V~5.5V
- Dropout voltage is 250mV at 300mA output current
- Guaranteed 300mA output current
- Low quiescent current is 30µA (typ.)
- ±2% Output voltage accuracy for 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3V and 3.3V
- Needs only 1uF capacitor for stability
- Fast transient response
- Current limit and thermal shutdown protection
- Available in the SOT23-3L Package
BLOCK DIAGRAM
VIN
Current
Limit
SThhuetdrmowaln
Error
Amp
-+
Vref=1.2V
VOUT
GND
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.9 May.31, 2011
1 page  
AX6608A
Current Limit and Thermal Shutdown Protection
In order to prevent overloading or thermal condition from damaging the device,
AX6608A regulator has internal thermal and current limiting functions designed to protect the
device. It will rapidly shut off PMOS pass element during overloading or over temperature
condition.
Thermal Considerations
The AX6608A series can deliver a current of up to 300mA over the full operating
junction temperature range. However, the maximum output current must be dated at higher
ambient temperature to ensure the junction temperature does not exceed 125°C. With all
possible conditions, the junction temperature must be within the range specified under
operating conditions. Power dissipation can be calculated based on the output current and
the voltage drop across regulator.
PD = (VIN - VOUT) IOUT
The final operating junction temperature for any set of conditions can be estimated by
the following thermal equation:
PD (MAX) = (TJ (MAX) - TA) / θJA
Where TJ (MAX) is the maximum junction temperature of the die (125°C) and TA is the
maximum ambient temperature. The junction to ambient thermal resistance (θJA) for
SOT23-3L package at recommended minimum footprint is 250°C/W.
PCB Layout
An input capacitance of ≅ 1µF is required between the AX6608A input pin and ground
(the amount of the capacitance may be increased without limit), this capacitor must be
located a distance of not more than 1cm from the input and return to a clean analog ground.
Input capacitor can filter out the input voltage spike caused by the surge current due to the
inductive effect of the package pin and the printed circuit board’s routing wire. Otherwise, the
actual voltage at the VIN pin may exceed the absolute maximum rating. The output capacitor
also must be located a distance of not more than 1cm from output to a clean analog ground.
Because it can filter out the output spike caused by the surge current due to the inductive
effect of the package pin and the printed circuit board’s routing wire.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.9 May.31, 2011
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX6608A.PDF ] | |
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