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PDF AX6634 Data sheet ( Hoja de datos )
| Número de pieza | AX6634 | |
| Descripción | 600mA High Output Current LDO Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6634
600mA High Output Current LDO Regulator
GENERAL DESCRIPTION
The AX6634/A is a low noise, low quiescent current, low dropout and high output
accuracy linear regulator. The Device includes pass element, error amplifier, band-gap,
current-limit and thermal shutdown circuitry. The output current is up to 600mA. The
characteristics of low dropout voltage and less quiescent current make it good for some
critical current application, for example, some battery powered devices. Due to internal
flexible design, result in extensively fixed output voltage versions form 1.2V to 5V per 0.1V
steps. Built-in current-limit, Short current protection and thermal-shutdown functions prevent
any fault condition from IC damage.
FEATURES
- Input voltage range : 2.6V~5.5V
- Dropout voltage is 220mV at 600mA output current
- Guaranteed 600mA output current
- Fixed Output voltage is form 1.2 V to 5V by 0.1V steps.
- Fast transient response
- Current limit and thermal shutdown protection
- Short circuit current fold-back
- Available in the 3-Pin Pb-Free SOT-89 and SOT223 packages
BLOCK DIAGRAM
VIN
Current
Limit
Enable
Thermal
Shutdown
Error
Amp
-+
Bandgap
VOUT
GND
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.7 Mar.15, 2011
1 page  
AX6634
Current Limit and Short-Circuit Protection
The AX6634/A used a current sense-resistor to monitor the output current. A portion of
the PMOS output transistor’s current is mirrored to a resistor such that the voltage across
this resistor is proportional to the output current. Once the output current exceeds limit
threshold, AX6634/A would be protected with a limited output current. Further more, when
the output is short to ground, the output current would be folded-back to a less limit.
Thermal Considerations
The AX6634/A series can deliver a current of up to 600mA 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
SOT89-3L package at recommended minimum footprint is 160°C/W (please refer Maximum
rating table). Visit our website in which “Recommended Footprints for Soldering Surface
Mount Packages” for detail.
PCB Layout
An input capacitance of ≅ 2.2µF is required between the AX6634/A 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.
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.7 Mar.15, 2011
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX6634.PDF ] | |
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