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PDF AX6631 Data sheet ( Hoja de datos )
| Número de pieza | AX6631 | |
| Descripción | 1.2A High Output Current LDO Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6631
1.2A High Output Current LDO Regulator
GENERAL DESCRIPTION
The AX6631 is a low noise, high output current, low quiescent current and low dropout
linear regulator. The Device includes pass element, error amplifier, band-gap, current limit
and thermal shutdown circuitry. The output current is up to 1.2A, the characteristics of low
dropout voltage and less quiescent current make it good for some critical current application,
and for example, some battery powered devices. The typical quiescent current is
approximately 50µA. In the shutdown mode, the maximum supply current is less than 1uA.
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
- Adjustable Output voltage form 0.8V to 5.0V
- Dropout voltage is 380mV at 1A output current
- Guaranteed 1.2A output current
- Low quiescent current is 50µA (typ.)
- Maximum supply current in shutdown mode <1uA
- Fast transient response
- Current limit and thermal shutdown protection
- Short circuit current fold-back
- Available in the SOP-8L and TO252-5L Pb-Free Packages
BLOCK DIAGRAM
VIN
Current
Limit
EN Enable
Thermal
Shutdown
Error
Amp
-+
Bandgap
VOUT
FB
GND
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Mar.15, 2011
1 page  
AX6631
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines
the lowest usable supply voltage. In battery-powered systems, this determines the useful
end-of-life battery voltage. Because the device uses a PMOS, its dropout voltage is a
function of drain-to source on-resistance, RDS (ON), multiplied by the load current:
VDROPOUT = VIN -VOUT = RDS (ON) x IOUT
Current Limit and Short-Circuit Protection
The AX6631 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, AX6631 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 AX6631 series can deliver a current of up to 1.2A 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 SOP-8L
package at recommended minimum footprint is 60°C/W. Visit our website in which
“Recommended Footprints for Soldering Surface Mount Packages” for detail.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Mar.15, 2011
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX6631.PDF ] | |
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