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PDF AX6602 Data sheet ( Hoja de datos )
| Número de pieza | AX6602 | |
| Descripción | 300mA LDO Regulator | |
| Fabricantes | AXElite | |
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AX6602
300mA LDO Regulator with Enable
GENERAL DESCRIPTION
The AX6602 is a 300mA, low quiescent, high PSRR, low noise and low dropout linear
regulator. 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 90µA. In the shutdown
mode, the maximum supply current is less than 1uA. The Output voltage is adjustable from
1.225 to 5.5V. Built-in current-limit, Short current protection and thermal-shutdown functions
prevent any fault condition from IC damage.
FEATURES
- Input voltage range is up to 6V
- 200mV Dropout at 150mA output current
- Guaranteed 300mA output current
- Low quiescent current 90µA (typ.)
- Adjustable Output voltage form 1.225V to 5.5V
- Maximum shutdown current <1uA
- Fast transient response
- Current limit and thermal shutdown protection
- Short circuit current fold-back
- Available in the 5-Pin Pb-Free SOT-23 Package
BLOCK DIAGRAM
VIN VOUT
Current
Limit
EN Enable
Thermal
Shutdown
Error
Amp
-+
Bandgap
FB
GND
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Jun.29, 2010
1 page  
AX6602
APPLICATION INFORMATION
Like any low-dropout regulator, the AX6602 requires input and output decoupling
capacitors. The device is specifically designed for portable applications requiring minimum
board space and smallest components. These capacitors must be correctly selected for
good performance (see Capacitor Characteristics Section). Please note that linear regulators
with a low dropout voltage have high internal loop gains which require care in guarding
against oscillation caused by insufficient decoupling capacitance.
Capacitor Selection
Normally, use a 1µF capacitor on the input and a 2.2µF capacitor on the output of the
AX6602. Larger input capacitor values and lower ESR (X5R, X7R) provide better
supply-noise rejection and transient response. A higher- value output capacitor (10µF) may
be necessary if large, fast transients are anticipated and the device is located several inches
from the power source.
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 AX6602 uses 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, AX6602 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 AX6602 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
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Jun.29, 2010
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX6602.PDF ] | |
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