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PDF AX1209 Data sheet ( Hoja de datos )

Número de pieza AX1209
Descripción 2A LDO Linear Regulator
Fabricantes AXElite 
Logotipo AXElite Logotipo



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AX1209
2A LDO Linear Regulator with Enable
GENERAL DESCRIPTION
The AX1209 is a low-dropout voltage regulator suitable for various electronic
equipments. It provides constant voltage power source. The dropout voltage of AX1209 is
1.1V in full rated current (2A). This regulator has various functions such as a peak current
protection, a thermal shut down, a short circuit protect.
The AX1209 is available in TO252-5L power package which features small size to
reduce the junction-to-case resistance.
FEATURES
- Operating voltage range: 7V~24V.
- Adjustable Output Version
- Low Dropout voltage: 1.1V (typical) at 2A Output Current.
- Current-Limit and Thermal Shutdown Protection.
- Short circuit protection.
- Shutdown function.
- Built internal driver.
- TO252-5L Pb-Free Package.
BLOCK DIAGRAM
VCC
COMP/SD
Current
Limit
Compensation/
Shutdown
Thermal
Shutdown
Driver
Error
- + Amp
Vref=1.25V
0.25V
VOUT
FB
GND
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jun.22, 2010

1 page




AX1209 pdf
AX1209
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and Low ESR
Capacitor has noise from the device. The input capacitor impedance at the switching
frequency shall be less than input source impedance to prevent high frequency switching
current passing to the input. A low ESR input capacitor sized for maximum RMS current
must be used.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure
regulation loop stability. The output capacitor (C2) value selection is very important for this
IC, please refer the below table to design.
7VVCC18V, C2= 220uF~470uF
16VVCC20V, C2=100uF
18VVCC24V, C2=47uF
The capacitor voltage rating should be at least 1.5 times greater than the output
voltage, and often much higher voltage ratings are needed to satisfy.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jun.22, 2010

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