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PDF AX5523 Data sheet ( Hoja de datos )
| Número de pieza | AX5523 | |
| Descripción | High Efficiency 1.2MHz 2A Step Up Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX5523 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX5523
High Efficiency 1.2MHz 2A Step Up Converter
GENERAL DESCRIPTION
The AX5523 is a constant frequency, 6-pin SOT23 current mode step-up converter
intended for small, low power applications. The AX5523 switches at 1.2MHz and allows the
use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start
results in small inrush current and extends battery life.
The AX5523 features automatic shifting to pulse frequency modulation mode at light
loads. The AX5523 includes under-voltage lockout, current limiting, and thermal overload
protection to prevent damage in the event of an output overload. The AX5523 is available
in a small 6-pin SOT-23 package.
FEATURES
- Integrated 80mΩ Power MOSFET
- 2.6V to 16V Input Voltage
- 1.2MHz Fixed Switching Frequency
- Internal 4A Switch Current Limit
- Adjustable Output Voltage
- Internal Compensation
- Up to 28V Output Voltage
- Automatic Pulse Frequency Modulation Mode at Light Loads
- up to 97% Efficiency
- Available in a 6-Pin SOT23-6 package
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 May.06, 2013
1 page  
AX5523
APPLICATION INFORMATION
Setting the Output Voltage
The internal reference VREF is 0.6V (Typical).The output voltage is divided by a
resistor divider, R1 and R2 to the FB pin. The output voltage is given by
Inductor Selection
VOUT
VREF
(1
R1 )
R2
The recommended values of inductor are 4.7 to 22μH. Small size and better
efficiency are the major concerns for portable device, such as AX5523 used for mobile
phone. The inductor should have low core loss at 1.2MHz and low DCR for better
efficiency. To avoid inductor saturation current rating should be considered.
Capacitor Selection
Input and output ceramic capacitors of 22μF are recommended for AX5523
applications. For better voltage filtering, ceramic capacitors with low ESR are
recommended. X5R and X7R types are suitable because of their wider voltage and
temperature ranges.
Diode Selection
Schottky diode is a good choice for AX5523 because of its low forward voltage drop
and fast reverses recovery. Using Schottky diode can get better efficiency. The high speed
rectification is also a good characteristic of Schottky diode for high switching frequency.
Current rating of the diode must meet the root mean square of the peak current and
output average current multiplication as following:
I D (RMS ) IOUT I PEAK
The diode’s reverse breakdown voltage should be larger than the output voltage.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 May.06, 2013
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX5523.PDF ] | |
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