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PDF AX5503 Data sheet ( Hoja de datos )
| Número de pieza | AX5503 | |
| Descripción | MICROPOWER VFM STEP-UP DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX5503 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX5503
MICROPOWER VFM STEP-UP DC/DC
Converter
GENERAL DESCRIPTION
The AX5503 is a high efficiency VFM Step-up DC/DC converter for small, low input
voltage or battery powered systems with ultra low quiescent supply current. The AX5503
accept a positive input voltage from start-up voltage to VOUT and convert it to a higher
output voltage in the 2.2V to 5V range.
The AX5503 combine ultra low quiescent supply current and high efficiency to give
maximum battery life. The high switching frequency and the internally limited peak inductor
current permits the use of small, low cost inductors. Only three external components are
needed an inductor a diode and an output capacitor.
The AX5503 is suitable to be used in battery powered equipment where low noise,
low ripple and ultra low supply current are required. Operating shutdown function is outside
controlling. If EN connects to GND, the IC was been shut down and than the supply current
is lower to 1uA.The AX5503 is available in very small package: SOT-23-5L.
Typical applications are pagers, cameras and video camera, cellular telephones,
wireless telephones, palmtop computer, battery backup supplies, battery powered
equipment.
FEATURES
- Very Low Supply Current is 22uA (typ.)
- Maximum shutdown current <1uA
- Output voltage is available form 2.2V to 5.0V by 0.1V steps
- Output Voltage Accuracy ±5%
- Output Current up to 100mA
- Low ripple and low noise
- Very low start-up voltage
- High efficiency (VOUT = 5V TYP. 87%)
- Few external components
- Low profile: SOT-23-5L Pb-Free
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Feb.29 2012
1 page  
AX5503
OPERATION
The AX5503 architecture is built around a VFM CONTROL logic core, switching
frequency is set through a built in oscillator. TON time is fixed (Typ. 5uS) while TOFF time is
determined by the error amplifier output, a logic signal coming from the comparison made
by the Error Amplifier Stage between the signal coming from the output voltage divider
network and the internal Band-Gap voltage reference (Vref). TOFF reaches a minimum (Typ.
1.7uS) when heavy load conditions are met (Clock frequency 150KHz). An over current
conditions, through the internal power switch, causes a voltage drop VLX=RDSON x ISW and
the VLX limiter block forces the internal switch to be off, so narrowing TON time and limiting
internal power dissipation. In this case the switching frequency may be higher than the
150KHz set by the internal clock generator.
VFM control ensures very low quiescent current and high conversion efficiency even
with very light loads. Since the Output Voltage pin is also used as the device Supply
Voltage, the versions with higher output voltage present an higher internal supply voltage
that results in lower power switch RDSON, slightly greater output power and higher
efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at IOUT=1mA)
once the system is started. If the input voltage exceeds the output voltage, the output will
follow the input, however, the input or output voltage must not be forced above 5.5V.
APPLICATION INFORMATION
Input/output Capacitor Selection
The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior
of these elements. The output ripple voltage is the product of the peak inductor current
and the output capacitor Equivalent Series Resistance (ESR). Best performances are
obtained with good high frequency characteristics capacitors and low ESR. The best
compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower
values may cause higher Output Ripple Voltage and lower Efficiency without
compromising the functionality of the device.
An Input Capacitor is required to compensate, if present, the series impedance
between the Supply Voltage Source and the Input Voltage of the Application.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Feb.29 2012
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX5503.PDF ] | |
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