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PDF AX5502 Data sheet ( Hoja de datos )
| Número de pieza | AX5502 | |
| 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 AX5502 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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AX5502
MICROPOWER VFM STEP-UP DC/DC Converter
GENERAL DESCRIPTION
The AX5502 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 AX5502
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 AX5502 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 AX5502 is suitable to be used in battery powered equipment where low noise,
low ripple and ultra low supply current are required. The AX5502 is available in very small
package: SOT-23-3L, SOT-23-5L and SOT-89-3L.
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
- Regulated Output Voltage
- Wide range of 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-23-3L, SOT-23-5L and SOT-89-3L Pb-Free
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Feb.29 2012
1 page  
AX5502
APPLICATION CIRCUIT
VIN
L1
47uH
C1
100uF
C2
0.1uF
NC SW
GND
NC OUT
AX5502
D1
B 140
C4
0.1uF
Vout
C3
47uF
OPERATION
The AX5502 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 150 KHz). 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
150 KHz 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.
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Feb.29 2012
5 Page 
(3) SOT-89-3L
D1
AX5502
1.7
0.4
80(2x)
e1
e
D
0.9 1.5
Land Pattern Recommendation (Unit: mm)
50(2x)
b b1 b
C
Symbol
A
b
b1
C
D
D1
e
e1
E
HE
L
Dimensions in Millimeters
Min. Nom. Max.
1.40 1.50
1.60
0.36 0.42
0.48
0.44 0.50
0.56
0.35 0.40
0.44
4.40 4.50
4.60
1.35 1.59
1.83
3.0 BSC
1.5 BSC
2.29 2.45
2.60
3.94 4.10
4.25
0.80 1.00
1.20
JEDEC outline: TO-243 AB
Dimensions in Inches
Min. Nom. Max.
0.055 0.059 0.063
0.014 0.017 0.019
0.017 0.02 0.022
0.014 0.016 0.017
0.173 0.177 0.181
0.053 0.063 0.072
0.118 BSC
0.059 BSC
0.09 0.097 0.102
0.155 0.161 0.167
0.031 0.04 0.047
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Feb.29 2012
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX5502.PDF ] | |
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