Axelite AX5505R21, AX5505R22, AX5505R23, AX5505R24, AX5505R25 Schematic [ru]
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AX5505
MICROPOWER VFM SYNCHRONOUS
STEP-UP DC/DC Converter
GENERAL DESCRIPTION
The AX5505 is a high efficiency VFM synchronous Step-up DC/DC converter for small, low input voltage or battery powered systems with ultra-low quiescent supply current. The AX5505 accept a positive input voltage from start-up voltage to VOUT and convert it to a higher output voltage in the 2.1V to 5.0V range.
The AX5505 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 AX5505 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 then the supply current is lower to 1uA.The AX5505 is available in very small packages: SOT23-3L, SOT23-5L and SOT89-3L.
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 is 13uA (typ.)
-Maximum shutdown current <1uA
-Output voltage is available form 2.1V to 5.0V by 0.1V steps
-Output Voltage Accuracy ±2%
-No Schottky Diode Required
-Output Current up to 100mA
-Low ripple and low noise
-Very low start-up voltage at 0.8V
-Few external components
-Low profile: SOT23-3L, SOT23-5L and SOT89-3L Pb-Free
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.09 2011
AX5505
BLOCK DIAGRAM
VOUT |
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P-MOS |
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+ |
- Anti-Reverse |
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Comparator |
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- |
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+ |
LX |
Bandgap |
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LIMITER AMP. |
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Reference |
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VFM |
N-MOS |
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+ |
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CONTROL |
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- |
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ERROR AMP. |
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ON/OFF |
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Control |
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GND |
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EN |
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(SOT23-5L Only) |
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PIN ASSIGNMENT
The packages type: SOT23-3L, SOT23-5L and SOT89-3L; the pin assignment is given by:
Top View
EN NC
5 4
SOT23-5L
1 2 3
LX GND VOUT
Top View
VOUT 3
SOT23-3L
1 2
GND LX
Top View
Tab is VOUT
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SOT89-3L |
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1 |
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2 |
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3 |
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GND VOUT LX |
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Name |
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Description |
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EN |
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Chip Enable Pin (SOT23-5L Only) |
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VOUT |
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Output Voltage Pin |
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NC |
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No Connect Pin |
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GND |
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Ground Pin |
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LX |
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Switch input pin which connected |
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to inductor. |
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2/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.09 2011
AX5505
ORDER/MARKING INFORMATION
Order Information
AX5505 X XX X 
Package Type |
VOUT |
Packing |
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R: SOT23-3L |
21 |
: 2.1V Blank : Bag |
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B: SOT23-5L |
22 |
: 2.2V |
A : Taping |
F: SOT89-3L |
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50 |
: 5.0V |
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Top Marking (SOT23-3L/SOT23-5L) |
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Top Marking (SOT89-3L) |
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L LY WX |
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ID code:internal |
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5 5 |
0 5 |
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Part number |
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Y WX |
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ID code: internal |
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WW:01~26 (A~Z) |
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WW: 01~26 (A~Z) |
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27~52 (a~z) |
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27~52 (a~z) |
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Year: A=2010 |
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Year: A=2010 |
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Identification code |
1=2011 |
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1=2011 |
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Part Number |
Identification Code |
Part Number |
Identification Code |
AX5505-2.1V |
WD |
AX5505-3.6V |
WU |
AX5505-2.2V |
WE |
AX5505-3.7V |
WV |
AX5505-2.3V |
WF |
AX5505-3.8V |
WW |
AX5505-2.4V |
WG |
AX5505-3.9V |
WX |
AX5505-2.5V |
WH |
AX5505-4.0V |
WY |
AX5505-2.6V |
WJ |
AX5505-4.1V |
WZ |
AX5505-2.7V |
WK |
AX5505-4.2V |
Wa |
AX5505-2.8V |
WL |
AX5505-4.3V |
Wb |
AX5505-2.9V |
WM |
AX5505-4.4V |
Wc |
AX5505-3.0V |
WN |
AX5505-4.5V |
Wd |
AX5505-3.1V |
WP |
AX5505-4.6V |
We |
AX5505-3.2V |
WQ |
AX5505-4.7V |
Wf |
AX5505-3.3V |
WR |
AX5505-4.8V |
Wg |
AX5505-3.4V |
WS |
AX5505-4.9V |
Wh |
AX5505-3.5V |
WT |
AX5505-5.0V |
Wi |
3/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.09 2011
AX5505
ABSOLUTE MAXIMUM RATINGS (at TA = 25°C)
Characteristics |
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Symbol |
Rating |
Unit |
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VIN Pin Voltage |
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VIN |
5.5 |
V |
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LX Voltage |
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VLX |
5.5 |
V |
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OUT Pin Voltage |
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VOUT |
5.5 |
V |
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EN Pin Voltage |
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VEN |
-0.3 to VOUT+0.3 |
V |
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Storage Temperature Range |
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TSTG |
-40 to +150 |
°C |
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Operating Junction Temperature Range |
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TJ |
-20 to +100 |
°C |
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Power Dissipation |
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PD |
( TJ-TA ) / θJA |
mW |
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SOT23-3L |
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180 |
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Thermal Resistance from Junction to case |
SOT23-5L |
θJC |
°C/W |
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SOT89-3L |
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100 |
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SOT23-3L |
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250 |
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Thermal Resistance from Junction to ambient |
SOT23-5L |
θJA |
°C/W |
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SOT89-3L |
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160 |
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Note: θJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer).
ELECTRICAL CHARACTERISTICS
(VIN = VOUT × 0.6, IOUT=10mA, TA = 25°C, unless otherwise specified)
Characteristics |
Symbol |
Conditions |
Min |
Typ |
Max |
Units |
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Output Voltage Accuracy |
VOUT |
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-2 |
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+2 |
% |
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Start-up Voltage |
VSTART-UP |
IOUT=1mA |
- |
0.8 |
0.95 |
V |
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VIN =rising from 0 to 2V |
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Hold-on Voltage |
VHOLD |
IOUT=1mA |
0.6 |
- |
- |
V |
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VIN =falling from 2 to 0V |
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Supply Current |
ISUPPLY |
No Load |
- |
13 |
- |
uA |
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Quiescent Current |
IQ |
IOUT =0mA, VIN=VOUT + 0.5V |
- |
6 |
- |
uA |
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Shutdown Current |
ISD |
VEN=0V |
- |
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1 |
uA |
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(SOT23-5L Only) |
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PMOS Switch ON |
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ILX=100mA |
- |
1000 |
- |
mΩ |
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Resistance P-RDS(ON) |
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NMOS Switch ON |
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ILX=100mA |
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600 |
- |
mΩ |
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Resistance N-RDS(ON) |
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Maximum Oscillator Frequency |
FOSC |
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125 |
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KHz |
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Oscillator Duty On |
DON |
To be measure on SW pin |
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77 |
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% |
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Enable Input Threshold |
VENH |
Driver ON |
0.75 |
- |
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V |
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(SOT23-5L Only) |
VENL |
Driver OFF |
- |
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0.2 |
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Enable Input Current |
IENH |
VEN=VIN |
- |
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0.1 |
uA |
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(SOT23-5L Only) |
IENL |
VEN=0V |
- |
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1 |
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VIN=1.5V, |
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89 |
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% |
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VOUT=2.2V, IOUT=10mA |
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Efficiency |
η |
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VIN=1.5V, |
- |
87 |
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% |
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VOUT=3.0V, IOUT=10mA |
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4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.09 2011
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