Document
General Description
QX5252 is an ASIC for solar LED lawn lights.
Only a peripheral inductor is required to realize the step-up power supply, and the maximum drive efficiency can exceed 84%.
QX5252 has automatical charge characteristic.
QX5252 uses CMOS technology , therefore the power consumption is very small.
QX5252 uses patented technique to realize the LED lights shutdown without flicker when the battery voltage is low.
The operating voltage of QX5252 is 0.9V to 1.5V, suitable for a single AA battery or a single Ni-H battery.
QX5252 Solar LED Driver
Features
Operating Voltage: 0.9V~1.5V 3mA~300mA Output current Patented over-discharge protection:
shutdown without flicker Integrated light control switch Integrated Schottky Diode Only an external inductor is requierd High Efficiency Low quiescent current: 17uA
Applications
Solar lawn Solar Landscape
Typical Application
SBAT BAT
L1
VSS LX
QX5252 QX5252
L1
BAT R1
LS
R2
SBAT VSS
LX
(a)Uses solar panel to achieve light control
(b) Uses photo-resistor to achieve light control
Figure 1:Typical Application Circuit Diagrams of QX5252
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Ordering Information
Type Number
QX5252
QX5252 Solar LED Driver
Package Marking Pin Assignments
5252F XXXX
Lot Number Date
5252F XXXX
1234
BAT
VSS
54
SBAT BAT VSS LX
TO-94
1
SBAT
2
LS
3
LX
SOT23-5
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Pin Description
Pin Name
Package Type and Pin Number
SOT23-5 TO-94
LX 3
4
SBAT VSS BAT LS
1 4 5 2
1 3 2 -
QX5252 Solar LED Driver
Pin Type Description
Output
Input Ground Output Input
Drain of the switching power MOSFET
Connect to solar cells positive terminal
Ground
Connect to rechargeable battery positive terminal
Light sense
Functional Block Diagram
SBAT
Light Sense
Overdischarge protection
Driver
BAT LX
VSS
QX5252_DS03EN
Figure 2:Functional Block Diagram of QX5252
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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QX5252 Solar LED Driver
Absolute Maximum Ratings (Note 1)
Parameter Symbol
Description
Min Max Unit
Voltage
VMAX
Maximum Voltage On SBAT,BAT and LX Pins
7V
Current
ILX_MAX
Maximum Current On LX Pin
800 mA
Power Dissipation
PTO-94 PSOT23-5
Maximum Power Dissipation for PTO-94 Package Maximum Power Dissipation for PSOT23-5 Package
TA Operating Temperature Range
TSTG
Storage Temperature Range
Thermal
TSD1
Soldering Temperature Rang for TO-94 Package (less than 5 sec)
-20 -40 250
0.75 0.25 85 120
260
W W
oC oC
oC
TSD2
Soldering Temperature Rang for SOT23-5 Package (less than 30 sec)
230
240
oC
ESD
VESD
ESD Voltage for Human Body Mode
2000
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Electronic Characteristics
TA =25 oC, L1 =47uH, unless otherwise specified
Parameter Symbol
Test Conditions
Min Typ Max Unit
Supply Voltage
Operating Voltage VBAT
Supply Current
Quiescent Current IBAT0
TON Time
TON Time
TON
Efficiency
Efficiency
η
L1 =180uH,C1=22uF
0.9 1.5 V 17 uA 5 us 84 %
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Typical Electrical Curves
VBAT=1.2V, TA =25 oC, unless otherwise specified
QX5252 Solar LED Driver
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Applications Information
Detailed Description
QX5252 is an ASIC for solar LED lawn lights.
Only a peripheral inductor is required to realize the step-up power supply, and the maximum drive efficiency can exceed 84%.
QX5252 has automatically charge characteristics.
The operating voltage of QX5252 is 0.9V to 1.5V, suitable for a single AA battery or a single Ni-H battery.
QX5252 uses CMOS technology , therefore the power consumption is very small.
QX5252 uses patented technique to realize the LED lights shutdown without flicker when the battery voltage is low.
The internal circuits of QX5252 include switching driver, light control switching circuit, over-discharge protection, and the internal integrated Schottky diode.
QX5252 Solar LED Driver
Light Control Switch Setting
TO-94 Package Uses solar panels to achieve light control.
SOT23-5 Package Uses an external photo-resistor and an ordinary resistor to achieve light control, LS terminal voltage is set by the following equation:
=VLS
R2 ∗VBAT
R1+ R2
When VLS higher than 0.3 * VBAT, the light control switch makes the LED light control
switches off, when VLS lower than 0.22 * VBAT, the light control switch makes the LED lights turn on.
Power Setting
The LED power is set to:
=PLED
2.5
⋅η
⋅
V2 BAT
×10−6
L1
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Package Information
Physical Dimensions for TO-94 Package:
QX5252 Solar LED Driver
QX5252_DS03EN
QX Micro Devices Co., Ltd.
www.qxmd.com.cn
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Physical Dimen.