Kingbor Technology Co.,Ltd
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KB4312
RECOMMENDED OPERATION CONDITIONS
Parameter
Power supply voltage
Operating temperature
Symbol
V
IN
Top
Min.
2.5
-30
Values
Typ.
+25
Max.
6.5
+85
Unit
V
ELECTRICAL CHARACTERISTICS
(V
IN
=2.5V, Ta=+25
, unless otherwise noted)
Parameter
Operating V
IN
Range
Under Voltage Thershold
No Load Current
Shutdown Current
Feedback Reference (+/-5%)
Feedback Reference (+/-2%)
Over-voltage Threshold
Over-voltage Hysteresis
OVP Leakage Current
Output Voltage Line Regulation
Switching Frequency
Maximum Duty
Soft-Start charging time
Switching Current Limit
LX ON Resistance
LX Leakage Current
EN Input Current
EN Input Level
EN low Shutdown Delay
EN Low Cycle Time
EN High Cycle Time
Symbol
Test Condition
V
IN
input Voltage
V
IN
UVLO
I
IN1
I
IN3
V
FB
V
FB
V
OVP
I
OVP
f
OSC
D
MAX
t
SS
ILX
R
LX
I
Leakage
I
EN
V
IH
V
IL
t
CYCL
t
CYCH
Min.
2.5
Typ. Max. Units
-
6.5
V
V
IN
falling, 100mV hysteresis 1.4
1.5
1.6
V
No Switching , FB>0.2V
-
1
3
mA
EN=0V
-
-
1
uA
KB4312B
0.225 0.240 0.255
V
1.245 1.270 1.295
V
KB4312A
16
17
20
V
KB4312B
2
V
EN=0V
-
-
1
uA
2.5V< V
IN
<6.0V
-
0.1
-
%
0.5
-
0.05
-
-
-
-
1.5
-
0.05
0.05
0.8
90
0.2
0.15
0.40
-
-
-
-
4
1.0
-
-
-
1
1
-
0.4
4
4
MHz
%
ms
A
uA
uA
V
V
ms
ms
ms
V
IN
=3.0V,duty cycle=80% ,
V
IN
=2.5V, ILX =750mA
V
LX
=16V, EN=0V
EN=5V
Note(1)
Note(1)
Note(1): t
CYCL
and t
CYCH
are included rising time and falling time of PWM signal.
Recommended PCB Layout
KB4312B
3
KINGBOR [ KINGBOR TECHNOLOGY CO ]
