XC9248
Series
■ELECTRICAL CHARACTERISTICS
XC9248 Series
Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN.
4.5
TYP.
-
MAX.
18
UNITS
V
CIRCUIT
When connected to external components
Operating Voltage Range
VIN
①
VIN ≦7V: Setup VOUT=3.3V
V
IN >7V: Setup VOUT=5V
FB Voltage
FB Voltage
VFB
VFB=Sweep (0.812V→0.788V), VSS=OPEN
0.788
0.800
±40
0.812
V
②
②
VFB/
-40℃≦Topr≦105℃
ppm/℃
Temperature Characteristics (VFB・ΔTopr)
Maximum Output Current
Supply Current
IOUTMAX
Iq
When connected to external components
VIN=VEN=18V, VFB=0.9V
2.2(*1)
-
-
1.10
51
A
①
③
③
②
②
-
-
0.76
38
mA
μA
kHz
%
Stand-by Current
ISTB
VIN=18V, VEN=0V, VFB=OPEN
VFB=0.7V, VSS=OPEN
Oscillation Frequency
Maximum Duty Cycle
fOSC
Dmax
450
74
500
79
550
-
VFB=0.7V, VSS=OPEN
VIN=Sweep (4.5V→3.5V) , VEN=2V, VFB=0.9V
Voltage when VL pin changes from
“H” level to “L” level (*2)
UVLO Detection Voltage
VUVLOD
3.50
3.80
4.45
V
④
VIN=Sweep (3.5V→4.5V), VEN=2V, VFB=0.9V
Voltage when VL pin changes from
“L” level to “H” level (*2)
UVLO Release Voltage
Low side Current Limit
VUVLOR
ILIMLS
tLAT
3.55
2.1
3.90
-
4.50
-
V
A
④
⑦
⑤
VOUT=4.5V (Forced), Bottom point of LX pin current
V
FB=0.9V, ILX = ILIMLS
Integral Latch Time
(Type A)
0.4
1.1
1.8
ms
Time until SS pin changes from
“H” level to “L” level (*2)
VIN=12V, VEN=2V, VFB=0.72V, VSS=OPEN
Time until LX pin oscillates
Internal Soft-start Time
SS Terminal Current
SS Threshold Voltage
OVP Detection Voltage
Efficiency
tSS
ISS
-
2
2.8
4
-
6
ms
μA
V
②
⑥
②
②
⑧
VSS=0V, VLX=VFB=OPEN
V
FB=0.72V, VSS=OPEN
VSSTH
VOVPD
EFFI (*3)
1.2
-
1.8
0.9
93.8
2.4
1.2
-
Voltage when LX pin oscillates
VFB=Sweep (0.788V→1.2V), VSS=OPEN
Setup VOUT=5V, IOUT=0.7A
V
-
%
When connected to external components
Lx SW ”H” ON Resistance
Lx SW ”L” ON Resistance
RLXH
RLXL
-
-
0.12(*4)
0.12(*4)
-
-
Ω
Ω
-
-
VIN=12V, VFB=0.9V, VEN=Sweep (0.2V→1.4V)
Voltage when VL pin changes from
“L” level to “H” level (*2)
EN ”H” Voltage
EN ”L” Voltage
VENH
1.4
-
-
-
-
V
V
④
④
VIN=12V, VFB=0.9V, VEN=Sweep (1.4V→0.2V)
Voltage when VL pin changes from
“H” level to “L” level (*2)
VENL
0.2
ILXL
IENH
VIN=18V , VEN=VLX=0V , VFB=VSS=OPEN
VIN=VEN=18V , VLX=VFB=VSS=OPEN
VIN=18V , VEN=0V , VLX=VFB=VSS=OPEN
VIN=18V , VEN=0V , VFB=5V , VLX=VSS=OPEN
VIN=18V , VEN=VFB=0V , VLX=VSS=OPEN
-1
0
16
-
-
21
0.1
0.1
0.1
-
μA
μA
μA
μA
μA
°C
⑥
⑥
⑥
⑥
⑥
-
LX ”L” Current
EN ”H” Current
-
IENL
-0.1
EN ”L” Current
IFBH
-0.1
-
FB ”H” Current
IFBL
-0.1
-
FB ”L” Current
TTSD
THYS
RDCHG
IDCHG
-
-
-
-
150
25
300
9
Thermal Shutdown Temperature
Hysteresis Width
-
°C
-
VIN=12V , VEN=0V , VLX=2V , VFB=VSS=OPEN
VIN=12V , VEN=0V , VLX=12V , VFB=VSS=OPEN
-
Ω
⑥
⑥
CL Discharge Resistance
CL Discharge Current
-
mA
Unless otherwise stated, VIN=VEN=12V
(*1) Mount conditions affect heat dissipation. Maximum output current is not guaranteed when Thermal Shutdown starts to operate earlier.
(*2) “H”=4.3V～5V, “L”=－0.1V～0.1V
(*3) EFFI = {[(output voltage)×(output current)]÷[(input voltage)×(input current)]}×100
(*4) Design value
5/21
TOREX [ Torex Semiconductor ]
