XC9248
Series
■ELECTRICAL
CHARACTERISTICS
XC9248 Series
PARAMETER
Operating Voltage Range
FB Voltage
FB Voltage
Temperature Characteristics
Maximum Output Current
Supply Current
Stand-by Current
Oscillation Frequency
Maximum Duty Cycle
UVLO Detection Voltage
SYMBOL
V
IN
V
FB
VFB/
(VFB・ΔTopr)
I
OUTMAX
I
q
I
STB
f
OSC
D
max
V
UVLOD
CONDITIONS
When connected to external components
V
IN
≦7V:
Setup V
OUT
=3.3V
V
IN
>7V: Setup V
OUT
=5V
V
FB
=Sweep (0.812V→0.788V), V
SS
=OPEN
-40℃≦Topr≦105℃
When connected to external components
V
IN
=V
EN
=18V, V
FB
=0.9V
V
IN
=18V, V
EN
=0V, V
FB
=OPEN
V
FB
=0.7V, V
SS
=OPEN
V
FB
=0.7V, V
SS
=OPEN
V
IN
=Sweep (4.5V→3.5V) , V
EN
=2V, V
FB
=0.9V
Voltage when V
L
pin changes from
“H” level to “L” level
UVLO Release Voltage
Low side Current Limit
Integral Latch Time
(Type A)
Internal Soft-start Time
SS Terminal Current
SS Threshold Voltage
OVP Detection Voltage
Efficiency
Lx SW ”H” ON Resistance
Lx SW ”L” ON Resistance
EN ”H” Voltage
V
UVLOR
I
LIMLS
t
LAT
(*2)
Ta=25℃
MIN.
4.5
0.788
TYP.
-
0.800
±40
2.2
-
-
450
74
3.50
(*1)
MAX.
18
0.812
UNITS
V
V
ppm/℃
CIRCUIT
①
②
②
①
③
③
②
②
④
-
0.76
38
500
79
3.80
-
1.10
51
550
-
4.45
A
mA
μA
kHz
%
V
V
IN
=Sweep (3.5V→4.5V), V
EN
=2V, V
FB
=0.9V
Voltage when V
L
pin changes from
“L” level to “H” level
V
FB
=0.9V, I
LX
= I
LIMLS
Time until SS pin changes from
“H” level to “L” level
t
SS
I
SS
V
SSTH
V
OVPD
EFFI
(*3)
(*2)
(*2)
3.55
2.1
0.4
3.90
-
1.1
4.50
-
1.8
V
A
ms
④
⑦
⑤
V
OUT
=4.5V (Forced), Bottom point of L
X
pin current
V
IN
=12V, V
EN
=2V, V
FB
=0.72V, V
SS
=OPEN
Time until L
X
pin oscillates
V
SS
=0V, V
LX
=V
FB
=OPEN
V
FB
=0.72V, V
SS
=OPEN
Voltage when L
X
pin oscillates
V
FB
=Sweep (0.788V→1.2V), V
SS
=OPEN
Setup V
OUT
=5V, I
OUT
=0.7A
When connected to external components
-
2
1.2
-
-
-
-
2.8
4
1.8
0.9
93.8
0.12
0.12
-
(*4)
(*4)
-
6
2.4
1.2
-
-
-
-
ms
μA
V
V
%
Ω
Ω
V
②
⑥
②
②
⑧
-
-
④
R
LXH
R
LXL
V
IN
=12V, V
FB
=0.9V, V
EN
=Sweep (0.2V→1.4V)
V
ENH
Voltage when V
L
pin changes from
“L” level to “H” level
(*2)
1.4
V
IN
=12V, V
FB
=0.9V, V
EN
=Sweep (1.4V→0.2V)
EN ”L” Voltage
LX ”L” Current
EN ”H” Current
EN ”L” Current
FB ”H” Current
FB ”L” Current
Thermal Shutdown Temperature
Hysteresis Width
C
L
Discharge Resistance
C
L
Discharge Current
(*1)
V
ENL
I
LXL
I
ENH
I
ENL
I
FBH
I
FBL
T
TSD
T
HYS
R
DCHG
I
DCHG
Voltage when V
L
pin changes from
“H” level to “L” level
(*2)
-
-1
-
-0.1
-0.1
-0.1
-
-
-
0
16
-
-
-
150
25
300
9
0.2
-
21
0.1
0.1
0.1
-
-
-
-
V
μA
μA
μA
μA
μA
°C
°C
Ω
mA
④
⑥
⑥
⑥
⑥
⑥
-
-
⑥
⑥
V
IN
=18V , V
EN
=V
LX
=0V , V
FB
=V
SS
=OPEN
V
IN
=V
EN
=18V , V
LX
=V
FB
=V
SS
=OPEN
V
IN
=18V , V
EN
=0V , V
LX
=V
FB
=V
SS
=OPEN
V
IN
=18V , V
EN
=0V , V
FB
=5V , V
LX
=V
SS
=OPEN
V
IN
=18V , V
EN
=V
FB
=0V , V
LX
=V
SS
=OPEN
V
IN
=12V , V
EN
=0V , V
LX
=2V , V
FB
=V
SS
=OPEN
V
IN
=12V , V
EN
=0V , V
LX
=12V , V
FB
=V
SS
=OPEN
-
-
Unless otherwise stated, V
IN
=V
EN
=12V
Mount conditions affect heat dissipation. Maximum output current is not guaranteed when Thermal Shutdown starts to operate earlier.
(*2)
“H”=4.3V½5V, “L”=－0.1V½0.1V
(*3)
EFFI = {[(output voltage)×(output current)]÷[(input voltage)×(input current)]}×100
(*4)
Design value
5/21
TOREX [ TOREX SEMICONDUCTOR ]
