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XC9248
Series
■ELECTRICAL CHARACTERISTICS
XC9248 Series Ta=25℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
CIRCUIT
Operating Voltage Range V
IN
When connected to external components
V
IN
≦7V: Setup V
OUT
=3.3V
V
IN
>7V: Setup V
OUT
=5V
4.5 - 18 V
①
FB Voltage V
FB
V
FB
=Sweep (0.812V→0.788V), V
SS
=OPEN
0.788 0.800 0.812 V
②
FB Voltage
Temperature Characteristics
VFB/
(VFB・ΔTopr)
-40℃≦Topr≦105℃
±40
ppm/℃ ②
Maximum Output Current I
OUTMAX
When connected to external components 2.2
(*1)
- - A
①
Supply Current I
q
V
IN
=V
EN
=18V, V
FB
=0.9V - 0.76 1.10 mA
③
Stand-by Current I
STB
V
IN
=18V, V
EN
=0V, V
FB
=OPEN - 38 51
μA ③
Oscillation Frequency f
OSC
V
FB
=0.7V, V
SS
=OPEN 450 500 550 kHz
②
Maximum Duty Cycle D
max
V
FB
=0.7V, V
SS
=OPEN 74 79 - %
②
UVLO Detection Voltage V
UVLOD
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
(*2)
3.50 3.80 4.45 V
④
UVLO Release Voltage V
UVLOR
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
(*2)
3.55 3.90 4.50 V
④
Low side Current Limit I
LIMLS
V
OUT
=4.5V (Forced), Bottom point of L
X
pin current
2.1 - - A
⑦
Integral Latch Time
(Type A)
t
LAT
V
FB
=0.9V, I
LX
= I
LIMLS
Time until SS pin changes from
“H” level to “L” level
(*2)
0.4 1.1 1.8 ms
⑤
Internal Soft-start Time t
SS
V
IN
=12V, V
EN
=2V, V
FB
=0.72V, V
SS
=OPEN
Time until L
X
pin oscillates
- 2.8 - ms
②
SS Terminal Current I
SS
V
SS
=0V, V
LX
=V
FB
=OPEN 2 4 6
μA ⑥
SS Threshold Voltage V
SSTH
V
FB
=0.72V, V
SS
=OPEN
Voltage when L
X
pin oscillates
1.2 1.8 2.4 V
②
OVP Detection Voltage V
OVPD
V
FB
=Sweep (0.788V→1.2V), V
SS
=OPEN - 0.9 1.2 V
②
Efficiency EFFI
(*3)
Setup V
OUT
=5V, I
OUT
=0.7A
When connected to external components
- 93.8 - %
⑧
Lx SW ”H” ON Resistance R
LXH
- 0.12
(*4)
- Ω
-
Lx SW ”L” ON Resistance R
LXL
- 0.12
(*4)
- Ω
-
EN ”H” Voltage V
ENH
V
IN
=12V, V
FB
=0.9V, V
EN
=Sweep (0.2V→1.4V)
Voltage when V
L
pin changes from
“L” level to “H” level
(*2)
1.4 - - V
④
EN ”L” Voltage V
ENL
V
IN
=12V, V
FB
=0.9V, V
EN
=Sweep (1.4V→0.2V)
Voltage when V
L
pin changes from
“H” level to “L” level
(*2)
- - 0.2 V
④
LX ”L” Current
I
LXL
V
IN
=18V , V
EN
=V
LX
=0V , V
FB
=V
SS
=OPEN -1 0 -
μA ⑥
EN ”H” Current
I
ENH
V
IN
=V
EN
=18V , V
LX
=V
FB
=V
SS
=OPEN - 16 21
μA ⑥
EN ”L” Current
I
ENL
V
IN
=18V , V
EN
=0V , V
LX
=V
FB
=V
SS
=OPEN -0.1 - 0.1
μA ⑥
FB ”H” Current
I
FBH
V
IN
=18V , V
EN
=0V , V
FB
=5V , V
LX
=V
SS
=OPEN -0.1 - 0.1
μA ⑥
FB ”L” Current
I
FBL
V
IN
=18V , V
EN
=V
FB
=0V , V
LX
=V
SS
=OPEN -0.1 - 0.1
μA ⑥
Thermal Shutdown Temperature
T
TSD
- 150 - °C -
Hysteresis Width
T
HYS
- 25 - °C -
C
L
Discharge Resistance
R
DCHG
V
IN
=12V , V
EN
=0V , V
LX
=2V , V
FB
=V
SS
=OPEN - 300 -
Ω ⑥
C
L
Discharge Current
I
DCHG
V
IN
=12V , V
EN
=0V , V
LX
=12V , V
FB
=V
SS
=OPEN - 9 - mA
⑥
Unless otherwise stated, V
IN
=V
EN
=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
