XC9248 Datasheet, PDF (5/21 Pages) Torex Semiconductor – 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter

XC9248
Series
˙ELECTRICAL CHARACTERISTICS
XC9248 Series
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
Ta=25ˆ
MAX. UNITS CIRCUIT
Operating Voltage Range
When connected to external components
V_IN
V_IN ≦7V: Setup V_OUT=3.3V
4.5
-
18
V
①
V_IN >7V: Setup V_OUT=5V
FB Voltage
V_FB
V_FB=Sweep (0.812V→0.788V), V_SS=OPEN
0.788 0.800 0.812
V
②
FB Voltage
VFB/
-40℃≦Topr≦105℃
Temperature Characteristics (VFB・ΔTopr)
±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
ЖAç
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
V_IN=Sweep (4.5V→3.5V) , V_EN=2V, V_FB=0.9V
UVLO Detection Voltage
V_UVLOD
Voltage when V_L pin changes from
3.50 3.80 4.45
V
④
“H” level to “L” level ^(*2)
V_IN=Sweep (3.5V→4.5V), V_EN=2V, V_FB=0.9V
UVLO Release Voltage
V_UVLOR
Voltage when V_L pin changes from
3.55 3.90 4.50
V
④
“L” level to “H” level ^(*2)
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)
V_FB=0.9V, I_LX = I_LIMLS
t_LAT
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
ЖAç
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
-
93.8
-
%
⑧
When connected to external components
Lx SW ”H” ON Resistance
Lx SW ”L” ON Resistance
R_LXH
R_LXL
-
0.12^(*4)
-
Ω
-
-
0.12^(*4)
-
Ω
-
EN ”H” Voltage
V_IN=12V, V_FB=0.9V, V_EN=Sweep (0.2V→1.4V)
V_ENH
Voltage when V_L pin changes from
1.4
-
-
V
④
“L” level to “H” level ^(*2)
EN ”L” Voltage
V_IN=12V, V_FB=0.9V, V_EN=Sweep (1.4V→0.2V)
V_ENL
Voltage when V_L pin changes from
-
-
0.2
V
④
“H” level to “L” level ^(*2)
LX ”L” Current
I_LXL
V_IN=18V , V_EN=V_LX=0V , V_FB=V_SS=OPEN
-1
0
-
ЖAç
ᶈ
EN ”H” Current
I_ENH
V_IN=V_EN=18V , V_LX=V_FB=V_SS=OPEN
-
16
21
ЖAç
ᶈ
EN ”L” Current
I_ENL
V_IN=18V , V_EN=0V , V_LX=V_FB=V_SS=OPEN
-0.1
-
0.1
ЖAç
ᶈ
FB ”H” Current
I_FBH
V_IN=18V , V_EN=0V , V_FB=5V , V_LX=V_SS=OPEN
-0.1
-
0.1
ЖAç
ᶈ
FB ”L” Current
I_FBL
V_IN=18V , V_EN=V_FB=0V , V_LX=V_SS=OPEN
-0.1
-
0.1
ЖAç
ᶈ
Thermal Shutdown Temperature
T_TSD
ç
-
150
-
°C
-
Hysteresis Width
T_HYS
ç
-
25
-
°C
-
C_L Discharge Resistance
R_DCHG
V_IN=12V , V_EN=0V , V_LX=2V , V_FB=V_SS=OPEN
-
300
-
Њ
ᶈ
C_L Discharge Current
I_DCHG
V_IN=12V , V_EN=0V , V_LX=12V , V_FB=V_SS=OPEN
-
9
-
mA
ᶈ
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}
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