XC9236 Torex Semiconductor, XC9236 Datasheet - Page 6

• Manufacturer Part Number: XC9236
• Description: 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
• Manufacturer: Torex Semiconductor

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■ELECTRICAL CHARACTERISTICS (Continued)
XC9237B(C)18Cxx, V
Lx SW "H" ON Resistance 2
Temperature Characteristics
Lx SW "H" ON Resistance 1
Lx SW "H" Leak Current
Soft Start Time (C Series)
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Soft Start Time (B Series)
Test conditions: Unless otherwise stated, V
NOTE:
Operating Voltage Range
Maximum Output Current
PFM Switching Current
PWM "H" Level Voltage
PWM "L" Level Voltage
XC9235/XC9236/XC9237
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Maximum I
Threshold Voltage
*3: ON resistance (Ω)= (V
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the
*7: Time until it short-circuits V
*8: When V
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V
*12: XC9235 series exclude I
*13: XC9235/9236 series exclude V
Stand-by Current
U.V.L.O. Voltage
Current Limit
Short Protection
Supply Current
CE "H" Voltage
CE "H" Current
Output Voltage
Output Voltage
CE "L" Voltage
CE "L" Current
PARAMETER
CL Discharge
operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than V
0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than V
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
Efficiency
Latch Time
IN
IN
PFM
~V
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
(*2)
IN
Limit
(*10)
-1.2V, “L”=+0.1V~-0.1V
OUT
(*5)
=1.8V, FOSC=1.2MHz, Ta=25℃
IN
V
- Lx pin measurement voltage) / 100mA
PFM
OUT
OUT
SYMBOL
MAXDTY
MAXI
MINDTY
Rdischg
I
△V
V
FOSC
V
V
OUTMAX
V
I
V
EFFI
V
V
R
R
R
R
T
I
LeakH
I
SHORT
and MAXI
I
・△topr
I
I
PWMH
T
T
V
PWML
UVLO
I
PFM
CEH
STB
CEL
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
OUT
LIM
CEH
DD
CEL
LxH
LxH
LAT
LxL
LxL
SS
SS
PWMH
IN
OUT
PFM
IN
=5.0V, V
and V
PFM
I
becomes 1020 kHz≦FOSC≦1380kHz
I
becomes FOSC＜1020kHz
becomes “L” level within 1ms
When connected to external components,
V
V
When connected to external components
V
Voltage which Lx pin holding “L” level
V
V
When connected to external components,
V
When connected to external components,
V
V
V
V
When connected to external components,
V
V
V
V
V
V
V
I
V
Voltage changes Lx to “H” level
V
Voltage changes Lx to “L” level
When connected to external components,
When connected to external components,
V
V
When connected to external components,
V
When connected to external components,
V
V
Short Lx at 1Ω resistance
Sweeping V
1Ω resistance, V
V
OUT
OUT
OUT
IN
IN
IN
CE
IN
IN
IN
IN
CE
IN
IN
CE
IN
IN
IN
IN
IN
IN
OUT
OUT
IN
IN
CE
CE
IN
PWML
because those are only for the PFM control’s functions.
=V
OUT(E)
=V
=V
=V
=5.0V, V
=V
=V
=V
=V
=V
=V
=V
=V
=V
=V
=V
=5.0V, V
=5.0V, L
=1mA
=1mA
=V
=V
=0V → V
=0V → V
=30mA, -40℃≦Topr≦85℃
=V
=0V, Applied voltage to V
=0V, Applied voltage to V
CE
CE
OUT(E)
CE
OUT(E)
OUT(E)
CE
CE
CE
CE
CE
CE
OUT
CE
CE
IN
IN
because those are only for the XC9237 series’ functions.
IN
=5.0V, V
=5.0V, I
=5.0V, V
=(C-1), I
=5.0V, V
=5.0V, V
=V
=5.0V, V
=3.6V, V
=5.0V
=3.6V
=5.0V, V
=5.0V, V
=Setting Voltage
, V
Series
=5.0V, V
(*6)
(*6)
OUT(E)
+2.0V, V
+2.0V, V
+2.0V, V
, Voltage which oscillation frequency
, Voltage which oscillation frequency
OUT
X
CE
CE
OUT
=5.0V, V
=0V, V
=0V, V
IN
IN
(*4)
(*4)
, V
=0V,
CONDITIONS
OUT
, I
, I
OUT
+1.2V, I
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
CE
=0.8×V
=V
=30mA
CE
CE
CE
=1mA
=V
=V
=V
=0V, I
=0V, I
=0V, Lx=0V
=V
=0V
OUT
OUT
=1mA
=1mA
voltage which Lx
CE
CE
=1.0V,
=1.0V, I
=V
OUT(E)
OUT(E)
OUT(E)
OUT(E)
=0V, V
=5.0V, Short Lx at
=V
=0V
OUT
(*7)
(*13)
IN
OUT(E)
Lx
Lx
(*12)
OUT(E)
, I
=100mA
=100mA
=100mA
×1.1V
×0.9V
×1.1V
×0.9V
OUT
,
OUT
CE
CE
OUT
×1.1V
(*11)
=1mA
,
(*11)
,
=open
=100mA
(*8)
(*13)
(*3)
(*3)
IN
(*1, *11)
(*12)
minus 1.0V and equal to or greater than V
(*9)
1.764
0.675 0.900 1.150
MIN.
1020
V
- 0.1
- 0.1
1.00
0.65
0.25
600
120
100
900
200
V
2.0
0.5
1.0
IN
-
-
-
-
-
-
-
-
-
-
-
-
SS
–
±100
1.800 1.836
1200
1050
TYP.
1.40
0.35
0.42
0.45
0.52
0.01
0.25
160
200
300
1.0
15
92
0
-
-
-
-
-
-
-
-
-
-
-
MAX. UNIT CIRCUIT
1380
1350
1.78
0.55
0.67
0.66
0.77
0.25
0.40
20.0
V
200
450
6.0
1.0
1.0
V
1.0
0.1
0.1
2.5
33
0
IN
-
-
-
-
-
IN
-
ppm/℃
kHz
μA
μA
μA
μA
μA
mA
mA
mA
ms
ms
ms
Ω
Ω
Ω
Ω
Ω
%
%
%
%
V
V
V
V
V
V
V
V
CEH
.
IN
①
①
①
②
③
③
①
①
①
②
②
①
④
④
④
⑤
⑥
①
③
③
①
①
⑤
⑤
①
①
⑦
⑦
⑧
-
minus