XC9236 Torex Semiconductor, XC9236 Datasheet - Page 7

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

■ELECTRICAL CHARACTERISTICS (Continued)
XC9237B(C)18Dxx, V
Temperature Characteristics
Test conditions: Unless otherwise stated, V
NOTE:
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
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)
Operating Voltage Range
Maximum Output Current
PFM Switching Current
PWM "H" Level Voltage
PWM "L" Level Voltage
Oscillation Frequency
Maximum IPFM Limit
Maximum Duty Cycle
Minimum Duty Cycle
*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
*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
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
Threshold Voltage
Stand-by Current
U.V.L.O. Voltage
Current Limit
Short Protection
CE "H" Current
Output Voltage
Supply Current
Output Voltage
CE "H" Voltage
CE "L" Voltage
CE "L" Current
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.
PARAMETER
CL Discharge
Latch Time
Efficiency
IN
IN
~V
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
IN
-1.2V, “L”=+0.1V~-0.1V
(*10)
OUT
(*5)
=1.8V, FOSC=3.0MHz, Ta=25℃
IN
- Lx pin measurement voltage) / 100mA
V
PFM
OUT
OUT
SYMBOL
MAXDTY
MAXI
MINDTY
Rdischg
I
△V
V
FOSC
V
V
OUTMAX
V
EFFI
I
and MAXI
V
V
R
R
V
R
R
T
I
LeakH
I
SHORT
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
I
・△topr
I
T
T
V
I
PWMH
I
PWML
UVLO
PFM
CEH
STB
CEL
LIM
OUT
CEH
PWMH
DD
CEL
LAT
LxH
LxH
LxL
LxL
SS
SS
IN
OUT
PFM
IN
=5.0V, V
and V
PFM
V
V
I
frequency becomes 2550kHz≦FOSC≦
3450kHz
I
frequency becomes FOSC＜2550kHz
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,
When connected to external components,
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
becomes “L” level within 1ms
OUT
OUT
OUT
V
PWML
IN
IN
IN
because those are only for the PFM control’s functions.
IN
IN
CE
IN
IN
CE
IN
IN
CE
IN
IN
IN
IN
IN
IN
OUT
OUT
IN
IN
CE
CE
OUT(E)
IN
=V
=V
=V
=V
=V
=V
=5.0V, V
=V
=V
=V
=V
=V
=V
=V
=V
=V
=5.0V, V
=V
=V
=V
=1mA
=1mA
=0V → V
=0V → V
=30mA, -40℃≦Topr≦85℃
=5.0V, L
=0V, Applied voltage to V
=0V, Applied voltage to V
CE
OUT(E)
OUT(E)
CE
OUT(E)
CE
CE
CE
CE
CE
CE
CE
OUT
CE
CE
because those are only for the XC9237 series’ functions.
IN
IN
IN
=Setting Voltage
=5.0V, V
=5.0V, I
, V
=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
=5.0V, V
(*13)
(*6)
(*6)
OUT
+2.0V, V
+2.0V, V
+2.0V, V
CE
CE
OUT
OUT(E)
X
, Voltage which oscillation
, Voltage which oscillation
=5.0V, V
=0V, V
=0V, V
IN
IN
=0V,
(*4)
(*4)
CONDITIONS
, V
, I
, I
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
+1.2V, I
OUT
OUT
OUT
IN
CE
=0.8×V
=30mA
=V
CE
CE
=1mA
CE
=V
=V
=V
=0V, Lx=0V
=V
=0V
OUT
=0V, I
=0V, I
OUT
=1mA
=1mA
voltage which Lx
CE
=1.0V, I
=V
=1.0V,
CE
OUT(E)
OUT(E)
OUT(E)
OUT(E)
=5.0V, Short Lx at
=V
=0V
=0V, V
IN
OUT
(*7)
, I
(*12)
Lx
Lx
OUT(E)
OUT(E)
×1.1V
×0.9V
×0.1V
=100mA
=100mA
×0.9V
OUT
=100mA
OUT
CE
CE
OUT
=1mA
,
×1.1V
(*11)
,
(*11)
,
=100mA
=open
(*8)
(*3)
(*3)
IN
(*12)
(*1,*11)
(*13)
minus 1.0V and equal to or greater than V
(*9)
1.764
0.675 0.900 1.150
2550
MIN.
V
1.00
0.65
- 0.1
- 0.1
0.25
600
170
100
900
V
200
0.5
1.0
2.0
IN
-
-
-
-
-
-
-
-
-
-
-
-
-
SS
XC9235/XC9236/XC9237
–
±100
TYP.
1.800 1.836
3000
1050
1.40
0.35
0.42
0.45
0.52
0.01
0.32
220
200
300
0.9
21
86
0
-
-
-
-
-
-
-
-
-
-
-
MAX. UNIT CIRCUIT
3450
1350
1.78
0.55
0.67
0.66
0.77
0.25
0.50
V
270
300
450
6.0
1.0
1.0
0.1
0.1
2.5
V
1.0
35
20
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
Series
.
IN
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minus
-
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