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XC9235B08DMR-G Datasheet(PDF) 6 Page - Torex Semiconductor

Part No. XC9235B08DMR-G
Description  600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
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Maker  TOREX [Torex Semiconductor]
Homepage  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9235B08DMR-G Datasheet(HTML) 6 Page - Torex Semiconductor

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XC9235/XC9236/XC9237 Series
XC9237A18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
CIRCUIT
Output Voltage
VOUT
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
1.764
1.800
1.836
V
Operating Voltage Range
VIN
2.0
-
6.0
V
Maximum Output Current
IOUTMAX
VIN=VOUT(E)+2.0V, VCE=1.0V,
When connected to external components
(*9)
600
-
-
mA
UVLO Voltage
VUVLO
VCE=VIN, VOUT=0V,
Voltage which Lx pin holding “L” level
(*1,*11)
1.00
1.40
1.78
V
Supply Current
IDD
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
-
21
35
μA
Stand-by Current
ISTB
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
-
0
1.0
μA
Oscillation Frequency
fOSC
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA
2550
3000
3450
kHz
PFM Switching Current
IPFM
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA
(*12)
170
220
270
mA
PFM Duty Limit
DTYLIMIT_PFM
VCE=VIN=(C-1), IOUT=1mA
(*12)
-
200
300
%
Maximum Duty Cycle
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
100
-
-
%
Minimum Duty Cycle
DTYMIN
VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V
-
-
0
%
Efficiency
EFFI
When connected to external components,
VCE=VIN=VOUT(E)+1.2V, IOUT=100mA
-
86
-
%
Lx SW "H" ON Resistance 1
RLxH
VIN=VCE=5.0V, VOUT =0V, ILx=100mA
(*3)
-
0.35
0.55
Ω
Lx SW "H" ON Resistance 2
RLxH
VIN=VCE=3.6V, VOUT =0V, ILx=100mA
(*3)
-
0.42
0.67
Ω
Lx SW "L" ON Resistance 1
RLxL
VIN=VCE=5.0V
(*4)
-
0.45
0.66
Ω
-
Lx SW "L" ON Resistance 2
RLxL
VIN=VCE=3.6V
(*4)
-
0.52
0.77
Ω
-
Lx SW "H" Leak Current
(*5)
ILeakH
VIN=VOUT=5.0V, VCE=0V, Lx=0V
-
0.01
1.0
μA
Lx SW "L" Leak Current
(*5)
ILeakL
VIN=VOUT=5.0V, VCE=0V, Lx=5.0V
-
0.01
1.0
μA
Current Limit
(*10)
ILIM
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
(*8)
900
1050
1350
mA
Output Voltage
Temperature Characteristics
△VOUT/
(VOUT・△Topr)
IOUT=30mA, -40℃≦Topr≦85℃
-
±100
-
ppm/℃
CE "H" Voltage
VCEH
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “H” level
(*11)
0.65
-
6.0
V
CE "L" Voltage
VCEL
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “L” level
(*11)
VSS
-
0.25
V
PWM "H" Level Voltage
VPWMH
When connected to external components,
IOUT=1mA
(*6), Voltage which oscillation frequency
becomes 2550kHz≦fOSC≦3450kHz
(*13)
-
-
VIN - 1.0
V
PWM "L" Level Voltage
VPWML
When connected to external components,
IOUT=1mA
(*6), Voltage which oscillation frequency
becomes fOSC<2550kHz
(*13)
VIN
0.25
-
-
V
CE "H" Current
ICEH
VIN=VCE=5.0V, VOUT=0V
- 0.1
-
0.1
μA
CE "L" Current
ICEL
VIN=5.0V, VCE=0V, VOUT=0V
- 0.1
-
0.1
μA
Soft Start Time
tSS
When connected to external components,
VCE=0V → VIN, IOUT=1mA
0.5
0.9
2.5
ms
Latch Time
tLAT
VIN=VCE=5.0V, VOUT=0.8×VOUT(E),
Short Lx at 1Ω resistance
(*7)
1.0
-
20
ms
Short Protection Threshold
Voltage
VSHORT
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes
“L” level within 1ms
0.675
0.900
1.150
V
■ELECTRICAL CHARACTERISTICS (Continued)
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*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 operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.


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