XC9235/XC9236/XC9237
Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9237B(C)(D)(G)18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
SYMBOL
VOUT
CONDITIONS
MIN.
TYP.
MAX. UNIT CIRCUIT
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
1.764
1.800 1.836
V
V
①
①
Operating Voltage Range (B/C series)
Operating Voltage Range (E/G series)
2.0
1.8
-
-
6.0
6.0
VIN
VIN=VOUT(E)+2.0V, VCE=1.0V,
Maximum Output Current
UVLO Voltage
IOUTMAX
VUVLO
600
-
-
mA
V
①
②
When connected to external components (*9)
VCE =VIN, VOUT=VOUT(E)×0.5V (*14)
1.00
1.40
1.78
Voltage which Lx pin holding “L” level (*1, *11)
Supply Current
IDD
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
-
-
15
0
33
μA
μA
③
③
Stand-by Current
ISTB
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
1.0
When connected to external components,
VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA
Oscillation Frequency
PFM Switching Current
fOSC
IPFM
1020
120
1200
160
1380
200
kHz
mA
①
①
When connected to external components,
VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA (*12)
PFM Duty Limit
Maximum Duty Cycle
Minimum Duty Cycle
VCE=VIN=(C-1), IOUT=1mA (*12)
200
%
%
%
①
②
②
DTYLIMIT_PFM
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
100
-
-
-
-
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
0
DTYMIN
When connected to external components,
Efficiency(*2)
EFFI
-
92
-
%
①
V
CE=VIN=VOUT(E)+1.2V, IOUT=100mA
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current (*5)
RLxH
RLxH
RLxL
RLxL
ILeakH
ILIM
VIN=VCE=5.0V, VOUT (E)×0.9V , ILx=100mA (*3)
VIN=VCE=3.6V, VOUT (E)×0.9V , ILx=100mA (*3)
VIN=VCE=5.0V (*4)
-
0.35
0.42
0.45
0.52
0.01
1050
0.55
0.67
0.66
0.77
1.0
Ω
Ω
④
④
④
-
-
-
Ω
VIN=VCE=3.6V (*4)
-
-
Ω
VIN=VOUT=5.0V, VCE=0V, Lx=0V
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8)
μA
mA
⑤
⑥
Current Limit (*10)
900
1350
Output Voltage
Temperature Characteristics (VOUT・△topr)
△VOUT
/
IOUT=30mA, -40℃≦Topr≦85℃
-
±100
-
ppm/
℃
①
③
③
VOUT
Voltage changes Lx to “H” level (*11)
VOUT VOUT(E)×0.9V, Applied voltage to VCE
Voltage changes Lx to “L” level (*11)
= VOUT(E)×0.9V, Applied voltage to VCE,
CE "H" Voltage
CE "L" Voltage
VCEH
VCEL
0.65
VSS
-
-
6.0
0.25
V
=
,
V
When connected to external components, IOUT=1mA
(*6), Voltage which oscillation frequency becomes 1020
PWM "H" Level Voltage
VPWMH
-
-
VIN - 1.0
V
①
kHz≦fOSC≦
1380kHz (*13)
When connected to external components, IOUT=1mA
VIN
0.25
–
PWM "L" Level Voltage
VPWML
(*6), Voltage which oscillation frequency becomes fOSC
1020kHz (*13)
＜
-
-
V
①
CE "H" Current
CE "L" Current
ICEH
ICEL
VIN=VCE=5.0V, VOUT
VIN=5.0V, VCE=0V, VOUT
When connected to external components,
CE=0V → VIN, IOUT=1mA
When connected to external components,
CE=0V → VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8 VOUT(E)
Short Lx at 1
resistance (*7)
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
resistance, VOUT voltage which Lx becomes “L” 0.675 0.900 1.150
=
VOUT(E)×0.9V
- 0.1
- 0.1
-
-
0.1
0.1
μA
μA
⑤
⑤
=
VOUT(E)×0.9V
Soft Start Time (B/C Series)
Soft Start Time (E/G Series)
Latch Time
tSS
tSS
-
0.25
1.0
-
0.40
2.5
ms
ms
ms
①
①
⑦
V
0.5
1.0
V
×
,
tLAT
20.0
Ω
Short Protection Threshold
Voltage (B/C Series)
VSHORT
1
Ω
V
⑦
level within 1ms
VIN=VCE=5.0V, The VOUT at Lx=”Low"(*11) while
decreasing VOUT from VOUT (E)×0.4V
Short Protection Threshold
Voltage (E/G Series)
VSHORT
RDCHG
0.338 0.450 0.563
200 300 450
V
⑦
⑧
CL Discharge
VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open
Ω
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage, applied voltage sequence is VOUT→VIN→VCE
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.
*14: VIN is applied when VOUT (E) x 0.5V becomes more than VIN.
7/32
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