 |
 |
|
| XC9235 |
|
|||||||||||||||||
 TOREX
|
| |||||||||||||||||
|
6 page 
6/28 XC9235/XC9236/XC9237 Series XC9237B(C)18Cxx, VOUT=1.8V, FOSC=1.2MHz, 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 ① Operating Voltage Range VIN 2.0 - 6.0 V ① Maximum Output Current IOUTMAX VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) 600 - - mA ① U.V.L.O. Voltage VUVLO VCE =VIN, VOUT=0V, Voltage which Lx pin holding “L” level (*1, *11) 1.00 1.40 1.78 V ② Supply Current IDD VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V - 15 33 μA ③ Stand-by Current ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V - 0 1.0 μA ③ Oscillation Frequency FOSC When connected to external components, VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA 1020 1200 1380 kHz ① PFM Switching Current IPFM When connected to external components, VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA (*12) 120 160 200 mA ① Maximum IPFM Limit MAXIPFM VCE=VIN=(C-1), IOUT=1mA (*12) 200 % ① Maximum Duty Cycle MAXDTY VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V 100 - - % ② Minimum Duty Cycle MINDTY VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V - - 0 % ② Efficiency (*2) EFFI When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA - 92 - % ① Lx SW "H" ON Resistance 1 RLxH VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) - 0.35 0.55 Ω ④ Lx SW "H" ON Resistance 2 RLxH VIN=VCE=3.6V, VOUT=0V, ILx=100mA (*3) - 0.42 0.67 Ω ④ Lx SW "L" ON Resistance 1 RLxL VIN=VCE=5.0V (*4) - 0.45 0.66 Ω ④ 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 ⑤ Current Limit (*10) ILIM VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) 900 1050 1350 mA ⑥ Output Voltage Temperature Characteristics △VOUT VOUT・△topr IOUT=30mA, -40℃≦Topr≦85℃ - ±100 - ppm/℃ ① CE "H" Voltage VCEH VOUT=0V, Applied voltage to VCE, Voltage changes Lx to “H” level (*11) 0.65 - VIN V ③ CE "L" Voltage VCEL VOUT=0V, Applied voltage to VCE , Voltage changes Lx to “L” level (*11) VSS - 0.25 V ③ PWM "H" Level Voltage VPWMH When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 1020 kHz≦FOSC≦1380kHz (*13) - - VIN - 1.0 V ① PWM "L" Level Voltage VPWML When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes FOSC＜1020kHz (*13) VIN – 0.25 - - V ① CE "H" Current ICEH VIN=VCE=5.0V, VOUT=0V - 0.1 - 0.1 μA ⑤ CE "L" Current ICEL VIN=5.0V, VCE=0V, VOUT=0V - 0.1 - 0.1 μA ⑤ Soft Start Time (B Series) TSS When connected to external components, VCE=0V → VIN, IOUT=1mA - 0.25 0.40 ms ① Soft Start Time (C Series) TSS When connected to external components, VCE=0V → VIN, IOUT=1mA 0.5 1.0 2.5 ms ① Latch Time TLAT VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1Ω resistance (*7) 1.0 - 20.0 ms ⑦ 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 ⑦ CL Discharge Rdischg VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open 200 300 450 Ω ⑧ ■ELECTRICAL CHARACTERISTICS (Continued) Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Setting 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 MAXIPFM 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. |
