XC9236A33CMR-G

XC9235/XC9236/XC9237 Series ETR0514-015 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters ☆GreenOperation Compatible ■GENERAL DESCRIPTION The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω P-channel MOS driver transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A～C types), 1.8V to 6.0V (D～G types). For the D/F types which have a reference voltage of 0.8V (accuracy: ±2.0%), the output voltage can be set from 0.9V by using two external resistors. The A/B/C/E/G types have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower. The B to G types integrate CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function. Four types of package SOT-25, USP-6C, USP-6EL and WLP-5-03 are available. ■APPLICATIONS ●Smart phones / Mobile phones ●Bluetooth ●Mobile devices / terminals ●Portable game consoles ●Digital still cameras / Camcorders ●Note PCs / Tablet PCs ■TYPICAL APPLICATION CIRCUIT ●XC9235/XC9236/XC9237 A/B/C/E/G types (Output Voltage Fixed) ■FEATURES Driver Transistor Built-In : 0.42Ω P-ch driver transistor 0.52Ω N-ch switch transistor Input Voltage : 2.0V ~ 6.0V (A/B/C types) 1.8V ~ 6.0V (D/E/F/G types) Output Voltage : 0.8V ~ 4.0V (Internally set) 0.9V ~ 6.0V (Externally set) High Efficiency : 92% (TYP.)* Output Current : 600mA Oscillation Frequency : 1.2MHz, 3.0MHz (+15%) Maximum Duty Cycle : 100% Control Methods : PWM (XC9235) PWM/PFM Auto (XC9236) PWM/PFM Manual (XC9237) Function : Current Limiter Circuit Built-In (Constant Current & Latching) CL Discharge (B/C/D/E/F/G types) High Speed Soft Start (B/F/G type) Capacitor : Low ESR Ceramic Capacitor Operating Ambient Temperature :-40℃ ~ +85℃ Packages : SOT-25 (A/B/C types only) USP-6C USP-6EL(A/B/C/G types only) WLP-5-03(A/B types only) Environmentally Friendly : EU RoHS Compliant, Pb Free * Performance depends on external components and wiring on the PCB. ■TYPICAL PERFORMANCE CHARACTERISTICS ●XC9235/XC9236/XC9237 ●Efficiency vs. Output Current（fOSC=1.2MHz, VOUT=1.8V） D/F types (Output Voltage Externally Set) 100 PWM/PFM Automatic Sw itching Control 90 Efficiency: EFFI (%) Efficency:EFFI(%) 80 VIN= 4.2V 70 60 50 PWM Control VIN= 4.2V 3.6V 2.4V 3.6V 2.4V 40 30 20 10 0 0.1 1 10 100 1000 Output Current:IOUT(mA) 1/40 XC9235/XC9236/XC9237 Series ■PIN CONFIGURATION Lx VOUT 5 4 1 2 VIN VSS VIN 6 1 Lx VSS 5 2 VSS CE/MODE 4 3 VOUT (FB) VIN 6 1 Lx VSS 5 2 VSS CE/MODE 4 3 VOUT 3 CE/MODE SOT-25 SOT-25 (TOP VIEW) (Top View) USP-6C (BOTTOM VIEW) USP-6EL (BOTTOM VIEW) * Please short the VSS pin (No. 2 and 5). * The dissipation pad for the USP-6C/USP-6EL packages should be solder-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release. We recommend keeping the dissipation pas electrically isolated from the other Pins. If the pad needs to be connected to other pins, it should be connected to the VSS (No. 5) pin. WLP-5-03 (BOTTOM VIEW) ■PIN ASSIGNMENT 2/40 SOT-25 1 2 3 PIN NUMBER USP-6C/USP-6EL 6 2, 5 4 WLP-5-03 2 3 1 4 3 4 5 1 5 PIN NAME FUNCTIONS VIN VSS CE / MODE VOUT FB Lx Power Input Ground High Active Enable / Mode Selection Pin Fixed Output Voltage Pin (A/B/C/E/G types) Output Voltage Sense Pin (D/F types) Switching Output XC9235/XC9236/XC9237 Series ■PRODUCT CLASSIFICATION ●Ordering Information XC9235①②③④⑤⑥-⑦(*1) XC9236①②③④⑤⑥-⑦(*1) XC9237①②③④⑤⑥-⑦(*1) DESIGNATOR ITEM Fixed Output voltage (VOUT) Functional selection ① Adjustable Output voltage (FB) Functional selection Fixed PWM control PWM / PFM automatic switching control Fixed PWM control QPWM / PFM automatic switching manual selection SYMBOL A VIN≧2.0V, No CL discharge, Low speed soft-start B VIN≧2.0V, CL discharge, High speed soft-start C VIN≧2.0V, CL discharge, Low speed soft-start E VIN≧1.8V, CL discharge, Low speed soft-start G VIN≧1.8V, CL discharge, High speed soft-start D VIN≧1.8V, CL discharge, Low speed soft-start F VIN≧1.8V, CL discharge, High speed soft-start Fixed Output Voltage (VOUT) 08 ~ 40 Adjustable Output Voltage (FB) 08 ②③ ④ ⑤⑥-⑦ DESCRIPTION Output voltage options e.g. VOUT=2.8V→②=2, ③=8 VOUT=2.85V→②=2, ③=L 0.05V increments: 0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E, 0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M Reference voltage is fixed in 0.8V ②=0, ③=8 C 1.2MHz D 3.0MHz Oscillation Frequency Packages (Order Unit) MR SOT-25(*2) (3,000pcs/Reel) MR-G SOT-25(*2) (3,000pcs/Reel) ER USP-6C (3,000pcs/Reel) ER-G USP-6C (3,000pcs/Reel) 4R-G USP-6EL(*4) (3,000pcs/Reel) 0R-G WLP-5-03 (*3) (3,000pcs/Reel) (*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. SOT-25 package are available for the A/B/C series only. (*3) WLP-5-03 package is available for the A/B series only. (*4) USP-6EL package are available for the A/B/C/G series only. (*2) 3/40 XC9235/XC9236/XC9237 Series ■FUNCTION CE/MODE H Level L Level OPERATIONAL STATES XC9235 Synchronous PWM Fixed Control Stand-by XC9236 Synchronous PWM/PFM Automatic Switching Stand-by (*1) Please do not leave the CE/MODE pin open. (*2) XC9237 series CE/MODE pin voltage level range H Level ： VIN - 0.25V ≦ H Level ≦ 6.0V M Level ： 0.65V ≦ M Level ≦ VIN - 1.0V L Level ： 0V ≦ L Level ≦ 0.25V 4/40 CE/MODE OPERATIONAL STATES XC9237 Synchronous H Level (*2) PWM/PFM Automatic Switching M Level (*2) L Level (*2) Synchronous PWM Fixed Control Stand-by XC9235/XC9236/XC9237 Series ■BLOCK DIAGRAM ●XC9235 / XC9236 / XC9237 A Series ●XC9235 / XC9236 / XC9237 B/C/E/G ●XC9235 / XC9236 / XC9237 D/F Series NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside, and XC9235 series chooses only PWM control. The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9236 series chooses only PWM/PFM automatic switching control. Diodes inside the circuit are ESD protection diodes and parasitic diodes. ■ABSOLUTE MAXIMUM RATINGS Ta=25℃ PARAMETER SYMBOL RATINGS UNIT VIN Pin Voltage Lx Pin Voltage VOUT Pin Voltage FB Pin Voltage VIN VLX VOUT VFB - 0.3 ~ 6.5 - 0.3 ~ VIN + 0.3 - 0.3 ~ 6.5 - 0.3 ~ 6.5 V V V V VCE/MODE ILx - 0.3 ~ 6.5 ±1500 250 V mA CE / MODE Pin Voltage Lx Pin Current SOT-25 USP-6C USP-6EL WLP-5-03 Operating Ambient Temperature Storage Temperature Power Dissipation Pd Topr Tstg 120 120 750 - 40 ~ + 85 - 55 ~ + 125 mW O O C C 5/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS XC9235A18Cxx/XC9236A18Cxx/XC9237A18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃ PARAMETER SYMBOL Output Voltage VOUT Operating Voltage Range VIN CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA Maximum Output Current IOUTMAX VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) UVLO Voltage VUVLO VCE =VIN, VOUT=0V, Voltage which Lx pin holding “L” level (*1, *11) MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 V ① 2.0 - 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ Supply Current IDD VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V - 15 33 μA ② Stand-by Current ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V - 0 1.0 μA ② 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 PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V Minimum Duty Cycle DMIN VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) Efficiency (*2) Lx SW "H" ON Resistance 1 EFFI RLxH VCE=VIN=(C-1), IOUT=1mA (*12) (*3) 200 300 % ① 100 - - % ③ - - 0 % ③ - 92 - % ① - 0.35 0.55 Ω ④ Lx SW "H" ON Resistance 2 RLxH VIN=VCE=3.6V, VOUT=0V, ILx=100mA - 0.42 0.67 Ω ④ Lx SW "L" ON Resistance 1 RLxL VIN=VCE=5.0V (*4) - 0.45 0.65 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 Lx SW "L" Leak Current (*5) ILEAKL VIN=VOUT=5.0V, VCE=0V, Lx=5.0V Current Limit (*10) Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage ILIM VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) △VOUT/ I =30mA, -40℃≦Topr≦85℃ (VOUT・△Topr) OUT VOUT=0V, Applied voltage to VCE, VCEH Voltage changes Lx to “H” level (*11) VOUT=0V, Applied voltage to VCE , VCEL Voltage changes Lx to “L” level (*11) PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current ICEH ICEL Soft Start Time tSS Latch Time tLAT Short Protection Threshold Voltage VSHORT When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 1020 kHz≦fOSC≦1380kHz (*13) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes fOSC＜1020kHz (*13) VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1Ω resistance, VOUT voltage which Lx becomes “L” level within 1ms - 0.01 1.0 μA ⑤ 900 1050 1350 mA ⑥ - ±100 - ppm/℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN – 0.25 - - V ① - 0.1 - 0.1 - 0.1 0.1 μA μA ⑤ ⑤ 0.5 1.0 2.5 ms ① 1.0 - 20.0 ms ⑦ 0.675 0.900 1.150 V ⑦ 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/XC9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions. 6/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235A18Dxx/XC9236A18Dxx/XC9237A18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃ PARAMETER SYMBOL Output Voltage VOUT Operating Voltage Range VIN CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA Maximum Output Current IOUTMAX VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) UVLO Voltage VUVLO VCE=VIN, VOUT=0V, Voltage which Lx pin holding “L” level (*1,*11) MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 V ① 2.0 - 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ Supply Current IDD VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V - 21 35 μA ② Stand-by Current ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V - 0 1.0 μA ② Oscillation Frequency fOSC When connected to external components, VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA 2550 3000 3450 kHz ① PFM Switching Current IPFM When connected to external components, VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12) 170 220 270 mA ① VCE=VIN=(C-1), IOUT=1mA (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V Minimum Duty Cycle DMIN Efficiency (*2) EFFI VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V When connected to external components, VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT =0V, ILx=100mA (*3) VIN=VCE=3.6V, VOUT =0V, ILx=100mA (*3) VIN=VCE=5.0V (*4) VIN=VCE=3.6V (*4) VIN=VOUT=5.0V, VCE=0V, Lx=0V VIN=VOUT=5.0V, VCE=0V, Lx=5.0V VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) Lx SW "H" ON Resistance 1 RLxH Lx SW "H" ON Resistance 2 RLxH Lx SW "L" ON Resistance 1 RLxL Lx SW "L" ON Resistance 2 RLxL Lx SW "H" Leak Current (*5) ILEAKH Lx SW "L" Leak Current (*5) ILEAKL Current Limit (*10) ILIM Output Voltage △VOUT/ I =30mA, -40℃≦Topr≦85℃ Temperature Characteristics (VOUT・△Topr) OUT VOUT=0V, Applied voltage to VCE, CE "H" Voltage VCEH Voltage changes Lx to “H” level (*11) VOUT=0V, Applied voltage to VCE, CE "L" Voltage VCEL Voltage changes Lx to “L” level (*11) PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current ICEH ICEL Soft Start Time tSS Latch Time tLAT Short Protection Threshold Voltage VSHORT When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 2550kHz≦fOSC≦3450kHz (*13) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes fOSC＜2550kHz (*13) VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1Ω resistance, VOUT voltage which Lx becomes “L” level within 1ms - 200 300 % ① 100 - - % ③ - - 0 % ③ - 86 - % ① 900 0.35 0.42 0.45 0.52 0.01 0.01 1050 0.55 0.67 0.65 0.77 1.0 1.0 1350 Ω Ω Ω Ω μA μA mA ④ ④ ⑤ ⑤ ⑥ - ±100 - ppm/℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN – 0.25 - - V ① - 0.1 - 0.1 - 0.1 0.1 μA μA ⑤ ⑤ 0.5 0.9 2.5 ms ① 1.0 - 20 ms ⑦ 0.675 0.900 1.150 V ⑦ 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/XC9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions. 7/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235B(C)(E)(G)18Cxx/XC9236B(C)(E)(G)18Cxx/XC9237B(C)(E)(G)18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃ PARAMETER SYMBOL Output Voltage VOUT Operating Voltage Range (B/C series) Operating Voltage Range (E/G series) VIN Maximum Output Current IOUTMAX UVLO Voltage VUVLO Supply Current Stand-by Current IDD ISTB Oscillation Frequency fOSC PFM Switching Current IPFM CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) VCE =VIN, VOUT=VOUT(E)×0.5V (*14) Voltage which Lx pin holding “L” level (*1, *11) VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V When connected to external components, VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA When connected to external components, VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA (*12) VCE=VIN=(C-1), IOUT=1mA (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V Minimum Duty Cycle DMIN MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 V ① 2.0 1.8 - 6.0 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ - 15 0 33 1.0 μA μA ② ② 1020 1200 1380 kHz ① 120 160 200 mA ① 200 300 % ① 100 - - % ③ - - 0 % ③ - 92 - % ① Lx SW "H" ON Resistance 1 RLxH VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT (E)×0.9V , ILx=100mA (*3) - 0.35 0.55 Ω ④ Lx SW "H" ON Resistance 2 RLxH VIN=VCE=3.6V, VOUT (E)×0.9V , ILx=100mA (*3) - 0.42 0.67 Ω ④ Lx SW "L" ON Resistance 1 RLxL VIN=VCE=5.0V (*4) - 0.45 0.65 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 ⑤ 900 1050 1350 mA ⑥ - ±100 - ppm/℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN – 0.25 - - V ① - 0.1 - 0.1 - 0.1 0.1 μA μA ⑤ ⑤ - 0.25 0.40 ms ① 0.5 1.0 2.5 ms ① 1.0 - 20.0 ms ⑦ 0.675 0.900 1.150 V ⑦ 0.338 0.450 0.563 V ⑦ 200 300 450 Ω ⑧ Efficiency (*2) Current Limit (*10) Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage EFFI ILIM VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) △VOUT/ I =30mA, -40℃≦Topr≦85℃ (VOUT・△Topr) OUT VOUT= VOUT(E)×0.9V, Applied voltage to VCE, VCEH Voltage changes Lx to “H” level (*11) VOUT= VOUT(E)×0.9V, Applied voltage to VCE , VCEL Voltage changes Lx to “L” level (*11) PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current ICEH ICEL Soft Start Time (B/G Series) tSS Soft Start Time (C/E Series) tSS Latch Time tLAT Short Protection Threshold Voltage (B/C Series) VSHORT Short Protection Threshold Voltage (E/G Series) VSHORT CL Discharge RDCHG When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 1020 kHz≦fOSC≦1380kHz (*13) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes fOSC＜1020kHz (*13) VIN=VCE=5.0V, VOUT= VOUT(E)×0.9V VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9V When connected to external components, VCE=0V → VIN, IOUT=1mA When connected to external components, VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1Ω resistance, VOUT voltage which Lx becomes “L” level within 1ms VIN=VCE=5.0V, The VOUT at Lx=”Low"(*11) while decreasing VOUT from VOUT (E)×0.4V VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open 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/XC9236 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. 8/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235B(C)(E)(G)18Dxx/XC9236B(C)(E)(G)18Dxx/XC9237B(C)(E)(G)18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃ PARAMETER SYMBOL Output Voltage VOUT Operating Voltage Range (B/C series) Operating Voltage Range (E/G series) VIN Maximum Output Current IOUTMAX UVLO Voltage VUVLO Supply Current Stand-by Current IDD ISTB Oscillation Frequency fOSC PFM Switching Current IPFM CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) VCE=VIN, VOUT=VOUT(E)×0.5V (*14), Voltage which Lx pin holding “L” level (*1,*11) VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V When connected to external components, VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA When connected to external components, VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12) VCE=VIN=(C-1), IOUT=1mA (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V Minimum Duty Cycle DMIN VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V When connected to external components, VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V, ILx=100mA (*3) VIN=VCE=3.6V, VOUT=VOUT(E)×0.9V, ILx=100mA (*3) VIN=VCE=5.0V (*4) VIN=VCE=3.6V (*4) VIN=VOUT=5.0V, VCE=0V, Lx=0V VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) (*2) Efficiency 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) Current Limit (*10) Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage EFFI RLxH RLxH RLxL RLxL ILEAKH ILIM △VOUT/ I =30mA, -40℃≦Topr≦85℃ (VOUT・△Topr) OUT VOUT=VOUT(E)×0.9V, Applied voltage to VCE, VCEH Voltage changes Lx to “H” level (*11) VOUT=VOUT(E)×0.9V, Applied voltage to VCE, VCEL Voltage changes Lx to “L” level (*11) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 2550kHz≦fOSC≦3450kHz (*13) PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current ICEH ICEL Soft Start Time (B/G Series) tSS Soft Start Time (C/E Series) tSS Latch Time tLAT Short Protection Threshold Voltage (B/C Series) VSHORT Short Protection Threshold Voltage (E/G Series) VSHORT VIN=VCE=5.0V, The VOUT at Lx=”Low"(*11) while decreasing VOUT from VOUT (E)×0.4V CL Discharge RDCHG VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes fOSC＜2550kHz (*13) VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V VIN=5.0V, VCE=0V, VOUT=VOUT(E)×0.9V When connected to external components, VCE=0V → VIN, IOUT=1mA When connected to external components, VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1Ω resistance, VOUT voltage which Lx becomes “L” level within 1ms MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.800 1.836 V ① 2.0 1.8 - 6.0 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ - 21 0 35 1.0 μA μA ② ② 2550 3000 3450 kHz ① 170 220 270 mA ① - 200 300 % ① 100 - - % ③ - - 0 % ③ - 86 - % ① 900 0.35 0.42 0.45 0.52 0.01 1050 0.55 0.67 0.65 0.77 1.0 1350 Ω Ω Ω Ω μA mA ④ ④ ⑤ ⑥ - ±100 - ppm/℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN – 0.25 - - V ① - 0.1 - 0.1 - 0.1 0.1 μA μA ⑤ ⑤ - 0.32 0.50 ms ① 0.5 0.9 2.5 ms ① 1.0 - 20 ms ⑦ 0.675 0.900 1.150 V ⑦ 0.338 0.450 0.563 V ⑦ 200 300 450 Ω ⑧ 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/XC9236 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. 9/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235D(F)08Cxx/XC9236D(F)08Cxx/XC9237D(F)08Cxx, FB Type, fOSC=1.2MHz, Ta=25℃ PARAMETER SYMBOL FB Voltage VFB Operating Voltage Range VIN Maximum Output Current IOUTMAX UVLO Voltage VUVLO Supply Current Stand-by Current IDD ISTB Oscillation Frequency fOSC PFM Switching Current IPFM CONDITIONS (*11) VIN = VCE =5.0V, The VFB at Lx=”High" decreasing FB pin voltage from 0.9V. while VIN=3.2V, VCE=1.0V When connected to external components (*9) VCE = VIN , VFB = 0.4V, Voltage which Lx pin holding “L” level (*1,*11) VIN =VCE=5.0V, VFB= 0.88V VIN =5.0V, VCE=0V, VFB= 0.88V When connected to external components, VIN = 3.2V, VCE=1.0V, IOUT=100mA When connected to external components, VIN =3.2V, VCE = VIN , IOUT=1mA (*12) VCE= VIN =2.0V IOUT=1mA (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN = VCE =5.0V, VFB = 0.72V Minimum Duty Cycle DMIN VIN = VCE =5.0V, VFB = 0.88V When connected to external components, VCE = VIN ＝ 2.4V, IOUT = 100mA VIN = VCE = 5.0V, VFB = 0.72V,ILX = 100mA (*3) VIN = VCE = 3.6V, VFB = 0.72V,ILX = 100mA (*3) VIN = VCE = 5.0V (*4) VIN = VCE = 3.6V (*4) VIN = VFB = 5.0V, VCE = 0V, LX= 0V VIN = VCE= 5.0V, VFB = 0.72V (*8) IOUT =30mA -40℃≦Topr≦85℃ VFB =0.72V, Applied voltage to VCE, Voltage changes Lx to “H” level (*11) VFB =0.72V, Applied voltage to VCE, Voltage changes Lx to “L” level (*11) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes 1020kHz≦fOSC≦1380kHz (*13) When connected to external components, IOUT=1mA (*6), Voltage which oscillation frequency becomes fOSC＜1020kHz (*13) VIN = VCE =5.0V, VFB =0.72V VIN =5.0V, VCE = 0V, VFB =0.72V When connected to external components, VCE = 0V → VIN , IOUT=1mA VIN=VCE=5.0V, VFB=0.64, Short Lx at 1Ω resistance (*7) VIN = VCE =5.0V, The VFB at Lx=”Low" (*11) while decreasing FB pin voltage from 0.4V. Efficiency (*2) EFFI 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) Current Limit (*10) Output Voltage Temperature Characteristics RLｘH RLｘH RLｘL RLｘL ILEAKH ILIM △VOUT/ (VOUT・△Topr) CE "H" Voltage VCEH CE "L" Voltage VCEL PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current Soft Start Time (D series) Soft Start Time (F series) ICEH ICEL Latch Time tLAT Short Protection Threshold Voltage VSHORT CL Discharge RDCHG tSS VIN = 5.0V ,LX = 5.0V, VCE = 0V, VFB= open MIN. TYP. MAX. UNIT CIRCUIT 0.784 0.800 0.816 V ③ 1.8 - 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ - 15 0 1.0 μA μA ② ② 1020 1200 1380 kHz ① 120 160 200 mA ① 200 300 % ① 100 - - % ③ - - 0 % ③ - 92 - % ① 900 0.35 0.42 0.45 0.52 0.01 1050 0.55 0.67 0.65 0.77 1.0 1350 Ω Ω Ω Ω μA mA ④ ④ ⑨ ⑥ - ±100 - ppm/ ℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN 0.25 - - V ① - 0.1 - 0.1 0.5 - 1.0 0.25 0.1 0.1 2.5 0.40 μA μA ⑤ ⑤ ms ① 1.0 - 20.0 ms ⑦ 0.15 0.200 0.25 V ⑦ 200 300 450 Ω ⑧ Test conditions: VOUT=1.2V when the external components are connected. 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 VFB 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/XC9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions. 10/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235D(F)08Dxx/XC9236D(F)08Dxx/XC9237D(F)08Dxx, FB, fOSC=3.0MHz, Ta=25℃ PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT CIRCUIT FB Voltage VFB VIN = VCE =5.0V, The VFB at Lx=”High"(*11) while decreasing FB pin voltage from 0.9V. 0.784 0.800 0.816 V ③ Operating Voltage Range VIN Maximum Output Current IOUTMAX VIN=3.2V, VCE=1.0V When connected to external components (*9) UVLO Voltage VUVLO VCE = VIN , VFB = 0.4V , Voltage which Lx pin holding “L” level (*1, *11) 1.8 - 6.0 V ① 600 - - mA ① 1.00 1.40 1.78 V ③ Supply Current IDD VIN =VCE=5.0V, VFB= 0.88V - 21 35 μA ② Stand-by Current ISTB - 0 1.0 μA ② Oscillation Frequency fOSC 2550 3000 3450 kHz ① PFM Switching Current IPFM VIN =5.0V, VCE=0V, VFB= 0.88V When connected to external components, VIN = 3.2V, VCE=1.0V, IOUT=100mA When connected to external components, VIN =3.2V, VCE = VIN , IOUT=1mA (*12) 170 220 270 mA ① (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN = VCE =5.0V, VFB = 0.72V Minimum Duty Cycle DMIN VIN = VCE =5.0V, VFB = 0.88V When connected to external components, VCE = VIN ＝ 2.4V, IOUT = 100mA VIN = VCE = 5.0V, VFB = 0.72V,ILX = 100mA (*3) VIN = VCE = 3.6V, VFB = 0.72V,ILX = 100mA (*3) VIN = VCE = 5.0V (*4) VIN = VCE = 3.6V (*4) VIN = VFB = 5.0V, VCE = 0V, LX= 0V VIN = VCE= 5.0V, VFB = 0.72V (*8) IOUT =30mA -40℃≦Topr≦85℃ VFB =0.72V , VCE, Voltage changes Lx to “H” level (*11) VFB =0.72V, VCE, Voltage changes Lx to “L” level (*11) When connected to external components, IOUT = 1mA (*6), Voltage which oscillation frequency becomes 2550kHz≦fOSC≦3450kHz (*13) When connected to external components, IOUT = 1mA (*6), Voltage which oscillation frequency becomes fOSC＜2550kHz (*13) VIN = VCE =5.0V, VFB =0.72V VIN =5.0V, VCE = 0V, VFB =0.72V When connected to external components, VCE = 0V → VIN , IOUT=1mA VIN = VCE = 5.0V, VFB = 0.64, Short Lx at 1Ω resistance (*7) VIN = VCE =5.0V, The VFB at Lx=”Low" (*11) while decreasing FB pin voltage from 0.4V. Efficiency (*2) EFFI 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) Current Limit (*10) Output Voltage Temperature Characteristics RLｘH RLｘH RLｘL RLｘL ILEAKH ILIM △VOUT/ (VOUT・△Topr) CE "H" Voltage VCEH CE "L" Voltage VCEL PWM "H" Level Voltage VPWMH PWM "L" Level Voltage VPWML CE "H" Current CE "L" Current Soft Start Time (D series) Soft Start Time (F series) ICEH ICEL Latch Time tLAT Short Protection Threshold Voltage VSHORT CL Discharge RDCHG tSS VCE= VIN =2.2V IOUT=1mA VIN = 5.0V ,LX = 5.0V ,VCE = 0V ,VFB= open 200 300 % ① 100 - - % ③ - - 0 % ③ - 86 - % ① 900 0.35 0.42 0.45 0.52 0.01 1050 0.55 0.67 0.65 0.77 1.0 1350 Ω Ω Ω Ω μA mA ④ ④ ⑨ ⑥ - ±100 - ppm/ ℃ ① 0.65 - 6.0 V ③ VSS - 0.25 V ③ - - VIN - 1.0 V ① VIN 0.25 - - V ① - 0.1 - 0.1 0.5 - 1.0 0.25 0.1 0.1 2.5 0.40 μA μA ⑤ ⑤ ms ① 1.0 - 20.0 ms ⑦ 0.15 0.200 0.25 V ⑦ 200 300 450 Ω ⑧ Test conditions: VOUT=1.2V when the external components are connected. 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 VFB 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/XC9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions. 11/40 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) ●PFM Switching Current (IPFM) by Oscillation Frequency and Setting Voltage (mA) SETTING VOLTAGE VOUT(E) ≦1.2V 1.2V＜VOUT(E) ≦1.75V 1.8V≦VOUT(E) MIN. 1.2MHz TYP. MAX. 140 130 120 180 170 160 240 220 200 MIN. 3.0MHz TYP. MAX. 190 180 170 260 240 220 350 300 270 ●Input Voltage (VIN) for Measuring PFM Duty Limit (DTYLIMIT_PFM) fOSC C-1 1.2MHz VOUT(E)+0.5V 3.0MHz VOUT(E)+1.0V Minimum operating voltage is 2.0V. ex.) Although when VOUT(E) is 1.2V and fOSC is 1.2MHz, (C-1) should be 1.7V, (C-1) becomes 2.0V for the minimum operating voltage 2.0V. ●Soft-Start Time, Setting Voltage（XC9235B(G)/XC9236B(G)/XC9237B(G) Series only） SERIES XC9235B(G)/XC9237B(G) XC9236B(G) XC9235B(G)/ XC9236B(G)/XC9237B(G) 12/40 (μs) fOSC SETTING VOLTAGE MIN. TYP. MAX. 1.2MHz 1.2MHz 0.8≦V OUT(E)