XC9237C2ADER-G

XC9235/XC9236/XC9237 Series ETR05014-017a 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters ☆Green Operation Compatible ■GENERAL DESCRIPTION The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC ☆GreenOperation converters with a built-in 0.42Ω PCompatible channel MOS driver transistor and 0.52Ω N-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 turnon. With the built-in UVLO 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 ■FEATURES ●Smart phones / Mobile phones ●Bluetooth ●Mobile devices / terminals ●Portable game consoles ●Digital still cameras / Camcorders ●Note PCs / Tablet PCs Driver Transistor Built-In Input Voltage Output Voltage High Efficiency Output Current Oscillation Frequency Maximum Duty Cycle Control Methods ■APPLICATIONS ●Mobile phones, Smart phones ●Bluetooth headsets ■TYPICAL APPLICATION CIRCUIT ●Mobile WiMAX PDAs, MIDs, UMPCs ●Portable game consoles ●XC9235/XC9236/XC9237 ●XC9235/9236/9237 ●XC9235/9236/9237 ●Digital cameras, Camcorders A/B/C/E/G types (Output Voltage Fixed) 　A,B,C,E,Gシリーズ(出力電圧固定品) 　A,B,C,E,Gシリーズ(出力電圧固定品) ●MP3 Players, LPortable Media Players VOUT VOUT 600mA VIN L ●XC9235/XC9236/XC9237 ●Notebook computers 600mA Lx VIN VIN Lx A/B/C/E/G types (Output Voltage Fixed) VIN VSS VSS VSS VSS CL CL (ceramic) (ceramic) VOUT VOUT : 0.42Ω P-ch driver transistor 0.52Ω N-ch switch transistor : 2.0V ~ 6.0V (A/B/C types) 1.8V ~ 6.0V (D/E/F/G types) : 0.8V ~ 4.0V (Internally set) 0.9V ~ 6.0V (Externally set) : 92% (TYP.)* : 600mA : 1.2MHz, 3.0MHz (+15%) : 100% : PWM (XC9235) PWM/PFM Auto (XC9236) PWM/PFM Manual (XC9237) : 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) : Low ESR Ceramic Capacitor :-40℃ ~ 85℃ : SOT-25 (A/B/C types only) USP-6C USP-6EL (A/B/C/G types only) WLP-5-03 (A/B types only) : EU RoHS Compliant, Pb Free Function Capacitor Operating Ambient Temperature Packages CIN CIN (ceramic) (ceramic) CE/ CE/ MODE MODE CE/MODE CE/MODE Environmentally Friendly * Performance depends on external components and wiring on the PCB. ■TYPICAL PERFORMANCE CHARACTERISTICS Input Voltage: VIN (V) ●Efficiency vs. Output Current (fOSC=1.2MHz, VOUT=1.8V) ●XC9235/XC9236/XC9237 ●XC9235/9236/9237 ●XC9235/9236/9237 D/F types (Output Voltage Externally Set) 　D,Fシリーズ(出力電圧外部設定品) 100 　D,Fシリーズ(出力電圧外部設定品) CL CL (ceramic) (ceramic) L L CFB CFB RFB1 RFB1 Lx Lx VSS VSS FB FB RFB2 RFB2 VIN VIN VSS VSS CE/ CE/ MODE MODE VIN VIN ■TYPICAL 80PERFORMANCE CHARACTERISTICS Efficiency: EFFI (%) Efficency:EFFI(%) VOUT VOUT 600mA 600mA PWM/PFM Automatic Sw itching Control 90 VIN= 4.2V 70 ●Efficiency vs. Output Current（f VOUT =1.8V） OSC=1.2MHz,PWM Control 3.6V 60 CIN CIN (ceramic) (ceramic) CE/MODE CE/MODE 50 VIN= 4.2V 3.6V 2.4V 2.4V 40 30 20 10 0 0.1 1 10 100 1000 Output Current:IOUT(mA) 1/33 XC9235/XC9236/XC9237 Series ■BLOCK DIAGRAM ●XC9235 / XC9236 / XC9237 A Series ●XC9235 / XC9236 /Phase XC9237 Compensation CFB AVOUT Series R2 Error Amp. FB VIN Series Logic R3 Error Amp. Logic R1 UVLO VSS R4 CE/MODE CE/ R3 UVLO R4 Ramp Wave Generator OSC CE/MODE Control Logic ●XC9235 / XC9236 / XC9237 D/F Series ●XC9235 / XC9236 /Phase XC9237 Compensation A FB Series Error Amp. FB VIN Logic Synch Buffer Drive Lx VSHORT Vref with Soft Start, CE PWM/PFM 　Selector CE/ UVLO Cmp VSS Current Feedback Current Limit PWM Comparator R3 R4 UVLO Ramp Wave Generator OSC CE/MODE Control Logic CE/MODE 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. 2/33 Lx PWM/PFM 　Selector UVLO Cmp CE/MODE Control Logic Synch Buffer Drive VSHORT Vref with Soft Start, CE PWM/PFM 　Selector Ramp Wave Generator OSC PWM Comparator FB Lx VIN UVLO Cmp VSS Synch Buffer Drive Current Feedback Current Limit CFB R2 VSHORT Vref with Soft Start, CE Phase Compensation VOUT Current Feedback Current Limit PWM Comparator R1 ●XC9235 / XC9236 / XC9237 B/C/E/G CE/MODE 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 PWM / 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-G SOT-25(*2) (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) 3/33 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 (Top View) USP-6C (BOTTOM VIEW) CE/MODE 1 4 VOUT 5 * Please short the VSS pin (No. 2 and 5). * The dissipation pad for the USP-6C/USP-6EL packages should be solderplated 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. Lx 3 VSS VIN 2 USP-6EL (BOTTOM VIEW) WLP-5-03 WLP-5-01 (BOTTOM VIEW) (BOTTOM VIEW) ■PIN ASSIGNMENT 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 ■FUNCTION CE/MODE H Level (*1) L Level (*2) OPERATIONAL STATES XC9235 XC9236 Synchronous PWM Fixed Control Synchronous PWM/PFM Automatic Switching Stand-by Stand-by CE/MODE H Level (*3) M Level (*4) L Level (*5) CE/MODE pin voltage level range (*1) H Level ： VIN 0.65V ≦ H Level ≦ 6.0V (*2) L Level ： 0V ≦ L Level ≦ 0.25V (*3) H Level ： VIN - 0.25V ≦ H Level ≦ 6.0V (*4) M Level ： 0.65V ≦ M Level ≦ VIN - 1.0V (*5) L Level ： 0V ≦ L Level ≦ 0.25V (*6) For XC9235 / XC9236 / XC9237B ~ G types, the internal resistance turns on during standby. Discharge the CL charge through the CL discharge resistor. (*7) Please do not leave the CE/MODE pin open. 4/33 OPERATIONAL STATES XC9237 Synchronous PWM/PFM Automatic Switching Synchronous PWM Fixed Control Stand-by XC9235/XC9236/XC9237 Series ■ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT VIN Pin Voltage Lx Pin Voltage VOUT Pin Voltage FB Pin Voltage CE/MODE Pin Voltage Lx Pin Current VIN VLX VOUT VFB -0.3 ~ 6.5 -0.3 ~ VIN + 0.3 -0.3 ~ 6.5 -0.3 ~ 6.5 -0.3 ~ 6.5 ±1500 250 (IC only) 600 (40mm x 40mm Standard board) (*1) 760 (JESD51-7 board) (*1) 120 (IC only) 1000 (40mm x 40mm Standard board) (*1) 1250 (JESD51-7 board) (*1) 120 (IC only) 1000 (40mm x 40mm Standard board) (*1) 750 (40mm x 40mm Standard board) (*1) -40 ~ 85 -55 ~ 125 V V V V V mA VCE/MODE ILx SOT-25 Power Dissipation (Ta=25℃) USP-6C Pd USP-6EL WLP-5-03 Operating Ambient Temperature Storage Temperature (*1) Topr Tstg mW O O C C The power dissipation figure shown is PCB mounted and is for reference only. Please refer to PACKAGING INFORMATION for the mounting condition. 5/33 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS XC9235A18Cxx/XC9236A18Cxx/XC9237A18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃ ■ELECTRICAL CHARACTERISTICS 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)×1.1 - 15 33 μA ② Stand-by Current ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1 - 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 VCE=VIN=(C-1), IOUT=1mA (*12) PFM Duty Limit DTYLIMIT_PFM Maximum Duty Cycle DMAX VIN=VCE=5.0V, VOUT=VOUT(E)×0.9 200 300 % ① 100 - - % Minimum Duty Cycle DMIN ③ - - 0 % ③ - 92 - % ① - 0.35 0.55 Ω ④ - 0.42 0.67 Ω ④ (*4) ④ Lx SW "H" ON Resistance 1 RLxH VIN=VCE=5.0V, VOUT=VOUT(E)×1.1 When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) Lx SW "H" ON Resistance 2 RLxH VIN=VCE=3.6V, VOUT=0V, ILx=100mA (*3) Efficiency (*2) EFFI Lx SW "L" ON Resistance 1 RLxL VIN=VCE=5.0V - 0.45 0.65 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 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)×0.9 (*8) △VOUT/ IOUT=30mA, -40℃≦Topr≦85℃ (VOUT・△Topr) VOUT =VOUT(E)ｘ0.9, Applied voltage to VCE, VCEH Voltage changes Lx to “H” level (*11) VOUT =VOUT(E)ｘ0.9, 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= VOUT(E)×0.9 VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9 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, 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. Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. 6/33 *2: EFFI = { ( output voltage × output current ■ TYPICAL PERFORMANCE XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9235A18Dxx/XC9236A18Dxx/XC9237A18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃ ■ELECTRICAL CHARACTERISTICS (Continued) 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)×1.1 - 21 35 μA ② Stand-by Current ISTB VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1 - 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)×0.9 Minimum Duty Cycle DMIN Efficiency (*2) EFFI VIN=VCE=5.0V, VOUT=VOUT(E)×1.1 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)×0.9 (*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 =VOUT(E)ｘ0.9, Applied voltage to VCE, CE "H" Voltage VCEH Voltage changes Lx to “H” level (*11) VOUT =VOUT(E)ｘ0.9, 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= VOUT(E)×0.9 VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9 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, 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. 7/33 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)×0.5 (*14) Voltage which Lx pin holding “L” level (*1, *11) VIN=VCE=5.0V, VOUT=VOUT(E)×1.1 VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1 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)×0.9 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)×1.1 When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT (E)×0.9, ILx=100mA (*3) - 0.35 0.55 Ω ④ Lx SW "H" ON Resistance 2 RLxH VIN=VCE=3.6V, VOUT (E)×0.9, 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 (*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 VIN=VCE=3.6V ILIM VIN=VCE=5.0V, VOUT=VOUT(E)×0.9 (*8) △VOUT/ I =30mA, -40℃≦Topr≦85℃ (VOUT・△Topr) OUT VOUT= VOUT(E)×0.9, Applied voltage to VCE, VCEH Voltage changes Lx to “H” level (*11) VOUT= VOUT(E)×0.9, 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)×0.9 VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9 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)×0.4 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. 8/33 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)×0.5 (*14), Voltage which Lx pin holding “L” level (*1,*11) VIN=VCE=5.0V, VOUT=VOUT(E)×1.1 VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1 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)×0.9 Minimum Duty Cycle DMIN VIN=VCE=5.0V, VOUT=VOUT(E)×1.1 When connected to external components, VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9, ILx=100mA (*3) VIN=VCE=3.6V, VOUT=VOUT(E)×0.9, 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)×0.9 (*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)×0.4 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)×0.9 VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9 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. 9/33 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 VIN = VCE =5.0V, The VFB at Lx=”High" decreasing FB pin voltage from 0.9V. (*11) 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=0.64V, 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. 10/33 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 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 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 = 0.64V, 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 (*12) 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. 11/33 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) fOSC SETTING VOLTAGE MIN. ●Soft-StartSERIES Time, Setting Voltage（XC9235B(G)/XC9236B(G)/XC9237B(G) SeriesTYP. only） XC9235B(G)/XC9237B(G) XC9236B(G) XC9235B(G)/ XC9236B(G)/XC9237B(G) 12/33 (μs) MAX. 1.2MHz 1.2MHz 0.8≦V OUT(E)