XC9237A2ADML

XC9235/XC9236/XC9237 Series 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters ETR0514-007 The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω P-channel driver transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of 50mV (accuracy: ±2.0%). With the built-in oscillator, ether 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. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower. The XC9235B/XC9236B/XC9237B series provide short-time turn-on by the soft start function internally set in 0.25 ms (TYP). The XC9235B(C)/XC9236B(C)/XC9237B(C) integrate CL auto discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal auto-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. Two types of package SOT-25 and USP-6C are available. ■GENERAL DESCRIPTION ☆GreenOperation Compatible ■APPLICATIONS ●Mobile phones ●Bluetooth equipment ●PDAs, portable communication modem ●Portable games ●Digital cameras, video cameras ●Cordless phones ●Notebook computers ■FEATURES P-ch Driver Transistor Built-In N-ch Driver Transistor Built-In Input Voltage Output Voltage High Efficiency Output Current Oscillation Frequency Maximum Duty Cycle Control Methods : ON resistance 0.42Ω : ON resistance 0.52Ω : 2.0V ~ 6.0V : 0.8V ~ 4.0V : 92% (TYP.) : 600mA : 1.2MHz, 3.0MHz (+15%) : 100% : PWM (XC9235) PWM/PFM Auto (XC9236) PWM/PFM Manual (XC9237) Soft-Start Circuit Built-In Current Limiter Circuit Built-In (Constant Current & Latching) Low ESR Ceramic Capacitor Compatible Packages : SOT-25, USP-6C CL High Speed Discharge （XC9235B(C)/XC9236B(C)/XC9237B(C) Series） High Speed Soft Start （XC9235B/XC9236B/XC9237B Series） * Performance depends on external components and wiring on the PCB. ■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE CHARACTERISTICS ●Efficiency vs. Output Current（FOSC=1.2NHz, VOUT=1.8V） 100 90 80 Efficiency: EFFI (%) ) Efficency:EFFI(% PWM/PFM Automatic Sw itching Control 70 60 50 40 30 20 10 0 0.1 2.4V VIN= 4.2V 3.6V PWM Control VIN= 4.2V 3.6V 2.4V 1 10 100 1000 Output Current:IOUT(mA) 1/28 XC9235/XC9236/XC9237 Series ■PIN CONFIGURATION Lx VOUT 5 4 VIN VSS CE/MODE 6 5 4 1 2 3 Lx VSS VOUT * Please short the VSS pin (No. 2 and 5). * The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release. If the pad needs to be connected to other pins, it should be connected to the VSS (No. 5) pin. 1 VIN 2 VSS 3 CE/MODE SOT-25 (Top View) USP-6C (BOTTOM VIEW) ■PIN ASSIGNMENT PIN NUMBER SOT-25 USP-6C 1 6 2 2, 5 3 4 4 3 5 1 PIN NAME VIN VSS CE / MODE VOUT Lx FUNCTION Power Input Ground Chip Enable Mode Switch Output Voltage Sense Switching Output ■PRODUCT CLASSIFICATION ●Ordering Information XC9235①②③④⑤⑥ XC9236①②③④⑤⑥ XC9237①②③④⑤⑥ DESIGNATOR PWM fixed control PWM / PFM automatic switching control PWM fixed control PWM / PFM automatic switching, manual switching SYMBOL A B C 0~4 DESCRIPTION : CE input logic High Active : CE input logic High Active, high speed soft start, CL discharge : CE input logic High Active, CL discharge : Integer number of output voltage e.g. VOUT=2.8V→②=2, VOUT=3.3V→②=3 : Decimal number of output voltage 50mV 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 e.g. VOUT=2.8V→②=2, ③=8 VOUT=2.85V→②=2, ③=L : 1.2MHz : 3.0MHz : SOT-25 (SOT-23-5) : USP-6C : Embossed tape, standard feed : Embossed tape, reverse feed DESCRIPTION Transistor built-in, Output voltage internally set (VOUT product), Soft-start internally set Output Voltage ①. ② ③ Output Voltage 0~9, A~M ④ Oscillation Frequency Packages C D M E R L ⑤ ⑥ Device Orientation 2/28 XC9235/XC9236/XC9237 Series ■BLOCK DIAGRAM ●XC9235A / XC9236A / XC9237A ●XC9235B(C) / XC9236B(C) / XC9237B(C) 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 VIN Pin Voltage Lx Pin Voltage VOUT Pin Voltage CE / MODE Pin Voltage Lx Pin Current Power Dissipation SOT-25 (*Ta=25℃) USP-6C Operating Temperature Range Storage Temperature Range SYMBOL VIN VLx VOUT VCE ILx Pd Topr Tstg RATINGS - 0.3 ~ 6.5 - 0.3 ~ VIN + 0.3 or 6.5V - 0.3 ~ 6.5 - 0.3 ~ 6.5 ±1500 250 100 - 40 ~ + 85 - 55 ~ + 125 UNIT V V V V mA mW O O C C 3/28 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS XC9237A18Cxx, VOUT=1.8V, FOSC=1.2MHz, Ta=25℃ PARAMETER Output Voltage Operating Voltage Range Maximum Output Current U.V.L.O. Voltage Supply Current Stand-by Current Oscillation Frequency PFM Switching Current Maximum IPFM Limit Maximum Duty Cycle Minimum Duty Cycle Efficiency (*2) SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB FOSC IPFM MAXIPFM MAXDTY MINDTY EFFI CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA MIN. 1.764 TYP. MAX. UNIT CIRCUIT V V mA V μA μA kHz mA % % % % Ω Ω Ω Ω μA μA mA ppm/℃ V V V ① ① ① ② ③ ③ ① ① ① ② ② ① ④ ④ ④ ⑤ ⑤ ⑥ ① ③ ③ ① 1.800 1.836 1.40 15 0 1200 160 200 92 0.35 0.42 0.45 0.52 0.01 0.01 1050 ±100 6.0 1.78 33 1.0 1380 200 0 0.55 0.67 0.66 0.77 1.0 1.0 1350 VIN 0.25 VIN 1.0 0.1 0.1 2.5 20.0 RLxH RLxH RLxL RLxL ILeakH ILeakL ILIM △VOUT I =30mA, -40℃≦Topr≦85℃ Temperature Characteristics VOUT・△topr OUT VOUT=0V, Applied voltage to VCE, CE "H" Voltage VCEH (*11) Voltage changes Lx to “H” level VOUT=0V, Applied voltage to VCE , CE "L" Voltage VCEL Voltage changes Lx to “L” level (*11) When connected to external components, IOUT=1mA (*6), Voltage which oscillation PWM "H" Level Voltage VPWMH frequency becomes 1020 kHz≦FOSC≦ (*13) 1380kHz When connected to external components, PWM "L" Level Voltage VPWML IOUT=1mA (*6), Voltage which oscillation frequency becomes FOSC＜1020kHz (*13) CE "H" Current ICEH VIN=VCE=5.0V, VOUT=0V CE "L" Current ICEL VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, Soft Start Time TSS VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Latch Time TLAT (*7) Short Lx at 1Ω resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at Short Protection VSHORT 1Ω resistance, VOUT voltage which Lx Threshold Voltage becomes “L” level within 1ms 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) Lx SW "L" Leak Current (*5) Current Limit (*10) Output Voltage 2.0 VIN=VOUT(E)+2.0V, VCE=1.0V, 600 When connected to external components (*9) VCE =VIN, VOUT=0V, 1.00 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, 1020 VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA When connected to external components, 120 (*12) VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA (*12) VCE=VIN=(C-1), IOUT=1mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V 100 VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILx=100mA 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) 900 0.65 VSS VIN – 0.25 - 0.1 - 0.1 0.5 1.0 1.0 - V μA μA ms ms V ① ⑤ ⑤ ① ⑦ ⑦ 0.675 0.900 1.150 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. 4/28 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9237A18Dxx, VOUT=1.8V, FOSC=3.0MHz, Ta=25℃ PARAMETER Output Voltage Operating Voltage Range Maximum Output Current U.V.L.O. Voltage Supply Current Stand-by Current Oscillation Frequency PFM Switching Current Maximum IPFM Limit Maximum Duty Cycle Minimum Duty Cycle 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) Lx SW "L" Leak Current (*5) Current Limit (*10) Output Voltage SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB FOSC IPFM MAXIPFM MAXDTY MINDTY EFFI CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA MIN. 1.764 TYP. MAX. UNIT CIRCUIT V V mA V μA μA kHz mA % % % % Ω Ω Ω Ω μA μA mA ppm/℃ V V V ① ① ① ③ ② ② ① ① ① ③ ③ ① ④ ④ ⑤ ⑤ ⑥ ① ③ ③ ① 1.800 1.836 1.40 21 0 3000 220 200 86 0.35 0.42 0.45 0.52 0.01 0.01 1050 ±100 6.0 1.78 35 1.0 3450 270 300 0 0.55 0.67 0.66 0.77 1.0 1.0 1350 VIN 0.25 VIN 1.0 0.1 0.1 3.0 20 RLxH RLxH RLxL RLxL ILeakH ILeakL ILIM △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 (*11) Voltage changes Lx to “L” level When connected to external components, IOUT=1mA (*6), Voltage which oscillation PWM "H" Level Voltage VPWMH frequency becomes 2550kHz≦FOSC≦ 3450kHz (*13) When connected to external components, PWM "L" Level Voltage VPWML IOUT=1mA (*6), Voltage which oscillation frequency becomes FOSC＜2550kHz (*13) CE "H" Current ICEH VIN=VCE=5.0V, VOUT=0V CE "L" Current ICEL VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, Soft Start Time TSS VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Latch Time TLAT Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at Short Protection 1Ω resistance, VOUT voltage which Lx VSHORT Threshold Voltage becomes “L” level within 1ms (*4) 2.0 VIN=VOUT(E)+2.0V, VCE=1.0V, 600 When connected to external components (*9) VCE=VIN, VOUT=0V, 1.00 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, 2550 VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA When connected to external components, 170 VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12) (*12) VCE=VIN=(C-1), IOUT=1mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V 100 VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V When connected to external components, VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT =0V, ILx=100mA 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) 900 0.65 VSS VIN – 0.25 - 0.1 - 0.1 0.5 1.0 0.9 - V μA μA ms ms V ① ⑤ ⑤ ① ⑦ ⑦ 0.675 0.900 1.150 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. 5/28 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9237B(C)18Cxx, VOUT=1.8V, FOSC=1.2MHz, Ta=25℃ PARAMETER Output Voltage Operating Voltage Range Maximum Output Current U.V.L.O. Voltage Supply Current Stand-by Current Oscillation Frequency PFM Switching Current Maximum IPFM Limit Maximum Duty Cycle Minimum Duty Cycle Efficiency (*2) 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 SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB FOSC IPFM MAXIPFM MAXDTY MINDTY EFFI CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA MIN. 1.764 TYP. MAX. UNIT CIRCUIT V V mA V μA μA kHz mA % % % % Ω Ω Ω Ω μA mA ppm/℃ V V V ① ① ① ② ③ ③ ① ① ① ② ② ① ④ ④ ④ ⑤ ⑥ ① ③ ③ ① 1.800 1.836 1.40 15 0 1200 160 200 92 0.35 0.42 0.45 0.52 0.01 1050 ±100 6.0 1.78 33 1.0 1380 200 0 0.55 0.67 0.66 0.77 1.0 1350 VIN 0.25 VIN 1.0 0.1 0.1 0.40 2.5 20.0 RLxH RLxH RLxL RLxL ILeakH ILIM △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) When connected to external components, PWM "H" Level Voltage VPWMH IOUT=1mA (*6), Voltage which oscillation frequency becomes 1020 kHz≦FOSC≦1380kHz (*13) PWM "L" Level Voltage CE "H" Current CE "L" Current Soft Start Time (B Series) Soft Start Time (C Series) Latch Time Short Protection Threshold Voltage CL Discharge VPWML ICEH ICEL TSS TSS TLAT VSHORT Rdischg 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 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=5.0V, LX=5.0V, VCE=0V, VOUT=open 2.0 VIN=VOUT(E)+2.0V, VCE=1.0V, 600 When connected to external components (*9) VCE =VIN, VOUT=0V, 1.00 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, 1020 VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA When connected to external components, 120 VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA (*12) (*12) VCE=VIN=(C-1), IOUT=1mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V 100 VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILx=100mA 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) 900 0.65 VSS VIN – 0.25 - 0.1 - 0.1 0.5 1.0 0.25 1.0 - V μA μA ms ms ms V Ω ① ⑤ ⑤ ① ① ⑦ ⑦ ⑧ 0.675 0.900 1.150 200 300 450 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. 6/28 XC9235/XC9236/XC9237 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9237B(C)18Dxx, VOUT=1.8V, FOSC=3.0MHz, Ta=25℃ PARAMETER Output Voltage Operating Voltage Range Maximum Output Current U.V.L.O. Voltage Supply Current Stand-by Current Oscillation Frequency PFM Switching Current Maximum IPFM Limit Maximum Duty Cycle Minimum Duty Cycle 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 SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB FOSC IPFM MAXIPFM MAXDTY MINDTY EFFI CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA MIN. 1.764 TYP. MAX. UNIT CIRCUIT V V mA V μA μA kHz mA % % % % Ω Ω Ω Ω μA mA ppm/℃ V V V ① ① ① ③ ② ② ① ① ① ③ ③ ① ④ ④ ⑤ ⑥ ① ③ ③ ① 1.800 1.836 1.40 21 0 3000 220 200 86 0.35 0.42 0.45 0.52 0.01 1050 ±100 6.0 1.78 35 1.0 3450 270 300 0 0.55 0.67 0.66 0.77 1.0 1350 VIN 0.25 VIN 1.0 0.1 0.1 0.50 2.5 20 RLxH RLxH RLxL RLxL ILeakH ILIM △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) When connected to external components, IOUT=1mA (*6), Voltage which oscillation PWM "H" Level Voltage VPWMH frequency becomes 2550kHz≦FOSC≦ 3450kHz (*13) When connected to external components, (*6) IOUT=1mA , Voltage which oscillation PWM "L" Level Voltage VPWML frequency becomes FOSC＜2550kHz (*13) CE "H" Current ICEH VIN=VCE=5.0V, VOUT=0V CE "L" Current ICEL VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, Soft Start Time (B Series) TSS VCE=0V → VIN, IOUT=1mA When connected to external components, Soft Start Time (C Series) TSS VCE=0V → VIN, IOUT=1mA VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Latch Time TLAT Short Lx at 1Ω resistance (*7) Sweeping VOUT, VIN=VCE=5.0V, Short Lx at Short Protection VSHORT 1Ω resistance, VOUT voltage which Lx Threshold Voltage becomes “L” level within 1ms VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open CL Discharge Rdischg 2.0 VIN=VOUT(E)+2.0V, VCE=1.0V, 600 When connected to external components (*9) VCE=VIN, VOUT=0V, 1.00 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, 2550 VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA When connected to external components, 170 (*12) VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12) VCE=VIN=(C-1), IOUT=1mA VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V 100 VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V When connected to external components, VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT =0V, ILx=100mA 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=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) 900 0.65 VSS VIN – 0.25 - 0.1 - 0.1 0.5 1.0 0.32 0.9 - V μA μA ms ms ms V Ω ① ⑤ ⑤ ① ① ⑦ ⑦ ⑧ 0.675 0.900 1.150 200 300 450 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. 7/28 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. 140 130 120 1.2MHz TYP. 180 170 160 MAX. 240 220 200 MIN. 190 180 170 3.0MHz TYP. 260 240 220 MAX. 350 300 270 ●Input Voltage (VIN) for Measuring Maximum PFM Switching Current (MAXIPFM) Limit FOSC C-1 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. 1.2MHz VOUT(E)+0.5V 3.0MHz VOUT(E)+1.0V ●Soft-Start Time, Setting Voltage（XC9235B/36B/37B Series only） SERIES FOSC 1200kHz XC9235B/XC9237B 1200kHz 1200kHz 1200kHz XC9236B XC9235B/ XC9236B/XC9237B 1200kHz 1200kHz 3000kHz 3000kHz SETTING VOLTAGE 0.8≦V OUT(E) VIN CE/ MODE Lx ILx A 1μF VOUT VSS Rpulldown 1Ω 1uF VOUT VSS < Circuit No.9 > Circuit ⑨ A CIN VIN CE/ MODE Lx VOUT VSS 17/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (1) Efficiency vs. Output Current 100 90 80 Efficiency: EFFI (%) ) Efficency:EFFI(% Efficiency: EFFI (%) ) Efficency:EFFI(% XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF PWM/PFM Automatic Sw itching Control 100 90 80 XC9237A18D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF PWM/PFM Automatic Sw itching Control 70 60 50 40 30 20 10 0 0.1 VIN= 4.2V 3.6V 2.4V PWM Control VIN= 4.2V 3.6V 2.4V 70 60 50 40 30 20 10 0 2.4V VIN= 4.2V 3.6V PWM Control VIN= 4.2V 3.6V 2.4V 1 10 100 1000 0.1 1 10 100 1000 Output Current:IOUT(mA) Output Current: IOUT (mA) OOutput Current:IOUT(mA) utput Current: IOUT (mA) (2) Output Voltage vs. Output Current XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF 2.1 2.0 OutputVoltage: VOUT (V) Output Voltage:Vout(V) 1.9 1.8 1.7 PWM Control 1.6 1.5 0.1 1 10 Output Current: IOUT (mA) XC9237A18D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF 2.1 2.0 PWM/PFM Automatic Sw itching Control VIN＝4.2V,3.6V,2.4V Output Voltage:Vout(V) 1.9 1.8 1.7 1.6 1.5 PWM/PFM Automatic Sw itching Control VIN＝4.2V,3.6V,2.4V PWM Control 100 1000 0.1 1 10 Output Current: IOUT (mA) 100 1000 Output Current:IOUT(mA) Output Current:IOUT(mA) (3) Ripple Voltage vs. Output Current XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF XC9237A18D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF 100 100 80 Ripple Voltage: Vr (mV) Ripple Voltage:Vr(mV) Ripple Voltage: Vr (mV) Ripple Voltage:Vr(mV) 80 60 PWM Control VIN＝4.2V,3.6V,2.4V 40 PWM/PFM Automatic Sw itching Control VIN＝4.2V 3.6V 　　2.4V 60 40 PWM/PFM Automatic PWM Control VIN＝4.2V,3.6V,2.4V Sw itching Control VIN＝4.2V 3.6V 　　2.4V 20 20 0 0.1 1 10 100 1000 Output Current: IOUT (mA) Output Current:IOUT(mA) 0 0.1 1 10 100 1000 Output Current: IOUT (mA) Output Current:IOUT(mA) 18/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (4) Oscillation Frequency vs. Ambient Temperature XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF Oscillation Frequency: : FOSC(MHz) Oscillation Frequency FOSC (MHz) XC9237A18D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -50 -25 0 25 50 75 100 VIN=3.6V 1.5 Oscillation Frequency : FOSC(MHz) Oscillation Frequency: FOSC (MHz) 1.4 1.3 1.2 1.1 1.0 0.9 0.8 -50 -25 0 25 50 75 100 VIN=3.6V Ambient Temperature:Ta (℃) ) Ambient Temperature: Ta ( ℃ Ambient Temperature: Ta () ) Ambient Temperature: Ta (℃ ℃ (5) Supply Current vs. Ambient Temperature XC9237A18C 40 35 Supply Current : IDD ( μ Supply Current: IDD (μA) A) XC9237A18D 40 35 Supply Current : IDD (μ Supply Current: IDD (μA) A) VIN=6.0V 30 25 20 15 10 5 0 -50 VIN=2.0V VIN=6.0V VIN=4.0V 30 25 20 15 10 5 0 -50 VIN=2.0V VIN=4.0V -25 0 25 50 75 100 -25 0 25 50 75 100 Ambient Temperature: Ta ( ( ) Ambient Temperature: Ta℃℃) Ambient Temperature: Ta (℃℃ Ambient Temperature: Ta () ) (6) Output Voltage vs. Ambient Temperature XC9237A18D 2.1 2.0 Output Voltage :VOUT (V) Output Voltage: VOUT (V) 1.9 1.8 1.7 1.6 1.5 -50 -25 0 25 50 75 100 Ambient Temperature: Ta () ) Ambient Temperature: Ta (℃℃ UVLO Voltage: UVLO (V) UVLO Voltage : UVLO (V) (7) UVLO Voltage vs. Ambient Temperature XC9237A18D 1.8 CE=VIN 1.5 1.2 0.9 0.6 0.3 0.0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta℃℃) Ambient Temperature: Ta ( ( ) VIN=3.6V 19/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (8) CE "H" Voltage vs. Ambient Temperature XC9237A18D 1.0 CE "H" Voltage : VCEH (V) 0.9 CE “L” Voltage: : VCEL (V) CE "L" Voltage VCEL (V) (9) CE "L" Voltage vs. Ambient Temperature XC9237A18D 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 VIN=2.4V VIN=3.6V VIN=5.0V 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 75 100 Ambient Temperature:Ta (℃) ) Ambient Temperature: Ta ( ℃ VIN=2.4V VIN=3.6V VIN=5.0V CE “H” Voltage: VCEH (V) -50 -25 0 25 50 75 100 Ambient Temperature: Ta (℃)℃) Ambient Temperature: Ta ( (10) Soft Start Time vs. Ambient Temperature XC9237A18C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF 5 5 XC9237A18D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF Soft Start Time: TSS (ms) ) Soft Start Time : TSS (ms 3 Soft Start Time: : TSS (ms Soft Start Time TSS (ms) ) 4 4 3 2 VIN=3.6V 2 VIN=3.6V 1 1 0 -50 -25 0 25 50 75 100 0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta (℃℃ Ambient Temperature: Ta () ) Ambient Temperature: (℃ Ambient Temperature: TaTa ()℃) (11) "Pch / Nch" Driver on Resistance vs. Input Voltage XC9237A18D LLx SW ON Resistance:RLxH,RLxL ( Ω) x SW ON Resistance: RLxH, RLxL (Ω) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 Input Voltage :VIN (V) Input Voltage: VIN (V) Pch on Resistance Nch on Resistance 20/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (12) XC9235B/36B/37B Rise Wave Form XC9237B12C L=4.7μH (NR4018), CIN=4.7μF, CL=10μF VIN=5.0V IOUT=1.0mA XC9237B33D L=1.5μH (NR3015), CIN=4.7μF, CL=10μF VIN=5.0V IOUT=1.0mA VOUT：0.5V/div VOUT：1.0V/div CE：0.0V⇒1.0V 100μs/div CE：0.0V⇒1.0V 100μs/div (13) XC9235B/36B/37B Soft-Start Time vs. Ambient Temperature XC9237B12C XC9237B33D L=1.5μH(NR3015), CIN=4.7μF, CL=10μF 500 L=4.7μH(NR4018), CIN=4.7μF, CL=10μF 500 Soft Start Time :TSS (μs) Soft Start Time :TSS (μs) 400 400 300 300 200 VIN=5.0V IOUT=1.0mA 200 VIN=5.0V IOUT=1.0mA 100 100 0 -50 -25 0 25 50 75 100 0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta(℃) Ambient Temperature: Ta(℃) (14) XC9235B/36B/37B 600 CL Discharge Resistance vs. Ambient Temperature XC9237B33D VIN=6.0V CL Discharge Resistance: (Ω) 500 VIN=4.0V VIN=2.0V 400 300 200 100 -50 -25 0 25 50 75 100 Ambient Temperature: Ta (℃) 21/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response XC9237A18C L=4.7μH (NR4018), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃ VIN=3.6V, VCE=VIN (PWM/PFM Automatic Switching Control) IOUT=1mA → 100mA IOUT=1mA → 300mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 50μs/div 50μs/div IOUT=100mA → 1mA IOUT=300mA → 1mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 200μs/div 2ch VOUT: 50mV/div 200μs/div 22/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response (Continued) XC9237A18C L=4.7μH (NR4018), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃ VIN=3.6V, VCE=1.8V (PWM Control) IOUT=1mA → 100mA IOUT=1mA → 300mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 50μs/div 50μs/div IOUT=100mA → 1mA IOUT=300mA → 1mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 200μs/div 200μs/div 23/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response (Continued) XC9237A18D L=1.5μH (NR3015), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃ VIN=3.6V, VCE=VIN (PWM/PFM Automatic Switching Control) IOUT=1mA → 100mA IOUT=1mA → 300mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 50μs/div 50μs/div IOUT=100mA → 1mA IOUT=300mA → 1mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 200μs/div 200μs/div 24/28 XC9235/XC9236/XC9237 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (15) Load Transient Response (Continued) XC9237A18D L=1.5μH (NR3015), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃ VIN=3.6V, VCE=1.8V (PWM Control) IOUT=1mA → 100mA IOUT=1mA → 300mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 50μs/div 50μs/div IOUT=100mA → 1mA IOUT=300mA → 1mA 1ch: IOUT 1ch: IOUT 2ch VOUT: 50mV/div 2ch VOUT: 50mV/div 200μs/div 200μs/div 25/28 XC9235/XC9236/XC9237 Series ■PACKAGING INFORMATION ●SOT-25 ●USP-6C ●USP-6C Recommended Pattern Layout ●USP-6C Recommended Metal Mask Design 26/28 XC9235/XC9236/XC9237 Series ■MARKING RULE ●SOT-25 & USP-6C ①Represent product series MARK 4 5 6 C D E K L M SOT-25 (TOP VIEW) ②Represents integer number of output voltage and oscillation frequency OUTPUT MARK VOLTAGE (V) FOSC =1.2MHz FOSC =3.0MHz 0.X 1.X 2.X 3.X 4.X A B C D E F H K L M PRODUCT SERIES XC9235A XC9236A XC9237A XC9235B XC9236B XC9237B XC9235C XC9236C XC9237C USP-6C (TOP VIEW) ③Represents decimal point of output voltage OUTPUT OUTPUT MARK VOLTAGE (V) VOLTAGE (V) X.00 0 X.05 X.10 1 X.15 X.20 2 X.25 X.30 3 X.35 X.40 4 X.45 X.50 5 X.55 X.60 6 X.65 X.70 7 X.75 X.80 8 X.85 X.90 9 X.95 MARK A B C D E F H K L M ④⑤Represents production lot number Order of 01, …09, 10, 11, …99, 0A, …0Z, 1A, …9Z, A0, …Z9, AA, …ZZ. (G, I, J, O, Q, W excepted) *No character inversion used. 27/28 XC9235/XC9236/XC9237 Series 1. The products and product specifications contained herein are subject to change without notice to improve performance characteristics. Consult us, or our representatives before use, to confirm that the information in this catalog is up to date. 2. We assume no responsibility for any infringement of patents, patent rights, or other rights arising from the use of any information and circuitry in this catalog. 3. Please ensure suitable shipping controls (including fail-safe designs and aging protection) are in force for equipment employing products listed in this catalog. 4. The products in this catalog are not developed, designed, or approved for use with such equipment whose failure of malfunction can be reasonably expected to directly endanger the life of, or cause significant injury to, the user. (e.g. Atomic energy; aerospace; transport; combustion and associated safety equipment thereof.) 5. Please use the products listed in this catalog within the specified ranges. Should you wish to use the products under conditions exceeding the specifications, please consult us or our representatives. 6. We assume no responsibility for damage or loss due to abnormal use. 7. All rights reserved. No part of this catalog may be copied or reproduced without the prior permission of Torex Semiconductor Ltd. 28/28