XC9272A0614R-G

XC9272 Series ETR05057-003 Ultra Low Quiescent Current Synchronous Step-Down PFM DC/DC Converter for Low Output Voltage ☆GreenOperation compatible ■GENERAL DESCRIPTION XC9272 series are Ultra Low Quiescent Current synchronous-rectification for Low Output Voltage type PFM step down DC/DC converters with a built-in 0.4Ω (TYP.) Pch driver and 0.4Ω (TYP.) Nch synchronous switching transistor, designed to allow the use of ceramic capacitor. PFM control enables a low quiescent current, making these products ideal for battery operated devices that require high efficiency and long battery life. Only inductor, CIN and CL capacitors are needed as external parts to make a step down DC/DC circuit. Operation voltage range is from 2.0V to 6.0V. This product has fixed output voltage from 0.6V to 0.95V(accuracy: ±20mV) in increments of 0.05V. During stand-by, all circuits are shutdown to reduce consumption to as low as 0.1μA(TYP.) or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage gets lower than UVLO detection voltage. Besides, XC9272 series has UVLO release voltage of 1.8V (Typ.). The product with CL discharge function, XC9272B type, can discharge CL capacitor during stand-by mode due to the internal resistance by turning on the internal switch between VOUT -GND. This enables output voltage restored to GND level fast. ■APPLICATIONS ■FEATURES ● Electric devices with GPS ● Wearable devices ● Energy Harvest devices ● Backup power supply circuits ● Devices with 1 Lithium cell Input Voltage Range : 2.0V~6.0V Output Voltage Setting : 0.6V~0.95V (±20mV, 0.05V step increments) Output Current : 50mA Driver Transistor : 0.4Ω (Pch Driver Tr) 0.4Ω (Nch Synchronous rectifier Switch Tr) Supply Current : 0.50μA @ VOUT(T)=0.7V (TYP.) Control Method : PFM control High Speed Transient PFM Switching Current : : 50mV (VIN=3.6V, VOUT=0.7V, IOUT=10μA→50mA) 180mA Function : Short Protection function CL Discharge(XC9272B type) UVLO function Ceramic Capacitor Compatible Operation Ambient Temperature : -40～+85℃ Package : SOT-25, USP-6EL Environmentally Friendly : EU RoHS compliant, Pb Free ■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE CHARACTERISTICS ●Efficiency vs. Output Current XC9272A071xR-G(VOUT=0.7V) L=10μH(VLF302512M-100M),CIN =10μF(LMK107BJ106MA), CL=22μF(JMK107BJ226MA) 100 CIN (Ceramic) L VIN LX VOUT CE GND VIN=2.0V VOUT CL (Ceramic) Ef f iciency : EFFI (%) VIN 80 60 VIN=3.6V 40 20 0 0.01 0.1 1 10 100 Output Current : I OUT (mA) 1/24 XC9272 Series ■ BLOCK DIAGRAM XC9272A Type PFM Comparator Unit VOUT CFB RFB1 Short protection RFB2 Current Sense PFM Comparator FB + CE CE Controller Logic PFM Controller Synch Buffer Driver VREF LX VDD GND UVLO VIN start up Controller VIN * Diodes inside the circuit are an ESD protection diode and a parasitic diode. XC9272B Type PFM Comparator Unit VOUT CFB RFB1 Short protection CL Discharge RFB2 Current Sense PFM Comparator FB + CE Controller Logic CE VREF PFM Controller Synch Buffer Driver LX VDD VIN UVLO VIN start up Controller * Diodes inside the circuit are an ESD protection diode and a parasitic diode. 2/24 GND XC9140 (Design Target) XC9272 Series ■PRODUCT CLASSIFICATION ●Ordering information XC9272①②③④⑤⑥-⑦ DESIGNATOR ① Product Type ②③ Output Voltage ④ Output Voltage Type ⑤⑥-⑦ (*1) ITEM (*1) Packages (Order Unit) SYMBOL DESCRIPTION A Without CL Discharge B With CL Discharge 06 ～ 09 Output Voltage : e.g. VOUT=0.7V⇒②=0, ③=7 Output Voltage Range: 0.6V～0.95V (0.05V step) 1 Output Voltage {x.x0V} (the 2nd decimal place is “0”) B 4R-G Output Voltage {x.x5V} (the 2nd decimal place is “5”) USP-6EL (3,000pcs/Reel) MR-G SOT-25 (3,000pcs/Reel) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. 3/24 XC9272 Series ■PIN CONFIGURATION LX VOUT 5 4 1 2 3 VIN GND CE VIN 6 1 LX NC 5 2 GND CE 4 3 VOUT USP-6EL (BOTTOM VIEW) SOT-25 (TOP VIEW) * The dissipation pad for the USP-6EL package should be solder-plated in reference mount pattern and metal masking so as to enhance mounting strength and heat release. The mount pattern should be connected to GND pin (No.2). ■PIN ASSIGNMENT PIN NUMBER USP-6EL SOT-25 1 2 3 4 5 6 PIN NAME FUNCTIONS LX GND VOUT CE NC VIN Switching Ground Output Voltage Chip Enable No Connection Power Input 5 2 4 3 1 ■ CE PIN FUNCTION PIN NAME CE SIGNAL STATUS H Operation (All Series) L Standby (All Series) * Please do not leave the CE pin open. ■ABSOLUTE MAXIMUM RATINGS PARAMETER Ta=25˚C SYMBOL RATINGS UNITS VIN Pin Voltage LX Pin Voltage VIN VLX -0.3 ~ +7.0 -0.3 ~ VIN+0.3 or +7.0 (*1) V V VOUT Pin Voltage CE Pin Voltage VOUT VCE -0.3 ~ VIN+0.3 or +7.0 (*1) -0.3 ~ +7.0 V V LX Pin Current ILX 1000 mA SOT-25 Power Dissipation USP-6EL (DAF) Operating Ambient Temperature Storage Temperature Pd Topr Tstg 250 600 (40mm x 40mm Standard board) (*2) 120 750 (40mm x 40mm Standard board) (*2) -40 ~ +85 -55 ~ +125 * All voltages are described based on the GND. (*1) The maximum value is the lower of either VIN + 0.3 or +7.0. The power dissipation figure shown is PCB mounted and is for reference only. The mounting condition is please refer to PACKAGING INFORMATION. (*2) 4/24 mW ˚C ˚C XC9140 (Design Target) XC9272 Series ■ELECTRICAL CHARACTERISTICS ●XC9272A Type, without CL discharge function PARAMETER SYMBOL Input Voltage VIN Ta=25˚C CONDITIONS - MIN. TYP. MAX. UNITS CIRCUIT 2.0 - 6.0 V ① V ② Resistor connected with LX pin. Output Voltage VOUT(E) (*2) Voltage which LX pin changes “L” to “H” level E1 while VOUT is decreasing. VCE=VIN, VOUT=0V. Resistor connected with LX pin. UVLO Release Voltage VUVLO(E) 1.65 1.8 1.95 V ② 0.1 0.15 0.23 V ② VIN=VCE=2.0V, VOUT=VOUT(T)+0.5V (*1), LX=Open. - 0.5 0.8 μA ③ Voltage which LX pin changes “L” to “H” level while VIN is increasing. UVLO Hysteresis Voltage Supply Current VCE=VIN, VOUT=0V. Resistor connected with LX pin. VHYS(E) VUVLO(E) - Voltage which LX pin changes “H” to “L” level while VIN is decreasing. Iq Standby Current ISTB VIN=5.0V, VCE=VOUT=0V, LX=Open. - 0.1 1.0 μA ③ LX SW “H” Leak Current ILEAKH VIN=5.0V, VCE=VOUT=0V, VLX=0V. - 0.1 1.0 μA ③ LX SW “L” Leak Current ILEAKL VIN=5.0V, VCE=VOUT=0V, VLX=5.0V. - 0.1 1.0 μA ③ 115 180 250 mA ① - 85 - % ① PFM Switching Current Efficiency (*3) LX SW “Pch” ON Resistance (*4) LX SW “Nch” ON Resistance Output Voltage Temperature Characteristics IPFM EFFI VIN=VCE=VOUT(T)+2.0V (*1) , IOUT=10mA. VIN=VCE=3.6V, VOUT(T)=0.7V (*1), IOUT=30mA. RLXP VIN=VCE=5.0V, VOUT=0V, ILX=50mA. - 0.4 0.65 Ω ④ RLXN VIN=VCE=5.0V. - 0.4 (*5) - Ω - -40℃≦Topr≦85℃. - ±100 - ppm/℃ ② 1.2 - 6.0 V ⑤ GND - 0.3 V ⑤ ΔVOUT/ (VOUT・ΔTopr) VOUT=0V. Resistor connected with LX pin. CE “High” Voltage VCEH Voltage which LX pin changes “L” to “H” level while VCE=0.2→1.5V. VOUT=0V. Resistor connected with LX pin. CE “Low” Voltage VCEL Voltage which LX pin changes “H” to “L” level while VCE=1.5→0.2V. CE “High” Current ICEH VIN=VCE=5.0V, VOUT=0V, LX=Open. -0.1 - 0.1 μA ⑤ CE “Low” Current ICEL VIN=5.0V, VCE=VOUT=0V, LX=Open. -0.1 - 0.1 μA ⑤ 0.14 0.3 0.48 V ② Short Protection Threshold Voltage Resistor connected with LX pin. VSHORT Voltage which LX pin changes “H” to “L” level while VOUT= VOUT(T)+0.1V→0V(*1). Unless otherwise stated, VIN=VCE=5.0V (*1) VOUT(T)=Nominal Output Voltage (*2) VOUT(E)=Effective Output Voltage The actual output voltage value VOUT(E) is the PFM comparator threshold voltage in the IC. Therefore, the DC/DC circuit output voltage, including the peripheral components, is boosted by the ripple voltage average value. Please refer to the characteristic example. (*3) EFFI=[{ (Output Voltage)×(Output Current)] / [(Input Voltage)×(Input Current)}]×100 (*4) LX SW “Pch” ON resistance = (VIN – VLX pin measurement voltage) / 50mA (*5) ) Designed value 5/24 XC9272 Series ■ELECTRICAL CHARACTERISTICS (Continued) ●XC9272B Type, with CL discharge function PARAMETER SYMBOL Input Voltage VIN CONDITIONS - MIN. TYP. MAX. UNITS CIRCUIT 2.0 - 6.0 V ① V ② Resistor connected with LX pin. Output Voltage VOUT(E) (*2) Voltage which LX pin changes “L” to “H” level E1 while VOUT is decreasing. VCE=VIN, VOUT=0V. Resistor connected with LX pin. UVLO Release Voltage VUVLO(E) 1.65 1.8 1.95 V ② 0.1 0.15 0.23 V ② VIN=VCE=2.0V, VOUT=VOUT(T)+0.5V (*1), LX=Open. - 0.5 0.8 μA ③ Voltage which LX pin changes “L” to “H” level while VIN is increasing. UVLO Hysteresis Voltage Supply Current VCE=VIN, VOUT=0V. Resistor connected with LX pin. VHYS(E) VUVLO(E) - Voltage which LX pin changes “H” to “L” level while VIN is decreasing. Iq Standby Current ISTB VIN=5.0V, VCE=VOUT=0V, LX=Open. - 0.1 1.0 μA ③ LX SW “H” Leak Current ILEAKH VIN=5.0V, VCE=VOUT=0V, VLX=0V. - 0.1 1.0 μA ③ LX SW “L” Leak Current ILEAKL VIN=5.0V, VCE=VOUT=0V, VLX=5.0V. - 0.1 1.0 μA ③ 115 180 250 mA ① - 85 - % ① PFM Switching Current Efficiency (*3) LX SW “Pch” ON Resistance (*4) LX SW “Nch” ON Resistance Output Voltage Temperature Characteristics IPFM EFFI VIN=VCE=VOUT(T)+2.0V (*1) , IOUT=10mA. VIN=VCE=3.6V, VOUT(T)=0.7V (*1), IOUT=30mA. RLXP VIN=VCE=5.0V, VOUT=0V, ILX=50mA. - 0.4 0.65 Ω ④ RLXN VIN=VCE=5.0V. - 0.4 (*5) - Ω - -40℃≦Topr≦85℃. - ±100 - ppm/℃ ② 1.2 - 6.0 V ⑤ GND - 0.3 V ⑤ ΔVOUT/ (VOUT・ΔTopr) VOUT=0V. Resistor connected with LX pin. CE “High” Voltage VCEH Voltage which LX pin changes “L” to “H” level while VCE=0.2→1.5V. VOUT=0V. Resistor connected with LX pin. CE “Low” Voltage VCEL Voltage which LX pin changes “H” to “L” level while VCE=1.5→0.2V. CE “High” Current ICEH VIN=VCE=5.0V, VOUT=0V, LX=Open. -0.1 - 0.1 μA ⑤ CE “Low” Current ICEL VIN=5.0V, VCE=VOUT=0V, LX=Open. -0.1 - 0.1 μA ⑤ 0.14 0.3 0.48 V ② 55 80 105 Ω ③ Short Protection Threshold Voltage CL Discharge Resistor connected with LX pin. VSHORT Voltage which LX pin changes “H” to “L” level while VOUT= VOUT(T)+0.1V→0V(*1). RDCHG VIN=VOUT=5.0V, VCE=0V, LX=Open. Unless otherwise stated, VIN=VCE=5.0V (*1) VOUT(T)=Nominal Output Voltage (*2) VOUT(E)=Effective Output Voltage The actual output voltage value VOUT(E) is the PFM comparator threshold voltage in the IC. Therefore, the DC/DC circuit output voltage, including the peripheral components, is boosted by the ripple voltage average value. Please refer to the characteristic example. (*3) EFFI=[{ (Output Voltage)×(Output Current)] / [(Input Voltage)×(Input Current)}]×100 (*4) LX SW “Pch” ON resistance = (VIN – VLX pin measurement voltage) / 50mA (*5) Designed value 6/24 XC9140 (Design Target) XC9272 Series ■ELECTRICAL CHARACTERISTICS (Continued) XC9272 series voltage specification chart SYMBOL E1 PARAMETER Output Voltage UNITS: V UNITS: V OUTPUT VOLTAGE MIN. MAX. 0.60 0.58 0.62 0.65 0.63 0.67 0.70 0.68 0.72 0.75 0.73 0.77 0.80 0.78 0.82 0.85 0.83 0.87 0.90 0.88 0.92 0.95 0.93 0.97 7/24 XC9272 Series ■TEST CIRCUITS < Test Circuit No.2 > < Test Circuit No.1 > Wave Form Measure Point Wave Form Measure Point IOUT L A CIN VIN LX CE VOUT CIN VIN LX CE VOUT Rpulldown CL GND V ※　External Components ※　External Components 　　 L : 10uH 　　 CIN : 10uF (ceramic) 　　 CL : 22uF (ceramic) 　　CIN : 10uF 　　Rpulldown : 100Ω < Test Circuit No.3 > A < Test Circuit No.4 > VIN LX CIN CIN CE VOUT A A ※　External Components 　　CIN : 10uF 　　CIN : 10uF < Test Circuit No.5 > Wave Form Measure Point VIN LX ICEH A ICEL ※　External Components 　　CIN : 10uF 　　Rpulldown : 100Ω 8/24 CE VOUT GND VIN CE GND ※　External Components CIN GND V Rpulldown LX VOUT GND V IS XC9140 (Design Target) XC9272 Series ■TYPICAL APPLICATION CIRCUIT 【Typical Examples】 MANUFACTURE PRODUCT NUMBER VALUE TDK VLF302512M-100M 10μH Coilcraft LPS3015-103MRB 10μH Murata DFE201610E-100M 10μH CIN TAIYO YUDEN LMK107BJ106MA 10μF/10V CL TAIYO YUDEN JMK107BJ226MA 22μF/6.3V L * Take capacitance loss, withstand voltage, and other conditions into consideration when selecting components. * Characteristics are dependent on deviations in the coil inductance value. Test fully using the actual device. * A value of 10μH is recommended for the coil inductance. * If a tantalum or electrolytic capacitor is used for the load capacitance CL, ripple voltage will increase, and there is a possibility that operation will become unstable. Test fully using the actual device. 9/24 XC9272 Series ■OPERATIONAL EXPLANATION The XC9272 series consists of a reference voltage supply, PFM comparator, Pch driver Tr, Nch synchronous rectification switch Tr, current sensing circuit, PFM control circuit, CE control circuit, and others. (Refer to the block diagram below.) PFM Comparator Unit PFM Comparator Unit VOUT VOUT CFB CFB RFB1 Short protection RFB2 CL Discharge PFM Comparator RFB2 CE CE Controller Logic PFM Comparator + PFM Controller VREF Synch Buffer Driver PFM Controller LX CE CE Controller Logic VREF Synch Buffer Driver LX VDD VDD VIN Current Sense FB - FB + RFB1 Short protection Current Sense GND UVLO VIN start up Controller VIN XC9272A Type GND UVLO VIN start up Controller XC9272B Type An ultra-low quiescent current circuit and synchronous rectification enable a significant reduction of dissipation in the IC, and the IC operates with high efficiency at both light loads and heavy loads. Current limit PFM is used for the control method, and even when switching current superposition occurs, increases of output voltage ripple are suppressed, allowing use over a wide voltage and current range. The IC is compatible with low-capacitance ceramic capacitors, and a small, high-performance step-down DCDC converter can be created. The actual output voltage VOUT(E) in the electrical characteristics is the threshold voltage of the PFM comparator in the block diagram. Therefore the average output voltage of the step-down circuit, including peripheral components, depends on the ripple voltage. Before use, test fully using the actual device Reference voltage for stabilization of the output voltage of the IC. (1) The feedback voltage (FB voltage) is the voltage that results from dividing the output voltage with the IC internal dividing resistors RFB1 and RFB2. The PFM comparator compares this FB voltage to VREF. When the FB voltage is lower than VREF, the PFM comparator sends a signal to the buffer driver through the PFM control circuit to turn on the Pch driver Tr. When the FB voltage is higher than VREF, the PFM comparator sends a signal to prevent the Pch driver Tr from turning on. (2) When the Pch driver Tr is on, the current sense circuit monitors the current that flows through the Pch driver Tr connected to the Lx pin. When the current reaches the set PFM switching current (IPFM), the current sense circuit sends a signal to the buffer driver through the PFM control circuit. This signal turns off the Pch driver Tr and turns on the Nch synchronous rectification switch Tr. (3) The on time of the Nch synchronous rectification switch Tr is dynamically optimized inside the IC. After the off time elapses and the PFM comparator detects that the VOUT voltage is higher than the set voltage, the PFM comparator sends a signal to the PFM control circuit that prevents the Pch driver Tr from turning on. However, if the VOUT voltage is lower than the set voltage, the PFM comparator starts Pch driver Tr on. By continuously adjusting the interval of the linked operation of (1), (2) and (3) above in response to the load current, the output voltage is stabilized with high efficiency from light loads to heavy loads. 10/24 XC9140 (Design Target) XC9272 Series ■OPERATIONAL EXPLANATION (Continued) The PFM switching current monitors the current that flows through the Pch driver Tr, and is a value that limits the Pch driver Tr current. The Pch driver Tr remains on until the coil current reaches the PFM switching current (IPFM). An approximate value for this on-time tON can be calculated using the following equation: tON = L × IPFM / (VIN – VOUT) To avoid excessive ripple voltage in the event that the coil current does not reach the PFM switching current within a certain interval even though the Pch driver Tr has turned on and the FB voltage is above VREF, the Pch driver Tr can be turned off at any timing using the maximum on-time function of the PFM control circuit. If the Pch driver Tr turns off by the maximum on-time function instead of the current sense circuit, the Nch synchronous rectification switch Tr will not turn on and the coil current will flow to the VOUT pin by means of the parasite diode of the Nch synchronous rectification switch Tr. When the VIN voltage rises, VIN start mode stops the short-circuit protection function during the interval until the FB voltage approaches VREF. After the VIN voltage rises and the FB voltage approaches VREF by step-down operation, VIN start mode is released. In order to prevent an excessive rush current while VIN start mode is activated, Nch synchronous rectification switch Tr will not turn on and the coil current flows to the VOUT pin by means of the parasitic diode of the Nch synchronous rectification Tr. In VIN start mode as well, the coil current is limited by the PFM switching current. The short-circuit protection function monitors the VOUT voltage. In the event that the VOUT pin is accidentally shorted to GND or an excessive load current causes the VOUT voltage to drop below the set short-circuit protection voltage, the short-circuit protection function activates, and turns off and latches the Pch driver Tr at any selected timing. Once in the latched state, the IC is turned off and then restarted from the CE pin, or operation is started by re-applying the VIN voltage. When the VIN pin voltage drops below the UVLO detection voltage, the IC stops switching operation at any selected timing, turns off the Pch driver Tr and Nch synchronous rectification switch Tr (UVLO mode). When the VIN pin voltage recovers and rises above the UVLO release voltage, the IC restarts operation. On the XC9272 series, a CL discharge function is available as an option (XC9272B type). This function enables quick discharging of the CL load capacitance when “L” voltage is input into the CE pin by the Nch Tr connected between the VOUT-GND pins, or in UVLO mode. This prevents malfunctioning of the application in the event that a charge remains on CL when the IC is stopped. The discharge time is determined by CL and the CL discharge resistance RDCHG, including the Nch Tr (refer to the diagram below). Using this time constant τ= CL×RDCHG, the discharge time of the output voltage is calculated by means of the equation below. V = VOUT × e - t /τ, or in terms of t, t = τIn(VOUT / V) V: Output voltage after discharge VOUT : Set output voltage ｔ: Discharge time CL: Value of load capacitance (CL) RDCHG : Value of CL discharge resistance Varies by power supply voltage. τ: CL × RDCHG The CL discharge function is not available on the XC9272A type. CE / UVLO Signal VOUT R RDCHG = R + RON RON 11/24 XC9272 Series ■NOTE ON USE 1. Be careful not to exceed the absolute maximum ratings for externally connected components and this IC. 2. The DC/DC converter characteristics greatly depend not only on the characteristics of this IC but also on those of externally connected components, so refer to the specifications of each component and be careful when selecting the components. Be especially careful of the characteristics of the capacitor used for the load capacity CL and use a capacitor with B characteristics (JIS Standard) or an X7R/X5R (EIA Standard) ceramic capacitor. 3. Use a ground wire of sufficient strength. Ground potential fluctuation caused by the ground current during switching could cause the IC operation to become unstable, so reinforce the area around the GND pin of the IC in particular. 4. Mount the externally connected components in the vicinity of the IC. Also use short, thick wires to reduce the wire impedance. 5. When the voltage difference between VIN and VOUT is small, switching energy increases and there is a possibility that the ripple voltage will be too large. Before use, test fully using the actual device. 6. The CE pin does not have an internal pull-up or pull-down, etc. Apply the prescribed voltage to the CE pin. 7. If other than the inductance and capacitance values listed in the “Typical example” are used, excessive ripple voltage or a drop in efficiency may result. 8. If other than the inductance and capacitance values listed in the “Typical example” are used, a drop of output voltage at load transient may cause the short-circuit protection function to activate. Before use, test fully using the actual device. 9. At high temperature, excessive ripple voltage may occur and cause a drop in output voltage and efficiency. Before using at high temperature, test fully using the actual device 10. At light loads or when IC operation is stopped, leakage current from the Pch driver Tr may cause the output voltage to rise. 11. The average output voltage may vary due to the effects of output voltage ripple caused by the load current. Before use, test fully using the actual device. 12. If VIN voltage is high or the CL capacitance or load current is large, the output voltage rise time will lengthen when the IC is started, and coil current overlay may occur during the interval until the output voltage reaches the set voltage (refer to the diagram below). 13. When the IC is started, the short-circuit protection function does not operate during the interval until the VOUT voltage reaches a value near the set voltage. 14. If the load current is excessively large when the IC is started, it is possible that the VOUT voltage will not rise to the set voltage. Before use, test fully using the actual device. 12/24 XC9140 (Design Target) XC9272 Series ■NOTE ON USE (Continued) 15. In actual operation, the maximum on-time depends on the peripheral components, input voltage, and load current. Before use, test fully using the actual device. 16. When the VIN voltage is turned on and off continuously, excessive rush current may occur while the voltage is on. Before use, test fully using the actual device. 17. When the VIN voltage is high, the Pch driver may change from on to off before the coil current reaches the PFM switching current (IPFM), or before the maximum on-time elapses. Before use, test fully using the actual device. 18. For temporary, transitional voltage drop or voltage rising phenomenon, the IC is liable to malfunction should the ratings be exceeded. 19. Torex places an importance on improving our products and their reliability. We request that users incorporate fail-safe designs and post-aging protection treatment when using Torex products in their systems. 13/24 XC9272 Series ■NOTE ON USE (Continued) ●Instructions of pattern layouts 1. To suppress fluctuations in the VIN potential, connect a bypass capacitor (CIN) in the shortest path between the VIN pin and ground pin. 2. Please mount each external component as close to the IC as possible. 3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit impedance. 4. Make sure that the ground traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of switching may result in instability of the IC. 5. Internal driver transistors bring on heat because of the transistor current and ON resistance of the driver transistors. ●Reference Pattern Layout (USP-6EL) Top view ●Reference Pattern Layout (SOT-25) 14/24 Bottom view XC9140 (Design Target) XC9272 Series Top view Bottom view 15/24 XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (1) Efficiency vs. Output Current (2) Output Voltage vs. Output Current 16/24 XC9140 (Design Target) XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (2) Output Voltage vs. Output Current (3) Ripple Voltage vs. Output Current 17/24 XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (4) Output Voltage vs. Ambient Temperature (5) Supply Current vs. Ambient Temperature (6) Standby Current vs. Ambient Temperature 18/24 XC9140 (Design Target) XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (7) UVLO Release Voltage vs. Ambient Temperature (8) PFM Switching Current vs. Ambient Temperature (9) Maximum Frequency vs. Ambient Temperature 19/24 XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (10) Pch Driver ON Resistance vs. Ambient Temperature (12) Lx SW "H" Leakage Current vs. Ambient Temperature (14) CE "High" Voltage vs. Ambient Temperature 20/24 (11) Nch Driver ON Resistance vs. Ambient Temperature (13) Lx SW "L" Leakage Current vs. Ambient Temperature (15) CE "Low" Voltage vs. Ambient Temperature XC9140 (Design Target) XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (16) CL Discharge vs. Ambient Temperature (17) Short Protection Threshold vs. Ambient Temperature (18) Rising Output Voltage 21/24 XC9272 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (19) Load Transient Response 22/24 XC9140 (Design Target) XC9272 Series ■PACKAGING INFORMATION For the latest package information go to, www.torexsemi.com/technical-support/packages PACKAGE OUTLINE / LAND PATTERN THERMAL CHARACTERISTICS SOT-25 SOT-25 PKG Standard Board SOT-25 Power Dissipation USP-6EL(DAF) USP-6EL PKG Standard Board USP-6EL Power Dissipation 23/24 XC9272 Series ■MARKING RULE ●SOT-25(Under dot仕様) dot) SOT-25(Under 5 4 ① ② ③ 1 2 ④ ⑤ 3 Magnified 拡大 ●USP-6EL USP-6EL ① 1 ④ ② ⑤ ③ 2 3 6 5 4 ① represents product series MARK PRODUCT SERIES C XC9272A/B*****-G ※SOT-25 Under dot ② represents output voltage MARK OUTPUT VOLTAGE PRODUCT SERIES N 0.6 0.65 XC9272*06***-G P 0.7 0.75 XC9272*07***-G R 0.8 0.85 XC9272*08***-G S 0.9 0.95 XC9272*09***-G ③ represents product type and output voltage type MARK PRODUCT TYPE OUTPUT VOLTAGE TYPE PRODUCT SERIES N Without CL Discharge Output Voltage {x.x0V} (the 2nd decimal place is “0”) XC9272A**1**-G P Without CL Discharge Output Voltage {x.x5V} (the 2nd decimal place is “5”) XC9272A**B**-G R With CL Discharge Output Voltage {x.x0V} (the 2nd decimal place is “0”) XC9272B**1**-G S With CL Discharge Output Voltage {x.x5V} (the 2nd decimal place is “5”) XC9272B**B**-G ④⑤ represents production lot number 01～09、0A～0Z、11～9Z、A1～A9、AA～AZ、B1～ZZ (G, I, J, O, Q, W excluded) * No character inversion used. 24/24 XC9140 (Design Target) XC9272 Series 1. The product 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 datasheet is up to date. 2. The information in this datasheet is intended to illustrate the operation and characteristics of our products. We neither make warranties or representations with respect to the accuracy or completeness of the information contained in this datasheet nor grant any license to any intellectual property rights of ours or any third party concerning with the information in this datasheet. 3. Applicable export control laws and regulations should be complied and the procedures required by such laws and regulations should also be followed, when the product or any information contained in this datasheet is exported. 4. The product is neither intended nor warranted for use in equipment of systems which require extremely high levels of quality and/or reliability and/or a malfunction or failure which may cause loss of human life, bodily injury, serious property damage including but not limited to devices or equipment used in 1) nuclear facilities, 2) aerospace industry, 3) medical facilities, 4) automobile industry and other transportation industry and 5) safety devices and safety equipment to control combustions and explosions. Do not use the product for the above use unless agreed by us in writing in advance. 5. Although we make continuous efforts to improve the quality and reliability of our products; nevertheless Semiconductors are likely to fail with a certain probability. So in order to prevent personal injury and/or property damage resulting from such failure, customers are required to incorporate adequate safety measures in their designs, such as system fail safes, redundancy and fire prevention features. 6. Our products are not designed to be Radiation-resistant. 7. Please use the product listed in this datasheet within the specified ranges. 8. We assume no responsibility for damage or loss due to abnormal use. 9. All rights reserved. No part of this datasheet may be copied or reproduced unless agreed by Torex Semiconductor Ltd in writing in advance. TOREX SEMICONDUCTOR LTD. 25/24