XC9140 Schematic - TOREX

XC9140 Schematic ( PDF Datasheet ) - TOREX

Teilenummer	XC9140
Beschreibung	Step-UpSynchronous PFM DC/DC Converter
Hersteller	TOREX
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Gesamt 28 Seiten XC9140 Series Step-Up Synchronous PFM DC/DC Converter ETR04015-003 ■ GENERAL DESCRIPTION ☆GreenOperation Compatible The XC9140 series are step-up synchronous DC/DC converters that support ceramic capacitors and have an internal 0.6Ω (TYP.) Nch driver transistor and an internal 0.65Ω (TYP.) Pch synchronous rectifier switch transistor. PFM control enables a low quiescent current, making these products ideal for portable devices that require high efficiency. When the output voltage is 3.3V and the load current is 1mA (XC9140Axx1 type and XC9140Cxx1 type), startup from an input voltage of VIN = 0.9V is possible which means that these products can be used in applications that start using a single alkaline or nickel-metal hydride battery. The output voltage can be set from 1.8V to 5.0V (±2.0%) in steps of 0.1V. The XC9140 features a load disconnect function to break continuity between the input and output at shutdown (XC9140A), and also a bypass mode function to maintain continuity between the input and output (XC9140C). A version with a UVLO (Under Voltage Lock-out) function is also available. This function enables the prevention of battery leakage by stopping IC’s operation when the input voltage is low. The standard product has a UVLO release voltage of 2.15V (±3.0%), and a custom version with a release voltage selectable from between 1.65V to 2.2V, in steps of 0.05V, is also available. ■APPLICATIONS ● Mouses, Keyboards ● Bluetooths ● Household use Medical equipments ● Remote controls ● Game consoles ● Devices with 1~3 Alkaline, 1~3 Nickel Hydride, 1 Lithium and 1 Li-ion ■FEATURES Input Voltage Range Output Voltage Setting Output Current Driver Transistor Supply Current Control Method High speed transient response PFM Switching Current Functions Operating Ambient Temperature Packages Environmentally Friendly : 0.9V~5.5V : 1.8V~5.0V (±2.0%) 0.1V increments : 100mA＠VOUT=3.3V, VBAT=1.8V (TYP.) : 0.6Ω Nch driver transistor 0.65Ω Pch synchronous rectifier switch transistor : 6.3μA (VBAT=VOUT+0.5V) : PFM Control : 50mV@VOUT=3.3V, VBAT=1.8V, IOUT=1→50mA : 350mA : Load Disconnection Function or Bypass Mode Function UVLO Function Ceramic Capacitor : -40℃～+85℃ : SOT-25, USP-6EL : EU RoHS Compliant, Pb Free ■TYPICAL APPLICATION CIRCUIT L=4.7μH LX CE VIN=0.9～5.5V CCIN=IN1=04.μ7μFF VBAT VOUT GND CL=10μF ■TYPICAL PERFORMANCE CHARACTERISTICS ●Efficiency vs. Output Current XC9140A331MR-G(VOUT=3.3V) L=4.7μH(VLF302512M-4R7M),CIN=4.7μF(LMK107BJ475MA), 100 CL=10μF(LMK107BJ106MA) 2.5V 80 60 3.0V VBAT=1.8V 40 20 0 0.01 0.1 1 10 100 Output Current : IOUT (mA) 1000 1/28 XC9140 Series ■ ELECTRICAL CHARACTERISTICS (Continued) ●XC9140Axxx types (types other than XC9140Axx1), with UVLO function, without CL discharge function PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. Ta=25˚C UNITS CIRCUIT Input Voltage Output Voltage Operation Start Voltage VBAT V (2) OUT(E) VST1 - VPULL=1.5V, Voltage to start oscillation while VOUT is decreasing IOUT=1mA - - - 5.5 V E1 V - VRELEASE(E) (7) V ① ② Operation Hold Voltage VHLD RL=1kΩ VDETECT(E) (8) - - V② Supply Current2 Input Pin Current2 Stand-by Current LX Leak Current PFM Switching Current Maximum ON Time Efficiency (3) Efficiency (3) Efficiency (3) LX SW “Pch” ON Resistance (4) LX SW “Nch” ON Resistance (5) CE “High” Voltage Iq IBAT ISTB ILXL IPFM tONMAX EFFI EFFI EFFI RLXP RLXN VCEH Oscillation stops, VOUT=VOUT(T)+0.5V (1) VOUT=VOUT(T)+0.5V (1) VBAT=VLX=VOUT(T) (1), VOUT=VCE=0V VBAT=VLX=VOUT(T) (1), VOUT=VCE=0V IOUT=3mA VPULL= VRELEASE(T)+0.1V (6), VOUT=VOUT(Ｔ)×0.98V (1) VOUT(T) (1)=2.5V, IOUT=30mA VOUT(T) (1)=3.3V, IOUT=30mA VOUT(T) (1)=5.0V, IOUT=30mA VBAT=VLX=VCE=VOUT(T)+0.5V (1), IOUT=200mA VBAT=VCE=3.3V, VOUT=1.7V VBAT=VPULL= VRELEASE(T)+0.1V (6), VOUT=VOUT(Ｔ)×0.98V (1) While VCE=0.3→0.75V, Voltage to start oscillation E4 μA ③ E5 μA ③ - 0.1 1.0 μA ④ - 0.1 1.0 μA ⑤ 295 350 405 mA ② 3.1 4.6 6.0 μs ① - 81 - % ② - 85 - % ② - 86 - % ② E3 Ω ⑦ - 0.6 - Ω ⑧ 0.75 - 5.5 V ① CE “Low” Voltage VCEL VBAT=VPULL= VRELEASE(T)+0.1V (6), VOUT=VOUT(Ｔ)×0.98V (1) While VCE=0.75→0.3V, Voltage to stop oscillation GND - 0.3 V ① CE “High” Current ICEH VBAT=VCE=VLX=VOUT=5.5V -0.1 - 0.1 μA ① CE “Low” Current UVLO Current UVLO Release Voltage ICEL IDQ VRELEASE(E) (7) VBAT=VLX=VOUT=5.5V, VCE=0V VBAT= VCE= VDETECT(E) - 0.1V (8), IOUT=0mA VPULL= VOUT= VOUT(Ｔ)×0.98V (1), VBAT= VCE Voltage to start oscillation while -0.1 - E6 E7 0.1 μA μA ① ② V① VBAT is increasing VPULL= VOUT= VOUT(Ｔ)×0.98V (1), UVLO Hysteresis Voltage V (9) HYS(E) VBAT= VCE VRELEASE(E) - Voltage to stop oscillation 0.1 0.15 0.2 V ① while VBAT is decreasing(7) Unless otherwise stated,, VBAT=VCE=VRELEASE(T)+0.1V (6) (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=(VLX-VOUT pin measurement voltage) / 200mA (5) The LX SW “Nch” ON resistance measurement method is shown in the measurement circuit diagram. (6) VRELEASE(T)= Nominal UVLO release voltage (7) VRELEASE(E)= Actual UVLO release voltage (8) VDETECT(E)=VRELEASE(E) -VHYS(E)= Actual UVLO detect voltage (9) VHYS(E)= Actual UVLO hysteresis voltage 6/28 6 Page XC9140 Series ■OPERATIONAL EXPLANATION The XC9140 Series consists of a standard voltage source, a PFM comparator, a Nch driver Tr, a Pch synchronous rectifier switch Tr, a current sense circuit, a PFM control circuit and a CE control circuit, etc. (refer to the block diagram below.) LX PFM Comparator Unit CFB RFB1 RFB2 PFM Comparator FB - + VREF Current Sense PFM Controller Buffer Driver and Inrush Currrent Protection CE CE and Bypass Controller Logic Hysteresis UVLO Comparator + - Parasitic Diode Controller VOUT CL Discharge VOUT VOUT GND VDD VBAT–VOUT Detector VBAT Current limit PFM control is used for the control method to make it difficult for the output voltage ripple to increase even when the switching current is superimposed, so the product can be used within a wide voltage and current range. Further, because PFM control is used, it has excellent transient response to support low capacity ceramic capacitors to realize a compact, high-performance boost DC/DC converter. The synchronous driver and rectifier switch Tr efficiently sends the coil energy to the capacitor connected to the VOUT pin to achieve highly efficient operation from low to high loads. The electrical characteristics actual output voltage VOUT(E) is the PFM comparator threshold voltage shown in the block diagram. Therefore, the booster circuit output voltage average value, including the peripheral components, depends on the ripple voltage, so this must be carefully evaluated before being used in the actual product. VBAT=VCE=2.0V、VOUT=3.3V、IOUT=20m A、L=4.7μH、CL=10μF、Ta=25℃ VBAT=VCE=2.0V、VOUT=3.3V、IOUT=70m A、L=4.7μH、CL=10μF、Ta=25℃ VOUT Voltage Average VOUT(E) VLX VOUT ILX IPFM VLX VOUT ILX VOUT Voltage Average VLX:2V/div VOUT:50m V/div VOUT(E) ILX:200m A/div 2[μs /div] 2[μs /div] < Reference Voltage Source (VREF)> The reference voltage source (VREF voltage) provides the reference voltage to ensure stable output voltage of the DC/DC converter. < PFM Control > ①The voltage from the output voltage divided by the division resistors RFB1 and RFB2 in the IC is used as feedback voltage (FB voltage), and the PFM comparator is compared with the FB voltage and VREF. If the FB voltage is lower than VREF, the signal is sent to the buffer driver via the PFM control circuit and the Nch driver Tr is turned ON. If the FB voltage is higher than VREF, the PFM comparator sends a signal that does not turn ON the Nch driver Tr. ②The current sense circuit monitors the current flowing in the Nch driver Tr connected to the Lx pin when the Nch driver Tr is ON. When the prescribed PFM switching current (IPFM) is reached, the signal is sent to the buffer driver via the PFM control circuit to turn OFF the Nch driver Tr and turn ON the Pch synchronous rectifier switch Tr. ③The Pch synchronous rectifier switch Tr ON time (off time) is dynamically optimized internally. After the off time has passed, when the PFM comparator confirms the VOUT voltage has exceeded the set voltage, a signal that does not allow the Nch driver Tr to be turned on is sent from the PFM comparator to the PFM control circuit, but if the VOUT voltage remains lower than the set voltage, then Nch driver Tr ON is started. The intervals of the above ①②③ linked operations are continuously adjusted in response to the load current to ensure the output voltage is kept stable from low to high loads and that it is done with good efficiency. 12/28 12 Page
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