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XC9106/XC9107 Series PWM Control,PWM/PFM Switching Control, Step-Up DC/DC Converters, Externally Applied Vref ETR0405_002 GENERAL DESCRIPTION GO-Compatible The XC9106 / 07 series are step-up DC/DC controller ICs with an externally applied reference voltage (Vref). Output voltage will be set with external resistors (RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications that need to vary voltage, such as LCD power supply for PDA. Output will be stable no matter which load capacitors are used but if a low ESR capacitor is used, RSENSE of about 0.1 will be required and phase compensation will be achieved. This makes the use of ceramic capacitors much easier, and allows for lower output ripple and reduced PCB area requirements. Tantalum and electrolytic capacitors can also be used, in which case, RSENSE becomes unnecessary. Oscillation frequencies of high clock, low ripple 300kHz and low supply current 100kHz are available. The XC9107 series are PWM/PFM automatic switching controlled. Control switches from PWM to PFM during light loads with the XC9107 and the series is highly efficient from light loads to large output currents. By bringing the whole circuit down while the series is in the stand-by mode (CE/PWM pin: low), supply current can be reduced to less than 1.0A. APPLICATIONS Power supply for LCDs PDAs Cellular phones Palmtop computers Portable audio systems Various multi-function power supplies FEATURES Input Voltage : 0.9V ~ 10V Power Supply Voltage Range : 1.8V~10.0V and more than Vref+0.7V VREF Input Range : 0.8V~2.5V (2.0%) Output Voltage : Vref x external split resistor ratio VOUT=Vref x (RFB1+RFB2)/RFB2 Oscillation Frequency : 300kHz, 100kHz (15%) Output Current : More than 30mA (VIN=3.3V, VOUT=20V, when external components are used as in the circuits below.) Controls : PWM (XC9106) : PWM/PFM auto-switching (XC9107) High Efficiency : 85% (TYP.) Stand-by Current : ISTB = 1.0A (MAX.) Load Capacitors : Low ESR capacitors compatible Externally Applied Reference Voltage (Vref) Packages : SOT-25, USP-6B TYPICAL APPLICATION CIRCUIT RSENSE : 100m for Ceramic CL SD : MA737 * CFB : 27pF VOUT = 8V~25V IOUT = 30mA RFB1 : 270k RFB2 : 30k CIN Ceramic CL : 10F 1 2 3 CE/Vref 0.8V~2.5V D/A converter 4 5 Nch Pow er MOS FET 2SK2159 VIN = 3.3V TYPICAL PERFORMANCE CHARACTERISTICS XC9107D003MR 30 25 VOUT (V) 20 15 10 5 0 0.0 0.5 1.0 1.5 2.0 Vref (V) 2.5 3.0 Circuit as lef t VDD=VIN=3.3V, IOUT=30mA L : 10H XC9107D003MR 30 25 VOUT (V) 20 15 10 5 0 0.1 1 Circuit as left VDD=VIN=3.3V 2.5V 2.0V 1.5V Vref=0.8V * RSENSE is of no use in light load (uncontinuous mode) applications such as a small LCD, even using ceramic capacitor. 10 IOUT (mA) 100 1000 1/11 XC9106/XC9107 Series PIN CONFIGURATION NC GND 5 4 FB 6 NC 5 CE/VIEW 1 EXT 2 VDD 3 *The dissipation pad for the USP-6B 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 VDD pin. 1 FB 2 VDD 3 CE/Vref SOT-25 (TOP VIEW) PIN ASSIGNMENT PIN NUMBER SOT-25 1 2 3 4 5 6 2 4 3 1 5 PIN USP-6B NAME FB VDD CE/ Vref GND EXT NC FUNCTION Output Resistor Connection Supply Voltage Serves as Both Chip Enable Pin and Reference Voltage Apply Pin. Ground External Transistor Connection No Connection PRODUCT CLASSIFICATION Ordering Information XC9106D : PWM control XC9107D : PWM/PFM automatic switching control DESIGNATOR DESCRIPTION Reference Voltage (Apply External) Oscillation Frequency Packaging Types Device Orientation SYMBOL 00 3 1 M D R L : Fixed : 300kHz : 100kHz : SOT-25 : USP-6B : Embossed tape, standard feed : Embossed tape, reverse feed DESCRIPTION * Output voltage 0.9V ~ 4.0V (100mV steps), 1.85V and 2.85V are standard products. Output voltages other than these are available as semi-custom products. 2/11 XC9106/XC9107 Series BLOCK DIAGRAM FB Current Ripple Detect and FB Phase Compensation VDD PWM Comparator Error Amp. Vref with Soft Start, CE CE / Vref PWM/PFM Controller Ramp Wave Generator, OSC Buffer, Driver EXT GND FB, CE : CMOS INPUT EXT : CMOS OUTPUT ABSOLUTE MAXIMUM RATINGS PARAMETER VDD pin Voltage FB Pin Voltage CE / Vref pin Voltage EXT pin Voltage EXT pin Current SOT-25 Power Dissipation USP-6B Operating Temperature Range Storage Temperature Range SYMBOL VDD VFB VCE / Vref VEXT IEXT/ Pd Topr Tstg RATINGS -0.312.0 -0.312.0 -0.312.0 -0.3VDD+0.3 100 150 100 -40+85 -55+125 Ta = 25 C UNITS V V V V mA mW O O O C C 3/11 XC9106/XC9107 Series ELECTRICAL CHARACTERISTICS XC9106D001MR, XC9107D001MR PARAMETER Output Voltage Reference Voltage Range FB Control Voltage Supply Voltage Range (*1) Operation Start Voltage Oscillation Start Voltage (*1) Operation Hold Voltage Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency Maximum Duty Ratio PFM Duty Ratio Efficiency Soft-start Time CE "High" Voltage CE "Low" Voltage EXT "High" ON Resistance EXT "Low" ON Resistance CE "High" Current CE "Low" Current FB "High" Current FB "Low" Current SYMBOL VOUT Vref VFB Vref = 0.8V Vref = 0.9V Vref = 2.5V VDD as shown right and (Vref applied voltage+0.7V) Recommended Circuit using 2SD1628, IOUT=1.0mA No external connections, CE/Vref=0.9V, Voltage applied, FB=0V Recommended circuit using 2SD1628, IOUT=1.0mA Same as VST2, VDD=3.300V Same as IDD1, FB=1.2V Same as IDD1, CE/Vref=0V Same as IDD1 Same as IDD1 No Load (XC9106 series) Recommended circuit using XP161A1355 Vref=0.9V Same as IDD1 Same as IDD1 Same as IDD1, VEXT=VOUT-0.4V Same as IDD1, VEXT=0.4V Same as IDD2, CE=0.8V Same as IDD2, CE=2.5V Same as IDD2, CE=0V Same as IDD2, FB=VDD Same as IDD2, FB=1.0V (FOSC=100kHz) MIN. 8.820 0.8 0.784 0.882 2.450 1.8 85 75 20 5.0 0.65 -1.0 0.0 TYP. 9.000 0.800 0.900 2.500 29 14 100 81 28 85 10.0 24 16 MAX. 9.180 2.5 0.816 0.918 2.550 10.0 0.9 0.8 0.7 41 19 1.0 115 87 36 20.0 0.20 36 24 0.0 2.5 -0.1 0.1 -0.1 V V V Ta=25 C UNITS CIRCUIT O CONDITIONS Vref = 0.9V VDD VST1 VST2 VHLD IDD1 IDD2 ISTB FOSC MAXDTY PFMDTY EFFI TSS VCEH VCEL REXTH REXTL ICEH ICEL IFBH IFBL V V V V A A A kHz % % % mS V V A A A A Test Conditions: Unless otherwise stated, CL: Ceramic, recommended MOSFET should be connected. Vref= 0.09V, RFB1,2x10 VDD= 3.3V VIN= 3.3V IOUT= 50mA NOTE: *1: Although the IC starts step-up operations from a VDD of 0.8V, the output voltage and oscillation frequency are stabilized at VDD 1.8V and (Vref applied voltage0.7V). Therefore, a VDD of more than 1.8V and (Vref applied voltage0.7V) is recommended when VDD is supplied from VIN or other power sources. 4/11 XC9106/XC9107 Series ELECTRICAL CHARACTERISTICS (Continued) XC9106D003MR, XC9107D003MR PARAMETER Output Voltage Reference Voltage Range FB Control Voltage Supply Voltage Range (*1) Operation Start Voltage Oscillation Start Voltage (*1) Operation Hold Voltage Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency Maximum Duty Ratio PFM Duty Ratio Efficiency Soft-start Time CE "High" Voltage CE "Low" Voltage EXT "High" ON Resistance EXT "Low" ON Resistance CE "High" Current CE "Low" Current FB "High" Current FB "Low" Current SYMBOL VOUT Vref VFB VDD VST1 VST2 VHLD IDD1 IDD2 ISTB FOSC MAXDTY PFMDTY EFFI TSS VCEH VCEL REXTH REXTL ICEH ICEL IFBH IFBL Vref = 0.8V Vref = 0.9V Vref = 2.5V VDD as shown right and (Vref applied voltage0.7V) Recommended circuit using 2SD1628, IOUT=1.0mA No external connections CE/Vref=0.9V, Voltage applied, FB=0V Recommended circuit using 2SD1628, IOUT=1.0mA Same as VST2, VDD=3.3V Same as IDD1, FB=1.2V Same as IDD1, CE/Vref=0V Same as IDD1 Same as IDD1 No Load (XC9106 series) Recommended circuit using XP161A1355 Vref=0.9V Same as IDD1 Same as IDD1 Same as IDD1, VEXT=VOUT-0.4V Same as IDD1, VEXT=0.4V Same as IDD2, CE=0.8V Same as IDD2, CE=2.5V Same as IDD2, CE=0V Same as IDD2, FB=VDD Same as IDD2, FB=1.0V (FOSC=300kHz) CONDITIONS Vref = 0.9V MIN. 8.820 0.8 0.784 0.882 2.450 1.8 255 75 24 5.0 0.65 -1.0 0.0 TYP. 9.000 0.800 0.900 2.500 62 16 300 81 32 85 10.0 24 16 MAX. 9.180 2.5 0.816 0.918 2.500 10.0 0.9 0.8 0.7 88 22 1.0 345 87 40 20.0 0.20 36 24 0.0 2.5 -0.1 0.1 -0.1 V V V V V V V A A A kHz % % % mS V V A A A A Ta=25 C UNITS CIRCUIT O - Test Conditions: Unless otherwise stated, CL: Ceramic, recommended MOSFET should be connected. VDD= 3.3V Vref= 0.09V, RFB1,2 x 10 3.3V IOUT= 50mA VIN= NOTE : *1: Although the IC starts step-up operations from a VDD of 0.8V, the output voltage and oscillation frequency are stabilized at VDD 1.8V and (Vref applied voltage0.7V). Therefore, a VDD of more than 1.8V and (Vref applied voltage0.7V) is recommended when VDD is supplied from VIN or other power sources. TYPICAL APPLICATION CIRCUIT NchPower MOSFET Rb Cb When obtaining VDD from a source other than VOUT, please insert a capacitor CDD between the VDD pin and the GND pin in order to provide stable operations. Please wire CL & CIN between the VOUT/VDD pin and the GND pin. Strengthen the wiring sufficiently. When using a capacitor other than ceramic or low ESR at CL, please take away RSENSE and short. Insert Rb and CB when using a bipolar NPN Transistor. 5/11 XC9106/XC9107 Series OPERATIONAL EXPLANATION The XC9106 / 07 series are reference voltage (Vref) apply external step-up DC/DC controller ICs. Output voltage will be set with external resistors (RFB1 and RFB2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications that need to vary voltage such as LCD power supply for PDA. 30 XC9106 / XC9107D xxx MR Soft Start Time : TSS (ms) [Example Computation] Vref = 0.9V, TSS = 8.65x0.9 + 2.21 = 10.0 ms 25 20 15 10 5 0 0.0 0.5 Reference Voltage Vref (V) 1.0 1.5 2.0 2.5 3.0 6/11 XC9106/XC9107 Series OPERATIONAL EXPLANATION (Continued) |
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