XC9106/XC9107 Series ETR0405_002 PWM Control,PWM/PFM Switching Control, Step-Up DC/DC Converters, Externally Applied Vref ☆GO-Compatible ■GENERAL DESCRIPTION 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 0.1Ω 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 1.0μA. ■APPLICATIONS ■FEATURES ●Power supply for LCDs ●PDAs ●Cellular phones ●Palmtop computers ●Portable audio systems ●Various multi-function power supplies 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 = 1.0μA (MAX.) Load Capacitors : Low ESR capacitors compatible Externally Applied Reference Voltage (Vref) Packages : SOT-25, USP-6B ■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE CHARACTERISTICS XC9107D003MR RSENSE : 100m Ω for Ceramic CL SD : MA737 * L : 10μH 25 RFB1 : 270k Ω V OUT (V) CFB : 27pF V OUT = 8V~25V IOUT = 30mA RFB2 : 30k Ω CIN Ceramic CL : 10μF 1 5 2 3 CE/Vref Circuit as lef t V DD =V IN =3.3V, IOUT=30mA 30 20 15 10 5 V IN = 3.3V 0 Nch Pow er MOS FET 2SK2159 0.0 1.0 XC9107D003MR 4 30 0.8V~2.5V D/A converter 25 V OUT (V) * RSENSE is of no use in light load (uncontinuous mode) applications such as a small LCD, even using ceramic capacitor. 0.5 1.5 2.0 Vref (V) 2.5 3.0 Circuit as left V DD =V IN =3.3V 2.5V 20 2.0V 15 1.5V 10 Vref=0.8V 5 0 0.1 1 10 IOUT (mA) 100 1000 1/11 XC9106/XC9107 Series ■PIN CONFIGURATION NC GND 5 4 FB 6 1 EXT NC 5 2 VDD 3 CE/VIEW 1 2 FB VDD *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. 3 CE/Vref SOT-25 (TOP VIEW) ■PIN ASSIGNMENT PIN NUMBER SOT-25 PIN USP-6B NAME FUNCTION 1 6 FB Output Resistor Connection 2 2 VDD Supply Voltage 3 4 CE/ Vref Serves as Both Chip Enable Pin and Reference Voltage Apply Pin. 4 3 GND Ground 5 1 EXT External Transistor Connection - 5 NC No Connection ■PRODUCT CLASSIFICATION ●Ordering Information XC9106D①②③④⑤ : PWM control XC9107D①②③④⑤ : PWM/PFM automatic switching control DESIGNATOR DESCRIPTION SYMBOL ① ② Reference Voltage (Apply External) 00 : Fixed ③ Oscillation Frequency 3 : 300kHz ④ ⑤ Packaging Types Device Orientation DESCRIPTION 1 : 100kHz M : SOT-25 D : USP-6B R L : Embossed tape, standard feed : Embossed tape, reverse feed * 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 Current Ripple Detect and FB FB Phase Compensation VDD PWM Comparator Error Amp. Vref with Soft Start, CE PWM/PFM Controller Buffer, Driver Ramp Wave Generator, OSC EXT GND CE / Vref 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 O Ta = 25 C RATINGS -0.3～12.0 -0.3～12.0 -0.3～12.0 -0.3～VDD+0.3 ±100 150 100 -40～+85 -55～+125 UNITS V V V V mA mW O O C C 3/11 XC9106/XC9107 Series ■ELECTRICAL CHARACTERISTICS XC9106D001MR, XC9107D001MR PARAMETER Output Voltage Reference Voltage Range SYMBOL VOUT FB Control Voltage VFB Supply Voltage Range (*1) VDD Operation Start Voltage VST1 Oscillation Start Voltage (*1) VST2 Operation Hold Voltage VHLD Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency Maximum Duty Ratio PFM Duty Ratio IDD1 IDD2 ISTB FOSC MAXDTY PFMDTY Efficiency EFFI Soft-start Time CE “High” Voltage CE “Low” Voltage EXT “High” ON Resistance EXT “Low” ON Resistance O Ta=25 C (FOSC=100kHz) CONDITIONS Vref = 0.9V MIN. 8.820 TYP. 9.000 MAX. 9.180 0.8 - 0.784 0.882 2.450 TSS VCEH VCEL 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 REXTH REXTL V ① 2.5 V - 0.800 0.900 2.500 0.816 0.918 2.550 V ④ 1.8 - 10.0 V - - - 0.9 V ③ - - 0.8 V ④ - - 0.7 V ③ 85 75 20 29 14 100 81 28 41 19 1.0 115 87 36 μA μA μA kHz % % ④ ④ ⑤ ④ ④ ① - 85 - % ① 5.0 0.65 - 10.0 - 20.0 0.20 mS V V ① ⑤ ⑤ Same as IDD1, VEXT=VOUT-0.4V - 24 36 Ω ④ Same as IDD1, VEXT=0.4V - 16 24 Ω ④ 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 -1.0 0.0 - - 0.0 2.5 -0.1 0.1 -0.1 μA ⑤ μA μA μA ⑤ ⑤ ⑤ Vref CE “High” Current ICEH CE “Low” Current FB “High” Current FB “Low” Current ICEL IFBH IFBL UNITS CIRCUIT Test Conditions: Unless otherwise stated, CL: Ceramic, recommended MOSFET should be connected. → Vref= 0.09V, RFB1,2×10 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 voltage＋0.7V). Therefore, a VDD of more than 1.8V and (Vref applied voltage＋0.7V) 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 SYMBOL VOUT FB Control Voltage VFB Supply Voltage Range (*1) VDD Operation Start Voltage VST1 Oscillation Start Voltage (*1) VST2 Operation Hold Voltage VHLD Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency Maximum Duty Ratio PFM Duty Ratio IDD1 IDD2 ISTB FOSC MAXDTY PFMDTY Efficiency EFFI Soft-start Time CE “High” Voltage CE “Low” Voltage EXT “High” ON Resistance EXT “Low” ON Resistance O Ta=25 C (FOSC=300kHz) CONDITIONS Vref = 0.9V MIN. 8.820 TYP. 9.000 MAX. 9.180 0.8 - 2.5 V 0.784 0.882 2.450 0.800 0.900 2.500 0.816 0.918 2.500 V 1.8 - 10.0 V - - 0.9 V - - 0.8 V - - 0.7 V 255 75 24 62 16 300 81 32 88 22 1.0 345 87 40 μA μA μA kHz % % - 85 - % TSS VCEH VCEL 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=3.3V 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 5.0 0.65 - 10.0 - 20.0 0.20 mS V V REXTH Same as IDD1, VEXT=VOUT-0.4V - 24 36 Ω REXTL Same as IDD1, VEXT=0.4V - 16 24 Ω ④ 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 -1.0 0.0 - - 0.0 2.5 -0.1 0.1 -0.1 μA ⑤ μA μA μA ⑤ ⑤ ⑤ Vref CE “High” Current ICEH CE “Low” Current FB “High” Current FB “Low” Current ICEL IFBH IFBL UNITS CIRCUIT V ① - ④ ③ ④ ③ ④ ④ ⑤ ④ ④ ① ① ① ⑤ ⑤ ④ Test Conditions: Unless otherwise stated, CL: Ceramic, recommended MOSFET should be connected. VDD= 3.3V → Vref= 0.09V, RFB1,2 × 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 voltage＋0.7V). Therefore, a VDD of more than 1.8V and (Vref applied voltage＋0.7V) is recommended when VDD is supplied from VIN or other power sources. ■TYPICAL APPLICATION CIRCUIT NchPower MOSFET 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. Rb Cb 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. <Error Amp.> Error amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In response to feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases. <OSC Generator> This circuit generates the internal reference clock. <Ramp Wave Generator> The ramp wave generator generates a saw-tooth waveform based on outputs from the OSC generator. <PWM Comparator> The PWM comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the Error amp's output is low, the external switch will be set to ON. <PWM / PFM Controller> This circuit generates PFM pulses. The PWM/PFM automatic switching mode switches between PWM and PFM automatically depending on the load. PWM/PFM control turns into PFM control when threshold voltage becomes lower than voltage of error amps. Noise is easily reduced with PWM control since the switching frequency is fixed. Because of the function, control suited to the application can easily be selected. The series suitable for noise sensitive portable audio equipment as PWM control can suppress noise during operation and PWM/PFM switching control can reduce consumption current during light loads in stand-by. <Vref 1 with Soft Start> The reference voltage of the XC9106/9107 series is adjusted and fixed by external applied voltage. (For output voltage settings, please refer to the output voltage setting.) To protect against inrush current, when the power is switched on, and also to protect against voltage overshoot, soft-start time is set internally to 10ms. It should be noted, however, that this circuit does not protect the load capacitor (CL) from inrush current. With the Vref voltage limited, and depending upon the input to error amp, the operation maintains a balance between the two inputs of error amps and controls the EXT pin's ON time so that it doesn't increase more than is necessary. The XC9106/9107 series alters soft start times by the setting value of reference voltage in order to protect against voltage overshoot and also to protect against inrush current. Please determine soft start time by the formula equation. XC9106 / XC9107D xxx MR TSS = 8.65×Vref + 2.21 [Example Computation] Vref = 0.9V, TSS = 8.65×0.9 + 2.21 = 10.0 ms Soft Start Time : TSS (ms) 30 25 20 15 10 5 0 0.0 0.5 1.0 1.5 2.0 Reference Voltage Vref (V) 2.5 3.0 <Enable Function> This function controls the operation and shutdown of the IC. When the voltage of the CE pin drops to 0.2V or less, disable mode will be entered, the IC's operations will stop and the EXT pin will be kept at a low level (the external N-ch MOSFET will be OFF). When the IC is in a state of chip disable, current consumption will be no more than 1.0μA. When the CE pin's voltage rises to 0.65V or more, enable mode will be entered and operations will recommence. The CE pin also doubles with reference voltage in the XC9106/9107 series, and the range of reference voltage can be varied externally from 0.8V to 2.5V. 6/11 XC9106/XC9107 Series ■OPERATIONAL EXPLANATION (Continued) <Output Voltage Setting> Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB1 and RFB2. The sum of RFB1 and RFB2 should normally be 2MΩ or less. The range of reference voltage of the series can be varied externally from 0.8V to 2.5V. VOUT = Vref applied voltage×(RFB1 + RFB2) / RFB2 The value of CFB1, speed-up capacitor for phase compensation, should result in fzfb = 1/(2π×CFB×RFB1) equal to 5 to 30kHz. Adjustments are required depending on the application, value of inductance (L), and value of load capacity (CL). fzfb = 30kHz (L=10μH) fzfb = 20kHz (L=22μH) fzfb = 10kHz (L=47μH) RFB1 : CFB : 270kΩ 20pF 27pF 56pF RFB2 : 30kΩ (fzfb = 30kHz, L = 10μH) (fzfb = 20kHz, L = 22μH) (fzfb = 10kHz, L = 47μH) <The Use of Ceramic Capacitor CL> The circuit of the XC9106/9107 series is organized by a specialized circuit, which reenacts negative feedback of both voltage and current. Also by insertion of approximately 100mΩ of a low and inexpensive sense resistor as current sense, a high degree of stability is possible even using a ceramic capacitor, a condition, which used to be difficult to achieve. Compared to a tantalum condenser, because the series can be operated in a very small capacity, it is suited to use of the ceramic capacitor, which is cheap and small. ■RECOMMENDED EXTERNAL COMPONENTS Tr: *When a MOSFET is used: 2SK2159 (N-ch Power MOSFET, NEC) Note* : With direct voltages over 4.5V, use the XP161A11A1PR. *When a NPN Tr. is used : 2SD1628 (SANYO) Rb : 500Ω (adjust with Tr's HFE or load) Cb : 2200pF (ceramic type) Cb ≦ 1 / (2π×Rb×FOSC×0.7) SD: L, CL : MA2Q737 (Schottky Diode type, MATSUSHITA) Adjust as below according to the condition and peripheral components When Ceramic capacitor is used: L: 22μH (CDRH5D28, SUMIDA, FOSC = 100kHz) 10μH (CDRH5D28, SUMIDA, FOSC = 300kHz) 10V, 10μF (Ceramic capacitor, LMK325BJ106ML, TAIYOYUDEN) CL : Use the formula below when step-up ratio and output current is large. CL = (CL standard value)×(IOUT(mA) / 300mA×VOUT / VIN) 100mΩ (FOSC = 300kHz) RSENSE : 50mΩ (FOSC = 100kHz) When Tantalum capacitor is used: L: 22μH (CDRH5D28, SUMIDA, FOSC = 300kHz) 47μH (CDRH5D28, SUMIDA, FOSC = 100kHz) Except when IOUT(mA) / 100mA×VOUT / VIN＞2 → 22μH CL: 16V, 47μF (Tantalum type 16MCE476MD2, NIPPONCHEMI) Use the formula below when step-up ratio and output current is large. CL = (CL standard value)×(IOUT(mA) / 300mA×VOUT / VIN) Not required, but short out the wire. RSENSE: When AL Electrolytic capacitor is used: L: 22μH (CDRH5D28, SUMIDA, FOSC = 300kHz) 47μH (CDRH5D28, SUMIDA, FOSC = 100kHz) Except when IOUT(mA) / 100mA×VOUT / VIN＞2 → 22μH CL: 16V, 100μF (AL electrolytic type)＋10V, 2.2μF (ceramic type) Strengthen appropriately when step-up ratio and output current is large. Not required, but short out the wire. RSENSE: CFB: Set up so that fzfb = 100kHz. 7/11 XC9106/XC9107 Series ■TEST CIRCUITS Circuit ① Circuit ④ SD RSENSE RP VOUT CP L OSC A CFB EXT VIN RFB1 VDD A CL Tr GND OSC V FB CE CIN RFB2 RL EXT VDD CE FB CDD GND Circuit ② Circuit ⑤ A L A CB VIN RSENSE OSC CFB EXT VDD A RFB1 A CL Tr CIN V FB CE RB GND RFB2 RL Circuit ③ SD L CB A CFB CIN VDD RFB1 A CL Tr VIN RSENSE OSC EXT RB V FB CE GND RFB2 RL 8/11 VDD EXT SD C CE E FB GND A A A XC9106/XC9107 Series ■PACKAGING INFORMATION ●SOT-25 (SOT-23-5) ●USP-6B 2.0 + 0.1 5 (0.45 ) 0.5 + 0.1 2 3 45 (0.27) (0.27) 6 5 4 (0.27) 45 O 1.8+0.15 A’ 1 AAA AAA ( 0.45) 1 A O φ (0.05 ) (0.45 ) (0.45 ) O +0.01 (0.65)-0.05 (0.05) -0.005 0.005+0.002 45 +0.15 (0.125) 45 O 1 6 1 1 1 1.0 +0.1 0.25 +0.1 . 0.1+0.03 5 1 1.6+0.15 4 2 0 3 0.5+0.1 0.5+0.1 A-A Cross Section 1 0.2+0.05 5-0.2+0.05 0.7 +0.0 3 0.25 + 0.1 Note: Pin1 is larger than the other pins. ●USP-6B Recommended Pattern Layout ●USP-6B Recommended Metal Mask Design 9/11 XC9106/XC9107 Series ■MARKING RULE ●SOT-25 ①②Represents product series 5 ① 1 4 ② ③ ④ 2 3 MARK PRODUCT SERIES ① ② 6 D XC9106D00xMx 7 D XC9107D00xMx SOT-25 (TOP VIEW) ③Represents oscillation frequency MARK OSCILLATION FREQUENCY PRODUCT SERIES 1 3 100kHz 300kHz XC9106/07D001Mx XC9106/07D003Mx ④Represents production lot number 0 to 9,A to Z reverse character 0 to 9,A to Z repeated (G, I, J, O, Q, W excepted) ●USP-6B ①②Represents product series MARK USP-6B (TOP VIEW) PRODUCT SERIES ① ② U D XC9106D00xDx L D XC9107D00xDx ③④Represents FB voltage MARK PRODUCT SERIES ③ ④ 0 0 XC9106D00xDx 0 0 XC9107D00xDx ⑤Represents oscillation frequency MARK OSCILLATION FREQUENCY PRODUCT SERIES 1 3 100kHz 300kHz XC9106/07D001Dx XC9106/07D003Dx ⑥Represents production lot number 0 to 9,A to Z repeated (G, I, J, O, Q, W excepted). Note: No character inversion used. 10/11 XC9106/XC9107 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. 11/11