XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters HP010199 ■ Applications ◆ CMOS Low Power Consumption ◆ Operating Voltage: 0.9V~10.0V ◆ Output Voltage Range: 2.0V~7.0V ◆ Output Voltage Accuracy: ±2.5% ◆ Selectable Oscillator Frequency: ● Cellular phones, pagers ● Palmtops ● Cameras, video recorders ● Portable equipment (50kHz, 100kHz, 180kHz) ■ General Description ■ Features The XC6372 series, unlike the conventional PWM controlled converters, are a group of step-up DC/DC converters that automatically change their operation modes into PFM modes while loads are light, such as when the duty ratios are less than 10%. When loads are light, as in the stand-by mode, the XC6372 changes to PFM control so as to decrease oscillator frequencies, resulting in reduced supply current. Therefore, the XC6372 is suitable for use with portable equipment that requires the PWM controlled performance of low ripple and high output current, and a supply current that varies between low and high. Built-in proprietary phase compensation and slow start-up circuits ensure excellent transient response and improved performance. Output voltage can be selected from 2.0V to 7.0V in 0.1V increments (accuracy: ±2.5%). Oscillator frequency is also selectable from three frequencies; 50, 100, and 180kHz (accuracy: ±15%). Every built-in switching transistor type enables a step-up circuit to be configured using only three external components; a coil, a diode, and a capacitor. External transistor versions are available to accommodate high output current applications. SOT-89 small package. Operating (start-up) voltage range:0.9V~10V Output voltage range: 2.0V~7.0V in 0.1V increments Highly accurate: Set-up voltage ±2.5% Oscillator frequency: 50kHz, 100kHz, 180kHz (±15%) selectable Maximum output currents (Tr built-in): Typ.100mA at VIN=3.0,VOUT=5.0V....Note(1) Highly efficient (Tr built-in): Typ.85% at VIN=3.0V, VOUT=5.0V.....Note(1) Both switching transistor built-in and external Tr types are available. Five-lead packaged units offer either Chip Enable or independent VOUT pin option. Phase compensation and slow startup circuits included. Small package: SOT-89 mini-power mold (3-pin, 5-pin) Note(1): Performance depends on external components and PCB layout. ■ Selection Guide PART TYPE OPERATION MODE PACKAGE SWITCHING RELATED ADDITIONAL FUNCTION XC6372A PWM/PFM SOT-89-3 Built-in Transistor "Lx"lead ------------ XC6372B PWM/PFM SOT-89-3 External Transitor "EXT"lead ------------ FEATURES • Switching transistor incorporated standard • PFM operation during light loads. type. • External switching transistor standard type. • Adding external transistor can improve the output capability up to several hundred mA. • Stand-by (CE) function added version to the XC6372A • Stand-by current: 0.5µA max. XC6372C PWM/PFM SOT-89-5 Built-in Transitor "Lx"lead Chip Enable(CE) XC6372D PWM/PFM SOT-89-5 External Transitor "EXT"lead Chip Enable(CE) XC6372E PWM/PFM SOT-89-5 Built-in Transitor "Lx"lead Separated "VDD"and"VOUT"leads • Individual XC6372F PWM/PFM SOT-89-5 External Transitor "EXT"lead Separated "VDD"and"VOUT"leads • Individual • Stand-by 215 (CE) function added version to the XC6372B • Stand-by current: 0.5µA max. power supply and set-up voltage sensing leads are available power supply and set-up voltage sensing leads are available. e-52 XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters ■ Pin Configuration 5 1 2 3 1 SOT-89 (TOP VIEW) 4 2 3 SOT-89-5 (TOP VIEW) ■ Pin Assignment (XC6372A, C6372B) PIN NUMBER PIN NAME FUNCTION 1 VSS Ground 2 2 VOUT Output voltage monitor / IC internal power supply 3 – Lx Switch – 3 EXT External switch transistor drive PIN NAME FUNCTION XC6372A XC6372B 1 (XC6372C, C6372D) PIN NUMBER XC6372C XC6372D 5 5 VSS Ground 2 2 VOUT Output voltage monitor / IC internal power supply 4 – Lx Switch – 4 EXT External switch transistor drive 3 3 CE Chip Enable 1 1 NC No Connection PIN NAME FUNCTION (XC6372E, C6372F) PIN NUMBER e-53 XC6372E XC6372F 5 5 VSS Ground 2 2 VDD IC internal power supply 4 – Lx Switch – 4 EXT External switch transistor drive 3 3 VOUT Output voltage monitor 1 1 NC No Connection 216 ■ Block Diagram XC6372A~XC6372D XC6372E and XC6372F (VOUT pin serves also as VDD.) VDD VDD LX LX VLX limiter Slow Start VLX limiter Slow Start VDD Buffer Buffer Vref Vref VOUT VSS PWM/PFM Control OSC 50/100/180kHz VOUT Phase comp PWM/PFM Control OSC 50/100/180kHz VSS EXT Phase comp EXT Chip Enable CE Note: 1. Built-in transistor type units use the Lx pin. External transistor type units use the EXT pin. 2. The CE pin is only used with the XC6372C and XC6372D. Note: 1. The VDD pin is only used with the XC6372E and XC6372F . 2. Built-in transistor type units use the Lx pin. External transistor type units use the EXT pin. ■ Absolute Maximum Ratings Ta=25: PARAMETER SYMBOL RATINGS UNITS V OUT Input Voltage V OUT 12 V Lx pin Voltage V LX 12 V Lx pin Current I LX 400 mA EXT pin Voltage V EXT V SS — 0.3~V OUT +0.3 V EXT pin Current I EXT ±50 mA CE Input Voltage V CE 12 V V DD Input Voltage V DD 12 V Continuous Total Power Dissipation Pd 500 mW Operating Ambient Temperature T opr – 30~+80 : Storage Temperature T stg – 40~+125 : 217 e-54 XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters ■ Electrical Characteristics XC6372A501PR VOUT=5.0V,FOSC=100kHZ PARAMETER Output Voltage Maximum Input Voltage SYMBOL VOUT VIN Operation Start-up Voltage VST1 Oscillation Start-up Voltage VST2 No Load Input Current Supply Current 1 (Note2) IIN Ta=25: CONDITIONS MIN 4.875 10 MAX 5.125 UNITS V V 0.90 V 0.80 V 12.8 25.7 µA 80.2 133.8 µA TYP 5.000 External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Lx:10kΩ pull-up to 5V. IDD1 VIN=VOUT✕0.8, IOUT=0mA(Note1) Same as VST2. Apply output voltage✕0.95 to VOUT. Supply Current 2 IDD2 Same as VST2. Apply output voltage✕1.1 to VOUT. 8.2 16.5 µA LX Switch-On Resistance RSWON Same as IDD1. VLX=0.4V. 1.4 2.4 Ω No external components. VOUT=VLX=10V. Same as IDD1. Measuring of LX waveform. 1.0 µA LX Leakage Current ILXL Oscillator Frequency(Note 3) FOSC Maximum Duty Ratio MAXDTY PFM Duty Ratio(Note 4) PFMDTY Same as IDD1. Measuring of LX waveform. Same as IDD1. Measuring of LX waveform. LX Limit Voltage VLxLMT Same as IDD1. Apply output voltage to Lx. Efficiency EFFI Slow-Start Time TSS 85 100 115 kHz 80 87 92 % 10 17 25 % 1.3 V 20.0 ms 0.7 Voltage required to produce FOSC ✕ 2. % 85 4.0 10.0 Measuring conditions: Unless otherwise specified,VIN=VOUT✕0.6, IOUT=50mA. See Typical Application Circuits, Fig.1. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0µA at reverse voltage (VR)=10.0V 2. "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates which results in less average power consumption. The current actually provided by an external VIN source is represented by "No-Load Input Current(IIN)". 3. When PWM operates. 4. When PFM operates. XC6372B501PR VOUT=5.0V,FOSC=100kHZ PARAMETER Output Voltage SYMBOL VOUT Maximum Input Voltage VIN Operation Start-up Voltage VST1 Oscillation Start-up Voltage VST2 Supply Current 1 (Note1) IDD1 Supply Current 2 Ta=25: MAX 5.125 UNITS V V External Components Connected. IOUT=1mA. 0.90 V No external components. Apply voltage to VOUT. 0.80 V CONDITIONS MIN 4.875 10 TYP 5.000 40.0 66.8 µA IDD2 Same as VST2. Apply output voltage✕0.95 to VOUT. Same as VST2. Apply output voltage✕1.1 to VOUT. 8.2 16.5 µA EXT "High" On Resistance REXTH Same as IDD1. VEXT=–0.4V. 37.5 62.5 Ω EXT "Low" On Resistance REXTL Same as IDD1. VEXT=0.4V. 30 50 Ω Oscillator Frequency (Note 2) FOSC Same as IDD1. Measuring of EXT waveform. 85 100 115 kHz Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of EXT waveform. 80 87 92 % PFM Duty Ratio (Note 3) PFMDTY Same as IDD1. Measuring of EXT waveform. 10 17 25 % Efficiency Slow-Start Time EFFI TSS 4.0 85 10.0 20.0 % ms Measuring conditions: Unless otherwise specified,VIN=VOUT✕0.6, IOUT=50mA. See Typical Application Circuits, Fig.2. Note: 1. "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates which results in less average power consumption. 2. When PWM operates. 3. When PFM operates. e-55 218 ■ Electrical Characteristics XC6372C501PR VOUT=5.0V,FOSC=100kHZ PARAMETER SYMBOL Output Voltage Ta=25: CONDITIONS MIN TYP MAX UNITS VOUT 4.875 5.000 5.125 V Maximum Input Voltage VIN 10 Operation Start-up Voltage VST1 External Components Connected. IOUT=1mA. 0.90 V Oscillation Start-up Voltage VST2 No external components. Apply voltage to VOUT. 0.80 V V Lx: 10k Ω pull-up to 5V. No Load Input Current IIN VIN=VOUT✕0.8, IOUT=0mA(Note1) 12.8 25.7 µA Supply Current 1 (Note2) IDD1 Same as VST2. Apply output voltage ✕ 0.95 to VOUT. 80.2 133.8 µA Supply Current 2 IDD2 Same as VST2. Apply output voltage ✕ 1.1 to VOUT. 8.2 16.5 µA LX Switch-On Resistance RSWON Same as IDD1. VLX=0.4V. 1.4 2.4 Ω LX Leakage Current ILXL No external components. VOUT=VLX=10V. 1.0 µA Oscillator Frequency(Note 3) FOSC Same as IDD1. Measuring of Lx waveform. 85 100 115 kHz Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of Lx waveform. 80 87 92 % PFM Duty Ratio(Note 4) PFMDTY Same as IDD1. Measuring of Lx waveform. 10 17 25 % Stand-by Current ISTB Same as IDD1. 0.5 µA CE"High" Voltage VCEH Same as IDD1. CE"Low" Voltage VCEL Same as IDD1. 0.20 V CE"High" Current ICEH Same as IDD1.VCE=VOUT✕0.95 0.25 µA CE"Low" Current ICEL Same as IDD1.VCE=0V. –0.25 µA LX Limit Voltage VLXLMT Same as IDD1. Apply output voltage to Lx. 1.3 V 0.75 V 0.7 Voltage required to produce FOSC✕2. Efficiency EFFI Slow-Start Time TSS 85 4.0 10.0 % 20.0 ms Measuring conditions: Unless otherwise specified, connect CE to VOUT, VIN=VOUT✕0.6, IOUT=50mA. See Typical Application Circuits, Fig.3. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR) < 1.0µA at reverse voltage (VR) =10.0V 2. "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates which results in less average power comsumption. The current actually provided by an external VIN source is represented by "No-Load Input Current (IIN)". 3. When PWM operates. 4. When PFM operates. 219 e- 56 XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters ■ Electrical Characteristics XC6372D501PR VOUT=5.0V,FOSC=100kHZ SYMBOL PARAMETER VOUT Output Voltage Ta=25: CONDITIONS MIN TYP MAX UNITS 4.875 5.000 5.125 V Maximum Input Voltage VIN Operation Start-up Voltage VST1 External Components Connected. IOUT=1mA. 0.90 V Oscillation Start-up Voltage VST2 No external components. Apply voltage to VOUT. 0.80 V Supply Current 1 (Note1) IDD1 Same as VST2. Apply output voltage ✕ 0.95 to VOUT. 40.0 66.8 µA Supply Current 2 IDD2 Same as VST2. Apply output voltage ✕ 1.1 to VOUT. 8.2 16.5 µA EXT"High" On Resistance REXTH Same as IDD1. VEXT=–0.4V 37.5 62.5 Ω EXT"Low" On Resistance REXTL Same as IDD1. VEXT=0.4V 30 50 Ω Oscillator Frequency (Note2) FOSC Same as IDD1. Measuring of EXT waveform. 85 100 115 kHz Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of EXT waveform. 80 87 92 % PFM Duty Ratio (Note3) PFMDTY Same as IDD1. Measuring of EXT waveform. 10 17 25 % Stand-by Current ISTB Same as IDD1. 0.5 µA CE"High" Voltage VCEH Same as IDD1. CE"Low" Voltage VCEL Same as IDD1. 0.20 V CE"High" Current ICEH Same as IDD1.VCE=VOUT✕0.95. 0.25 µA CE"Low" Current ICEL Same as IDD1.VCE=0V. –0.25 µA Efficiency EFFI Slow-Start Time TSS V 10 0.75 V % 85 4.0 10.0 20.0 ms Measuring conditions: Unless otherwise specified, connect CE to VOUT, VIN=VOUT✕0.6, IOUT=50mA See Typical Application Circuits,Fig.4. Note: 1. "Supply Current 1" is the current while the oscillator is continuously oscillating. In an actual operation the oscillator periodically operates which results in less average power consumption. 2. When PWM operates. 3. When PFM operates. e-57 220 ■ Electrical Characteristics Ta=25: XC6372E501PR VOUT=5.0V,FOSC=100kHZ SYMBOL CONDITIONS VOUT VIN Maximum Input Voltage V ST1 Operation Start-up Voltage External Components Connected, IOUT=1mA. PARAMETER Output Voltage Oscillation Start-up Voltage VST2 No external components. Apply voltage to VOUT. No Load Input Voltage IIN Supply Current 1(Note2) IDD1 Supply Current 2 IDD2 VIN=VOUT✕0.8,IOUT=0mA(Note1) Same as VST2. Apply output voltage ✕0.95 to VOUT. Same as VST2. Apply output voltage ✕1.1 to VOUT. Lx Switch-On Resistance RSWON Same as IDD1. VOUT=VLX=0.4V. Lx Leakage Current ILXL No external components. VOUT=VLX=10V. Oscillator Frequency(Note 3) FOSC Same as IDD1. Measuring of Lx waveform. Maximum Duty Ratio MAXDTY PFM Duty Ratio(Note 4) PFMDTY Lx Limit Voltage VLXLMT Same as IDD1. Measuring of Lx waveform. Same as IDD1. Measuring of Lx waveform. Same as IDD1 Apply output voltage to Lx. Efficiency EFFI Slow-Start Time TSS MIN 48.75 10 TYP 5.000 MAX UNITS V 5.125 V V 0.90 0.80 V 12.8 25.7 µA 80.2 133.8 µA 8.2 16.5 µA 1.4 2.4 Ω 1.0 µA 85 100 115 kHz 80 87 92 % 10 17 25 % 1.3 V 20.0 % ms 0.7 Voltage required to produce FOSC ✕ 2. 4.0 85 10.0 Measuring conditions: Unless otherwise specified, connect VDD to VOUT. VIN=VOUT✕0.6, IOUT=50mA. See Typical Application Circuits,Fig.5. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0µA at reverse voltage (VR)=10.0V 2. "Supply current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates which results in less average power consumption. The current actually provided by external VIN source is represented by "No-Load Input Current (IIN)". 3. When PWM operates. 4. When PFM operates. ❈When the VDD and VOUT pins are independently used, the voltage range at the VDD pin should be 2.2V to 10V. The IC operates from VDD=0.8V. However, output voltage and oscillator frequency are properly stabilized when VDD=2.2V or higher. XC6372F501PR VOUT=5.0V,FOSC=100kHZ Ta=25: MIN TYP MAX UNITS VOUT 48.75 5.000 5.125 Maximum Input Voltage VIN 10 Operation Start-up Voltage VST1 External Components Connected. IOUT=1mA. 0.90 V Oscillation Start-up Voltage VST2 No external components. Apply voltage to VOUT. 0.80 V Supply Current 1(Note1) IDD1 Supply Current 2 PARAMETER SYMBOL Output Voltage CONDITIONS V V 40.0 66.8 µA IDD2 Same as VST2. Apply output voltage✕0.95 to VOUT. Same as VST2. Apply output voltage✕1.1 to VOUT. 8.2 16.5 µA EXT "High" On Resistance REXTH Same as IDD1. VEXT=VOUT–0.4V 37.5 62.5 Ω EXT "Low" On Resistance REXTL Same as IDD1. VEXT=0.4V 30 50 Ω Oscillator Frequency(Note2) FOSC Same as IDD1. Measuring of EXT waveform. 85 100 115 kHz Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of EXT waveform. 80 87 92 % PFM Duty Ratio(Note3) PFMDTY Same as IDD1. Measuring of EXT waveform. 10 17 25 % Efficiency EFFI Slow-Start Time TSS 85 4.0 10.0 % 20.0 ms Measuring conditions: Unless otherwise specified,connect VDD to VOUT,VIN=VOUT✕0.6, IOUT=50mA. See Typical Application Circuits,Fig.6. Note: 1. "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In an actual operation the oscillator periodically operates which results in less average power consumption. 2. When PWM operates. 3. When PFM operates. ❈When the VDD and VOUT pins are independently used, the voltage range at the VDD pin should be 2.2V to 10V. The IC operates from VDD=0.8V. However, output voltage and oscillator frequency are properly stabilized when VDD=2.2V or higher. 221 e-58 XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters ■ Typical Application Circuits SD SD VOUT L VOUT L VIN 1 2 Tr VIN + SOT-89 (TOP VIEW) + SOT-89 (TOP VIEW) CL CB 3 RB 1 2 CL 3 GND GND L: 100µH (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47µF (Tantalum capacitor, NICHICON, F93) L: SD: CL: RB: Tr: 47µH (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47µF (Tantalum capacitor, NICHICON, F93) 1kΩ, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G [Fig-1] XC6372A Application [Fig-2] XC6372B Application CE SD CE SD VOUT L L 3 2 1 3 VIN VIN + (TOP VIEW) SOT-89-5 2 1 Tr + (TOP VIEW) SOT-89-5 CL CB 4 5 GND CL RB 4 5 GND L: 100µH (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47µF (Tantalum capacitor, NICHICON, F93) L: SD: CL: RB: Tr: [Fig-3] XC6372C Application e-59 VOUT 47µH (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47µF(Tantalum capacitor, NICHICON, F93) 1kΩ, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G [Fig-4] XC6372D Application 222 SD SD VOUT L VOUT L 3 2 1 3 2 1 Tr (TOP VIEW) SOT-89-5 VIN + VDD (TOP VIEW) SOT-89-5 VIN + CL CB 4 5 RB 4 5 GND GND L: 100µH (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47µF (Tantalum capacitor, NICHICON, F93) VDD CL L: SD: CL: R: Tr: [Fig-5] XC6372E Application 47µH (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47µF (Tantalum capacitor, NICHICON, F93) 1kΩ, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G [Fig-6] XC6372F Application 223 e-60 XC6372 Series Dual Mode [PWM/PFM] Step-up DC/DC Converters (1)OUTPUT VOLTAGE vs. OUTPUT CURRENT (2)EFFICIENCY vs. OUTPUT CURRENT XC6372A301 XC6372A301 L=100µH,C=47µF(Tantalum) L=100µH,C=47µF(Tantalum) 100 80 2.9 2.0V VIN=1.0V EFFICIENCY(%) OUTPUT VOLTAGE:VOUT(V) 3.1 1.5V 2.7 2.0V 60 40 VIN=1.0V 20 2.5 0 0 40 80 120 160 200 0 OUTPUT CURRENT:IOUT(mA) 120 160 XC6372A301 XC6372A301 L=100µH,C=47µF(Tantalum) L=100µH,C=47µF(Tantalum) 200 100 RIPPLE VOLTAGE:Vr(mVp-p) INTPUT CURRENT:IIN(µA) 80 (4)RIPPLE VOLTAGE vs. OUTPUT CURRENT 200 150 100 50 0 1.0 40 OUTPUT CURRENT:IOUT(mA) (3)NO LAOD INPUT CURENT vs. INPUT VOLTAGE 1.2 1.4 1.6 1.8 80 60 2.0V 1.5V 40 VIN=1.0V 10 0 0 2.0 INPUT VOLTAGE:VIN(V) e-61 1.5V 40 80 120 160 OUTPUT CURRENT:IOUT(mA) 224 200