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x CMOS Low Power Consumption x Operating Voltage: 0.9V~10.0V x Output Voltage Range: 2.0V~7.0V x Output Voltage Accuracy: 2.5% x Selectable Oscillator Frequency:
(50kHz, 100kHz, 180kHz)
s Applications
q Cellular phones, pagers q Palmtops q Cameras, video recorders q Portable equipment
s General Description
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.
s Features
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.
e
s Selection Guide
PART TYPE OPERATION MODE PWM/PFM PACKAGE SWITCHING RELATED Built-in Transistor "Lx"lead External Transitor "EXT"lead Built-in Transitor "Lx"lead External Transitor "EXT"lead Built-in Transitor "Lx"lead External Transitor "EXT"lead ADDITIONAL FUNCTION -----------FEATURES
* Switching transistor incorporated standard * PFM operation during light loads.
XC6372A
SOT-89-3
type.
XC6372B
PWM/PFM
SOT-89-3
------------
* External switching transistor standard type. * Adding external transistor can improve the
output capability up to several hundred mA.
* Stand-by
XC6372C
PWM/PFM
SOT-89-5
Chip Enable(CE)
(CE) function added version to the XC6372A * Stand-by current: 0.5A max.
* Stand-by
XC6372D
PWM/PFM
SOT-89-5
Chip Enable(CE) Separated "VDD"and"VOUT"leads Separated "VDD"and"VOUT"leads
(CE) function added version to the XC6372B * Stand-by current: 0.5A max.
* Individual
XC6372E
PWM/PFM
SOT-89-5
power supply and set-up voltage sensing leads are available power supply and set-up voltage sensing leads are available.
XC6372F
PWM/PFM
SOT-89-5
* Individual
s Pin Configuration
5 4
1
2 SOT-89 (TOP VIEW)
3
1
2 SOT-89-5 (TOP VIEW)
3
e
s Pin Assignment
(XC6372A, C6372B)
PIN NUMBER PIN NAME XC6372A 1 2 3 - XC6372B 1 2 - 3 VSS VOUT Lx EXT Ground Output voltage monitor / IC internal power supply Switch External switch transistor drive FUNCTION
(XC6372C, C6372D)
PIN NUMBER PIN NAME XC6372C 5 2 4 - 3 1 XC6372D 5 2 - 4 3 1 VSS VOUT Lx EXT CE NC Ground Output voltage monitor / IC internal power supply Switch External switch transistor drive Chip Enable No Connection FUNCTION
(XC6372E, C6372F)
PIN NUMBER PIN NAME XC6372E 5 2 4 - 3 1 XC6372F 5 2 - 4 3 1 VSS VDD Lx EXT VOUT NC Ground IC internal power supply Switch External switch transistor drive Output voltage monitor No Connection FUNCTION
s Block Diagram
XC6372A~XC6372D
(VOUT pin serves also as VDD.)
VLX limiter Buffer Slow Start VDD Vref Phase comp Buffer Vref Phase comp VLX limiter Slow Start
XC6372E and XC6372F
VDD VDD
LX
LX
PWM/PFM Control OSC 50/100/180kHz VSS
VOUT VSS
PWM/PFM Control OSC 50/100/180kHz
VOUT
EXT
Chip Enable
EXT
e
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.
s Absolute Maximum Ratings
PARAMETER VOUT Input Voltage Lx pin Voltage Lx pin Current EXT pin Voltage EXT pin Current CE Input Voltage VDD Input Voltage Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature SYMBOL VOUT VLX ILX VEXT IEXT VCE VDD Pd Topr Tstg RATINGS 12 12 400 VSS -- 0.3~VOUT+0.3 50 12 12 500
- 30~+80 - 40~+125
Ta=25: UNITS V V mA V mA V V mW : :
s Electrical Characteristics
XC6372A501PR
VOUT=5.0V,FOSC=100kHZ SYMBOL VOUT VIN VST1 VST2 CONDITIONS MIN 4.875 10 TYP 5.000 MAX 5.125 Ta=25: UNITS V V V V A A A A kHz % % V % 20.0 ms PARAMETER Output Voltage Maximum Input Voltage Operation Start-up Voltage Oscillation Start-up Voltage
External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Lx:10k pull-up to 5V. VIN=VOUT0.8, IOUT=0mA(Note1) Same as VST2. Apply output voltage0.95 to VOUT. Same as VST2. Apply output voltage1.1 to VOUT. Same as IDD1. VLX=0.4V. No external components. VOUT=VLX=10V. Same as IDD1. Measuring of LX waveform. Same as IDD1. Measuring of LX waveform. Same as IDD1. Measuring of LX waveform. Same as IDD1. Apply output voltage to Lx. Voltage required to produce FOSC 2. 12.8 80.2 8.2 1.4
0.90 0.80
e
No Load Input Current Supply Current 1 (Note2) Supply Current 2 LX Switch-On Resistance LX Leakage Current Oscillator Frequency(Note 3) Maximum Duty Ratio PFM Duty Ratio(Note 4) LX Limit Voltage
IIN IDD1 IDD2 RSWON ILXL FOSC MAXDTY PFMDTY VLxLMT
25.7 133.8 16.5 2.4 1.0
85 80 10 0.7
100 87 17
115 92 25 1.3
Efficiency Slow-Start Time
EFFI TSS 4.0
85 10.0
Measuring conditions: Unless otherwise specified,VIN=VOUT0.6, IOUT=50mA. See Typical Application Circuits, Fig.1. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0A 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
PARAMETER Output Voltage
VOUT=5.0V,FOSC=100kHZ SYMBOL VOUT VIN VST1 VST2 IDD1 IDD2 REXTH REXTL FOSC MAXDTY PFMDTY EFFI TSS External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Same as VST2. Apply output voltage0.95 to VOUT. Same as VST2. Apply output voltage1.1 to VOUT. Same as IDD1. VEXT=-0.4V. Same as IDD1. VEXT=0.4V. Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. 85 80 10 40.0 8.2 37.5 30 100 87 17 85 10.0 CONDITIONS MIN 4.875 10 TYP 5.000 MAX 5.125
Ta=25: UNITS V V V V A A kHz % % % ms
Maximum Input Voltage Operation Start-up Voltage Oscillation Start-up Voltage Supply Current 1 (Note1) Supply Current 2 EXT "High" On Resistance EXT "Low" On Resistance Oscillator Frequency (Note 2) Maximum Duty Ratio PFM Duty Ratio (Note 3) Efficiency Slow-Start Time
0.90 0.80 66.8 16.5 62.5 50 115 92 25
4.0
20.0
Measuring conditions: Unless otherwise specified,VIN=VOUT0.6, 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.
s Electrical Characteristics
XC6372C501PR
PARAMETER Output Voltage Maximum Input Voltage Operation Start-up Voltage Oscillation Start-up Voltage VOUT=5.0V,FOSC=100kHZ SYMBOL VOUT VIN VST1 VST2 External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Lx: 10k pull-up to 5V. No Load Input Current Supply Current 1 (Note2) Supply Current 2 LX Switch-On Resistance LX Leakage Current Oscillator Frequency(Note 3) Maximum Duty Ratio PFM Duty Ratio(Note 4) Stand-by Current CE"High" Voltage CE"Low" Voltage CE"High" Current CE"Low" Current LX Limit Voltage IIN IDD1 IDD2 RSWON ILXL FOSC MAXDTY PFMDTY ISTB VCEH VCEL ICEH ICEL VLXLMT VIN=VOUT0.8, IOUT=0mA(Note1) Same as VST2. Apply output voltage 0.95 to VOUT. Same as VST2. Apply output voltage 1.1 to VOUT. Same as IDD1. VLX=0.4V. No external components. VOUT=VLX=10V. Same as IDD1. Measuring of Lx waveform. Same as IDD1. Measuring of Lx waveform. Same as IDD1. Measuring of Lx waveform. Same as IDD1. Same as IDD1. Same as IDD1. Same as IDD1.VCE=VOUT0.95 Same as IDD1.VCE=0V. Same as IDD1. Apply output voltage to Lx. Voltage required to produce FOSC2. Efficiency Slow-Start Time EFFI TSS 4.0 85 10.0 20.0 % ms 0.7 0.75 0.20 0.25 -0.25 1.3 85 80 10 100 87 17 12.8 80.2 8.2 1.4 25.7 133.8 16.5 2.4 1.0 115 92 25 0.5 A A A A kHz % % A V V A A V CONDITIONS MIN 4.875 10 0.90 0.80 TYP 5.000 MAX 5.125 Ta=25: UNITS V V V V
e
Measuring conditions: Unless otherwise specified, connect CE to VOUT, VIN=VOUT0.6, IOUT=50mA. See Typical Application Circuits, Fig.3. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR) < 1.0A 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.
s Electrical Characteristics
XC6372D501PR
VOUT=5.0V,FOSC=100kHZ SYMBOL PARAMETER VOUT Output Voltage VIN VST1 External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Same as VST2. Apply output voltage 0.95 to VOUT. Same as VST2. Apply output voltage 1.1 to VOUT. Same as IDD1. VEXT=-0.4V Same as IDD1. VEXT=0.4V Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. Same as IDD1. Same as IDD1. Same as IDD1. Same as IDD1.VCE=VOUT0.95. Same as IDD1.VCE=0V. 85 4.0 10.0 20.0 0.75 0.20 0.25 -0.25 85 80 10 40.0 8.2 37.5 30 100 87 17 Ta=25: CONDITIONS MIN 4.875 10 0.90 TYP 5.000 MAX 5.125 UNITS V V V V
Maximum Input Voltage Operation Start-up Voltage
Oscillation Start-up Voltage
VST2 IDD1 IDD2 REXTH REXTL FOSC MAXDTY PFMDTY ISTB VCEH VCEL ICEH ICEL EFFI TSS
0.80
e
Supply Current 1 (Note1) Supply Current 2 EXT"High" On Resistance EXT"Low" On Resistance Oscillator Frequency (Note2) Maximum Duty Ratio PFM Duty Ratio (Note3) Stand-by Current CE"High" Voltage CE"Low" Voltage CE"High" Current CE"Low" Current Efficiency Slow-Start Time
66.8 16.5 62.5 50 115 92 25 0.5
A A kHz % % A V V A A % ms
Measuring conditions: Unless otherwise specified, connect CE to VOUT, VIN=VOUT0.6, 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.
s Electrical Characteristics
XC6372E501PR
VOUT=5.0V,FOSC=100kHZ SYMBOL PARAMETER CONDITIONS VOUT Output Voltage VIN Maximum Input Voltage VST1 Operation Start-up Voltage External Components Connected, IOUT=1mA. VST2 IIN IDD1 IDD2 RSWON ILXL FOSC MAXDTY PFMDTY VLXLMT No external components. Apply voltage to VOUT. VIN=VOUT0.8,IOUT=0mA(Note1) Same as VST2. Apply output voltage 0.95 to VOUT. Same as VST2. Apply output voltage 1.1 to VOUT. Same as IDD1. VOUT=VLX=0.4V. No external components. VOUT=VLX=10V. Same as IDD1. Measuring of Lx waveform. Same as IDD1. Measuring of Lx waveform. Same as IDD1. Measuring of Lx waveform. Same as IDD1 Apply output voltage to Lx. Voltage required to produce FOSC 2. Efficiency Slow-Start Time EFFI TSS 4.0 85 10.0 20.0 % ms 85 80 10 0.7 100 87 17 12.8 80.2 8.2 1.4 Ta=25: MIN 48.75 10 TYP 5.000 MAX UNITS V 5.125 V V 0.90 0.80 25.7 133.8 16.5 2.4 1.0 115 92 25 1.3 V A A A A kHz % % V
Oscillation Start-up Voltage No Load Input Voltage Supply Current 1(Note2) Supply Current 2 Lx Switch-On Resistance Lx Leakage Current Oscillator Frequency(Note 3) Maximum Duty Ratio PFM Duty Ratio(Note 4) Lx Limit Voltage
e
Measuring conditions: Unless otherwise specified, connect VDD to VOUT. VIN=VOUT0.6, IOUT=50mA. See Typical Application Circuits,Fig.5. Note: 1. The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0A 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
PARAMETER Output Voltage
VOUT=5.0V,FOSC=100kHZ SYMBOL VOUT VIN VST1 VST2 IDD1 IDD2 REXTH REXTL FOSC MAXDTY PFMDTY EFFI TSS 4.0 External Components Connected. IOUT=1mA. No external components. Apply voltage to VOUT. Same as VST2. Apply output voltage0.95 to VOUT. Same as VST2. Apply output voltage1.1 to VOUT. Same as IDD1. VEXT=VOUT-0.4V Same as IDD1. VEXT=0.4V Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. Same as IDD1. Measuring of EXT waveform. 85 80 10 40.0 8.2 37.5 30 100 87 17 85 10.0 20.0 CONDITIONS MIN 48.75 10 0.90 0.80 66.8 16.5 62.5 50 115 92 25 TYP 5.000 5.125
Ta=25: MAX UNITS V V V V A A kHz % % % ms
Maximum Input Voltage Operation Start-up Voltage Oscillation Start-up Voltage Supply Current 1(Note1) Supply Current 2 EXT "High" On Resistance EXT "Low" On Resistance Oscillator Frequency(Note2) Maximum Duty Ratio PFM Duty Ratio(Note3) Efficiency Slow-Start Time
Measuring conditions: Unless otherwise specified,connect VDD to VOUT,VIN=VOUT0.6, 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.
s Typical Application Circuits
SD L VOUT L SD VOUT
VIN SOT-89 (TOP VIEW)
+
CL
VIN
Tr SOT-89 (TOP VIEW) CB RB
+
CL
1
2
3
1
2
3
e
GND GND
L: 100H (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93)
L: SD: CL: RB: Tr:
47H (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47F (Tantalum capacitor, NICHICON, F93) 1k, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G
[Fig-1] XC6372A Application
[Fig-2] XC6372B Application
CE SD L 3 VIN (TOP VIEW) SOT-89-5 2 1 VOUT L 3 2 1 SD
CE VOUT
+
CL
VIN
Tr (TOP VIEW) SOT-89-5 CB RB 4 5
+
CL
4
5
GND
GND
L: 100H (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93)
L: SD: CL: RB: Tr:
47H (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47F(Tantalum capacitor, NICHICON, F93) 1k, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G
[Fig-3] XC6372C Application
[Fig-4] XC6372D Application
SD L 3 2 1
VOUT L
SD
VOUT
3 Tr
2
1
VIN
(TOP VIEW) SOT-89-5
+
CL 5
VDD
VIN CB RB 4
(TOP VIEW) SOT-89-5
+
CL 5
VDD
4
GND
GND
e
L: 100H (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93)
L: SD: CL: R: Tr:
47H (SUMIDA, CD-54) MA735 (Schottky diode; MATSUSHITA) 16V 47F (Tantalum capacitor, NICHICON, F93) 1k, CB:3300pF (FOSC=100kHz) 2SC3279, 2SD1628G
[Fig-5] XC6372E Application
[Fig-6] XC6372F Application
s Electrical Characteristics
OUTPUT VOLTAGE:VOUT(V)
e
EFFICIENCY(%)
OUTPUT CURRENT: IOUT (mA)
OUTPUT CURRENT: IOUT (mA)
RIPPLE VOLTAGE: Vr (mVp-p)
INTPUT CURRENT: IIN (A)
INPUT VOLTAGE: VIN (V)
OUTPUT CURRENT: IOUT (mA)
Note: Please refer to the XC6371 series application notes for more detailed information and data (www.torex.co.jp)

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