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| x Pager Use: Low Noise x Duty Ratio: 75% x CMOS Structure: Small Supply Current x Operating Voltage Range: 0.9~10.0V x Output Voltage Range: 2.0~7.0V x Output Voltage Accuracy: 2.5% s General Description The XC6385 series is a group of PFM (frequency) controlled step-up DC/DC converters. The XC6385 series employs CMOS process and laser trimming technologies to attain low power and high accuracy. A common problem among pagers is one of noise, but with the XC6385, high frequency noise that occurs during switching is reduced. Output voltage is programmable in 0.1V steps between 2.0V ~ 7.0V and maximum frequency is 100kHz (typ.) With a built-in switching transistor, a step-up circuit can be configured using a coil, diode and capacitor connected externally. Also available is a CE (chip enable) function that reduces power consumption during shut-down mode, and an independent VDD pin function (separated power supply and voltage detect pins) for fly-back circuits. SOT-89-5 and SOT-23/25 small packages. s Applications q Pagers q Palmtops q Cameras, Video cameras q Various portable products s Features Low noise Operating voltage range: 0.9V~10V Output voltage range: 2.0V~7.0V (programmable in 0.1V steps) Output voltage accuracy: 2.5% Maximum oscillator frequency: 100kHz (15%) Built-in switching transistor CE function and/or separated VDD/VOUT types selectable with 5 pin packages Small package: SOT-23/25 mini-mold (3pin, 5pin) SOT-89/89-5 mini-power mold (3 pin, 5 pin) e s Absolute Maximum Ratings PARAMETER VOUT Pin Voltage LX Pin Voltage LX Pin Current CE Pin Voltage VDD Pin Voltage Continuous Total Power Dissipation SOT-23 SOT-89 SYMBOL VOUT VLX ILX VCE VDD Pd Pd Topr Tstg RATINGS 12 12 400 VSS-0.3 ~ VOUT+0.3 12 150 500 -30 ~ +80 -40 ~ +125 Ta=25: UNITS V V mA V V mW mW : : Operating Ambient Temperature Storage Temperature s Selection Guide PARAT TYPE XC6385A DUTY RATIO 75% PACKAGE SOT-23 SOT-89-3 SOT-23 SOT-89-5 SWITCHING CE TRANSISTOR FUNCTION Built-in NO VDD PIN NO FEATURES Duty Ratio 75% Stand-by (CE) function During stand-by (CE pin "Low"), Supply current = 0.50A (max) Since the power supply (VDD) pin and the voltage sensor (VOUT) pin are separated, use as a PFM controller is possible. XC6385C 75% Built-in YES NO XC6385E 75% SOT-23 SOT-89-5 Built-in NO YES s Pin Configuration 5 3 5 4 4 1 SOT-23 (TOP VIEW) 2 1 2 3 1 2 SOT-89-3 (TOP VIEW) 3 1 2 SOT-89-5 (TOP VIEW) 3 SOT-25 (TOP VIEW) e Note: The SOT-23/25 and SOT-89 packages shown above are not drawn to scale. s Pin Assignment XC6385A PIN NUMBER SOT-23 1 3 2 SOT-89-3 1 2 3 PIN NAME VSS VOUT Lx FUNCTION Ground Output voltage monitor, IC internal power supply Switch XC6385C PIN NUMBER SOT-25 4 2 5 1 3 SOT-89-5 5 2 4 3 1 PIN NAME VSS VOUT Lx CE NC FUNCTION Ground Output voltage monitor, IC internal power supply Switch Chip enable No connection XC6385E PIN NUMBER SOT-25 4 2 SOT-89-5 5 2 PIN NAME VSS VDD FUNCTION Ground IC internal power supply s Block Diagram XC6385A~XC6385C (VOUT pin also serves as VDD.) VDD LX Buffer VLx limiter Vref VOUT PFM Control OSC 100kHz VSS e Chip Enable CE Note: The CE pin is set up for XC6385C. XC6383E VDD VDD LX Buffer VLx limiter Vref VOUT PFM Control OSC 100/180kHz VSS Note: The VDD pin is set up for XC6385E. s Electrical Characteristics XC6385A301PR PARAMETER Output Voltage Maximum Input Voltage Operation Start-up Voltage Operation Hold Voltage No-Load Input Current Supply Current 1(Note2) Supply Current 2 VOUT=3.0V SYMBOL VOUT VIN VST VHLD IIN IDD1 IDD2 CONDITIONS External components connected. MIN TYP 2.94 3.000 Ta=25: MAX UNITS V 3.06 0.90 9.3 39.4 4.2 7.9 1.0 70 85 0.7 80 75 100 80 115 1.1 V V V A A A A % kHz V % 10 External components connected. IOUT=1mA 0.80 External components connected. IOUT=1mA 0.70 VIN=output voltage x 0.6, IOUT=0mA (Note1) 4.6 No external components. Apply output voltage x 0.95 to VOUT 19.7 2.1 5.2 e No external components. Apply output voltage x 0.95 to VOUT LX Switch-On Resistance RSWON No external components. Apply output voltage x 0.95 to VOUT VLX=0.4V ILXL No external components. VOUT=VLX=10V. LX Leakage Current No external components. Apply output voltage x 0.95 to VOUT Duty Ratio DTY LX : 300 pull-up to 5V, Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT LX : 300 pull-up to 5V. Duty ratio 75%. Maximum Oscillation Frequency MAX FOSC Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT LX Limit Voltage VLxLMT Apply voltage to Lx. Voltage required to produce FOSC x 2. Efficiency (Note3) EFFI External components connected Measuring conditions: Unless otherwise specified, VIN=VOUT 0.6, IOUT=4mA. 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. 3. {[Output Voltage] x [Output Current] / [(Input Voltage) x (Input Current)]} x 100. XC6385C301PR PARAMETER Output Voltage VOUT=3.0V SYMBOL VOUT VIN VST VHLD IIN IDD1 IDD2 CONDITIONS External components connected. MIN TYP 2.94 3.000 10 External components connected. IOUT=1mA 0.80 External components connected. IOUT=1mA 0.70 VIN=output voltage x 0.6, IOUT=0mA (Note1) 4.6 No external components. Apply output voltage x 0.95 to VOUT 19.7 2.1 5.2 Ta=25: MAX UNITS V 3.06 0.90 9.3 39.4 4.2 7.9 1.0 75 100 80 115 0.5 V V V A A A A % kHz A V 0.20 0.25 -0.25 1.1 80 V A A V % Maximum Input Voltage Operation Start-up Voltage Operation Hold Voltage No-Load Input Current Supply Current 1(Note2) Supply Current 2 No external components. Apply output voltage x 0.95 to VOUT LX Switch-On Resistance RSWON No external components. Apply output voltage x 0.95 to VOUT VLX=0.4V LX Leakage Current ILXL No external components. VOUT=VLX=10V. No external components. Apply output voltage x 0.95 to VOUT Duty Ratio DTY 70 LX : 300 pull-up to 5V, Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT LX : 300 pull-up to 5V. Duty ratio 75%. Maximum Oscillation Frequency MAX FOSC 85 Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT Stand-by Current ISTB VCE=0V No external components. Apply output voltage x 0.95 to VOUT 0.72 CE "High" Voltage VCEH LX : 300 pull-up to 5V. Exixtence of LX oxcillation. No external components. Apply output voltage x 0.95 to VOUT CE "Low" Voltage VCEL LX : 300 pull-up to 5V. Exixtence of LX oxcillation. No external components. Apply output voltage x 0.95 to VOUT CE "High" Current ICEH LX : 300 pull-up to 5V. VCE=output voltage x 0.95 No external components. Apply output voltage x 0.95 to VOUT CE "Low" Current ICEL LX : 300 pull-up to 5V. VCE=0V. No external components. Apply output voltage x 0.95 to VOUT 0.7 VLxLMT LX Limit Voltage Apply voltage to Lx. Voltage required to produce FOSC x 2. External components connected Efficiency (Note3) EFFI Measuring conditions: Unless otherwise specified, VIN=VOUT 0.6, IOUT=4mA. See Typical Application Circuits, Fig.2. 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. 3. {[Output Voltage] x [Output Current] / [(Input Voltage) x (Input Current)]} x 100. s Electrical Characteristics XC6385E301PR PARAMETER Output Voltage Maximum Input Voltage Operation Start-up Voltage Operation Hold Voltage No-Load Input Current Supply Current 1(Note2) Supply Current 2 VOUT=3.0V SYMBOL VOUT VIN VST VHLD IIN IDD1 IDD2 CONDITIONS External components connected. MIN TYP 2.94 3.000 Ta=25: MAX UNITS V 3.06 0.90 9.3 39.4 4.2 7.9 1.0 70 85 0.7 80 75 100 80 115 1.1 V V V A A A A % kHz V % 10 External components connected. IOUT=1mA 0.80 External components connected. IOUT=1mA 0.70 VIN=output voltage x 0.6, IOUT=0mA (Note1) 4.6 No external components. Apply output voltage x 0.95 to VOUT 19.7 2.1 5.2 No external components. Apply output voltage x 0.95 to VOUT LX Switch-On Resistance RSWON No external components. Apply output voltage x 0.95 to VOUT VLX=0.4V ILXL No external components. VOUT=VLX=10V. LX Leakage Current No external components. Apply output voltage x 0.95 to VOUT Duty Ratio DTY LX : 300 pull-up to 5V, Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT LX : 300 pull-up to 5V. Duty ratio 75%. Maximum Oscillation Frequency MAX FOSC Measuring of LX waveform. No external components. Apply output voltage x 0.95 to VOUT LX Limit Voltage VLxLMT Apply voltage to Lx. Voltage required to produce FOSC x 2. Efficiency (Note3) EFFI External components connected e Measuring conditions: Unless otherwise specified, VIN=VOUT 0.6, IOUT=4mA. 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 consumption. 3. {[Output Voltage] x [Output Current] / [(Input Voltage) x (Input Current)]} x 100. 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 L 2 1 L 5 4 VIN (TOP VIEW) SOT-23 VIN 1 VOUT (TOP VIEW) SOT-25 e SD CL 3 2 3 VOUT + SD CL + GND CE GND L: 220H (SUMIDA, CD54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93) L: 220H (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93) Fig.1 XC6385A Application Fig.2 XC6385C Application L 5 4 VIN SD 1 (TOP VIEW) SOT-25 2 3 VOUT CL + VDD GND GND L: 220H (SUMIDA, CD-54) SD: MA735 (Schottky diode; MATSUSHITA) CL: 16V 47F (Tantalum capacitor, NICHICON, F93) Fig.3 XC6385E Application s XC6385A301 Characteristics (Output Voltage = 3.0V) (1) OUTPUT VOLTAGE vs. OUTPUT CURRENT (2) EFFICIENCY vs. OUTPUT CURRENT XC6385A301 L=220H, CL=22F (Tantalum) XC6385A301 L=220H, CL=22F (Tantalum) OUTPUT VOLTAGE:VOUT (V) EFFICIENCY:EFFI (%) e OUTPUT CURRENT:IOUT (mA) OUTPUT CURRENT:IOUT (mA) (3) RIPPLE VOLTAGE vs. OUTPUT CURRENT (4) NO LOAD INPUT CURRENT vs. INPUT VOLTAGE XC6385A301 L=220H, CL=22F (Tantalum) XC6385A301 L=220H, CL=22F (Tantalum) RIPPLE VOLTAGE:Vr (mVp-p) OUTPUT CURRENT:IOUT (mA) INPUT CURRENT:IIN (A) INPUT VOLTAGE :VIN (V) < Recommended external components > L : 220H ( Sumida CD54) CL : 22F (Tantalum) SD : MA729 (Matsushita) |
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