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| 0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C FEATURES 8 SOP/ 8 DIP PIN Configulation OPERATING FROM 3V TO 40V Low Standby Current Current Limitting Output Switch Current to 0.8A Output Valtage Adjustable Operation Frequency up to 180KHz (CT=100pF) Precision 2% Reference SOP-8 PKG DIP-8 PKG Switch Collector Switch Emitter 1 2 8 7 6 5 Drive Collector Ipk Sense Vcc Comparator - Input Application Battery Chargers NICs / Switches / Hubs ADSL Modems Negative Voltage Power Supplies Timing 3 Capacitor 4 Ground ORDERING INFORMATION Device MC34063CD MC34063CN Package 8 SOP 8 DIP DESCRIPTION The MC34063C is a monolithic switching regulator control circuit containing the primary funtion required for DC-DC converters. This device consists of internal temperature compenssated reference, voltage comparator, cotr duty cycle oscillator with active current. The device is specifically designed to be used in StepStep-Up and Voltage-Inverting applications with a minimum number of external components. The MC34063C is the enhanced version of MC34063A with the ability to work in higher frequen The 34063C is available in 2 pcakages : SOP-8 and DIP-8. Jan. 2007-Rev 1.0 HTC 1 0.8A Step Down / Step Up / Inverting DC-DC Converter BLOCK DIAGRAM MC34063C Drive Collector 8 s Q Q2 Q1 R 1 Switch Collector Ipk Sense 7 2 Ipk Oscillator Switch Emitter 3 Timing Capacitor Vcc 6 Comparator + Comparator lnverting input 1.25V Reference Regulator 4 GND 5 ABSOLUTE MAXIMUM RATINGS (NOTE 1) SYMBOL Vcc Vir VSWC VSWE VCE Vdc Idc Isw PD PJA PD PJA TJ Tstg Power Supply Voltage Comparator input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VSWC=40V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (NOTE 2) Switch Current SOP Package Power Dissipation at Tamb=25 Thermal Resistance DIP Package Power Dissipation at Tamb=25 Thermal Resistance Operating Juntion Temperature Range Storage Temperature Range PARAMETER VALUE 40 -0.3 to 40 40 40 40 40 100 0.8 1.25 100 0.625 160 -40 to 150 -65 to +150 UNIT V V V V V V A W /W W /W Absolute Maximum Rating are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Jan. 2007-Rev 1.0 HTC 2 0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta= -40 to 85 OSCILLATOR SYMBOL FOSC Ichg Idischg Idischg/Ichg Vipk(sense) PARAMETER Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage TEST CONDITIONS Vpin5= 0 V ,CT= 100pF ,Ta= 25o VCC= 5 to 40V ,Ta= 25oC o VCC= 5 to 40V ,Ta= 25 C o Pin 7= VCC ,Ta= 25 C o Ichg= Idischg ,Ta= 25 C MIN. 170 30 180 5.2 250 TYP. 180 38 240 6.5 300 MAX. UNIT 190 KHz 45 290 7.5 350 OUTPUT SWITCH (NOTE 3) SYMBOL VCE(sat) VCE(sat) hFE IC(off) PARAMETER Saturation Voltage, Darlington connection Saturation Voltage (NOTE 4) DC Current Gain Collector Off-State Current TEST CONDITIONS ISW= 1A ,Pins 1,8 connected ISW= 1A ,Rpin8= 82 to VCC, Forced ~ 20 o ISW= 1A, VCE= 5V, Ta= 25 C VCE= 40V MIN. TYP. 1 0.45 50 75 0.01 MAX. UNIT 1.3 V 0.8 V 100 COMPARATOR SYMBOL Vth Regline IIB PARAMETER Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TEST CONDITIONS Ta= 25oC Ta= TLOW to THIGH VCC= 3 to 40V VIN= 0V MIN. 1.225 1.21 TYP. 1.25 1.4 -20 MAX. UNIT 1.275 V V 1.29 5 -400 TOTAL DEVICE SYMBOL ICC PARAMETER Supply Current TEST CONDITIONS MIN. VCC= 5 to 40V, CT=1 Pin7= VCC ,Vpin5>Vth, Pin2=GND Remaining pins open for MC34063C TYP. 2.5 MAX. UNIT 4 Notes: 1 Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the devic These are stress retings only, and functional operation of the device at these or any other conditions beyond thos indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" f extended periods may affect device reliability. 2 Maximum package power dissipation limits must be observed. 3 Low duty cycle pulse technique are used during test to maintain juntion temperature as close to ambient Temperature as possible. 4 If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (300mA) and high driver currents ( 30mA), it may take up to 2.0 for it to come out of saturation. This condition will shorten the off time at frequencies 30kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. Jan. 2007-Rev 1.0 HTC 3 0.8A Step Down / Step Up / Inverting DC-DC Converter TYPICAL PERFORMANCE CHARACTERISTICS MC34063C Jan. 2007-Rev 1.0 HTC 4 0.8A Step Down / Step Up / Inverting DC-DC Converter TYPICAL APPLICATION CIRCUIT Step-Up Converter L1 120H MC34063C R3 180 8 1 DRC 7 SWC 2 Ipk Rsc 0.4 SWE TC GND 3 D1 IN5819 6 Vcc 5 VIN 12V C2 100 + CII 4 C3 1500pF VOUT 28V/175 MC34063C R1 R2 47K 2.2K + C1 330 Step-Down Converter 8 1 DRC Rsc 0.4 SWC 2 IN5819 7 Ipk 6 SWE TC GND 3 D1 Vcc 5 VIN 25V C2 100 + CII 4 L C3 470 220H MC34063C R1 R2 3.6K 1.2K + C1 470 VOUT 5V/0.5A Jan. 2007-Rev 1.0 HTC 5 0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C Step-Up With External NPN Switch 8 1 S Q VOUT + Q2 Q1 R 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 Voltage Inverting Converter 8 1 DRC R3 0.4 SWC 2 7 L1 150H Ipk 6 SWE 3 Vcc 5 TC 4 D1 C3 1.5 BYV10-40 VIN 4.5V to 6V C2 100 + CII GND MC34063C R2 R1 VOUT 953 8.2K C1 + 1000 -12V /100 Jan. 2007-Rev 1.0 HTC 6 0.8A Step Down / Step Up / Inverting DC-DC Converter Step-Down With External NPN Switch MC34063C 8 1 S Q Q2 Q1 R 2 7 Rsc 6 Ipk Oscillator 3 VOUT + VIN comparator + 5 1.25V Reference Regulator 4 Step-Down With External PNP Switch 8 1 S Q Q2 Q1 R + 2 7 VOUT Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 Jan. 2007-Rev 1.0 HTC 7 0.8A Step Down / Step Up / Inverting DC-DC Converter Voltage Inverting With External NPN Switch MC34063C 8 1 S Q Q2 Q1 R 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 VOUT + + 5 1.25V Reference Regulator 4 Voltage Inverting With External PNP Saturated Switch 8 1 S Q Q2 Q1 R VOUT + 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 Jan. 2007-Rev 1.0 HTC 8 0.8A Step Down / Step Up / Inverting DC-DC Converter Dual Output Voltage MC34063C + +12V GND 8 1 + S Q Q2 Q1 -12V R 2 7 Rsc VIN 6 Ipk Oscillator 3 comparator 1.25V + 5 Reference Regulator 4 Higher Output Power, Higher Input Voltage + Isolated from input +VOUT -VOUT 8 1 S Q + R 2 7 VIN Rsc 6 comparator 1.25V Ipk Oscillator 3 + - Reference Regulator 4 5 Jan. 2007-Rev 1.0 HTC 9 |
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