ET- MC34063 DC to DC Converter Controller Description Features The MC34063 is a monolithic switching ¾ Operation from 3.0V to 40V regulator the ¾ Low Standby Current. DC-DC ¾ Current Limiting converters. This devices consists of internal ¾ Output Switch Current to 1.2A temperature reference, ¾ Output Voltage Adjustable voltage comparator, controlled duty cycle ¾ Operation Frequency up to 180KHz primary control functions circuit containing required compensated for oscillator with active current limit circuit, (CT=100pF) driver and high current output switch. The device is incorporated specifically in voltage-inverting designed to step-down,step-up applications ¾ Precision 2% Reference Applications be and with a minimum number of external components. Block Diagram ¾ Battery Chargers ¾ ADSL Modems ¾ NICs/Switches/Hubs ¾ Negative Voltage Power Supplies www.estek.com.cn 1 Pin Description Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Ordering Information Part Number Operating Temperature Range MC34063KI Packing SOP-8 Tape & Reel DIP-8 Tube -40 oC ~ +85 oC MC34063JI Package Absolute Maximum Ratings(NOTE1) Symbol Parameter VCC Power Supply Voltage VIR Comparator Input Voltage Range Value Unit 40 V -0.3 ~ +40 V VC(switch) Switch Collector Voltage 40 V VE(switch) Switch Emitter Voltage (VPIN1=40V) 40 V VCE(switch) Switch Collector to Emitter Voltage 40 V VC(driver) Driver Collector Voltage 40 V IC(driver) Driver Collector Current (NOTE2) 100 mA Switch Current 1.2 ISW TJ Operating Junction Temperature Range TA Operating Ambient Temperature Range Tstg Storage Temperature Range ESD A +150 o C -40 ~ +85 o C -65 ~ +150 o C 2000 V Notes: 1 Stresses greater than those listed under .Absolute Maximum Ratings. may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under .Recommended Operating Conditions. is not implied. Exposure to .Absolute Maximum Ratings. for extended periods may affect device reliability. 2 Maximum package power dissipation limits must be observed. Thermal Characteristics Symbol Parameter Thermal Resistance From Junction to Ambient in Free θJA Air. (Measured with the component mounted on a high effective thermal conductivity test board in free air.) www.estek.com.cn 2 Package Typical Value SOP-8 160 Unit o DIP-8 C/W 100 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 (Ta=25 °C, VCC=5.0V, unless otherwise noted .) Electrical Characteristics Symbol Parameter Test Condition Min. Typ. Max. Unit Oscillator Fosc Frequency Vpin5=0V, CT=1.0nF 30 38 45 KHz Ichg Charge Current VCC=5.0V to 40V 30 38 45 uA Discharge Current VCC=5.0V to 40V 180 240 290 uA Pin 7 to VCC 5.2 6.5 7.5 - Icha=Idischa 250 300 350 mV - 1.0 1.3 V - 0.45 0.8 V 50 75 - - 0.01 100 uA Idischg Idischg/Ichg Vipk(sence) Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch (NOTE3) VCE(sat) VCE(sat) hFE IC(off) Saturation Voltage, ISW=1.0A, Darlington Connection Pins 1,8 connected Saturation Voltage, ISW=1.0A, Rpin8=82Ω to (NOTE4) VCC, Forcedβ=20 DC Current Gain ISW=1.0A, VCE=5.0V Collector Off-State Current VCE=40V - TA=25 °C 1.225 TA=-40 °C to +85 °C 1.21 Comparator Vth Regline IIB Threshold Voltage Threshold Voltage Line Regulator Input Bias Current 1.25 1.275 1.29 V VCC=3.0V to 40V - 1.4 5.0 mV Vin=0V - -20 -400 nA - - 4.0 mA Total Device VCC=5.0V to 40V, ICC Supply Current CT=1.0nF, Pin 7=VCC Vpin 5>Vth, pin2=GND Remaining pins open Notes: 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close 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 2.0μs for it to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended: Forced β of output switch: IC(OUTPUT) IC(DRIVER)-7.0mA* ≥10 * The 100Ω resistor in the emitter of the driver device requires about 7 mA before the output switch conducts. www.estek.com.cn 3 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Typical Characteristics www.estek.com.cn 4 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Typical Application Circuits www.estek.com.cn 5 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Typical Application Circuits www.estek.com.cn (Continued) 6 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Typical Application Circuits www.estek.com.cn (Continued) 7 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Design Formula Table Vsat : Saturation voltage of the output switch. VF : Forward Voltage drop of the output rectifier. The following power supply characteristics must be chosen. Vin : Nominal input voltage. Vout : Desired output voltage. Iout : Desired output current. Fmin : Minimum desired output switch frequency at the selected values of Vin an Io. Vripple(pp) : Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. www.estek.com.cn 8 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Package Information SOP-8 www.estek.com.cn 9 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011 ET- MC34063 Package Information DIP-8 www.estek.com.cn 10 Copyright @ Estek Electronics Co., Ltd Version 0.3 27 Sep 2011