Step Down / Step Up / Inverting DC-DC Converter MC34063C FEATURES z z z z z z z z z SOP-8 PKG Operating from 3V to 40V Low Standby Current Current Limiting Output Switch Current to 1.2A Output Voltage Adjustable Operation Frequency up to 180kHz (CT=100pF) Precision 2% Reference Available in SOP-8 and DIP-8 Packages Moisture Sensitivity Level 3 for SMD Package DIP-8 PKG APPLICATION z z z z ORDERING INFORMATION Device Battery Chargers NICs / Switches / Hubs ADSL Modems Negative Voltage Power Supplies Package MC34063CD SOP-8 MC34063CN DIP-8 DESCRIPTION The 34063C is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. The device is specifically designed to be used in Step-Down, Step-Up and Voltage-Inverting applications with a minimum number of external components. The MC34063C is the enhanced version of MC34063A/B with the ability to work in higher frequency. Absolute Maximum Ratings (Note 1) CHARACTERISTIC SYMBOL MIN. MAX. UNIT Power Supply Voltage VCC - 40 V Comparator Input Voltage Range VIR -0.3 40 V Switch Collector Voltage VSWC - 40 V Switch Emitter Voltage (VSWC=40V) VSWE - 40 V Switch Collector to Emitter Voltage VCE - 40 V Driver Collector Voltage Vdc - 40 V Idc - 100 mA ISW - 1.2 A Driver Collector Current (Note 2) Switch Current Apr. 2011 - Rev.1.2 -1 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C Absolute Maximum Ratings (Continued) CHARACTERISTIC Power Dissipation (at TA = 25°C) Thermal Resistance SYMBOL MIN. MAX. UNIT SOP-8 PDMAX_SOP-8 1.250 W DIP-8 PDMAX_DIP-8 0.625 W SOP-8 θJA-SOP-8 100 °C/W DIP-8 θJA-DIP-8 160 °C/W Operating Junction Temperature Range Storage Temperature Range TJ -40 150 °C TSTG -65 150 °C Note 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL MIN. MAX. UNIT Supply Voltage VCC 3 40 V Operating Ambient Temperature TA -40 85 °C Ordering Information Package Order No. Description Supplied As Status SOP-8 MC34063CD 1.2A, 180kHz Reel Active DIP-8 MC34063CN 1.2A, 180kHz Tube Active MC 34063 Package Type D : SOP-8 N : DIP-8 Switch Current : C : 1.2A Root Name Product Code Apr. 2011 - Rev.1.2 -2 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C PIN CONFIGURATION 8 1 8 2 7 2 7 3 6 3 6 5 4 5 1 4 SOP-8 DIP-8 PIN DESCRIPTION SOP-8 / DIP-8 PKG Pin No. Name Function 1 Switch Collector Internal switch transistor collector 2 Switch Emitter Internal switch transistor emitter 3 Timing Capacitor Timing Capacitor to control the switching frequency 4 GND Ground pin for all internal circuits 5 Comparator Inverting Input Inverting input pin for internal comparator 6 VCC Voltage supply 7 IPK Sense 8 Driver Collector Peak Current Sense Input by monitoring the voltage drop across an external I sense resistor to limit the peak current through the switch Voltage driver collector BLOCK DIAGRAM Driver Collector 8 1 Switch Collector 2 Switch Emitter IPK Oscillator 3 Timing Capacitor 1.25V Reference Regulator 4 GND S Q R IPK Sense VCC Comparator Inverting Input Apr. 2011 - Rev.1.2 Q2 Q1 7 6 Comparator + 5 -3 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C ELECTRICAL CHARACTERISTICS VCC = 5V, TA = -40°C to 85°C, unless otherwise specified. SYMBOL PARAMETER Test Conditions MIN. TYP. MAX. UNIT OSCILLATOR FOSC Frequency Vpin5= 0V ,CT= 100pF ,TA = 25°C 170 180 190 kHz ICHG Charge Current VCC = 5 to 40V, TA = 25°C 30 38 45 uA Discharge Current VCC = 5 to 40V, TA = 25°C 180 240 290 uA IDISCHG/ICHG Discharge to Charge Current Ratio Pin 7 = VCC, TA = 25°C 5.2 6.5 7.5 VIPK(SENSE) Current Limit Sense Voltage ICHG = IDISCHG, TA = 25°C 250 300 350 mV IDISCHG Output Switch (Note 3) VCE(SAT) Saturation Voltage, Darlington connection ISW = 1A , Pins 1,8 connected 1 1.3 V VCE(SAT) Saturation Voltage (Note 4) ISW = 1A, Rpin8 = 82Ω to VCC, Forced β ~ 20 0.45 0.8 V DC Current Gain ISW = 1A, VCE= 5V, TA = 25°C Collector Off-state Current VCE = 40V 0.01 100 uA 1.25 1.275 V 1.29 V hFE IC(OFF) 50 75 Comparator VTH REGLine IIB Threshold Voltage TA = 25°C 1.225 TA = TLOW to THIGH 1.21 Threshold Voltage Line Regulation VCC = 3 to 40V 1.4 5 mV Input Bias Current VIN =0V -20 -400 nA Supply Current VCC = 5 to 40V, CT = 1nF, Pin7 = VCC. Vpin5 > VTH, Pin2 = GND, Other pins open - 4 mA TOTAL DEVICE ICC - Note 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. Note 2. Maximum package power dissipation limits must be observed. Note 3. Low duty cycle pulse technique are used during test to maintain junction temperature as close to ambient temperature as possible. Note 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 2.0us 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 : Ι C(OUTPUT) Ι C(DRIVER) - 7.0mΑ * ≥10 * The 100Ω resistor in the emitter of the driver device requires about 7 mA before the output switch conducts. Apr. 2011 - Rev.1.2 -4 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C TYPICAL OPERATING CHARACTERISTICS OUTPUT SWITCH ON-OFF TIME vs. OSCILLATOR TIMING CAPACITOR TIMING CAPACITOR WAVEFORM OSCILLATOR FREQUENCY vs. TIMING CAPACITOR STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE EMITTER FOLLOWER CONFIGURATION OUTPUT SATURATION VOLTAGE vs. EMITTER CURRENT Apr. 2011 - Rev.1.2 COMMON EMITTER CONFIGURATION OUTPUT SWITCH SATURATION VOLTAGE vs. COLLECTOR CURRENT -5 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C CURRENT LIMIT SENSE VOLTAGE vs. TEMPERATURE Apr. 2011 - Rev.1.2 -6 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C TYPICAL APPLICATION Step-Up Converter L1 120uH R3 180Ω 8 7 RSC 0.4Ω 6 5 VIN + C2 100uF 12V R1 2.2kΩ DRC SWC IPK SWE VCC CII TC GND 1 2 D1 IN5819 3 4 VOUT C3 1500pF 28V / 175mA + R2 47kΩ C1 330uF Step-Down Converter 8 7 RSC 0.4Ω 6 5 VIN 25V C2 100uF + R1 1.2kΩ Apr. 2011 - Rev.1.2 DRC IPK VCC CII SWC SWE TC GND 1 D1 IN5819 2 3 L1 220uH 4 C3 470pF + R2 3.6kΩ -7 - VOUT C1 470uF 5V / 0.5A HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C Step-Up with External NPN Switch 8 S Q R VOUT 1 Q2 + Q1 2 7 RSC VIN 6 IPK Oscillator 3 1.25V Reference Regulator 4 Comparator + 5 Step-Down with External PNP Switch 8 S Q 1 Q2 R Q1 VOUT 2 + 7 RSC VIN 6 IPK Oscillator 3 1.25V Reference Regulator 4 Comparator + 5 Apr. 2011 - Rev.1.2 -8 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C Voltage Inverting with External NPN Switch 8 S Q 1 Q2 R Q1 2 7 IPK Oscillator RSC VIN 6 VOUT 3 + Comparator 1.25V Reference Regulator + - 4 5 Voltage Inverting with External PNP Saturated Switch 8 S Q 1 Q2 R Q1 VOUT 2 + 7 RSC VIN 6 IPK Oscillator 3 1.25V Reference Regulator 4 Comparator + 5 Apr. 2011 - Rev.1.2 -9 - HTC Step Down / Step Up / Inverting DC-DC Converter MC34063C Dual Output Voltage +12V + GND 8 + S Q 1 Q2 R -12V Q1 2 7 RSC VIN 6 IPK Oscillator 3 1.25V Reference Regulator 4 Comparator + 5 Higher Output Power, Higher Input Voltage + + VOUT Isolated from input - VOUT 8 + S Q R 1 Q2 Q1 2 VIN 7 RSC 6 IPK Oscillator 3 1.25V Reference Regulator 4 Comparator + 5 Apr. 2011 - Rev.1.2 - 10 - HTC