DC-DC Converter Control Circuits MC34063A/B FEATURES SOP-8 PKG Output Switch Current In Excess of 1.5A 2% Reference Accuracy Low Quiescent Current : 2.5mA(Typ.) Operating From 3V to 40V Frequency Operation to 100KHz Active Current Limiting Moisture Sensitivity Level 3D MC34063AG is Halogen Free Products DIP-8 PKG APPLICATION ORDERING INFORMATION Battery Chargers Device NICs / Switches / Hubs MC34063AD ADSL Modems MC34063AGD Negative Voltage Power Supplies MC34063BD Package SOP-8 MC34063AN DIP-8 DESCRIPTION The MC34063A/B series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit driver and high current output switch. Output voltage is adjustable through two external resistors with a 2% reference accuracy. Employing a minimum number of external components the MC34063A/B devices series is designed for StepDown, Step-Up and Voltage-Inverting applications. Absolute Maximum Ratings (Note 1) CHARACTERISTIC SYMBOL MIN. MAX. UNIT Power Supply Voltage VCC - 50 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 - 1.5 A Driver Collector Current (Note 2) Switch Current July 2013 - Rev. 1.1 -1 - HTC DC-DC Converter Control Circuits MC34063A/B Absolute Maximum Ratings (Continued) CHARACTERISTIC Power Dissipation (at TA = 25°C) SYMBOL MIN. MAX. UNIT SOP-8 PDMAX_SOP-8 0.625 W DIP-8 PDMAX_DIP-8 1.0 W SOP-8 θJA-SOP-8 160 °C/W DIP-8 θJA-DIP-8 100 °C/W -40 150 °C 0 75 °C -40 85 °C -65 150 °C Thermal Resistance(*) Operating Junction Temperature Range TJ MC34063A TAOPR Operating Ambient Temperature Range MC34063B Storage Temperature Range TSTG Note 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. (*) This value depends from thermal design of PCB on which the device is mounted. Ordering Information Operating Ambient Temperature(TAOPR) Range Package 0℃~70℃ 0℃~70℃ SOP8 -40℃~85℃ 0℃~70℃ Order No. Supplied As Status MC34063AD Reel Active MC34063AGD Reel Contact us MC34063BD Reel Active MC34063AN Tube Active MC34063BN Tube Active DIP8 -40℃~85℃ MC 34063 Package Type D : SOP8 N : DIP8 G : Halogen Free Blank : Pb Free Green Mode Temperature Range A : 0℃~70℃ B : -40℃~85℃ Root Name Product Code July 2013 - Rev. 1.1 -2 - HTC DC-DC Converter Control Circuits MC34063A/B PIN CONFIGURATION 1 8 1 8 2 7 2 7 3 6 3 6 4 5 4 5 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 S 1 Switch Collector 2 Switch Emitter IPK Oscillator 3 Timing Capacitor 1.25V Reference Regulator 4 GND Q R IPK Sense VCC July 2013 - Rev. 1.1 Q1 7 6 Comparator + Comparator Inverting Input Q2 5 -3 - HTC DC-DC Converter Control Circuits MC34063A/B ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC=5V, TA=TLOW to THIGH, unless otherwise specified, see note 2) SYMBOL PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT OSCILLATOR FOSC Frequency VPIN5=0V, CT=1nF, TA=25℃ 24 33 42 KHz ICHG Charge Current VCC=5 to 40V, TA=25℃ 24 35 42 ㎂ Discharge Current VCC=5 to 40V, TA=25℃ 140 220 260 ㎂ IDISCHG/ICHG Discharge to Charge Current Ratio Pin 7= VCC, TA=25℃ 5.2 6.5 7.5 VIPK(SENSE) Current Limit Sense Voltage ICHG=IDISCHG, TA=25℃ 250 300 350 mV IDISCHG OUTPUT SWITCH VCE(SAT) Saturation Voltage, Darlington connection ISW=1A, Pins 1,8 connected 1.0 1.3 V VCE(SAT) Saturation Voltage ISW=1A, RPIN8=82Ω to VCC, Forced β ~ 20 0.45 0.7 V DC Current Gain ISW=1A, VCE=5V, TA=25℃ Collector Off-State Current VCE= 40V 0.01 100 ㎂ 1.25 1.275 V 1.29 V hFE IC(OFF) 50 75 COMPARATOR VTH REGLINE IIB TA=25℃ 1.225 TA=TLOW to THIGH 1.21 Threshold Voltage Threshold Voltage Line Regulation VCC= 3 to 40V 1 5 mV Input Bias Current VIN= 0V -5 -400 nA VCC= 5 to 40V, CT=1nF Pin7= VCC, VPIN5>VTH, Pin2=GND Remaining pins open for MC34063A/B 1.4 4 mA TOTAL DEVICE ICC Supply Current Note 1. Maximum package power dissipation limit must be observed. Note 2. TLOW= '-30℃, THIGH= '+125℃ Note 3. If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch. The resulting switch-off time may be adversely affected. In a Darlington configuration the following output driver condition is suggested: Forced β of output switch : Ι C(OUTPUT) Ι C(DRIVER) - 7.0mΑ * ≥10 * Currentless due to a built in 1KΩ anti-leakage resistor July 2013 - Rev. 1.1 -4 - HTC DC-DC Converter Control Circuits MC34063A/B TYPICAL ELECTRICAL CHARACTERISTICS Emitter Follower Configuration Output Output Switch ON-OFF Time Saturation Voltage vs. Emitter Current vs. Oscillator Timing Capacitor Common Emitter Configuration Output Switch Darlington Configuration Collector Emitter Saturation Voltage vs. Collector Current Saturation Voltage (VCE(SAT)) vs. Temperature Power Collector Emitter Saturation Current Limit Sense Voltage (VIPK) Voltage (VCE(SAT)) vs, Temperature vs. Temperature July 2013 - Rev. 1.1 -5 - HTC DC-DC Converter Control Circuits MC34063A/B TYPICAL ELECTRICAL CHARACTERISTICS (Continued) Reference Voltage vs. Temperature Bias Current vs. Temperature Supply Current vs. Temperature Supply Current vs. Input Voltage July 2013 - Rev. 1.1 -6 - HTC DC-DC Converter Control Circuits MC34063A/B TYPICAL APPLICATION CIRCUIT Step-Up Converter L1 170uH R3 180Ω 8 1 DRC SWC IPK SWE 7 RSC 0.22Ω 2 6 VCC TC 5 12V 4 CII VIN GND VOUT C3 1.5nF + C2 100uF D1 BYV10-40 3 25V / 175mA MC34063A/B R1 2.2kΩ + R2 44kΩ C1 330uF Step-Down Converter 8 1 DRC SWC 7 RSC 0.33Ω IPK SWE 6 3 VCC TC 5 25V C2 100uF July 2013 - Rev. 1.1 GND + R1 1.2kΩ L1 220uH 4 CII VIN D1 BYV10-40 2 C3 470pF + R2 3.6kΩ -7 - VOUT C1 470uF 5V / 0.5A HTC DC-DC Converter Control Circuits MC34063A/B Step-Up with External NPN Switch 8 S Q R VOUT 1 Q2 + Q1 2 7 RSC VIN IPK Oscillator 3 1.25V Reference Regulator 4 6 Comparator + 5 Voltage Inverting Converter 8 1 DRC SWC IPK SWE 7 RSC 0.22O 2 6 3 VCC TC 5 VIN 4.5V to 5V GND + R1 8.2kO July 2013 - Rev. 1.1 4 CII C2 100uF L1 90uH C3 1.5nF D1 BYV10-40 + R2 953O -8 - VOUT C1 1000uF -12V / 100mA HTC DC-DC Converter Control Circuits MC34063A/B Step-Down with External NPN Switch 8 S Q 1 Q2 R Q1 2 7 IPK Oscillator RSC VIN 3 VOUT + 6 Comparator 1.25V Reference Regulator + - 4 5 Step-Down with External PNP Switch 8 S Q 1 Q2 R Q1 VOUT + 2 7 RSC VIN IPK Oscillator 3 1.25V Reference Regulator 4 6 Comparator + 5 July 2013 - Rev. 1.1 -9 - HTC DC-DC Converter Control Circuits MC34063A/B Voltage Inverting with External NPN Switch 8 S Q 1 Q2 R Q1 2 7 IPK Oscillator RSC VIN VOUT 3 + 6 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 IPK Oscillator 3 1.25V Reference Regulator 4 6 Comparator + 5 July 2013 - Rev. 1.1 - 10 - HTC DC-DC Converter Control Circuits MC34063A/B Dual Output Voltage +12V + GND 8 + S Q 1 Q2 -12V R Q1 2 7 RSC VIN IPK Oscillator 3 1.25V Reference Regulator 4 6 Comparator + 5 Higher Output Power, Higher Input Voltage + VOUT + Isolated from input - VOUT 8 + S Q R 1 Q2 Q1 2 VIN 7 RSC IPK Oscillator 3 1.25V Reference Regulator 4 6 Comparator + 5 July 2013 - Rev. 1.1 - 11 - HTC DC-DC Converter Control Circuits MC34063A/B Design Formula Table Calculation ton/toff Step-UP Step-Down Voltage Inverting VOUT VF VIN(MIN) VOUT VF VIN(MIN) VSAT VOUT VF VIN(MIN) VSAT VIN VSAT 1 1 1 f MIN f MIN f MIN 4.0 10 5 ton 4.0 10 5 ton 4.0 10 5 ton (ton/toff)max CT 2 IOUT(MAX) IPK(SWITCH) ( t off 1) t on 0.3 / I PK(SWITCH) RSC ( L(MIN) VIN(MIN) VSAT ) t on(max) I PK(SWITCH) 9 CO I OUT t on VRIPPLE(PP) 2 IOUT(MAX) 2 IOUT(MAX) 0.3 / I PK(SWITCH) ( VIN(MIN) VSAT VOUT I PK(SWITCH) ( t off 1) t on 0.3 / I PK(SWITCH) ) t on(max) I PK(SWITCH) (t on t off ) 8VRIPPLE(PP) ( VIN(MIN) VSAT I PK(SWITCH) 9 ) t on(max) I OUT t on VRIPPLE(PP) TERMS AND DEFINITIONS 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 switching frequency at the selected values of VIN and IO. VRIPPLE(p-p) – 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. July 2013 - Rev. 1.1 - 12 - HTC