MC34063A

MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-00 ! FEATURES " " " " " " ! DESCRIPTION The MC34063A by Analog Integrations Corporation, an improved second source over the industrial standard MC34063A, is a monolithic control circuit containing the primary functions required reference, for DC/DC converters. controlled The duty device cycle consists of an internal temperature compensated comparator, oscillator with an active current limit circuit, driver and high current output switch. This device is specifically designed to be incorporated in stepdown, step-up and voltage-inverting applications with a minimum number of external components. The ±1.8% internal reference and low quiescent current of 1.6mA are among the improvements of the device over the competition. 3V to 30V Input Voltage Operation. Internal 1.6A Peak Current Switch. Internal ±1.8% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to 100KHz. Current Limiting. ! APPLICATIONS " " Saver for Cellular phones DC-DC Converter Module ! TYPICAL APPLICATION CIRCUIT 200µH L CO 220µF D1 1N5819 8 VOUT + DRI IPK VCC FB SC SE TC GND 1 2 3 4 *RS VIN + C1 100µF 7 6 5 8.6V SAVER *:Io=0.3/RS 470pF RB RA 5.6K 33K CT MC34063A Saver Circuit for Cellular Phone ! ORDERING INFORMATION MC34063A XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE C: 0°C~+70°C ORDER NUMBER MC34063ACN (PLASTIC DIP) MC34063ACS (PLASTIC SO) PIN CONFIGURATION TOP VIEW SC 1 SE 2 TC 3 GND 4 8 DRI 7 IPK 6 VCC 5 FB ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 1 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-00 ! ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................…………..................................... 30V ..................................………….................... -0.3V~30V Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage .......................................……………......................................30V ..................................…………….............................................30V .....................…………..........................................30V Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current .................................……………............................................30V ............................................……………..............................................1.6A Power Dissipation and Thermal Characteristics DIP Package Ta= 25°C ...............................………….............................1.0W .................……….......................100°C /W Thermal Resistance SO Package Ta= 25°C .................................…………….......................625mW Thermal Resistance .................……….......................160°C /W Operating Junction Temperature ................................…………..….............................125°C Operating Ambient Temperature Range .................……...…...............................0°C~70°C Storage Temperature Range .....................……………....…........................... - 65°C~150°C ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 2 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-00 ! ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25°C, unless otherwise specified.) PARAMETER Oscillator Charging Current Discharge Current Voltage Swing Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Darlington Connection Saturation Voltage ISW =1.0A; VC(DRIVER)=VC(SWITCH) ISW =1.0A; IC(DRIVER)=50mA (Forced β≅20) ISW =1.0A; VCE=5.0V VCE=30V VCE(SAT) 1.0 1.3 V 5.0V≤VCC≤30V 5.0V≤VCC≤30V PIN 3 VIPK(SENSE) =VCC ICHG IDISCHG VOSC IDISCHG/ ICHG 10 100 25 150 0.6 6.0 40 200 µA µA V TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT ICHG=IDISCHG VIPK(SENSE) 250 300 350 mV VCE (SAT) 0.4 0.7 V DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Supply current hFE IC(OFF) 35 120 10 nA 0°C≤Ta≤70°C VFB 1.227 1.21 1.25 1.273 1.29 V V mV/V 3.0V≤VCC≤30V REGLINE 0.1 0.3 VIN=0V VIPK(SENSE)=VCC VPIN 5>VFB 5.0V≤VCC≤30V CT=0.001µF, PIN 2=GND Remaining pins open IIB ICC 0.4 1.6 1 3 µA mA ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 3 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-00 ! TYPICAL tON-OFF Output Switch ON-OFF Time (µS) 1000 PERFORMANCE CHARACTERISTICS Standby Supply Current vs. Supply Voltage 2 Output Switch ON-OFF Time vs. Oscillator Timing Capacitor ICC, Supply Current (mA) VCC=5V VIPK=VCC PIN
5=GND ON TIME 1.6 1.2 CT=1nF VIPK=VCC PIN 2=GND 100 0.8 10 OFF TIME 0.4 1 0.1 1 10 100 0 0 5 10 15 20 25 30 CT, Oscillator Timing Capacitor (nF) VCC, Supply Voltage (V) VFB, Threshold Voltage vs Temperature 1.3 IPK Threshold Voltage vs Temperature 350 VIPK, Threshold Voltage (mV) VFB, Threshold Voltage (V) 1.28 VCC = 5V, CT = 1nF PIN 2 = GND 340 330 320 310 300 290 280 270 260 VCC = 5V CT = 1nF PIN 5 = GND 1.26 1.24 1.22 1.2 250 0 10 20 30 Temperature (°C) 40 50 60 70 80 0 10 20 30 40 50 60 70 80 Temperature (°C) Emmiter-Follower Configuration Output Switch Saturation Voltage vs Emmiter Current 1.8 Common-Emitter Configuration Output Switch Saturation Voltage vs Collector Current 1.4 VCE(SATE) Saturation Voltage (V) 1.7 VCE(SAT), Saturation Voltage (V) VCC = 5V PIN 1, 7, 8 = VCC PIN 3, 5 = GND 1.2 1.0 0.8 0.6 0.4 VCC = 5.0V VCC = 5V PIN 7 =VCC PIN 7 = VCC PINS 2, 3, 5 = GND PIN 2, 3, 5 = GND Forced Beta = 20 Darlington Connection 1.6 1.5 1.4 Forced Beta = 20 0.2 0 1.3 1.2 0 0.5 1 1.5 0 0.5 1 1.5 IE, Emitter Current (A) IC, Collector Current (A) ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 4 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-00 ! BLOCK DIAGRAM SC 1 Q2 Q1 80 SE 2 7 IPK QS R 8 DRI CT 3 IS Oscillator TC 6 Comparator 1.25V Reference Voltage + VCC - GND 4 5 FB ! PIN DESCRIPTIONS PIN 1: SC PIN 2: SE PIN 3: TC - 1.6A switch collector - Darlington switch emitter - Oscillator timing capacitor PIN 5: FB - Feedback comparator inverting input PIN 6: VCC - Power supply input PIN 7: IPK PIN 8: DRI - Highside current sense input, VCC - VIPK=300mV - Drive collector PIN 4: GND - Power GND ! APPLICATION INFORMATION • DESIGN FORMULA TABLE CALCULATION t ON t OFF (tON + tOFF) MAX CT IC (SWITCH) RS L(MIN) Co
STEP-DOWN VOUT + VF VIN(MIN) - VSAT - VOUT 1 FMIN 4x10-5tON 2IOUT(MAX) 0.33/IC(SWITCH) VIN(MIN) - VSAT - VOUT  tON(MAX) IC(SWITCH) IC ( SWITCH) (t ON + t OFF) 8V RIPPLE ( P - P )
STEP-UP VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 FMIN 4 x 10-5tON 2IOUT(MAX) ( t ON + t OFF ) t OFF VOLTAGE-INVERTING VOUT + VF VIN - VSAT 1 FMIN 4 x 10-5tON 2IOUT(MAX) ( t ON + t OFF ) t OFF 0.33/ IC (SWITCH) VIN(MIN) - VSAT  tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P)
0.33/ IC (SWITCH) VIN(MIN) - VSAT  tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 5 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-P2 VSAT VF = Saturation voltage of the output switch. = Forward voltage drop of the ringback rectifier FMIN - Minimum desired output switching frequency at the selected values for VIN and IOUT. The following power supply characteristics must be chosen: VIN VOUT - Nominal input voltage. - Desired output voltage, V OUT =1.25 (1 + RB/RA) VRIPPLE (P-P)- Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. IOUT - Desired output current. ! APPLICATION EXAMPLES 200µ H L + 8 RS 0.25 VIN 7 6 + 5 100µ F DRI IPK VCC FB CS 1 SE TC 4 GND MC34063A 470pF CT RA 1.2K RB 3.6K 2 3 D1 1N5821 CO 470µ F VOUT 5V/500mA C1 Line Regulation Load Regulation Short Circuit Current VIN = 10V ~20V @ IO=500mA VIN = 15V, @ IO=10mA ~ 500mA VIN =15V, @ RL = 0.1Ω Fig. 1 Step-Down Converter 40mV 5mV 1.3A R1 8 DRI RS VIN + C1 7 6 5 IPK VCC FB CS 1 SE TC GND 2 3 4 CT D1 L Co + VOUT R2 Q1 MC34063A RS RB Fig. 2 Step-Down Converter with External PNP Saturation Switch ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 6 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-P2 ! APPLICATION EXAMPLES (CONTINUED) 200µ H L R1 150 8 RS 0.22 VIN + 100µ F C1 DRI CS SE TC GND 1 2 3 4 CT 680pF D1 VOUT 2V/200mA + 1N5819 CO 220µ F 7 IPK 6 VCC 5 FB MC34063A RA RB 47K
Line Regulation Load Regulation 2.2K VIN = 8V ~16V @ IO=200mA VIN = 12V, @ IO=80mA ~ 200mA Fig. 3 Step-Up Converter 100mV 5mV L D1 VOUT R1 8 RS VIN + C1 RA 7 6 5 DRI IPK VCC FB CS 1 SE TC GND 2 3 R2 4 CT Q CO + MC34063A RB Fig. 4 Step-Up Converter with External NPN Switch ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 7 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-P2 ! APPLICATION EXAMPLES (CONTINUED) 1 DRI 2 L 100µ H CT 680pF VOUT -12V/100mA + D1 1N5819 3 4 IPK VCC FB 8 7 S RS 0.25 VIN 4.5V~6V CS SE TC 6 GND 5 + C1 100µ F MC34063A CO 470µ F RA 953 RB 8.2K Line Regulation Load Regulation VIN = 4.5V ~6V @ IO=100mA VIN = 5V, @ IO=10mA ~ 100mA Fig.5 Inverting Converter 20mV 100mV R2 8 DRI RS VIN + C1 7 IPK 6 VCC 5 FB CS 1 SE 2 TC 3 GND 4 MC34063A L CT D1 R1 Q1 RA RB CO + VOUT Fig 6. Voltage Inverting Converter With PNP Saturated Switch ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 8 MC34063A DC/DC CONVERTER CONTROL CIRCUIT SPEC NO: DS34063A-P2 ! PHYSICAL DIMENSIONS 8 LEAD PLASTIC SO (unit: mm) D " SYMBOL A H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40 MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27 A1 B C D e A C A1 E e H L 1.27(TYP) B L " 8 LEAD PLASTIC DIP (unit: mm) D SYMBOL A1 E1 MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 — 2.92 MAX — 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81 A2 b C E D E E1 C A2 A1 L e eB 2.54 (TYP) b e eB L ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 9