MC34063ACS

MC34063A Industrial Standard, Universal DC/DC Converter n FEATURES l l l l l l n 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 for DC/DC converters. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle 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. n APPLICATIONS l l Saver for Cellular phones DC-DC Converter Module n 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 7 6 5 100µF 470pF 8.6V SAVER *:Io=0.3/RS RB RA 5.6K 33K CT MC34063A Saver Circuit for Cellular Phone n ORDERING INFORMATION MC34063A CX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE 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 Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-34063A-01 012102 1 MC34063A n 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 2 MC34063A n 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 DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TA=25°C 0°C≤TA≤70°C 3.0V≤VCC≤30V VIN=0V VIPK(SENSE)=VCC VPIN 5>VFB 5.0V≤VCC≤30V CT=0.001µF, PIN 2=GND Remaining pins open REGLINE IIB VFB 1.227 1.21 0.1 0.4 1.25 1.273 V 1.29 0.3 1 mV/V µA 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) hFE IC(OFF) 35 0.4 120 10 0.7 V nA Supply current ICC 1.6 3 mA 3 MC34063A n TYPICAL PERFORMANCE CHARACTERISTICS tON-OFF Output Switch ON-OFF Time 2 1000 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) Fig. 1 Output Switch ON-OFF Time vs. Oscillator Timing Capacitor VCC, Supply Voltage (V) Fig. 2 Standby Supply Current vs. Supply Voltage 1.3 350 VFB, Threshold Voltage (V) 1.28 VCC = 5V CT=1nF Pin 2= GND VIPK, Threshold Voltage (mV) 340 330 320 310 300 290 280 270 260 250 0 VCC = 5V CT=1nF Pin 5= GND 1.26 1.24 1.22 1.2 0 10 20 30 40 50 60 70 80 10 20 Fig. 3 Temperature (°C) VFB, Threshold Voltage vs. Temperature Temperature (°C) 30 40 50 60 70 80 Fig. 4 IPK Threshold Voltage vs. Temperature VCE(SAT) Saturation Voltage (V) VCE(SAT) Saturation Voltage (V) 1.8 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1.7 1.6 VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND Darlington Connection 1.5 1.4 1.3 Forced Beta = 20 0.5 1 1.5 1.2 0 0.5 1 1.5 0 IE, Emitter Current (A) Fig. 5 Emmiter-Follower Configuration Output Switch Saturation Voltage vs. Emmiter Current IC, Collector Current (A) Fig. 6 Common-Emitter Configuration Output Switch Saturation Voltage vs. Collector Current 4 MC34063A n 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 5 FB GND 4 n PIN DESCRIPTIONS PIN 1: SC PIN 2: SE PIN 3: TC - The switch collector is 1.6A. - 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 5 MC34063A n APPLICATION INFORMATION • DESIGN FORMULA TABLE CALCULATION tON tOFF (tON + tOFF) MAX CT IC (SWITCH) RS L(MIN) STEP-DOWN VOUT + VF VIN(MIN) - VSAT - VOUT STEP-UP VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 FMIN 4 x 10 tON 2IOUT(MAX) ( -5 VOLTAGE-INVERTING VOUT + VF VIN - VSAT 1 FMIN 4x10 tON 2IOUT(MAX) 0.33/IC(SWITCH) -5 1 FMIN 4 x 10 tON 2IOUT(MAX) ( -5 t ON + t OFF ) t OFF t ON + t OFF ) t OFF 0.33/ IC (SWITCH) 0.33/ IC (SWITCH) ( VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH) ( VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) ( VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) Co IC ( SWITCH) ( t ON + t OFF ) 8V RIPPLE (P - P ) VSAT - Saturation voltage of the output switch. VF - Forward voltage drop of the ringback rectifier The following power supply characteristics must be chosen: VIN - Nominal input voltage. VOUT - Desired output voltage, V OUT =1.25 (1 + RB/RA) IOUT - Desired output current. FMIN - Minimum desired output switching frequency at the selected values for VIN and IOUT. 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. 6 MC34063A n APPLICATION EXAMPLES 200µH L + 8 RS 0.25 VIN 10~20V C1 + 100µF 7 6 5 DRI IPK VCC FB SC 1 SE TC GND MC34063A 4 470pF CT RA 1K2 RB 3K6 2 3 D1 1N5821 CO 470µF VOUT 5V/500mA 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 1K 8 DRI VIN 10~22V + C1 100µF RA 1K2 RS 0.22 7 6 5 IPK VCC FB SC 1 SE TC GND 2 3 4 CT 470pF D1 1N5821 R2 470 Q1 200 µH L + Co 470µF VOUT 5V/500mA MC34063A RB 3K6 Fig. 2 Step-Down Converter with External PNP Saturation Switch 7 MC34063A n APPLICATION EXAMPLES (Continued) 200µH L R1 100 8 RS 0.22 VIN 8~16V + 100µF C1 DRI SC SE TC GND MC34063A RB 47K 1 2 3 4 CT 100pF GS SS14 CO 220µF + D1 VOUT 28V/200mA 7 IPK 6 VCC 5 FB RA 2.2K Line Regulation Load Regulation 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 SC 1 SE TC GND 2 3 R2 4 CT Q1 CO + MC34063A RB Fig. 4 Step-Up Converter with External NPN Switch 8 MC34063A n APPLICATION EXAMPLES (Continued) 1 SC 2 L 100µH CT 680pF VOUT D1 1N5819 3 4 SE TC GND MC34063A 8 7 S RS 0.25 VIN 4.5V~6V DRI IPK VCC 6 FB 5 + C1 100µF -12V/100mA + CO 470 µF 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 SC 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 9 MC34063A n PHYSICAL DIMENSIONS 8 LEAD PLASTIC SO (unit: mm) D l 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 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 10