MC34063A Industrial Standard, Universal DC/DC Converter n DESCRIPTION n FEATURES l l l l l l 3V to 30V Input Voltage Operation. Internal 1.6A Peak Current Switch. The l by Analog Integrations Corporation, an improved second source over the Internal ±1.8% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to 100KHz. Current Limiting. 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 n APPLICATIONS l MC34063A oscillator with an active current limit circuit, driver Saver for Cellular phones DC-DC Converter Module 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. n TYPICAL APPLICATION CIRCUIT VOUT 200µH D1 1N5819 *RS VIN 6 5 + C1 7 DRI SC IPK SE VCC TC CO 1 2 FB GND 100µF 3 4 CT 470pF 8 + 220µF L 8.6V SAVER *:Io=0.3/RS RB MC34063A RA 5.6K 33K Saver Circuit for Cellular Phone n ORDERING INFORMATION MC34063A CX ORDER NUMBER PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE MC34063ACN (PLASTIC DIP) MC34063ACS (PLASTIC SO) Analog Integrations Corporation PIN CONFIGURATION TOP VIEW SC 1 7 IPK TC 3 6 VCC GND 4 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 8 DRI SE 2 www.analog.com.tw 5 FB DS-34063A-01 012102 1 MC34063A n ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................… … … … ..................................... 30V Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage ..................................… … … … .................... -0.3V~30V .......................................… … … … … ......................................30V ..................................… … … … … .............................................30V Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current .....................… … … … ..........................................30V .................................… … … … … ............................................30V ............................................… … … … … ..............................................1.6A Power Dissipation and Thermal Characteristics DIP Package TA= 25°C ...............................… … … … .............................1.0W Thermal Resistance .................… … … .......................100°C /W 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 TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT Oscillator Charging Current 5.0V≤VCC≤30V ICHG 10 25 40 µA Discharge Current 5.0V≤VCC≤30V IDISCHG 100 150 200 µA Voltage Swing PIN 3 Discharge to Charge Current Ratio VIPK(SENSE) =VCC Current Limit Sense Voltage ICHG=IDISCHG VOSC 0.6 IDISCHG/ ICHG 6.0 VIPK(SENSE) 250 V 300 350 mV Output Switch Saturation Voltage, Darlington Connection ISW =1.0A; VC(DRIVER)=VC(SWITCH) VCE(SAT) 1.0 1.3 V Saturation Voltage ISW =1.0A; IC(DRIVER)=50mA (Forced β≅20) VCE (SAT) 0.4 0.7 V DC Current Gain ISW =1.0A; VCE=5.0V Collector Off-State Current VCE=30V IC(OFF) Threshold Voltage TA=25°C VFB Threshold Voltage 0°C≤TA≤70°C Threshold Voltage Line Regulation 3.0V≤VCC≤30V Input Bias Current Supply current hFE 35 120 10 nA Comparator 1.227 1.25 1.273 V 1.21 1.29 REGLINE 0.1 0.3 mV/V VIN=0V IIB 0.4 1 µA VIPK(SENSE)=VCC VPIN 5>VFB 5.0V≤VCC≤30V CT=0.001µF, PIN 2=GND Remaining pins open ICC 1.6 3 mA 3 MC34063A 1000 2 ICC, Supply Current (mA) VCC=5V VIPK=VCC PIN 5=GND 100 ON TIME 10 OFF TIME 1 0.1 10 0.4 0 0 VIPK, Threshold Voltage (mV) 1.24 1.22 10 Fig. 3 20 30 40 50 60 70 80 VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND 1.6 1.5 1.4 1.3 1.2 340 15 25 20 30 VCC = 5V CT=1nF Pin 5= GND 330 320 310 300 290 280 270 260 250 0 10 20 30 40 50 60 70 80 Temperature (°C) Temperature (°C) VFB, Threshold Voltage vs. Temperature 1.8 1.7 10 350 VCC = 5V CT=1nF Pin 2= GND 1.26 1.2 0 5 VCC, Supply Voltage (V) Fig. 2 Standby Supply Current vs. Supply Voltage Fig. 4 IPK Threshold Voltage vs. Temperature VCE(SAT) Saturation Voltage (V) VFB, Threshold Voltage (V) 0.8 CT, Oscillator Timing Capacitor (nF) Fig. 1 Output Switch ON-OFF Time vs. Oscillator Timing Capacitor 1.28 CT=1nF VIPK= VCC PIN 2=GND 1.2 100 1.3 VCE(SAT) Saturation Voltage (V) 1.6 1 tON-OFF Output Switch ON-OFF Time n TYPICAL PERFORMANCE CHARACTERISTICS 1.4 1.2 VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND 1.0 Darlington Connection 0.8 0.6 0.4 0.2 Forced Beta = 20 0 0 0.5 1 1.5 IE, Emitter Current (A) Fig. 5 Emmiter-Follower Configuration Output Switch Saturation Voltage vs. Emmiter Current 0 0.5 1 1.5 IC, Collector Current (A) Fig. 6 Common-Emitter Configuration Output Switch Saturation Voltage vs. Collector Current 4 MC34063A n BLOCK DIAGRAM 1 SC 8 Q2 DRI QS Q1 R 80 2 SE 7 IPK IS CT Oscillator TC 6 3 VCC Comparator 1.25V Reference Voltage GND + 5 4 FB n PIN DESCRIPTIONS PIN 1: SC - The switch collector is 1.6A. PIN 5: FB PIN 2: SE - Darlington switch emitter PIN 6: VCC - Power supply input PIN 3: TC - Oscillator timing capacitor PIN 7: IPK - Highside current sense input, VCC - VIPK=300mV PIN 8: DRI - Drive collector PIN 4: GND - Power GND - Feedback comparator inverting input 5 MC34063A n APPLICATION INFORMATION • DESIGN FORMULA TABLE CALCULATION tON tOFF STEP-DOWN STEP-UP VOLTAGE-INVERTING VOUT + VF VIN(MIN) - VSAT - VOUT VOUT + VF - VIN(MIN) VIN(MIN) - VSAT VOUT + VF VIN - VSAT 1 1 1 FMIN FMIN FMIN (tON + tOFF) MAX -5 CT 4x10 tON IC (SWITCH) 2IOUT(MAX) RS ( VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH) 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 2IOUT(MAX) ( 0.33/IC(SWITCH) L(MIN) Co -5 - Desired output current. -5 4 x 10 tON t ON + t OFF ) t OFF 4 x 10 tON 2IOUT(MAX) ( 0.33/ IC (SWITCH) ( VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) t ON + t OFF ) t OFF 0.33/ IC (SWITCH) ( VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P) 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 VOUT 200µH L 5V/500mA + 8 RS 0.25 7 6 VIN 10~20V C1 5 + DRI SC 1 IPK SE VCC TC D1 1N5821 CO 470µF 2 3 FB 4 GND RB 470pF CT 100µF 3K6 RA 1K2 MC34063A Line Regulation VIN = 10V ~20V @ IO=500mA 40mV Load Regulation VIN = 15V, @ IO=10mA ~ 500mA 5mV Short Circuit Current VIN =15V, @ RL = 0.1Ω 1.3A Fig. 1 Step-Down Converter R1 1K SC 1 8 DRI RS 0.22 VIN 7 6 10~22V 5 + C1 100µF IPK SE VCC TC GND FB 2 R2 Q1 470 200µH 3 VOUT 5V/500mA L + 4 CT 470pF D1 1N5821 Co 470µF MC34063A RA RB 1K2 3K6 Fig. 2 Step-Down Converter with External PNP Saturation Switch 7 MC34063A n APPLICATION EXAMPLES (Continued) D1 200µH VOUT L 8 RS 0.22 VIN 8~16V 28V/200mA GS SS14 R1 100 + 100µF C1 DRI SC 7 IPK SE 6 VCC TC 5 FB GND CO 220µF 1 + 2 3 4 100pF CT MC34063A RB RA 47K 2.2K Line Regulation VIN = 8V ~16V @ IO=200mA 100mV Load Regulation VIN = 12V, @ IO=80mA ~ 200mA 5mV Fig. 3 Step-Up Converter D1 L VOUT R1 8 7 RS VIN 6 + 5 C1 RA DRI SC 1 IPK SE VCC TC FB GND + CO 2 Q1 3 R2 4 CT MC34063A RB Fig. 4 Step-Up Converter with External NPN Switch 8 MC34063A n APPLICATION EXAMPLES (Continued) 1 2 L 100µH 3 4 CT 680pF D1 1N5819 VOUT SC DRI SE IPK 8 7 S RS 0.25 VCC 6 TC + FB 5 GND C1 100µF VIN 4.5V~6V MC34063A -12V/100mA + RA 953 CO 470µF RB 8.2K Line Regulation VIN = 4.5V ~6V @ IO=100mA 20mV Load Regulation VIN = 5V, @ IO=10mA ~ 100mA 100mV Fig.5 Inverting Converter R2 RS VIN + 8 DRI SC 1 7 IPK SE 2 6 VCC TC 3 GND 4 5 FB C1 R1 Q1 L D1 CT MC34063A RA RB VOUT CO + Fig 6. Voltage Inverting Converter with PNP Saturated Switch 9 MC34063A n PHYSICAL DIMENSIONS l 8 LEAD PLASTIC SO (unit: mm) D SYMBOL MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 H E e e A A1 C B l L 1.27(TYP) H 5.80 6.20 L 0.40 1.27 8 LEAD PLASTIC DIP (unit: mm) D E1 E A2 A1 MAX A1 0.381 — A2 2.92 4.96 b 0.35 0.56 C 0.20 0.36 D 9.01 10.16 E 7.62 8.26 E1 6.09 7.12 e eB e MIN C L b SYMBOL 2.54 (TYP) eB — 10.92 L 2.92 3.81 10