MC34063AB - MC34063AC MC34063EB - MC34063EC DC/DC converter control circuits Features Output switch current in excess of 1.5 A 2 % reference accuracy Low quiescent current: 2.5 mA (typ.) Operating from 3 V to 40 V Frequency operation to 100 kHz Active current limiting DIP-8 SO-8 Description The MC34063A/E series is a monolithic control circuit delivering the main functions for DC/DC voltage converting. designed for step-down, step-up and voltageinverting applications. 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/E devices series is Table 1. Device summary Order codes DIP-8 SO-8 MC34063ABN (1) MC34063ABD-TR (1) MC34063ACD-TR MC34063ACN MC34063EBN MC34063EBD-TR MC34063ECN MC34063ECD-TR 1. The "A" version is not recommended for new designs. November 2007 Rev 10 1/23 www.st.com 23 Contents MC34063AB - MC34063AC - MC34063EB - MC34063EC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC 1 Diagram Figure 1. Block diagram Diagram 3/23 Pin configuration MC34063AB - MC34063AC - MC34063EB - MC34063EC 2 Pin configuration Figure 2. Pin connections Table 2. Pin description Pin n Symbol 1 SWC Switch collector 2 SWE Switch emitter 3 TC 4 GND 5 CII Comparator inverting input 6 VCC Voltage supply 7 IPK IPK sense 8 DRC 4/23 Name and function Timing capacitor Ground Voltage driver collector MC34063AB - MC34063AC - MC34063EB - MC34063EC 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Maximum ratings Parameter VCC Power supply voltage VIR Comparator input voltage range Value Unit 50 V -0.3 to 40 V VSWC Switch collector voltage 40 V VSWE Switch emitter voltage (VSWC = 40V) 40 V VCE Switch collector to emitter voltage 40 V VDC Driver collector voltage 40 V IDC Driver collector current 100 mA ISW Switch current 1.5 A PTOT Power dissipation at TA = 25C TJ Operating junction temperature TSTG for DIP-8 1.25 for SO-8 0.625 W Storage temperature range for AC and EC series TOP 150 C -40 to 150 C 0 to 70 Operating ambient temperature range for AB series -40 to 85 for EB series -40 to 125 C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4. Thermal data Symbol Parameter DIP-8 SO-8 Unit RthJA Thermal resistance junction-ambient (1) 100 160 C/W RthJC Thermal resistance junction-case 42 20 C/W 1. This value depends from thermal design of PCB on which the device is mounted. 5/23 Electrical characteristics 4 MC34063AB - MC34063AC - MC34063EB - MC34063EC Electrical characteristics (Refer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified, see Note 2) Table 5. Oscillator Symbol Parameter Test conditions Min. Typ. Max. Unit fOSC Frequency VPIN5 = 0V, CT = 1 nF, TA = 25C 24 33 42 kHz ICHG Charge current VCC = 5 to 40V, TA = 25C 24 33 42 A Discharge current VCC = 5 to 40V, TA = 25C 140 200 260 A Discharge to charge current ratio PIN 7 = VCC, TA = 25C 5.2 6.2 7.5 A 250 300 350 mV Min. Typ. Max. Unit IDISCHG IDISCHG/ICHG VIPK(sense) Table 6. Current limit sense voltage ICHG = IDISCHG, TA = 25C Output switch Symbol Parameter VCE(sat) Saturation voltage, darlington connection ISW = 1 A, PIN 7, 8 connected 1 1.3 V VCE(sat) Saturation voltage ISW = 1 A, RPIN8 = 82 to VCC Forced ~ 20 0.45 0.7 V DC current gain ISW = 1 A,VCE = 5 V, TA = 25C Collector off-state current VCE = 40 V 0.01 100 A Min. Typ. Max. Unit TA = 25C 1.225 1.25 1.275 TA = TLOW to THIGH 1.21 hFE IC(off) Table 7. Symbol VTH Regline IIB 6/23 Test conditions 50 120 Comparator Parameter Threshold voltage Test conditions V 1.29 Threshold voltage line regulation VCC = 3 to 40 V 1 5 mV Input bias current VIN = 0 V -5 -400 nA MC34063AB - MC34063AC - MC34063EB - MC34063EC Table 8. Total device Symbol ICC Parameter Supply current VSTART-UP Start-up voltage (Note 4) Note: Electrical characteristics Test conditions Typ. Max. for MC34063A 2.5 4 for MC34063E 1.5 4 for MC34063A TA = 25C CT = 1 F, PIN 5 = 0 for MC34063E 2.1 VCC = 5 to 40 V CT = 1 nF PIN 7 = VCC VPIN5 >VTH PIN 2 = GND Remaining pins open Min. Unit mA V 1.5 1 Maximum package power dissipation limit must be observed. 2 TLOW = 0 C, THIGH = 70 C (AC and EC series); TLOW = -40 C, THIGH = 85 C (AB series); TLOW = -40 C, THIGH = 125 C (EB series). 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 of output current switch = ICOUTPUT/(ICDRIVER - 1 mA(a)) 10 4 Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work. a. Current less due to a built in 1 k anti leakage resistor. 7/23 Typical performance characteristics MC34063AB - MC34063AC - MC34063EB - MC34063EC 5 Typical performance characteristics Figure 3. Emitter follower configuration Figure 4. output saturation voltage vs emitter current Output switch ON-OFF time vs oscillator timing capacitor Figure 5. Common emitter configuration Figure 6. output switch saturation voltage vs collector current Darlington configuration collector emitter saturation voltage (VCEsat) vs temperature 8/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical performance characteristics Figure 7. Power collector emitter saturation voltage (VCEsat) vs temperature Figure 8. Current limit sense voltage (VIPK) vs temperature Figure 9. Reference voltage vs temperature Figure 10. Bias current vs temperature Figure 11. Supply current vs temperature Figure 12. Supply current vs input voltage 9/23 Typical application circuit 6 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit Figure 13. Step-up converter Figure 14. Printed evaluation board PIN 1 = VOUT PIN 2 = GND PIN 3 = GND PIN 4 = VIN Table 9. Test condition (VOUT = 28 V) Test Conditions Value (Typ.) Unit Line Regulation VIN = 8 to 16 V, IO = 175 mA 30 mV Load Regulation VIN = 12 V, IO = 75 to 175 mA 10 mV Output Ripple VIN = 12 V, IO = 175 mA 300 mV Efficiency VIN = 12 V, IO = 175 mA 89 % 10/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit Figure 15. Step-down converter Figure 16. Printed evaluation board PIN 1 = VOUT PIN 2 = GND PIN 3 = GND PIN 4 = VIN Table 10. Test condition (VOUT = 5 V) Test Conditions Value (typ.) Unit Line regulation VIN = 15 to 25 V, IO = 500 mA 5 mV Load regulation VIN = 25 V, IO = 50 to 500 mA 30 mV Output ripple VIN = 25 V, IO = 500 mA 100 mV Efficiency VIN = 25 V, IO = 500 mA 80 % ISC VIN = 25 V, RLOAD = 0.1 1.2 A 11/23 Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC Figure 17. Voltage inverting converter Figure 18. Printed evaluation board PIN 1 = VOUT PIN 2 = GND PIN 3 = GND PIN 4 = VIN Table 11. Test condition (VOUT = 12 V) Test Conditions Value (typ.) Unit Line regulation VIN = 4.5 to 6 V, IO = 100 mA 15 mV Load regulation VIN = 5 V, IO = 10 to 100 mA 20 mV Output ripple VIN = 5 V, IO = 100 mA 230 mV Efficiency VIN = 5 V, IO = 100 mA 58 % ISC VIN = 5 V, RLOAD = 0.1 0.9 A 12/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Table 12. Calculation Parameter ton/toff (ton + toff) max CT IPK(switch) Typical application circuit Step-Up (Discontinuous mode) Step-Down (Continuous mode) OUT + V F - V IN ( mi -----------------------------------------------V IN ( min ) - V sat V OUT + V F --------------------------------------------------N ( min ) - V sat - V OU 1/fmin 1/fmin 4.5x10-5t 4.5x10-5t on Voltage Inverting (Discontinuous mode) V OUT + V F -----------------------------V IN - V sat 1/fmin on 4.5x10-5ton 2Iout(max)[(ton/toff)+1] 2Iout(max) 2Iout(max)[(ton/toff)+1] RSC 0.3/IPK(switch) 0.3/IPK(switch) 0.3/IPK(switch) CO I out t on -----------------------------V ripple ( p - p ) I PK ( switch ) ( t on + t off ) -----------------------------------------------------8V ripple ( p - p ) I out t on -----------------------------V ripple ( p - p ) L(min) Note: V IN ( min ) - V sat ----------------------------------- x t on ( mi I PK ( switch ) - V sat - V out ------------------------------------------------ x t on( I PK ( switch ) N ( min ) V IN ( min ) - V sat ----------------------------------- x t on ( mi I PK ( switch ) 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, |VOUT| = 1.25 (1 + R2/R1) IOUT = Desired output current fMIN = Minimum desired output switching frequency at the selected values of VIN and IO VRIPPLE = Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will and 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. 13/23 Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC Figure 19. Step-up with external NPN switch Figure 20. Step-down with external NPN switch 14/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit Figure 21. Step-down with external PNP switch Figure 22. Voltage inverting with external NPN switch 15/23 Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC Figure 23. Voltage inverting with external PNP saturated switch Figure 24. Dual output voltage 16/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit Figure 25. Higher output power, higher input voltage 17/23 Package mechanical data 7 MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 18/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data Plastic DIP-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 3.3 Typ. Max. 0.130 a1 0.7 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b b1 0.028 0.5 0.38 0.020 0.5 D 0.015 0.020 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L Z 3.3 0.44 0.130 1.6 0.017 0.063 P001F 19/23 Package mechanical data MC34063AB - MC34063AC - MC34063EB - MC34063EC SO-8 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8 (max.) 0.1 0.04 0016023/C 20/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 21/23 Revision history MC34063AB - MC34063AC - MC34063EB - MC34063EC 8 Revision history Table 13. Document revision history Date Revision 22-Jun-2004 9 20-Nov-2007 10 22/23 Changes Added Table 1. MC34063AB - MC34063AC - MC34063EB - MC34063EC Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. 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