MC34063ABD-TR

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. 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 designed for step-down, step-up and voltageinverting applications. Table 1. Device summary Order codes DIP-8 MC34063ABN (1) MC34063ACN (1) SO-8 MC34063ABD-TR MC34063ACD-TR MC34063EBD-TR MC34063ECD-TR MC34063EBN MC34063ECN 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 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Diagram 1 Figure 1. Diagram Block diagram 3/23 Pin configuration MC34063AB - MC34063AC - MC34063EB - MC34063EC 2 Figure 2. Pin configuration Pin connections Table 2. Pin n° 1 2 3 4 5 6 7 8 Pin description Symbol SWC SWE TC GND CII VCC IPK DRC Switch collector Switch emitter Timing capacitor Ground Comparator inverting input Voltage supply IPK sense Voltage driver collector Name and function 4/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Maximum ratings 3 Table 3. Symbol VCC VIR VSWC VSWE VCE VDC IDC ISW PTOT TJ TSTG Maximum ratings Absolute maximum ratings Parameter Power supply voltage Comparator input voltage range Switch collector voltage Switch emitter voltage (VSWC = 40V) Switch collector to emitter voltage Driver collector voltage Driver collector current Switch current for DIP-8 Power dissipation at TA = 25°C Operating junction temperature Storage temperature range for AC and EC series TOP Operating ambient temperature range for AB series for EB series for SO-8 Value 50 -0.3 to 40 40 40 40 40 100 1.5 1.25 W 0.625 150 -40 to 150 0 to 70 -40 to 85 -40 to 125 °C °C °C Unit V V V V V V mA A Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data Parameter Thermal resistance junction-ambient (1) Thermal resistance junction-case DIP-8 100 42 SO-8 160 20 Unit °C/W °C/W Table 4. Symbol RthJA RthJC 1. This value depends from thermal design of PCB on which the device is mounted. 5/23 Electrical characteristics MC34063AB - MC34063AC - MC34063EB - MC34063EC 4 Electrical characteristics (Refer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified, see Note 2) Table 5. Symbol fOSC ICHG IDISCHG IDISCHG/ICHG VIPK(sense) Oscillator Parameter Frequency Charge current Discharge current Discharge to charge current ratio Test conditions VPIN5 = 0V, CT = 1 nF, TA = 25°C VCC = 5 to 40V, TA = 25°C VCC = 5 to 40V, TA = 25°C PIN 7 = VCC, TA = 25°C Min. 24 24 140 5.2 250 Typ. 33 33 200 6.2 300 Max. 42 42 260 7.5 350 Unit kHz µA µA µA mV Current limit sense voltage ICHG = IDISCHG, TA = 25°C Table 6. Symbol VCE(sat) VCE(sat) hFE IC(off) Output switch Parameter Saturation voltage, darlington connection Saturation voltage DC current gain Collector off-state current Test conditions ISW = 1 A, PIN 7, 8 connected ISW = 1 A, RPIN8 = 82 Ω to VCC Forced β ~ 20 ISW = 1 A,VCE = 5 V, TA = 25°C VCE = 40 V 50 Min. Typ. 1 0.45 120 0.01 100 µA Max. 1.3 0.7 Unit V V Table 7. Symbol VTH Regline IIB Comparator Parameter Threshold voltage Threshold voltage line regulation Input bias current Test conditions TA = 25°C TA = TLOW to THIGH VCC = 3 to 40 V VIN = 0 V Min. 1.225 1.21 1 -5 Typ. 1.25 Max. 1.275 V 1.29 5 -400 mV nA Unit 6/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Electrical characteristics Table 8. Symbol Total device Parameter Test conditions VCC = 5 to 40 V CT = 1 nF PIN 7 = VCC VPIN5 >VTH PIN 2 = GND Remaining pins open for MC34063A Min. Typ. 2.5 Max. 4 Unit ICC Supply current mA for MC34063E 1.5 4 VSTART-UP Start-up voltage (Note 4) for MC34063A TA = 25°C CT = 1 µF, PIN 5 = 0 for MC34063E 2.1 V 1.5 Note: 1 2 3 Maximum package power dissipation limit must be observed. 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). 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 current switch = ICOUTPUT/(ICDRIVER - 1 mA(a)) ≥ 10 Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work. 4 a. Current less due to a built in 1 kΩ anti leakage resistor. 7/23 Typical performance characteristics MC34063AB - MC34063AC - MC34063EB - MC34063EC 5 Figure 3. Typical performance characteristics 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 Figure 7. Power collector emitter saturation voltage (VCEsat) vs temperature Figure 8. Typical performance characteristics 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 MC34063AB - MC34063AC - MC34063EB - MC34063EC 6 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 VIN = 8 to 16 V, IO = 175 mA VIN = 12 V, IO = 75 to 175 mA VIN = 12 V, IO = 175 mA VIN = 12 V, IO = 175 mA Value (Typ.) 30 10 300 89 Unit mV mV mV % Line Regulation Load Regulation Output Ripple Efficiency 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 VIN = 15 to 25 V, IO = 500 mA VIN = 25 V, IO = 50 to 500 mA VIN = 25 V, IO = 500 mA VIN = 25 V, IO = 500 mA VIN = 25 V, RLOAD = 0.1 Ω Value (typ.) 5 30 100 80 1.2 Unit mV mV mV % A Line regulation Load regulation Output ripple Efficiency ISC 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 VIN = 4.5 to 6 V, IO = 100 mA VIN = 5 V, IO = 10 to 100 mA VIN = 5 V, IO = 100 mA VIN = 5 V, IO = 100 mA VIN = 5 V, RLOAD = 0.1 Ω Value (typ.) 15 20 230 58 0.9 Unit mV mV mV % A Line regulation Load regulation Output ripple Efficiency ISC 12/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit Table 12. Calculation Step-Up (Discontinuous mode) O UT + V F – V IN ( m i -----------------------------------------------V IN ( min ) – V sat Parameter Step-Down (Continuous mode) V OUT + V F --------------------------------------------------N ( min ) – V sat – V O U 1/fmin 4.5x10-5t Voltage Inverting (Discontinuous mode) V OUT + V F -----------------------------V IN – V sat 1/fmin 4.5x10-5ton 2Iout(max)[(ton/toff)+1] 0.3/IPK(switch) I out t on -----------------------------V ripple ( p – p ) V IN ( min ) – V sat ----------------------------------- × t on ( m i I PK ( switch ) ton/toff (ton + toff) max CT IPK(switch) RSC CO 1/fmin 4.5x10-5t on on 2Iout(max)[(ton/toff)+1] 0.3/IPK(switch) I out t on -----------------------------V ripple ( p – p ) V IN ( min ) – V sat ----------------------------------- × t on ( m i I PK ( switch ) 2Iout(max) 0.3/IPK(switch) I PK ( switch ) ( t on + t off ) ----------------------------------------------------8V ripple ( p – p ) N ( min ) L(min) – V sat – V out ------------------------------------------------ × t on ( I PK ( switch ) Note: 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 Figure 25. Higher output power, higher input voltage Typical application circuit 17/23 Package mechanical data MC34063AB - MC34063AC - MC34063EB - MC34063EC 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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. Dim. Min. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3. 3 1.6 0.017 8. 8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9 .8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 Typ. 3. 3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 Max. Min. Typ. 0.130 Max. inch. P001F 19/23 Package mechanical data MC34063AB - MC34063AC - MC34063EB - MC34063EC SO-8 mechanical data Dim. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. Min. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8° (max.) 0.04 0.228 0.010 0.016 Typ. Max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch. Typ. Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0016023/C 20/23 MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data Tape & reel SO-8 mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 Min. Typ. Max. 12.992 0.519 inch. 21/23 Revision history MC34063AB - MC34063AC - MC34063EB - MC34063EC 8 Table 13. Date Revision history Document revision history Revision 9 10 Added Table 1. Changes 22-Jun-2004 20-Nov-2007 22/23 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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