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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
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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 = 25C 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 = 25C VCC = 5 to 40V, TA = 25C VCC = 5 to 40V, TA = 25C PIN 7 = VCC, TA = 25C Min. 24 24 140 5.2 250 Typ. 33 33 200 6.2 300 Max. 42 42 260 7.5 350 Unit kHz A A A mV
Current limit sense voltage ICHG = IDISCHG, TA = 25C
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 to VCC Forced ~ 20 ISW = 1 A,VCE = 5 V, TA = 25C VCE = 40 V 50 Min. Typ. 1 0.45 120 0.01 100 A 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 = 25C 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 = 25C CT = 1 F, 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 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 k 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 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 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)
OUT + V F - V IN ( mi -----------------------------------------------V IN ( min ) - V sat
Parameter
Step-Down (Continuous mode) V OUT + V F --------------------------------------------------N ( min ) - V sat - V OU 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 ----------------------------------- x t on ( mi 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 ----------------------------------- x t on ( mi 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 ------------------------------------------------ x 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(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
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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
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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
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