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MC34063A
DESCRIPTION
DC-TO-DC Converter Control Circuits
PIN CONFIGURATION
Switch Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 7 6 5 Diver Collector IPK Sense VCC Comparator Inverting Input
The MC34063A is a monolithic control circuit containing the primary functions required for DC-to-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. MC34063A is specifically designed to be incorporated in Step-Down, Step-Up and VoltageInverting applications with a minimum number of external components.
(Top View)
FEATURES
Operation from -0.3V to 40V Input Low Standby Current Current Limiting Output Switch Current to 1.5A Output Voltage Adjustable Frequency Operation to 42kHz Precision 2% Reference
APPLICATION
DC-DC Converter
ORDERING INFORMATION
Temperature Range Package SOP8L SOP8L DIP8L Orderable Device MC34063ADG MC34063ADRG MC34063APG Package Qty 75Units/Tube 2500Units/Tape 50Units/Tube
0C to +70C
Pb-Free
1
MC34063A
SCHEMATIC DIAGRAM
8 Drive Collector
DC-TO-DC Converter Control Circuits
1 Switch Collector SQ R 7 Ipk Sense Ipk Oscillator GT 6 VCC 3 Timing Capacitor 100 Q2 Q1 2 Switch Emitter
+
Comparator
_
5 Comparator Inverting Input
1,25V Reference Regulator 4 GND
(Bottom View) Figure 1. Representative Schematic Diagram
ABSOLUTE MAXIMUM RATINGS
Parameter Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPin1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Power Dissipation, TA = 25C D Package P Package Thermal Resistance, TA = 25C D Package P Package Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW PD RJA TJ TA Tstg Value 40 -0.3 to +40 40 40 40 40 100 1.5 625 1.25 160 100 +150 0 to +70 -65 to +150
C/W C C C
Unit V
V
V V
V V mA A mW W
Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range
2
MC34063A
ELECTRICAL CHARACTERISTICS
Parameter OSCILLATOR Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage fosc Ichg Idischg Idischg/Ichg Vlpk(sense) Symbol
DC-TO-DC Converter Control Circuits
(Vcc = 5.0V, TA=0 to +70C, unless otherwise specified) Test Conditions Min Typ Max Unit 33 33 42 42 kHz A A
VPin5=0V,CT=1.0nF,TA= 25C 24 VCC = 5.0V to 40V, TA = 25C 24 VCC = 5.0V to 40V, TA = 25C 140 Pin7 to VCC, TA=25C Ichg = Idischg, TA = 25C 5.2 250
200 260 6.2 7.5
300 350
mV
OUTPUT SWITCH (Note 3) Saturation Voltage, VCE(sat) Darlington Connection Saturation Voltage,
Darlinton Connection
ISW = 1.0A, Pins 1, 8 connected ISW = 1.0A, Forced = 20 RPin 8 = 82 to VCC ISW = 1.0A, VCE =5.0V, TA = 25C VCE = 40V
1.0
1.3
V V
VCE(sat) hFE IC(off)
0.45 0.7 50 75 40 100
DC Current Gain Collector Off-State Current COMPARATOR Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TOTAL DEVICE Supply Current
A
Vth Regline IIB
TA = 25C TA = Tlow to Thigh VCC = 3.0V to 40V Vin = 0V VCC = 5.0V to 40V, CT = 10nF, Vpin7 = VCC, VPin5 > Vth, Pin 2 = GND, Remaining pins open
1.225 1.25 1.275 1.21 1.4 1.29 5.0
V mV nA
-20 -400
ICC
2.5
4.0
mA
NOTE 1: Maximum package power dissipation limits must be observed
NOTE 2: Low duty cycle pulse techniques are used during test to maintain juction temperature as close to ambient temperature as possible
3
MC34063A
Assembly Information:
DC-TO-DC Converter Control Circuits
CHIP APPEARANCE
CHIP SIZE CHIP THICKNESS
1
8
7
BONDING PAD DIMENSION
1a 1b 2a 2b 3 4 5 6 7 8 SCRIBE LINE WIDTH TOP METAL BACK METAL WAFER SIZE
SWITCH COLLECTOR SWITCH EMITTER TIMING CAPACITOR GROUND
COMPARATOR INVERTING INPUT
1,18 x 1,27 mm 460 20 m 90 x 90 m 90 x 90 m 90 x 90 m 90 x 90 m 90 x 90 m 90 x 90 m 90 x 90 m 90 x 90 m 96 m Al - 100 mm
2
3
4
5
6
Vcc Ipk SENCE DRIVER COLLECTOR
4
MC34063A
ton-off.OUTPUT SWITCH ON-OFF TIME(S)
1000 500 200 100 50 20 10 5.0 2.0 1.0
DC-TO-DC Converter Control Circuits TYPICAL PERFORMANCE CHARACTERISTICS
VCC=5.0V Pin7=VCC Pin5=GND TA=25C ton
VOSC,OSOCILLATOR VOLTAGE(V)
200 mV / DIV VCC=5.0V Pins1,5,8=Open Pin7=VCC CT=1.0F Pin2=GND TA=25C 10S / DIV
1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VCC=5.0V Pin7=Vcc
Pins 2,3,5=GND
toff
0.01 0.02 0.05 0.1 0.2 0.5
1.0 2.0
5.0
10
CT,OSCILLATOR TIMING CAPACITOR(nF) Figure 3. Timing Capacitor Waveform
Figure 2. Output Switch On-Off Time vs. Oscillator Timing Capacitor
1.8
VCE(sat),SATURATION VOTAGE(V)
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 VCC=5.0V Pins1,7,8=Vcc Pins3,5=GND TA = 25C
VCE(sat),SATURATION VOTAGE(V)
Darlington Connection
TA = 25C Forced = 20
IE, EMITTER CURRENT(A) Figure 4. Emitter Follower Configuration Output Saturation Voltage vs. Emitter Current
IC, COLLECTOR CURRENT(A) Figure 5. Common Emitter Configuration Output Switch Saturation Voltage vs. Collector Current
400
3.6 Vcc=5.0V Ichg=Idischg
VIPK(sense),CURRENT LIMIT
ICC,SUPPLY CURRENT(mA)
380 360
3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0 5.0 10 15 20 25 30 35 40 CT=1.0nF Pin7=Vcc Pin2=GND
SENSE VOLTAGE(V)
340 320 300 280 260 240 220 200 -55 -25 0 25 50 75 100 125
TA,AMBIENT TEMPERATURE(C) Figure 6. Current Limit Sense Voltage vs. Temperature
VCC,S UPPLY VOLTAGE(V) Figure 7. Standby Supply Current vs. Supply Voltage
5
MC34063A
TYPICAL APPLICATION
DC-TO-DC Converter Control Circuits
L1 170H
R3 180
8
1 DRC SWC 2 SWE 3 D1 BYV10-40
7
Ipk
RSG 0.22 VIN 12V C2 100F +
6
VCC
TC
5
CII
GND
4
VOUT C3 1.5nF
R1 2.2k
R2 47k C3 330F +
Figure 8. Step-Up Converter
For VOUT=28V Parameter Line Regulation Load Regulation Output Ripple Efficiency 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 Result(Typ) 30 10 300 89 Unit
mV mV mV %
6
MC34063A
DC-TO-DC Converter Control Circuits TYPICAL APPLICATION(CONTINUED)
8
1 DRC SWC BYV10-40 2 Ipk SWE D1 3
7 RSC 0.33 6
VCC
TC
5 Vin C2 100F +
CII
GND
4
L1 220H C3 470pF
R2 1.2k
R1 3.6k C1 470F +
Figure 9. Step-Down Converter
For VOUT = 5V Parameter Line Regulation Load Regulation Output Ripple Efficiency ISC Test Conditions VIN = 15 to 25 V, IO = 500 mA VIN = 25 V, IO = 50 to 500mA VIN = 25 V, IO = 500 mA VIN = 25 V, IO = 500mA VIN = 25 V, Rload = 0.1 Result(Typ) 5 30 100 80 1.2 Unit
mV mV mV % A
7
MC34063A
DC-TO-DC Converter Control Circuits TYPICAL APPLICATION(CONTINUED)
8
1 DRC SWC L1 2 Ipk SWE 90H 3 TC
7 RSC 0.22 6
VCC
VIN 4.5 to 6V C2 100F +
5
CII
GND
4 D1 BYV10-40
C3 1.5nF
R2 8.2k
R1 953k C1 1000F +
VOUT -12V / 100mA
Figure 10. Voltage Inverting Converter
For VOUT = -12V Patameter Line Regulation Load Regulation Output Ripple Efficiency ISC Test Conditions VIN = 4.5 to 6 V, IO = 100 mA VIN = 5 V, IO = 10 to 100mA VIN = 5 V, IO = 100 mA VIN = 5 V, IO = 100mA VIN = 5 V, Rload = 0.1 Result(Typ) 15 20 230 58 0.9 Unit
mV mV mV % A
8
MC34063A
DC-TO-DC Converter Control Circuits TYPICAL APPLICATION(CONTINUED)
8 1 SQ R Q2 + Q1 VOUT
2 7 RSC Ipk Oscillator
3
VIN
6
+
Comparator
1.25V Reference Regulator
4
_
5
Figure 11. Step-up with External NPN Switch
8 1 SQ R Q2 Q1
2 7 RSC Ipk Oscillator
3 VOUT
VIN
6
+
Comparator
1.25V Reference Regulator
+ 4
_
5
Figure 12. Step-down with External NPN Switch
9
MC34063A
DC-TO-DC Converter Control Circuits TYPICAL APPLICATION(CONTINUED)
8 1 SQ R Q2 Q1
VOUT 2 7 RSC Ipk Oscillator +
3
VIN
6
+
Comparator
1.25V Reference Regulator
4
_
5
Figure 13. Step-down with External PNP Switch
8 1 SQ R Q2 Q1
2 7 RSC Ipk Oscillator
3 VOUT
VIN
6
+
Comparator
1.25V Reference Regulator
4
_
5
+
Figure 14. Voltage Inverting with External NPN Switch
10
MC34063A
DC-TO-DC Converter Control Circuits TYPICAL APPLICATION(CONTINUED)
8 1 SQ R Q2 Q1 VOUT
2 7 Ipk Oscillator
+
RSC VIN 6
3
+
Comparator
1.25V Reference Regulator
4
_
5
Figure 15. Voltage Inverting with External PNP Saturated Switch
+12V +
GND + 8 1 SQ R Q2 Q1
-12V
2 7 RSC Ipk Oscillator
3
VIN
6
+
Comparator
1.25V Reference Regulator
4
_
5
Figure 16. Dual Output Voltage
11
MC34063A
DC-TO-DC Converter Control Circuits
TYPICAL APPLICATION(CONTINUED)
+ +VOUT Isolated from input
-VOUT + 8 1 SQ R Q2 Q1
2 VIN 7
RSC 6
Ipk Oscillator
3
+
Comparator
1.25V Reference Regulator
4
_
5
Figure 17. Higher Output Power, Higher Input Voltage
12
MC34063A
CALCULATION
DC-TO-DC Converter Control Circuits
Table 1 Design Formula Table
Calculation
Step-Up Vout + VF - Vin(min) Vin(min) - Vsat
Step-Down Vout + VF Vin(min) - Vsat - Vout
Voltage-Inverting |Vout | + VF Vin - Vsat
ton/toff (ton+toff)max toff ton CT Ipk(switch) RSC L(min) CO
1 f
ton + toff ton/toff + 1 (ton + toff) - toff 4.0x10 -5 ton ton 2Iout(max) toff + 1
1 f
ton + toff ton/toff + 1 (ton + toff) - toff 4.0x10 -5 ton 2Iout(max)
1 f
ton + toff ton/toff + 1 (ton + toff) - toff 4.0x10 -5 ton ton 2Iout(max) toff + 1
(
)
(
)
0.3 IPK(switch)
(Vin(min) - Vsat) ton(max) Ipk(switch) Ioutton Vripple(p-p)
0.3 IPK(switch)
(Vin(min) - Vsat - Vout) ton(max) Ipk(switch) Ipk(switch)(ton + toff) 8Vripple(p-p)
0.3 IPK(switch)
(Vin(min) - Vsat) ton(max) Ipk(switch) Ioutton Vripple(p-p)
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(pp)=Desired peak-to-peak output ripple voltage.In prictice,the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple should be kept to a low value since it will directiy affect the line and load regulation.
13
MC34063A
PHYSICAL DIMENSIONS SOP8L
A3 A1 A2
DC-TO-DC Converter Control Circuits
1 4
B1
R2
B
2
A
3
R1
B2
C1
C2
C
C3
D1 D
Symbol
A A1 A2 A3 B B1 B2 C C1 C2
Dimension(mm) Max Min
4.95 0.37 5.15 0.47 1.27(TYP) 0.41(TYP) 5.80 6.20 4.00 3.80 5.0(TYP) 1.30 0.55 0.55 1.50 0.65 0.65
Symbol
C3 C4 D D1 R1 R2 1 2 3 4
Dimension(mm) Min Max
0.20 0.20(TYP) 1.05(TYP) 0.40 0.60 0.07(TYP) 0.07(TYP) 17 (TYP) 13 (TYP) 4 (TYP) 12 (TYP) 0.05
14
C4
MC34063A
DIP8L
A
DC-TO-DC Converter Control Circuits
D2
1
2
B
3
D1
D
C
C2 C3
C1
A5 A3 A1 A4 A2
C4
Symbol A A1 A2 A3 A4 A5 B C C1
Dimension(mm) Min 9.30 Max 9.50 0.53 2.54(TYP) 0.66(TYP) 0.99(TYP) 6.3 6.5 7.20(TYP) 3.30 3.50
Symbol C2 C3 C4 D D1 D2 1 2 3
Dimension(mm) Min Max 0.5(TYP) 3.3(TYP) 1.57(TYP) 8.20 0.20 7.62 8.80 0.35 7.87 8 (TYP) 8 (TYP) 5 (TYP)
1.524(TYP) 0.39
15

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