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CYStech Electronics Corp.
DC-to-DC Converter Control Circuit
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 1/7
MC34063AQ8
Description
The MC34063AQ8 is a monolithic control circuit containing the primary functions required for DC-to-DC converters. This device consists of an internal temperature compensated reference, comparator, control- led duty cycle oscillator with an active current limit circuit, driver and high current output switch.
Features
* 3V to 40V Input Voltage Operation * Internal 1.6A Peak Current Switch * Internal 1.8% Reference * Low Quiescent Current at 1.6mA * Frequency Operation from 100Hz~100KHz * Current Limiting
Applications
* Saver for Cellular Phone * DC-DC Converter Module
Typical Application Circuit
Fig1.Saver Circuit for Cellular Phone MC34063A RSC Vin
8 7 6 5 1 2 3 4
L1 200H
Vout
D1
1N5819
Cout 220F
CT 470F
C1 100F RA 5.6k
RB 33k
MC34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
Pin Connections
8 7 6 5
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 2/7
1
2
3
4
Pin1:Switch Collector Pin2:Switch Emitter Pin3:Timing Capacitor Pin4:Gnd
Pin5:Comparator Inverting Input Pin6:Vcc Pin7:Ipk Sense Pin8:Driver Collector
Absolute Maxium Rating
Supply Voltage ....................................................................................................................................... 40 V Comparator Input Voltage Range ........................................................................................... -0.3 V ~ 40 V Switch Collector Voltage ....................................................................................................................... 40 V Switch Emitter Voltage .......................................................................................................................... 40 V Switch Collector to Emitter Voltage ...................................................................................................... 40 V Driver Collector Voltage ........................................................................................................................ 40 V Switch Current ....................................................................................................................................... 1.6A Power Dissipation DIP Package Ta=25C........................................................................................ 625 mW Thermal Resistance Junction to Air............................................................................................. 160 C / W Operating Junction Temperature......................................................................................................... 125 C Operating Ambient Temperature Range......................................................................................... 0 ~ 70 C Storage Temperature Range.................................................................................................. -40 C ~ 125 C
Electrical Characteristics (Vcc=5V,Ta=25C, unless otherwise specified)
Parameter Oscillator Charging Current Discharge Current Voltage Amplitude Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Darlington Connection Saturation Voltage DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Supply Current Test Condition 5.0VVCC40V 5.0VVCC40V Pin3 VIPK(Sense) =VCC IChg=Idischg ISW=1.0A, VC(Driver)=VC(Switch) ISW=1.0A, IC(Driver)=50mA (Forced 20) ISW=1.0A, VCE=5.0V VCE=40V 0CTa70C 3.0VVCC40V VIN=0V VIPK(Sence)=VCC VPin5>VFB, 5.0VVCC40V CT=0.0001uF,Pin2=Gnd Remaining pins open Symbol Ichg Idischg VOSC IDischg/Ichg VIPK(Sence) VCE(Sat) VCE(Sat) hFE ICC(Off) VFB Regline IIB ICC Min. 24 140 5.2 250 50 Typ. 35 220 0.6 6.5 300 1.0 0.4 75 0.01 Max. 42 260 7.5 350 1.3 0.7 100 Unit uA uA V mV V V V uA V mV nA mA
1.227 1.250 1.273 1.210 1.29 1.5 6 -20 -400 1.6 3
MC34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
Block Diagram
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 3/7
SC Pin1:1.6A Switch Collector Q1
DRI Pin8:Driver Collector Q2 QS R 80 IPK Pin7:Highside Current Sense Input, VCC-VIPK=300mV VCC Pin6:Power Supply Input
SE Pin2:Darlington Switch Emitter TC Pin3:Oscilletor Timing Capacitor
CT
IPK Oscillator
1.25V Reference Voltage
Comparator + -
GND Pin4:Power GND
FB Pin5:Feedback Comparator Inverting Input
Application Information
Design Formula Table
Calculation ton / toff (ton + toff) max CT IC(switch) RS L(min) CO Step-Down Vout+VF / Vin(min) -Vsat-VOut 1/Fmin 4*10 ton 2*Iout(max) 0.3 / IC(switch)
-5
Step-Up Vout+VF-Vin(min) / Vin(min)-Vsat 1/Fmin 4*10 ton 2*Iout(max)(ton+toff/toff) 0.3 / IC(switch)
-5
Voltage-Inverting |Vout| + VF / Vin-Vsat 1/Fmin 4*10-5ton 2*Iout(max)(ton+toff/toff) 0.3 / IC(switch)
(Vin(min)-Vsat-Vout / IC(switch))
*ton(max) IC(switch)*(ton+toff) / 8VRipple(P-P)
(Vin(min)-Vsat / IC(switch))
*ton(max)
(Vin(min)-Vsat/ IC(switch))
*ton(max)
Iout*ton / VRipple(P-P)
Iout*ton / VRipple(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. |Vout|=1.25*(1+RB/RA) Iout - Desired output current 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.
MC34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
Application Information (Continued)
Fig.2 Step-Up Converter
L1 R1 150 RSC 0.22 Vin C1 100F 200H MC34063A
8 7 6 5 1 2 3 4
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 4/7
D1 1N5819 Vout 28V / 200mA Cout 220F
CT 680F
RB RA 2.2k 47k
Line Regulation : 100mV (Vin=8V~16V, @Io=200mA) Load Regulation : 5mV (Vin=12V, @Io=80mA~200mA)
Fig.3 Step-Up Converter With External NPN Switch
L1 R1 RSC Vin C1 MC34063A
8 7 6 5 1 2 3 4
Vout D1 Cout
Q1 CT R2
RB RA
Fig.4 Step-Down Converter
L1 MC34063A RSC 0.25 Vin C1 100F
8 7 6 5 1 2 3 4
200H
Vout 5V / 500mA Cout 470F
CT 470F
D1 1N5819
RB 3.6k RA 1.2k
Line Regulation : 40mV (Vin=10V~20V, @Io=500mA) Load Regulation : 5mV (Vin=15V, @Io=10mA~500mA) Short Circuit Current : 1.3A (Vin=15V, @RL=0.1)
CYStek Product Specification
MC34063AQ8
CYStech Electronics Corp.
Application Information (Continued)
Fig.5 Step-Down Converter With External PNP Saturation Switch
MC34063A R2
8 1 2 3 4
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 5/7
R1 Q1 L1 Vout Cout
RSC Vin
7 6 5
CT
D1
C1 RA
RB
Fig.6 Voltage Inverting Converter
MC34063A RSC 0.25 Vin 4.5V-6V C1 100F RB 8.2k
8 7 6 5 1 2 3 4
D1 1N5819 L1 100H CT 680F
Vout -12V / 100mA
Cout 470F
RA 953
Line Regulation : 20mV (Vin=4.5V~6V, @Io=100mA) Load Regulation : 100mV (Vin=5V, @Io=10mA~100mA)
Fig.7 Voltage Inverting Converter With External PNP Saturation Switch
MC34063A R1
8 1 2 3 4
R2 Q1
RSC Vin
7 6 5
L1 CT
D1
RA C1 RB
Vout Cout
MC34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
Characteristic Curves
Output Switch On-Off Time vs Oscillator Timing Capacitance
1000 Output Switch On-Off Time---ton-off(us Saturation Voltage---VCE(sat)(V) VCC=5.0V Pin 7=VCC Pin 5=GND TA=25 ton 10 toff 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.1 1 Oscillator Timing Capacitance---CT(nF) 10 0 0.2 0.4 0.6 0.8
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 6/7
Emitter Follower Configuration Output Saturation Voltage vs Emitter Current
100
VCC=5V Pins 1,7,8=VCC Pins 3,5=Gnd TA=25 (See Note )
1 0.01
1
1.2
1.4
1.6
Emitter Current---IE(A)
Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current 1.1 1 0.9 Darlington Connection 0.8 VCC=5V 0.7 Pin 7=VCC 0.6 Pins 2,3,5=Gnd TA=25 0.5 (See Note) 0.4 Forced =20 0.3 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Collector Current---IC(A)
Current Limit Sense Voltage vs Temperature
Current Limit Sense Voltage---VIPK(V) 400 380 360 340 320 300 280 260 240 220 200 -75 -50 -25 0 25 50 75 100 125 VCC=5.0V Ichg=Idischg
Saturation Voltage---VCE(sat)(V)
Ambient Temperature---TA()
Standby Supply Current vs Supply Voltage
3.6 3.2
CC(mA)
2.8 2.4 2 1.6 1.2 0.8 0.4 0
0 5 10 15 20 25 30 35 40
Note: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
Supply Current---I
CT=10nF Pin 7=VCC Pin 2=Gnd
Supply Voltage---VCC(V)
MC34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
SO-8 Dimension
Top View A Right side View G
www..com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 7/7
Marking:
I B C H
34063A
J D Front View
Part A
E
Part A
K L N O
8-Lead SO-8 Plastic Package CYStek Package Code: Q8
M
F
*: Typical
DIM A B C D E F G H
Inches Min. Max. 0.1909 0.2007 0.1515 0.1555 0.2283 0.2441 0.0480 0.0519 0.0145 0.0185 0.1472 0.1527 0.0570 0.0649 0.1889 0.2007
Millimeters Min. Max. 4.85 5.10 3.85 3.95 5.80 6.20 1.22 1.32 0.37 0.47 3.74 3.88 1.45 1.65 4.80 5.10
DIM I J K L M N O
Inches Min. Max. 0.0019 0.0078 0.0118 0.0275 0.0074 0.0098 0.0145 0.0204 0.0118 0.0197 0.0031 0.0051 0.0000 0.0059
Millimeters Min. Max. 0.05 0.20 0.30 0.70 0.19 0.25 0.37 0.52 0.30 0.50 0.08 0.13 0.00 0.15
Notes: 1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
* Lead: 42 Alloy; solder plating * Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
* All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. * CYStek reserves the right to make changes to its products without notice. * CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. * CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
MC34063AQ8
CYStek Product Specification

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