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Partno	Mfg	Dc	Qty	Available	Descript
MC34063AB	ST	N/a	251	avai	DC-DC CONVERTER CONTROL CIRCUITS
MC34063EB	ST	N/a	50	avai	DC-DC CONVERTER CONTROL CIRCUITS
MC34063EC	ST	N/a	1100	avai	DC-DC CONVERTER CONTROL CIRCUITS

MC34063EC ,DC-DC CONVERTER CONTROL CIRCUITSBLOCK DIAGRAMMarch 2004 1/16MC34063A/E
MC34063ECD ,DC-DC CONVERTER CONTROL CIRCUITSELECTRICAL CHARACTERISTICS (Refer to the test circuits, V = 5V, T = T to T , unlessCC a LOW HIGHoth ..
MC34063ECD-TR ,DC-DC CONVERTER CONTROL CIRCUITSABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Power Supply Voltage 50 VCCVir Comparator Inpu ..
MC34063ECN ,DC-DC CONVERTER CONTROL CIRCUITSELECTRICAL CHARACTERISTICSEmitter Follower Configuration Output Saturation Output Switch ON-OFF Tim ..
MC34063ECN ,DC-DC CONVERTER CONTROL CIRCUITSELECTRICAL CHARACTERISTICSEmitter Follower Configuration Output Saturation Output Switch ON-OFF Tim ..
MC34064 ,UnderVoltage Sensing CircuitThermal CharacteristicsP Suffix, Plastic PackageP 625 mWMaximum Power Dissipation @ T = 25°C DAR 20 ..
MC74LCX373DT ,Low-Voltage CMOS Octal Transparent Latch**SEMICONDUCTOR TECHNICAL DATA* ’** *$ * **$"**#!*" * **$ **$*$* **"**$ * **!%$# *%$!%$#*$*$** * ..
MC74LCX373DW ,LOW-VOLTAGE CMOS OCTAL TRANSPARENT LATCHMAXIMUM RATINGS*Symbol Parameter Value Condition UnitV DC Supply Voltage –0.5 to +7.0 VCCV DC Input ..
MC74LCX373DWR2 ,Low-Voltage CMOS Octal Transparent LatchFeatures• Designed for 2.3 to 3.6 V V OperationCC20• 5 V Tolerant − Interface Capability With 5 V T ..
MC74LCX373M ,Low Voltage CMOS Octal transparent Latch with 5V-Tolerant Inputs and Outputs (3-state, Non-Inverting)LOGIC DIAGRAM1OE11LE2nLE3 O0QD0 D5nLE4 O1QD1D6nLE7 O2QD2 D9nLE8 O3QD3 D12nLE13 O4QD4 D15nLE14 O5QD5 ..
MC74LCX374 ,LOW-VOLTAGE CMOS OCTAL D-TYPE FLIP-FLOPThe MC74LCX374 is a high performance, non−inverting octalD−type flip−flop operating from a 2.3 to 3 ..
MC74LCX374DT ,LOW-VOLTAGE CMOS OCTAL D-TYPE FLIP-FLOP**SEMICONDUCTOR TECHNICAL DATA*")**" & * &* *#* * *#** "#**&* " *$*!& * *!#’&% *!* *’&#’&%*&*&** ..

MC34063AB-MC34063EB-MC34063EC
DC-DC CONVERTER CONTROL CIRCUITS
1/16March 2004 OUTPUT SWITCH CURRENTIN EXCESS 1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT: 2.5mA (TYP.) OPERATINGFROM3V TO40V FREQUENCY OPERATIONTO 100KHz ACTIVE CURRENT LIMITING
DESCRIPTION
The MC34063A/E seriesisa monolithic control
circuit delivering the main functionsfor DC/DC
voltage converting.
The device contains an internal temperature
compensated reference, comparator, duty cycle
controlled oscillator withan active current limit
circuit, driver and high current output switch.
Output voltageis adjustable through two external
resistors witha2% reference accuracy.
Employinga minimum number of external
componentsthe MC34063A/E devices seriesis
designed for Step-Down, Step-Up and
Voltage-Inverting applications.
MC34063A
MC34063E
DC/DC CONVERTER CONTROL CIRCUITS
BLOCK DIAGRAM
MC34063A/E
ABSOLUTE MAXIMUM RATINGS
AbsoluteMaximum Ratingsare those values beyond which damagetothe devicemay occur. Functional operation under theseconditionis
not implied.
THERMAL DATA
(*)This value dependsfrom thermal designofPCBon whichthe deviceis mounted.
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
MC34063A/E
3/16
ORDERING CODES
(*)The"A" versionisnot recommendedfornew designs.
ELECTRICAL CHARACTERISTICS (Refertothe test circuits, VCC =5V,TA =TLOWto THIGH, unless
otherwise specified, see note2)
OSCILLATOR
OUTPUT SWITCH
COMPARATOR
MC34063A/E
4/16
TOTAL DEVICE
NOTES: Maximum package power dissipationlimit mustbe observed. TLOW =0°C, THIGH= 70°C(ACandEC series); TLOW =-40°C, THIGH= 85°C(AB series); TLOW= -40°C, THIGH= 125°C(EB series).If Darlington configurationisnot used,caremust betakento avoid deep saturationof output switch.The resulting switch-offtimemaybe
adversely affected.Ina Darlington configurationthe following output driver conditionis suggested:
Forcedβof output current switch= ICOUTPUT/(ICDRIVER -1mA*)≥10 Currentlessduetoabuiltin1KΩanti leakage resistor. Start-up Voltageisthe minimum Power Supply Voltageat whichthe internal oscillator beginsto work.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure1: Emitter Follower Configuration Output
Saturation Voltagevs Emitter Current
Figure2: Output Switch ON-OFF Timevs
Oscillator Timing Capacitor
Figure3: Common Emitter Configuration Output
Switch Saturation Voltagevs Collector Current
Figure4: Darlington Configuration Collector
Emitter Saturation Voltage(V CEsat)vs Temperat.
MC34063A/E
5/16
Figure5: Power Collector Emitter Saturation
Voltage(V CEsat)vs Temperature
Figure6: Current Limit Sense Voltage(VIPK)vs
Temperature
Figure7: Reference Voltagevs Temperature
Figure8: Bias Currentvs Temperature
Figure9: Supply Currentvs Temperature
Figure10: Supply Currentvs Input Voltage
MC34063A/E
6/16
TYPICAL APPLICATION CIRCUIT
Step-UP Converter
Printed Demoboard
Test Condition(VOUT= 28V)
MC34063A/E
7/16
Step-Down Converter
Printed Demoboard
Test Condition (VOUT =5V)
MC34063A/E
8/16
Voltage Inverting Converter
Printed Demoboard
Test Condition (VOUT= -12V)

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