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MC34063ABD-TR |MC34063ABDTRSTMN/a10000avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ABD-TR |MC34063ABDTRST,STN/a10000avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ABD-TR |MC34063ABDTRSTN/a50000avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ACDSTN/a80896avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ACD-TR |MC34063ACDTRST/ONN/a232avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ACNSTN/a97avaiDC/DC CONVERTER CONTROL CIRCUIT
MC34063EBDN/a390avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063EBDSTMN/a557avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063EBD-TR |MC34063EBDTRST,STN/a10000avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063EBNSTM ?N/a700avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063EBNST N/a2680avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ECDSTN/a360avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ECD-TR |MC34063ECDTRSTN/a630avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ECNSTMN/a50avaiDC-DC CONVERTER CONTROL CIRCUITS
MC34063ECNSTN/a2300avaiDC-DC CONVERTER CONTROL CIRCUITS


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MC34063ABD-TR-MC34063ACD-MC34063ACD-TR-MC34063ACN-MC34063EBD-MC34063EBD-TR-MC34063EBN-MC34063ECD-MC34063ECD-TR-MC34063ECN
DC-DC CONVERTER CONTROL CIRCUITS
MC34063A
MC34063E

DC-DC CONVERTER CONTROL CIRCUITS
March 2001 OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT: 2.5mA (TYP.) OPERATING FROM 3V TO 40V FREQUENCY OPERATION TO 100KHz ACTIVE CURRENT LIMITING
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
Voltage-Inverting applications.
BLOCK DIAGRAM

1/15
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
THERMAL DATA

(*) This value depends from thermal design of PCB on which the device is mounted.
ORDERING NUMBERS

(*) The "A" version is not recommended for new designs.
CONNECTION DIAGRAM (top view) PIN CONNECTIONS
MC34063A/E

2/15
ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC = 5V, Ta = TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
OUTPUT SWITCH
COMPARATOR
TOTAL DEVICE
NOTES:
1) Maximum package power dissipation limit must be observed.
2) TLOW = 0 o C, THIGH = 70 o C (AC and EC series); TLOW = -40 o C, THIGH = 85 o C (AB series); TLOW = -40 o C, THIGH = 125 o C (EB series).
3) 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 - 1mA*) ≥ 10
* Current less due to a built in 1KΩ antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begins to work.
MC34063A/E

3/15
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
Power Collector Emitter Saturation Voltage
(VCE(sat)) vs Temperature
Darlington Configuration Collector Emitter
Saturation Voltage (VCE(sat)) vs Temperature
Current Limit Sense Voltage Voltage (Vipk) vs
Temperature
Emitter Follower Configuration Output Saturation
Voltage vs Emitter Current
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
TYPICAL ELECTRICAL CHARACTERISTICS
MC34063A/E

4/15
Supply Current vs Temperature Supply Current vs Input Voltage
Reference Voltage vs Temperature Bias Current vs Temperature
TYPICAL ELECTRICAL CHARACTERISTICS (Continued)
MC34063A/E

5/15
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