MC34063 LINEAR INTEGRATED CIRCUIT
1
DC TO DC CONVERTER
CONTROLLER
DESCRIPTION
The Contek MC34063 is a monolithic regulator
subsystem, intended for use as DC to DC converter.
This device contains a temperature compensated band
gap reference, a duty-cycle control oscillator, driver
and high current output switch. It can be used for step
down, step-up or inverting switching regulators as well
as for series pass regulators.
FEATURES
*Operation from 3.0V to 40V.
*Short circuit current limiting.
*Low standby current.
*Output switch current of 1.5A without external
transistors.
*Frequency of operation from 100Hz to 100kHz.
*Step-up, step-down or inverting switch regulators.
DIP-8
SOP-8
PIN CONFIGURATION
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Driver
Collector
Lpk Sense
Vcc
Comparator
Inverting input
1
2
3
4
8
7
5
6
BLOCK DIAGRAM
8
7
54
2
1
3 6
Q
S
R
C
E
T1
T2
A
Is
D
B
CT
Vcc
GND
TIMING
CAPACITOR
SWITCH
EMITTER
SWITCH
COLLECTOR
1.25Vref
COMP.
OSCILLATOR
COMPARATOR
INVERTINGINPUT
Ipeak
SENSE
DRIVE
COLLECTOR
Contek
MC34063
Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
MC34063 LINEAR INTEGRATED CIRCUIT
2
ABSOLUTE MAXIMUM RATINGS(Ta=25 C )
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc 40 V
Comparator input voltage range Vi(comp) -0.3~+40 V
Switch collector voltage Vc(sw) 40 V
Switch Emitter Voltage Ve(sw) 40 V
Switch collector to emitter voltage Vce(sw) 40 V
Driver collector Voltage Vc(dr) 40 V
Switch current Isw 1.5 A
ELECTRICAL CHARACTERISTICS( Ta=25 C )
(Vcc=5.0V,Ta=0~70 C,unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT
Oscillator
Charging Current Ichg Vcc=5 to 40V,Ta=25 C 22 31 42 mA
Discharging Current Idischg Vcc=5 to 40V,Ta=25 C 140 190 260 mA
Oscillator Amplitude Vosc Ta=25 C 0.5 V
Discharge to Charge Current Ratio K V7=Vcc,Ta=25 C 5.2 6.1 7.5
Current limit Sense Voltage Vsense Ichg=Idischg
Ta=25 C
250 300 350 mV
Output Switch
Saturation Voltage 1(note) Vce(sat)1 Isw=1.0A
Vc(driver)=Vc(sw)
0.95 1.3 V
Saturation Voltage 2(note) Vce(sat)2 Isw=1.0A
Vc(driver)=50mA
0.45 0.7 V
DC Current Gain(note) Gi(DC) Isw=1.0A
Vce=5.0V,Ta=25 C
50 180
Collector Off State Current(note) C(off) Vce=40.0V,Ta=25 C 0.01 100 mA
Comparator
Threshold Voltage Vth 1.21 1.24 1.29 V
Threshold voltage Line Regulation Vth Vcc=3~40V 2.0 5.0 mV
Input Bias Current Ibias Vi=0V 50 400 nA
Total Device
Vcc=5~40V
Ct=0.001
Supply Current Icc V7=Vcc 2.7 4.0 mA
Vc>Vth
Pin2=GND
NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation.
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
MC34063 LINEAR INTEGRATED CIRCUIT
3
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
MC34063 LINEAR INTEGRATED CIRCUIT
4
Contek Contek
Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
MC34063 LINEAR INTEGRATED CIRCUIT
5
Contek
Contek Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
MC34063 LINEAR INTEGRATED CIRCUIT
6
Contek
Contek
Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
