CONTEK MC34063 Datasheet
MC34063 LINEAR INTEGRATED CIRCUIT
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.
PIN CONFIGURATION
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
1
2
3
4
Contek
MC34063
8
7
6
5
Driver
Collector
Lpk Sense
Vcc
Comparator
Inverting input
SOP-8
DIP-8
BLOCK DIAGRAM
COLLECTOR
CAPACITOR
CONTEK
E
SWITCH
SWITCH
EMITTER
TIMING
GND
T2
1
T1
Q
2
A
3 6
1.25Vref
C
CT
OSCILLATOR
S
R
Is
COMP.
DRIVE
8
COLLECTOR
D
Ipeak
7
SENSE
Vcc
COMPARATOR
54
B
INVERTINGINPUT
Contek
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
MC34063 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25 C )
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)
Oscillator
Charging Current Ichg
Discharging Current Idischg
Oscillator Amplitude Vosc
Discharge to Charge Current Ratio K
Current limit Sense Voltage Vsense Ichg=Idischg
Output Switch
Saturation Voltage 1(note) Vce(sat)1 Isw=1.0A
Saturation Voltage 2(note) Vce(sat)2 Isw=1.0A
DC Current Gain(note) Gi(DC) Isw=1.0A
Collector Off State Current(note) C(off)
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
Supply Current Icc V7=Vcc 2.7 4.0 mA
PARAMETER SYMBOL VALUE UNIT
PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT
Vcc=5 to 40V,Ta=25 C
Vcc=5 to 40V,Ta=25 C
Ta=25 C
V7=Vcc,Ta=25 C
Ta=25 C
Vc(driver)=Vc(sw)
Vc(driver)=50mA
Vce=5.0V,Ta=25 C
Vce=40.0V,Ta=25 C
Vcc=5~40V
Ct=0.001
Vc>Vth
Pin2=GND
22 31 42
140 190 260
0.5 V
5.2 6.1 7.5
250 300 350 mV
0.95 1.3 V
0.45 0.7 V
50 180
0.01 100
mA
mA
mA
NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation.
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
2
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