Part Number: MC34063ACD-TR

Cross Number:

Item Description: Conv DC-DC Step Down/Step Up3V to 40V 8-Pin SO N T/R

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

MC34063A
DC-DC CONVERTER CONTROL CIRCUITS
April 2000
OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A
2% REFERENCE ACCURACY
LOW QUIESCENTCURRENT: 2.5mA (TYP.)
OPERATINGFROM 3V TO 40V
FREQUENCY OPERATION TO 100KHz
ACTIVECURRENT LIMITING
DESCRIPTION
The MC34063A 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 devices series is
designed for Step-Down, Step-Up and
Voltage-Invertingapplications.
BLOCK DIAGRAM
DIP-8
SO-8
1/15
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
Power Supply Voltage 50 V
V
ir
Comparator Input Voltage Range -0.3 to 40 V
V
SWC
Switch Collector Voltage 40 V
V
SWE
Switch Emitter Voltage (VSWC = 40V) 40 V
V
CE
Switch Emitter to Collector Voltage 40 V
V
dc
Driver Collector Voltage 40 V
I
dc
Driver Collector Current 100 mA
I
SW
Switch Current 1.5 A
P
tot
Power Dissipation at T
amb
=25
o
C (for
Plastic Package
)
(for SOIC Package)
1.25
0.625
W
T
op
Operating Ambient Temperature Range (for AC SERIES)
(for AB SERIES)
0to70
-40to85
o
C
o
C
T
stg
Storage Temperature Range - 40 to 150
o
C
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
THERMALDATA
Symbol Parameter DIP-8 SO-8 Unit
R
thj-amb
Thermal Resistance Junction-ambient (*) Max 100 160
o
C/W
(*) This value depends from thermal design of PCB on which the device is mounted.
ORDERING NUMBERS
Type DIP-8 SO-8 SO-8 (tape & reel)
MC34063AB MC34063ABN MC34063ABD MC34063ABD-TR
MC34063AC MC34063ACN MC34063ACD MC34063ACD-TR
CONNECTION DIAGRAM
(top view)
PIN CONNECTIONS
Pin No Symbol Name and Function
1 SWC Switch Collector
2 SWE Switch Emitter
3 TC Timing Capacitor
4 GND Ground
5 CII Comparator Inverting Input
6V
CC
Voltage Supply
7I
pk
I
pk
Sense
8 DRC Voltage Driver Collector
MC34063A
2/15
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, V
CC
= 5V, T
a
=T
LOW
to T
HIGH
, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol Parameter Test Conditions Min. Typ. Max. Unit
f
OSC
Frequency V
pin5
=0V C
T
= 1 nF T
a
=25
o
C243342KHz
I
chg
Charge Currernt V
CC
= 5 to 40V T
a
=25
o
C 243342
µ
A
I
dischg
Discharge Current V
CC
= 5 to 40V T
a
=25
o
C 140 200 260
µ
A
I
dischg
/I
chg
Discharge to Charge
Current Ratio
Pin 7 = V
CC
T
a
=25
o
C 5.2 6.2 7.5
V
ipk(sense)
Current Limit Sense Voltage I
chg
=I
dischg
T
a
=25
o
C 250 300 350 mV
OUTPUT SWITCH
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
CE(sat)
Saturation Voltage,
Darlington Connection
I
SW
= 1 A Pins1, 8 connected 1 1.3 V
V
CE(sat)
Saturation Voltage I
SW
=1A R
pin8
=82
to V
CC
,
Forced
β
~20
0.45 0.7 V
h
FE
DC Current Gain I
SW
=1A V
CE
=5V T
a
=25
o
C50120
I
C(off)
Collector Off-StateCurrent V
CE
= 40 V 0.01 100 µA
COMPARATOR
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
th
Threshold Voltage T
a
=25
o
C
T
a
=T
LOW
to T
HIGH
1.225
1.21
1.25 1.275
1.29
V
V
Reg
line
Threshold VoltageLine
Regulation
V
CC
= 3 to 40V 1 5 mV
I
IB
Input Bias Current V
IN
= 0 V -5 -400 nA
TOTAL DEVICE
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
CC
Supply Current V
CC
= 5 to 40V C
T
=1nF
Pin 7 = V
CC
V
pin5
>V
th
Pin 2 = GND
Remaining pins open
2.5 4 mA
NOTES:
1) Maximum package power dissipation limit must be observed.
2) T
LOW
=0
o
C, T
HIGH
=70
o
C (AC series); T
LOW
= -40
o
C, T
HIGH
=85
o
C (AB 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 = I
COUTPUT
/(I
CDRIVER
- 1mA*) 10
* Current less due to a built in 1K
antileakage resistor.
MC34063A
3/15
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