1.5 A, Step-Up/Down/
Inverting Switching
Regulators
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The MC34063A Series is a monolithic control circuit containing the
primary functions required for DC−to−DC converters. These devices
consist of an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit,
driver and high current output switch. This series was specifically
designed to be incorporated in Step−Down and Step−Up and
Voltage−Inverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
Features
• Operation from 3.0 V to 40 V Input
• Low Standby Current
• Current Limiting
• Output Switch Current to 1.5 A
• Output Voltage Adjustable
• Frequency Operation to 100 kHz
• Precision 2% Reference
• Pb−Free Packages are Available
Q1
1
Switch
Collector
2
Switch
Emitter
3
Timing
Capacitor
45
GND
Drive
Collector
Sense
V
Comparator
Inverting
Input
8
SQ
7
I
pk
Oscillator
6
CC
R
I
pk
C
Comparator
+
-
(Bottom View)
T
Q2
100
1.25 V
Reference
Regulator
MARKING
DIAGRAMS
8
3x063
ALYWA
8
1
8
1
1
x= 3 or 4
A= Assembly Location
L, WL= Wafer Lot
Y, YY= Year
W, WW = Work Week
G or G= Pb−Free Package
See detailed ordering and shipping information in the package
ORDERING INFORMATION
dimensions section on page 12 of this data sheet.
1Publication Order Number:
MC34063A/D
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Switch
Collector
Switch
Emitter
Timing
Capacitor
GND
1
2
3
45
(Top View)
8
7
6
Driver
Collector
I
Sense
pk
V
CC
Comparator
Inverting
Input
Switch Collector
Switch Emitter
Timing Capacitor
GND
EP Flag
(Top View)
Driver Collector
I
Sense
pk
V
CC
Comparator
Inverting Input
Figure 2. Pin Connections
MAXIMUM RATINGS
RatingSymbolValueUnit
Power Supply VoltageV
Comparator Input Voltage RangeV
Switch Collector VoltageV
Switch Emitter Voltage (V
= 40 V)V
Pin 1
Switch Collector to Emitter VoltageV
Driver Collector VoltageV
Driver Collector Current (Note 1)I
Switch CurrentI
CC
IR
C(switch)
E(switch)
CE(switch)
C(driver)
C(driver)
SW
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
TA = 25°CP
Thermal Resistance
D
R
q
JA
SOIC Package, D Suffix
TA = 25°CP
Thermal Resistance
D
R
q
JA
DFN Package
TA = 25°CP
Thermal Resistance
Operating Junction TemperatureT
Operating Ambient Temperature RangeT
D
R
q
JA
J
A
MC34063A, SC34063A0 to +70
MC33063AV, NCV33063A−40 to +125
MC33063A, SC33063A−40 to + 85
Storage Temperature RangeT
stg
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum package power dissipation limits must be observed.
2. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per MIL−STD−883, Method 3015.
Machine Model Method 400 V.
3. NCV prefix is for automotive and other applications requiring site and change control.
40Vdc
−0.3 to + 40Vdc
40Vdc
40Vdc
40Vdc
40Vdc
100mA
1.5A
1.25W
115°C/W
625mW
160°C/W
1.25mW
80°C/W
+150°C
°C
−65 to +150°C
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2
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
ELECTRICAL CHARACTERISTICS (V
Characteristics
= 5.0 V, TA = T
CC
low
to T
[Note 4], unless otherwise specified.)
high
SymbolMinTypMaxUnit
OSCILLATOR
Frequency (V
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)I
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)I
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)I
Current Limit Sense Voltage (I
= 0 V, CT = 1.0 nF, TA = 25°C)f
Pin 5
chg
= I
, TA = 25°C)V
dischg
osc
chg
dischg
dischg/Ichg
ipk(sense)
243342kHz
243542
140220260
mA
mA
5.26.57.5−
250300350mV
OUTPUT SWITCH (Note 5)
Saturation Voltage, Darlington Connection
= 1.0 A, Pins 1, 8 connected)
(I
SW
Saturation Voltage (Note 6)
(I
= 1.0 A, R
SW
= 82 W to VCC, Forced b ] 20)
Pin 8
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)h
Collector Off−State Current (VCE = 40 V)I
V
CE(sat)
V
CE(sat)
C(off)
FE
−1.01.3V
−0.450.7V
5075−−
−0.01100
mA
COMPARATOR
Threshold Voltage
= 25°C
T
A
= T
T
to T
A
low
high
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063, MC34063
MC33063V, NCV33063
Input Bias Current (Vin = 0 V)I
Reg
V
th
line
IB
1.225
1.21
−
−
1.25−1.275
1.29
1.4
1.4
5.0
6.0
−− 20−400nA
V
mV
TOTAL DEVICE
Supply Current (V
> Vth, Pin 2 = GND, remaining pins open)
V
Pin 5
4. T
= 0°C for MC34063, SC34063; − 40°C for MC33063, SC33063, MC33063V, NCV33063
low
= +70°C for MC34063, SC34063; +85°C for MC33063, SC33063; +125°C for MC33063V, NCV33063
T
high
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
= 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,
CC
I
CC
−−4.0mA
6. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥ 30 mA), it may take up to 2.0 ms for it to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is
magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended:
Forced b of output switch :
ICoutput
ICdriver – 7.0 mA *
w 10
* The 100 W resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
8. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥ 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended.
out
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6
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
V
Q1
1
2
1N5819
3
C
T
470
4
L
pF
+
470C
220 mH
5.0 V/500 mA
O
V
out
1.0 mH
V
25 V
R
0.33
in
100
R1 1.2 k
8
SQ
Q2
R
7
I
sc
6
+
pk
V
CC
+
-
OSC
Comp.
C
T
1.25 V
Ref
Reg
5
R2
3.6 k
TestConditionsResults
Line RegulationVin = 15 V to 25 V, IO = 500 mA12 mV = ±0.12%
Load RegulationVin = 25 V, IO = 50 mA to 500 mA3.0 mV = ±0.03%
Figure 15. Printed Circuit Board and Component Layout
(Circuits of Figures 9, 11, 13)
INDUCTOR DATA
Converter
Step−Up17038 Turns of #22 AWG
Step−Down22048 Turns of #22 AWG
Voltage−Inverting8828 Turns of #22 AWG
All inductors are wound on Magnetics Inc. 55117 toroidal core.
Inductance (mH)
Turns/Wire
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9
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Figure 16. Printed Circuit Board for DFN Device
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10
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
)
Calculation
ton/t
off
(ton + t
t
off
t
on
C
T
I
pk(switch)
R
sc
L
(min)
)
off
ǒ
C
O
V
= Saturation voltage of the output switch.
sat
V
= Forward voltage drop of the output rectifier.
F
The following power supply characteristics must be chosen:
V
− Nominal input voltage.
in
− Desired output voltage,
V
out
I
− Desired output current.
out
f
− Minimum desired output switching frequency at the selected values of Vin and IO.
min
V
NOTE: For further information refer to Application Note AN920A/D and AN954/D.
− Desired peak−to−peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
ripple(pp)
equivalent seriesresistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the
line and load regulation.
Step−UpStep−DownVoltage−Inverting
V
out
2I
out(max)
(V
in(min)
) VF* V
V
in(min)
ton) t
t
on
t
off
(ton + t
4.0 x 10−5 t
0.3/I
pk(switch)
* V
I
pk(switch)
I
out
9
V
ripple(pp)
|V
out
in(min)
* V
sat
1
f
off
) 1
) − t
off
off
on
t
on
ǒ
t
t
| + 1.25ǒ1 )
off
on
sat
) 1
)
Ǔ
Ǔ
t
on(max)
R2
R1
Ǔ
ǒ
(V
in(min)
V
in(min)
(ton + t
4.0 x 10−5 t
* V
I
pk(switch)
I
pk(switch)
V
out
* V
ton) t
t
on
t
off
2I
out(max)
0.3/I
pk(switch)
sat
8V
ripple(pp)
) V
sat
1
f
) 1
) − t
off
* V
(ton) t
off
off
on
F
* V
out
)
Ǔ
off
out
t
on(max
)
ǒ
2I
(V
in(min)
|V
out
Vin* V
ton) t
t
on
t
off
(ton + t
4.0 x 10−5 t
out(max)
0.3/I
* V
I
pk(switch)
9
V
| ) V
sat
1
f
off
) 1
) − t
off
t
on
ǒ
t
off
pk(switch)
)
sat
I
t
on
out
ripple(pp)
F
off
on
) 1
Ǔ
Ǔ
t
on(max)
Figure 17. Design Formula Table
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11
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
ORDERING INFORMATION
DevicePackageShipping
MC33063ADSOIC−898 Units / Rail
MC33063ADGSOIC−8
MC33063ADR2SOIC−82500 Units / Tape & Reel
MC33063ADR2GSOIC−8
SC33063ADR2GSOIC−8
MC33063AP1PDIP−850 Units / Rail
MC33063AP1GPDIP−8
MC33063AVDSOIC−898 Units / Rail
MC33063AVDGSOIC−8
MC33063AVDR2SOIC−8
MC33063AVDR2GSOIC−8
NCV33063AVDR2*SOIC−8
NCV33063AVDR2G*SOIC−8
MC33063AVPPDIP−850 Units / Rail
MC33063AVPGPDIP−8
MC34063ADSOIC−898 Units / Rail
MC34063ADGSOIC−8
MC34063ADR2SOIC−82500 Units / Tape & Reel
MC34063ADR2GSOIC−8
SC34063ADR2GSOIC−8
MC34063AP1PDIP−850 Units / Rail
MC34063AP1GPDIP−8
SC34063AP1GPDIP−8
MC33063MNTXGDFN8
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specification Brochure, BRD8011/D.
*NCV33063A: T
change control.
= −40°C, T
low
= +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and
high
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
(Pb−Free)
98 Units / Rail
2500 Units / Tape & Reel
2500 Units / Tape & Reel
50 Units / Rail
98 Units / Rail
2500 Units / Tape & Reel
50 Units / Rail
98 Units / Rail
2500 Units / Tape & Reel
2500 Units / Tape & Reel
50 Units / Rail
50 Units / Rail
4000 Units / Tape & Reel
†
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12
−Y−
−Z−
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
PACKAGE DIMENSIONS
SOIC−8 NB
CASE 751−07
ISSUE AJ
−X−
B
H
A
58
1
4
G
D
0.25 (0.010)Z
M
S
Y
0.25 (0.010)
C
SEATING
PLANE
SXS
M
0.10 (0.004)
M
Y
K
N
X 45
_
M
J
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
1. DIMENSIONS AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.15 AND 0.30MM FROM TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
5. DETAILS A AND B SHOW OPTIONAL
CONSTRUCTIONS FOR TERMINALS.
DIM MIN MAX
A 0.80 1.00
A1 0.00 0.05
A30.20 REF
b 0.25 0.35
D4.00 BSC
D2 1.91 2.21
E4.00 BSC
E2 2.09 2.39
e0.80 BSC
K 0.20−−−
L 0.30 0.50
L1 −−− 0.15
C0.15
C0.15
C0.10
C0.08
SIDE VIEW
D
TOP VIEW
DETAIL B
(A3)
A1
A
B
L
L
L1
E
A
SEATING
C
PLANE
DETAIL A
OPTIONAL
CONSTRUCTIONS
MOLD CMPDEXPOSED Cu
DETAIL B
ALTERNATE
CONSTRUCTIONS
A1
MILLIMETERS
DETAIL A
D2
1
8X L
4
SOLDERING FOOTPRINT*
2.21
8X
0.63
E2
K
e
BOTTOM VIEW
58
8X
b
0.10 C
AB
NOTE 3
0.05 C
4.30
2.39
0.80
PITCH
PACKAGE
OUTLINE
8X
0.35
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SENSEFET is a trademark of Semiconductor Components Industries, LLC.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867Toll Free USA/Canada
Email: orderlit@onsemi.com
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
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15
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
MC34063A/D
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