Semiconductor Components Industries, LLC, 2000
August, 2000 Rev. 6
1
Publication Order Number:
MC34063A/D
MC34063A, MC33063A
DC-to-DC Converter
Control Circuits
The MC34063A Series is a monolithic control circuit containing the
primary functions required for DCtoDC 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 StepDown and StepUp and
VoltageInverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
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
Representative Schematic Diagram
S Q
R
Q2
Q1
100
I
pk
Oscillator C
T
Comparator
+
-
1.25 V
Reference
Regulator
1
2
3
4
5
6
7
8
Drive
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
(Bottom View)
This device contains 51 active transistors.
http://onsemi.com
SO8
D SUFFIX
CASE 751
PDIP8
P, P1 SUFFIX
CASE 626
1
8
1
8
1
8
SOEIAJ8
M SUFFIX
CASE 968
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
1
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Driver
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
(Top View)
2
3
4
5
6
7
8
PIN CONNECTIONS
MC34063A, MC33063A
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2
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
V
CC
40
Vdc
Comparator Input Voltage Range
V
IR
0.3 to +40
Vdc
Switch Collector Voltage
V
C(switch)
40
Vdc
Switch Emitter Voltage (V
Pin 1
= 40 V)
V
E(switch)
40
Vdc
Switch Collector to Emitter Voltage
V
CE(switch)
40
Vdc
Driver Collector Voltage
V
C(driver)
40
Vdc
Driver Collector Current (Note 1.)
I
C(driver)
100
mA
Switch Current
I
SW
1.5
A
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
T
A
= 25
C
P
D
1.25
W
Thermal Resistance
R
JA
100
C/W
SOIC Package, D Suffix
T
A
= 25
C
P
D
625
W
Thermal Resistance
R
JA
160
C/W
Operating Junction Temperature
T
J
+150
C
Operating Ambient Temperature Range
T
A
C
MC34063A
0 to +70
MC33063AV
40 to +125
MC33063A
40 to +85
Storage Temperature Range
T
stg
65 to +150
C
1. Maximum package power dissipation limits must be observed.
2. ESD data available upon request.
MC34063A, MC33063A
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3
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V, T
A
= T
low
to T
high
[Note 3.], unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (V
Pin 5
= 0 V, C
T
= 1.0 nF, T
A
= 25
C)
f
osc
24
33
42
kHz
Charge Current (V
CC
= 5.0 V to 40 V, T
A
= 25
C)
I
chg
24
35
42
A
Discharge Current (V
CC
= 5.0 V to 40 V, T
A
= 25
C)
I
dischg
140
220
260
A
Discharge to Charge Current Ratio (Pin 7 to V
CC
, T
A
= 25
C)
I
dischg
/I
chg
5.2
6.5
7.5
Current Limit Sense Voltage (I
chg
= I
dischg
, T
A
= 25
C)
V
ipk(sense)
250
300
350
mV
OUTPUT SWITCH (Note 4.)
Saturation Voltage, Darlington Connection
( I
SW
= 1.0 A, Pins 1, 8 connected)
V
CE(sat)
1.0
1.3
V
Saturation Voltage (Note 5.)
(I
SW
= 1.0 A, R
Pin 8
= 82
to V
CC
, Forced
]
20)
V
CE(sat)
0.45
0.7
V
DC Current Gain (I
SW
= 1.0 A, V
CE
= 5.0 V, T
A
= 25
C)
h
FE
50
75
Collector OffState Current (V
CE
= 40 V)
I
C(off)
0.01
100
A
COMPARATOR
Threshold Voltage
T
A
= 25
C
T
A
= T
low
to T
high
V
th
1.225
1.21
1.25
1.275
1.29
V
Threshold Voltage Line Regulation (V
CC
= 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Reg
line
1.4
1.4
5.0
6.0
mV
Input Bias Current (V
in
= 0 V)
I
IB
20
400
nA
TOTAL DEVICE
Supply Current (V
CC
= 5.0 V to 40 V, C
T
= 1.0 nF, Pin 7 = V
CC
,
V
Pin 5
> V
th
, Pin 2 = Gnd, remaining pins open)
I
CC
4.0
mA
3. T
low
= 0
C for MC34063A, 40
C for MC33063A, AV T
high
= +70
C for MC34063A, +85
C for MC33063A, +125
C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (nonDarlington configuration) at low switch currents (
300 mA) and high driver currents
(
30 mA), it may take up to 2.0
s 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
nonDarlington configuration is used, the following output drive condition is recommended:
Forced
b
of output switch :
IC output
IC driver 7.0 mA *
w
10
* The 100
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
MC34063A, MC33063A
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4
t
on
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 5 = Gnd
T
A
= 25
C
t
off
Figure 1. Output Switch OnOff Time versus
Oscillator Timing Capacitor
Figure 2. Timing Capacitor Waveform
0.01 0.02
0.05 0.1
0.2
0.5 1.0
2.0
5.0 10
C
T
, OSCILLATOR TIMING CAPACITOR (nF)
, OUTPUT
SWITCH ONOFF
TIME ( s)
on-of
f
t
10
s/DIV
, OSCILLA
T
OR VOL
T
AGE (V)
OSC
200 mV/DIV
V
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
C
T
= 1.0 nF
T
A
= 25
C
1000
500
200
100
50
20
10
5.0
2.0
1.0
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
, SA
TURA
TION VOL
T
AGE (V)
CE(sat)
I
E
, EMITTER CURRENT (A)
V
V
CC
= 5.0 V
Pins 1, 7, 8 = V
CC
Pins 3, 5 = Gnd
T
A
= 25
C
(See Note 6.)
, SA
TURA
TION VOL
T
AGE (V)
CE(sat)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
I
C
, COLLECTOR CURRENT(A)
V
Darlington Connection
Forced
= 20
-55
-25
0
25
50
75
100
125
, CURRENT
LIMIT
SENSE VOL
T
AGE (V)
IPK(sense)
T
A
, AMBIENT TEMPERATURE (
C)
V
V
CC
= 5.0 V
I
chg
= I
dischg
0
5.0
10
15
20
25
30
35
40
, SUPPL
Y
CURRENT
(mA)
CC
V
CC
, SUPPLY VOLTAGE (V)
I
C
T
= 1.0 nF
Pin 7 = V
CC
Pin 2 = Gnd
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
400
380
360
340
320
300
280
260
240
220
200
3.6
3.2
2.4
2.0
1.6
1.2
0.8
0.4
0
1.0
2.8
V
CC
= 5.0 V
Pin 7 = V
CC
Pins 2, 3, 5 = Gnd
T
A
= 25
C
(See Note 6.)
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
MC34063A, MC33063A
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5
170
H
L
8
180
7
R
sc
0.22
6
V
in
12 V
100
+
5
R1 2.2 k
R2
47 k
S Q
R
Q2
Q1
I
pk
Osc
C
T
V
CC
+
-
Comp.
1.25 V
Ref
Reg
1
2
3
4
1N5819
C
T
1500
pF
330
C
O
+
V
out
28 V/175 mA
V
out
1.0
H
+
100
Optional Filter
Test
Conditions
Results
Line Regulation
V
in
= 8.0 V to 16 V, I
O
= 175 mA
30 mV =
0.05%
Load Regulation
V
in
= 12 V, I
O
= 75 mA to 175 mA
10 mV =
0.017%
Output Ripple
V
in
= 12 V, I
O
= 175 mA
400 mVpp
Efficiency
V
in
= 12 V, I
O
= 175 mA
87.7%
Output Ripple With Optional Filter
V
in
= 12 V, I
O
= 175 mA
40 mVpp
Figure 7. StepUp Converter
MC34063A, MC33063A
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6
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 7.)
8
7
6
R
sc
V
in
1
2
V
out
R
R 0 for
constant V
in
7. If the output switch is driven into hard saturation (nonDarlington configuration) at low switch currents (
300 mA) and high driver currents
(
30 mA), it may take up to 2.0
s 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
nonDarlington configuration is used, the following output drive condition is recommended.
8
7
6
R
sc
V
in
1
2
V
out
Figure 8. External Current Boost Connections for I
C
Peak Greater than 1.5 A
MC34063A, MC33063A
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7
1.25 V
Ref
Reg
V
out
5.0 V/500 mA
1.0
H
V
out
+
100
Optional Filter
8
7
R
sc
0.33
6
V
in
25 V
100
+
R1 1.2 k
R2
3.6 k
S Q
R
Q2
Q1
I
pk
Osc
C
T
V
CC
+
-
Comp.
1
2
3
4
C
T
470
pF
470
C
O
+
5
L
1N5819
220
H
Test
Conditions
Results
Line Regulation
V
in
= 15 V to 25 V, I
O
= 500 mA
12 mV =
0.12%
Load Regulation
V
in
= 25 V, I
O
= 50 mA to 500 mA
3.0 mV =
0.03%
Output Ripple
V
in
= 25 V, I
O
= 500 mA
120 mVpp
Short Circuit Current
V
in
= 25 V, R
L
= 0.1
1.1 A
Efficiency
V
in
= 25 V, I
O
= 500 mA
83.7%
Output Ripple With Optional Filter
V
in
= 25 V, I
O
= 500 mA
40 mVpp
Figure 9. StepDown Converter
10a. External NPN Switch
10b. External PNP Saturated Switch
8
7
6
R
sc
V
in
1
2
V
out
8
7
6
R
sc
V
in
1
2
V
Figure 10. External Current Boost Connections for I
C
Peak Greater than 1.5 A
MC34063A, MC33063A
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8
1.25 V
Ref
Reg
V
out
-12 V/100 mA
V
out
1.0
H
+
100
Optional Filter
8
7
R
sc
0.24
6
V
in
4.5 V to 6.0 V
100
+
5
R2 8.2 k
S Q
R
Q2
Q1
I
pk
Osc
C
T
Comp.
R1
953
1
2
3
4
+ 1500
pF
+
-
1N5819
1000
f
+
88
H
V
CC
C
O
L
Test
Conditions
Results
Line Regulation
V
in
= 4.5 V to 6.0 V, I
O
= 100 mA
3.0 mV =
0.012%
Load Regulation
V
in
= 5.0 V, I
O
= 10 mA to 100 mA
0.022 V =
0.09%
Output Ripple
V
in
= 5.0 V, I
O
= 100 mA
500 mVpp
Short Circuit Current
V
in
= 5.0 V, R
L
= 0.1
910 mA
Efficiency
V
in
= 5.0 V, I
O
= 100 mA
62.2%
Output Ripple With Optional Filter
V
in
= 5.0 V, I
O
= 100 mA
70 mVpp
Figure 11. Voltage Inverting Converter
12a. External NPN Switch
12b. External PNP Saturated Switch
8
7
6
V
in
1
2
V
out
8
7
6
V
in
1
2
V
out
Figure 12. External Current Boost Connections for I
C
Peak Greater than 1.5 A
MC34063A, MC33063A
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9
5.45
2.500
(Top view, copper foil as seen through the board from the component side)
(Top View, Component Side)
*Optional Filter.
Figure 13. Printed Circuit Board and Component Layout
(Circuits of Figures 7, 9, 11)
MC34063A
MC34063A
MC34063A
INDUCTOR DATA
Converter
Inductance (
H)
Turns/Wire
StepUp
170
38 Turns of #22 AWG
StepDown
220
48 Turns of #22 AWG
VoltageInverting
88
28 Turns of #22 AWG
All inductors are wound on Magnetics Inc. 55117 toroidal core.
MC34063A, MC33063A
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10
Calculation
StepUp
StepDown
VoltageInverting
t
on
/t
off
Vout
)
V
F
*
V
in(min)
V
in(min)
*
Vsat
Vout
)
V
F
V
in(min)
*
Vsat
*
Vout
|Vout|
)
V
F
V
in
*
Vsat
(t
on
+ t
off
)
1
f
1
f
1
f
t
off
ton
)
t
off
ton
t
off
)
1
ton
)
t
off
ton
t
off
)
1
ton
)
t
off
ton
t
off
)
1
t
on
(t
on
+ t
off
) t
off
(t
on
+ t
off
) t
off
(t
on
+ t
off
) t
off
C
T
4.0 x 10
5
t
on
4.0 x 10
5
t
on
4.0 x 10
5
t
on
I
pk(switch)
2I
out(max)
ton
t
off
)
1
2I
out(max)
2I
out(max)
ton
t
off
)
1
R
sc
0.3/I
pk(switch)
0.3/I
pk(switch)
0.3/I
pk(switch)
L
(min)
(V
in(min)
*
Vsat)
I
pk(switch)
t
on(max)
(V
in(min)
*
Vsat
*
Vout)
I
pk(switch)
t
on(max)
(V
in(min)
*
Vsat)
I
pk(switch)
t
on(max)
C
O
9
Ioutton
V
ripple(pp)
I
pk(switch)
(ton
)
t
off
)
8V
ripple(pp)
9
Ioutton
V
ripple(pp)
V
sat
= Saturation voltage of the output switch.
V
F
= Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V
in
Nominal input voltage.
V
out
Desired output voltage,
I
out
Desired output current.
f
min
Minimum desired output switching frequency at the selected values of V
in
and I
O
.
V
ripple(pp)
Desired peaktopeak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
equivalent series
resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the
line and load regulation.
NOTE:
For further information refer to Application Note AN920A/D and AN954/D.
|V
out
|
+
1.25 1
)
R2
R1
Figure 14. Design Formula Table
MC34063A, MC33063A
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11
ORDERING INFORMATION
Device
Package
Shipping
MC33063AD
SO8
98 Units / Rail
MC33063ADR2
SO8
2500 Units / Tape & Reel
MC33063AP1
DIP8
50 Units / Rail
MC33063AVD
SO8
98 Units / Rail
MC33063AVDR2
SO8
2500 Units / Tape & Reel
MC33063AVP
DIP8
50 Units / Rail
MC34063AD
SO8
98 Units / Rail
MC34063ADR2
SO8
2500 Units / Tape & Reel
MC34063AP1
DIP8
50 Units / Rail
MC34063BD
SO8
98 Units / Rail
MC34063BDR2
SO8
2500 Units / Tape & Reel
MC34063AM
SOEIAJ8
94 Units / Rail
MC34063AMEL
SOEIAJ8
1000 Units / Tape & Reel
MC34063AML1
SOEIAJ8
1000 Units / Tape & Reel
MC34063AML2
SOEIAJ8
2000 Units / Tape & Reel
MC34063AMR1
SOEIAJ8
1000 Units / Tape & Reel
MC34063AMR2
SOEIAJ8
2000 Units / Tape & Reel
MARKING DIAGRAMS
1
8
1
8
ALYW
M063A
1
8
PDIP8
P, P1 SUFFIX
CASE 626
SO8
D SUFFIX
CASE 751
SOEIAJ8
M SUFFIX
CASE 968
x
= 3 or 4
z
= A denotes AD suffix
J denotes BD suffix
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W
= Work Week
ALYWz
34063
1
8
PDIP8
P, P1 SUFFIX
CASE 626
AWL
33063AVP
1
8
SO8
D SUFFIX
CASE 751
YYWW
AWL
3x063AP1
YYWW
ALYWz
3x063
MC34063A, MC33063A
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12
PACKAGE DIMENSIONS
SEATING
PLANE
1
4
5
8
A
0.25
M
C B
S
S
0.25
M
B
M
h
q
C
X 45
_
L
DIM
MIN
MAX
MILLIMETERS
A
1.35
1.75
A1
0.10
0.25
B
0.35
0.49
C
0.19
0.25
D
4.80
5.00
E
1.27 BSC
e
3.80
4.00
H
5.80
6.20
h
0
7
L
0.40
1.25
q
0.25
0.50
_
_
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETER.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
D
E
H
A
B
e
B
A1
C
A
0.10
PDIP8
P, P1 SUFFIX
PLASTIC PACKAGE
CASE 62605
ISSUE K
SO8
D SUFFIX
PLASTIC PACKAGE
CASE 75106
ISSUE T
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
MIN
MIN
MAX
MAX
MILLIMETERS
INCHES
DIM
9.40
6.10
3.94
0.38
1.02
0.76
0.20
2.92
0.76
10.16
6.60
4.45
0.51
1.78
1.27
0.30
3.43
0.370
0.240
0.155
0.015
0.040
0.030
0.008
0.115
0.030
0.400
0.260
0.175
0.020
0.070
0.050
0.012
0.135
10
1.01
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
A
B
C
D
F
G
H
J
K
L
M
N
10
0.040
F
H
G
D
N
C
K
M
J
L
NOTE 2
1
4
5
8
T
0.13 (0.005)
A
B
M
M
M
A
B
T
SEATING
PLANE
MC34063A, MC33063A
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13
e
0.10 (0.004)
DIM
A
MIN
MAX
MIN
MAX
INCHES
--- 2.05
--- 0.081
MILLIMETERS
A
0.05
0.20
0.002
0.008
b
0.35
0.50
0.014
0.020
c
0.18
0.27
0.007
0.011
D
5.10
5.50
0.201
0.217
E
5.10
5.45
0.201
0.215
e
1.27 BSC
0.050 BSC
H
7.40
8.20
0.291
0.323
L
0.50
0.85
0.020
0.033
L
1.10
1.50
0.043
0.059
M
0 10 0 10
Q
0.70
0.90
0.028
0.035
Z
--- 0.94
--- 0.037
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER
3. DIMENSION D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED AT
THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
5. THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT MINIMUM SPACE BETWEEN
PROTRUSIONS AND ADJACENT LEAD TO BE 0.46
(0.018).
1
E
E
1
Z
D
E HE
1
4
5
8
b
0.13 (0.005)
M
A
1
A
c
M
LE
L
Q1
DETAIL P
P
SOEIAJ8
M SUFFIX
PLASTIC PACKAGE
CASE 96801
ISSUE O
MC34063A, MC33063A
http://onsemi.com
14
Notes
MC34063A, MC33063A
http://onsemi.com
15
Notes
MC34063A, MC33063A
http://onsemi.com
16
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