ON Semiconductor MC34063A, MC33063A Technical data

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MC34063A, MC33063A

DC-to-DC Converter
Control Circuits

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.

• 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

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8

1

8

1

8

1

PDIP–8

P, P1 SUFFIX

CASE 626

SO–8

D SUFFIX

CASE 751

SOEIAJ–8

M SUFFIX
CASE 968

Drive

Collector

Sense

V

Comparator

Inverting

Input

Representative Schematic Diagram

8

SQ

7

I

pk

Oscillator

6

CC

R

I

pk

C

Comparator

+

-

(Bottom View)

T

Q2

Q1

100

1.25 V

Reference

Regulator

1

Switch
Collector

2

Switch
Emitter

3

Timing
Capacitor

45

Gnd

PIN CONNECTIONS

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

ORDERING INFORMATION

See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.

DEVICE MARKING INFORMATION

See general marking information in the device marking
section on page 11 of this data sheet.

This device contains 51 active transistors.

 Semiconductor Components Industries, LLC, 2000

August, 2000 – Rev. 6

1 Publication Order Number:

MC34063A/D

MC34063A, MC33063A

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V
Comparator Input Voltage Range V
Switch Collector Voltage V
Switch Emitter Voltage (V

= 40 V) V

Pin 1

Switch Collector to Emitter Voltage V
Driver Collector Voltage V
Driver Collector Current (Note 1.) I
Switch Current I
Power Dissipation and Thermal Characteristics

Plastic Package, P, P1 Suffix

TA = 25°C P
Thermal Resistance R

SOIC Package, D Suffix

TA = 25°C P
Thermal Resistance R

Operating Junction Temperature T
Operating Ambient Temperature Range T

MC34063A 0 to +70
MC33063AV –40 to +125
MC33063A –40 to +85

Storage Temperature Range T

1. Maximum package power dissipation limits must be observed.

2. ESD data available upon request.

CC

IR
C(switch)
E(switch)

CE(switch)

C(driver)

C(driver)

SW

D

θ

JA

D

θ

JA
J

A

stg

–0.3 to +40 Vdc

–65 to +150 °C

40 Vdc

40 Vdc
40 Vdc
40 Vdc
40 Vdc

100 mA

1.5 A

1.25 W
100 °C/W

625 W
160 °C/W

+150 °C

°C

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2

MC34063A, MC33063A

ELECTRICAL CHARACTERISTICS (V

= 5.0 V, TA = T

CC

low

to T

[Note 3.], unless otherwise specified.)

high

Characteristics Symbol Min Typ Max Unit

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)

24 33 42 kHz
24 35 42 µA

140 220 260 µA

5.2 6.5 7.5 –

250 300 350 mV

OUTPUT SWITCH (Note 4.)

Saturation Voltage, Darlington Connection

= 1.0 A, Pins 1, 8 connected)

(I

SW

Saturation Voltage (Note 5.)

(I

= 1.0 A, R

SW

= 82 Ω to VCC, Forced β  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

– 1.0 1.3 V

– 0.45 0.7 V

50 75 – –

– 0.01 100 µA

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)

MC33063A, MC34063A
MC33363AV

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 –400 nA

V

mV

TOTAL DEVICE

Supply Current (V

V

> Vth, Pin 2 = Gnd, remaining pins open)

Pin 5

3. T

= 0°C for MC34063A, –40°C for MC33063A, AV T

low

= 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,

CC

= +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV

high

I

CC

– – 4.0 mA

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 (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥ 30 mA), it may take up to 2.0 µs 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  of output switch :

ICoutput

ICdriver – 7.0 mA *

 10

*The 100 Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.

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3

MC34063A, MC33063A

1000

µ

VCC = 5.0 V

500

Pin 7 = V

200

100

50

20

10

5.0

, OUTPUT SWITCH ONOFF TIME ( s)

2.0

on-off

1.0

t

0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10

Figure 1. Output Switch On–Off Time versus

CC

Pin 5 = Gnd
T

= 25°C

A

, OSCILLATOR TIMING CAPACITOR (nF)

C

T

Oscillator Timing Capacitor

t

on

t

off

, OSCILLATOR VOLTAGE (V)

OSC

V

VCC = 5.0 V
Pin 7 = V

CC

Pin 2 = Gnd

Pins 1, 5, 8 = Open
CT = 1.0 nF
T

= 25°C

A

10 µs/DIV

Figure 2. Timing Capacitor Waveform

200 mV/DIV

1.8

1.7

1.6

1.5

1.4

1.3

, SATURATION VOLTAGE (V)

1.2

1.1

CE(sat)

V

1.0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

VCC = 5.0 V
Pins 1, 7, 8 = V
Pins 3, 5 = Gnd
T

= 25°C

A

(See Note 6.)

IE, EMITTER CURRENT (A)

Figure 3. Emitter Follower Configuration Output

Saturation Voltage versus Emitter Current

400

380

VCC = 5.0 V

360

I

= I

chg

340

dischg

320

300

280

260

, CURRENT LIMIT SENSE VOLTAGE (V)

240

220

200

IPK(sense)

-55 -25 0 25 50 75 100 125

V

T

, AMBIENT TEMPERATURE (°C)

A

Figure 5. Current Limit Sense Voltage

versus Temperature

1.1

1.0

0.9

Darlington Connection

0.8

0.7

0.6
VCC = 5.0 V

Pin 7 = V

0.5

0.4

, SATURATION VOLTAGE (V)

CC

0.3

CC

Pins 2, 3, 5 = Gnd
T

= 25°C

A

(See Note 6.)

Forced β = 20

0.2

CE(sat)

0.1

V

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

I

, COLLECTOR CURRENT(A)

C

Figure 4. Common Emitter Configuration Output

Switch Saturation Voltage versus

Collector Current

3.6

3.2

2.8

2.4

2.0

1.6

1.2

, SUPPLY CURRENT (mA)

0.8

CC

I

0.4

0

0 5.0 10 15 20 25 30 35 40

CT = 1.0 nF
Pin 7 = V

CC

Pin 2 = Gnd

VCC, SUPPLY VOLTAGE (V)

Figure 6. Standby Supply Current versus

Supply Voltage

6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

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MC34063A, MC33063A

170 µH

L

8

1

180

SQRQ2

Q1

V

12 V

7

I

R

sc

0.22

in

6

+

100

pk

V

CC

+

Comp.

-

Osc

C

T

1.25 V
Ref

Reg

5

R2

R1 2.2 k

47 k

2

3

C

T

1500

pF

4

330 C

1N5819

+

O

V

out

28 V/175 mA

Test Conditions Results

Line Regulation Vin = 8.0 V to 16 V, IO = 175 mA 30 mV = ±0.05%
Load Regulation Vin = 12 V, IO = 75 mA to 175 mA 10 mV = ±0.017%
Output Ripple Vin = 12 V, IO = 175 mA 400 mVpp
Efficiency Vin = 12 V, IO = 175 mA 87.7%
Output Ripple With Optional Filter Vin = 12 V, IO = 175 mA 40 mVpp

1.0 µH

Optional Filter

V

out

+

100

Figure 7. Step–Up Converter

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5

MC34063A, MC33063A

V

8

7

R

sc

V

in

6

1

2

out

8

7

R

sc

V

in

6

1

2

R

R  0 for
constant V

V

in

Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A

8a. External NPN Switch 8b. External NPN Saturated Switch

(See Note 7.)

7. 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 µs 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

V

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

Q1

1

2

1N5819

3

C

T

470

4

470 C

L

220 µH

pF

V

out

5.0 V/500 mA

1.0 µH

+

O

Test Conditions Results

Line Regulation Vin = 15 V to 25 V, IO = 500 mA 12 mV = ±0.12%
Load Regulation Vin = 25 V, IO = 50 mA to 500 mA 3.0 mV = ±0.03%
Output Ripple Vin = 25 V, IO = 500 mA 120 mVpp
Short Circuit Current Vin = 25 V, RL = 0.1 Ω 1.1 A
Efficiency Vin = 25 V, IO = 500 mA 83.7%
Output Ripple With Optional Filter Vin = 25 V, IO = 500 mA 40 mVpp

+

100

Optional Filter

V

out

Figure 9. Step–Down Converter

8

1

8

7

R

sc

V

in

6

2

V

out

7

R

sc

V

in

6

1

2

Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A

10a. External NPN Switch 10b. External PNP Saturated Switch

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7

MC34063A, MC33063A

4.5 V to 6.0 V

V

8

1

SQRQ2

Q1

R

sc

0.24

in

100

R2 8.2 k

7

I

pk

6

V

CC

Osc

C

T

+

+

Comp.

-

1.25 V
Ref

Reg

5

R1

953

2

88 µH

L

3

+

1500
pF

1N5819

4

1.0 µH

V

out

-12 V/100 mA

1000 µf

C

O

+

Optional Filter

Test Conditions Results

Line Regulation Vin = 4.5 V to 6.0 V, IO = 100 mA 3.0 mV = ±0.012%
Load Regulation Vin = 5.0 V, IO = 10 mA to 100 mA 0.022 V = ±0.09%
Output Ripple Vin = 5.0 V, IO = 100 mA 500 mVpp
Short Circuit Current Vin = 5.0 V, RL = 0.1 Ω 910 mA
Efficiency Vin = 5.0 V, IO = 100 mA 62.2%
Output Ripple With Optional Filter Vin = 5.0 V, IO = 100 mA 70 mVpp

V

out

100

+

Figure 11. Voltage Inverting Converter

8

7

V

in

6

1

8

2

V

out

7

V

in

6

1

V

out

2

Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A

12a. External NPN Switch 12b. External PNP Saturated Switch

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MC34063A, MC33063A

5.45′′

(Top view, copper foil as seen through the board from the component side)

2.500′′

MC34063A

MC34063A

(Top View, Component Side) *Optional Filter.

Figure 13. Printed Circuit Board and Component Layout

(Circuits of Figures 7, 9, 11)

INDUCTOR DATA

Converter Inductance (µH) Turns/Wire

Step–Up 170 38 Turns of #22 AWG
Step–Down 220 48 Turns of #22 AWG
Voltage–Inverting 88 28 Turns of #22 AWG

All inductors are wound on Magnetics Inc. 55117 toroidal core.

MC34063A

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9

MC34063A, MC33063A

)

Calculation

ton/t

off

(ton + t

t

off

t

on

C

T

I

pk(switch)

R

sc

L

(min)

)

off



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 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.

Step–Up Step–Down Voltage–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



t

t

|  1.251 

off

sat

on

 1

)





t

on(max)

R2
R1

(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

)



off

out

t

on(max

)



(V

2I

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



t

off

pk(switch)

)

sat

I

t

on

out

ripple(pp)

F

off

on

 1





t

on(max)

Figure 14. Design Formula Table

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10

MC34063A, MC33063A

ORDERING INFORMATION

Device Package Shipping

MC33063AD SO–8 98 Units / Rail
MC33063ADR2 SO–8 2500 Units / Tape & Reel
MC33063AP1 DIP–8 50 Units / Rail
MC33063AVD SO–8 98 Units / Rail
MC33063AVDR2 SO–8 2500 Units / Tape & Reel
MC33063AVP DIP–8 50 Units / Rail
MC34063AD SO–8 98 Units / Rail
MC34063ADR2 SO–8 2500 Units / Tape & Reel
MC34063AP1 DIP–8 50 Units / Rail
MC34063BD SO–8 98 Units / Rail
MC34063BDR2 SO–8 2500 Units / Tape & Reel
MC34063AM SOEIAJ–8 94 Units / Rail
MC34063AMEL SOEIAJ–8 1000 Units / Tape & Reel
MC34063AML1 SOEIAJ–8 1000 Units / Tape & Reel
MC34063AML2 SOEIAJ–8 2000 Units / Tape & Reel
MC34063AMR1 SOEIAJ–8 1000 Units / Tape & Reel
MC34063AMR2 SOEIAJ–8 2000 Units / Tape & Reel

MARKING DIAGRAMS

PDIP–8

P, P1 SUFFIX

CASE 626

8

3x063AP1

AWL

YYWW

1

PDIP–8

P, P1 SUFFIX

CASE 626

8

33063AVP

AWL

YYWW

1

SO–8

D SUFFIX

CASE 751

8

3x063

ALYWz

1

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

SO–8

D SUFFIX

CASE 751

8

34063

ALYWz

1

SOEIAJ–8
M SUFFIX
CASE 968

8

M063A

ALYW

1

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11

NOTE 2

SEATING

–T–

PLANE

MC34063A, MC33063A

PACKAGE DIMENSIONS

PDIP–8

P, P1 SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE K

58

–B–

1

4

F

–A–

L

C

J

N

D

H

G

0.13 (0.005)

K

M M M

AB

T

M

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.

MILLIMETERS INCHES

MIN MINMAX MAX

DIM

A
B
C
D
F
G
H
J
K
L
M
N

9.40

6.10

3.94

0.38

1.02

2.54 BSC

0.76

0.20

2.92

7.62 BSC



0.76

10.16

6.60

4.45

0.51

1.78

1.27

0.30

3.43

10°

1.01

0.370

0.240

0.155

0.015

0.040

0.100 BSC

0.030

0.008

0.115

0.300 BSC


0.030

0.400

0.260

0.175

0.020

0.070

0.050

0.012

0.135

10°

0.040

C

A

A1

SO–8

D SUFFIX

PLASTIC PACKAGE

CASE 751–06

ISSUE T

D

58

0.25MB

E

1

B

e

H

4

M

h

X 45





C

A

SEATING
PLANE

0.10

L

B

SS

A0.25MCB

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.

MILLIMETERS

DIM MIN MAX

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

3.80 4.00

1.27 BSCe

H 5.80 6.20
h

0.25 0.50

L 0.40 1.25

0 7





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12

58

14

Z

D

e

b

0.13 (0.005)

M

1

A

E

H

A

0.10 (0.004)

MC34063A, MC33063A

SOEIAJ–8

M SUFFIX

PLASTIC PACKAGE

CASE 968–01

ISSUE O

NOTES:

L

E

Q

1

E

°

M

L

DETAIL P

P

c

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).

MILLIMETERS

DIMAMIN MAX MIN MAX

--- 2.05 --- 0.081

A

0.05 0.20 0.002 0.008

1
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

E
L 0.50 0.85 0.020 0.033
L

1.10 1.50 0.043 0.059

E

M 0 10 0 10

°°°°

Q

0.70 0.90 0.028 0.035

1
Z --- 0.94 --- 0.037

INCHES

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13

Notes

MC34063A, MC33063A

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14

Notes

MC34063A, MC33063A

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15

MC34063A, MC33063A

ON Semiconductor and are 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.

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For additional information, please contact your local
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http://onsemi.com

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