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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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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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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