UNISONIC MC34063A DATA SHEET

UNISONIC TECHNOLOGIES CO., LTD

MC34063A

LINEAR INTEGRATED CIRCUIT

DC TO DC CONVERTER
CONTROLLER

 DESCRIPTION

The UTC MC34063A is a monolithic regulator subsystem,

intended for use as DC to DC converter. This device contains a
temperature compensated band gap reference, a duty-cycle
control oscillator, driver and high current output switch. It can be
used for step down, step-up or inverting switching regulators as
well as for series pass regulators.

 FEATURES

* Operation from 3.0V to 40V.
* Short circuit current limiting.
* Low standby current.
* Output switch current of 1.5A without external transistors.
* Frequency of operation from 100Hz to 100kHz.
* Step-up, step-down or inverting switch regulators.

Lead-free: MC34063AL
Halogen-free: MC34063AG

 ORDERING INFORMATION

Ordering Number

Normal Lead Free Halogen Free
MC34063A-D08-T MC34063AL-D08-T MC34063AG-D08-T DIP-8 Tube
MC34063A-S08-R MC34063AL-S08-R MC34063AG-S08-R SOP-8 Tape Reel

Package Packing

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MC34063A LINEAR INTEGRATED CIRCUIT

 PIN CONFIGURATION

 PIN DESCRIPTION

PIN NO PIN NAME I/O DESCRIPTION

1 Switch Collector I Internal Darlington pairs TI collector
2 Switch Emitter O Internal Darlington pairs TI emitter
3 Timing Capacitor The value of selected capacitor controls the internal oscillator run rate
4 GND

Comparator Inverting

5

Input

6 VCC

7 I

8 Driver Collector I Internal Darlington pairs TI collector

Sense I

PEAK

Inverting input of comparator which can set & initiate the Darlington pairs

I

output switch

Current sense input to monitor the voltage drop across an external
resistor placed in series with V

CC

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MC34063A LINEAR INTEGRATED CIRCUIT

 BLOCK DIAGRAM

E

Switch Collector

Switch Emitter

Timing Capacitor

GND

S

R

D

Is

COMP.

B

T1

T2

A

1.25VREF

Q

C

CT

OSCILLATOR

1

2

3 6

8

Drive Collector

7

I

PEAK Sense

Vcc

Comparator Inverting

54

Input

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MC34063A LINEAR INTEGRATED CIRCUIT

 ABSOLUTE MAXIMUM RATINGS (Ta=25°C )

PARAMETER SYMBOL RATINGS UNIT
Supply Voltage VCC 40 V
Comparator Input Voltage Range V
Switch Collector Voltage V
Switch Emitter Voltage V
Switch Collector to Emitter Voltage V
Driver Collector Voltage V

IN(COMP)

C(SW)

E(SW)

CE(SW)

40 V

C(DR)

Switch Current ISW 1.5 A

Power Dissipation (Ta=25°C)

DIP-8 1250
SOP-8

PD

Junction Temperature TJ +150 °C
Operating Temperature T
Storage Temperature T

0 ~ +70 °C

OPR

-65 ~ +150 °C

STG

Note: Absolute maximum ratings are those values beyond which the device which the device could be permanently

damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.

 THERMAL DATA

PARAMETER SYMBOL RATINGS UNIT

Junction-to-Ambient

DIP-8 100

SOP-8

θJA

-0.3 ~ +40 V
40 V
40 V
40 V

625

160

mW

℃/W

 ELECTRICAL CHARACTERISTICS (V

=5.0V, Ta=0~+70°C, unless otherwise specified.)

CC

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Oscillator

Charging Current I
Discharging Current I
Oscillator Amplitude V

VCC=5 to 40V, Ta=25°C 22 31 42 μA

CHG

VCC=5 to 40V, Ta=25°C 140 190 260 μA

DISCHG

Ta=25°C 0.5 V

OSC

Discharge to Charge Current Ratio K V7=VCC, Ta=25°C 5.2 6.1 7.5
Current limit Sense Voltage V

SENSE

I

CHG=IDISCHG

, Ta=25°C 250 300 350 mV

Output Switch

Saturation Voltage 1(Note) V
Saturation Voltage 2(Note) V
DC Current Gain(Note) G
Collector Off State Current(Note) I

CE(SAT)1ISW

CE(SAT)2ISW

I (DC)

C(OFF)

=1.0A, V
=1.0A, V

C(DRIVER)=VC(SW)

C(DRIVER)

0.95 1.3 V

=50mA 0.45 0.7 V
ISW=1.0A, VCE=5.0V, Ta=25°C 50 180
VCE=40.0V, Ta=25°C 0.01 100 μA

Comparator

Threshold Voltage V
Threshold Voltage Line Regulation V
Input Bias Current I

1.21 1.24 1.29 V

THD

VCC=3 ~ 40V 2.0 5.0 mV

THD

VIN=0V 50 400 nA

I(BIAS)

Total Device

Supply Current ICC

CC

V

7=VCC

, VC>V

, Pin2=GND

THD

2.7 4.0 mA

V

=5~40V, CT=0.001

Note: Output switch tests are performed under pulsed conditions to minimize power dissipation.

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MC34063A LINEAR INTEGRATED CIRCUIT

 STEP-UP CONVERTER

170μH

L

8

180

SQ

R

Q2

Q1

7

I

IN12V

V

PK

0.22

R

SC

6

V

+

100

CC

+

-

Comp.

C

T

O

SC

1.25V

R

EF REG

5

R

2

2.2kR

1

47k

Test Conditions Results
Line Regulation VIN = 8.0V ~ 16V, I
Load Regulation VIN = 12V, I
Output Ripple VIN = 12V, I
Efficiency VIN = 12V, I
Output Ripple With Optional Filter VIN = 12V, I

= 75mA ~ 175mA 10mV = ±0.017%

OUT

= 175mA 400mVp-p

OUT

= 175mA 87.7%

OUT

= 175mA 40mVp-p

OUT

1

2

1N5819

3

C

T

1500pF

4

1.0μH

V

OUT

28V/175mA

+

330 C

O

Optional Filter

= 175mA 30mV = ±0.05%

OUT

+

100

V

OUT

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MC34063A LINEAR INTEGRATED CIRCUIT

 STEP-DOWN CONVERTER(Cont.)

Test Conditions Results
Line Regulation VIN = 15V ~ 25V, I
Load Regulation VIN = 25V, I
Output Ripple VIN = 25V, I

OUT

OUT

= 500mA 12mV = ±0.12%

OUT

= 50mA ~ 500mA 3.0mV = ±0.03%

= 500mA 120mVp-p
Short Circuit Current VIN = 25V, RL = 0.1Ω 1.1A
Efficiency VIN = 25V, I
Output Ripple With Optional Filter VIN = 25V, I

= 500mA 83.7%

OUT

= 500mA 40mVp-p

OUT

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MC34063A LINEAR INTEGRATED CIRCUIT

 VOLTAGE INVERTING CONVERTER

Test Conditions Results
Line Regulation VIN = 4.5V ~ 6.0V, I
Load Regulation VIN = 5.0V, I
Output Ripple VIN = 5.0V, I
Short Circuit Current VIN = 5.0V, RL = 0.1Ω 910mA
Efficiency VIN = 5.0V, I
Output Ripple With Optional Filter VIN = 5.0V, I

OUT

OUT

OUT

OUT

= 100mA 3.0mV = ±0.012%

OUT

= 10mA ~ 100mA 0.022V = ±0.09%
= 100mA 500mVp-p

= 100mA 62.2%
= 100mA 70mVp-p

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MC34063A LINEAR INTEGRATED CIRCUIT

 EXTERNAL CURRENT BOOST CONNECTIONS FOR IC PEAK GREATER THAN 1.5A

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MC34063A LINEAR INTEGRATED CIRCUIT

 TYPICAL CHARACTERISTICS

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MC34063A LINEAR INTEGRATED CIRCUIT

 DESIGN FORMULA TABLE

CALCULATION STEP-DOWN STEP-UP VOLTAGE-INVERTING

t

ON

t

(tON+t

OFF

OFF)MAX

CT 4x10

I

SW

-5

tON 4x10

OUT(MAX)

2I

-5

tON 4x10

RS 0.3/ISW 0.3/ISW 0.3/ISW

L

(MIN)

CO

V
V

- Saturation voltage of the output switch.

CE(SAT)

- Forward voltage drop of the ringback rectifier.

F

The following power supply characteristics must be chosen:

- Nominal input voltage.

V

IN

V

-

OUT

- Desired output current.

I

OUT

F

- Minimum desired output switching frequency at the selected values for VIN and I

MIN

V

RIPPLE(P-P)

Desired output voltage, V

=1.25(1+R2/R1)

OUT

- Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased
due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept
to a low value since it will directly effect the line and load regulation.

OUT

V

OUT

VIN-V

I

OUT tON

V

RIPPLE(P-P)

.

+ V

CE(SAT)

-5

tON

F

UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated v alues (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.

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