Datasheet MC34063ABN, MC34063ECN Specification

Features

SO-8

DIP-8

MC34063AB, MC34063AC,

MC34063EB, MC34063EC

DC-DC converter control circuits

Datasheet - production data

Description

The MC34063A/E series is a monolithic control
circuit which delivers the main functions for DC­DC voltage converting.

The device contains an internal temperature
compensated reference, comparator, duty cycle
controlled oscillator with an active current limit
circuit, driver and high current output switch.
Output voltage is adjustable through two external
resistors with a 2% reference accuracy.

Employing a minimum number of external
components, the MC34063A/E device series is
designed for step-down, step-up and voltage­inverting applications.

 Output switch current in excess of 1.5 A
 2 % reference accu racy
 Low quiescent current: 2.5 mA (typ.)
 Operating from 3 V to 40 V
 Frequency operatio n to 100 kHz
 Active current limiting

Table 1. Device summary

DIP-8 SO-8

MC34063ABN MC34063ABD-TR
MC34063ACN MC34063ACD-TR
MC34063EBN MC34063EBD-TR
MC34063ECN MC34063ECD-TR

Order codes

April 2013 DocID5257 Rev 11 1/23

This is information on a product in full production.

www.st.com

23

Contents MC34063AB, MC34063AC, MC34063EB, MC34063EC

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Diagram

1 Diagram

Figure 1. Block diagram

DocID5257 Rev 11 3/23

Pin configuration MC34063AB, MC34063AC, MC34063EB, MC34063EC

2 Pin configuration

Figure 2. Pin connections

Table 2. Pin description

Pin n° Symbol Name and function

1 SWC Switch collector
2 SWE Switch emitter
3 TC Timing capacitor
4 GND Ground
5 CII Comparator inverting input
6V
7I
8 DRC Voltage driver collector

CC

PK

Voltage supply
IPK sense

4/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V
V

V

V

SWC
SWE

V
V

I
I

Power supply voltage 50 V

CC

Comparator input voltage range -0.3 to 40 V

IR

Switch collector voltage 40 V
Switch emitter voltage (V
Switch collector to emitter voltage 40 V

CE

Driver collector voltage 40 V

DC

Driver collector current 100 mA

DC

Switch current 1.5 A

SW

= 40V) 40 V

SWC

for DIP-8 1.25

P

T

T

Power dissipation at TA = 25°C

TOT

Operating junction temperature 150 °C

T

J

Storage temperature range -40 to 150 °C

STG

Operating ambient temperature

OP

range

for SO-8 0.625

for AC and EC
series

0 to 70

for AB series -40 to 85

W

°C

for EB series -40 to 125

Note: Absolute maximum ratings are those values beyond which d amage to the device may occur .

Functional operation under these condition is not implied.

Table 4. Thermal data

Symbol Parameter DIP-8 SO-8 Unit

R

thJA

R

thJC

1. This value depends from thermal design of PCB on which the device is mounted.

Thermal resistance junction-ambient
Thermal resistance junction-case 42 20 °C/W

DocID5257 Rev 11 5/23

(1)

100 160 °C/W

Electrical characteristics MC34063AB, MC34063AC, MC34063EB, MC34063EC

4 Electrical characteristics

Refer to the test circuits , V

= 5 V, TA = T

CC

LOW

to T

, unless otherwise specified.

HIGH

(a)

Table 5. Oscillator

Symbol Parameter T est conditions Min. T yp. Max. Unit

f

OSC

I

CHG

I

DISCHG

I

DISCHG/ICHG

V

IPK(sense)

Frequency V
Charge current V
Discharge current V
Discharge to charge

current ratio
Current limit sense voltage I

= 0V, CT = 1 nF, TA = 25°C 24 33 42 kHz

PIN5

= 5 to 40V, TA = 25°C 24 33 42 µA

CC

= 5 to 40V, TA = 25°C 140 200 260 µA

CC

PIN 7 = V

= I

CHG

, TA = 25°C 5.2 6.2 7.5 µA

CC

DISCHG, TA

= 25°C 250 300 350 mV

Table 6. Output switch

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

CE(sat)

V

CE(sat)

h

I

C(off)

Saturation voltage, Darlington
connection

Saturation voltage

DC current gain ISW = 1 A,V

FE

Collector off-state curre nt V

= 1 A, PIN 1, 8 connected 1 1.3 V

I

SW

= 1 A, R

I

SW

Forced  ~ 20

= 40 V 0.01 100 µA

CE

= 82  to V

PIN8

= 5 V, TA = 25°C 50 120

CE

CC

0.45 0.7 V

Table 7. Comparator

Symbol Parameter Test conditions Min. Typ. Max. Unit

T

= 25°C 1.225 1.25 1.275

V

Reg

I

Threshold voltage

TH

Threshold voltage line

line

regulation
Input bias current V

IB

a. T

= 0 °C, T

LOW

T

= 125 °C (EB series)

HIGH

= 70 °C (AC and EC series); T

HIGH

6/23 DocID5257 Rev 11

A

= T

T

A

V

CC

IN

to T

LOW

HIGH

= 3 to 40 V 1 5 mV

= 0 V -5 -400 n A

= -40 °C, T

LOW

1.21 1.29

= 85 °C (AB series); T

HIGH

LOW

= -40 °C,

V

MC34063AB, MC34063AC, MC34063EB, MC34063EC Electrical characteristics

T able 8. Total device

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

= 5 to 40 V

CC

for MC34063A 2.5 4
CT = 1 nF
PIN 7 = V

I

CC

Supply current

V

PIN5

PIN 2 = GND

>V

TH

CC

mA

1.5 4for MC34063E

Remaining pins
open

V

START-UP

1. Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work.

Start-up voltage

(1)

TA = 25°C

= 1 µF, PIN 5 = 0

C

T

for MC34063A 2.1

V

for MC34063E 1.5

Note: Maximum package power dissipation limit must be observed.

If Darlington configuration is not used, care must be taken to a void deep saturation o f output
switch. The resulting switch-off time may be adversely affected. In a Darlington
configuration the following output driver condition is suggested:
Forced

 of output current switch = I

COUTPUT

/(I

CDRIVER

- 1 mA)  10

DocID5257 Rev 11 7/23

Typical performance characteristics MC34063AB, MC34063AC, MC34063EB, MC34063EC

5 Typical performance characteristics

Figure 3. Emitter follower configuration output

saturation voltage vs. emitter current

Figure 5. Common emitter configuration output

switch saturation voltage vs. collector current

Figure 4. Output switch ON-OFF time vs.

oscillator timing capacitor

Figure 6. Darlington configuration collector

emitter saturation voltage (V

CEsat

) vs.

temperature

8/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical performance characteristics

Figure 7. Power collector emitter saturation

voltage (V

Figure 9. Reference voltage vs. temperature Figure 10. Bias current vs. temperature

) vs. temperature

CEsat

Figure 8. Current limit sense voltage (V

temperature

IPK

) vs.

Figure 11. Supply current vs. temperature Figure 12. Supply current vs. input voltage

DocID5257 Rev 11 9/23

Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC

PIN 1 = V

OUT

PIN 2 = GND
PIN 3 = GND
PIN 4 = V

IN

6 Typical application circuit

Figure 13. Step-up converter

Figure 14. Printed evaluation board

Table 9. Test condition (V

Test Conditions Value (Typ.) Unit

Line Regulation V
Load Regulation V
Output Ripple V
Efficiency V

10/23 DocID5257 Rev 11

= 8 to 16 V, IO = 175 mA 30 mV

IN

= 12 V, IO = 75 to 175 mA 10 mV

IN

= 12 V, IO = 175 mA 300 mV

IN

= 12 V, IO = 175 mA 89 %

IN

= 28 V)

OUT

MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit

PIN 1 = V

OUT

PIN 2 = GND
PIN 3 = GND

PIN 4 = V

IN

Figure 15. Step-down converter

Figure 16. Printed evaluation board

Test Conditions Value (typ.) Unit

Line regulation V
Load regulation V
Output ripple V
Efficiency V
I

SC

Table 10. Test condition (V

= 15 to 25 V, IO = 500 mA 5 mV

IN

= 25 V, IO = 50 to 500 mA 30 mV

IN

= 25 V, IO = 500 mA 100 mV

IN

= 25 V, IO = 500 mA 80 %

IN

V

= 25 V, R

IN

= 0.1  1.2 A

LOAD

DocID5257 Rev 11 11/23

= 5 V)

OUT

Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC

PIN 1 = V

OUT

PIN 2 = GND
PIN 3 = GND

PIN 4 = V

IN

Figure 17. Voltage inverting converter

Figure 18. Printed evaluation board

Table 11. Test condition (V

Test Conditions Value (typ.) Unit

Line regulation V
Load regulation V
Output ripple V
Efficiency V
I

SC

12/23 DocID5257 Rev 11

= 4.5 to 6 V, IO = 100 mA 15 mV

IN

= 5 V, IO = 10 to 100 mA 20 mV

IN

= 5 V, IO = 100 mA 230 mV

IN

= 5 V, IO = 100 mA 58 %

IN

V

= 5 V, R

IN

= 0.1  0.9 A

LOAD

= 12 V)

OUT

MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit

V

OUTVFVIN min

–+

V

IN minVsat

–

-------------------------------------------------------

V

OUTVF

+

V

IN minVsat

– V

OUT

–

-----------------------------------------------------------

V

OUTVF

+

V

INVsat

–

------------------------------ -

I

outton

V

ripple p p–

------------------------------ -

I

PK switchtontoff

+

8V

ripple p p–

----------------------------------------------------- -

I

outton

V

ripple p p–

------------------------------ -

V

IN minVsat

–

I

PK switch

-------------------------------------- t

on min



IN minVsat

– V

out

–

I

PK switch

on min



V

IN minVsat

–

I

PK switch

-------------------------------------- t

on min



Table 12. Calculation

Parameter

t

on/toff

(ton + t
C

T

I

PK(switch)

R

SC

C

O

(Discontinuous mode)

) max 1/f

off

2I

out(max)

0.3/I

Step-Up

min

4.5x10-5t
[(ton/t

PK(switch)

(Continuous mode)

on

)+1] 2I

off

Step-Down

1/f

min

4.5x10-5t

out(max)

0.3/I

PK(switch)

on

Vo ltage Inverting

(Discontinuous mode)

1/f

min

2I

out(max)

4.5x10-5t

0.3/I

on

[(ton/t

off

PK(switch)

)+1]

L

(min)

Note: 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

V

= Desired output voltage, |V

OUT

I

= Desired output current

OUT

f

= Minimum desired output switching frequency at the selected values of VIN and I

MIN

V

= Desired peak to peak output ripple voltage. In practice, the calculated capacitor

RIPPLE

| = 1.25 (1 + R2/R1)

OUT

O

value will and 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.

DocID5257 Rev 11 13/23

Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC

Figure 19. Step-up with external NPN switch

Figure 20. Step-down with external NPN switch

14/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit

Figure 21. Step-down with external PNP switch

Figure 22. Voltage inverting with external NPN switch

DocID5257 Rev 11 15/23

Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC

Figure 23. Voltage inverting with external PNP saturated switch

Figure 24. Dual output voltage

16/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit

Figure 25. Higher output power, higher input voltage

DocID5257 Rev 11 17/23

Package mechanical data MC34063AB, MC34063AC, MC34063EB, MC34063EC

7 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

18/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Package mechanical data

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 3.3 0.130

a1 0.7 0.028

B 1.39 1.65 0.055 0.065

B1 0.91 1.04 0.036 0.041

b 0.5 0.020

b1 0.38 0.5 0.015 0.020

D 9.8 0.386

E 8.8 0.346

e 2.54 0.100

e3 7.62 0.300

e4 7.62 0.300

F 7.1 0.280

I 4.8 0.189

L 3.3 0.130

Z 0.44 1.6 0.017 0.063

Plastic DIP-8 mechanical data

P001F

DocID5257 Rev 11 19/23

Package mechanical data MC34063AB, MC34063AC, MC34063EB, MC34063EC

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 1.35 1.75 0.053 0.069

A1 0.10 0.25 0.04 0.010

A2 1.10 1.65 0.043 0.065

B 0.33 0.51 0.013 0.020

C 0.19 0.25 0.007 0.010

D 4.80 5.00 0.189 0.197

E 3.80 4.00 0.150 0.157

e 1.27 0.050

H 5.80 6.20 0.228 0.244

h 0.25 0.50 0.010 0.020

L 0.40 1.27 0.016 0.050

k8° (max.)

ddd 0.1 0.04

SO-8 mechanical data

0016023/C

20/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC Package mechanical data

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 330 12.992

C 12.8 13.2 0.504 0.519

D 20.2 0.795

N 60 2.362

T 22.4 0.882

Ao 8.1 8.5 0.319 0.335

Bo 5.5 5.9 0.216 0.232

Ko 2.1 2.3 0.082 0.090

Po 3.9 4.1 0.153 0.161

P 7.9 8.1 0.311 0.319

Tape & reel SO-8 mechanical data

DocID5257 Rev 11 21/23

Revision history MC34063AB, MC34063AC, MC34063EB, MC34063EC

8 Revision history

Table 13. Document revision history

Date Revision Changes

20-Nov-2007 10 Added Table 1.

24-Apr-2013 11 Removed note Table 1 on page 1.

22/23 DocID5257 Rev 11

MC34063AB, MC34063AC, MC34063EB, MC34063EC

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DocID5257 Rev 11 23/23