MC34063AD - Motorola / Freescale Semiconductor

Advance Information

DC-TO-DC CONVERTER

CONTROL CIRCUITS

The MC34063A Series is amonolithic control circuit containing

the primary functions required for DC-to-DC converters. These

devices consist of an internal temperature compensated refer-

ence, 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 aminimum

number of external components. Refer to Application Notes

AN920A and AN954 for additional design information.

●Operation from 3.0 Vto 40 VInput

●Low Standby Current

●Current Limiting

●Output Switch Current to 1.5 A~J.”

,,::*.’-.,*..,

,..$.,<

●Output Voltage Adjustable .,,,.<.’e.-*b, ??

,,!I\!N

.Frequency Operation to

●Precision 20/0Reference

100 kHz

I I

I1.25 V

Reference I

IRegulator I

Comparator 5~I/4

Inverting o[I

Collector

Switch

Emitter

Tming

Capacitor

Gnd

Input I

L______ – _______________

This document contains information on anew product. Specifications and information herein are

subject to change without notice.

Order this data sheet by MC34063ND

IMC34063A

MC35063A

MC33063A

SILICON MONQ@$@>

,..

*.,,,..,:>

... DSUFFIX

PLASTICPACWGE 8

CASE751-03 e1

(S0-8)

USUFFIX

CERAMIC PACWGE 8

CASE693-02 1

PIN CONNECTIONS

Switch

Driver

Collector ‘8Collector

Switch

Emitter 27Ipk sense

Tming 3

Capacitor D

6Vcc

‘ndu

(ToP View)

Comparator

Inverting

Input

ORDERING INFORMATION

I\Temperature II

m‘to+700cm

OMOTOROU INC., 1989 ADI1431

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage Vcc 40 Vdc

Comparator Input Voltage Range VIR –0.3 to +40 Vdc

Switch Collector Voltage vc(~witch) 40 Vdc

Switch Emitter Voltage (Vpin 1=40 V) VE(~witch) 40 Vdc

Switch Collector to Emitter Voltage VCE(~witch) 40 Vdc

Driver Collector Voltage Vc(driver) 40 Vdc

Driver Collector Current (Note 1)Ic(driver) 100 mA

Switch Current Isw 1.5 Amps

Power Dissipation and Thermal Characteristics ..:

Ceramic Package, USuffix ,,.~~..

v.>

Y.,

TA = + 25°C pD 1.25

Thermal Resistance R8JA 100 ,, ,,$&

Plastic Package, PSuffix ~~.~~>

TA = + 25°C pD 1.25 .:.’ ~?.

$>,~.~.,.,$ w

$,\ $ 0

Thermal Resistance ReJA 10Q,.,..,’!~%L’”M

:CN

SOIC Package, DSuffix “~}l;;.-+?>i)$

~,..\\

TA = + 25°C pD ,+;%5 *mw

Thermal Resistance ReJA ,.,,..p:$bw ‘cm

Operating Junction Temperature \t:>

TJ ‘.%“

$?,~{.,,:C+I50 ‘c

Operating Ambient Temperature Range :~‘“>:‘~..v~

TA ~$“c

MC35063A ... ......

,!i~:. –55to +125

MC33063A .!~...~:f,,.,

*,.. –40to +85

MC34063A ,,,?.s’s<,:$,,

.\ ,,~, Oto +70

!>:

:$, ‘a. .>? “-, ,.- A.A

Storage Temperature Hange l.,%&~~fg

,,.,,,,,.> –0010 +Iou I-L

..,. “..,<,,..

ELECTRICAL CHARACTERISTICS (VCC =5.0 V; TA =TIOW$O Thigh [Note 21 unless otherwise specified)

.,>:..

Characteristic ,*4* kSymbol Min Typ Max Units

OSCILLATOR I

.,,~.>:>.’.<r,t>t$.

Frequency .,*:,, ~

,1:,’1 fosc 24

*~~2\33 42 kHz

(Vpin 5=OV, CT =1.0 nF, TA =25°c) ,8,,,*i;FJ”.Y

Charge Current ~!$.>;>i?

,:~$~t+t>,,,,J> Ichg 24 33 42 PA

(VCC =5.0 Vto 40 V, TA =25°C) :~ t<~’:

Discharge Current Idischg 140 200 260 pA

Discharge to Charge Curren$~a~~ Idischgllchg 5.2 6.2 7.5 —

(pin 7=Vcc, TA =2@&~&7,$F

Current Limit Sense VoF’ ,~~:

g,,>

\~pk(sense) 250 300 350 mV

(Ich =ldischg,.?~~.= 2C)

*. $s:, ~>&

NOTES: -~t$j$ks~“

1, Maximum pa@,k>@wer dissipation limits must be observed.

2, TIOW =–~;~{~r M~35063A Thigh = + 125°C for MC35063A

w,4Q~,@P MC33063A +85°C for MC33063A

:w:’’$j~C%?or MC34063A +70°C for MC34063A

.~f \*.

*. ,,,.

@MOTOROLA Semiconductor Products

2Inc.

ELECTRICAL CHARACTERISTICS —continued (VCC =5.0 V; TA =Tlow to Thigh unless otherwise specified)

Chara@aristic Symbol Min Typ Max Units I

OUTPUT SWITCH (Note 3)

Saturation Voltage, Darlington Connection

(Isw =1.0A, Pins 1, 8connected) vCE(~at) —1.0 1.3 v

Saturation Voltage vCE(sat) —0.45 0.7

(Isw =1.0A, R~n 8=82 Qto Vcc, Forced ~ = 20)

DC Current Gain hFE 50

(Isw =1.0A, VCE =5.0 V, TA =2WC)

Coi Iector Off-State Current Ic(off) —0.01

(vcE =40 V) .+’

COMPARATOR “ “ .,\,\

‘.$i),>~:

~.,t,$*P ~,k;s,<jt~

Threshold Voltage ;.:1 ~:,

vth ‘~\,\i\\,~t.h~

. . v

(TA =2WC) 1.225 ~j:h ‘? 1.275

(TA =TIOW to Thigh) 1.21 ‘:<t.~tv,

#,,, *,tt ,,,,., 1.29

Threshold Voltage Line Regulation Regline ,VJ+..,.~..>>:.)>,.

—!.>:,.:. ,x\:,

?.4 5.0 mV

(Vcc =3.0 vto 40 v) .s.,.,

ta>,.z,!,:~$.>

,.. ;.,,>

Input Bias Current

(Vin =OV) IIB ,,, ~~:$ – 40 – 400 nA

‘.*~,~-. ..

.,f$f!,(44

M“

TOTAL DEVICE ~,.!!\,,--.?u

~kti’~t:$:~=.>’.$]::,,

Supply Current *

,,jke$’?,,:$ –2.5 40 mA

(Vcc =5.0 Vto 40 V, CT =1.0 nF, Pin 7=Vcc, ,\.p

~:.~::~.,

V~n 5> Vth, Pin 2=Grid, Remaining pins open) .> .!,\>

~.>

.:.,,

NOES: ....:,?,,

.!;:+$$, .,,

3. Low duty cycle pulse techniques are used during test to maintain junction tem~rat~p as close to ambient temperature as possible,

4. If the output switch is driven into hard saturation (non-Darlington configurati~~~~@W switch currents (<300 mA) and high driver currents

(-30 mA), it may take up to 2.0 ps to come out of saturation. This conditio~b~+~~horten the “off time at frequencies >30 kHz, and is magnified

at high temperatures. This condition does not occur with aDarlington conflg~aflon, since the output switch cannot saturate. If anon-Darlington

configuration is used, the following output drive condition is recommend$,d: ‘

Forced pof output switch =Ic, outputi(lc, driver –7.0 mA*) #$&,:,

$]. .~~,:.,

*The 100 Qresistor in the emitter of the driver device require,: @~:~..O mA before the output switch conducts.

@MOTOROLA Semiconductor Products Inc.

FIGURE 1—OUTPUT SWITCH ON-OFF TIME versus

OSCILLATOR TIMING CAPACITOR FIGURE 2—TIMING CAPACITOR WAVEFORM

-1,01 IIII111111 IIII[11111 1I I IIL

0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0

CT, OSCILLATOR TIMING CAPACITOR (nF) I

FIGURE 3—EMITTER FOLLOWER CONFIGURATION OUTPUT

SATURATION VOLTAGE versus EMITTER CURRENT

FIGURE 5-$@URti~T LIMIT SENSE VOLTAGE

~$;@&s TEMPERATURE

TA, AMBIENT TEMPERATURE PC]

mMOTOROLA

Ic, COLLECTOR CURRENT (A)

FIGURE 6—STANDBY SUPPLY CURRENT versus

SUPPLY VOLTAGE

3.2 .

2,a

z2,4 /

z2.0

~1,6

&1.2

2CT=l.OnF

_~ o.a-Rn 7=VCC

0.4 Pin 2=Gnd

o-05.0 10 15 20 25 30 35 40

Semiconductor

Vcc, SUPPLY VOLTAGE (V)

Products Inc.

FIGURE 7—STEP-UP CONVERTER

170 UH

~––––– ——— —- —- —— -- 7

R[ 1,

II ~

Ipk CT 1’

Osc I

Vcc I~

r=~o Vout

T100

Line Regulation ~n =8.0 Vto ~&V, 10 =175 mA 30 mv =f0.05~0

FIGURE* M:#iTERNAL CURRENT BOOST cONNEcTIONS

‘“<:”:~s@OR Ic PEAK GREATER THAN 1.5A

,.:$i

oIII

IrQ

L————————————-—-—— 1

@MOTOROLA

8B —EXTERNAL NPN SATURATED SWITCH

(REFERTO NOTE 4)

~–––-- _——_—_—————

81 11 vou~

4—1I()

1°

71 12

I)I

Rsc I

61 IR+ Ofor

y“ o0constant ~n.

L--————————————— d

Semiconductor Products Inc.

FIGURE 9—STEP-DOWN CONVERTER

I~--––-— -------———— -——- 1I

{)

Ipk I

RSC CT .I

0.33 Osc I1N5:19

Vi”

25 V+

1.25 V:IL

Ref I

Reg 470

IIpF

51 14

I1rI

II‘&

L–––––––––– –––––––––__A

3.6 k

R1 1.2k 470:

Test Results

Line Regulation ~n =1st~~~}~~, 10 =500 mA 12 mV =*0.12Y0

... ,...

Load Regulation Vin =25 @,:JO = 50 to 500 mA 3.0 Mv =*0.03~0

Output Ripple ~j$ =f5 V, 10 =500 mA 120 mVp-p

Short Circuit Current ‘(>~n~~ 25 V, RL =0.1 Q1.1 A

Eticiency -“:<*}*% =25 V, 10 =500 mA 82.57.

.,:~’

Output Ripple With Optional F,~~w{,#’ “Vin =25 V, 10 =500 mA 40 mVp-p

*,. ‘,.~..,$:f.~,,,\~“

,,!,,,$.,,,,..$

..,.~;,\.+:.t:*;,~’

>:$>

-.>.,.

Fl~@~$16 —EXTERNAL CURRENT BOOST CONNECTIONS

~:.~w *,~*/*

&,., FOR Ic PEAK GREATER THAN 1.5A

L—— ——— ——— ——— ——--— —-- A

mMOTOROLA

10B —EXTERNAL PNP SATURATED SWITCH

~----- —------------- 1

8iI

L–--–—––––––———-———— A

Semiconductor Products Inc.

FIGURE 14 —DESIGN FORMULA TABLE

Calculation Step-Up Step-Down Voltage-lnvertin~

ton/toff vout+vF–vin(min) vout+vF lv~utl+VF >‘:$

,..,,.>..

Vin(~i”) ‘V~~t ~~:!j~y...~,k,\:>.

Vin(~i”)–V~at–V~ut Vi~ –V~~t ,It$t,s.t$>..

(tOn+tOff) max ,:,,,..$l

.’,. ...~.f$

*:.

llfmi” l/fmin Ilfmin <$].*::<,.>./.:$.’

CT 4.8x 10–5 ton 4.8 X10–5 ton 4.8 x 10– 5 $;;\$~$

lpk(~witch) 2iout(max)(ton/toff +I)210ut(max) 21~ut(m&:~(#~~WOfi+ 1)

RSC 0.3/lpk(~~it~h) 0.3/lPk(~~it~h) o.3/l~~~&;)

L(min) (Vin(min)–Vsat)tOn(max~ ,,.:,, ..

(Vin(min) –Vsat– VOut)tOn(max} ,(~~n(J$~~LVsat)tOn(max~

lpk(swit~h) lpk(swit~h) m~~wit~h)

co =‘outton~ripple( p-p) lDk(switch)(ton +toff) .?.

‘?‘“~ louttonNripple( p-p)

8VriPPle(P-P) ,t:>+@

49,‘~:s’,,.“f

V~at =Saturation voltage of the output switch. .‘+ “~+

,~i.s,i.s:i::sli<iy:k.

VF =Forward voltage drop of the output rectifier. ‘-.’$,

,,.,.,<~+..

,>?:{;*>,t.:,.R.\

The following power supply charaderistics must be chosen: ,,..$>+,.\a<&

.,,.,.

~n —Nominal input voltage. \ .,. .*,

;$ ,,.,,

,:L~.,,.?

Vout —Desired output voltage, lVoutl =1.25 (1 +R2/Rl )-~~>i.~,,.,!}

~..~}::~

,,\a‘\:-

Iout —Desired output current. ....!.

,.> .’~:k,

fmin —Minimum desired output switching frequency at th~~$~$~cted values of Vin and 10.

VriPPie(P.P) —Desired peak-to-peak output ripple voltag@Yt~i$practice, the calculated capacitor value will need to

be increased due to its equivalent seri~,-~ance and board layout. The ripple voltage should be

kept to alow value since it will directf~~kct the line and load regulation.

.}.,.

MOTOROLA Semiconductor Products Inc.

FIGURE 13 —PRINTED CIRCUIT BOARD AND COMPONENT MYOUT

(CIRCUITS OF FIGURES 7,9, 11)

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

*Optional Filter.

‘;~), ,’~.+,,,u

~::\*

yConverter Indutiance (pH) Turns~re

Step-Up 170 38 Turns of #22 AWG

Step-Down 220 48 Turns of #22 AWG

IVoltage-Inverting I88 I28 Turns of #22 AWG I

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

MOTOROLA Semiconductor Products

8Inc.

FIGURE 11— VOLTAGE INVERTING CONVERTER

1!~–---– -d

——-——————————

*I ‘1

[pk CT

Osc 1=

m“

R- .,,$,,

,~:: <>}?{>]

Test Condi,#o~ ?’- Results

Line Regulation Vin =4.5 Vt~~~~~f~ =100 mA 3.0 mV =*0.012Y0

Load Regulation Vin =5.0 V, 10J~”10 to 100 mA 0.022 v = to.09Y0

Output Ripple Vin =.@.OV,~O =100 mA 500 mVp-p

Short Circuit Current Vin{~ ‘&)QV, RL =0.1 Q910 mA

Eticiency ,,>fl@,~~.O v, 10 =100 mA 64.570

Output Ripple With Optional Filter .$${i~~:

:#$ip’~ 5,0 V, 10 =100 mA 70 mVp-p

.:., ‘“*;

.?~+,.,.-,

S!*.,-h!,>~\ *J

~!:.:~.,’,

,$i .$%,,,..,+

FIGU~,J&/&EXTERNAL CURRENT BOOST CONNECTIONS

,~::,!:t,~+l$t*,x,><\!:

FOR tc PEAK GREATER THAN 1.5A

..8 ,.,.

~I1

>————————— ——— —— —-J

mMOTOROLA

12B —EXTERNAL PNP SATURATED SWITCH

~––––– —————-— --- 1

81 Vo”t

I1°

III ~

I1=

L–––__– __________ J

Semiconductor Products Inc.

-. .. . .. .. . .. .. . .------

UUTLINt DIMtNSIUNS

NOTES:

1.LEADPOSITIONALTOLERANCE:

+14 o.1310005)@lTl A@lo@l

2.DIMENSIONLTO CENTEROF LEAOSWHEN FORMED

PARALLEL,

3.PAC~GE CONTOUR OPTIONALIROUNDOR SOUARE

CORNERS),

4.DIMENSIONSA AND B ARE DATUMS.

5.DIMENSIONINGAND TOLERANCINGPERANSI

Y14.5M,1982.

P1 SUFFIX

PLASTIC DUAL-IN-LINE PACWGE

CASE 626-05

ROJA =100°C#

Motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Motorola

does not assume any Iiabilitv arising out of the application or use of anv product or circuit described herein; neither does it convev any license

under its patent rights nor the rights of others. Motorola products are not authorized for use as components in life support devices or systems

intended for surgical implant into the bodv or intended to support or sustain life. Buyer agrees to notify Motorola of anv such intended end use

whereupon Motorola shall determine availability and suitability of its product or products for the use intended. Motorola and @are registered

trademarks of Motorola, Inc. Motorola, Inc. is an Equal Employment Opportunity/Affirmative Action Employer.

—mMOTOROLA Semiconductor Products Inc.

BOX 20912 ●PHOENIX, ARIZONA 85036 ●ASUBSIDIARY OF MOTOROLA INC. —