MC34063AMG - ON Semiconductor

August, 2010 − Rev. 23

1Publication Order Number:

MC34063A/D

MC34063A, MC33063A,

SC34063A, SC33063A,

NCV33063A

1.5 A, Step-Up/Down/

Inverting Switching

Regulators

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.

Features

•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

•Pb−Free Packages are Available

Figure 1. Representative Schematic Diagram

100

Ipk

Oscillator CT

Comparator

1.25 V

Reference

Regulator

Drive

Collector

Ipk

Sense

VCC

Comparator

Inverting

Input

Switch

Collector

Switch

Emitter

Timing

Capacitor

GND

(Bottom View)

This device contains 79 active transistors.

SOIC−8

D SUFFIX

CASE 751

PDIP−8

P, P1 SUFFIX

CASE 626

See detailed ordering and shipping information in the package

dimensions section on page 12 of this data sheet.

ORDERING INFORMATION

http://onsemi.com

x = 3 or 4

A = Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G= Pb−Free Package

3x063AP1

AWL

YYWWG

33063AVP

AWL

YYWWG

MARKING

DIAGRAMS

3x063

ALYWA

3x063V

ALYWA

DFN8

CASE 488AF

33063

ALYWA

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

Switch

Collector

Switch

Emitter

Timing

Capacitor

GND

Driver

Collector

Ipk Sense

VCC

Comparator

Inverting

Input

(Top View)

Figure 2. Pin Connections

ÇÇ

(Top View)

EP Flag

Switch Collector

Switch Emitter

Timing Capacitor

GND

Ipk Sense

Driver Collector

Comparator

Inverting Input

VCC

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(switch) 40 Vdc

Switch Emitter Voltage (VPin 1 = 40 V) VE(switch) 40 Vdc

Switch Collector to Emitter Voltage VCE(switch) 40 Vdc

Driver Collector Voltage VC(driver) 40 Vdc

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

Switch Current ISW 1.5 A

Power Dissipation and Thermal Characteristics

Plastic Package, P, P1 Suffix

TA = 25°C PD1.25 W

Thermal Resistance RqJA 115 °C/W

SOIC Package, D Suffix

TA = 25°C PD625 mW

Thermal Resistance RqJA 160 °C/W

DFN Package

TA = 25°C PD1.25 mW

Thermal Resistance RqJA 80 °C/W

Operating Junction Temperature TJ+150 °C

Operating Ambient Temperature Range TA°C

MC34063A, SC34063A 0 to +70

MC33063AV, NCV33063A −40 to +125

MC33063A, SC33063A −40 to + 85

Storage Temperature Range Tstg −65 to +150 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. Maximum package power dissipation limits must be observed.

2. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per MIL−STD−883, Method 3015.

Machine Model Method 400 V.

3. NCV prefix is for automotive and other applications requiring site and change control.

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 4], unless otherwise specified.)

Characteristics Symbol Min Typ Max Unit

OSCILLATOR

Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) fosc 24 33 42 kHz

Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Ichg 24 35 42 mA

Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) Idischg 140 220 260 mA

Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C) Idischg/Ichg 5.2 6.5 7.5 −

Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) Vipk(sense) 250 300 350 mV

OUTPUT SWITCH (Note 5)

Saturation Voltage, Darlington Connection

SW = 1.0 A, Pins 1, 8 connected)

VCE(sat) −1.0 1.3 V

Saturation Voltage (Note 6)

(ISW = 1.0 A, RPin 8 = 82 W to VCC, Forced b ] 20)

VCE(sat) −0.45 0.7 V

DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) hFE 50 75 − −

Collector Off−State Current (VCE = 40 V) IC(off) −0.01 100 mA

COMPARATOR

Threshold Voltage

TA = 25°C

TA = Tlow to Thigh

Vth

1.225

1.21

1.25

−

1.275

1.29

Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)

MC33063, MC34063

MC33063V, NCV33063

Regline

−

1.4

5.0

6.0

Input Bias Current (Vin = 0 V) IIB − −20 −400 nA

TOTAL DEVICE

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

VPin 5 > Vth, Pin 2 = GND, remaining pins open)

ICC − − 4.0 mA

4. Tlow = 0°C for MC34063, SC34063; −40°C for MC33063, SC33063, MC33063V, NCV33063

Thigh = +70°C for MC34063, SC34063; +85°C for MC33063, SC33063; +125°C for MC33063V, NCV33063

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

6. 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 ms 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 bof output switch : ICoutput

ICdriver – 7.0 mA * w10

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

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

100

120

140

160

180

Figure 3. Oscillator Frequency

VCC = 5.0 V, Pin 7 = VCC

Pin 5 = GND, TA = 25°C

Ct, TIMING CAPACITOR CAPACITANCE (nF)

OFF TIME (ms)

ON TIME (ms), FREQUENCY (kHz)

ON TIME (ms)

OFF TIME (ms)

FREQUENCY (kHz)

VCC = 5.0 V

Pin 7 = VCC

Pin 2 = GND

Pins 1, 5, 8 = Open

CT = 1.0 nF

TA = 25°C

Figure 4. Timing Capacitor Waveform

10 ms/DIV

, OSCILLATOR VOLTAGE (V)

OSC

200 mV/DIV

Figure 5. Emitter Follower Configuration Output

Saturation Voltage versus Emitter Current

Figure 6. Common Emitter Configuration Output

Switch Saturation Voltage versus

Collector Current

Figure 7. Current Limit Sense Voltage

versus Temperature

Figure 8. Standby Supply Current versus

Supply Voltage

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

, SATURATION VOLTAGE (V)

CE(sat)

IE, EMITTER CURRENT (A)

VCC = 5.0 V

Pins 1, 7, 8 = VCC

Pins 3, 5 = GND

TA = 25°C

(See Note 7)

, SATURATION VOLTAGE (V)

CE(sat)

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

IC, COLLECTOR CURRENT(A)

Darlington Connection

Forced b = 20

-55 -25 0 25 50 75 100 125

, CURRENT LIMIT SENSE VOLTAGE (V)

IPK(sense)

TA, AMBIENT TEMPERATURE (°C)

VCC = 5.0 V

Ichg = Idischg

0 5.0 10 15 20 25 30 35 40

, SUPPLY CURRENT (mA)

VCC, SUPPLY VOLTAGE (V)

CT = 1.0 nF

Pin 7 = VCC

Pin 2 = GND

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

1.1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

400

380

360

340

320

300

280

260

240

220

200

3.6

3.2

2.4

2.0

1.6

1.2

0.8

0.4

1.0

2.8

VCC = 5.0 V

Pin 7 = VCC

Pins 2, 3, 5 = GND

TA = 25°C

(See Note 7)

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

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

170 mH

180

Rsc

0.22

Vin

12 V

100

R1 2.2 k

47 k

Ipk

OSC

VCC

-Comp.

1.25 V

Ref

Reg

1N5819

1500

330 CO

Vout

28 V/175 mA Vout

1.0 mH

+100

Optional Filter

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

Figure 9. Step−Up Converter

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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9a. External NPN Switch 9b. External NPN Saturated Switch

(See Note 8)

Rsc

Vin

Vout R

R ³ 0 for

constant Vin

8. 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 ms 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.

Rsc

Vin

Vout

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

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

1.25 V

Ref

Reg

Vout

5.0 V/500 mA

1.0 mH

Vout

+100

Optional Filter

Rsc

0.33

Vin

25 V

100 +

R1 1.2 k

3.6 k

Ipk

OSC CT

VCC

-Comp.

470

470 CO

1N5819

220 mH

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 W1.1 A

Efficiency Vin = 25 V, IO = 500 mA 83.7%

Output Ripple With Optional Filter Vin = 25 V, IO = 500 mA 40 mVpp

Figure 11. Step−Down Converter

11a. External NPN Switch 11b. External PNP Saturated Switch

Rsc

Vin

Vout

Rsc

Vin

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

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

1.25 V

Ref

Reg

Vout

-12 V/100 mA Vout

1.0 mH

+100

Optional Filter

Rsc

0.24

Vin

4.5 V to 6.0 V

100

R2 8.2 k

Ipk

OSC CT

Comp.

953

+1500

1N5819

1000 mf+

88 mH

VCC

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 W910 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

Figure 13. Voltage Inverting Converter

13a. External NPN Switch 13b. External PNP Saturated Switch

Vin

Vout

Vin

Vout

Figure 14. External Current Boost Connections for IC Peak Greater than 1.5 A

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

Figure 15. Printed Circuit Board and Component Layout

(Circuits of Figures 9, 11, 13)

INDUCTOR DATA

Converter Inductance (mH) 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, MC33063A, SC34063A, SC33063A, NCV33063A

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Figure 16. Printed Circuit Board for DFN Device

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

http://onsemi.com

Calculation Step−Up Step−Down Voltage−Inverting

ton/toff Vout )VF*Vin(min)

Vin(min) *Vsat

Vout )VF

Vin(min) *Vsat *Vout

|Vout|)VF

Vin *Vsat

(ton + toff)1

toff ton )toff

ton

toff )1

ton )toff

ton

toff )1

ton )toff

ton

toff )1

ton (ton + toff) − toff (ton + toff) − toff (ton + toff) − toff

CT4.0 x 10−5 ton 4.0 x 10−5 ton 4.0 x 10−5 ton

Ipk(switch)

2Iout(max) ǒton

toff )1Ǔ2Iout(max) 2Iout(max) ǒton

toff )1Ǔ

Rsc 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch)

L(min) ǒ(Vin(min) *Vsat)

Ipk(switch) Ǔton(max) ǒ(Vin(min) *Vsat *Vout)

Ipk(switch) Ǔton(max

)

ǒ(Vin(min) *Vsat)

Ipk(switch) Ǔton(max)

CO9Ioutton

Vripple(pp)

Ipk(switch)(ton )toff)

8Vripple(pp)

9Ioutton

Vripple(pp)

Vsat = Saturation voltage of the output switch.

VF = Forward voltage drop of the output rectifier.

The following power supply characteristics must be chosen:

Vin − Nominal input voltage.

Vout − Desired output voltage,

Iout − Desired output current.

fmin − Minimum desired output switching frequency at the selected values of Vin and IO.

Vripple(pp) − Desired peak−to−peak output ripple voltage. In practice, the calculated capacitor value will need 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.

NOTE: For further information refer to Application Note AN920A/D and AN954/D.

|Vout|+1.25 ǒ1)R2

R1Ǔ

Figure 17. Design Formula Table

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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ORDERING INFORMATION

Device Package Shipping†

MC33063AD SOIC−898 Units / Rail

MC33063ADG SOIC−8

(Pb−Free)

98 Units / Rail

MC33063ADR2 SOIC−82500 Units / Tape & Reel

MC33063ADR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

SC33063ADR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

MC33063AP1 PDIP−850 Units / Rail

MC33063AP1G PDIP−8

(Pb−Free)

50 Units / Rail

MC33063AVD SOIC−898 Units / Rail

MC33063AVDG SOIC−8

(Pb−Free)

98 Units / Rail

MC33063AVDR2 SOIC−8

2500 Units / Tape & Reel

MC33063AVDR2G SOIC−8

(Pb−Free)

NCV33063AVDR2* SOIC−8

NCV33063AVDR2G* SOIC−8

(Pb−Free)

MC33063AVP PDIP−850 Units / Rail

MC33063AVPG PDIP−8

(Pb−Free)

50 Units / Rail

MC34063AD SOIC−898 Units / Rail

MC34063ADG SOIC−8

(Pb−Free)

98 Units / Rail

MC34063ADR2 SOIC−82500 Units / Tape & Reel

MC34063ADR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

SC34063ADR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

MC34063AP1 PDIP−850 Units / Rail

MC34063AP1G PDIP−8

(Pb−Free)

50 Units / Rail

SC34063AP1G PDIP−8

(Pb−Free)

50 Units / Rail

MC33063MNTXG DFN8

(Pb−Free)

4000 Units / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specification Brochure, BRD8011/D.

*NCV33063A: Tlow = −40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and

change control.

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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PACKAGE DIMENSIONS

SOIC−8 NB

CASE 751−07

ISSUE AJ

SEATING

PLANE

X 45 _

NOTES:

1. DIMENSIONING AND TOLERANCING PER

ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE

MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)

PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.127 (0.005) TOTAL

IN EXCESS OF THE D DIMENSION AT

MAXIMUM MATERIAL CONDITION.

6. 751−01 THRU 751−06 ARE OBSOLETE. NEW

STANDARD IS 751−07.

0.10 (0.004)

DIM

MIN MAX MIN MAX

INCHES

4.80 5.00 0.189 0.197

MILLIMETERS

B3.80 4.00 0.150 0.157

C1.35 1.75 0.053 0.069

D0.33 0.51 0.013 0.020

G1.27 BSC 0.050 BSC

H0.10 0.25 0.004 0.010

J0.19 0.25 0.007 0.010

K0.40 1.27 0.016 0.050

M0 8 0 8

N0.25 0.50 0.010 0.020

S5.80 6.20 0.228 0.244

−X−

−Y−

0.25 (0.010)

−Z−

0.25 (0.010) ZSXS

____

1.52

0.060

7.0

0.275

0.6

0.024

1.270

0.050

4.0

0.155

ǒmm

inchesǓ

SCALE 6:1

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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PACKAGE DIMENSIONS

PDIP−8

P, P1 SUFFIX

CASE 626−05

ISSUE M

NOTE 5

TOP VIEW

CSEATING

PLANE

0.010 CA

SIDE VIEW

END VIEW

NOTE 3

DIM MIN NOM MAX

INCHES

A−−−− −−−− 0.210

A1 0.015 −−−− −−−−

b0.014 0.018 0.022

C0.008 0.010 0.014

D0.355 0.365 0.400

D1 0.005 −−−− −−−−

e0.100 BSC

E0.300 0.310 0.325

L0.115 0.130 0.150

−−−− −−−− 5.33

0.38 −−−− −−−−

0.35 0.46 0.56

0.20 0.25 0.36

9.02 9.27 10.02

0.13 −−−− −−−−

2.54 BSC

7.62 7.87 8.26

2.92 3.30 3.81

MIN NOM MAX

MILLIMETERS

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME

Y14.5M, 1994.

2. CONTROLLING DIMENSION: INCHES.

3. DIMENSION E IS MEASURED WITH THE LEADS RE-

STRAINED PARALLEL AT WIDTH E2.

4. DIMENSION E1 DOES NOT INCLUDE MOLD FLASH.

5. ROUNDED CORNERS OPTIONAL.

E1 0.240 0.250 0.280 6.10 6.35 7.11

E3 −−−− −−−− 0.430 −−−− −−−− 10.92

0.300 BSC 7.62 BSC

e/2

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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PACKAGE DIMENSIONS

ÉÉÉ

DFN8, 4x4

CASE 488AF−01

ISSUE C

NOTES:

1. DIMENSIONS AND TOLERANCING PER

ASME Y14.5M, 1994.

2. CONTROLLING DIMENSION: MILLIMETERS.

3. DIMENSION b APPLIES TO PLATED

TERMINAL AND IS MEASURED BETWEEN

0.15 AND 0.30MM FROM TERMINAL TIP.

4. COPLANARITY APPLIES TO THE EXPOSED

PAD AS WELL AS THE TERMINALS.

5. DETAILS A AND B SHOW OPTIONAL

CONSTRUCTIONS FOR TERMINALS.

DIM MIN MAX

MILLIMETERS

A0.80 1.00

A1 0.00 0.05

A3 0.20 REF

b0.25 0.35

D4.00 BSC

D2 1.91 2.21

E4.00 BSC

E2 2.09 2.39

e0.80 BSC

K0.20 −−−

L0.30 0.50

C0.15

TOP VIEW

SIDE VIEW

BOTTOM VIEW

ÇÇ

(A3)

SEATING

PLANE

C0.08

C0.10

ÇÇ

8X L

NOTE 3

0.10 C

0.05 C

PIN ONE

REFERENCE

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

0.63

2.21

2.39

0.80

PITCH

4.30

0.35

DETAIL A

OPTIONAL

CONSTRUCTIONS

ÉÉ

ÇÇ

ÉÉ

DETAIL B

MOLD CMPDEXPOSED Cu

ALTERNATE

CONSTRUCTIONS

L1 −−− 0.15

DETAIL B

NOTE 4

DETAIL A

DIMENSIONS: MILLIMETERS

PACKAGE

OUTLINE

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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

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MC34063A/D

SENSEFET is a trademark of Semiconductor Components Industries, LLC.

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