MC34063A-D - ON Semiconductor

 Semiconductor Components Industries, LLC, 2002

April, 2002 – Rev. 10 1Publication Order Number:

MC34063A/D

MC34063A, MC33063A,

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.

•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

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 51 active transistors.

SO–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 11 of this data sheet.

ORDERING INFORMATION

See general marking information in the device marking

section on page 11 of this data sheet.

DEVICE MARKING INFORMATION

Switch

Collector

Switch

Emitter

Timing

Capacitor

Gnd

Driver

Collector

Ipk Sense

VCC

Comparator

Inverting

Input

(Top View)

PIN CONNECTIONS

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MC34063A, MC33063A, NCV33063A

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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 RθJA 100 °C/W

SOIC Package, D Suffix

TA = 25°C PD625 mW

Thermal Resistance RθJA 160 °C/W

Operating Junction Temperature TJ+150 °C

Operating Ambient Temperature Range TA°C

MC34063A 0 to +70

MC33063AV, NCV33063A –40 to +125

MC33063A –40 to +85

Storage Temperature Range Tstg –65 to +150 °C

1. Maximum package power dissipation limits must be observed.

2. ESD data available upon request.

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

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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 µA

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

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

(ISW = 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 Ω to VCC, Forced β  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 µA

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)

MC33063A, MC34063A

MC33063AV, NCV33063A

Regline –

–1.4

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 MC34063A, –40°C for MC33063A, AV, NCV33063A

Thigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV, NCV33063A

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 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.

MC34063A, MC33063A, NCV33063A

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ton

VCC = 5.0 V

Pin 7 = VCC

Pin 5 = Gnd

TA = 25°C

toff

Figure 2. Output Switch On–Off Time versus

Oscillator Timing Capacitor Figure 3. Timing Capacitor Waveform

0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10

CT, OSCILLATOR TIMING CAPACITOR (nF)

, OUTPUT SWITCH ONOFF TIME ( s)

on-off µ

10 µs/DIV

, OSCILLATOR VOLTAGE (V)

OSC

200 mV/DIV

VCC = 5.0 V

Pin 7 = VCC

Pin 2 = Gnd

Pins 1, 5, 8 = Open

CT = 1.0 nF

TA = 25°C

1000

500

200

100

5.0

2.0

1.0

Figure 4. Emitter Follower Configuration Output

Saturation Voltage versus Emitter Current Figure 5. Common Emitter Configuration Output

Switch Saturation Voltage versus

Collector Current

Figure 6. Current Limit Sense Voltage

versus Temperature Figure 7. 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 β = 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.

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170 µH

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 µH

+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 8. Step–Up Converter

MC34063A, MC33063A, NCV33063A

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

(See Note 8)

Rsc

Vin

Vout R

R  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 µs 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 9. External Current Boost Connections for IC Peak Greater than 1.5 A

MC34063A, MC33063A, NCV33063A

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1.25 V

Ref

Reg

Vout

5.0 V/500 mA

1.0 µH

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 µH

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 Ω1.1 A

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

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

Figure 10. Step–Down Converter

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

Rsc

Vin

Vout

Rsc

Vin

Figure 11. External Current Boost Connections for IC Peak Greater than 1.5 A

MC34063A, MC33063A, NCV33063A

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1.25 V

Ref

Reg

Vout

-12 V/100 mA Vout

1.0 µH

+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 µf+

88 µH

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 Ω910 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 12. Voltage Inverting Converter

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

Vin

Vout

Vin

Vout

Figure 13. External Current Boost Connections for IC Peak Greater than 1.5 A

MC34063A, MC33063A, NCV33063A

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5.45′′

2.500′′

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

(Top View, Component Side) *Optional Filter.

Figure 14. Printed Circuit Board and Component Layout

(Circuits of Figures 8, 10, 12)

MC34063A MC34063A MC34063A

INDUCTOR DATA

Converter Inductance (µH) Turns/Wire

Step–Up 170 38 Turns of #22 A WG

Step–Down 220 48 Turns of #22 A WG

Voltage–Inverting 88 28 Turns of #22 A WG

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

MC34063A, MC33063A, NCV33063A

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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) ton

toff 12Iout(max) 2Iout(max) ton

toff 1

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

L(min) (Vin(min) Vsat)

Ipk(switch) ton(max) (Vin(min) Vsat Vout)

Ipk(switch) ton(max

)

(Vin(min) Vsat)

Ipk(switch) ton(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 1R2

R1

Figure 15. Design Formula Table

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ORDERING INFORMATION

Device Package Shipping

MC33063AD SO–8 98 Units / Rail

MC33063ADR2 SO–8 2500 Units / Tape & Reel

MC33063AP1 DIP–8 50 Units / Rail

MC33063AVD SO–8 98 Units / Rail

MC33063AVDR2 SO–8 2500 Units / Tape & Reel

NCV33063AVDR2* SO–8 2500 Units / Tape & Reel

MC33063AVP DIP–8 50 Units / Rail

MC34063AD SO–8 98 Units / Rail

MC34063ADR2 SO–8 2500 Units / Tape & Reel

MC34063AP1 DIP–8 50 Units / Rail

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

site and change control.

MARKING DIAGRAMS

PDIP–8

P, P1 SUFFIX

CASE 626

SO–8

D SUFFIX

CASE 751

x = 3 or 4

A = Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

3x063AP1

AWL

YYWW

33063AVP

AWL

YYWW ALYWA

3x063

MC34063A, MC33063A, NCV33063A

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PACKAGE DIMENSIONS

PDIP–8

P, P1 SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE L

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN

FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR

SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

NOTE 2 –A–

–B–

–T–

SEATING

PLANE

GDK

0.13 (0.005) B M

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A9.40 10.16 0.370 0.400

B6.10 6.60 0.240 0.260

C3.94 4.45 0.155 0.175

D0.38 0.51 0.015 0.020

F1.02 1.78 0.040 0.070

G2.54 BSC 0.100 BSC

H0.76 1.27 0.030 0.050

J0.20 0.30 0.008 0.012

K2.92 3.43 0.115 0.135

L7.62 BSC 0.300 BSC

M--- 10 --- 10

N0.76 1.01 0.030 0.040



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PACKAGE DIMENSIONS

SO–8

D SUFFIX

PLASTIC PACKAGE

CASE 751–07

ISSUE W

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.

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) Z SXS



MC34063A, MC33063A, NCV33063A

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Notes

MC34063A, MC33063A, NCV33063A

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Notes

MC34063A, MC33063A, NCV33063A

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Email: r14525@onsemi.com

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For additional information, please contact your local

Sales Representative.

MC34063A/D

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