ON MC33063AD, MC33063AP1, MC33063AVD, MC33063AVP, MC33063MNTXG Schematic

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

1.5 A, Step-Up/Down/ Inverting Switching Regulators

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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

Q1

1

Switch Collector

2

Switch Emitter

3

Timing Capacitor

45

GND

Drive

Collector

Sense

V

Comparator

Inverting

Input

8

SQ

7

I

pk

Oscillator

6

CC

R

I

pk

C

Comparator

+

-

(Bottom View)

T

Q2

100

1.25 V

Reference

Regulator

MARKING

DIAGRAMS

8

3x063

ALYWA

8

1

8

1

x = 3 or 4 A = Assembly Location L, WL = Wafer Lot Y, YY = Year W, WW = Work Week G or G = Pb−Free Package

SOIC−8

D SUFFIX

CASE 751

PDIP−8

P, P1 SUFFIX

CASE 626

DFN8

CASE 488AF

G

1

8

3x063V ALYWA

G

1

8

3x063AP1

AWL

YYWWG

1

8

33063AVP

AWL

YYWWG

1

33063

ALYWA

G

This device contains 79 active transistors.

Figure 1. Representative Schematic Diagram

August, 2010 − Rev. 23

See detailed ordering and shipping information in the package

ORDERING INFORMATION

dimensions section on page 12 of this data sheet.

1 Publication Order Number:

MC34063A/D

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

Switch

Collector

Switch

Emitter

Timing

Capacitor

GND

1

2

3

45

(Top View)

8

7

6

Driver Collector

I

Sense

pk

V

CC

Comparator Inverting Input

Switch Collector

Switch Emitter

Timing Capacitor

GND

EP Flag

(Top View)

Driver Collector

I

Sense

pk

V

CC

Comparator Inverting Input

Figure 2. Pin Connections

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V

Comparator Input Voltage Range V

Switch Collector Voltage V

Switch Emitter Voltage (V

= 40 V) V

Pin 1

Switch Collector to Emitter Voltage V

Driver Collector Voltage V

Driver Collector Current (Note 1) I

Switch Current I

CC

IR

C(switch)

E(switch)

CE(switch)

C(driver)

SW

Power Dissipation and Thermal Characteristics

Plastic Package, P, P1 Suffix

TA = 25°C P

Thermal Resistance

D

R

q

JA

SOIC Package, D Suffix

TA = 25°C P

Thermal Resistance

D

R

q

JA

DFN Package

TA = 25°C P Thermal Resistance

Operating Junction Temperature T

Operating Ambient Temperature Range T

D

R

q

JA

J

A

MC34063A, SC34063A 0 to +70

MC33063AV, NCV33063A −40 to +125

MC33063A, SC33063A −40 to + 85

Storage Temperature Range T

stg

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.

40 Vdc

−0.3 to + 40 Vdc

40 Vdc

100 mA

1.5 A

1.25 W

115 °C/W

625 mW

160 °C/W

1.25 mW 80 °C/W

+150 °C

°C

−65 to +150 °C

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2

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

ELECTRICAL CHARACTERISTICS (V

Characteristics

= 5.0 V, TA = T

CC

low

to T

[Note 4], unless otherwise specified.)

high

Symbol Min Typ Max Unit

OSCILLATOR

Frequency (V

Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) I

Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) I

Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C) I

Current Limit Sense Voltage (I

= 0 V, CT = 1.0 nF, TA = 25°C) f

Pin 5

chg

= I

, TA = 25°C) V

dischg

osc

chg

dischg

dischg/Ichg

ipk(sense)

24 33 42 kHz

24 35 42

140 220 260

mA

5.2 6.5 7.5 −

250 300 350 mV

OUTPUT SWITCH (Note 5)

Saturation Voltage, Darlington Connection

= 1.0 A, Pins 1, 8 connected)

(I

SW

Saturation Voltage (Note 6)

(I

= 1.0 A, R

SW

= 82 W to VCC, Forced b ] 20)

Pin 8

DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) h

Collector Off−State Current (VCE = 40 V) I

V

CE(sat)

V

CE(sat)

C(off)

FE

− 1.0 1.3 V

− 0.45 0.7 V

50 75 − −

− 0.01 100

mA

COMPARATOR

Threshold Voltage

= 25°C

T

A

= T

T

to T

A

low

high

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

MC33063, MC34063 MC33063V, NCV33063

Input Bias Current (Vin = 0 V) I

Reg

V

th

line

IB

1.225

1.21

−

1.25−1.275

1.29

1.4

5.0

6.0

− − 20 −400 nA

V

mV

TOTAL DEVICE

Supply Current (V

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

V

Pin 5

4. T

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

low

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

T

high

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

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

CC

I

CC

− − 4.0 mA

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 b of output switch :

ICoutput

ICdriver – 7.0 mA *

w 10

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

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3

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

18

VCC = 5.0 V, Pin 7 = V

16

Pin 5 = GND, TA = 25°C

14

12

10

8

6

OFF TIME (ms)

4

2

0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Ct, TIMING CAPACITOR CAPACITANCE (nF)

CC

ON TIME (ms)

OFF TIME (ms)

FREQUENCY (kHz)

Figure 3. Oscillator Frequency

1.8

1.7

1.6

1.5

1.4

1.3

, SATURATION VOLTAGE (V)

1.2

1.1

CE(sat)

V

1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

IE, EMITTER CURRENT (A)

VCC = 5.0 V Pins 1, 7, 8 = V Pins 3, 5 = GND T

= 25°C

A

(See Note 7)

180

160

140

120

100

80

60

40

20

0

, OSCILLATOR VOLTAGE (V)

VCC = 5.0 V

OSC

Pin 7 = V

V

Pin 2 = GND

ON TIME (ms), FREQUENCY (kHz)

Pins 1, 5, 8 = Open

CC

CT = 1.0 nF TA = 25°C

10 ms/DIV

200 mV/DIV

Figure 4. Timing Capacitor Waveform

1.1

1.0

0.9

0.8

0.7

0.6 VCC = 5.0 V

Pin 7 = V

0.5

0.4

, SATURATION VOLTAGE (V)

CC

0.3

0.2

CE(sat)

0.1

V

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

CC

Pins 2, 3, 5 = GND T

= 25°C

A

(See Note 7)

IC, COLLECTOR CURRENT(A)

Darlington Connection

Forced b = 20

Figure 5. Emitter Follower Configuration Output

Saturation Voltage versus Emitter Current

Figure 6. Common Emitter Configuration Output

Switch Saturation Voltage versus

Collector Current

400

380

VCC = 5.0 V

360

I

= I

chg

340

320

300

280

260

, CURRENT LIMIT SENSE VOLTAGE (V)

240

220

200

IPK(sense)

-55 -25 0 25 50 75 100 125

V

dischg

TA, AMBIENT TEMPERATURE (°C)

Figure 7. Current Limit Sense Voltage

versus Temperature

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

3.6

3.2

2.8

2.4

2.0

1.6

1.2

, SUPPLY CURRENT (mA)

0.8

CC

I

0.4

0

0 5.0 10 15 20 25 30 35 40

VCC, SUPPLY VOLTAGE (V)

CT = 1.0 nF Pin 7 = V Pin 2 = GND

Figure 8. Standby Supply Current versus

Supply Voltage

CC

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4

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

170 mH

L

8

1

180

SQRQ2

Q1

V

12 V

7

I

R

sc

0.22

in

6

+

100

pk

V

CC

+

Comp.

-

OSC

C

T

1.25 V Ref

Reg

5

2

3

C

4

1N5819

T

1500

pF

1.0 mH

R1 2.2 k

R2

47 k

+

330 C

28 V/175 mA

O

V

out

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

+

100

Optional Filter

V

out

Figure 9. Step−Up Converter

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ON MC33063AD, MC33063AP1, MC33063AVD, MC33063AVP, MC33063MNTXG Schematic [ru]