ON Semiconductor MC34063A, MC33063A, NCV33063A Technical data

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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.

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

8

Drive

Collector

Q2

100

1.25 V

Reference

Regulator

Sense

V

Comparator

Inverting

Input

SQ

7

I

pk

Oscillator

6

CC

This device contains 51 active transistors.

R

I

pk

C

Comparator

+

−

(Bottom View)

T

Figure 1. Representative Schematic Diagram

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MARKING

DIAGRAMS

8

SOIC−8

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

D SUFFIX

CASE 751

PDIP−8

P, P1 SUFFIX

CASE 626

1

8

1
8

1

3x063

ALYWA

G

3x063AP1

AWL

YYWWG

33063AVP

AWL

YYWWG

PIN CONNECTIONS

Switch

Collector

Switch

Emitter

Timing

Capacitor

GND

1

2

3

45

(Top View)

8

7

6

Driver
Collector

Ipk Sense

V

CC

Comparator
Inverting
Input

© Semiconductor Components Industries, LLC, 2005

December, 2005 − Rev. 18

See detailed ordering and shipping information in the package

ORDERING INFORMATION

dimensions section on page 11 of this data sheet.

1 Publication Order Number:

MC34063A/D

MC34063A, MC33063A, NCV33063A

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)

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
Operating Junction Temperature T
Operating Ambient Temperature Range T

D

R

q

JA
J

A

MC34063A 0 to +70
MC33063AV, NCV33063A −40 to +125
MC33063A −40 to +85

Storage Temperature Range T

stg

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

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
40 Vdc
40 Vdc
40 Vdc

100 mA

1.5 A

1.25 W
100 °C/W

625 mW
160 °C/W

+150 °C

°C

−65 to +150 °C

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MC34063A, MC33063A, 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
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)

MC33063A, MC34063A
MC33063AV, NCV33063A

Input Bias Current (Vin = 0 V) I

Reg

V

th

line

IB

1.225

1.21

−

−

1.25−1.275

1.29

1.4

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

low

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

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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MC34063A, MC33063A, NCV33063A

t

1000

μ

VCC = 5.0 V

500

Pin 7 = V

200

100

50

20

10

5.0

, OUTPUT SWITCH ON-OFF TIME ( s)

2.0

on−off

1.0

t

0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10

Figure 2. Output Switch On−Off Time versus

CC

Pin 5 = GND
T

= 25°C

A

C

, OSCILLATOR TIMING CAPACITOR (nF)

T

Oscillator Timing Capacitor

t

on

t

off

, OSCILLATOR VOLTAGE (V)

OSC

V

VCC = 5.0 V
Pin 7 = V

CC

Pin 2 = GND

Pins 1, 5, 8 = Open

= 1.0 nF

C

T

T

= 25°C

A

10 ms/DIV

Figure 3. Timing Capacitor Waveform

200 mV/DIV

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

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

= 25°C

A

(See Note 7)

IE, EMITTER CURRENT (A)

Figure 4. Emitter Follower Configuration Output

Saturation Voltage versus Emitter 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)

1.1

1.0

0.9

Darlington Connection

0.8

0.7

0.6
VCC = 5.0 V

Pin 7 = V

0.5

0.4

, SATURATION VOLTAGE (V)

CC

0.3

CC

Pins 2, 3, 5 = GND
T

= 25°C

A

(See Note 7)

Forced b = 20

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

IC, COLLECTOR CURRENT(A)

Figure 5. Common Emitter Configuration Outpu

Switch Saturation Voltage versus

Collector Current

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

CC

Pin 2 = GND

Figure 6. Current Limit Sense Voltage

versus Temperature

Figure 7. Standby Supply Current versus

Supply Voltage

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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