TEXAS INSTRUMENTS MC 33063 ADG Instructions

−

+

QS

1.25-V

Reference

Regulator

R

C

T

I

pk

Oscillator

Q2

Q1

Switch
Collector

4

Switch
Emitter

Timing
Capacitor

GND

3

2

18

7

6

5

Comparator

Inverting Input

V

CC

I

pk

Sense

Drive

Collector

100 W

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SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

MC3x063A 1.5-A Peak Boost/Buck/Inverting Switching Regulators

1 Features 3 Description

1

• Wide Input Voltage Range: 3 V to 40 V

• High Output Switch Current: Up to 1.5 A

• Adjustable Output Voltage

• Oscillator Frequency Up to 100 kHz

• Precision Internal Reference: 2%

• Short-Circuit Current Limiting

• Low Standby Current

2 Applications

• Blood Gas Analyzers: Portable

• Cable Solutions

• HMIs (Human Machine Interfaces)

• Telecommunications

• Portable Devices

• Consumer & Computing

• Test & Measurement

The MC33063A and MC34063A devices are easy-to­use ICs containing all the primary circuitry needed for
building simple DC-DC converters. These devices
primarily consist of an internal temperature­compensated reference, a comparator, an oscillator,
a PWM controller with active current limiting, a driver,
and a high-current output switch. Thus, the devices
require minimal external components to build
converters in the boost, buck, and inverting
topologies.

The MC33063A device is characterized for operation
from –40°C to 85°C, while the MC34063A device is
characterized for operation from 0°C to 70°C.

Device Information

PART NUMBER PACKAGE (PIN) BODY SIZE

MC3x063A SON (8) 4.00 mm × 4.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

MC33063A,MC34063A

(1)

SOIC (8) 4.90 mm × 3.91 mm

PDIP (8) 9.81 mm × 6.35 mm

4 Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

www.ti.com

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Simplified Schematic............................................. 1

5 Revision History..................................................... 2

6 Pin Configuration and Functions ......................... 3

7 Specifications......................................................... 4

7.1 Absolute Maximum Ratings ...................................... 4

7.2 ESD Ratings.............................................................. 4

7.3 Recommended Operating Conditions....................... 4

7.4 Thermal Information.................................................. 4

7.5 Electrical Characteristics—Oscillator........................ 4

7.6 Electrical Characteristics—Output Switch................. 5

7.7 Electrical Characteristics—Comparator.................... 5

7.8 Electrical Characteristics—Total Device ................... 5

7.9 Typical Characteristics.............................................. 6

8 Detailed Description .............................................. 7

8.1 Overview................................................................... 7

8.2 Functional Block Diagram ......................................... 7

8.3 Feature Description................................................... 7

8.4 Device Functional Modes.......................................... 7

9 Application and Implementation .......................... 8

9.1 Application Information.............................................. 8

9.2 Typical Application.................................................... 9

10 Power Supply Recommendations..................... 17

11 Layout................................................................... 17

11.1 Layout Guidelines................................................. 17

11.2 Layout Example.................................................... 17

12 Device and Documentation Support................. 18

12.1 Related Links........................................................ 18

12.2 Trademarks........................................................... 18

12.3 Electrostatic Discharge Caution............................ 18

12.4 Glossary................................................................ 18

13 Mechanical, Packaging, and Orderable

Information........................................................... 18

5 Revision History

Changes from Revision M (January 2011) to Revision N Page

• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,

Packaging, and Orderable Information section. ..................................................................................................................... 1

• Deleted Ordering Information table. ....................................................................................................................................... 1

2 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated

Product Folder Links: MC33063A MC34063A

1

2

3

4

8

7

6

5

Switch Collector

Switch Emitter

Timing Capacitor

GND

Driver Collector
I

pk

V

CC

Comparator Inverting Input

D (SOIC) OR P (PDIP) PACKAGE

(TOP VIEW)

DRJ (QFN) PACKAGE

(TOP VIEW)

Comparator Inverting Input

Switch Collector

2

3

4

1

8

7

6

5

Switch Emitter

Timing Capacitor

GND

V

CC

I

pk

Driver Collector

†

The exposed thermal pad is electrically bonded internally to pin 4 (GND) .

†

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6 Pin Configuration and Functions

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

NAME NO.

Switch Collector 1 I/O High-current internal switch collector input.
Switch Emitter 2 I/O High-current internal switch emitter output.
Timing Capacitor 3 — Attach a timing capacitor to change the switching frequency.
GND 4 — Ground
Comparator

Inverting Input
V

CC

I

PK

Driver Collector 8 I/O Darlington pair driving transistor collector input.

PIN

Pin Functions

TYPE DESCRIPTION

5 I Attach to a resistor divider network to create a feedback loop.
6 I Logic supply voltage. Tie to VIN.

7 I Current-limit sense input.

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Product Folder Links: MC33063A MC34063A

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

www.ti.com

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

V

CC

V

IR

V

C(switch)

V

E(switch)

V

CE(switch)

V

C(driver)

I

C(driver)

I

SW

T

J

T

stg

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating

Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Supply voltage 40 V
Comparator inverting input voltage range –0.3 40 V
Switch collector voltage 40 V
Switch emitter voltage V
Switch collector to switch emitter voltage 40 V
Driver collector voltage 40 V
Driver collector current 100 mA
Switch current 1.5 A
Operating virtual junction temperature 150 °C
Storage temperature range –65 150 °C

7.2 ESD Ratings

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins

V

(ESD)

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

Electrostatic discharge V

Charged device model (CDM), per JEDEC specification JESD22-C101,

(2)

all pins

(1)

MIN MAX UNIT

= 40 V 40 V

PIN1

VALUE UNIT

(1)

2500
1500

7.3 Recommended Operating Conditions

MIN MAX UNIT

V

Supply voltage 3 40 V

CC

T

Operating free-air temperature °C

A

MC33063A –40 85
MC34063A 0 70

7.4 Thermal Information

MC33063A

THERMAL METRIC

(1)

D DRJ P UNIT

8 PINS

R

θJA

Junction-to-ambient thermal resistance 97 41 85 °C/W

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report (SPRA953).

7.5 Electrical Characteristics—Oscillator

VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)

f

osc

I

chg

I

dischg

I

dischg/Ichg

V

Ipk

PARAMETER TEST CONDITIONS T

Oscillator frequency V

= 0 V, CT= 1 nF 25°C 24 33 42 kHz

PIN5

A

Charge current VCC= 5 V to 40 V 25°C 24 35 42 μA
Discharge current VCC= 5 V to 40 V 25°C 140 220 260 μA
Discharge-to-charge current ratio V
Current-limit sense voltage I

PIN7

dischg

= V

= I

chg

CC

25°C 5.2 6.5 7.5 —
25°C 250 300 350 mV

MIN TYP MAX UNIT

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Product Folder Links: MC33063A MC34063A

MC33063A,MC34063A

www.ti.com

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

7.6 Electrical Characteristics—Output Switch

VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)

PARAMETER TEST CONDITIONS T

V

CE(sat)

V

CE(sat)

h

FE

I

C(off)

(1) Low duty-cycle pulse testing is used to maintain junction temperature as close to ambient temperature as possible.
(2) In the non-Darlington configuration, if the output switch is driven into hard saturation at low switch currents (≤300 mA) and high driver

Saturation voltage –
Darlington connection

Saturation voltage – ISW= 1 A, R
non-Darlington connection

ISW= 1 A, pins 1 and 8 connected Full range 1 1.3 V

= 82 Ω to VCC,

(2)

forced β ∼ 20

PIN8

DC current gain ISW= 1 A, VCE= 5 V 25°C 50 75 —
Collector off-state current VCE= 40 V Full range 0.01 100 μA

currents (≥30 mA), it may take up to 2 μs for the switch to come out of saturation. This condition effectively shortens the off time at
frequencies ≥30 kHz, becoming magnified as temperature increases. The following output drive condition is recommended in the non­Darlington configuration:
Forced β of output switch = I
forward bias the Vbeof the switch.

C,SW

/ (I

– 7 mA) ≥ 10, where ∼7 mA is required by the 100-Ω resistor in the emitter of the driver to

C,driver

(1)

A

MIN TYP MAX UNIT

Full range 0.45 0.7 V

7.7 Electrical Characteristics—Comparator

VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)

V

ΔV
I

IB

PARAMETER TEST CONDITIONS T

th

th

Threshold voltage V

Threshold-voltage line regulation VCC= 5 V to 40 V Full range 1.4 5 mV

A

25°C 1.225 1.25 1.275

Full range 1.21 1.29

Input bias current VIN= 0 V Full range –20 –400 nA

MIN TYP MAX UNIT

7.8 Electrical Characteristics—Total Device

VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)

PARAMETER TEST CONDITIONS T

I

CC

Supply current V

VCC= 5 V to 40 V, CT= 1 nF,

= VCC, V

PIN7

V

= GND, All other pins open

PIN2

> Vth, Full range 4 mA

PIN5

A

MIN MAX UNIT

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Product Folder Links: MC33063A MC34063A

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, Collector Current (A)

V

CE(SAT)

, Output Switch

Saturation V

oltage (V)

Darlington Connection

VCC= 5 V
Pin 7 = V

CC

Pin 2, 3, 5 = GND
TA= 25°C

Force Beta = 20

0

0 1

0.0

0.4

0.8

1.2

1.6

2.0

2.4

2.8

3.2

3.6

0 5 10 15 20 25 30 35 40

VCC, Supply Voltage (V)

I

CC

, Supply Current (mA)

CT= 1 nF
Pin 7 = V

CC

Pin 2 = GND
TA= 25°C

1

10

100

1000

0.01 0.1 1 10
CT, Oscillator Timing Capacitor (nF)

t

ON-OFF

, Output Switch

On-Off Time (µs)

VCC= 5 V

Pin 7 = V

CC

Pin 5 = GND
TA= 25°C

t

ON

t

OFF

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

IE, Emitter Current (A)

V

CE(SAT)

, Output Switch

Saturation V

oltage (V)

VCC= 5 V
Pin 1, 7, 8 = V

CC

Pin 3, 5 = GND
TA= 25°C

1

10

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

7.9 Typical Characteristics

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Figure 1. Output Switch On-Off Time vs

Oscillator Timing Capacitor

Figure 3. Output Switch Saturation Voltage vs

Collector Current (Common-Emitter Configuration)

Figure 2. Output Switch Saturation Voltage vs

Emitter Current (Emitter-Follower Configuration)

Figure 4. Standby Supply Current vs Supply Voltage

6 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated

Product Folder Links: MC33063A MC34063A

−

+

QS

1.25-V

Reference

Regulator

R

C

T

I

pk

Oscillator

Q2

Q1

Switch
Collector

4

Switch
Emitter

Timing
Capacitor

GND

3

2

18

7

6

5

Comparator

Inverting Input

V

CC

I

pk

Sense

Drive

Collector

100 W

MC33063A,MC34063A

www.ti.com

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

8 Detailed Description

8.1 Overview

The MC33063A and MC34063A devices are easy-to-use ICs containing all the primary circuitry needed for
building simple DC-DC converters. These devices primarily consist of an internal temperature-compensated
reference, a comparator, an oscillator, a PWM controller with active current limiting, a driver, and a high-current
output switch. Thus, the devices require minimal external components to build converters in the boost, buck, and
inverting topologies.

The MC33063A device is characterized for operation from –40°C to 85°C, while the MC34063A device is
characterized for operation from 0°C to 70°C.

8.2 Functional Block Diagram

8.3 Feature Description

• Wide Input Voltage Range: 3 V to 40 V

• High Output Switch Current: Up to 1.5 A

• Adjustable Output Voltage

• Oscillator Frequency Up to 100 kHz

• Precision Internal Reference: 2%

• Short-Circuit Current Limiting

• Low Standby Current

8.4 Device Functional Modes

8.4.1 Standard operation

Based on the application, the device can be configured in multiple different topologies. See the Application and

Implementation section for how to configure the device in several different operating modes.

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Product Folder Links: MC33063A MC34063A

8

7

6

1

2

R*

* R 0 for constant V

in

8

7

6

1

2

V

OUT

R

SC

V

IN

R

SC

V

IN

V

OUT

a) EXTERNAL npn SWITCH b) EXTERNAL npn SATURATED SWITCH (see Note A)

7

→

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.

9.1 Application Information

9.1.1 External Switch Configurations for Higher Peak Current

www.ti.com

A. 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 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 because the output switch cannot saturate. If a non-Darlington configuration is used, the output drive
configuration in Figure 7b is recommended.

Figure 5. Boost Regulator Connections for ICPeak Greater Than 1.5 A

8 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated

Product Folder Links: MC33063A MC34063A

QS

R

C

T

I

pk

Q2

Q1

2

1

Oscillator

_

+

1.25-V
Reference
Regulator

4

5

3

8

7

6

R

SC

0.24 W

953 W

R1

C

O

1N5819

1500 pF

R2

8.2 kW

100 mF

+

V

CC

V

OUT

−12 V/100 mA

1.0 mH

100 mF

Optional Filter

V

IN

4.5 V to 6.0 V

+

+

1000 mF

+

L

88 mH

Comparator

V

OUT

= –1.25 (1+

R2
R1

)

V

IN

V

OUT

V

IN

V

OUT

8

7

6

4

3

2

1

8

7

6

4

3

2

1

5

5

a) External NPN Switch b) External PNP Saturated Switch

V

IN

8

7

6

1

2

8

7

6

1

2

R

SC

V

IN

R

SC

V

OUT

V

OUT

a) EXTERNAL npn SWITCH b) EXTERNAL pnp SATURATED SWITCH

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Application Information (continued)

Figure 6. Buck Regulator Connections for ICPeak Greater Than 1.5 A

MC33063A,MC34063A

SLLS636N –DECEMBER 2004–REVISED JANUARY 2015

Figure 7. Inverting Regulator Connections for ICPeak Greater Than 1.5 A

9.2 Typical Application

9.2.1 Voltage-Inverting Converter Application

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