MC34063A Industrial Standard, Universal DC/DC Converter FEATURES

DESCRIPTION

3V to 30V Input Voltage Operation. Internal 1.6A Peak Current Switch.

The

Internal ±1.8% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to 100KHz. Current Limiting.

industrial standard MC34063A, is a monolithic

MC34063A

by

Analog

Integrations

Corporation, an improved second source over the control circuit containing the primary functions required for DC/DC converters. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle

APPLICATIONS

oscillator with an active current limit circuit, driver

Saver for Cellular phones DC-DC Converter Module

and high current output switch. This device is specifically designed to be incorporated in stepdown, step-up and voltage-inverting applications with a minimum number of external components. The ±1.8% internal reference and low quiescent current of 1.6mA are among the improvements of the device over the competition.

TYPICAL APPLICATION CIRCUIT VOUT

L D1 1N5819

*RS

7

VIN

6 5

+ C1

100µF

DRI

SC

IPK

SE

VCC

TC

FB

GND

CO

1 2

8.6V SAVER *:Io=0.3/RS

3 4

CT

470pF

8

+

220µF

200µH

MC34063A

RB RA 5.6K

33K

Saver Circuit for Cellular Phone

Analog Integrations Corporation

Si-Soft Research Center

DS-34063AP-03 070204

3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C. TEL: 886-3-5772500

FAX: 886-3-5772510

www.analog.com.tw

1

MC34063A ORDERING INFORMATION MC34063A XX

PIN CONFIGURATION PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE

TOP VIEW

SC 1

C: COMMERCIAL P: LEAD FREE COMMERCIAL Example:

8 DRI

SE 2

7 IPK

TC 3

6 VCC

GND 4

5 FB

MC34063ACSTR in SO-8 Package & Tape & Reel Packing Type MC34063APSTR in SO-8 Lead Free Package & Tape & Reel Packing Type

ABSOLUTE MAXIMUM RATINGS Supply Voltage

30V

Comparator Input Voltage Range

-0.3V~30V

Switch Collector Voltage

30V

Switch Emitter Voltage

30V

Switch Collector to Emitter Voltage

30V

Driver Collector Voltage

30V

Switch Current

1.6A

Power Dissipation and Thermal Characteristics DIP Package TA= 25°C

1.0W

Thermal Resistance

100°C /W

SO Package TA= 25°C

625mW

Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 Sec.)

.160°C /W 125°C -40°C~85°C - 65°C~150°C

…………………………………………………260°C

Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

TEST CIRCUIT Refer to Typical Application Circuit.

2

MC34063A ELECTRICAL CHARACTERISTICS (VCC= 5V, TA=25°C, unless otherwise

specified.) (Note1)

PARAMETER

TEST CONDITIONS

SYMBOL

MIN.

TYP.

MAX. UNIT

Oscillator Charging Current

5.0V≤VCC≤30V

ICHG

10

25

40

µA

Discharge Current

5.0V≤VCC≤30V

IDISCHG

100

150

200

µA

Voltage Swing

PIN 3

Discharge to Charge Current Ratio

VIPK(SENSE) =VCC

Current Limit Sense Voltage

ICHG=IDISCHG

VOSC

0.6

IDISCHG/ ICHG

6.0

VIPK(SENSE)

250

V

300

350

mV

Output Switch Saturation Voltage, Darlington Connection

ISW=1.0A; VC(DRIVER)=VC(SWITCH)

VCE(SAT)

1.0

1.3

V

Saturation Voltage

ISW=1.0A; IC(DRIVER)=50mA (Forced β≅20)

VCE (SAT)

0.4

0.7

V

DC Current Gain

ISW=1.0A; VCE=5.0V

Collector Off-State Current

VCE=30V

IC(OFF)

Threshold Voltage

TA=25°C

VFB

Threshold Voltage

0°C≤TA≤70°C

Threshold Voltage Line Regulation

3.0V≤VCC≤30V

Input Bias Current

Supply current

hFE

35

120 10

nA

Comparator 1.227

1.25

1.21

1.273 1.29

V

REGLINE

0.1

0.3

mV/V

VIN=0V

IIB

0.4

1

µA

VIPK(SENSE)=VCC VPIN 5>VFB 5.0V≤VCC≤30V CT=0.001µF, PIN 2=GND Remaining pins open

ICC

1.6

3

mA

Note 1: Specifications are production tested at TA=25℃. Specifications over the -40℃ to 85℃ operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC).

3

MC34063A

2

ICC, Supply Current (mA)

VCC=5V VIPK=VCC PIN 5=GND

1000

tON-OFF Output Switch ON-OFF Time

TYPICAL PERFORMANCE CHARACTERISTICS

100

ON TIME

1

10

OFF TIME

1

0.1

10

0.4

CT=1nF Pin 2= GND

1.22

10

Fig. 3

20

30

40

50

60

70

80

1.5 1.4

1.3

0

10

15

25

20

30

VCC = 5V CT=1nF Pin 5= GND

330 320 310 300 290 280 270 260 250

0

0.5

1

1.5

IE, Emitter Current (A) Fig. 5 Emmiter-Follower Configuration Output Switch Saturation Voltage vs. Emmiter Current

10

20

30

40

50

60

70

80

Temperature (°C) Fig. 4

VCE(SAT) Saturation Voltage (V)

VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND

1.6

340

Temperature (°C) VFB, Threshold Voltage vs. Temperature

1.8

1.7

5

350

VCC = 5V

1.24

1.2 0

0

VCC, Supply Voltage (V) Fig. 2 Standby Supply Current vs. Supply Voltage

VIPK, Threshold Voltage (mV)

VFB, Threshold Voltage (V)

1.26

VCE(SAT) Saturation Voltage (V)

0.8

CT, Oscillator Timing Capacitor (nF) Fig. 1 Output Switch ON-OFF Time vs. Oscillator Timing Capacitor

1.28

CT=1nF VIPK=VCC PIN 2=GND

1.2

0

100

1.3

1.2

1.6

IPK Threshold Voltage vs. Temperature

1.4 1.2 1.0

VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND Darlington Connection

0.8 0.6 0.4 0.2

Forced Beta = 20

0 0

0.5

1

1.5

IC, Collector Current (A) Fig. 6 Common-Emitter Configuration Output Switch Saturation Voltage vs. Collector Current

4

MC34063A BLOCK DIAGRAM 1

SC

8 Q2

DRI

QS

Q1

R 80

2

SE

7

IPK

IS

CT

Oscillator TC

6

3 Comparator 1.25V Reference Voltage

GND

4

VCC

+

-

5

FB

PIN DESCRIPTIONS PIN 1: SC

- The switch collector is 1.6A.

PIN 5: FB

PIN 2: SE

- Darlington switch emitter

PIN 6: VCC - Power supply input

PIN 3: TC

- Oscillator timing capacitor

PIN 7: IPK

- Highside current sense input, VCC - VIPK=300mV

PIN 8: DRI

- Drive collector

PIN 4: GND - Power GND

- Feedback comparator inverting input

5

MC34063A

APPLICATION INFORMATION

•

DESIGN FORMULA TABLE CALCULATION tON tOFF

STEP-DOWN

STEP-UP

VOLTAGE-INVERTING

VOUT + VF VIN(MIN) - VSAT - VOUT

VOUT + VF - VIN(MIN) VIN(MIN) - VSAT

VOUT + VF VIN - VSAT

1 FMIN

1 FMIN

1 FMIN

(tON + tOFF) MAX

-5

CT

4x10 tON

IC (SWITCH)

2IOUT(MAX)

RS (

VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH)

IC ( SWITCH ) (t ON + t OFF ) 8V RIPPLE ( P - P )

VSAT - Saturation voltage of the output switch. - Forward voltage drop of the ringback VF rectifier The following power supply characteristics must be chosen: VIN - Nominal input voltage. VOUT - Desired output voltage, V OUT =1.25 (1 + RB/RA) IOUT

2IOUT(MAX) (

0.3/IC(SWITCH)

L(MIN)

Co

-5

- Desired output current.

-5

4 x 10 tON t ON + t OFF ) t OFF

4 x 10 tON 2IOUT(MAX) (

0.3/ IC (SWITCH) (

VIN(MIN) - VSAT )tON(MAX) IC(SWITCH)

IOUT tON VRIPPLE(P - P)

t ON + t OFF ) t OFF

0.3/ IC (SWITCH) (

VIN(MIN) - VSAT )tON(MAX) IC(SWITCH)

IOUT tON VRIPPLE(P - P)

desired output switching FMIN - Minimum frequency at the selected values for VIN and IOUT. VRIPPLE (P-P)- Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.

6

MC34063A

APPLICATION EXAMPLES VOUT

200µH L + 8 RS 0.25

7 6

VIN 10~20V C1

5

+

DRI

SC 1

IPK

SE

VCC

TC

FB

100µF

D1 1N5821

5V/500mA CO 470µF

2 3 4

GND

RB

470pF CT

3K6 RA 1K2

MC34063A

Line Regulation

VIN = 10V ~20V @ IO=500mA

40mV

Load Regulation

VIN = 15V, @ IO=10mA ~ 500mA

5mV

Short Circuit Current

VIN =15V, @ RL = 0.1Ω

1.3A

Fig. 1 Step-Down Converter

SC 1

8 DRI RS 0.22

VIN 10~22V

7

IPK

SE

6 VCC 5

+ C1 100µF

TC GND

FB

MC34063A

RA

RB

1K2

3K6

2

R1 1K

R2

Q1

470

200µH

3

L

4 CT 470pF

D1

1N5821

+

VOUT 5V/500mA Co 470µF

Fig. 2 Step-Down Converter with External PNP Saturation Switch

7

MC34063A

APPLICATION EXAMPLES (Continued) D1

200µH L

RS 0.22

VIN 8~16V

+ 100µF C1

DRI

SC

7 IPK

SE

6 VCC

TC

5 FB

28V/200mA

GS SS14

R1 100 8

VOUT

GND

CO 220µF

1

+

2 3 4 100pF

CT

MC34063A RB

RA

47K

2.2K

Line Regulation

VIN = 8V ~16V @ IO=200mA

100mV

Load Regulation

VIN = 12V, @ IO=80mA ~ 200mA

5mV

Fig. 3 Step-Up Converter

D1

L

R1

VOUT 8 7

RS VIN

6 + C1 RA

5

DRI

SC 1

IPK

SE 2 TC

VCC FB

GND

CO Q1

3 4

+

R2 CT

MC34063A RB

Fig. 4 Step-Up Converter with External NPN Switch

8

MC34063A

APPLICATION EXAMPLES (Continued)

1 2 L 100µH

-12V/100mA

4

CT 680pF

D1 1N5819

VOUT

3

+

SC

DRI

SE

IPK

8 7

S

RS 0.25

VCC 6

TC

+

FB 5

GND

C1 100µF

VIN 4.5V~6V

MC34063A

RA 953

CO 470µF

RB 8.2K

Line Regulation

VIN = 4.5V ~6V @ IO=100mA

20mV

Load Regulation

VIN = 5V, @ IO=10mA ~ 100mA

100mV

Fig.5 Inverting Converter

R2

RS VIN C1

+

8 DRI

SC 1

7 IPK

SE 2

6 VCC

TC 3 GND 4

5 FB

R1 Q1

CT

L

D1

MC34063A

RA RB

VOUT

CO +

Fig 6. Voltage Inverting Converter with PNP Saturated Switch

9

MC34063A

PHYSICAL DIMENSIONS

(unit: mm)

8 LEAD PLASTIC SO (CS) (PS) D

H E

e

h x 45°

SYMBOL

MIN

MAX

A

1.35

1.75

A1

0.10

0.25

B

0.33

0.51

C

0.19

0.25

D

4.80

5.00

E

3.80

4.00

e

A 0.25

C A1

Gauge Plane Seating Plane

B

L

θ

1.27BSC

H

5.80

6.20

h

0.25

0.50

L

0.40

1.27

θ

0°

8°

SYMBOL

MIN

MAX

A

—

5.33

A1

0.38

—

A2

2.92

4.95

b

0.36

0.56

b2

1.14

1.78

c

0.20

0.35

D

9.01

10.16

D1

0.13

—

E

7.62

8.26

E1

6.10

7.11

8 LEAD PLASTIC DIP (CN) (PN) D

E1

E A2

A

A1

c

L

b D1

b2

eA e

eB

e

2.54 BSC

eA

7.62 BSC

eB

—

10.92

L

2.92

3.81

Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.

10