AMC34063ADMT - ADD Microtech Inc.

AMC DOC. #: AMC34063_C

November 2002

Copyright  2002, ADD Microtech Corp. 1 www.addmtek.com

DESCRIPTION FEATURES

The AMC34063A is designed for the applications which require

DC - DC converters. It can be operated in a wide input range

from 3.0V to 40V and has the controlled duty cycle oscillator,

driver and high current output switch. Also, With the internal

temperature compensation circuit, the AMC34063A provides an

internally trimmed precision 2% reference voltage of 1.25V.

These features make the AMC34063A suitable for step-up,

step-down and voltage–inverting applications.

! Wide Input Operating Range:

3.0V to 40V

! Output Switch Current up to

1.5A

! 100KHz operational Frequency

! Low Standby Current

# Internally trimmed 2% 1.25V

Reference Voltage

# Adjustable Output Voltage

# Available in 8 Pin Plastic DIP

and 8 Pin S.O Packages

# Direct pin-to-pin replacement for

industrial product MC34063A.

APPLICATIONS PACKAGE PIN OUT

# Chargers

# Adaptors

# Mother Board

# Scanner

ORDER INFORMATION

Plastic DIP Plastic SO-8

TA (°C) M 8-pin DM 8-pin

0 to 70 AMC34063AM AMC34063ADM

Note: All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e.

AMC34063ADMT).

DC - DC CONVERTER

CONTROL CIRCUITS

AMC34063A

1

2

3

4

8

7

6

5

M PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

DM PACKAGE

(TOP VIEW)

SC DrC

ISEN

SE

Cap VCC

V

FB

GND

SC DrC

ISEN

SE

Cap VCC

V

FB

GND



A

AA

ADD MICROTECH CORP.

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Copyright  2002, ADD Microtech Corp. 2 www.addmtek.com

ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage (VCC) ………………………………………………………………………………..…40V

Operating Junction temperature (M, DM Packages) ………………………………................................ 150 °C

Storage Temperature Range …………………………………………………………………...…. -65°C to 150°C

Lead temperature (Soldering, 10 seconds) …………………………………………………………..………300°C

Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.

Currents are positive into, negative out of the specified terminal.

THERMAL DATA

M PACKAGE:

Power dissipation (PD), TA = 25 °C 1.31W

Thermal Resistance-Junction to Ambient, θJA 95°C /W

DM PACKAGE:

Power dissipation (PD), TA = 25 °C 757mW

Thermal Resistance-Junction to Ambient, θJA 165°C /W

BLOCK DIAGRAM

Oscillator

4

3

Gnd

Cap

1.25V

Reference

C

T

2

1

SE

SC

100

Q2

Q1 Q

Isen

5

6

V

FB

V

CC

7

8

R

S

SEN

I

DrC

Pin Assignment Descriptions

Pin 1 : SC - Switch Collector Pin 8 : DrC - Driver Collector

Pin 2 : SE - Switch Emitter Pin 7 : ISEN - I Peak Sense

Pin 3 : Cap - Oscillator Timing Capacitor Pin 6 : VCC - Power Supply

Pin 4 : GND - Ground Pin 5 : VFB - Comparator inverting input

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Copyright  2002, ADD Microtech Corp. 3 www.addmtek.com

RECOMMENDED OPERATING CONDITIONS

Recommended Operating

Parameter Symbol Min. Typ. Max. Units

Comparator Input Voltage VFB -0.3 to + 40 V

Switch Collector Voltage VC(switch) 40 V

Switch Emitter Voltage (VPin1=40V) VE(switch) 40 V

Switch Collector to Emitter Voltage VCE(switch) 40 V

Driver Collector Voltage VC(driver) 40 V

Driver Collector Current (Note 1) IC(driver) 100 mA

Switch Current ISW 1.5 A

Timing Capacitor (connected to Cap pin) CT 1 nF

Operating Ambient Temperature Range TA 0 to +70 °C

Note 1: Maximum package power dissipation limits must be observed.

ELECTRICAL CHARACTERISTICS

VCC=5.0 V, TA=0°C to 70°C, unless otherwise specified.

AMC34063A

Parameter Symbol Test Conditions Min. Typ. Max. Units

OSCILLATOR

Frequency fosc VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C 24 33 42 KHz

Charge Current Ichg VCC = 5.0 V to 40 V, TA = 25°C 24 35 42 µA

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

Discharge to Charge Current Ratio Idischg/Ichg Pin 7 to VCC, TA = 25°C 5.2 6.5 7.5 -

Current Limit Sense Voltage Vsense Ichg = Idischg, TA = 25°C 250 300 350 mV

OUTPUT SWITCH

Saturation Voltage, Darlington Connection VCE(sat) I

SW = 1.0 A, Pins 1, 8 connected - 1.0 1.3 V

Saturation Voltage VCE(sat) ISW = 1.0 A, Rpin 8 =82 Ω to VCC,

Forced β = 20 - 0.45 0.7 V

DC Current Gain hFE ISW = 1.0 A, VCE = 5.0 V, TA = 25°C 50 75 - -

Collector Off─State Current IC(off) V

CE = 40 V - 0.01 100 µA

COMPARATOR

TA = 25°C 1.225 1.25 1.275

Threshold Voltage Vth TA =0°C to 70°C 1.21 - 1.29 V

Threshold Voltage Line Regulation Regline V

CC = 3.0 V to 40 V - 1.4 5.0 mV

Input Bias Current IIB V

FB = 0 V - -20 -400 nA

TOTAL DEVICE

Supply current ICC

VCC = 5.0 V to 40 V,

CT = 1.0nF, Pin 7 = VCC,

VFB > Vth, Pin 2= GND, remaining

pins open

- - 4.0 mA

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Copyright  2002, ADD Microtech Corp. 4 www.addmtek.com

CHARACTERIZATION CURVES

SE pin (PIN#2) waveform

on 5V step down converter

VCC = 25V, 500mA load

CT = 470pF

Cap pin (PIN#3 ) waveform

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

CT = 1nF

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

CT = 1nF

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

CT = 1nF

23.3V

- 0.8V

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Copyright  2002, ADD Microtech Corp. 5 www.addmtek.com

Figure 1 – Step-Up Converter Application Circuits

170uH

L

1.25V

Reference

Oscillator

28V/175mA

V

OUT

330uF

4

1500pF

3

C

T

2

Q1

1

Q2 Q

Isen

2.2K

5

47K

6

100uF

12V

V

IN

180

R

7

S

8

0.22

Rsc

Figure 2 – Step-Down Converter Application Circuit

Oscillator

1.25V

Reference

C

T

V

OUT

5V/500mA

470uF

4

470pF

3

220uH

L

1N5819

2

Q1

1

Q2 Q

V

IN

5

3.6K

6

1.2K

100uF

25V

Isen

R

7

S

8

Rsc

0.33

R1

R2

R1

R2

Co

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Copyright  2002, ADD Microtech Corp. 6 www.addmtek.com

Figure 3 – Voltage Inverting Converters

Note: For step-up, step-down or voltage inverting applications requiring peak current greater than

1.5A, external boost current circuitry by NPN or PNP transistors can be used.

1.25V

Reference

C

T

1500pF

-12V/100mA

V

OUT

1000uF

4

3

L

1N5819

88uH

2

1

Q2

Q1

V

IN

3.6K

5

6

1.2K

4.5V to 6.0V

100uF

Ipk

Oscillator

R

7

QS

8

0.24

Rsc

8.2K

953

R1

R2

Co

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

Typical Design Reference Table:

Calculation Step-Down Step-Up Voltage-Inverting

ton/toff Vout + VF

Vin(min) − Vsat− Vout Vout + VF − Vin(min)

Vin(min) − Vsat !Vout! + VF

Vin − Vsat

ton + toff 1

f 1

f

toff ton + toff

ton/tof f + 1 ton + toff

ton/tof f + 1

ton (ton + toff) − toff (ton + toff) − toff (ton + toff) − toff

CT 4.0 × 10-5 ton 4.0 × 10-5 ton 4.0 × 10-5 ton

Ipk(switch) 2Iout(max) 2Iout(max) (ton/toff + 1) 2Iout(max) (ton/toff + 1)

RSC 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch)

L(min) ((Vin(min) − Vsat− Vout)

Ipk(switch)

)

ton(max)

(

(Vin(min) − Vsat)

Ipk(switch)

)

ton(max)

(

(Vin(min) − Vsat)

Ipk(switch)

)

ton(max)

CO Ipk(switch)( ton + toff)

8Vripple(pp) 9 Iout ton

Vripple(pp)

9 Iout ton

Vripple(pp)

VF: Forward Voltage drop of the output rectifier

Vsat: Saturation voltage of the output switch.

The following power supply characteristics must be chosen:

Vin - Nominal input voltage

V

out - Desired output voltage, !Vout! = 1.25(1 + R1/R2)

I

out - Desired output current.

f

min – Minimum desired output switching frequency at the selected values of Vin and IO

V

ripple(pp) – Desired peak – to – peak output ripple voltage.

Application concerns:

To get the best regulation performance, Low ESR capacitors at Vout are suggested.

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

8-Pin Plastic DIP

INCHES MILLIMETERS

MIN TYP MAX MIN TYP MAX

A 0.355 0.365 0.400 9.02 9.27 10.16

B 0.240 0.250 0.280 6.10 6.35 7.11

C - - 0.210 - - 5.33

D - 0.018 - - 0.46 -

F - 0.060 - - 1.52 -

G - 0.100 - - 2.54 -

H 0.050 - 0.090 1.27 - 2.29

J 0.008 - 0.015 0.20 - 0.38

K 0.115 0.130 0.150 2.92 3.30 3.81

L 0.300 BSC. 7.62 BSC.

M - 7º 15º - 7º 15º

Note: For 8 -pin Pl astic package, 60 units pe r tube

8-Pin Plastic S.O.I.C.

INCHES MILLIMETERS

MIN TYP MAX MIN TYP MAX

A 0.183 - 0.202 4.65 - 5.13

B 0.144 - 0.163 3.66 - 4.14

C 0.068 - 0.074 1.73 - 1.88

D 0.010 - 0.020 0.25 - 0.51

F 0.015 - 0.035 0.38 - 0.89

G 0.050 BSC 1.27 BSC

J 0.007 - 0.010 0.19 - 0.25

K 0.005 - 0.010 0.13 - 0.25

L 0.189 - 0.205 4.80 - 5.21

M - - 8º - - 8º

P 0.228 - 0.244 5.79 - 6.20

1

B

5

4

8

C

K

F

H G D

A

L

M

J

SEATING PLAN

A

D

F

P

B

K

C

M

L

J

G

SEATING PLANE

AMC DOC. #: AMC34063_C AMC34063A

November 2002 DC - DC CONVERTER CONTROL CIRCUITS

IMPORTANT NOTICE

ADD Microtech (ADDM) reserves the right to make changes to its products or to discontinue any integrated circuit

product or service without notice, and advises its customers to obtain the latest version of relevant information to

verify, before placing orders, that the information being relied on is current.

A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe

property or environmental damage. ADDM integrated circuit products are not designed, intended, authorized, or

warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of

ADDM products in such applications is understood to be fully at the risk of the customer. In order to minimize

risks associated with the customer’s applications, the customer should provide adequate design and operating

safeguards.

ADDM assumes to no liability to customer product design or application support. ADDM warrants the performance

of its products to the specifications applicable at the time of sale.

U.S. Asia Pacific

ADD Microtech Inc.

492 Altamont Drive

Milpitas, CA 95035

ADD Microtech Corp

3F, 132, Sec. 4, Chung Hsiao E. Rd.,

Taipei, Taiwan

TEL: (408) 9410420 TEL: 2-27760166

FAX: (408) 9410864 FAX: 2-27764208