Motorola MC34063AMEL, MC34063AML1, MC34063AML2, MC34063AP1, MC34063AD Datasheet

...

   

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.

• 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

Order this document by MC34063A/D

 

DC–to–DC CONVERTER

CONTROL CIRCUITS

SEMICONDUCTOR

TECHNICAL DATA

P, P1 SUFFIX

PLASTIC PACKAGE

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

Representative Schematic Diagram

Drive

Collector

SQ R

Comparator

+ –

(Bottom View)

100

1.25 V

Reference

Regulator

Sense

Comparator

Inverting

Input

This device contains 51 active transistors.

Oscillator

MOTOROLA ANALOG IC DEVICE DATA

Switch Collector

Switch Emitter

Timing Capacitor

Gnd

PIN CONNECTIONS

Switch

Collector

Switch

Emitter

Timing

Capacitor

Gnd

(Top View)

Driver

Collector

Ipk Sense

Comparator Inverting Input

ORDERING INFORMATION

Operating

Device

MC33063AD MC33063AP1 MC33063AVD MC33063AVP Plastic DIP MC34063AD SO–8

MC34063AP1

 Motorola, Inc. 1996 Rev 5

Temperature Range

TA = – 40° to +85°C

TA = –40° to +125°C

TA = 0° to +70°C

Package

SO–8

Plastic DIP

SO–8

Plastic DIP

MC34063A MC33063A

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 Power Dissipation and Thermal Characteristics

Plastic Package, P, P1 Suffix

TA = 25°C P Thermal Resistance R

SOIC Package, D Suffix

TA = 25°C P Thermal Resistance R

Operating Junction Temperature T Operating Ambient Temperature Range T

MC34063A 0 to +70 MC33063AV –40 to +125 MC33063A –40 to +85

Storage Temperature Range T

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

2.ESD data available upon request.

IR C(switch) E(switch)

CE(switch)

C(driver)

θJA

stg

–0.3 to +40 Vdc

–65 to +150 °C

40 Vdc

40 Vdc 40 Vdc 40 Vdc 40 Vdc

100 mA

1.5 A

1.25 W 100 °C/W

625 W 160 °C/W

+150 °C

°C

ELECTRICAL CHARACTERISTICS (V

= 5.0 V, TA = T

low

to T

[Note 3], unless otherwise specified.)

high

Characteristics 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 µA

140 220 260 µA

5.2 6.5 7.5 –

250 300 350 mV

OUTPUT SWITCH (Note 4)

Saturation Voltage, Darlington Connection (Note 5)

(ISW = 1.0 A, Pins 1, 8 connected)

Saturation Voltage, Darlington Connection

(ISW = 1.0 A, R

= 82 Ω to VCC, Forced β ] 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

NOTES: 3. T

= 0°C for MC34063A, –40°C for MC33063A, AV T

low

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

5.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 µs 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:

Forcedbof output switch :

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

ICoutput

ICdriver – 7.0 mA *

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

high

CE(sat)

C(off)

– 1.0 1.3 V

– 0.45 0.7 V

50 75 – –

– 0.01 100 µA

MOTOROLA ANALOG IC DEVICE DATA

MC34063A MC33063A

ELECTRICAL CHARACTERISTICS (continued) (V

= 5.0 V, TA = T

low

to T

[Note 3], unless otherwise specified.)

high

Characteristics UnitMaxTypMinSymbol

COMPARATOR

Threshold Voltage

TA = 25°C TA = T

low

to T

high

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

MC33063A, MC34063A MC33363A V

Input Bias Current (Vin = 0 V) I

Reg

1.225

1.25–1.275

1.21

line

– –

1.4

– –20 –400 nA

TOTAL DEVICE

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

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

Pin 5

NOTES: 3. T

= 0°C for MC34063A, –40°C for MC33063A, AV T

low

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

Forcedbof output switch :

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

ICoutput

ICdriver – 7.0 mA *

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

high

– – 4.0 mA

1.29 mV

5.0

6.0

Figure 1. Output Switch On–Off Time versus

Oscillator Timing Capacitor

1000

VCC = 5.0 V

500

Pin 7 = V

200 100

50 20

5.0

, OUTPUT SWITCH ON-OFF TIME ( s)

2.0

on–off

1.0

0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10

Pin 5 = Gnd

TA = 25

CT, OSCILLAT OR TIMING CAPACITOR (nF)

off

, OSCILLAT OR VOLTAGE (V)

VCC = 5.0 V

OSC

Pin 7 = V

Pin 2 = Gnd

Figure 2. Timing Capacitor Waveform

Pins 1, 5, 8 = Open

CT = 1.0 nF

TA = 25

10 µs/DIV

200 mV/DIV

MOTOROLA ANALOG IC DEVICE DATA

Figure 3. Emitter Follower Configuration Output

Saturation V oltage versus Emitter Current

1.8

1.7

1.6

1.5

1.4

1.3

, SATURATION VOLTAGE (V)

1.2

1.1

CE(sat)

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 TA = 25 (See Note 4)

MC34063A MC33063A

Figure 4. Common Emitter Configuration Output

1.1

1.0

0.9

0.8

0.7

0.6

VCC = 5.0 V Pin 7 = V

0.5 Pins 2, 3, 5 = Gnd

0.4

, SATURATION VOLTAGE (V)

TA = 25

0.3

(See Note 4)

0.2

CE(sat)

0.1

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

Switch Saturation Voltage versus

Collector Current

Darlington Connection

IC, COLLECTOR CURRENT(A)

Forced

= 20

Figure 5. Current Limit Sense V oltage

versus T emperature

400 380

VCC = 5.0 V

360

= 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

NOTE: 4.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

dischg

TA, AMBIENT TEMPERATURE (°C)

, SUPPLY CURRENT (mA)

Figure 6. Standby Supply Current versus

Supply V oltage

3.6

3.2

2.8

2.4

2.0

1.6

1.2

0.8

0.4

0 5.0 10 15 20 25 30 35 40

VCC, SUPPLY VOLTAGE (V)

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

MOTOROLA ANALOG IC DEVICE DATA

+ 8 hidden pages