MC34063A MC33063A

3

MOTOROLA ANALOG IC DEVICE DATA

Characteristics

Unit

Max

Typ

Min

Symbol

COMPARATOR

Threshold Voltage

TA = 25°C

TA = Tlow to Thigh

Vth

1.225

1.21

1.25

–

1.275

1.29

V

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

MC33063A, MC34063A

MC33363AV

Regline

–

–

1.4

1.4

5.0

6.0

mV

Input Bias Current (Vin = 0 V)

IIB

–

–20

– 400

nA

TOTAL DEVICE

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

VPin 5 > Vth, Pin 2 = Gnd, remaining pins open)

ICC

–

–

4.0

mA

NOTES: 3. Tlow = 0°C for MC34063A, – 40°C for MC33063A, AV

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

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:

*The 100

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

Forced

b of output switch :

IC output

IC driver – 7.0 mA *

w 10

ton

VCC = 5.0 V

Pin 7 = VCC

Pin 5 = Gnd

TA = 25°C

toff

Figure 1. Output Switch On–Off Time versus

Oscillator Timing Capacitor

Figure 2. Timing Capacitor Waveform

0.01 0.02

0.05

0.1

0.2

0.5 1.0

2.0

5.0 10

CT, OSCILLATOR TIMING CAPACITOR (nF)

10

µs/DIV

VCC = 5.0 V

Pin 7 = VCC

Pin 2 = Gnd

Pins 1, 5, 8 = Open

CT = 1.0 nF

TA = 25°C

1000

500

200

100

50

20

10

5.0

2.0

1.0