MC34063A MC33063A
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (V
CC
= 5.0 V, T
A
= T
low
to T
high
[Note 3], unless otherwise specified.)
Characteristics UnitMaxTypMinSymbol
COMPARATOR
Threshold Voltage
T
A
= 25°C
T
A
= T
low
to T
high
V
th
1.225
1.21
1.25
–
1.275
1.29
V
Threshold Voltage Line Regulation (V
CC
= 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Reg
line
–
–
1.4
1.4
5.0
6.0
mV
Input Bias Current (V
in
= 0 V) I
IB
– –20 –400 nA
TOTAL DEVICE
Supply Current (V
CC
= 5.0 V to 40 V, C
T
= 1.0 nF, Pin 7 = V
CC
,
V
Pin
5
> V
th
, Pin 2 = Gnd, remaining pins open)
I
CC
– – 4.0 mA
NOTES: 3. T
low
= 0°C for MC34063A, –40°C for MC33063A, AV T
high
= +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 :
I
C
output
I
C
driver – 7.0 mA *
w
10
t
on
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 5 = Gnd
T
A
= 25
°
C
t
off
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
C
T
, OSCILLATOR TIMING CAPACITOR (nF)
, OUTPUT SWITCH ON-OFF TIME ( s)
on–off
µ
t
10
µ
s/DIV
, OSCILLATOR VOLTAGE (V)
OSC
200 mV/DIV
V
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
C
T
= 1.0 nF
T
A
= 25
°
C
1000
500
200
100
50
20
10
5.0
2.0
1.0
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