MC34063A, MC33063A
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V, T
A
= T
low
to T
high
[Note 3.], unless otherwise specified.)
Characteristics
OSCILLATOR
Frequency (V
Pin 5
= 0 V, C
T
= 1.0 nF, T
A
= 25°C)
Charge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Discharge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Discharge to Charge Current Ratio (Pin 7 to V
CC
, T
A
= 25°C)
Current Limit Sense Voltage (I
chg
= I
dischg
, T
A
= 25°C)
OUTPUT SWITCH
(Note 4.)
Saturation Voltage, Darlington Connection
( I
SW
= 1.0 A, Pins 1, 8 connected)
Saturation Voltage (Note 5.)
(I
SW
= 1.0 A, R
Pin 8
= 82
Ω
to V
CC
, Forced
β
]
20)
DC Current Gain (I
SW
= 1.0 A, V
CE
= 5.0 V, T
A
= 25°C)
Collector Off–State Current (V
CE
= 40 V)
COMPARATOR
Threshold Voltage
T
A
= 25°C
T
A
= T
low
to T
high
Threshold Voltage Line Regulation (V
CC
= 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Input Bias Current (V
in
= 0 V)
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
V
th
1.225
1.21
Reg
line
–
–
I
IB
–
1.4
1.4
–20
5.0
6.0
–400
nA
1.25
–
1.275
1.29
mV
V
V
CE(sat)
V
CE(sat)
h
FE
I
C(off)
–
–
50
–
1.0
0.45
75
0.01
1.3
0.7
–
100
V
V
–
µA
f
osc
I
chg
I
dischg
I
dischg
/I
chg
V
ipk(sense)
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
kHz
µA
µA
–
mV
Symbol
Min
Typ
Max
Unit
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:
IC output
Forced
b
of output switch :
w
10
IC driver – 7.0 mA *
* The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
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