Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Total Supply Voltage
Collector Output to Ground
Emitter Output to Ground (Note 2)
Power Dissipation (Note 3)
Output Current
Storage Temperature
Lead Temperature
(soldering, 10 seconds)
Maximum Junction Temperature
50V
−0.3V to +50V
−1V to +50V
Internally limited
750 mA
−65˚C to +150˚C
260˚C
150˚C
ESD Tolerance (Note 4)
2 kV
Operating Ratings
Ambient Temperature Range
LM1578A
LM2578A
LM3578A
Junction Temperature Range
LM1578A
LM2578A
LM3578A
−55˚C
≤
T
A
≤+125˚C
−40˚C
≤
T
A
≤+85˚C
0˚C
≤
T
A
≤+70˚C
−55˚C
≤
T
J
≤+150˚C
−40˚C
≤
T
J
≤+125˚C
0˚C
≤
T
J
≤+125˚C
Electrical Characteristics
These specifications apply for 2V
≤
V
IN
≤
40V (2.2V
≤
V
IN
≤
40V for T
J
≤
−25˚C), timing capacitor C
T
= 3900 pF, and 25%
≤
duty cycle
≤
75%, unless otherwise specified. Values in standard typeface are for T
J
= 25˚C; values in
boldface type
apply for
operation over the specified operating junction temperature range.
LM1578A
Symbol
Parameter
Conditions
Typical
(Note 5)
OSCILLATOR
f
OSC
Frequency
20
22.4
17.6
∆f
OSC
/∆T
Frequency Drift with
Temperature
Amplitude
REFERENCE/COMPARATOR
(Note 8)
V
R
Input Reference
Voltage
∆V
R
/∆V
IN
I
INV
Input Reference Volt-
age Line Regulation
Inverting Input
Current
Level Shift Accuracy
∆V
R
/∆t
Input Reference
Voltage Long Term
Stability
OUTPUT
V
C
(sat)
V
E
(sat)
I
CES
BV
CEO(SUS)
Collector Saturation
Voltage
Emitter Saturation
Voltage
Collector Leakage
Current
Collector-Emitter
Sustaining Voltage
I
C
= 750 mA pulsed, Emitter
grounded
I
O
= 80 mA pulsed,
V
IN
= V
C
= 40V
V
IN
= V
CE
= 40V, Emitter
grounded, Output OFF
I
SUST
= 0.2A (pulsed), V
IN
= 0
0.7
0.85/1.2
1.4
1.6/2.1
0.1
50/100
60
50
50
200/250
1.7/2.0
0.90/1.2
V
V (max)
V
V (max)
µA
µA (max)
V
V (min)
Level Shift Current = 1 mA
1.0
5/8
100
10/13
%
% (max)
ppm/1000h
I
1
= I
2
= 0 mA and
I
1
= I
2
= 1 mA
±
1% (Note 9)
I
1
= I
2
= 0 mA and
I
1
= I
2
= 1 mA
±
1% (Note 9)
I
1
= I
2
= 0 mA, duty cycle = 25%
1.0
1.035/1.050
0.965/0.950
0.003
0.01/0.02
0.5
0.01/0.02
0.950/0.930
V
1.050/1.070 V (max)
V (min)
%/V
%/V (max)
µA
550
mV
p-p
−0.13
24
16
kHz
kHz (max)
kHz (min)
%/˚C
Limit
(Note 6)
(Note 11)
LM2578A/
LM3578A
Limit
(Note 7)
Units
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