MC34025, MC33025
MAXIMUM RATINGS
Rating
Power Supply Voltage
Output Driver Supply Voltage
Output Current, Source or Sink (Note 1)
DC
Pulsed (0.5
ms)
Current Sense, Soft−Start, Ramp, and Error Amp Inputs
Error Amp Output and Soft−Start Sink Current
Clock and R
T
Output Current
Power Dissipation and Thermal Characteristics
SO−16 Package (Case 751G)
Maximum Power Dissipation @ T
A
= + 25°C
Thermal Resistance, Junction−to−Air
DIP Package (Case 648)
Maximum Power Dissipation @ T
A
= + 25°C
Thermal Resistance, Junction−to−Air
Operating Junction Temperature
Operating Ambient Temperature (Note 2)
MC34025
MC33025
Storage Temperature Range
Symbol
V
CC
V
C
I
O
0.5
2.0
V
in
I
O
I
CO
−0.3 to +7.0
10
5.0
V
mA
mA
Value
30
25
Unit
V
V
A
P
D
R
qJA
P
D
R
qJA
T
J
T
A
T
stg
862
145
1.25
100
+150
0 to +70
−40 to +105
−55 to +150
mW
°C/W
W
°C/W
°C
°C
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, R
T
= 3.65 kW, C
T
= 1.0 nF, for typical values T
A
= + 25°C, for min/max values T
A
is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)
Characteristic
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= + 25°C)
Line Regulation (V
CC
= 10 V to 30 V)
Load Regulation (I
O
= 1.0 mA to 10 mA)
Temperature Stability
Total Output Variation over Line, Load, and Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, T
J
= + 25°C)
Long Term Stability (T
A
= +125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
T
J
= + 25°C
Line (V
CC
= 10 V to 30 V) and Temperature (T
A
= T
low
to T
high
)
Frequency Change with Voltage (V
CC
= 10 V to 30 V)
Frequency Change with Temperature (T
A
= T
low
to T
high
)
Sawtooth Peak Voltage
Sawtooth Valley Voltage
Clock Output Voltage
High State
Low State
kHz
f
osc
Df
osc
/DV
Df
osc
/DT
V
P
V
V
V
OH
V
OL
380
370
−
−
2.6
0.7
3.9
−
400
400
0.2
2.0
2.8
1.0
4.5
2.3
420
430
1.0
−
3.0
1.25
−
2.9
%
%
V
V
V
V
ref
Reg
line
Reg
load
T
S
V
ref
V
n
S
I
SC
5.05
−
−
−
4.95
−
−
−30
5.1
2.0
2.0
0.2
−
50
5.0
−65
5.15
15
15
−
5.25
−
−
−100
V
mV
mV
mV/°C
V
mV
mV
mA
Symbol
Min
Typ
Max
Unit
1. Maximum package power dissipation limits must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T
low
= 0°C for MC34025
T
high
= +70°C for MC34025
T
low
= − 40°C for MC33025
T
high
= +105°C for MC33025
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