LM1575, LM2575-N, LM2575HV
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SNVS106E –MAY 1999–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V
version, and VIN = 30V for the 15V version. ILOAD = 200 mA.
LM2575-XX
LM2575HV-XX
LM1575-XX
Units
(Limits)
Symbol
Parameter
Conditions
Typ
(1)
(2)
Limit
Limit
DEVICE PARAMETERS
Ib
Feedback Bias Current
VOUT = 5V (Adjustable Version Only)
50
52
100/500
100/500
nA
kHz
(3)
fO
Oscillator Frequency
See
47/43
58/62
47/42
58/63
kHz(Min)
kHz(Max)
V
(4)
VSAT
DC
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
IOUT = 1A
0.9
98
1.2/1.4
1.2/1.4
V(Max)
%
(5)
See
93
93
%(Min)
A
(4)(3)
ICL
Peak Current
2.2
1.7/1.3
3.0/3.2
2
1.7/1.3
3.0/3.2
2
A(Min)
A(Max)
mA(Max)
mA
IL
Output Leakage
Current
Output = 0V
Output = −1V
Output = −1V
7.5
5
(6)(7)
30
30
10
mA(Max)
mA
(6)
IQ
Quiescent Current
See
10/12
mA(Max)
μA
ISTBY
Standby Quiescent
Current
ON /OFF Pin = 5V (OFF)
50
200/500
200
μA(Max)
(8)
(9)
θJA
θJA
θJC
θJA
θJA
θJA
Thermal Resistance
TO-220 Package, Junction to Ambient
TO-220 Package, Junction to Ambient
TO-220 Package, Junction to Case
CDIP Package, Junction to Ambient
SOIC Package, Junction to Ambient
65
45
2
85
100
37
(10)
°C/W
(10)
DDPAK/TO-263 Package, Junction to Ambient
(11)
(1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to
calculate Average Outgoing Quality Level, and all are 100% production tested.
(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control
(SQC) methods.
(3) The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated
output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power
dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
(4) Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
(5) Feedback (pin 4) removed from output and connected to 0V.
(6) Feedback (pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V
versions, to force the output transistor OFF.
(7) VIN = 40V (60V for the high voltage version).
(8) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a
socket, or on a PC board with minimum copper area.
(9) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads
soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads.
(10) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper
area will lower thermal resistance further. See thermal model in Switchers made Simple software.
(11) If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally
connected to the package: Using 0.5 square inches of copper area, θJA is 50°C/W; with 1 square inch of copper area, θJA is 37°C/W;
and with 1.6 or more square inches of copper area, θJA is 32°C/W.
Copyright © 1999–2013, Texas Instruments Incorporated
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