LM2576, LM2576HV
SNVS107C –JUNE 1999–REVISED APRIL 2013
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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 = 500 mA.
LM2576-XX
Units
LM2576HV-XX
Symbol
Parameter
Conditions
(Limits)
(1)
Typ
Limit
DEVICE PARAMETERS
Ib
Feedback Bias Current
VOUT = 5V (Adjustable Version Only)
50
52
100/500
nA
(2)
fO
Oscillator Frequency
See
kHz
47/42
58/63
kHz (Min)
kHz (Max)
(3)
VSAT
DC
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
IOUT = 3A
1.4
98
V
1.8/2.0
V(Max)
(4)
See
%
%(Min)
93
(3)(2)
ICL
See
5.8
A
4.2/3.5
6.9/7.5
A(Min)
A(Max)
IL
Output Leakage Current
Quiescent Current
Output = 0V
Output = −1V
Output = −1V
2
mA(Max)
mA
mA(Max)
7.5
5
(5)(6)
30
(5)
IQ
See
mA
10
mA(Max)
ISTBY
Standby Quiescent
Current
ON /OFF Pin = 5V (OFF)
50
μA
μA(Max)
200
(7)
θJA
θJA
θJC
θJA
Thermal Resistance
T Package, Junction to Ambient
T Package, Junction to Ambient
T Package, Junction to Case
S Package, Junction to Ambient
65
45
2
(8)
°C/W
(9)
50
ON /OFF CONTROL Test Circuit Figure 21 and Figure 22
VIH
VIL
IIH
ON /OFF Pin
Logic Input Level
VOUT = 0V
1.4
1.2
12
2.2/2.4
1.0/0.8
V(Min)
V(Max)
VOUT = Nominal Output Voltage
ON /OFF Pin = 5V (OFF)
ON /OFF Pin Input
Current
μA
μA(Max)
30
10
IIL
ON /OFF Pin = 0V (ON)
0
μA
μA(Max)
(1) 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.
(2) The oscillator frequency reduces to approximately 11 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%.
(3) Output pin sourcing current. No diode, inductor or capacitor connected to output.
(4) Feedback pin removed from output and connected to 0V.
(5) Feedback pin 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.
(6) VIN = 40V (60V for high voltage version).
(7) 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.
(8) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ¼ inch leads
soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads.
(9) 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.
6
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