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LM2576S-12 Datenblatt(PDF) 6 Page - Texas Instruments

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Teilenummer LM2576S-12
Bauteilbeschribung  SIMPLE SWITCHER짰 3A Step-Down Voltage Regulator
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM2576, LM2576HV
SNVS107C – JUNE 1999 – REVISED APRIL 2013
www.ti.com
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)
Typ
Limit (1)
DEVICE PARAMETERS
Ib
Feedback Bias Current
VOUT = 5V (Adjustable Version Only)
50
100/500
nA
fO
Oscillator Frequency
See (2)
52
kHz
47/42
kHz (Min)
58/63
kHz (Max)
VSAT
Saturation Voltage
IOUT = 3A
(3)
1.4
V
1.8/2.0
V(Max)
DC
Max Duty Cycle (ON)
See (4)
98
%
93
%(Min)
ICL
Current Limit
See (3)(2)
5.8
A
4.2/3.5
A(Min)
6.9/7.5
A(Max)
IL
Output Leakage Current
Output = 0V
2
mA(Max)
Output =
−1V
7.5
mA
Output =
−1V (5)(6)
30
mA(Max)
IQ
Quiescent Current
See (5)
5
mA
10
mA(Max)
ISTBY
Standby Quiescent
ON /OFF Pin = 5V (OFF)
50
μA
Current
200
μA(Max)
θJA
Thermal Resistance
T Package, Junction to Ambient (7)
65
θJA
T Package, Junction to Ambient (8)
45
°C/W
θJC
T Package, Junction to Case
2
θJA
S Package, Junction to Ambient (9)
50
ON /OFF CONTROL Test Circuit Figure 21 and Figure 22
VIH
ON /OFF Pin
VOUT = 0V
1.4
2.2/2.4
V(Min)
Logic Input Level
VIL
VOUT = Nominal Output Voltage
1.2
1.0/0.8
V(Max)
IIH
ON /OFF Pin Input
ON /OFF Pin = 5V (OFF)
12
μA
Current
30
μA(Max)
IIL
ON /OFF Pin = 0V (ON)
0
μA
10
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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Product Folder Links: LM2576 LM2576HV


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