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LM2574 Datasheet(PDF) 6 Page - Texas Instruments

Part No. LM2574
Description  LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM2574 Datasheet(HTML) 6 Page - Texas Instruments

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LM2574, LM2574HV
SNVS104C – JUNE 1999 – REVISED APRIL 2013
www.ti.com
All Output Voltage Versions Electrical Characteristics
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 = 100 mA.
Symbol
Parameter
Conditions
LM2574-XX
Units
LM2574HV-XX
(Limits)
Typ
Limit (1)
DEVICE PARAMETERS
Ib
Feedback Bias
Adjustable Version Only, VOUT = 5V
50
100/500
nA
Current
fO
Oscillator Frequency
See (2)
52
kHz
47/42
kHz(Min)
58/63
kHz(Max)
VSAT
Saturation Voltage
IOUT = 0.5A
(3)
0.9
V
1.2/1.4
V(max)
DC
Max Duty Cycle (ON)
See (4)
98
%
93
%(Min)
ICL
Current Limit
Peak Current (3)(2)
1.0
A
0.7/0.65
A(Min)
1.6/1.8
A(Max)
IL
Current
Output = 0V
2
mA(Max)
Output Leakage
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
P Package, Junction to Ambient (7)
92
θJA
P Package, Junction to Ambient (8)
72
°C/W
θJA
NPA Package, Junction to Ambient (7)
10
θJA
NPA Package, Junction to Ambient (8)
2 78
ON /OFF CONTROL Test Circuit Figure 24
VIH
ON /OFF Pin Logic
VOUT = 0V
1.4
2.2/2.4
V(Min)
Input Level
VIL
VOUT = Nominal Output Voltage
1.2
1.0/0.8
V(Max)
IH
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. All limits are used to calculate Average Outgoing Quality Level.
(2)
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%.Figure 9
(3)
Output pin sourcing current. No diode, inductor or capacitor connected to output pin.
(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 with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional
copper area will lower thermal resistance further. See Application Hints in this data sheet and the thermal model in Switchers Made
Simple software.
(8)
Junction to ambient thermal resistance with approximately 4 square inches of 1 oz. (0.0014 in. thick) printed circuit board copper
surrounding the leads. Additional copper area will lower thermal resistance further (See Note 7)
6
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM2574 LM2574HV


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