LM2576 Series
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over full Operating Temperature Range.
Unless otherwise specified, V
IN
=12V for the 3.3V, 5V, and Adjustable version, V
IN
=25V for the 12V version, and V
IN
=30V for the 15V
version, , I
LOAD
=500mA.
Symbol
Parameter
Conditions
LM2576-XX
LM2576HV-XX
Typ
DEVICE PARAMETERS
I
b
f
O
Feedback Bias Current
Oscillator Frequency
V
OUT
=5V (Adjustable Version Only)
(Note 8)
50
52
100/500
47/42
58/63
1.8/2.0
93
4.2/3.5
6.9/7.5
2
30
10
200
nA
kHz
kHz(Min)
kHz(Max)
V
V(Max)
%
%(Min)
A
A(Min)
A(Max)
mA(Max)
mA
mA(Max)
mA
mA(Max)
µA
µA(Max)
Limit
(Note 2)
Units
(Limits)
V
SAT
DC
I
CL
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
I
OUT
=3A (Note 4)
(Note 5)
(Notes 4, 8)
1.4
98
5.8
I
L
Output Leakage Current
Output = 0V
I
Q
I
STBY
Quiescent Current
Standby Quiescent Current
(Notes 6, 7):
Output = -1V
Output = -1V
7.5
5
50
(Note 6)
___
ON/OFF Pin = 5V (OFF)
___
ON/OFF CONTROL
V
IH
__
ON/OFF Pin
V
IL
Logic Input Level
I
IH
__
ON/OFF Pin Input
Current
I
IL
V
OUT
= 0V
V
OUT
= Nominal Output Voltage
__
ON/OFF Pin = 5V (OFF)
__
ON/OFF Pin = 0V (ON)
1.4
1.2
12
0
2.2/2.4
1.0/0.8
30
10
V(Min)
V(Max)
µA
µA(Max)
µA
µA(Max)
Note
Note
Note
Note
Note
Note
Note
Note
1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
For guaranteed specifications and test conditions, see the Electrical Characteristics.
2:
All limits guaranteed at room temperature (standa rd type face) and at temperature extremes (bold
type face).
3:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system
performance. When the
LM2576/ LM2576HV
is used as shown in the
Figure 2
test circuit, system performance will be a
shown in system parameters section of Electrical Characteristics.
4:
Output pin sourcing current. No diode, inductor or capacitor connected to output.
5:
Feedback pin removed from output and connected to 0V.
6:
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.
7:
V
IN
=40V (60V for high voltage version).
8:
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 protections feature lowers the
average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
TIGER ELECTRONICS CO.,LTD
5
TGS [ Tiger Electronic Co.,Ltd ]
