DEVICE PARAMETERS, FIXED and ADJUSTABLE REGULATORS
f
O
Oscillator Frequency
50
52
100/
500
nA
kHz
kHz(min)
kHz(max)
V
V(max)
%
%(max)
A
A(min)
A(max)
mA(max)
mA
mA(max)
mA
mA(max)
µA
µA(max)
°C/W
47/
42
58/
63
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
I
OUT
= 1A (
Note 4
)
(
Note 5
)
Peak Current, t
ON
≤
3µs (
Note 4
)
0.9
1.2/
1.4
98
93
2.2
1.7/
1.3
3.0/
3.2
2
75
30
5
10
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
50
200
65
45
2
85
100
1.4
1.2
4
30
ON /OFF Pin = 0V (ON)
0.01
10
2.2/
2.4
1.0/
0.8
V
SAT
DC
I
CL
I
L
Output Leakage Current
V
IN
= 40V, (
Note 6
),
(
Note 6
)
(
Note 6
)
Output = 0V
Output = –1V
Output = –1V
I
Q
I
STBY
Quiescent Current
T Package, Junction to Ambient (
Note 7
)
θ
JA
Thermal Resistance
T Package, Junction to Ambient (
Note 8
)
θ
JA
θ
JC
T Package, Junction to Case
N Package, Junction to Ambient (
Note 9
)
θ
JA
WM Package, Junction to Ambient (
Note 9
)
θ
JA
ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS
Test Circuit Figure 1
V
IH
V
IL
I
IH
I
IL
Notes:
ON/OFF Pin Logic
Input Level
ON/OFF Pin Logic
Current
V
OUT
= 0V
V
OUT
= 5V
ON /OFF Pin = 5V (OFF)
V(min)
V(max)
µA
µA(max)
µA
µA(max)
1. Absolute Maximum Rating 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 (standard type face) and at
temperature extremes (bold type face).
All room temperature limits are100%
production tested. All limits at
temperature extreme
are guaranteed via testing.
3. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2575/LM1575 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of Electrical
Characteristics.
4. Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output.
5. Feedback (pin 4) removed from output and connected to 0V.
6. Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF.
7. Junction to ambient thermal resistance (no external heat sink) for the 5-pin TO-220 package mounted vertically, with 1/2" leads in a socket, or on PC
board with minimum copper area.
8. Junction to ambient thermal resistance (no external heat sink) for the 5-pin TO-220 package mounted vertically, with 1/4" leads soldered to PC
board containing approximately 4 square inches of copper area surrounding the leads.
9. Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper will lower
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Programming Basics
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