3.0A, 15V, Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS / Device Parameters
LM2596
(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12
V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values Tj = 25°C, for min/max
values Tj is the operating junction temperature range that applies [Note 2], unless otherwise noted.)
10
0
127
110
150
50
100
173
173
1.16
0
1.4
1.5
-
3.6
3.4
100
4.5
6.9
7.5
50
30
-
10
0
-
2
5
0
0
2
-
0
2.0
2.0
2
V
LOGIC
= 2.5V (Regulator OFF)
V
LOGIC
= 0.5V (Regulator ON)
5
0.02
1.3
1.3
250
0.6
0.6
-
-
15
5.0
0
1. External components such as the catch diode, inductor, input and output capacitors can affect switching
regulator system performance.
When the LM2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in system
parameters section .
2. Tested junction temperature range for the LM2596 : T
LOW
= –0°C T
HIGH
= +125°C
3. 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 dissipation of the IC by lowering the minimum duty cycle from 5% down to
approximately 2%.
4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
5. Feedback (Pin 4) removed from output and connected to 0 V.
6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0V ersions, and
+25 V for the 12 V and15 V versions, to force the output transistor “off”.
7. Vin = 40 V.
HTC
4
Oct 2004 - Rev 0
ETC [ ETC ]
