3.0A, 150kHz, Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS
/ Device Parameters
LM2596
(Unless otherwise specified, Vin = 12V for the 3.3V, 5.0V, and Adjustable version, Vin = 25V for the 12V versio
ILoad = 500 mA. For typical values Tj = 25°C, for min/max values TJ is the operating junction temperature ran
that applies [Note 2], unless otherwise noted.)
Characteristics
All Output Voltage Versions
Feedback Bias Current (Vout=5.0V [Adjustable Version Only])
Symbol
Min
TYP
Max
Unit
I
b
T
J
=25℃
11.52
12
12.48 nA
T
J
= 0 ~ +125℃
11.4
-
12.6
Oscillator Frequency [Note 3]
Fosc
T
J
=25℃
kHz
127
150
173
T
J
= 0 ~ +125℃
173
110
-
Saturation Voltage (Iout=3.0A [note 4])
Vsat
T
J
=25℃
V
1.4
-
1.16
T
J
= 0 ~ +125℃
-
-
1.5
%
Max Duty Cycle ("0") [Note 5]
DC
-
100
-
I
CL
Current Limit (Peak Current [Note 3 and 4])
T
J
=25℃
A
3.6
4.5
6.9
T
J
= 0 ~ +125℃
3.4
-
7.5
I
L
Output Leakage Current [Note 6 and 7], T
J
=25℃
mA
50
Output = 0V
-
-
Output = -1.0V
-
2
30
I
Q
Quiescent Current [Note 6]
T
J
=25℃
mA
-
-
5
T
J
= 0 ~ +125℃
-
-
10
I
STBY
Standby Quiescent Current (ON/OFF Pin = 5.0V ("off"))
T
J
=25℃
㎂
200
-
80
T
J
= 0 ~ +125℃
-
-
250
ON/OFF Pin Logic Input Level (Test circuit Figure 2)
V
IH
Vout=0V
T
J
=25℃
2.0
1.3
-
T
J
= 0 ~ +125℃
V
2.0
-
-
V
IL
Vout=Nominal Ouput Voltage
T
J
=25℃
-
1.3
0.6
T
J
= 0 ~ +125℃
-
-
0.6
ON/OFF Pin Input Current (Test Circuit Figure 2)
I
IH
V
LOGIC
= 2.5V (Regulator OFF)
㎂
-
5
15
I
IL
V
LOGIC
= 0.5V (Regulator ON)
-
0.02
5.0
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 TJ2596 : T
LOW
= –40°C T
HIGH
= +125°C
3. The oscillator frequency reduces to approximately 18kHz 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 +12V for the Adjustable, 3.3V, and 5.0V
versions, and '+25 V for the 12V versions, to force the output transistor “off”.C195
7. Vin = 40 V.
HTC
−
4
−
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
