SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
LM2596-ADJ Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range
LM2596-ADJ
Symbol
Parameter
(3)
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
FB
Test Circuit
4.5V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
V
OUT
programmed for 3V. Circuit of
1.230
1.193/1.180
1.267/1.280
73
V
V(min)
V(max)
%
Feedback Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 12V, V
OUT
= 3V, I
LOAD
= 3A
Typical numbers are at 25°C and represent the most likely norm.
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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the
test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
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 and V
IN
= 24V for the
12V version. I
LOAD
= 500 mA
LM2596-XX
Symbol
Parameter
Conditions
Typ
(1)
Limit
(2)
Units
(Limits)
DEVICE PARAMETERS
I
b
f
O
Feedback Bias Current
Oscillator Frequency
Adjustable Version Only, V
FB
= 1.3V
See
(3)
10
50/100
150
127/110
173/173
nA
nA (max)
kHz
kHz(min)
kHz(max)
V
1.4/1.5
V(max)
%
A
3.6/3.4
6.9/7.5
A(min)
A(max)
μA(max)
mA
30
mA(max)
mA
10
mA(max)
V
SAT
DC
I
CL
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
I
OUT
= 3A
See
See
(5)
(6)
(4) (5)
1.16
100
0
Peak Current
(4) (5)
4.5
I
L
Output Leakage Current
Output = 0V
(4) (6)
(7)
50
2
5
Output =
−1V
I
Q
Quiescent Current
See
(6)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
4
Typical numbers are at 25°C and represent the most likely norm.
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 ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
The switching frequency is reduced when the second stage current limit is activated.
No diode, inductor or capacitor connected to output pin.
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force
the output transistor switch OFF.
V
IN
= 40V.
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