SNVS122B – MAY 1999 – REVISED APRIL 2013
LM2595-12 Electrical Characteristics (continued)
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range.
Symbol
Parameter
Conditions
Typ
(1)
LM2595-12
Limit
(2)
Units
(Limits)
η
Efficiency
V
IN
= 25V, I
LOAD
= 1A
90
%
LM2595-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.
Symbol
Parameter
Conditions
Typ
(1)
LM2595-ADJ
Limit
(2)
Units
(Limits)
SYSTEM PARAMETERS
V
FB
(3)
Test Circuit
4.5V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
1A
V
OUT
programmed for 3V. Circuit of
1.230
1.193/1.180
1.267/1.280
78
V
V(min)
V(max)
%
Feedback Voltage
η
(1)
(2)
(3)
Efficiency
V
IN
= 12V, V
OUT
= 3V, I
LOAD
= 1A
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 specified 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 LM2595 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
= 200 mA.
Symbol
Parameter
Conditions
LM2595-XX
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
1.2/1.3
V(max)
%
V
SAT
DC
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
I
OUT
= 1A
See
See
(5)
(6)
(4) (5)
1
100
0
(1)
(2)
(3)
(4)
(5)
(6)
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 specified 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. The amount of reduction is determined by the
severity of current overload.
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.
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