Datasheet

LM2597, LM2597HV
www.ti.com SNVS119C –MARCH 1998–REVISED APRIL 2013
All Output Voltage Versions
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. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the
12V version. I
LOAD
= 100 mA.
Symbol Parameter Conditions LM2597/LM2597HV-XX Units
(Limits)
Typ
(1)
Limit
(2)
FLAG/DELAY CONTROL Test Circuit of Figure 31
Regulator Dropout Low (Flag ON) 96 %
Detector
92 %(min)
Threshold Voltage
98 %(max)
VF
SAT
Flag Output Saturation I
SINK
= 3 mA 0.3 V
Voltage
V
DELAY
= 0.5V 0.7/1.0 V(max)
IF
L
Flag Output Leakage V
FLAG
= 40V 0.3 μA
Current
Delay Pin Threshold 1.25 V
Voltage
Low (Flag ON) 1.21 V(min)
High (Flag OFF) and V
OUT
Regulated 1.29 V(max)
Delay Pin Source V
DELAY
= 0.5V 3 μA
Current
6 μA(max)
Delay Pin Saturation Low (Flag ON) 55 mV
350/400 mV(max)
BIAS SUPPLY
I
BS
Bias Supply Pin Current V
BS
= 2V
(9)
120 μA
400 μA(max)
V
BS
= 4.4V
(9)
4 mA
10 mA(max)
I
Q
Operating Quiescent Current V
BS
= 4.4V , V
in
pin current
(9)
1 2 mA
(9) 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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