LM2597, LM2597HV
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SNVS119C –MARCH 1998–REVISED APRIL 2013
All Output Voltage Versions
Electrical Characteristics
(continued)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the
12V version. ILOAD = 100 mA.
Symbol
Parameter
Conditions
LM2597/LM2597HV-XX
Units
(Limits)
(1)
(2)
Typ
Limit
FLAG/DELAY CONTROL Test Circuit of Figure 31
Regulator Dropout
Detector
Threshold Voltage
Low (Flag ON)
96
%
%(min)
%(max)
V
92
98
VFSAT
IFL
Flag Output Saturation
Voltage
ISINK = 3 mA
VDELAY = 0.5V
VFLAG = 40V
0.3
0.3
0.7/1.0
V(max)
μA
Flag Output Leakage
Current
Delay Pin Threshold
Voltage
1.25
V
Low (Flag ON)
1.21
1.29
V(min)
V(max)
μA
High (Flag OFF) and VOUT Regulated
VDELAY = 0.5V
Delay Pin Source
Current
3
6
μA(max)
mV
Delay Pin Saturation
Low (Flag ON)
55
350/400
mV(max)
BIAS SUPPLY
IBS Bias Supply Pin Current
(9)
VBS = 2V
120
4
μA
μA(max)
mA
400
(9)
VBS = 4.4V
10
2
mA(max)
mA
(9)
IQ
Operating Quiescent Current VBS = 4.4V , Vin pin current
1
(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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