LM2597, LM2597HV
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SNVS119C –MARCH 1998–REVISED APRIL 2013
LM2597/LM2597HV-12
Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range.VINmax=40V for the LM2597 and 60V for the LM2597HV
Symbol
Parameter
Conditions
LM2597/LM2597HV-12
Units
(Limits)
(1)
(2)
Typ
Limit
SYSTEM PARAMETERS Test Circuit Figure 31(3)(4)
VOUT
Output Voltage
Efficiency
15V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A
12
V
11.52/11.40
12.48/12.60
V(min)
V(max)
%
η
VIN = 25V, ILOAD = 0.5A
88
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) 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).
(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
When the LM2597/LM2597HV is used as shown in the Figure 31 test circuit, system performance will be as shown in system
parameters section of Electrical Characteristics.
(4) No diode, inductor or capacitor connected to output pin.
LM2597/LM2597HV-ADJ
Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range.VINmax=40V for the LM2597 and 60V for the LM2597HV
Symbol
Parameter
Conditions
LM2597/LM2597HV-ADJ
Units
(Limits)
(1)
(2)
Typ
Limit
SYSTEM PARAMETERS Test Circuit Figure 31(3)(4)
VFB
Feedback Voltage
Efficiency
4.5V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A
1.230
80
V
VOUT programmed for 3V. Circuit of Figure 31.
1.193/1.180
1.267/1.280
V(min)
V(max)
%
η
VIN = 12V, VOUT = 3V, ILOAD = 0.5A
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) 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).
(3) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
When the LM2597/LM2597HV is used as shown in the Figure 31 test circuit, system performance will be as shown in system
parameters section of Electrical Characteristics.
(4) No diode, inductor or capacitor connected to output pin.
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