LM1577, LM2577
SNOS658D –JUNE 1999–REVISED APRIL 2013
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Electrical Characteristics—LM1577-15, LM2577-15 (continued)
Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V, and ISWITCH = 0.
Symbol
Parameter
Conditions
Typical
LM1577-15
Limit(1)(2)
LM2577-15
Limit(3)
Units
(Limits)
Error Amplifier
Output Swing
Upper Limit
VFEEDBACK = 12.0V
2.4
V
V(min)
V
2.2/2.0
2.2/2.0
Lower Limit
0.3
VFEEDBACK = 18.0V
0.4/0.55
0.40/0.55
V(max)
μA
Error Amp
Output Current
VFEEDBACK = 12.0V to 18.0V
VCOMP = 1.0V
±200
±130/±90
±130/±90
μA(min)
μA(max)
μA
±300/±400
±300/±400
ISS
Soft Start Current
VFEEDBACK = 12.0V
VCOMP = 0V
5.0
2.5/1.5
7.5/9.5
2.5/1.5
7.5/9.5
μA(min)
μA(max)
%
D
Maximum Duty
Cycle
VCOMP = 1.5V
95
ISWITCH = 100 mA
93/90
93/90
%(min)
A/V
Switch
Transconductance
12.5
IL
Switch Leakage
Current
VSWITCH = 65V
VFEEDBACK = 18.0V
(Switch Off)
10
0.5
4.3
μA
μA(max)
V
300/600
0.7/0.9
300/600
0.7/0.9
VSAT
Switch Saturation
Voltage
ISWITCH = 2.0A
VCOMP = 2.0V
(Max Duty Cycle)
V(max)
NPN Switch
Current Limit
VCOMP = 2.0V
A
3.7/3.0
5.3/6.0
3.7/3.0
5.3/6.0
A(min)
A(max)
6
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