Datasheet

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