Datasheet

LM2742
www.ti.com SNVS266C –MARCH 2004–REVISED MARCH 2013
ELECTRICAL CHARACTERISTICS (continued)
V
CC
= 5V unless otherwise indicated. Typicals and limits appearing in plain type apply for T
A
=T
J
=+25°C. Limits appearing in
boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are specified by design,
test, or statistical analysis.
Symbol Parameter Conditions Min Typ Max Units
OSCILLATOR
R
FADJ
= 590kΩ 50
R
FADJ
= 88.7kΩ 300
R
FADJ
= 42.2kΩ, 0°C to +125°C 500 600 700
f
OSC
PWM Frequency kHz
R
FADJ
= 42.2kΩ, -40°C to +125°C 490 600 700
R
FADJ
= 17.4kΩ 1400
R
FADJ
= 11.3kΩ 2000
f
PWM
= 300kHz 90
D Max Duty Cycle %
f
PWM
= 600kHz 88
t
on-min
Minimum on-time 40 ns
LOGIC INPUTS AND OUTPUTS
V
SD-IH
SD Pin Logic High Trip Point 2.6 3.5 V
V
SD-IL
SD Pin Logic Low Trip Point 0°C to +125°C 1.3 1.6
V
-40°C to +125°C 1.25 1.6
V
PWGD-TH-LO
PWGD Pin Trip Points FB Voltage Going Down
0°C to +125°C 0.413 0.430 0.446 V
-40°C to +125°C 0.410 0.430 0.446
V
PWGD-TH-HI
PWGD Pin Trip Points FB Voltage Going Up
0°C to +125°C 0.691 0.710 0.734 V
-40°C to +125°C 0.688 0.710 0.734
V
PWGD-HYS
PWGD Hysteresis FB Voltage Going Down FB Voltage Going 35
mV
Up 110
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