Datasheet

PWM_IN
LG
HG
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
LM2725, LM2726
SNVS144D –NOVEMBER 2000–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
LM2726 (continued)
VCC = CBOOT = 5V, SW = GND = 0V, unless otherwise specified. Typicals and limits appearing in plain type apply for T
A
=
T
J
= +25°C. Limits appearing in boldface type apply over the entire operating temperature range.
Symbol Parameter Condition Min Typ Max Units
t
on_min
Minimum Positive Input Pulse
Width 55
(1)
ns
t
off_min
Minimum Negative Input Pulse
Width 55
(2)
V
IH_PWM
PWM_IN High Level Input When PWM_IN pin goes high
2.4
Voltage from 0V
V
V
IL_PWM
PWM_IN Low Level Input When PWM_IN pin goes low
0.25
Voltage from 5V
(1) If after a rising edge, a falling edge occurs sooner than the specified value, the IC may intermittently fail to turn on the bottom gate when
the top gate is off. As the falling edge occurs sooner and sooner, the driver may start to ignore the pulse and produce no output.
(2) If after a falling edge, a rising edge occurs sooner than the specified value, the IC may intermittently fail to turn on the top gate when the
bottom gate is off. As the rising edge occurs sooner and sooner, the driver may start to ignore the pulse and produce no output.
TEST CIRCUIT DIAGRAMS
Figure 2. Timing Diagram
Figure 3. Enable Pin Shutdown
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