Datasheet

LTC4218
4
4218ff
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive, all voltages are referenced to
GND unless otherwise specifi ed.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
TIMER(RATIO)
TIMER Pin Current Ratio I
TIMER(DN)
/
I
TIMER(UP)
l
1.6 2 2.7 %
I
MON(FS)
I
MON
Full-Scale Output Current V
SENSE
+
– V
SENSE
–
= 15mV
l
94 100 106 μA
I
MON(OFF)
I
MON
Pin Offset Current V
SENSE
+
– V
SENSE
–
= 1mV
l
±0 ±6 μA
G
IMON
I
MON
Pin Gain V
SENSE
+
– V
SENSE
–
= 15mV and 1mV
l
6.47 6.67 6.87 μA/mV
AC Characteristics
t
PHL(GATE)
Input High (OV), Input Low (UV) to GATE
Low Propagation Delay
V
GATE
< 16.5V Falling
l
35 μs
t
PHL(SENSE)
V
SENSE
+
– V
SENSE
–
High to GATE Low
Propagation Delay
V
FB
= 0, Step (V
SENSE
+
– V
SENSE
–
) to
60mV, C
GATE
= 1.5nF, V
GATE
< 16.5V
Falling
l
0.2 1 μs
t
D(ON)
Turn-On Delay Step V
UV
to 2V, V
GATE
> 13V
l
50 100 150 ms
Note 3: An internal clamp limits the GATE pin to a maximum of 6.5V above
the SOURCE pin. Driving either GATE or SOURCE pin to voltages beyond
the clamp may damage the device.