LT8584
4
8584fb
For more information www.linear.com/LT8584
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: Do not apply a positive or negative voltage or current source to
RTMR, otherwise permanent damage may occur.
Note 3: ABSMAX rating refers to the maximum DC + AC leakage spike. Do
not exceed 40V
DC
on any of the SW pins.
Note 4: The LT8584E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT8584I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8584H is guaranteed over the full –40°C to
150°C operating junction temperature range.
Note 5: This is a measure of time duration from the onset of the switch
turning on to the time the short-circuit protection circuit is disabled. If the
current comparator trips during this duration, the switch error latch is set.
This indicates that the connection to the transformer primary is most likely
shorted.
Note 6: This is a
measure of time duration for the switch clamp to operate
continuously without setting the switch error latch. If the switch clamp
remains engaged longer than the switch clamp blanking time, the switch
error latch is set and switching is disabled.
Note 7:
The voltage proportional to temperature (V
TEMP
) is measured
on the OUT pin while in analog multiplexer MODE 3 or 4. V
TEMP
must be
subtracted from the V
CELL
voltage that is measured while in analog mux
MODE 1. Both measurements should be taken within 100ms of each other
to reduce errors in absolute temperature calculation.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
W
Decode Window Duration R
RTMR
= 10kΩ
R
RTMR
= 50kΩ
R
RTMR
= 100kΩ
R
RTMR
= 200kΩ
l
l
l
l
1.76
8
15.6
29.3
1.86
8.4
16.4
31.5
1.96
8.8
17.2
33.7
ms
ms
ms
ms
Decode Window Range
l
1.76 33.7 ms
t
RST
D
IN
Serial Communication Reset Time
l
10 µs
t
1
RTMR Start-Up Time R
RTMR
= 10kΩ
l
1.8 5 µs
t
2
D
IN
Hold-Off Time
l
50 µs
t
3
D
IN
High Time
l
50 µs
t
4
D
IN
Low Time
l
50 µs
t
5
Discharger Activation Time R
RTMR
= 10kΩ 900 ns
t
6
Discharger Deactivation Time 2.1 µs
SR D
IN
Slew Rate
l
9 V/ms
TiMing characTerisTics
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. MODE = 0V. Refer to Timing Diagram for parameter definition. (Note 4)
The
l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V, D
IN
= GND unless otherwise noted. (Note 4)
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Handshake Voltage Line Regulation From V
VIN
= 2.5V to V
VIN
= 4.2V 0.2 0.75 %/V
V
TEMP
Temperature Coefficient (TC) Note 7, °K = (V
CELL
– V
TEMP
)/TC 2 mV/°K
V
TEMP
V
TEMP
= V
IN
– V
OUT
, T
J
= 25°C 0.658 V
OUT Pin Clamp Voltage 10mA Sourced from Pin
l
1.53 1.6 V
OUT Pin Amplifier Load Regulation I
OUT
= 10µA to 1mA
l
0 0.2 0.4 %/mA
