LTC4253/LTC4253A
4
425353aff
For more information www.linear.com/4253
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.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL PARAMETER CONDITIONS
LTC4253 LTC4253A
UNITSMIN TYP MAX MIN TYP MAX
V
OV
OV Pin Threshold OV Low to High
●
5.04 5.09 5.14 V
V
OVHST
OV Pin Hysteresis
●
230 300 350
82
102
122
mV
mV
I
SENSE
SENSE Pin Input Current UV = 0V = 4V, V
SENSE
= 50mV
(Sourcing)
●
15 30 15 30 µA
I
INP
UV, OV Pin Input Current UV = OV = 4V
●
±0.1 ±1 ±0.1 ±1 µA
V
TMRH
TIMER Pin Voltage High Threshold
●
3.5 4 4.5 3.5 4 4.5 V
V
TMRL
TIMER Pin Voltage Low Threshold
●
0.8 1 1.2 0.8 1 1.2 V
I
TMR
TIMER Pin Current Timer On (Initial Cycle/Latchoff,
Sourcing), V
TMR
= 2V
●
3 5 7 3 5 7 µA
Timer Off (Initial Cycle, Sinking),
V
TMR
= 2V
28 28 mA
Timer On (Circuit Breaker, Sourcing,
I
DRN
= 0µA), V
TMR
= 2V
●
120 200 280 120 200 280 µA
Timer On (Circuit Breaker, Sourcing,
I
DRN
= 50µA), V
TMR
= 2V
600 600 µA
Timer Off (Circuit Breaker, Sinking),
V
TMR
= 2V
●
3 5 7 3 5 7 µA
∆I
TMRACC
∆I
DRN
I
TMR
at I
DRN
= 50µA – I
TMR
at I
DRN
= 0µA
50µA
Timer On (Circuit Breaker with
I
DRN
= 50µA)
●
7 8 9 7 8 9 µA/µA
V
SQTMRH
SQTIMER Pin Voltage High Threshold
●
3.5 4 4.5 3.5 4 4.5 V
V
SQTMRL
SQTIMER Pin Voltage Low Threshold 0.33 0.33 V
I
SQTMR
SQTIMER Pin Current SQTIMER On (Power Good
Sequence, Sourcing), V
SQTMR
= 2V
●
3 5 7 3 5 7 µA
SQTIMER Off (Power Good
Sequence, Sinking), V
SQTMR
= 2V
28 28 mA
V
DRNL
DRAIN Pin Voltage Low Threshold For PWRGD1, PWRGD2, PWRGD3 Status
●
2 2.39 3 2 2.39 3 V
I
DRNL
DRAIN Leakage Current V
DRAIN
= 5V
V
DRAIN
= 4V
±0.1 ±1
±0.1
±1
µA
µA
V
DRNCL
DRAIN Pin Clamp Voltage I
DRN
= 50µA
●
6 7 8.5 5 6 7.5 V
V
PGL
PWRGD1, PWRGD2, PWRGD3
Output Low Voltage
I
PG
= 1.6mA
I
PG
= 5mA
●
●
0.25 0.4
1.2
0.25 0.4
1.2
V
V
I
PGH
PWRGD1, PWRGD2, PWRGD3
Output High Current
V
PG
= 0V (Sourcing)
●
30 50 70 30 50 70 µA
t
SQ
SQTIMER Default Ramp Period SQTIMER Pin Floating,
V
SQTMR
Ramps from 0.5V to 3.5V
250 250 µs
t
SS
SS Default Ramp Period SS Pin Floating, V
SS
Ramps from 0.2V to 2V
SS Pin Floating, V
SS
Ramps from 0.2V to 1.25V
250
140
µs
µs
t
PLLUG
UV Low to GATE Low
●
0.4 5 0.4 5 µs
t
PHLOG
OV High to GATE Low
●
0.4 5 0.4 5 µs
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to V
EE
unless otherwise
specified.
