Datasheet

LTC2952
4
2952fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V1 = V2 = VS = 2.7V TO 28V unless otherwise noted. (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Debounce Time Pins (ONT, OFFT)
I
ONT,OFFT
ONT/OFFT Pull-Up/Pull-Down Current
When Timer Is Active
V
ONT,
V
OFFT
= 0V (Pull-Up), V
ONT,
V
OFFT
= 1.5V
(Pull-Down)
l
±1.6 ±2.0 ±2.4 μA
t
DB,ON/OFF
Internal Default On-Time/Off-Time t
DB,ON
: C
ONT
= Open, Measured Time Between
PB
Low → EN High, t
DB,OFF
: Measured Time
Between PB
Low → INT Low
l
18 26 34 ms
t
ONT,OFFT
Additional Adjustable Turn-On/Turn-
Off Time (Note 7)
C
ONT
= 1500pF, C
OFFT
= 1500pF
l
10 15 20 ms
Accurate Comparator Input Pins (VM, PFI, M1, M2, KILL)
V
TH_VM
VM Input Reset Threshold Both Falling and Rising
l
0.492 0.500 0.508 V
V
TH
PFI, M1, M2, KILL Input Threshold
Voltage
Falling
l
0.492 0.500 0.508 V
V
HYS
PFI, M1, M2, KILL Input Hysteresis
l
51525 mV
I
IN_LKG
VM, PFI, M2, KILL Input Current V = 0.5V
l
±0.1 μA
I
M1_SRC
M1 Input Pull-Up Current M1 = 1V
l
–1.5 –3 –5 μA
V
M1(VOC)
M1 Voltage Open-Circuit
l
146 V
I
M1_LKG
M1 Input Leak Current M1 = 6V
l
±0.1 μA
Watchdog/Extend Pin (WDE)
V
WDE(H,TH)
Input High Threshold Voltage
l
1.5 V
V
WDE(L,TH)
Input Low Threshold Voltage
l
0.3 V
I
WDE(IN,HL)
High Low Input Current (Note 8)
l
±25 μA
I
WDE(IN,HZ)
Hi-Z Input Current V
WDE
= 0.7V, 1.1V
l
±10 μA
Open-Drain Output Pins (G1STAT, INT, RST, PFO)
I
OUT_LKG
Leakage Current V
PIN
= 5V
l
±1 μA
V
OL
Voltage Output Low I
PIN
= 1mA
l
0.4 V
High Voltage Open-Drain Output Pin (EN)
I
EN(LKG)
EN Leakage Current V
EN
= 28V, EN Sink Current Off
l
±1 μA
V
EN(VOL)
EN Voltage Output Low I
EN
= 3mA
l
0.4 V
V1 = 1.2V and/or V2 = 1.2V, I
EN
= 100μA
l
0.05 0.3 V
Voltage Monitor/Watchdog Timing
t
RST
Reset Timeout Period
l
140 200 260 ms
t
WDE
Watchdog Timeout Period
l
1.1 1.6 2.1 s
t
WDE(PW MIN)
Minimum Period Between
Consecutive Edges
l
510 μs
t
VM(UV)
VM Undervoltage Detect to RST VM Less Than V
TH_VM
by More Than 1% 150 μs
t
PFI
PFI Delay to PFO PFI More or Less Than V
PFI_TH
by More
Than 1%
150 μs