LTC1646
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
= 5V and V = 3.3V unless otherwise noted.
temperature range, otherwise specifications are at T = 25°C. V
A
5VIN
3VIN
SYMBOL PARAMETER
CONDITIONS
OFF/ON, RESETIN, FAULT
, FAULT = 0V
MIN
2
TYP
MAX
UNITS
V
V
Input High Voltage
●
●
V
V
IH
TIMER Threshold Voltage
OFF/ON Input Current
V
1.15
1.25
1.35
TIMER
TIMER
I
OFF/ON = 5V
OFF/ON = 0V
●
●
±0.08
±0.08
±10
±10
µA
µA
IN
RESETIN Input Current
RESETIN = 5V
RESETIN = 0V
●
●
±0.08
±0.08
±10
±10
µA
µA
5V
3V
Input Current
Input Current
5V
3V
= 5V, 5V = 0V
OUT
●
●
●
●
●
●
66
66
100
100
1000
1.5
µA
µA
SENSE
SENSE
SENSE
SENSE
= 3.3V, 3V
= 0V
OUT
3V Input Current
3V = 3.3V
460
0.9
0.9
µA
IN
IN
5V
3V
Input Current
Input Current
5V
3V
= 5V, OFF/ON = 0V
mA
mA
OUT
OUT
OUT
OUT
= 3.3V, OFF/ON = 0V
1.5
I
TIMER Pin Current
OFF/ON = 0V, V
OFF/ON = 5V, V
= 0V
= 5V
–7
–5
6.6
–3
µA
mA
TIMER
TIMER
TIMER
R
DIS
5V
3V
Discharge Impedance
Discharge Impedance
OFF/ON = 5V
OFF/ON = 5V
●
●
120
120
220
220
Ω
Ω
OUT
OUT
V
V
Output Low Voltage
FAULT, PWRGD, RESETOUT, I = 2mA
, V = 5V and 3.3V
●
●
0.25
1.00
0.4
V
V
OL
PRECHARGE Reference Voltage
V
0.90
1.10
PXG
PRECHARGE 5VIN
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
5V Supply Current vs
IN
5V Current Foldback Profile
3.3V Current Foldback Profile
Temperature
12
11
10
9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
12
11
10
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
R
= 0.005Ω
1
R
= 0.007Ω
1
SENSE
SENSE
0
0
0
1
2
3
4
5
–50
–25
0
25
50
75
100
0
1
2
3
4
5
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1646 G02
1646 G03
1646 G01
1646fa
3
Linear [ Linear ]
