LTC1646
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
5VIN
= 5V and V
3VIN
= 3.3V unless otherwise noted.
SYMBOL
V
IH
V
TIMER
I
IN
PARAMETER
Input High Voltage
TIMER Threshold Voltage
OFF/ON Input Current
RESETIN Input Current
5V
SENSE
Input Current
3V
SENSE
Input Current
3V
IN
Input Current
5V
OUT
Input Current
3V
OUT
Input Current
I
TIMER
R
DIS
V
OL
V
PXG
TIMER Pin Current
5V
OUT
Discharge Impedance
3V
OUT
Discharge Impedance
Output Low Voltage
PRECHARGE Reference Voltage
CONDITIONS
OFF/ON, RESETIN, FAULT
V
TIMER
, FAULT = 0V
OFF/ON = 5V
OFF/ON = 0V
RESETIN = 5V
RESETIN = 0V
5V
SENSE
= 5V, 5V
OUT
= 0V
3V
SENSE
= 3.3V, 3V
OUT
= 0V
3V
IN
= 3.3V
5V
OUT
= 5V, OFF/ON = 0V
3V
OUT
= 3.3V, OFF/ON = 0V
OFF/ON = 0V, V
TIMER
= 0V
OFF/ON = 5V, V
TIMER
= 5V
OFF/ON = 5V
OFF/ON = 5V
FAULT, PWRGD, RESETOUT, I = 2mA
V
PRECHARGE
, V
5VIN
= 5V and 3.3V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
MIN
2
1.15
TYP
1.25
±0.08
±0.08
±0.08
±0.08
66
66
460
0.9
0.9
MAX
1.35
±10
±10
±10
±10
100
100
1000
1.5
1.5
–3
220
220
0.4
1.10
UNITS
V
V
µA
µA
µA
µA
µA
µA
µA
mA
mA
µA
mA
Ω
Ω
V
V
–7
–5
6.6
120
120
0.25
0.90
1.00
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.
TYPICAL PERFOR A CE CHARACTERISTICS
5V Current Foldback Profile
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
R
SENSE
= 0.007Ω
3
2
4
OUTPUT VOLTAGE (V)
5
1646 G01
8
7
6
5
4
3
2
1
0
0
1
R
SENSE
= 0.005Ω
3
2
OUTPUT VOLTAGE (V)
4
5
1646 G02
SUPPLY CURRENT (mA)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
U W
3.3V Current Foldback Profile
12
11
10
9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
5V
IN
Supply Current vs
Temperature
1.0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
1646 G03
1646fa
3
LINER [ LINEAR TECHNOLOGY ]
