Datasheet

LTC1646
3
1646fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
Input High Voltage OFF/ON, RESETIN, FAULT ● 2V
V
TIMER
TIMER Threshold Voltage V
TIMER
, FAULT = 0V ● 1.15 1.25 1.35 V
I
IN
OFF/ON Input Current OFF/ON = 5V ● ±0.08 ±10 µA
OFF/ON = 0V
● ±0.08 ±10 µA
RESETIN Input Current RESETIN = 5V ● ±0.08 ±10 µA
RESETIN = 0V
● ±0.08 ±10 µA
5V
SENSE
Input Current 5V
SENSE
= 5V, 5V
OUT
= 0V ● 66 100 µA
3V
SENSE
Input Current 3V
SENSE
= 3.3V, 3V
OUT
= 0V ● 66 100 µA
3V
IN
Input Current 3V
IN
= 3.3V ● 460 1000 µA
5V
OUT
Input Current 5V
OUT
= 5V, OFF/ON = 0V ● 0.9 1.5 mA
3V
OUT
Input Current 3V
OUT
= 3.3V, OFF/ON = 0V ● 0.9 1.5 mA
I
TIMER
TIMER Pin Current OFF/ON = 0V, V
TIMER
= 0V ● –7 –5 –3 µA
OFF/ON = 5V, V
TIMER
= 5V 6.6 mA
R
DIS
5V
OUT
Discharge Impedance OFF/ON = 5V ● 120 220 Ω
3V
OUT
Discharge Impedance OFF/ON = 5V ● 120 220 Ω
V
OL
Output Low Voltage FAULT, PWRGD, RESETOUT, I = 2mA ● 0.25 0.4 V
V
PXG
PRECHARGE Reference Voltage V
PRECHARGE
, V
5VIN
= 5V and 3.3V ● 0.90 1.00 1.10 V
ELECTRICAL CHARACTERISTICS
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.
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
UW
5V Current Foldback Profile 3.3V Current Foldback Profile
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (A)
2
4
5
1646 G01
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
SENSE
= 0.007Ω
1646 G02
12
11
10
9
8
7
6
5
4
3
2
1
0
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (A)
2
4
5
13
R
SENSE
= 0.005Ω
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1646 G03
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
5V
IN
Supply Current vs
Temperature