LTC1643L/LTC1643L-1/LTC1643H
DC ELECTRICAL CHARACTERISTICS
V12VIN = 12V, VEE = –12V, V3VIN = 3.3V, V5VIN = 5V.(Note 2)
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25°C.
A
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Power-Good Threshold Voltage
V
C Grade
I Grade
●
●
2.8
2.75
2.9
2.9
3.0
3.0
V
V
TH
3VOUT
V
C Grade
I Grade
●
●
4.5
4.4
4.65
4.65
4.75
4.75
V
V
5VOUT
V
Input Low Voltage
ON/ON, FAULT
●
●
●
0.8
V
V
V
IL
V
V
Input High Voltage
Output Low Voltage
ON/ON Pin Input Current
ON/ON, FAULT
2
IH
FAULT, PWRGD, I = 3mA
ON/ON = GND
0.4
OL
IN
I
●
●
± 0.08
± 0.08
±10
±10
µA
µA
ON/ON= 12V
IN
5V
3V
Input Current
Input Current
5V
3V
= 5V
●
●
●
●
●
●
50
50
100
100
700
600
500
500
µA
µA
µA
µA
µA
µA
SENSE
SENSE
SENSE
= 3V
SENSE
5V Input Current
IN
5V = 5V
IN
460
320
240
220
3V Input Current
IN
3V = 3V
IN
5V
OUT
3V
OUT
Input Current
Input Current
5V
OUT
3V
OUT
= 5V, ON = 3V, ON = GND
= 3.3V, ON = 3V, ON = GND
R
DIS
5V
3V
12V
Discharge Impedance
Discharge Impedance
ON = GND or ON = 3V
ON = GND or ON = 3V
ON = GND or ON = 3V
ON = GND or ON = 3V
100
70
450
1600
Ω
Ω
Ω
Ω
OUT
OUT
Discharge Impedance
Discharge Impedance
OUT
V
EEOUT
I
TIMER Pin Current
Timer On, V
Timer Off, V
= GND
= 5V
●
●
–15
0.5
–22
45
–27
1.3
µA
mA
TIMER
TIMER
TIMER
V
TIMER Threshold Voltage
(V
12VIN
– V )
TIMER
0.9
V
TIMER
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 PERFORMANCE CHARACTERISTICS
3.3V and 5V Current
Foldback Profile
12V Current Foldback Profile
–12V Current Foldback Profile
11
10
9
1.0
0.5
0
1.0
0.5
0
3V
OUT
8
7
5V
OUT
6
5
4
3
2
1
R
3
= 0.005Ω
SENSE
0
0
2
4
6
8
10
12
0
1
2
4
5
0
–2
–4
–6
–8
–10
–12
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1643 G02
1643 G01
1643 G03
3
Linear [ Linear ]
