LTC1643ALC(RevA) Просмотр технического описания (PDF) - Linear Technology
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LTC1643ALC Datasheet PDF : 16 Pages
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LTC1643AL
LTC1643AL-1/LTC1643AH
DC ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
V12VIN = 12V, VEEIN = – 12V, V3VIN = 3.3V, V5VIN = 5V (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VTH
Power-Good Threshold Voltage V3VOUT
0°C ≤ TA ≤ 70°C q 2.8
2.9
3.0
V
– 40°C ≤ TA ≤ 85°C q 2.75
2.9
3.0
V
V5VOUT
0°C ≤ TA ≤ 70°C q 4.5
4.65
4.75
V
– 40°C ≤ TA ≤ 85°C q 4.4
4.65
4.75
V
VIL
Input Low Voltage
ON/ON, FAULT
q
0.8
V
VIH
Input High Voltage
ON/ON, FAULT
q2
V
VOL
Output Low Voltage
FAULT, PWRGD, I = 3mA
q
0.4
V
IIN
ON/ON Pin Input Current
ON/ON = GND
ON/ON= 12VIN
q
± 0.08 ±10
µA
q
± 0.08 ±10
µA
5VSENSE Input Current
5VSENSE = 5V
q
50
100
µA
3VSENSE Input Current
3VSENSE = 3V
q
50
100
µA
5VIN Input Current
5VIN = 5V
q
460 700
µA
3VIN Input Current
3VIN = 3V
q
320 600
µA
5VOUT Input Current
5VOUT = 5V, ON = 3V, ON = GND
q
240 500
µA
3VOUT Input Current
3VOUT = 3.3V, ON = 3V, ON = GND
q
220 500
µA
RDIS
5VOUT Discharge Impedance ON = GND or ON = 3V
3VOUT Discharge Impedance ON = GND or ON = 3V
12VOUT Discharge Impedance ON = GND or ON = 3V
VEEOUT Discharge Impedance ON = GND or ON = 3V
100
Ω
70
Ω
450
Ω
1600
Ω
ITIMER
TIMER Pin Current
Timer On, VTIMER = GND
Timer Off, VTIMER = 5V
q – 15 – 22 – 27
µA
45
mA
VTIMER
TIMER Threshold Voltage
(V12VIN – VTIMER)
q 0.5
0.9
1.3
V
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 PERFORMANCE CHARACTERISTICS
3.3V and 5V Current
Foldback Profile
11
10
9
3VOUT
8
7
5VOUT
6
5
4
3
2
1
RSENSE = 0.005Ω
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
1643A G01
12V Current Foldback Profile
1.0
0.5
0
0
2
4
6
8 10 12
OUTPUT VOLTAGE (V)
1643A G02
– 12V Current Foldback Profile
1.0
0.5
0
0 –2 –4 –6 –8 –10 –12
OUTPUT VOLTAGE (V)
1643A G03
1643afa
3
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