LTC1643ALC 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 ● 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 ● 2.8
2.9
3.0
V
– 40°C ≤ TA ≤ 85°C ● 2.75
2.9
3.0
V
V5VOUT
0°C ≤ TA ≤ 70°C ● 4.5
4.65
4.75
V
– 40°C ≤ TA ≤ 85°C ● 4.4
4.65
4.75
V
VIL
Input Low Voltage
ON/ON, FAULT
●
0.8
V
VIH
Input High Voltage
ON/ON, FAULT
●2
V
VOL
Output Low Voltage
FAULT, PWRGD, I = 3mA
●
0.4
V
IIN
ON/ON Pin Input Current
ON/ON = GND
ON/ON= 12VIN
●
± 0.08 ±10
µA
●
± 0.08 ±10
µA
5VSENSE Input Current
5VSENSE = 5V
●
50
100
µA
3VSENSE Input Current
3VSENSE = 3V
●
50
100
µA
5VIN Input Current
5VIN = 5V
●
460 700
µA
3VIN Input Current
3VIN = 3V
●
320 600
µA
5VOUT Input Current
5VOUT = 5V, ON = 3V, ON = GND
●
240 500
µA
3VOUT Input Current
3VOUT = 3.3V, ON = 3V, ON = GND
●
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
● – 15 – 22 – 27
µA
45
mA
VTIMER
TIMER Threshold Voltage
(V12VIN – VTIMER)
● 0.5
0.9
1.3
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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
1643afb
3
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