LTC1645 Linear Technology, LTC1645 Datasheet - Page 3

• Manufacturer Part Number: LTC1645
• Description: Dual-Channel Hot Swap Controller/Power Sequencer
• Manufacturer: Linear Technology

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.
SYMBOL PARAMETER
V
I
V
V
t
I
V
V
V
V
I
V
TYPICAL PERFOR A CE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
The
2.375V V
TM
CP
ON
CBD n
TM
CB1
CB2
ONFPD
ON1
ON2
ONHYST
OL
V
V
TM
GATE n
3.0
2.5
2.0
1.5
1.0
0.5
0
2
V
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
T
CC1
A
= 25 C
3
TIMER Pin Voltage Threshold
TIMER Pin Threshold Line Regulation
TIMER Pin Current
Circuit Breaker Trip Voltage 1
Circuit Breaker Trip Voltage 2
Circuit Breaker Trip Delay
GATE n Pin Output Current
External N-Channel Gate Drive
ON Pin Fast Pull-Down Threshold
ON Pin Threshold #1
ON Pin Threshold #2
ON Pin Hysteresis
ON Pin Input Current
Output Low Voltage
V
CC2
CC1
Supply Current vs Voltage
4
= 1.5V
5
12V, 1.2V V
6
V
CC1
V
CC2
7
(V)
= 12V
8
9
CC2
W
10
11
1645 G01
12V unless otherwise noted (Note 2).
U
12
CONDITIONS
V
Timer On, V
Timer Off, V
V
V
V
ON = 2.2V, V
ON = 0.7V, V
ON = 0.3V, V
Low to High
High to Low, Fast Pull-Down Engaged
Low to High, GATE1 Turns On
High to Low, GATE1 Turns Off
Low to High, GATE2 Turns On
High to Low, GATE2 Turns Off
V
RESET, FAULT, COMPOUT, I
CC1
CB1
CB2
CB n
CC1
V
GATE n
3.5
3.0
2.5
2.0
1.5
1.0
0.5
= 2.375V to 12V
= (V
= (V
= (V
= 5V, V
0
1
V
T
= (V
CC2
CC1
CC2
CC n
A
2
= 25 C
TIMER
TIMER
CC2
GATE n
GATE n
GATE n
GATE n
– V
– V
– V
Supply Current vs Voltage
3
V
= 3.3V
SENSE1
SENSE2
SENSE n
CC1
= 0.6V, V
4
= 1.5V
= V
= V
= V
– V
= 2.375V
5
CC n
CC n
CC n
CC n
)
)
) > 60mV
V
6
CC2
, V
, V
, V
)
CC1
Note 3: An internal zener on the GATE n pins clamps the charge pump
voltage to a typical maximum operating voltage of 22V. External overdrive
of a GATE pin (for example, from capacitive coupling of V
beyond the internal zener voltage may damage the device. If a lower
GATE n pin clamp voltage is desired, use an external zener diode.
CC1
CC1
CC1
(V)
OUT
7
V
CC1
= 5V
= 5V, V
= 5V, V
= 5V, V
8
= 1.6mA, V
= 12V
9 10 11 12
CC2
CC2
CC2
1645 G02
= 3.3V
= 3.3V
= 3.3V
CC1
= 5V
1.4
1.2
0.8
0.6
0.4
1.0
0.2
0
–40
Supply Current vs Temperature
– 12.5
V
V
1.212
0.375
0.775
1.975
– 2.3
0.35
MIN
CC1
CC2
4.5
0.8
46
46
2
30
–20
= 5V
= 3.3V
0
1.230
0.375
0.825
2.025
TEMPERATURE ( C)
0.16
TYP
– 10
1.5
0.4
0.8
– 2
0.01
12
50
50
25
1
2
40
12
20
I
I
CC2
CC1
40
LTC1645
1.248
0.425
0.825
2.050
2.025
MAX
– 1.7
– 7.5
0.85
0.4
0.4
CC n
56
56
16
50
9
2
A
60
= 25 C.
glitches)
80
1645 G03
UNITS
3
mV
mA
mV
mV
mA
mV
100
V
A
A
A
V
V
V
V
V
V
V
A
V
s