LTC1647-2_15 Datasheet, PDF (3/22 Pages) Linear Technology – Dual Hot Swap Controllers

LTC1647-1/
LTC1647-2/LTC1647-3
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_CC
V_CCX Supply Range
Operating Range
l 2.7
16.5
V
I_CC
V_CC Supply Current (Note 4)
ON1, ON2 = V_CC1 = V_CC2, I_CC = I_CC1 + I_CC2
l
1.0
6
mA
I_CCX
V_CCX Supply Current (Note 5, LTC1647-3) ONX = V_CCX, I_CCX Individually Measured,
l
V_CC1 = 5V, V_CC2 = 12V or V_CC1 = 12V, V_CC2 = 5V
0.5
5
mA
V_LKO V_CCX Undervoltage Lockout
Coming Out of UVLO (Rising V_CCX)
l 2.30 2.45 2.60
V
V_LKH V_CCX Undervoltage Lockout Hysteresis
210
mV
V_CB
Circuit Breaker Trip Voltage
I_CP
GATEX Output Current
V_CB = V_CCX – V_SENSEX
l 40
50
60
mV
ONX High, FAULTX High, V_GATE = GND (Sourcing) l
6
10
14
μA
ONX Low, FAULTX High, V_GATE = V_CC (Sinking)
50
μA
ONX High, FAULTX Low, V_GATE = 15V (Sinking)
50
mA
ΔV_GATE External MOSFET Gate Drive
(V_GATE – V_CC), V_CC1 = V_CC2 = 5V
(V_GATE – V_CC), V_CC1 = V_CC2 = 12V
l 10
13
17
V
l 10
15
19
V
V_ONHI ONX Threshold High
l 1.20 1.29 1.38
V
V_ONLO ONX Threshold Low
l 1.17 1.21 1.25
V
V_ONHYST ONX Hysteresis
70
mV
I_IN
ONX Input Current
V_OL
FAULTX Output Low Voltage
(LTC1647-2, LTC1647-3)
I_LEAK FAULTX Output Leakage Current
(LTC1647-3)
ON = GND or V_CC
I_O = 1mA, V_CC = 5V
I_O = 5mA, V_CC = 5V
No Fault, FAULTX = V_CC = 5V
l
±1
±10
μA
l
0.4
V
0.8
V
±1
±10
μA
t_FAULT
t_RESET
t_ON
t_OFF
Circuit Breaker Delay Time
Circuit Breaker Reset Time
Turn-On Time
Turn-Off Time
V_CCX – V_SENSEX = 0 to 100mV
ONX High to Low, to FAULTX High
ONX Low to High, to GATEX On
ONX High to Low, to GATEX Off
0.3
μs
l
50
100
μs
2
μs
1
μs
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.
Note 3: An internal Zener on the GATE pins clamp the charge pump
voltage to a typical maximum operating voltage of 28V. External overdrive
of the GATE pin beyond the internal Zener voltage may damage the device.
The GATE capacitance must be < 0.15μF at maximum V_CC. If a lower GATE
pin clamp voltage is desired, use an external Zener diode.
Note 4: The total supply current I_CC is measured with V_CC1 and V_CC2
connected internally (LTC1647-1, LTC1647-2) or externally (LTC1647-3).
Note 5: The individual supply current I_CCX is measured on the LTC1647-3.
The lower of the two supplies, V_CC1 and V_CC2, will have its channel’s
current. The higher supply will carry the additional supply current of the
charge pump and the bias generator beside its channel’s current.
1647fa
3