LTC1647-1/
LTC1647-2/LTC1647-3
3
1647fa
ELECTRICAL CHARACTERISTICS
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
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,
V
CC1
= 5V, V
CC2
= 12V or V
CC1
= 12V, V
CC2
= 5V
l
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 V
CB
= V
CCX
– V
SENSEX
l
40 50 60 mV
I
CP
GATEX Output Current ONX High, FAULTX High, V
GATE
= GND (Sourcing)
ONX Low, FAULTX High, V
GATE
= V
CC
(Sinking)
ONX High, FAULTX Low, V
GATE
= 15V (Sinking)
l
610
50
50
14 μA
μA
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
l
10
10
13
15
17
19
V
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 ON = GND or V
CC
l
±1 ±10 μA
V
OL
FAULTX Output Low Voltage
(LTC1647-2, LTC1647-3)
I
O
= 1mA, V
CC
= 5V
I
O
= 5mA, V
CC
= 5V
l
0.8
0.4 V
V
I
LEAK
FAULTX Output Leakage Current
(LTC1647-3)
No Fault, FAULTX = V
CC
= 5V ±1 ±10 μA
t
FAULT
Circuit Breaker Delay Time V
CCX
– V
SENSEX
= 0 to 100mV 0.3 μs
t
RESET
Circuit Breaker Reset Time ONX High to Low, to FAULTX High
l
50 100 μs
t
ON
Turn-On Time ONX Low to High, to GATEX On 2 μs
t
OFF
Turn-Off Time ONX High to Low, to GATEX Off 1 μs
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
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.
