Input Voltage (SENSE) ................. – 0.3V to (V
CC
+ 0.3V)
Input Voltage (ON) .....................................– 0.3V to 17V
Output Voltage (FAULT) ..............................– 0.3V to 17V
Output Voltage (GATE) ...........Internally Limited (Note 3)
PIN CONFIGURATION
TOP VIEW
V
CC1
TOP VIEW
V
CC
1
ON1 2
ON2 3
GND 4
8
7
6
5
SENSE1
SENSE2
GATE1
GATE2
V
CC
1
ON1/FAULT1 2
ON2/FAULT2 3
GND 4
TOP VIEW
8
7
6
5
SENSE1
SENSE2
GATE1
GATE2
ON1
FAULT1
ON2
FAULT2
NC
NC
GND
1
2
3
4
5
6
7
8
16 V
CC2
15 SENSE1
14 SENSE2
13 GATE1
12 GATE2
11 NC
10 NC
9
NC
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
q
JA
= 130°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
q
JA
= 130°C/W
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
q
JA
= 130°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1647-1CS8#PBF
LTC1647-1IS8#PBF
LTC1647-2CS8#PBF
LTC1647-2IS8#PBF
LTC1647-3CGN#PBF
LTC1647-3IGN#PBF
TAPE AND REEL
LTC1647-1CS8#TRPBF
LTC1647-1IS8#TRPBF
LTC1647-2CS8#TRPBF
LTC1647-2IS8#TRPBF
LTC1647-3CGN#TRPBF
LTC1647-3IGN#TRPBF
PART MARKING*
16471
16471I
16472
16472I
16473
16473I
PACKAGE DESCRIPTION
8-Lead (4mm
¥
3mm) Plastic SO
8-Lead (4mm
¥
3mm) Plastic SO
8-Lead (4mm
¥
3mm) Plastic SO
8-Lead (4mm
¥
3mm) Plastic SO
16-Lead Plastic SSOP
16-Lead Plastic SSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
1647fa
2
LTC1647-1/
LTC1647-2/LTC1647-3
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
CC
I
CC
I
CCX
V
LKO
V
LKH
V
CB
I
CP
V
CCX
Supply Range
V
CC
Supply Current (Note 4)
V
CCX
Supply Current (Note 5, LTC1647-3)
V
CCX
Undervoltage Lockout
V
CCX
Undervoltage Lockout Hysteresis
Circuit Breaker Trip Voltage
GATEX Output Current
V
CB
= V
CCX
– V
SENSEX
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)
(V
GATE
– V
CC
), V
CC1
= V
CC2
= 5V
(V
GATE
– V
CC
), V
CC1
= V
CC2
= 12V
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
CONDITIONS
Operating Range
ON1, ON2 = V
CC1
= V
CC2
, I
CC
= I
CC1
+ I
CC2
ONX = V
CCX
, I
CCX
Individually Measured,
V
CC1
= 5V, V
CC2
= 12V or V
CC1
= 12V, V
CC2
= 5V
Coming Out of UVLO (Rising V
CCX
)
l
l
l
l
MIN
2.7
TYP
1.0
0.5
MAX
16.5
6
5
2.60
60
14
UNITS
V
mA
mA
V
mV
mV
μA
μA
mA
V
V
V
V
mV
μA
V
V
μA
μs
2.30
40
6
2.45
210
50
10
50
50
13
15
1.29
1.21
70
±1
0.8
±1
0.3
ΔV
GATE
V
ONHI
V
ONLO
I
IN
V
OL
I
LEAK
t
FAULT
t
RESET
t
ON
t
OFF
External MOSFET Gate Drive
ONX Threshold High
ONX Threshold Low
ONX Input Current
FAULTX
Output Low Voltage
(LTC1647-2, LTC1647-3)
FAULTX
Output Leakage Current
(LTC1647-3)
Circuit Breaker Delay Time
Circuit Breaker Reset Time
Turn-On Time
Turn-Off Time
l
l
l
l
l
l
10
10
1.20
1.17
17
19
1.38
1.25
±10
0.4
±10
V
ONHYST
ONX Hysteresis
ON = GND or V
CC
I
O
= 1mA, V
CC
= 5V
I
O
= 5mA, V
CC
= 5V
No Fault,
FAULTX
= V
CC
= 5V
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
l
50
2
1
100
μs
μs
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
LTC1647-1/
LTC1647-2/LTC1647-3
PIN TABLES
LTC1647-1 Pinout
PIN
1
2
3
4
DESCRIPTION
V
CC
ON1
ON2
GND
PIN
5
6
7
8
DESCRIPTION
GATE2
GATE1
SENSE2
SENSE1
LTC1647-3 Pinout
PIN
1
2
3
4
5
6
7
PIN
5
6
7
8
DESCRIPTION
GATE2
GATE1
SENSE2
SENSE1
8
DESCRIPTION
V
CC
ON1
FAULT1
ON2
FAULT2
NC
NC
GND
PIN
9
10
11
12
13
14
15
16
DESCRIPTION
NC
NC
NC
GATE2
GATE1
SENSE2
SENSE1
V
CC2
LTC1647-1 Does Not Have the FAULT Status Feature.
LTC1647-2 Pinout
PIN
1
2
3
4
DESCRIPTION
V
CC
ON1 and
FAULT1
(Internally Tied Together)
ON1 and
FAULT2
(Internally Tied Together)
GND
The ONX/FAULTX must be connected to a driver via a resistor if the
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