LTC1647-1IS8#TRPBF Linear Technology, LTC1647-1IS8#TRPBF Datasheet - Page 10
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LTC1647-1IS8#TRPBF
Manufacturer Part Number
LTC1647-1IS8#TRPBF
Description
IC CONTROLLR HOTSWAP DUAL 8-SOIC
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Datasheet
1.LTC1647-1CS8PBF.pdf
(22 pages)
Specifications of LTC1647-1IS8#TRPBF
Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
2.7 V ~ 16.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Linear Misc Type
Positive Low Voltage
Family Name
LTC1647-1
Package Type
SOIC N
Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (max)
16.5V
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Product Depth (mm)
3.99mm
Product Height (mm)
1.5mm
Product Length (mm)
5mm
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LTC1647-1/
LTC1647-2/LTC1647-3
BLOCK DIAGRAMS
APPLICATIONS INFORMATION
V
The LTC1647-3 features separate supply inputs (V
and V
pump circuit draw supply current from the higher of the
two supplies. An internal V
makes the power connection automatically. This allows
a 3V channel to have standard MOSFET gate overdrive
when the other channel is 5V. An internal Zener clamps
GATE about 15V above V
If both supplies are connected together (internally for
LTC1647-1 and LTC1647-2 or externally for LTC1647-3),
the reference and charge pump circuit draw equal current
from both pins.
10
CC
Selection Circuit
CC2
) for each channel. The reference and charge
SENSE1
SENSE2
FAULT1
FAULT2
V
V
GND
ON1
ON2
CC1
CC2
15
16
14
1
2
3
8
4
5
CC
CC
+
–
.
1.21V
50mV
selection circuit detects and
REFERENCE
–
–
+
+
2.45V
UVL
1.21V
FILTER
50μs
(DUPLICATE OF CHANNEL ONE)
CHARGE
PUMP
CC1
CHANNEL TWO
LTC1647-3
CHANNEL ONE
FAULT
CP
Electronic Circuit Breaker
Each channel of the LTC1647 features an electronic circuit
breaker to protect against excessive load current and short-
circuits. Load current is monitored by sense resistor R1 as
shown in Figure 1. The circuit breaker threshold, V
50mV and it exhibits a response time, t
300ns. If the voltage between V
for more than t
pulls GATE low with a 50mA current sink. The MOSFET turns
off and FAULT pulls low. The circuit breaker is cleared by
pulling the ON pin low for a period of at least t
A timing diagram of these events is shown in Figure 2.
The value of the sense resistor R1 is given by:
R1 = V
SELECTION
V
CC
CB
/I
TRIP
FAULT
(Ω)
, the circuit breaker trips and immediately
CP
10μA
50μA
CC
and SENSE exceeds V
FAULT
1647-1/2/3 BD3
13
12
, of approximately
GATE1
GATE2
RESET
(50μs).
CB
1647fa
, is
CB