LTC1647-3CGN#PBF Linear Technology, LTC1647-3CGN#PBF Datasheet - Page 8
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LTC1647-3CGN#PBF
Manufacturer Part Number
LTC1647-3CGN#PBF
Description
IC CTLR HOTSWAP DUAL 16-SSOP
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Specifications of LTC1647-3CGN#PBF
Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
2.7 V ~ 16.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.150", 3.90mm Width)
Linear Misc Type
Positive Low Voltage
Family Name
LTC1647-3
Package Type
SSOP N
Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (max)
16.5V
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Product Depth (mm)
3.99mm
Product Height (mm)
1.5mm
Mounting
Surface Mount
Pin Count
16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
PIN FUNCTIONS
LTC1647-1/
LTC1647-2/LTC1647-3
V
The supply range for normal operation is 2.7V to 16.5V.
The supply current, I
undervoltage lockout (UVLO) circuit disables GATE 1 until
the supply voltage at V
2.45V). GATE 1 is held at ground potential until UVLO
deactivates. If ON1 is high and V
threshold voltage, GATE 1 is pulled high by a 10μA current
source. If V
immediately to ground. The internal reference and the
common charge pump are powered from the higher of
the two V
V
V
V
and the LTC1647-2. V
together.
GND: Chip Ground.
ON1: Channel 1 ON Input. The threshold at the ON1 pin is
set at 1.29V with 70mV hysteresis. If UVLO and the circuit
breaker of channel 1 are inactive, a logic high at ON1 enables
the 10μA charge pump current source, pulling the GATE
1 pin above V
pin is pulled to ground by a 50μA current sink.
ON1 resets channel 1’s electronic circuit breaker by pulling
ON1 low for greater than one t
low-to-high transition at ON1 restarts a normal GATE 1
pull-up sequence.
ON2: Channel 2 ON Input. See ON1 for functional
description.
8
CC
CC1
CC2
CC1
: The Common Positive Supply Input for the LTC1647-1
(LTC1647-3): Channel 2 Positive Supply Input. See
for functional description.
(LTC1647-3): Channel 1 Positive Supply Input.
CC
CC1
inputs, V
CC1
falls below (V
. If the ON1 pin is pulled low, the GATE 1
CC1
CC1
CC1
CC1
and V
, is typically 1mA. Channel 1’s
or V
is greater than V
LKO
CC2
CC2
– V
.
RESET
are internally connected
CC1
LKH
is above the UVLO
), GATE 1 is pulled
period (50μs). A
LKO
(typically
FAULT1: Channel 1 Open-Drain Fault Status Output. FAULT1
pin pulls low after 0.3μs (t
measures greater than 50mV across the sense resistor
connected between V
low, GATE 1 also pulls low. FAULT1 remains low until ON1
is pulled low for at least one t
FAULT2: Channel 2 Open-Drain Fault Status Output. See
FAULT 1 for functional description.
SENSE1: Channel 1 Circuit Breaker Current Sense Input.
Load current is monitored by a sense resistor connected
between V
voltage across the sense resistor exceeds 50mV (V
disable the circuit breaker, connect SENSE 1 to V
order to obtain optimum performance, use Kelvin-sense
connections between the V
current sense resistor.
SENSE2: Channel 2 Circuit Breaker Current Sense Input.
See SENSE 1 for functional description.
GATE1: Channel 1 N-channel MOSFET Gate Drive Output.
An internal charge pump guarantees at least 10V of gate
drive from a 5V supply. Two Zener clamps are incorporated
at the GATE 1 pin; one Zener clamps GATE 1 approximately
15V above V
appoximately 28V above GND. The rise time at GATE 1 is
set by an external capacitor connected between GATE 1
and GND and an internal 10μA current source provided
by the charge pump. The fall time at GATE 1 is set by
the 50μA current sink if ON1 is pulled low. If the circuit
breaker is tripped or the supply voltage hits the UVLO
threshold, a 50mA current sink rapidly pulls GATE 1 low.
An external 23V Zener from GATE1 to GND is required for
supply voltages (V
GATE2: Channel 2 N-channel MOSFET Gate Drive Output.
See GATE 1 for functional description.
NC: No Connection.
CC1
CC
and SENSE 1. The circuit breaker trips if the
and the second Zener clamps GATE 1
CC1
CC1
) greater than 10V.
and SENSE 1. If FAULT1 pulls
FAULT
CC
RESET
and SENSE pins to the
) if the circuit breaker
period.
CC1
CB
). To
1647fa
. In