LT1640ALCN8 Linear Technology, LT1640ALCN8 Datasheet - Page 8

IC CONTRLR HOTSWAP NEGVOLT 8-DIP

LT1640ALCN8

Manufacturer Part Number
LT1640ALCN8
Description
IC CONTRLR HOTSWAP NEGVOLT 8-DIP
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Datasheet

Specifications of LT1640ALCN8

Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
-10 V ~ -80 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Family Name
LT1640AL
Package Type
PDIP
Operating Supply Voltage (min)
-10V
Operating Supply Voltage (max)
-80V
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Product Depth (mm)
6.48mm
Product Height (mm)
3.3mm
Product Length (mm)
10.16mm
Mounting
Through Hole
Pin Count
8
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1640ALCN8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S I FOR ATIO
LT1640AL/LT1640AH
Capacitor C1 and resistor R3 prevent Q1 from momen-
tarily turning on when the power pins first make contact.
Without C1 and R3, capacitor C2 would pull the gate of Q1
up to a voltage roughly equal to V
the LT1640A could power up and actively pull the gate
low. By placing capacitor C1 in parallel with the gate
capacitance of Q1 and isolating them from C2 using
resistor R3, the problem is solved. The value of C1 should
be:
where V
V
8
INMAX
V
INMAX
is the maximum operating input voltage.
TH
V
TH
is the MOSFET’s minimum gate threshold and
V
TH
U
C
2
U
C
GD
EE
W
• C2/C
CONTACT
GS
BOUNCE
(Q1) before
Figure 6b. Inrush Control Waveforms
U
R3’s value is not critical and is given by (V
5mA.
The waveforms are shown in Figure 6b. When the power
pins make contact, they bounce several times. While the
contacts are bouncing, the LT1640A senses an
undervoltage condition and the GATE is immediately
pulled low when the power pins are disconnected.
Once the power pins stop bouncing, the GATE pin starts to
ramp up. When Q1 turns on, the GATE voltage is held
constant by the feedback network of R3 and C2. When the
DRAIN voltage has finished ramping, the GATE pin then
ramps to its final value.
1640A F07b
INMAX
+ V
GATE
)/

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