LT1641CS8#PBF Linear Technology, LT1641CS8#PBF Datasheet - Page 11

• Manufacturer Part Number: LT1641CS8#PBF
• Description: IC CTRLR HOTSWAP POS VOLT 8SOIC
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LT1641CS8#PBF

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 9 V ~ 80 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIO S I FOR ATIO
Layout Considerations
To achieve accurate current sensing, a Kelvin connection
is recommended. The minimum trace width for 1oz cop-
per foil is 0.02" per amp to make sure the trace stays at a
reasonable temperature. 0.03" per amp or wider is recom-
mended. Note that 1oz copper exhibits a sheet resistance
of about 530µΩ/ . Small resistances add up quickly in
Figure 15. Gate Drive vs Supply Voltage
Figure 13. Overvoltage Waveforms
18
16
14
12
10
8
6
4
2
0
8
U
13
U
V
CC
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
(V)
18
W
23
1641 F15
U
UV = 37V
48V
SHORT
V
GND
IN
10.2k
PIN
294k
1%
1%
R1
R2
high current applications. To make the system immune to
noise, the resistor divider to the ON pin needs to be close
to the chip and keep traces to V
capacitor from the ON pin to GND also helps reject induced
noise. Figure 16 shows a layout that addresses these
issues.
1
TIMER
ON
V
CC
Figure 16. Recommended Layout for R1, R2 and R
8
5
0.01Ω
R
C2
0.68µF
S
SENSE
Figure 14. Active Low Enable Module
7
LT1641
10Ω
5%
R5
IRF530
GATE
GND
Q1
1k, 5%
6
4
I
LOAD
R6,
R1
R2
PWRGD
10nF
C1
D1
CMPZ
5248B
FB
2
3
I
LOAD
MMBT5551LT1
R3
143k
1%
R4
4.22k
1%
LT1641
CC
R7
47k
5%
Q2
and GND short. A 0.1µF
+
SENSE
RESISTOR, R
1541 F16
C
220µF
L
S
LT1641
ENABLE MODULE
V
ON/OFF
V
IN
IN
ACTIVE LOW
+
–
11
V
V
S
OUT
OUT
+
–
1641 F14
1641fd
V
OUT