ltc4261cgn-trpbf Linear Technology Corporation, ltc4261cgn-trpbf Datasheet - Page 13

• Manufacturer Part Number: ltc4261cgn-trpbf
• Description: Negative Voltage Hot Swap Controllers With Adc And I2c Monitoring
• Manufacturer: Linear Technology Corporation

the voltage at V
GATE driver. The data converter and logic control circuits
are powered by an internal linear regulator that derives
5V from the 11.2V supply. The 5V output is available at
the INTV
load current).
Bypass capacitors of 1µF and 0.1µF are recommended
at V
to accommodate the maximum supply current require-
ment of the LTC4261/LTC4261-2 (5mA) plus the supply
current required by any external devices driven by the
V
voltage.
The maximum power dissipation in the resistor is:
If the power dissipation is too high for a single resistor,
use multiple low power resistors in series.
APPLICATIONS INFORMATION
IN
V
EE
A
B
R
P
and INTV
MAX
C
1µF
IN
IN
IN
V
and INTV
≤
EE
CC
=
I
V
C
0.1µF
IN MAX
VCC
48 (
(
INTV
(
pin for driving external circuits (up to 20mA
V
V MIN
CC
48
7
CC
IN
V MAX
LTC4261CGN
pins at the minimum intended operation
)
CC
(
to 11.2V (V
+
)
V
, respectively. R
IN
I
–
21
EXTERNAL
R
8 × 240Ω IN SERIES
1/4W EACH
IN
R
V
)
IN
Z MAX
–
Figure 2b. 200W AdvancedTCA Hot Swap Controller with Input/Output Monitoring
and Power Good Watchdog Using LTC4261 in I
(
ADIN
V
23
Z MIN
(
Z
ALERT
)
FLTIN
SDAO
PGIO
) and provides power to the
SDAI
SCL
PGI
PG
)
–48V RTN OUTPUT
)
22
1
6
5
28
27
4
3
2
IN
7.5k
R6
100k
R8
should be chosen
HCPL-0300
R7B
R7A
10k
10k
ANODE
CATHODE
Q3
OUTPUT
GND
V
SENSE
CC
R7
100k
5.1k
V
R9
OUT
R
L
2N5401
Q11
V
EE
R17
100k
1%
R19
2.49k
1%
ANODE
CATHODE
6N139
V
Q4
OUT
GND
V
Q12
2N5401
CC
R18
100k
1%
R20
2.49k
1%
MOC207
V
Initial Start-Up and Inrush Control
Several conditions must be satisfi ed before the FET turn-on
sequence is started. First the voltage at V
its 9V undervoltage lockout level. Next the internal supply
INTV
This generates a 100µs to 160µs power-on-reset pulse
during which the FAULT register bits are cleared and the
CONTROL register bits are set or cleared as described in
the register section. After the power-on-reset pulse, the
voltages at the UVH, UVL and OV pins must satisfy UVH
> 2.56V, UVL > 2.291V and OV < 1.77V to indicate that
the input power is within the acceptable range and the EN
pin must be pulled low. All the above conditions must be
satisfi ed throughout the duration of the start-up debounce
delay that is set by an external capacitor (C
to the TMR pin. C
10µA until the voltage at TMR reaches 2.56V. C
quickly discharged with a 12mA current. The initial delay
expires when TMR is brought below 75mV. The duration
of the start-up delay is given by:
O
R4
20k
Q5
V
V
FLTR100V10
t
2
IN
OUT
D
LUCENT
C Mode (Part Two)
–
V
CC
IN
= 256
V
V
CASE
+
OUT
OUT
must cross its 4.25V undervoltage lockout level.
+
–
PS9113
ms
V
O
ON/OFF
V
V
Q6
JW050A1-E
IN
IN
CATHODE
GND
V
V
LUCENT
+
–
CC
ANODE
CASE
EE
•
LTC4261/LTC4261-2
C
V
V
TMR
R22
OUT
OUT
1
1k
TMR
V
µF
+
–
OUT
is charged with a pull-up current of
5V
V
O
Q7
V
CATHODE
MOC207
EE
GND
V
CC
ANODE
PS9113
Q8
R23
5V
1k
MONITOR
R21
1k
SUPPLY
R24
5.1k
SCL
SDA
CONTROLLER
ALERT
MICRO-
V
LTC2900
DD
V
GND
GND
DD
7 × 2.4k, 0805
EACH 28.7W
RST
RST
TMR
IN
343Ω
must exceed
R
L
+
) connected
TMR
C
4000µF
100V
0V TRANSIENT
RESEVOIR
CAPACITOR
L
42612 F02b
13
is then
MBRM5100
42612fb