LTC4210 LINER [Linear Technology], LTC4210 Datasheet - Page 16

• Manufacturer Part Number: LTC4210
• Description: Dual Supply Hot Swap Controller for Advanced Mezzanine Card
• Manufacturer: LINER [Linear Technology]

LTC4223-1/LTC4223-2
GATE Pin Voltage
The gate drive at 12V
level MOSFET. The guaranteed range of gate drive is 4.5V
to 7.9V, with a typical of 6.2V.
Active Current Loop Compensation
The compensation network consisting of resistor R
gate slew rate control capacitor C
active current limit circuit. The value of C
on the inrush current allowed. The suggested value for
R
between 10Ω and 100Ω for optimum performance.
High Side Current Sense
The 12V load current is monitored via the voltage across an
external sense resistor. The LTC4223 features a high side
current sense amplifi er that translates the sense voltage
from the positive rail to the negative rail using a resistor
ratio of 33 times. The output voltage at 12IMON pin can
16
APPLICATIONS INFORMATION
G
is 47Ω. The value of C
I
12V
AUXOUT
TIMER
FAULT
OUT
FAULT PULLS LOW DUE TO AUX
OVERCURRENT FAULT AFTER POWER UP
START OF COOL-OFF CYCLE
1
10μA
2
V
TMR
GATE
COOL-OFF CYCLE
2μA
G
is compatible with any logic
should be ≤330nF and R
DEBOUNCE CYCLE
START OF
G
stabilizes the internal
3
10μA
Figure 8. Auto-Retry after AUX Overcurrent Fault
G
is selected based
RESET FAULT HIGH
4
V
DEBOUNCE CYCLE
TMR
2μA
G
and
G
is
END OF DEBOUNCE CYCLE
5 6 7
START AUX INTERNAL GATE RAMP WHEN STARTUP CONDITIONS ARE MET
AUX OUTPUT IN CURRENT LIMIT
then be fed into an LTC1197L ADC as shown in Figure 10
for data conversion. The current sense information can be
used by the system controller to manage the power budget
allocated to the modules on the card. Full scale input to
the current sense amplifi er is 82.5mV, corresponding to
an output of about 2.7V. If the input exceeds 100mV, the
output clamps at 3.2V.
V
The internal circuitry of the LTC4223 is powered from the
V
is derived from the same supply as is AUXIN, include a
decoupling resistor as shown in Figure 11. This RC net-
work allows the V
by short circuits on the auxiliary output or on adjacent
boards, thus preventing an undervoltage lockout condi-
tion on V
is 7V as compared to 10V for AUXIN, select R2 and C2 to
keep the peak voltage seen by V
voltage spikes.
10μA
CC
CC
FAULT PULLS LOW AND RESTART OF
COOL-OFF CYCLE DURING POWER UP
pin. Bypass V
8
Supply Filtering
V
FILTER DELAY
AUX INTERNAL GATE REGULATES
TMR
CC
2μA
. Since the absolute maximum rating for V
CC
COOL-OFF CYCLE
CC
pin to ride out supply glitches caused
with at least 330nF to ground. If V
10μA
9
V
TMR
CC
2μA
below 7V during any
DEBOUNCE CYCLE
RESTART OF
10
10μA
422312 F08
422312f
CC
CC