MAX5924 MAXIM [Maxim Integrated Products], MAX5924 Datasheet - Page 15

• Manufacturer Part Number: MAX5924
• Description: 1V to 13.2V, n-Channel Hot-Swap Controllers Require No Sense Resistor
• Manufacturer: MAXIM [Maxim Integrated Products]

The fast-comparator trip current is determined by the
selected R
dently. The fast-comparator trip current is given by:
When operating with R
breaker threshold using the worst possible operating
conditions, and add a 20% overcurrent margin to the
maximum circuit current. For example, with a maximum
expected current of 2A, using a 20% margin, the cur-
rent for calculation is (2A) x (1.2) = 2.4A. The resulting
minimum circuit-breaker threshold is then a product of
this current and R
0.144V. Using this method to choose a circuit-breaker
threshold allows the circuit to operate under worst-case
conditions without causing a circuit-breaker fault, but
the circuit-breaker function will still detect a short-circuit
or a gross overcurrent condition.
Figure 13. Circuit Breaker Using R
Table 2. Programming the Temperature
Coefficient (MAX5926)
I
TRIPFAST
V
S
1V to 13.2V, n-Channel Hot-Swap Controllers
MAX5925
MAX5926
SELECT
TC
CB
High
Low
R
TC
value and cannot be adjusted indepen-
CB
=
SENSE
I
______________________________________________________________________________________
CB
CB
R
CBF
I
CB
R
I
LOAD
SENSE
x R
(
SENSE
= 0.06Ω, or (0.06Ω) x (2.4A) =
CBF
R
SENSE
V
SENSE
DS ON T
V
CBF,TH
CB,TH
, calculate the circuit-
+
(
R
V
V
GATE
CB
) ( )
CB,OS
CB,OS
TC
)
ICB
±
R
SLOW
COMPARATOR
FAST
COMPARATOR
3300
SENSE
V
(ppm/°C)
OUT
0
CB OS
,
V
OUT
Mode
Require No Sense Resistor
To determine the proper circuit-breaker resistor value,
use the following equation, which refers to Figure 12:
where I
current.
The fast-comparator trip current is determined by the
selected R
dently. The fast-comparator trip current is given by:
Figure 14. Circuit-Breaker Trip Point and Current-Sense
Voltage vs. Temperature
Table
APPLICATION
CURRENT (A)
I
TRIPFAST
10
R
1
2
5
TRIPSLOW
CB
3. Suggested External MOSFETs
CB
50
45
40
35
30
25
20
=
-40
value and cannot be adjusted indepen-
(
I
=
V
R
TRIPSLOW
International Rectifier
IRF7401
Siliconix Si4378DY
Siliconix SUD40N02-06
Siliconix SUB85N02-03
S
DS(ON)
= V
I
CIRCUIT-BREAKER TRIP REGION
is the desired slow-comparator trip
-15
CB
CC
(25) = 6.5mΩ
V
(3300ppm/°C)
= 13.2V, R
CB
x R
(V
= I
TEMPERATURE (°C)
10
V
(4500ppm/°C)
(
SENSE
CB
SENSE
PART
(T) x R
x R
CBF
CB
≥ V
35
= R
= 672Ω, I
I
R
CB
SENSE
CB
CB
DS(ON)
SENSE
+
)
+ R
60
CB,OS
R
(T) x I
TRIPSLOW
CB
)
LOAD(MAX)
+
)
85
±
= 5A,
V
SO-8
SO-8
DPAK
D2PAK
DESCRIPTION
V
CB OS
CB OS
110
,
,
15