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參數(shù)資料
| 型號： | MAX5918 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125 |
| 中文描述： | 低電壓、雙路、熱插拔控制器，帶有獨立的開/關控制 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 443K |
| 代理商： | MAX5918 |
M
Applications Information
Component Selection
N-Channel MOSFET
Select the external MOSFETs according to the applica-
tion
’
s current levels. Table 2 lists some recommended
components. The MOSFET
’
s on-resistance (R
DS(ON)
)
should be chosen low enough to have a minimum volt-
age drop at full load to limit the MOSFET power dissi-
pation. High R
DS(ON)
causes output ripple if there is a
pulsating load. Determine the device power rating to
accommodate a short-circuit condition on the board at
startup and when the device is in automatic-retry mode
(see the
MOSFET Thermal Considerations
section).
Using the MAX5918L/MAX5919L in latched mode allows
the use of MOSFETs with lower power ratings. A MOSFET
typically withstands single-shot pulses with higher dissi-
pation than the specified package rating. Table 3 lists
some recommended manufacturers and components.
Sense Resistor
The slow-comparator threshold voltage is adjustable
from 25mV to 100mV. Select a sense resistor that causes
a drop equal to the slow-comparator threshold voltage at
a current level above the maximum normal operating
current. Typically, set the overload current at 1.2 to 1.5
times the full load current. The fast-comparator threshold
is four times the slow-comparator threshold in normal
operating mode. Choose the sense resistor power rating
to be greater than (I
OVERLOAD
)
2
x V
SC,TH
.
Slow-Comparator Threshold, R
LIM
The slow-comparator threshold voltage is adjustable
from 25mV to 100mV, allowing designers to fine-tune
the current-limit threshold for use with standard-value
sense resistors. Low slow-comparator thresholds allow
for increased efficiency by reducing the power dissi-
pated by the sense resistor. Furthermore, the low 25mV
slow-comparator threshold is beneficial when operating
with supply rails down to 1V because it allows a small
percentage of the overall output voltage to be used for
current sensing. The VariableSpeed/BiLevel fault pro-
tection feature offers inherent system immunity against
load transients and noise. This allows the slow-com-
parator threshold to be set close to the maximum nor-
mal operating level without experiencing nuisance
faults. To adjust the slow-comparator threshold calcu-
late R
LIM
as follows:
where V
TH
is the desired slow-comparator threshold
voltage.
Setting the Startup Period, R
TIM
The startup period (t
START
) is adjustable from 0.4ms to
50ms. The adjustable startup period feature allows sys-
R
V
mV
A
μ
LIM
TH
0 25
.
=
25
Low-Voltage, Dual Hot-Swap Controllers with
Independent ON/OFF Control
10
______________________________________________________________________________________
PART
OVERCURRENT
FAULT (V
OUT1
)
OVERCURRENT
FAULT (V
OUT2
)
OVER/UNDER-
VOLTAGE FAULT
(V
OUT1
)
OVER/UNDER-
VOLTAGE FAULT
(V
OUT2
)
PGOOD1/
PGOOD2
GATE1/
GATE2
Yes
X
X
X
Yes
X
X
X
X
X
X
X
X
X
LOW/LOW
LOW/LOW
LOW/LOW
LOW/LOW
LOW/LOW
LOW/LOW
LOW/HIGH
HIGH/LOW
OFF/OFF
OFF/OFF
OFF/OFF
OFF/OFF
OFF/OFF
OFF/OFF
ON/ON
ON/ON
Yes
X
X
X
Yes
X
X
Yes
X
X
X
Yes
No
MAX5918
UV/OV
Protection
Yes
X
X
No
Yes
MAX5919
UV/OV
Monitor
Table 1. Status Output Truth Table
PART NUMBER
IRF7413
IRF7401
IRL3502S
MMSF3300
MMSF5N02H
MTB60N05H
FDS6670A
NDS8426A
FDB8030L
MANUFACTURER
DESCRIPTION
11m
, 8 SO, 30V
22m
, 8 SO, 20V
6m
, D2PAK, 20V
20m
, 8 SO, 30V
30m
, 8 SO, 20V
14m
, D
2
PAK, 50V
10m
, 8 SO, 30V
13.5m
, 8 SO, 20V
4.5m
, D
2
PAK, 30V
International
Rectifier
Motorola
Fairchild
Table 2. Recommended N-Channel
MOSFETs
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相關代理商/技術(shù)參數(shù) |
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| MAX5918AEEE | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, DUAL HOT-SWAP CONTROLLERS WITH I - Rail/Tube |
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