參數(shù)資料
型號(hào)： MAX5918LEEE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 電源管理
英文描述： Low-Voltage, Dual Hot-Swap Controllers with Independent ON/OFF Control
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： 0.150 INCH, QSOP-16
文件頁(yè)數(shù)： 8/15頁(yè)
文件大小： 443K
代理商： MAX5918LEEE
M
Startup Period
R
TIM
sets the duration of the startup period from 0.4ms
to 50ms (see the
Setting the Startup Period, RTIM
sec-
tion). The default startup period is fixed at 9ms when
TIM is floating. The startup period begins after the fol-
lowing three conditions are met:
1) V
IN1
or V
IN2
exceeds the UVLO threshold (2.4V) for
the UVLO to startup delay (37.5ms).
2) V
ON1
and V
ON2
exceed the ON threshold (0.875V).
3) The device is not latched or in its autoretry delay (see
the
Latched and Autoretry Overcurrent Fault
Management
section).
The MAX5918/MAX5919 limit the load current if an
overcurrent fault occurs during startup instead of com-
pletely turning off the external MOSFETs. The slow
comparator is disabled during the startup period and
the load current can be limited in two ways:
1) Slowly enhancing the MOSFETs by limiting the
MOSFET gate-charging current.
2) Limiting the voltage across the external current-
sense resistor.
During the startup period the gate-drive current is limit-
ed to 100μA and decreases with the increase of the
gate voltage (see the
Typical Operating Characteris-
tics
). This allows the controller to slowly enhance the
MOSFETs. If the fast comparator detects an overcur-
rent, the MAX5918/MAX5919 regulate the gate voltage
to ensure that the voltage across the sense resistor
does not exceed V
SU,TH
. This effectively regulates the
inrush current during startup. Figure 2 shows the start-
up waveforms. PGOOD_ goes high impedance 0.75ms
after the startup period if no fault condition is present.
VariableSpeed/BiLevel Fault Protection
VariableSpeed/BiLevel fault protection incorporates two
comparators with different thresholds and response
times to monitor the load current (Figure 3). During the
startup period, protection is provided by limiting the
load current. Protection is provided in normal operation
(after the startup period has expired) by discharging
both MOSFET gates with a strong 3mA pulldown cur-
rent in response to a fault condition. After a fault,
PGOOD_ is pulled low, the MAX5918L and MAX5919L
stay latched off and the MAX5918A and MAX5919A
automatically restart
Slow-Comparator Startup Period
The slow comparator is disabled during the startup
period while the external MOSFETs are turning on.
Disabling the slow comparator allows the device to
ignore the higher-than-normal inrush current charging
the board capacitors when a card is first plugged into a
live backplane.
Slow-Comparator Normal Operation
After the startup period is complete, the slow compara-
tor is enabled and the device enters normal operation.
The comparator threshold voltage (V
SC,TH
) is adjustable
from 25mV to 100mV. The slow-comparator response
Low-Voltage, Dual Hot-Swap Controllers with
Independent ON/OFF Control
8
_______________________________________________________________________________________
t
ON
4.3V TO 5.8V
V
GATE
V
GATE
V
OUT
PGOOD
ON
V
TH
V
OUT
I
LOAD
t
START
+ t
PGDLY
C
BOARD
= LARGE
C
BOARD
= 0
V
SU,TH
R
SENSE
Figure 2. Startup Waveform
SENSE VOLTAGE (V
IN
- V
SENSE
)
T
V
SC,TH
V
FC,TH
(4 x V
SC,TH
)
3ms
110
μ
s
260ns
SLOW
COMPARATOR
FAST
COMPARATOR
Figure 3. VariableSpeed/BiLevel Response
相關(guān)PDF資料
PDF描述
MAX5918 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125
MAX5918AEEE Low-Voltage, Dual Hot-Swap Controllers with Independent ON/OFF Control
MAX5920 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125
MAX5920AESA Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5918LEEE+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX5919AEEE 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, DUAL HOT-SWAP CONTROLLERS WITH I - Rail/Tube
MAX5919AEEE-T 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, DUAL HOT-SWAP CONTROLLERS WITH I - Tape and Reel
MAX5919LEEE 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, DUAL HOT-SWAP CONTROLLERS WITH I - Rail/Tube
MAX5919LEEE+ 制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 16QSOP - Rail/Tube
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