參數(shù)資料
型號(hào)： MAX5909EEE+
廠商： Maxim Integrated
文件頁(yè)數(shù)： 18/24頁(yè)
文件大?。?/td> 633K
描述： IC HOT-SWAP CTRLR DUAL 16QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 100
類型： 熱交換控制器
應(yīng)用： 通用型，PCI Express?
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： 1 V ~ 13.2 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 管件
Q
GATE
is the MOSFET total gate charge
I
GATE
is the gate charging/discharging current
In this case, the inrush current depends on the MOSFET
gate-to-drain capacitance (C
rss
) plus any additional
capacitance from gate to GND (C
GATE
), and on any
load current (I
LOAD
) present during the startup period.
Example: Charging and discharging times using the
Fairchild FDB7030L MOSFET
If V
IN1
= 5V then GATE1 charges up to 10.4V (V
IN1
+
V
DRIVE
), therefore V
GATE
= 10.4V. The manufacturers
data sheet specifies that the FDB7030L has approxi-
mately 60nC of gate charge and C
rss
= 600pF. The
MAX5904MAX5909 have a 100礎(chǔ) gate-charging cur-
rent and a 100礎(chǔ) weak discharging current or 3mA
strong discharging current.
C
BOARD
= 6礔 and the load does not draw any current
during the startup period.
With no gate capacitor the inrush current, charge, and
discharge times are:
With a 22nF gate capacitor the inrush current, charge,
and discharge times are:
Case B: Fast Turn-On (With Current Limit)
In applications where the board capacitance (C
BOARD
)
is high, the inrush current causes a voltage drop across
R
SENSE
that exceeds the startup fast-comparator
threshold. The fast comparator regulates the voltage
across the sense resistor to V
SU,TH
. This effectively
regulates the inrush current during startup. In this case,
the current charging C
BOARD
can be considered con-
stant and the turn-on time is:
The maximum inrush current in this case is:
Figures 28 show the waveforms and timing diagrams
for a startup transient with current regulation. (See the
Typical Operating Characteristics.) When operating
under this condition, an external gate capacitor is not
required.
ON Comparator
The ON comparator controls the on/off function of the
MAX5904MAX5909. ON is the input to a precision
three-level voltage comparator that allows individual
control over channel 1 and channel 2. Drive ON high
(> 2.025V) to enable channel 1 and channel 2. Pull ON
low (<0.4V) to disable both channels. To enable chan-
nel 1 only, V
ON
must be between the channel 1 ON
threshold (0.825V) and the channel 2 ON threshold
(2.025V). The device can be turned off slowly, reducing
inductive kickback, by forcing ON between 0.4V and
0.825V until the gates are discharged. The ON com-
parator is ideal for power sequencing (Figure 11).
Note that a minimum RC time delay of 20祍 is applied
to the steeply rising voltage at IN_ before the input volt-
age reaches the ON_ terminal. This allows internal cir-
cuits to stabilize prior to the signal arriving at the ON_
terminal.
Uncommitted Comparator
The MAX5906MAX5909 feature an uncommitted com-
parator that increases system flexibility. This compara-
tor can be used for voltage monitoring, or for
generating a power-on reset signal for on-card micro-
processors (Figure 12).
The uncommitted comparator output (OUTC) is open
drain and is pulled low when the comparator input volt-
age (V
INC+
) is below its threshold voltage (1.236V).
I
V
R
INRUSH
SUTH
SENSE
=
,
t
C
V    R
V
ON
BOARD
IN
SENSE
SUTH
=
?nbsp   ?/DIV>
,
I
F
pF
nF
A
mA
t
nF
V
nC
A
ms
t
nF
V
nC
A
ms
t
nF
V
nC
mA
ms
INRUSH
CHARGE
DISCHARGE  SLOW
DISCHARGE  FAST
=
?/DIV>
+
?nbsp   ?nbsp +  =
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
=
6
600
22
100
0  26 5
22    10 4    60
100
2 89
22    10 4    60
100
2 89
22    10 4    60
3
0 096
.
.
.
.
.
.
.
_
_
I
F
pF
A
A
t
V
nC
A
ms
t
V
nC
A
ms
t
V
nC
mA
ms
INRUSH
CHARGE
DISCHARGE  SLOW
DISCHARGE  FAST
=
?/DIV>
+
?nbsp   ?nbsp +  =
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
=
6
600
0
100
0  1
0  10 4    60
100
0 6
0  10 4    60
100
0 6
0  10 4    60
3
0 02
.
.
.
.
.
.
_
_
I
C
C
C
I
I
INRUSH
BOARD
rss
GATE
GATE    LOAD
=
+
?/DIV>
+
Low-Voltage, Dual Hot-Swap Controllers/Power
Sequencers
18   ______________________________________________________________________________________
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5909EEE+ 功能描述:熱插拔功率分布 13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5909EEE+T 功能描述:熱插拔功率分布 13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5909EEE-T 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5909UEE 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5909UEE+ 功能描述:熱插拔功率分布 13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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