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參數(shù)資料
| 型號： | MAX4273EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PTICH, M0-137, QSOP-16 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 407K |
| 代理商： | MAX4273EEE |
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
______________________________________________________________________________________
17
CTON determines the maximum time allowed to com-
plete turn-on for the MAX4273. The default values for
turn-on time (t
ON
) and t
RETRY
are chosen by leaving
these pins floating; they are 10μs and 320μs, respec-
tively. These are also the minimum values (not con-
trolled and dependent on stray capacitance). Longer
timings are determined by the size of the capacitor
according to Figure 8, and can be determined in Table
5, which lists the startup and retry timing parameters.
Set the t
ON
timer long enough to allow for the MOSFET to
be enhanced and the load capacitor to be charged com-
pletely .
There are two ways of completing the startup sequence.
Case A
describes a startup sequence that does not use
the current-limiting feature and slowly turns on the MOS-
FET by limiting the gate dv/dt.
Case B
uses the current-
limiting feature and turns on the MOSFET as fast as
possible while still preventing a high inrush current.
Case A. Startup Without Current Regulation
There are three ways to turn on the MOSFET without
reaching the fast comparator current limit:
1) If the board capacitance is small, the inrush current
is low.
2) If the gate capacitance is high, the MOSFET turns on
slowly.
3) The fast comparator can be disabled (MAX4273
only).
In all three cases, t
ON
is determined only by the charge
required to enhance the MOSFET. Effectively, the small
gate-charging current limits the output voltage dv/dt.
This time can be extended by connecting an external
capacitor between GATE and GND (MAX4271/
MAX4272) (Figure 9) or between GATE and CEXT
(MAX4273). The turn-on time is dominated by the exter-
nal gate capacitance if this value is considerably higher
than the MOSFET gate capacitance. Table 6 shows the
timing required to enhance the recommended MOSFET
with or without the external capacitor; Figure 3 shows
the related waveforms and timing diagrams. (See Time
to Charge Gate vs. C
GATE
and Startup Time with
C
BOARD
= 0 in the
Typical Operating Characteristics
.)
Remember that a high gate capacitance also increases
the turn-off time (t
OFF
), except in the case of a
MAX4273 fast fault.
If an external gate capacitor is not used, R
S
is not nec-
essary. R
S
prevents MOSFET self-oscillations that can
occur when C
GATE
is high while C
BOARD
is low.
Electrical characteristics as specified by the manufac-
turer
’
s data sheet are:
FDS6670A: C
ISS
= 3200pF, Q
T
(MAX) = 50nC, R
DS(ON)
=
8.2m
IRF7401: C
ISS
= 1600pF, Q
T
(MAX) = 48nC, R
DS(ON)
=
22m
MMSF5N03HD: C
ISS
= 1200pF, Q
T
(MAX) = 21nC,
R
DS(ON)
= 40m
Figure 7. Fast Comparator Threshold vs. RTH
0
200
100
400
300
500
600
700
800
0
20
30
10
40
50
60
70
80
FAST COMPARATOR THRESHOLD
VOLTAGE vs. RTH
RTH (k
)
V
T
,
F
RTH (k
) = V
TH
,
FC
(mV)/10
INDETERMINATE,
NOT RECOMMENDED FOR
RTH
< 5k
DISABLED FOR
RTH < 200
*MAX4273 retry feature disabled by connecting CTIM to V
IN
.
Table 5. Startup and Retry Timing Parameters
t
ON
EXTERNALLY SET
t
ON
(ms) = 0.31 x
CTIM
(nF)
t
ON
(ms) = 0.31 x
CTIM
(nF)
t
ON
(ms) = 0.31 x
CTON
(nF)
t
RETRY
EXTERNALLY SET
No retry available
t
RETRY
(ms) = 32 x t
ON
= 10 x
CTIM
(nF)
t
RETRY
(ms) =10 x
CTIM
(nF)
PART
DEFAULT (μs)
10
10
10
DEFAULT (μs)
MAX4271
MAX4272
MAX4273*
320
320
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4273EEE+ | 功能描述:熱插拔功率分布 3-12V Current-Limit 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 |
| MAX4273EEE+T | 功能描述:熱插拔功率分布 3-12V Current-Limit 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 |
| MAX4273EEE-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 |
| MAX4273ESE | 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 |
| MAX4273ESE+ | 功能描述:熱插拔功率分布 3-12V Current-Limit 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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