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參數(shù)資料
| 型號： | MAX4272ESA |
| 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, PDSO8 |
| 封裝： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大小： | 407K |
| 代理商： | MAX4272ESA |
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
16
______________________________________________________________________________________
configured in automatic retry mode (see
MOSFET
Thermal Considerations
)
.
Using the MAX4271/MAX4273 in latched mode allows
the consideration of MOSFETs with higher R
DS(ON)
and
lower power ratings. A MOSFET can typically withstand
single-shot pulses with higher dissipation than the
specified package rating. Low MOSFET gate capaci-
tance is not necessary since the inrush current limiting
is achieved by limiting the gate dv/dt. Table 3 lists
some recommended manufacturers and components.
Sense Resistor
The slow comparator threshold voltage is set at 50mV.
Select a sense resistor that causes a 50mV voltage
drop at a current level above the maximum normal
operating current; typically, set the overload current at
1.2 to 1.5 times the nominal load current. The fast com-
parator threshold is typically set at 200mV. This will set
the fault current limit at four times the overload current
limit. The MAX4273 fast comparator threshold can be
set between 50mV and 750mV; see Table 4 for a
detailed listing.
Choose the sense resistor power rating according to
the device configuration. If no retry mode is selected,
P
RSENSE
= (I
OVERLOAD
)
2
x R
SENSE
; if retry is selected,
then P
RSENSE
= (I
FAULT
)
2
x R
SENSE
x (t
ON
/t
RETRY
).
Fast Comparator Threshold (RTH) (MAX4273)
The fast comparator threshold is determined by the
external resistor connected at RTH. To select threshold
voltages between 50mV and 750mV, use resistor val-
ues between 5k
and 75k
according to Figure 7.
Resistor values between 200
and 5k
are not recom-
mended. Setting the threshold voltage of the fast com-
parator below 50mV will effectively override the slow
comparator operation. The MAX4273 fast comparator
can be disabled by shorting the RTH pin to V
IN
(V
IN
-
25mV or less). Ground RTH to set the threshold to
200mV internally.
Startup and Retry Timers (CTIM, CTON)
The startup (t
START
) and retry (t
RETRY
) timers are deter-
mined by the capacitors connected at CTIM and
CTON. The capacitor connected to CTIM has two func-
tions for the three devices as follows:
Table 4. Current Levels vs. R
SENSE
R
SENSE
(m
)
PART NUMBER
OVERLOAD THRESHOLD
SET BY SLOW COMPARATOR (A)
FAULT CURRENT THRESHOLD
SET BY FAST COMPARATOR (A)
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
5
5
1
1
20
10
5 to 75
4
1 to 15
2
0.5 to 7.5
50
0.5
0.5
100
Table 3. Component Manufacturers
COMPONENT
MANUFACTURER
Dale-Vishay
IRC
Fairchild
International Rectifier
Motorola
PHONE
402-564-3131
704-264-8861
888-522-5372
310-322-3331
602-244-3576
WEB
www.vishay.com
www.irctt.com
www.fairchildsemi.com
www.irf.com
www.mot-sps.com/ppd/
Sense Resistors
MOSFETS
DEVICE
MAX4271
MAX4272
MAX4273
CTIM FUNCTION
Startup time
Startup time and sets retry timer
Sets retry timer
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4272ESA+ | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4272ESA+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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4272ESA-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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4273EEE | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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