參數(shù)資料
型號(hào)： MAX4271
廠商： Maxim Integrated Products, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection
中文描述： 3V至12V、限流型、熱插拔控制器，帶有自動(dòng)重試以及DualSpeed/BiLevel故障保護(hù)
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 407K
代理商： MAX4271
Detailed Description
The MAX4271/MAX4272/MAX4273 are circuit breaker
ICs designed for hot-swap applications where a line
card is inserted into a live backplane. Normally, when a
line card is plugged into a live backplane, the card
’
s
discharged filter capacitors provide a low impedance
that can momentarily cause the main power supply to
collapse. The MAX4271/MAX4272/MAX4273 are
designed to reside either in the backplane or in the
removable card to provide inrush current limiting and
short-circuit protection. This is achieved by using an
external N-channel MOSFET, an external current-sense
resistor, and two on-chip comparators. Figures 1 and 2
show the functional diagrams.
The timing and voltage levels for several critical parame-
ters can be adjusted with external resistors, external
capacitors, or by pin strapping. The timing components
are optional; without them, the part is set to its nominal
values, as shown in the
Electrical Characteristics
. The
parameters that can be adjusted are:
Current-limit threshold
Slow comparator response time
Startup timer
Fast comparator threshold
Autoretry timeout period (time the part is shut down
after an overcurrent event)
Fault management (latched/autoretry)
Current overload threshold
Startup Mode
CTIM (MAX4271/MAX4272) or CTON (MAX4273) sets
the startup period (see
Startup and Retry Timers
). The
startup period begins after three conditions are met:
1) 150ms after V
IN
exceeds the UVLO threshold (see
Over/Undervoltage Lockouts
)
AND
2) 10μs after V
ON
>0.6V
AND
3) The device is no longer in retry mode.
During startup, the slow comparator is disabled and the
inrush current can be limited in two ways:
1) Slow ramping of the current to the load by control-
ling the external MOSFET gate voltage
OR
2) Limiting the current to the load by regulating the volt-
age across the external current-sense resistor
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
10
______________________________________________________________________________________
PIN
MAX4271
MAX4272
MAX4273
NAME
FUNCTION
6
11
CTIM
Startup and Retry Timers Input. Controls the startup time and the autoretry time (32x
startup time) in the MAX4272, only the autoretry time in the MAX4273, and only the
startup time in the MAX4271. Leave floating or connect the timing capacitor from CTIM
to GND. Connect to IN
for latched mode (this prevents autoretry in MAX4273). See
Startup and Retry Timers
section.
7
12
STAT
Status Output. High indicates startup completed with no fault (Table 1). STAT is an
open-drain output.
8
13
ON
ON Comparator Input. Connect high for normal operation; connect low to force the
MOSFET off. Comparator threshold V
TH,ON
= 0.6V allows for precise control over
shutdown feature. Pulse ON low for 20
μ
s min to unlatch after a fault (MAX4273 in
latched mode, or MAX4271). Negative pulses are ignored during autoretry (MAX4273
in autoretry mode, or MAX4272). See
ON and Reset Comparators
section.
—
—
14
15
REF
INC
1.2V Reference Output.
Do not bypass with a capacitor to GND.
Uncommitted Comparator Input. Controls OUTC.
Uncommitted Comparator Output. OUTC goes high 150ms after INC goes high. OUTC
goes low immediately after INC goes low. OUTC is an open-drain output.
—
16
OUTC
Pin Description (continued)
相關(guān)PDF資料
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MAX4272ESA 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4271ESA 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
MAX4271ESA+ 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
MAX4271ESA+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
MAX4271ESA-G05 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
MAX4271ESA-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
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