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| 型號(hào)： | MAX4370ESA+T |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 432K |
| 描述： | IC CNTRLR HOT-SWAP 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開(kāi)關(guān)： | 無(wú) |
| 電源電壓： | 2.7 V ~ 13.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
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Current-Regulating Hot-Swap Controller with
DualSpeed/BiLevel Fault Protection
8 _______________________________________________________________________________________
Detailed Description
The MAX4370 is a circuit-breaker IC designed for hot-
swap applications where a card or board is to be
inserted into a rack with the main system power supply
turned on. Normally, when a card is plugged into a live
backplane, the card is discharged filter capacitors pro-
vide a low impedance, which can momentarily cause
the main power supply to collapse. The MAX4370 is
designed to reside either in the backplane or in the
removable card to provide inrush-current limiting and
short-circuit protection. This is achieved using a charge
pump as gate drive for an external N-channel MOSFET,
an external current-sense resistor, and two on-chip
comparators. Figure 1 shows the devices functional
diagram.
The slow comparator response time and the start-up
timer can be adjusted with external capacitors. The tim-
ing components are optional; without them the part is
set to its nominal values, as shown in the Electrical
Characteristics.
Start-Up Period
CTIM sets the start-up period. This mode starts when
the power is first applied to V
IN
if ON is connected to
V
IN
, or at the rising edge of ON. In addition, the voltage
at V
IN
must be above the undervoltage lockout for
150ms (see Undervoltage Lockout).
During start-up, the slow comparator is disabled and
current limiting is provided two different ways:
1) Slow ramping of the current to the load by controlling
the external MOSFET gate voltage.
2) Limiting the current to the load by regulating the volt-
age across the external current-sense resistor.
Unlike other circuit-breaker ICs, the MAX4370 hot-swap
controller regulates the current to a preset level instead
of completely turning off if an overcurrent occurs during
start-up.
In start-up mode, the gate drive current is limited to
100礎(chǔ) and decreases with the increase of the gate
voltage (see Typical Operating Characteristics ). This
allows the MAX4370 to slowly enhance the MOSFET. If
the fast comparator detects an overcurrent, the gate
voltage is momentarily discharged with a fixed 80 礎(chǔ)
current until the load current through the sense resistor
(R
SENSE
) decreases below its threshold point. This
effectively regulates the turn-on current during start-up.
Figure 2 shows the start-up waveforms. STAT goes
high at the end of the start-up period if no fault condi-
tion is present.
Normal Operation (DualSpeed/BiLevel)
In normal operation (after the start-up period has
expired), protection is provided by turning off the exter-
nal MOSFET when a fault condition is encountered.
DualSpeed/BiLevel fault protection incorporates two
comparators with different thresholds and response
times to monitor the load current:
1) Slow Comparator. This comparator has an externally
set response time (20祍 to seconds) and a fixed
50mV threshold voltage. The slow comparator
ignores low-amplitude momentary current glitches.
After an extended overcurrent condition, a fault is
detected and the MOSFET gate is discharged.
2) Fast Comparator. This comparator has a fixed
response time and a higher 200mV threshold volt -
age. The fast comparator turns off the MOSFET
immediately after it detects a large amplitude event
such as a short circuit.
In each case, when a fault is encountered, the status
pin (STAT) goes low and the MAX4370 stays latched
off. Figure 3 shows the waveforms after a fault condi -
tion.
t
START
t
ON
~V
IN
V
GATE
I
FAST, SET
V
GATE
STAT
ON
V
TH
V
OUT
C
BOARD
= LARGE
C
BOARD
= 0
V
OUT
I
LOAD
Figure 2. Start-Up Waveforms
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| MAX4372FEBT | 制造商:Maxim Integrated Products 功能描述:UCSP/SOT23, MICROPOWER, HIGH-SIDE CURRENT-SENSE AMP - Rail/Tube |
| MAX4372FEBT+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX4372FEBT+T | 功能描述:特殊用途放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX4372FEBT+TG45 | 功能描述:特殊用途放大器 Low-Cost UCSP/SOT23 Micropower High-Side Current-Sense Amplifier with Voltage Output RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX4372FEBT-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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