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參數(shù)資料
| 型號(hào)： | MAX4370 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection |
| 中文描述： | 電流調(diào)節(jié)熱插拔控制器，帶有DualSpeed/BiLevel故障保護(hù) |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 226K |
| 代理商： | MAX4370 |
M
Current-Regulating Hot-S wap Controller with
DualS peed/BiLevel Fault Protec tion
10
______________________________________________________________________________________
S tatus Output
The status output is an open-drain output that goes low
when the part is:
1) in start-up
2) forced off (on = GND)
3) in an overcurrent condition, or
4) latched off.
STAT is high only if the part is in normal mode and no
faults are present (Table 1). Figure 4 shows the STAT
timing diagram.
Over/Undervoltage Loc kouts
The undervoltage lockout prevents the MAX4370 from
turning on the external MOSFET until the input voltage
at V
IN
exceeds the lockout threshold (2.25V min) for at
least 150ms. The undervoltage lockout protects the
external MOSFET from insufficient gate drive voltage.
The 150ms timeout ensures that the board is fully
plugged into the backplane and that V
IN
is stable.
Voltage transients at V
IN
with voltages below the UVLO
will reset the device and initiate a start-up sequence.
The device also features a gate overvoltage lockout
that prevents the device from restarting after a fault
condition if the discharge has not been completed.
V
GATE
must be discharged to below 0.1V before
restarting. Since the MAX4370 does not monitor the
output voltage, a start-up sequence can be initiated
while the board capacitance is still charged.
Gate Overvoltage Protec tion
Newer-generation MOSFETs have an absolute maxi-
mum rating of ±8V for the gate-to-source voltage (V
GS
).
To protect these MOSFETs, the MAX4370 limits the
gate-to-drain (V
GD
) to +7.5V with an internal zener
diode. No protection is provided for negative V
GD
. If
GATE can be discharged to GND faster than the output
voltage, an external small-signal protection diode (D1)
can be used, as shown in Figure 5.
Table 1. Status Output Truth Table
PART IN
START-UP
X
Yes
No
No
ON PIN
OVERCURRENT
CONDITION ON V
IN
X
X
X
X
X
PART IN LATCHED-OFF MODE
DUE TO OVERCURRENT
CONDITION
Low
Low
Low
Low
High
STAT PIN
(STATUS)
Low
High
Yes
No
No
Yes
No
High
High
No
No
OV
1.2V
OV
OV
STAT
CTIM
ON
FAULT
CONDITION
OR ON
FALLING EDGE
NOFAULT CONDITIONS
PRESENT
V
IN
V
IN
Figure 4. Status Output (STAT) Timing Diagram
D1
GATE
R
SENSE
V
OUT
V
GD
V
GS
C
BOARD
V
IN
V
SEN
M1
N
MAX4370
GATE DRIVE
CHARGE PUMP
Figure 5. External Gate-Source Protection
X = Don’t care
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4370ESA | 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 |
| MAX4370ESA+ | 功能描述:熱插拔功率分布 Current-Regulating 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 |
| MAX4370ESA+T | 功能描述:熱插拔功率分布 Current-Regulating 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 |
| MAX4370ESA-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 |
| MAX4372FEBT | 制造商:Maxim Integrated Products 功能描述:UCSP/SOT23, MICROPOWER, HIGH-SIDE CURRENT-SENSE AMP - Rail/Tube |
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