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參數(shù)資料
| 型號(hào)： | MAX5921 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | -48V Hot-Swap Controllers with External Rsense and High Gate Pulldown Current |
| 中文描述： | -48V熱插拔控制器，外置RSENSE、提供較高的柵極下拉電流 |
| 文件頁(yè)數(shù)： | 8/18頁(yè) |
| 文件大?。?/td> | 313K |
| 代理商： | MAX5921 |
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M
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
8
_______________________________________________________________________________________
Detailed Description
The MAX5921/MAX5939 integrated hot-swap controllers
for -48V power systems allow circuit boards to be safely
hot plugged into a live backplane without causing a
glitch on the power-supply rail. When circuit boards are
inserted into a live backplane, the bypass capacitors at
the input of the board
’
s power module or switching
power supply can draw large inrush currents as they
charge. Uncontrolled inrush currents can cause glitches
on the system power supply and damage components
on the board.
The MAX5921/MAX5939 provide a controlled turn-on to
circuit cards preventing damage to connectors, board
components, and prevent glitches on the power-supply
rail. Both the MAX5921/MAX5939 provide undervolt-
age, overvoltage, and overcurrent protection. The
MAX5921/MAX5939 ensure that the input voltage is sta-
ble and within tolerance before applying power to the
load. The device also provides protection against input
voltage steps by limiting the load current to a safe level
without turning off power to the load.
Pin Description
PIN
MAX5921A/
MAX5921E
MAX5939A/
MAX5939E
MAX5921B/
MAX5921F
MAX5939B/
MAX5939F
NAME
FUNCTION
1
—
PWRGD
Power-Good Signal Output.
PWRGD
is an active-low open-drain status output referenced
to V
EE
.
PWRGD
latches low when V
DRAIN
- V
EE
≤
V
DL
and V
GATE
>
V
GATE
indicating a
power-good condition.
PWRGD
is open drain otherwise.
—
1
PWRGD
Power-Good Signal Output. PWRGD is an active-high open-drain status output refer-
enced to DRAIN. PWRGD latches in a high-impedance state when V
DRAIN
- V
EE
≤
V
DL
and V
GATE
>
V
GATE
- V
GH
indicating a power-good condition. PWRGD is pulled low to
DRAIN otherwise.
2
2
OV
Overvoltage Detection Input. OV is referenced to V
EE
. When OV is pulled above V
OVH
voltage, GATE pulls low. GATE remains low until the OV voltage reduces to V
OVH
-
V
OVHY
.
Undervoltage Detection Input. UV is referenced to V
EE
. When UV is pulled above V
UVH
voltage, the GATE is enabled. When UV is pulled below V
UVL
, GATE pulls low.
UV is also used to reset the circuit breaker after a fault condition. To reset the circuit
breaker, pull UV below V
UVL
. The reset command can be issued immediately after a fault
condition; however, the device will not restart until a t
OFF
delay time has elapsed after the
fault condition is removed.
Negative Power-Supply Input. Connect to the negative power-supply rail.
3
3
UV
4
4
V
EE
5
5
SENSE
Current-Sense Input. Connect to the external sense resistor and the source of the external
MOSFET. The voltage drop across the external sense resistor is monitored to detect
overcurrent or short-circuit fault conditions. Connect SENSE to V
EE
to disable the current-
limiting feature.
6
6
GATE
Gate Drive Output. Connect to the gate of the external N-channel MOSFET.
7
7
DRAIN
Output Voltage Sense Input. Connect to the output voltage node (drain of external N-
channel MOSFET). Place the MAX5921/MAX5939 such that DRAIN is close to the drain of
the external MOSFET for the best thermal protection.
8
8
V
DD
Positive Power-Supply Input. This is the power ground in the negative supply voltage
system. Connect to the higher potential of the power-supply inputs.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5921AESA | 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 |
| MAX5921AESA+ | 功能描述:熱插拔功率分布 48V- 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 |
| MAX5921AESA+T | 功能描述:熱插拔功率分布 48V- 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 |
| MAX5921AESA-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 |
| MAX5921AEVKIT | 功能描述:熱插拔功率分布 Evaluation Kit for the MAX5920 MAX5921 MAX5939 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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