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參數(shù)資料
| 型號： | MAX5900 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | -100V SOT23 Simple Swapper Hot-Swap Controllers |
| 中文描述： | -100V、SOT23/TDFN封裝、Simple Swapper熱插拔控制器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 260K |
| 代理商： | MAX5900 |
Power-Good Output
The power-good output,
PGOOD
(PGOOD), is open-
drain and asserts when the external MOSFET is fully
enhanced and V
DS
is less than V
PG
(75% of the circuit
breaker threshold, V
CB
). For versions without the circuit
breaker function (MAX5900N/MAX5901N),
PGOOD
(PGOOD) asserts when the external MOSFET is fully
enhanced.
PGOOD
(PGOOD) deasserts within 2μs when a circuit-
breaker event occurs or if the die temperature exceeds
+125
°
C.
PGOOD
(PGOOD) deasserts if |V
EE
| < |V
UVLO
|
for longer than 20ms or ON/
OFF
is held low for longer
than 20ms.
The MAX5900
PGOOD
is active-low and the MAX5901
PGOOD is active-high. Both are open-drain N-channel
MOSFETs with their sources connected to V
EE
, and can
withstand up to 100V.
Selecting a Circuit Breaker Threshold
The MAX5900A/MAX5901A and the MAX5900L/
MAX5901L offer a circuit breaker function to protect the
external MOSFET and the load from the potentially
damaging effects of excessive current. As load current
flows through the external MOSFET, a voltage, V
DS,
is
generated from drain to source due to the MOSFET
’
s
on-resistance R
DS(ON)
. The MAX5900A/MAX5901A and
MAX5900L/MAX5901L monitor V
DS
when the external
MOSFET is fully enhanced. If V
DS
exceeds the circuit
breaker threshold, the external MOSFET is turned off
and
PGOOD
(PGOOD) is deasserted.
To accommodate different MOSFETs and different load
currents, the MAX5900/MAX5901 are available with cir-
cuit breaker threshold voltages of 200mV, 300mV, and
400mV.
The circuit breaker function is intended to disconnect
the load if a gross overcurrent or short-circuit condition
occurs. For calculating the circuit breaker threshold,
use the MOSFET
’
s R
ON
at the worst possible operating
condition, and add a 25% overcurrent margin to the
maximum circuit current. For instance, if a MOSFET has
an R
ON
of 0.06
at T
A
= +25
°
C, and a normalized on-
resistance factor of 1.75 at T
A
= +130
°
C (from the
MOSFET data sheet), the R
ON
used for calculation is
the product of these two numbers, or (0.06
) x (1.75) =
0.105
. Then, if the maximum current is expected to be
2A, using a 25% margin, the current for calculation is
(2A) x (1.25) = 2.5A. The resulting minimum circuit
breaker threshold is then the product of these two
results, or (0.105
) x (2.5A) = 0.263V. The next highest
minimum available threshold is 0.265V of the
MAX590_ _BEUT, which is an ideal choice given these
parameters. Using this method to choose a circuit
breaker threshold allows the circuit to operate under
worst-case conditions without causing a circuit breaker
fault, but the circuit breaker function will still operate if a
short-circuit or gross overcurrent condition occurs. See
Table 1 for MOSFET suggestions. The MAX5900N/
MAX5901N have no circuit breaker function. For these
parts choose an external MOSFET that meets the load
requirements.
Determining Inrush Current
Determining a circuit
’
s inrush current is necessary to
help choose the proper MOSFET. The MAX5900/
MAX5901 regulate the inrush current by means of con-
trolling the load voltage slew rate, but inrush current is
also a function of load capacitance. Determine inrush
current using:
where C is the load capacitance, and SR is the
MAX5900/MAX5901 Load Voltage Slew Rate
Magnitude from the
Electrical Characteristics
table. For
example, assuming a load capacitance of 100μF, and
using the typical value of 10V/ms for the slew rate, the
inrush current is 1A typical.
If the maximum possible Load Voltage Slew Rate is
used, the maximum inrush current calculates to 1.7A.
Choose a MOSFET with a maximum pulsed current
specification that exceeds the maximum inrush current.
M
100V SOT23 Simple Swapper Hot-Swap
Controllers
8
_______________________________________________________________________________________
M A XIM U M
I
LOA D
( A
SU GG ESTED
EXTER N AL
M O SF ET
SU GG ESTED
M A XIM PA R T
0.25
0.5
1
2
3
4
IRFL110
IRFL4310
IRFR3910
IRF540NS
IRF1310NS
IRF1310NS
M AX 590_ _C E U T
M AX 590_ _BE U T
M AX 590_ _C E U T
M AX 590_ _BE U T
M AX 590_ _BE U T
M AX 590_ _C E U T
Suggested External MOSFETs
V
IN
= -9V to -90V
I
S
=
=
×
CdV
dt
C
R
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5900AAETT | 制造商:Maxim Integrated Products 功能描述:SIMPLE SWAPPER HOT-SWAP CONTROLLER - Rail/Tube |
| MAX5900AAETT+ | 制造商:Maxim Integrated Products 功能描述:SIMPLE SWAPPER HOT-SWAP CONTROLLER - Rail/Tube |
| MAX5900AAETT+G05 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5900AAETT+T | 功能描述:熱插拔功率分布 100V- 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 |
| MAX5900AAETT+TG05 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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