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參數(shù)資料
| 型號(hào)： | MAX4273EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PTICH, M0-137, QSOP-16 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 407K |
| 代理商： | MAX4273EEE |
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
______________________________________________________________________________________
15
is stable. Any input voltage transient at IN below the
UVLO threshold will reset the device and initiate a start-
up sequence.
These devices also have an overvoltage lockout
(OVLO) feature that prevents the device from restarting
after a fault condition if the discharge has not been
completed. V
GATE
has to be discharged to below 0.1V.
Additionally, the MAX4273 LLMON pin discharges the
load line with a 1k
pulldown and prevents startup until
the load voltage is below 0.1V.
Since the MAX4271/MAX4272 do not monitor the output
voltage, a startup sequence can be initiated while the
board capacitance is still charged.
A large board capacitance or a short startup period may
prevent the MAX4272 from charging completely in one
startup period. The MAX4272 responds to these condi-
tions by charging the capacitor with bursts defined by a
t
ON
duty cycle and a period of t
ON
+ t
RETRY
. The charg-
ing will be complete after several retries unless the resis-
tive load or current load excessively discharges the
board capacitance during the retry timeout. This feature
applies to the MAX4273 if LLMON is left floating or is
connected to GND. To prevent multiple charging bursts,
ensure that the t
ON
timer exceeds the minimum time
required to complete the charge of the board capaci-
tance (see
Component Selection
).
Gate Overvoltage Protection
New-generation MOSFETs have an absolute maximum
rating of ±8V for the gate-to-source voltage (V
GS
). To
protect these MOSFETs, the MAX4271/MAX4272 limit the
gate-to-drain voltage (the MAX4273 limits the gate-to-
source voltage) to +7.5V with an internal zener diode. No
protection is provided for negative V
GS
(MAX4271/
MAX4272). If GATE can be discharged to ground faster
than the output voltage, an external small-signal protec-
tion diode (D1) can be used, as shown in Figure 6. The
MAX4273 has the protection diode internal.
Applications Information
Component Selection
N-Channel MOSFET
Select the external N-channel MOSFET according to
the application
’
s current level. Table 2 lists some rec-
ommended components. The MOSFET
’
s on-resistance
(R
DS(ON)
) should be chosen low enough to have a min-
imum voltage drop at full load to limit the MOSFET
power dissipation. High R
DS(ON)
can cause output rip-
ple if the board has pulsing loads or triggers an exter-
nal undervoltage reset monitor at full load. Determine
the device power-rating requirement to accommodate
a short circuit on the board at startup with the device
Figure 5. Status (STAT) Output Timing Diagram
O
1.2V
t
START
O
O
STAT
CTIM
(CTON)*
ON
FAULT CONDITION,
OR ON FALLING
EDGE
NO FAULT CONDITIONS PRESENT
*MAX4273 ONLY
V
IN
V
IN
Table 2. Recommended N-Channel
MOSFETs
PART
NUMBER
IRF7413
IRF7401
IRL3502S
MMSF3300
MMSF5N02H
MTB60N05H
FDS6670A
NDS8426A
FDB8030L
MANUFACTURER
DESCRIPTION
11m
, 8 SO, 30V
22m
, 8 SO, 20V
6m
, D2PAK, 20V
20m
, 8 SO, 30V
30m
, 8 SO, 20V
14m
, D2PAK, 50V
10m
, 8 SO, 30V
13.5m
, 8 SO, 20V
4.5m
, D2PAK, 30V
International
Rectifier
Motorola
Fairchild
Figure 6. External Gate-Source Protection
D1
GATE
R
SENSE
V
OUT
V
GD
V
GS
C
BOARD
IN
SENSE
M1
N
MAX4271
MAX4272
GATE DRIVE
CHARGE PUMP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4273ESE | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| MAX4271 | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| MAX4271-MAX4273 | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| MAX4271ESA | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| MAX4272ESA | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4273EEE+ | 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 |
| MAX4273EEE+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 |
| MAX4273EEE-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 |
| MAX4273ESE | 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 |
| MAX4273ESE+ | 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 |
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