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參數(shù)資料
| 型號(hào)： | MAX5903LAETT+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 333K |
| 描述： | IC HOT-SWAP CONTROLLER 6-TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | Simple Swapper™ |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 9 V ~ 72 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-WDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 6-TDFN 裸露焊盤（3x3） |
| 包裝： | 帶卷 (TR) |
Turn-On and Turn-Off Delays
After power is applied, or ON/OFF is released, there is
a 150ms delay (t
ON
) before the gate ramp is started.
This delay is also the automatic restart time delay.
In the event of a circuit-breaker condition or an over-
temperature fault condition, the turn-off delay is less
than 4祍. An undervoltage condition must exist for at
least 10ms (t
OFF
) before the MAX5902/MAX5903 turns
off the external MOSFET. ON/OFF must be held low for
at least 10ms (t
OFF
) before the MAX5902/MAX5903
turns off the external MOSFET. Turn-off delay minimizes
spurious shutdowns due to noisy signals or momentary
voltage spikes, as well as preventing accidental reset-
ting of the circuit-breaker latch (MAX5902L/MAX5903L).
Thermal Shutdown
A thermal shutdown feature helps protect the external
MOSFET. If the die temperature of the MAX5902/
MAX5903 exceeds +125癈, the MOSFET is turned off.
For accurate performance the MAX5902/MAX5903
must be in close thermal contact with the external MOS-
FET. See the Layout Guidelines section for information.
Due to the low power dissipation of the
MAX5902/MAX5903, its junction temperature will typi-
cally be within a few degrees of the MOSFET. All ver-
sions of the MAX5902/MAX5903 automatically restart
from a temperature fault when the junction temperature
drops below +110癈.
Undervoltage Lockout
The MAX5902/MAX5903 turns off the external MOSFET
if the magnitude of the input voltage is below the level
set by ON/OFF for longer than 10ms (t
OFF
). If ON/OFF
is left unconnected, the lockout voltage (V
UVLO
)
defaults to 31.5V. V
UVLO
may also be set to any value
within the power-supply range by using external resis-
tors. To set the lockout voltage to a value between +9V
and +72V use a resistor divider connected between V
S
and GND, with the center node of the divider connect-
ed to ON/OFF. For example, use a 3k& resistor (R1 in
Figure 3) from ON/OFF to GND and calculate the other
resistor, R2, using:
where V
UVLO
is the desired lockout voltage, and
V
ON/OFF
is the ON/OFF reference threshold specified in
the Electrical Characteristics table (typically 1.26V).
Figure 3 shows an example circuit with V
UVLO
set for
+18V. To defeat the UVLO simply connect a single
100k& resistor between ON/OFF and V
S
, as shown in
Figure 6.
The Power-Good Output
The power-good output, PGOOD (PGOOD), is open-
drain and asserts when the external MOSFET is fully
enhanced and V
SD
is less than the circuit-breaker
threshold (V
CB
). For versions without the circuit-breaker
function (MAX5902N/MAX5903N), PGOOD (PGOOD)
asserts when the external MOSFET is fully enhanced.
PGOOD (PGOOD) deasserts within 4祍 when a circuit-
breaker event occurs or if the die temperature exceeds
+125癈. PGOOD (PGOOD) deasserts if V
S
< V
UVLO
for
longer than 10ms or ON/OFF is held low for longer than
10ms.
The MAX5902 PGOOD is active-low and the MAX5903
PGOOD is active-high. Both are open-drain n-channel
MOSFETs with their sources connected to GND, and
can withstand up to +72V.
R
R
V
V
UVLO
ON OFF
2
1
1
=
?/DIV>
?/DIV>
?/DIV>
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
/
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
Controllers
8 _______________________________________________________________________________________
HOT-SWAP CONTROLLER
+9V TO +72V
V
S
GND
100k&
MAX5902
GND
ON/OFF
Figure 6. Defeating Undervoltage Lockout
HOT-SWAP CONTROLLER
5V LOGIC
GND
LOGIC CONTROL OF 3.3V OR LESS MAY BE CONNECTED
DIRECTLY TO THE MAX5902/MAX5903. FOR 5V LOGIC
CONTROL INSERT A SERIES 47k& RESISTOR AS SHOWN.
47k&
MAX5902
MAX5903
GND
ON/OFF
Figure 5. Logic Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5903LAEUT | 制造商:Maxim Integrated Products 功能描述:SIMPLE SWAPPER HOT-SWAP SWITCHES - Rail/Tube |
| MAX5903LAEUT+ | 制造商:Maxim Integrated Products 功能描述:+72V SOT23/TDFN SIMPLE SWAPPER HOT-SWAP CONTROLLERS - Bulk |
| MAX5903LAEUT+T | 功能描述:熱插拔功率分布 72V 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 |
| MAX5903LAEUT-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 |
| MAX5903LBETT | 制造商:Maxim Integrated Products 功能描述:SIMPLE SWAPPER HOT-SWAP SWITCHES - Rail/Tube |
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