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參數(shù)資料
| 型號： | MAX5972AETE+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 1120K |
| 描述： | IC CONTROLLER INTERFACE 16TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 以太網(wǎng)供電開關(guān)（PoE） |
| 應(yīng)用： | IP 電話，LAN 網(wǎng)絡(luò)供電，網(wǎng)絡(luò)路由器和交換機 |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 可調(diào) |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
IEEE 802.3af/at-Compliant, Powered Device Interface
Controller with Integrated Power MOSFET
_______________________________________________________________________________________ 9
Table 1. Setting Classification Current
*V
IN
is measured across the MAX5972A input V
DD
to V
SS
.
The PSE determines the class of a PD by applying
a voltage at the PD input and measuring the current
sourced out of the PSE. When the PSE applies a volt-
age between 12.6V and 20V, the MAX5972A exhibits a
current characteristic with a value shown in Table 1. The
PSE uses the classification current information to classify
the power requirement of the PD. The classification cur-
rent includes the current drawn by R
CLS
and the supply
current of the MAX5972A so the total current drawn by
the PD is within the IEEE 802.3af/at standard figures. The
classification current is turned off whenever the device is
in power mode.
2-Event Classification and Detection
During 2-event classification, a Type 2 PSE probes PD
for classification twice. In the first classification event, the
PSE presents an input voltage between 12.6V and 20.5V
and the MAX5972A presents the programmed load
I
CLASS
. The PSE then drops the probing voltage below
the mark event threshold of 10.1V and the MAX5972A
presents the mark current (I
MARK
). This sequence is
repeated one more time.
When the MAX5972A is powered by a Type 2 PSE, the
2-event identification output 2EC asserts low after the
internal isolation n-channel MOSFET is fully turned on.
2EC current sink is turned off when V
DD
goes below the
UVLO threshold (V
OFF
) and turns on when V
DD
goes
above the UVLO threshold (V
ON
), unless V
DD
goes
below V
THR
to reset the latched output of the Type 2
PSE detection flag.
Alternatively, the 2EC output also serves as a wall
adapter detection output when the MAX5972A is pow-
ered by an external wall power adapter. See the Wall
Power Adapter Detection and Operation section for more
information.
Power Mode (Wake Mode)
The MAX5972A enters power mode when V
IN
rises
above the undervoltage lockout threshold (V
ON
). When
V
IN
rises above V
ON
, the MAX5972A turns on the inter-
nal n-channel isolation MOSFET to connect V
SS
to RTN
with inrush current limit internally set to 135mA (typ). The
isolation MOSFET is fully turned on when the voltage at
RTN is near V
SS
and the inrush current is reduced below
the inrush limit. Once the isolation MOSFET is fully turned
on, the MAX5972A changes the current limit to 800mA.
The open-drain power-good output (PG) remains low for
a minimum of t
DELAY
until the power MOSFET fully turns
on to keep the downstream DC-DC converter disabled
during inrush.
Undervoltage Lockout
The MAX5972A operates up to a 60V supply voltage with
a turn-on UVLO threshold (V
ON
) at 35.4V and a turn-off
UVLO threshold (V
OFF
) at 31V. When the input voltage is
above V
ON
, the MAX5972A enters power mode and the
internal MOSFET is turned on. When the input voltage
goes below V
OFF
for more than t
OFF_DLY
, the MOSFET
turns off.
Power-Good Output
An open-drain output (PG) is used to allow disabling
downstream DC-DC converter until the n-channel isola-
tion MOSFET is fully turned on. PG is pulled low to V
SS
for a period of t
DELAY
and until the internal isolation
MOSFET is fully turned on. The PG is also pulled low
during sleep mode and coming out of thermal shutdown.
Thermal-Shutdown Protection
The MAX5972A includes thermal protection from exces-
sive heating. If the junction temperature exceeds the
thermal-shutdown threshold of +140NC, the MAX5972A
CLASS
MAXIMUM
POWER USED
BY PD
(W)
R
CLS
(I)
V
IN
*
(V)
CLASS CURRENT SEEN AT
V
IN
(mA)
IEEE 802.3at PD
CLASSIFICATION CURRENT
SPECIFICATION (mA)
MIN
MAX
MIN
MAX
0
0.44 to 12.95
615
12.6 to 20
0
4
0
5
1
0.44 to 3.94
117
12.6 to 20
9
12
8
13
2
3.84 to 6.49
66.5
12.6 to 20
17
20
16
21
3
6.49 to 12.95
43.7
12.6 to 20
26
30
25
31
4
12.95 to 25.5
30.9
12.6 to 20
36
44
35
45
5
> 25.5
21.3
12.6 to 20
52
64
51
68
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5972AEVKIT | 制造商:Maxim Integrated Products 功能描述:IEEE 802.3AF/AT-COMPLIANT POWERED DEVICE INTERFACE CONTROLLE - Boxed Product (Development Kits) |
| MAX5972BETE+ | 功能描述:熱插拔功率分布 IEEE 802.3af/at PDIC 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 |
| MAX5972BETE+T | 功能描述:熱插拔功率分布 IEEE 802.3af/at PDIC 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 |
| MAX5973BETL+ | 功能描述:監(jiān)控電路 Phase Redundancy Power Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX5973BETL+T | 功能描述:監(jiān)控電路 Phase Redundancy Power Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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