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參數(shù)資料
| 型號： | MAX5984AETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR PD IEEE W/MOSFT 28TQFN |
| 標準包裝： | 2,500 |
| 系列： | * |
18 _____________________________________________________________________________________
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Digital Logic
The MAX5984 internally generates digital supplies (ref-
erenced to VEE) to power the internal logic circuitry. All
logic inputs and outputs are referenced to VEE. See the
Electrical Characteristics table for digital input thresh-
olds. If digital logic inputs are driven externally, the
nominal digital logic level is 3.3V.
Undervoltage and Overvoltage Protection
The MAX5984 contains undervoltage and overvoltage
protection features. An internal VEE undervoltage lockout
(VEE_UVLO) circuit keeps the port off and the MAX5984 in
reset until VAGND - VEE exceeds 28.5V (typ) for more than
2.5ms. An internal VEE overvoltage (VEE_OV) circuit shuts
down the port when (VAGND - VEE) exceeds 62.5V (typ).
DC Disconnect Monitoring
Force OSC to VEE and power or reset the device to acti-
vate DC load-disconnect monitoring. If IRSENSE (the cur-
rent across RSENSE) falls below the DC load-disconnect
threshold, IDCTH, for more than tDISC, the device turns
off port power.
AC Disconnect Monitoring
The MAX5984 features AC load-disconnect monitoring.
Bypass OSC with a 100nF (Q10% tolerance) external
capacitor to VEE and power or reset the device to
enable AC disconnect. When AC disconnect is enabled,
a blocking diode in series to OUT and an RC circuit in
parallel to the DET diode must be used, as shown in
Figure 7.
The AC disconnect uses an internal triangle wave gen-
erator to supply the probing signal. Then the resulting
4VP-P amplitude wave is forced on DET. The common
mode of the output signal probed on DET is 5V below
AGND. If the AC current peak into DET falls below IACTH
for more than tDISC, the device powers down the port.
PWM and LED Signals
The MAX5984 includes a multifunction LED driver to
inform the user of the port status. LED is an open-drain,
multifunction output referenced to VEE and can sink up
to 10mA (typ) while driving an external LED. The LED is
turned on when the port is connected to a valid PD and
powered. If the port is not powered or is disconnected,
the LED will be off.
For two other conditions, the MAX5984 blinks a code to
communicate the port status. A series of two flashes indi-
cates an overcurrent fault occurred during port power-on,
and has a timing characteristic detailed by Figure 4. A
series of five flashes indicates that during detection an
invalid low or high discovery signature resistance was
detected and has a timing characteristic detailed by
Figure 5.
Figure 4. LED Code Timing for Overcurrent Fault During Port Power-On
Figure 5. LED Code Timing for Detection Fault Due to High- or Low-Discovery Signature Resistance
LED OFF
LED ON
223ms
LED ON
LED OFFLED OFF
74ms
223ms
PORT POWERED DOWN, DUE TO OVERCURRENT FAULT
PORT POWERED ON
PORT POWERED ON AGAIN
LED
OFF
LED
ON
223ms
74ms
LED
OFF
LED
ON
223ms
74ms
LED
OFF
LED
ON
223ms
74ms
LED
OFF
LED
ON
223ms
74ms
LED
ON
74ms
LED
OFF
1.4s
SEQUENCE REPEATS
INVALID HIGH OR LOW DISCOVERY SIGNATURE RESISTANCE DETECTED
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參數(shù)描述 |
|---|---|
| MAX5984BETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984CETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984DETI+ | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5984DETI+T | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5986AETE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 IEEE802.3 af PD w/ DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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