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参数资料
| 型号： | MAX5981AETE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/16页 |
| 文件大小： | 1328K |
| 描述： | IC CTRLR PD IEEE 802.3AF 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 以太网供电控制器 PD 开关（PoE） |
| 应用： | 供电设备（PSE） |
| 内部开关： | 是 |
| 电流限制： | 720mA 至 880mA |
| 电源电压： | 31 V ~ 60 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
12 _____________________________________________________________________________________
Type 2 PSE detection flag. Alternatively, the 2EC output
also serves as a wall adapt er detection output when the
MAX5981A/MAX5981B are powered by an external wall
power adapter. See the Wall Power Adapter Detection
and Operation section for more information.
Power Mode (Wake Mode)
The MAX5981A/MAX5981B enter power mode when V
IN
rises above the undervoltage lock out threshold (V
ON
).
When V
IN
rises above V
ON
, the MAX5981A/MAX5981B
turn on the internal n-channel isolation MOSFET to con-
nect V
SS
to RTN with inrush current limit internally set
to 135mA (typ). The iso lation MOSFET is fully turned on
when the voltage at RTN is near V
SS
and the inrush cur-
rent is reduced below the inrush limit. Once the isolation
MOSFET is fully turned on, the MAX5981A/MAX5981B
change the cur rent 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 MAX5981A/MAX5981B operate 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 MAX5981A/MAX5981B
enter power mode and the inter nal MOSFET is turned on.
When the input voltage goes below V
OFF
for more than
t
OFF_DLY
, the MOSFET turns off.
Sleep and Ultra-Low-Power Sleep Modes
The MAX5981A/MAX5981B feature a sleep mode, which
pulls PG low while keeping the internal n-channel isola-
tion MOSFET turned on. The PG output is used to dis-
able downstream DC-DC converters reducing the power
consumption of the overall PD system in sleep mode. In
sleep mode, the LED driver output (LED) sources peri-
odic current pulses. The LED current I
LED
is set by an
external resistor R
SL
, see the Applications Information
section for more information.
An ultra-low-power sleep mode allows the MAX5981A/
MAX5981B to further reduce power consumption while
maintaining the power signature of the standard. The
ultra-low-power enable input ULP is internally held high
with a 50kI pullup resistor to the internal 5V bias of the
MAX5981A/MAX5981B. Set ULP to logic-low and apply a
falling edge to SL to enable ultra-low-power sleep mode.
Apply a falling edge on the wake-mode enable input
(WK) to disable sleep or ultra-low-power sleep mode and
resume normal operation.
LED Driver
The MAX5981A/MAX5981B drive an LED connected
from the output LED to V
SS
. During sleep mode/ultra-low-
power sleep mode, the LED is driven by current pulses
with the amplitude set by the resistor connected from SL
to V
SS
. The LED driver current ampli tude is program-
mable from 10mA to 20mA using R
SL
according to the
following formula:
LED
645.75
I
(inamperes)
R
1200
=
+
SL
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 MAX5981A/MAX5981B include thermal protection
from excessive heating. If the junction tempera ture
exceeds the thermal-shutdown threshold of +140NC,
the MAX5981A/MAX5981B turn off the internal power
MOSFET, LED driver, and 2EC current sink. When the
junction temperature falls below +112NC, the device
enters inrush mode and then return to power mode.
Inrush mode ensures the downstream DC-DC converter
is turned off as the internal power MOSFET is turned on.
Wall Power Adapter Detection and Operation
For applications where an auxiliary power source such
as a wall power adapter is used to power the PD,
the MAX5981A/MAX5981B feature wall power adapter
detection. The MAX5981A/MAX5981B give highest prior-
ity to the WAD and smooth ly switch the power supply to
WAD when it is detected. Once the input voltage (V
DD
-
V
SS
) exceeds the mark event threshold, the MAX5981A/
MAX5981B enable wall adapter detection. The wall
power adapt er is connected from WAD to RTN. The
MAX5981A/MAX5981B detect the wall power adapter
when the voltage from WAD to RTN is greater than 9V.
When a wall power adapter is detected, the internal
n-channel isolation MOSFET turns off, 2EC current sink
turns on, and classification current is disabled if V
IN
is in
the classification range.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5981AEVKIT# | 制造商:Maxim Integrated Products 功能描述:EVKIT FOR POWERED DEVICE INTERFACE CONTROLLERS WITH INTEGRAT - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:KIT EVAL INTERFACE CONTROLLER |
| MAX5981BETE+ | 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5981BETE+T | 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5982AETE+ | 功能描述:热插拔功率分布 PDIC, up to 70W RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5982AETE+T | 功能描述:热插拔功率分布 PDIC, up to 70W RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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