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| 型号： | MAX5965AUAX+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Power, Quad, Monolithic, PSE Controllers for Power over Ethernet; Package: SSOP;36 pin;163 mm² ; Temperature: 0°C to +85°C |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 8/54页 |
| 文件大小： | 1525K |
| 代理商： | MAX5965AUAX+ |
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MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
16
______________________________________________________________________________________
Detailed Description
The MAX5965A/MAX5965B are quad -48V power con-
trollers designed for use in IEEE 802.3af-compliant/IEEE
802.3at-compatible PSE. The devices provide PD discov-
ery, classification, current limit, DC and AC load discon-
nect detections in compliance with the IEEE 802.3af
standard. The MAX5965A/MAX5965B are pin compatible
with the MAX5952/MAX5945/LTC4258/LTC4259A PSE
controllers and provides additional features.
The MAX5965A/MAX5965B feature a high-power mode,
which provides up to 45W per port. The devices allow
the user to program the current-limit and overcurrent
thresholds up to 2.5 times the default thresholds. The
MAX5965A/MAX5965B can also be programmed to
decrease the current-limit and overcurrent threshold by
15% for high operating voltage conditions to keep the
output power constant.
The MAX5965A/MAX5965B provide new Class 5 and 2-
event classification (Class 6) for detection and classifica-
tion of high-power PDs. The MAX5965A/MAX5965B
provide instantaneous readout of each port current
through the I2C interface. The MAX5965A/MAX5965B
also provide high-capacitance detection for legacy PDs.
The MAX5965A/MAX5965B are fully software config-
urable and programmable through an I2C-compatible,
3-wire serial interface with 49 registers. The class-over-
current detection function enables system power man-
agement to detect if a PD draws more than the
allowable current. The MAX5965A/MAX5965B’s exten-
sive programmability enhances system flexibility,
enables field diagnosis, and allows for uses in other
applications.
The MAX5965A/MAX5965B provide four operating
modes to suit different system requirements. Auto mode
allows the device to operate automatically without any
software supervision. Semi-auto mode automatically
detects and classifies a device connected to a port
after initial software activation but does not power up
that port until instructed to by software. Manual mode
allows total software control of the device and is useful
for system diagnostics. Shutdown mode terminates all
activities and securely turns off power to the ports.
The MAX5965A/MAX5965B provide input undervoltage
lockout, input undervoltage detection, a load-stability
safety check during detection, input overvoltage lockout,
overtemperature detection, output voltage slew-rate limit
during startup, power-good, and fault status. The
MAX5965A/MAX5965B’s programmability includes start-
up timeout, overcurrent timeout, and load-disconnect
detection timeout.
The MAX5965A/MAX5965B communicate with the sys-
tem microcontroller through an I2C-compatible inter-
face. The MAX5965A/MAX5965B feature separate input
and output data lines (SDAIN and SDAOUT) for use
with optocoupler isolation. As slave devices, the
MAX5965A/MAX5965B include four address inputs
allowing 16 unique addresses. A separate INT output
and four independent shutdown inputs (SHD_) provide
fast response from a fault to port shutdown between
the MAX5965A/MAX5965B and the microcontroller. A
RESET input allows hardware reset of the device.
Reset
Reset is a condition the MAX5965A/MAX5965B enter
after any of the following conditions:
1) After power-up (VEE and VDD rise above their
UVLO thresholds).
2) Hardware reset. The RESET input is driven low and
back high again any time after power-up.
3) Software reset. Writing a 1 into R1Ah[4] any time
after power-up.
4) Thermal shutdown.
During a reset, the MAX5965A/MAX5965B reset their
register map to the reset state as shown in Table 37
and latch in the state of AUTO (pin 35) and MIDSPAN
(pin 2). During normal operation, change at the AUTO
and MIDSPAN input is ignored. While the condition that
caused the reset persists (i.e. high temperature, RESET
input low, or UVLO conditions) the MAX5965A/
MAX5965B do not acknowledge any addressing from
the serial interface.
Port Reset (R1Ah[3:0])
Set high anytime during normal operation to turn off
power and clear the events and status registers of the
corresponding port. Port reset only resets the events
and status registers.
Midspan Mode
In midspan mode, the device adopts cadence timing
during the detection phase. When cadence timing is
enabled and a failed detection occurs, the port waits
between 2s and 2.4s before attempting to detect again.
Midspan mode is activated by setting R11h[1] high.
The status of the MIDSPAN pin is written to R11h[1]
during power-up or after a reset. MIDSPAN is internally
pulled low by a 50k
resistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5965AUAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5965AUAX+T | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5965BCAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5965BCAX+T | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER, QUAD, MONOLITHIC, PSE CONTROLLERS FOR POWER OVER - Tape and Reel |
| MAX5965BEAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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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