Datasheet > MAX5986A

MAX5986A

更新时间： 2023-12-20 18:44:58

品牌	Logo	应用领域
亚德诺 - ADI		DC-DC转换器光电二极管
页数	文件大小	规格书
23页	1015K
描述
兼容于IEEE 802.3af的高效、Class 1//Class 2 PD，内置DC-DC转换器

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数据手册

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MAX5986A 数据手册

EVALUATION KIT AVAILABLE

Click here for production status of speciﬁc part numbers.

MAX5986A–MAX5986C/

MAX5987A

IEEE 802.3af-Compliant, High-Efficiency,

Class 1/Class 2, PDs with Integrated

DC-DC Converter

General Description

The MAX5986A–MAX5986C/MAX5987A provide

Beneﬁts and Features

● High Integration Saves Space and BOM Cost

• Eﬃcient, Integrated DC-DC Converter (with

Integrated Switches)

complete power-supply solution as IEEE 802.3af-

compliant Class 1/Class 2 Powered Devices (PDs) in a

Power-over-Ethernet (PoE) system. The devices integrate

the PD interface with an efficient DC-DC converter, offering

a low external part count PD solution. The MAX5987A

includes a low-dropout regulator and the MAX5986A–

MAX5986C include sleep and ultra-low power modes.

• Built-In Output-Voltage Monitoring

• Protects Against Overload, Output Short Circuit,

Output Overvoltage, and Overtemperature

• Integrated TVS Diode Withstands Cable

Discharge Event (CDE)

• Internal LDO Regulator with Up to 100mA Load

(MAX5987A)

The PD interface provides a detection signature and

a Class 1/Class 2 classification signature with a single

external resistor. The PD interface also provides an

isolation power MOSFET, a 60mA (max) inrush current

limit, and a 323mA operating current limit.

● IEEE 802.3af-Compliant Features Reduce Design Time

• PoE Class 1/Class 2 Classiﬁcation Set with

Single Resistor

• Intelligent Maintain Power Signature (MPS)

Complies with IEEE 802.3af Speciﬁcation

• Simpliﬁed Wall Adapter Interface

The integrated step-down DC-DC converter uses a peak

current-mode control scheme and provides an easy-to-

implement architecture with a fast transient response.

The step-down converter operates in a wide input voltage

range from 8.7V to 60V and supports up to 6.49W

of input power. The MAX5986A/MAX5986B/MAX5987A

operate at a fixed 215kHz switching frequency and

the MAX5986C operates at a fixed 430kHz switching

frequency. The DC-DC converter operates at a fixed

switching frequency, with an efficiency-boosting

frequency foldback that reduces the switching frequency

by half at light loads.

• Pass 2kV, 200m CAT-6 Cable Discharge Event

● High Efficiency During Light Loads Reduces Power

Consumption

• Sleep and Ultra-Low-Power Mode (MAX5986A/

MAX5986B/MAX5986C)

• Frequency Foldback for High-Eﬃciency Light-Load

Operation

• Back-Bias Capability to Optimize the Eﬃciency

● Robust Performance

• 8.7V to 60V Wide Input Voltage Range

• Hiccup-Mode Runaway Current Limit

• 49mA (typ) Inrush Current Limit

• Open-Drain RESET Output (MAX5987A)

The devices feature an input undervoltage-lockout

(UVLO) with wide hysteresis and long deglitch time

to compensate for twisted-pair cable resistive drop

and to assure glitch-free transition during power-on/off

conditions. The devices also feature overtemperature

shutdown, short-circuit protection, output overvoltage

protection, and hiccup current limit for enhanced perfor-

mance and reliability.

● Flexible and Easy to Design With

• 3.0V to 14V Programmable Output Voltage Range

• Internal Compensation

• Fixed 215kHz/430kHz Switching Frequency

• Fixed 3.3V or Adjustable Output Voltage through

an External Resistive Divider

The MAX5986A–MAX5986C/MAX5987A are available

in a 16-pin, 5mm x 5mm, TQFN power package and

operate over the -40°C to +85°C temperature range.

Applications

● IEEE 802.3af-Powered Devices

● IP Phones

Ordering Information appears at end of data sheet.

● Wireless Access Nodes

● IP Security Cameras

● WiMAX Base Stations

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

WiMAX is a registered certification mark and registered service

mark of WiMAX Forum.

19-6261; Rev 7; 11/18

12 3 4 5 6 7...23

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与MAX5986A相关器件

型号	品牌	获取价格	描述	数据表
MAX5986A_13	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, PDs with Integrated DC-DC Conver
MAX5986AETE	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1,Powered Devices with Integrated DC-DC Con
MAX5986AETE+	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1,Powered Devices with Integrated DC-DC Con
MAX5986B	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, PDs with Integrated DC-DC Conver
MAX5986B	ADI	获取价格	兼容于IEEE 802.3af的高效、Class 1//Class 2 PD，内置DC-D
MAX5986BETE+	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, PDs with Integrated DC-DC Conver
MAX5986C	ADI	获取价格	兼容于IEEE 802.3af的高效、Class 1//Class 2 PD，内置DC-D
MAX5986CETE+	MAXIM	获取价格	Switching Regulator,
MAX5987A	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1,Powered Devices with Integrated DC-DC Con
MAX5987A	ADI	获取价格	兼容于IEEE 802.3af的高效、Class 1//Class 2 PD，内置DC-D

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