Datasheet > MAX5988B

MAX5988B

更新时间： 2024-10-03 14:58:19

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	901K
描述
IEEE 802.3af兼容的高效、Class 1/Class 2 PD方案，集成DC-DC转换器

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中文翻译

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数据手册

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MAX5988B 数据手册

EVALUATION KIT AVAILABLE

MAX5988A/MAX5988B

IEEE 802.3af-Compliant, High-Efﬁciency,

Class 1/Class 2, Powered Devices

with Integrated DC-DC Converter

General Description

Beneﬁts and Features

● High Integration Saves Space and BOM Cost

• Efﬁcient, Integrated DC-DC Converter (with

Integrated Switches)

The MAX5988A/MAX5988B provide a 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 devices also include a low-drop-

out regulator, MPS, 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)

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 isola-

tion power MOSFET, a 60mA (max) inrush current limit,

and a 321mA (typ) operating current limit.

• Internal LDO Regulator with Up to 100mA Load

● Application-Specific Features Speed Design

• IEEE 802.3af Compliant

• PoE Class 1/Class 2 Classiﬁcation Set with Single

Resistor

• Intelligent Maintain Power Signature (MPS)

• Simpliﬁed Wall Adapter Interface

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

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 volt-

age range from 8.8V to 60V and supports up to 6.49W of

input power at 1.3A load. The DC-DC converter operates

at a fixed 215kHz switching frequency, with an efficiency-

boosting frequency foldback that reduces the switching

frequency by half at light loads.

● High Efficiency During Light Loads Reduces Power

Consumption

• Sleep and Ultra-Low-Power Mode

• Frequency Foldback for High-Efﬁciency Light-Load

Operation

• Back-Bias Capability to Optimize the Efﬁciency

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 condi-

tions. The devices also feature overtemperature shut-

down, short-circuit protection, output overvoltage protec-

tion, and hiccup current limit for enhanced performance

and reliability.

● Robust Performance

• 8.8V to 60V Wide Input Voltage Range

• Hiccup-Mode Runaway Current Limit

• 49mA (typ) Inrush Current Limit

• Open-Drain RESET Output

● Easy to Design With

• 3.0V to 14V Programmable Output Voltage Range

• Internal Compensation

• Fixed 215kHz Switching Frequency

• Fixed 3.3V or Adjustable Output Voltage through

an External Resistive Divider (LDO)

All devices are available in a 20-pin, 4mm x 4mm, TQFN

power package and operate over the -40°C to +85°C

temperature range.

Applications

● IEEE 802.3af-Powered Devices

● IP Phones

Ordering Information/Selector Guide 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.

19-6476; Rev 3; 1/15

12 3 4 5 6 7...23

中文翻译

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与MAX5988B相关器件

型号	品牌	获取价格	描述	数据表
MAX5988BETP+	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, Powered Devices
MAX5988CETP+	MAXIM	获取价格	Switching Regulator
MAX5988CETP+T	MAXIM	获取价格	Switching Regulator
MAX5991	MAXIM	获取价格	High Efficiency During Light Loads Reduces Power Consumption
MAX5991	ADI	获取价格	IEEE 802.3af兼容的高效、Class 1/Class 2 PD方案，集成DC-D
MAX5991A	MAXIM	获取价格	High Efficiency During Light Loads Reduces Power Consumption
MAX5991AETE+	MAXIM	获取价格	Switching Regulator
MAX5991AETP+	MAXIM	获取价格	Switching Regulator, BICMOS, PQCC20,
MAX5991B	MAXIM	获取价格	High Efficiency During Light Loads Reduces Power Consumption
MAX5991BETP+	MAXIM	获取价格	IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2, PDs with Integrated

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