MAX5953B

更新时间： 2024-11-26 04:41:51

品牌	Logo	应用领域
美信 - MAXIM		光电二极管控制器
页数	文件大小	规格书
27页	500K
描述
IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs

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MAX5953B 数据手册

19-3945; Rev 1; 7/06

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

General Description

Features

♦ Powered Device Interface

The MAX5953A/MAX5953B/MAX5953C/MAX5953D

integrate a complete power IC solution for Powered

Devices (PD) in a Power-Over-Ethernet (PoE) system, in

compliance with the IEEE 802.3af standard. The

MAX5953A/MAX5953B/MAX5953C/MAX5953D provide

the PD with a detection signature, a classification sig-

nature, and an integrated isolation switch with program-

mable inrush current control. These devices also

integrate a voltage-mode PWM controller with two

power MOSFETs connected in a two-switch voltage-

clamped DC-DC converter configuration.

Fully Integrated IEEE 802.3af-Compliant PD

Interface

PD Detection and Programmable Classification

Signatures

Less than 10µA Leakage Current Offset During

Detection

Integrated MOSFET for Isolation and Inrush

Current Limiting

Gate Output Allows External Control of the

Internal Isolation MOSFET

Programmable Inrush Current Control

Programmable Undervoltage Lockout

(MAX5953A/MAX5953C)

An integrated MOSFET provides PD isolation during

detection and classification. All devices guarantee a

leakage current offset of less than 10µA during the

detection phase. A programmable current limit pre-

vents high inrush current during power-on. The devices

feature power-mode undervoltage lockout (UVLO) with

wide hysteresis and long deglitch time to compensate

for twisted-pair-cable resistive drop and to assure

glitch-free transition between detection, classification,

and power-on/-off phases. The MAX5953A/MAX5953C

have an adjustable UVLO threshold with the default

value compliant to the 802.3af standard, while the

MAX5953B/MAX5953D have a lower and fixed UVLO

threshold compatible with some legacy pre-802.3af

power-sourcing equipment (PSE) devices.

♦ DC-DC Converter

Clamped, Two-Switch Power IC for High

Efficiency

Integrated High-Voltage 0.4Ω Power MOSFETs

Up to 15W Output Power

Bias Voltage Regulator with Automatic High-

Voltage Supply Turn-Off

11V to 76V Wide Input Voltage Range

Feed-Forward Voltage-Mode Control for Fast

Input Transient Rejection

Programmable Undervoltage Lockout

Overtemperature Shutdown

Indefinite Short-Circuit Protection with

Programmable Fault Integration

Integrated Look-Ahead Signal for Secondary-

Side Synchronous Rectification

> 90% Efficiency with Synchronous

Rectification

The DC-DC converters are operable in either forward or

flyback configurations with a wide input voltage range

from 11V to 76V and up to 15W of output power. The

voltage-clamped power topology enables full recovery

of stored magnetizing and leakage inductive energy for

enhanced efficiency and reliability. When using the

high-side MOSFET, the controller can be configured as

a buck converter. A look-ahead signal for driving sec-

ondary-side synchronous rectifiers can be used to

increase efficiency. A wide array of protection features

include UVLO, over-temperature shutdown, and short-

circuit protection with hiccup current limit for enhanced

performance and reliability. Operation up to 500kHz

allows for smaller external magnetics and capacitors.

Up to 500kHz Switching Frequency

♦ High-Power (2.22W), 7mm x 7mm Thermally

Enhanced Lead-Free Thin QFN Package

Ordering Information

PART

PIN-PACKAGE

48 TQFN

PKG CODE

T4877-6

MAX5953AUTM+

MAX5953BUTM+

MAX5953CUTM+

MAX5953DUTM+

48 TQFN

The MAX5953A/MAX5953B/MAX5953C/MAX5953D are

available in a high-power (2.22W), 7mm x 7mm ther-

mally enhanced thin QFN package.

48 TQFN

Operating junction temperature range is 0°C to +125°C.

+Denotes lead-free package.

Applications

IEEE 802.3af Powered

Devices

Internet Appliances

Security Cameras

Computer Telephony

IP Phones

Pin Configuration and Typical Operating Circuit appear at

end of data sheet.

Wireless Access Nodes

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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与MAX5953B相关器件

型号	品牌	获取价格	描述	数据表
MAX5953BUTM	MAXIM	获取价格	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
MAX5953C	MAXIM	获取价格	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
MAX5953CUTM	MAXIM	获取价格	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
MAX5953CUTM+	MAXIM	获取价格	暂无描述
MAX5953CUTM+T	MAXIM	获取价格	Switching Controller, Voltage-mode, 250kHz Switching Freq-Max, BICMOS, 7 X 7 MM, 0.80 MM H
MAX5953D	MAXIM	获取价格	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
MAX5953DUTM	MAXIM	获取价格	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs
MAX5953DUTM+	ROCHESTER	获取价格	SWITCHING CONTROLLER, 250kHz SWITCHING FREQ-MAX, QCC48, 7 X 7 MM, 0.80 MM HEIGHT, LEAD FRE
MAX5953DUTM+	MAXIM	获取价格	Switching Controller, Voltage-mode, 250kHz Switching Freq-Max, 7 X 7 MM, 0.80 MM HEIGHT, L
MAX5954	MAXIM	获取价格	Single PCI Express, Hot-Plug Controller

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