SMH4814NR01 datasheet(1/44 Pages) SUMMIT

部品番号	SMH4814NR01

部品情報	Dual Feed Active-ORing Programmable Hot Swap Controller

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メーカー	SUMMIT [Summit Microelectronics, Inc.]

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SMH4814

Preliminary Information 1 (See Last Page)

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2080 2.0 07/21/05

1

Dual Feed Active-ORing Programmable Hot Swap Controller

FEATURES AND APPLICATIONS

Eliminates Passive ORing Diodes for Reduced

Power Consumption

High Noise Immunity on All Logic Inputs

Soft Starts Main Power Supply on Card

Insertion or System Power Up with Slew Rate

Control

Programmable Differential Current Sense

•

Programmable Inrush Current Limiting

•

Master Enable to Allow System Control of

Power-Up or -Down

Programmable Independent Enabling of up to

4 DC/DC Converters

Programmable Circuit Breaker Level and Mode

Programmable Quick-Trip™ Value, Current

Limiting, Duty Cycle Times, Over-Current Filter

Programmable Host Voltage Fault Monitoring

Programmable UV/OV Filter and Hysteresis

Programmable Fault Mode: Latched or Duty

Cycle

Internal Shunt Regulator Allows for a Wide

Supply Range

Applications

Telecom Hot-Swap Card - AdvancedTCA

TM

Network Processors

Power-on Ethernet, IEEE 802.3af

INTRODUCTION

The SMH4814 is an integrated power controller

designed to control the hot-swapping of plug-in cards

in a distributed power environment. The SMH4814

drives external power MOSFET switches that connect

the supply to the load while reducing in-rush current

and providing over-current protection.

When the

source and drain voltages of the external MOSFETs

are within specification the SMH4814 asserts the four

PUP logic outputs in a programmable cascade

sequence to enable the DC/DC converters.

The SMH4814 also monitors two independent –48V

feeds. The redundant power supplies allow for high

availability and reliability. The traditional method of

supplying power from these feeds is via ORing power

diodes, which consume a significant amount of power.

The SMH4814 allows low-RDSON FETs to be used in

place of ORing diodes to reduce power consumption.

The SMH4814 determines when at least one of the

–48V feeds is within an acceptable voltage range and

switches on the appropriate FET path while providing

slew rate control. The SMH4814 continuously monitors

the incoming feeds and switches to the most negative

feed as necessary. The SMH4814 is programmed and

controlled using the I

2C bus as required in ATCATM

applications.

–48V Ret.

R

D

UV

OV

VSS

SMH4814

–48V A

–48V B

PUP

A

PUP

B

PUP

C

PUP

D

V

IN+

V

OUT+

V

OUT-

V

IN-

ON/OFF

Primary

Secondary

R

S

PD0

PD1

Detect

I2C

DC-to-DC

Converter A

R

A

R

B

Figure 1. The SMH4814 Controller hot-swaps and cascade sequences up to 4 DC/DC Converters and actively

controls the A and B –48V feeds eliminating the need for ORing diodes and the associated voltage drop.

Note: This is an applications example only. Some pins, components and values are not shown.

SIMPLIFIED APPLICATIONS DRAWING

AdvancedTCA TM

同様の部品番号 - SMH4814NR01

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同様の説明 - SMH4814NR01

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