LTC4354IS8 datasheet, PDF - EEWORLD Datasheet

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LTC4354IS8: DescriptionNegative Voltage Diode-OR Controller and Monitor; CategoryPower/power management The power supply circuit; File Size127KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC4354IS8 Overview

Negative Voltage Diode-OR Controller and Monitor

LTC4354IS8 Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	S8
Reach Compliance Code	not_compliant
ECCN code	EAR99
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9025 mm
Humidity sensitivity level	1
Number of channels	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-45 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	235
power supply	5 V
Certification status	Not Qualified
Maximum seat height	1.752 mm
Maximum supply voltage (Vsup)	11.75 V
Minimum supply voltage (Vsup)	4.5 V
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3.899 mm

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LTC4354

Negative Voltage

Diode-OR Controller

and Monitor

FEATURES

■

DESCRIPTIO

Controls N-Channel MOSFETs

Replaces Power Schottky Diodes

1µs Turn-off Time Limits Peak Fault Current

80V Operation

Smooth Switchover Without Oscillation

No Reverse DC Current

Fault Output

Selectable Fault Thresholds

Available in 8-Pin (3mm

2mm) DFN and 8-Pin SO

Packages

The LTC

4354 is a negative voltage diode-OR controller

that drives two external N-channel MOSFETs. It replaces

two Schottky diodes and the associated heatsink, saving

power and area. The power dissipation is greatly reduced

by using N-channel MOSFETs as the pass transistors.

Power sources can easily be ORed together to increase

total system power and reliability.

When first powered up, the MOSFET body diode conducts

the load current until the pass transistor is turned on. The

LTC4354 servos the voltage drop across the pass transis-

tors to ensure smooth transfer of current from one tran-

sistor to the other without oscillation.

The MOSFETs are turned off in less than 1µs whenever the

corresponding power source fails or is shorted. Fast turn-

off prevents the reverse current from reaching a level that

could damage the pass transistors.

A fault detection circuit with an open drain output capable

of driving an LED or opto-coupler indicates either MOSFET

short, MOSFET open or supply failed.

, LTC and LT are registered trademarks of Linear Technology Corporation.

AdvancedTCA is a registered trademark of the PIC Industrial Computer Manufacturers Group.

APPLICATIO S

■

AdvancedTCA

Systems

–48V Distributed Power Systems

Computer Systems/Servers

Telecom Infrastructure

Optical Networks

TYPICAL APPLICATIO

–48V_RTN

12k

–48V Diode-OR

POWER DISSIPATION (W)

33k

LTC4354

= –48V

IRF3710

= –48V

IRF3710

FAULT

1µF

LED

4354 TA01

Power Dissipation vs Load Current

FET (IRF3710)

CURRENT (A)

4354 TA01b

LOAD

DIODE (MBR10100)

POWER

SAVED

4354f

LTC4354IS8 Related Products

	LTC4354IS8	LTC4354CDDB	LTC4354CS8	LTC4354IDDB
Description	Negative Voltage Diode-OR Controller and Monitor	Negative Voltage Diode-OR Controller and Monitor	Negative Voltage Diode-OR Controller and Monitor	Negative Voltage Diode-OR Controller and Monitor
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	SOIC	DFN	SOIC	DFN
package instruction	SOP, SOP8,.25	HVSON, SOLCC8,.08,20	SOP, SOP8,.25	HVSON, SOLCC8,.08,20
Contacts	8	8	8	8
Manufacturer packaging code	S8	DDB	S8	DDB
Reach Compliance Code	not_compliant	not_compliant	not_compliant	not_compliant
ECCN code	EAR99	EAR99	EAR99	EAR99
Adjustable threshold	NO	NO	NO	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDSO-G8	R-PDSO-N8	R-PDSO-G8	R-PDSO-N8
JESD-609 code	e0	e0	e0	e0
length	4.9025 mm	3 mm	4.9025 mm	3 mm
Humidity sensitivity level	1	1	1	1
Number of channels	1	1	1	1
Number of functions	1	1	1	1
Number of terminals	8	8	8	8
Maximum operating temperature	85 °C	70 °C	70 °C	85 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	HVSON	SOP	HVSON
Encapsulate equivalent code	SOP8,.25	SOLCC8,.08,20	SOP8,.25	SOLCC8,.08,20
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	235	235	235	235
power supply	5 V	5 V	5 V	5 V
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.752 mm	0.8 mm	1.752 mm	0.8 mm
Maximum supply voltage (Vsup)	11.75 V	11.75 V	11.75 V	11.75 V
Minimum supply voltage (Vsup)	4.5 V	4.5 V	4.5 V	4.5 V
Nominal supply voltage (Vsup)	5 V	5 V	5 V	5 V
surface mount	YES	YES	YES	YES
technology	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	COMMERCIAL	COMMERCIAL	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	GULL WING	NO LEAD	GULL WING	NO LEAD
Terminal pitch	1.27 mm	0.5 mm	1.27 mm	0.5 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	20	20	20	20
width	3.899 mm	2 mm	3.899 mm	2 mm

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