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LTC4357HMS8#TRPBF

IC OR CTRLR N+1 8MSOP

Part Number: LTC4357HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Category: OR Controllers, Ideal Diodes

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: LTC4357HMS8#TRPBF.pdf

Description: IC OR CTRLR N+1 8MSOP

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTC4357HMS8#TRPBF Positive High Voltage Ideal Diode Controller

A comprehensive technical overview of the LTC4357HMS8#TRPBF, a positive high voltage ideal diode controller from Analog Devices that drives an external N-channel MOSFET to replace a Schottky diode. Covers device function, core features, electrical specifications, 8-lead MSOP package, pin configuration, typical applications, and replacement selection guidance.

Analog Devices / Linear Technology 8-Lead MSOP (MS8) 9V to 80V

Device Classification Positive High Voltage Ideal Diode Controller

Part Number: LTC4357HMS8#TRPBF

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +125°C

PRODUCT OVERVIEW

What Is the LTC4357HMS8#TRPBF?

LTC4357HMS8#TRPBF is a positive high voltage ideal diode controller from Analog Devices (formerly Linear Technology) that drives an external N-channel MOSFET to replace a Schottky diode[reference:0]. When used in diode-OR and high current diode applications, the device reduces power consumption, heat dissipation, voltage loss, and PC board area[reference:1].

The LTC4357HMS8#TRPBF easily ORs power sources to increase total system reliability. In diode-OR applications, the controller regulates the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to another without oscillation[reference:2]. If a power source fails or is shorted, a fast 0.5µs turn-off minimizes reverse current transients[reference:3].

Operating over a wide 9V to 80V voltage range, the LTC4357HMS8#TRPBF is available in an 8-lead MSOP package with an H-Grade temperature range of –40°C to +125°C[reference:4][reference:5]. The device is ideal for N+1 redundant power supplies, high availability systems, and telecom infrastructure applications[reference:6].

Ideal Diode Replacement Replaces a power Schottky diode with an N-channel MOSFET to reduce power dissipation, heat, and voltage loss[reference:7].

Fast Turn-Off 0.5µs turn-off time limits peak fault current and minimizes reverse current transients during source failure[reference:8][reference:9].

Wide Operating Range 9V to 80V operating voltage range with smooth switchover and no reverse DC current[reference:10][reference:11].

DEVICE HIGHLIGHTS

Key Features and Benefits of LTC4357HMS8#TRPBF

Ideal Diode Replacement

Replaces a power Schottky diode with an N-channel MOSFET, significantly reducing power dissipation, heat generation, voltage loss, and PC board area[reference:12].

Wide Operating Voltage Range

Operates from 9V to 80V, making it suitable for 48V telecom, industrial, and automotive systems[reference:13][reference:14].

Fast 0.5µs Turn-Off

0.5µs turn-off time limits peak fault current and minimizes reverse current transients when a power source fails or is shorted[reference:15][reference:16].

Smooth Switchover without Oscillation

Regulates forward voltage drop across the MOSFET to ensure smooth current transfer from one path to another without oscillation[reference:17].

No Reverse DC Current

Prevents reverse DC current, protecting power sources and ensuring reliable operation in diode-OR configurations[reference:18][reference:19].

Compact MSOP Package

Available in an 8-lead MSOP package with H-Grade temperature range of –40°C to +125°C[reference:20].

REFERENCE DATA

Technical Specifications for LTC4357HMS8#TRPBF

Part Number	LTC4357HMS8#TRPBF	Manufacturer	Analog Devices Inc. (Linear Technology)
Device Type	Positive High Voltage Ideal Diode Controller	Supply Voltage Range	9V to 80V[reference:21]
Supply Current	500µA Typical[reference:22]	Turn-Off Time	0.5µs[reference:23]
Gate Drive Pull-Up Current	20µA[reference:24]	Gate Drive Voltage	10V Above IN[reference:25]
IN Pin Current (VIN = VOUT ±1V)	350µA Typical[reference:26]	OUT Pin Current (VIN = VOUT ±1V)	80µA Typical[reference:27]
Package	8-Lead MSOP (MS8)[reference:28]	Package Body Size	3.00mm × 4.90mm
Mounting Type	Surface Mount	Operating Temperature (H-Grade)	-40°C to +125°C[reference:29]
Junction Temperature (Max)	125°C[reference:30]	Storage Temperature Range	-65°C to 150°C[reference:31]
Thermal Resistance θJA (MSOP)	163°C/W[reference:32]	Lead Temperature (Soldering)	300°C[reference:33]
Packaging	Tape & Reel	RoHS	Yes (#TRPBF Suffix)[reference:34]

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.

DESIGN REFERENCE

Circuit Considerations for LTC4357HMS8#TRPBF

Operation & MOSFET Control

The LTC4357HMS8#TRPBF drives an external N-channel MOSFET to function as an ideal diode[reference:35]:

Forward Conduction: When load current creates more than 25mV drop across the MOSFET, the GATE pin pulls high, enhancing the MOSFET[reference:36]
Gate Pull-Up: The gate is charged with 20µA until the forward drop is reduced to 25mV[reference:37]
Fast Turn-Off: When the power source fails or is shorted, the GATE pin is quickly connected to IN, turning off the MOSFET in 0.5µs[reference:38]
External N-Channel MOSFET: Choose a MOSFET with appropriate voltage and current ratings for the application

PCB and Power-Supply Guidance

Ideal diode controller performance depends on layout and component selection:

VDD Connection: Connect VDD to OUT either directly or through an RC hold-up circuit[reference:39]
IN Pin: Connect as close as possible to the MOSFET source. This pin is the anode of the ideal diode and provides the GATE fast pull-down current return path[reference:40]
OUT Pin: Connect to the MOSFET drain. This pin senses the cathode voltage of the ideal diode[reference:41]
GND: Device ground reference[reference:42]
NC Pins: No connection - not internally connected[reference:43]
Thermal Consideration: θJA = 163°C/W for the MSOP package. Ensure adequate PCB copper area for heat dissipation[reference:44]
Verify the recommended PCB footprint from the official datasheet before production

8-LEAD MSOP (MS8)

Pin Configuration Reference for LTC4357HMS8#TRPBF

LTCXD

MSOP (MS8) TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The MS8 package has 8 pins[reference:45][reference:46].

1 IN Input Voltage - Anode of ideal diode; connects to MOSFET source[reference:47]

2 NC No Connect - Not internally connected[reference:48]

3 NC No Connect - Not internally connected[reference:49]

4 GATE Gate Drive Output - Drives external N-channel MOSFET[reference:50]

5 OUT Drain Voltage Sense - Cathode of ideal diode; connects to MOSFET drain[reference:51]

6 VDD Positive Supply Input - Powers the device[reference:52]

7 NC No Connect - Not internally connected[reference:53]

8 GND Device Ground - Ground reference[reference:54]

APPLICATION AREAS

Typical Applications for LTC4357HMS8#TRPBF

N+1 Redundant Power Supplies

Paralleling multiple power supplies to provide load-sharing and increased system reliability[reference:55][reference:56].

High Availability Systems

Mission-critical systems requiring continuous operation with redundant power paths[reference:57].

AdvancedTCA Systems

Telecom and datacom infrastructure with AdvancedTCA (ATCA) power architectures[reference:58].

Telecom Infrastructure

48V telecom power systems, base stations, and networking equipment[reference:59][reference:60].

Automotive Systems

12V and 24V automotive power distribution and protection[reference:61].

Industrial & High Current Diode Applications

Industrial power systems and high-current diode-OR applications where power dissipation reduction is critical[reference:62].

REPLACEMENT GUIDANCE

Selecting an Alternative for LTC4357HMS8#TRPBF

A replacement for the LTC4357HMS8#TRPBF should not be selected only by product category. The electrical characteristics, package, and pin configuration must be evaluated against the actual circuit requirements.

Operating voltage range (9V–80V)

Supply current (500µA typ)

Turn-off time (0.5µs)

Package (8-lead MSOP)

Temperature range (–40°C to +125°C H-Grade)

N-channel MOSFET gate drive capability

No reverse DC current

Smooth switchover without oscillation

Family alternatives: LTC4357HMS8#PBF (tube packaging, same electrical specs), LTC4357IMS8#TRPBF (I-Grade, –40°C to 85°C)[reference:63], LTC4357CMS8#TRPBF (C-Grade, 0°C to 70°C)[reference:64], LTC4357MPMS8#TRPBF (MP-Grade, –55°C to 125°C)[reference:65], LTC4357CDCB#TRPBF (6-lead DFN package, C-Grade)[reference:66]. For lower voltage applications, consider the LTC4352 or LTC4353. Select based on temperature range, package, and packaging needs.

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MANUFACTURER INFORMATION

Analog Devices / Linear Technology

The LTC4357 (LTC4357HMS8#TRPBF) belongs to the ideal diode controller portfolio of Linear Technology, now part of Analog Devices. The family is designed for diode-OR and high current diode applications where reducing power consumption, heat dissipation, voltage loss, and PC board area is critical[reference:67].

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: LTC4357HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Series: -

Package/Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging: Tape & Reel (TR)

Product Status: Active

Type: N+1 ORing Controller

FET Type: N-Channel

Ratio - Input:Output: N:1

Internal Switch(s): No

Delay Time - ON: -

Delay Time - OFF: 300 ns

Current - Output (Max): -

Current - Supply: 500 µA

Voltage - Supply: 9V ~ 80V

Applications: Redundant Power Supplies, Telecom Infrastructure

Operating Temperature: -40°C ~ 125°C

Grade: Automotive

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 8-MSOP

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Part Number: LTC4357HMS8#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Category: OR Controllers, Ideal Diodes

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