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High­Res Image Data Sheet Word Document

Compact 20A Hot Swap Controller Integrates MOSFET & Current Sensing

MILPITAS, CA ­ April 27, 2015 ­ Linear Technology Corporation introduces the LTC4234, a 20A Hot Swap™ controller with integrated MOSFET and current sensing, providing a small footprint hot­plug solution for high density circuit boards. The LTC4234 ensures safe board insertion and removal from live 2.9V to 15V backplanes by controlling an internal N­channel power MOSFET to gently power up bulk capacitors, avoiding sparks, connector damage and system glitches. By integrating the two most critical and largest Hot Swap components­power MOSFET and sense resistor­the LTC4234 reduces design time and saves valuable board area. The internal MOSFET's safe operating area (SOA) is production tested and specified to ensure a rugged hot­plug solution, especially for space­ constrained boards and cards in servers, network routers and switches, solid state drives and industrial systems.
Upon insertion, the LTC4234 waits for connector contact bounce to finish before soft­starting the output. A ground­ referenced signal proportional to the load current is provided for monitoring with an external analog­to­digital converter (ADC). The current limit can be reduced from its 22.5A default with a single resistor, affording quick adjustment for dynamic load changes and various applications. For higher current applications, two LTC4234s are easily paralleled for a 40A solution. During overcurrent conditions, the controller limits MOSFET power dissipation by folding back its current limit for an adjustable timeout period. Undervoltage and overvoltage thresholds protect downstream loads against voltages outside a valid window, preventing circuit malfunction and damage.
Specified over the 0°C to 70°C commercial, ­40°C to 85°C industrial and ­40°C to 125°C automotive temperature ranges, the LTC4234 is offered in a 38­pin 5mm x 9mm QFN package. 1,000­piece pricing starts at $4.95 each. Device samples and evaluation circuit boards are available online or from your local Linear Technology sales office. For more information, visit www.linear.com/product/LTC4234.

Summary of Features: LTC4234

Enables Safe Board Insertion Into Live

Backplane

Integrated 4mΩ MOSFET Including

Sense Resistor

Guaranteed Safe Operating Area

Wide Operating Voltage Range:

2.9V to 15V

Current Limit for Overcurrent Fault

Protection

11% Accurate at 22.5A Full

Scale


Adjustable with Single Resistor Output Voltage Dependent Foldback


Adjustable Fault Timer Undervoltage, Overvoltage & Overtemperature Protection

Current & Temperature Monitor, Power

Good & Fault Outputs

Output Voltage Soft­Start

­40°C to 125°C Operating Temperature

Range

38­Pin 5mm x 9mm QFN Package

20A Hot Swap™ Controller with Integrated MOSFET & Sense Resistor Click Photo for High­Res Image

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

About Linear Technology

Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and
interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit
www.linear.com.
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and Hot Swap is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

Worldwide Contacts North America and General Information

John Hamburger
Tel: (408) 432­1900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com

China (PRC)

Fanny Lau
Tel: 852­2428­0303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com

Japan

Yoshikazu Funasaki Tel: 81­3­5226­7291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81­3­3255­8411 linear@chugai­ad.co.jp

Korea

Desiree Park
Tel: +82­2­565­6625 desiree@ezwire.com

Taiwan

Alice Wang
Tel: +886­2­28974705 alice@ezwire.com

Germany

Ralf Stegmann
Tel: +49 (0) 71319234­11 ralf@ezwire.com

UK & Nordic

Alan Timmins
Tel: +44­1252­629937 alan@ezwire.com

Italy

Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com

France

Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com

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