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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.
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 ImageThe 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.
John Hamburger
Tel: (408) 4321900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com
Fanny Lau
Tel: 85224280303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com
Yoshikazu Funasaki Tel: 81352267291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81332558411 linear@chugaiad.co.jp
Desiree Park
Tel: +8225656625 desiree@ezwire.com
Alice Wang
Tel: +886228974705 alice@ezwire.com
Ralf Stegmann
Tel: +49 (0) 7131923411 ralf@ezwire.com
Alan Timmins
Tel: +441252629937 alan@ezwire.com
Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com
Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com
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