News Release www.linear.com Complete Ride-Through DC/DC IC Provides 1A of Uninterrupted Output Current from Main Input or Single Supercapacitor Backup Supply MILPITAS, CA – March 10, 2014 – Linear Technology Corporation introduces the LTC3355, a complete ride-through DC/DC system IC. The LTC3355 features a main buck regulator with a built-in boost converter for temporary backup, or ride-through, of VOUT during a sudden loss of VIN power from a single supercapacitor energy source. The device includes all functions necessary to provide seamless charging of a supercapacitor (or other storage element), including the monitoring of VIN, VOUT and VCAP and automatic switchover to backup power. The LTC3355’s nonsynchronous constant frequency current mode monolithic 1A buck switching regulator provides a 2.7V to 5V regulated output voltage from an input supply up to 20V. The device is ideal for ride-through, “dying gasp” or data backup supplies commonly used in power meters, industrial alarms and solid state drives. The LTC3355 uses a 1A programmable constant-current/constant-voltage (CC/CV) linear charger powered from VOUT to charge a single supercapacitor, electrolytic capacitor or NiMH battery. A thermal regulation loop maximizes charge current while limiting the die temperature to 110°C. When the VIN supply drops below the programmable power-fail comparator input (PFI) threshold, the device’s constant frequency nonsynchronous current mode 5A boost switching regulator delivers power from the supercapacitor to VOUT. Backup power can be delivered to VOUT with capacitor voltages as low as 0.5V. The device has programmable boost, charger and VIN current limits. Other features include a VIN power fail indicator, VCAP power good indicator, and VOUT power-on reset (POR) output. The LTC3355 is available in a thermally enhanced 20-lead, low-profile (0.75mm) 4mm x 4mm QFN package. The device operates over a -40°C to 125°C junction temperature range and is available from stock. Pricing starts at $3.25 each for the E grade in 1,000-piece quantities. For more information, visit www.linear.com/product/LTC3355 Complete Ride-Through DC/DC IC Provides 1A of Uninterrupted Output Current from Main Input or Single Supercapacitor Backup Supply page 2 Photo Caption: Complete Ride-Through DC/DC System IC Summary of Features: LTC3355 VIN Voltage Range: 3V to 20V VOUT Voltage Range: 2.7V to 5V 1A Current-Mode Buck Main Regulator 5A Boost Backup Regulator Powered from Single Supercapacitor Boost Regulator Operates Down to 0.5V for Maximum Utilization of Supercapacitor Energy Programmable Supercapacitor Charge Current to 1A with Overvoltage Protection Charger Supports Single Cell CC/CV Battery Charging Programmable VIN Current Limit Programmable Boost Current Limit VIN Power Fail Indicator VCAP Power Good Indicator VOUT Power On Reset Output Compact 20-Lead 4mm × 4mm x 0.75mm QFN Package 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 of Linear Technology Corp. All other trademarks are the property of their respective owners. Press Contacts: North America / Worldwide UK & Nordic John Hamburger, Director Marketing Communications [email protected] Tel: 408-432-1900 ext 2419 Alan Timmins [email protected] Tel: +44-1-252-629937 Doug Dickinson, Media Relations Manager [email protected] Tel: 408-432-1900 ext 2233