Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3508
Edited by the Electronicstalk Editorial
Team on 13 July 2007
High-efficiency convertor keeps its cool
Dual-channel step-down DC/DC convertor can regulate power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries.
Available from stock at Linear Technology, the LT3508 is a dual-channel current-mode PWM step-down DC/DC convertor with two internal 40V/2A power switches packaged in a 24-lead 4 x 4mm QFN or TSSOP-16E package Each channel is capable of delivering 1.4A of output current with efficiencies up to 89%
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
Related stories
Card power chip meets smart and SIM standards
The LTC4557 is a dual SIM/smart-card power supply and level translator, which provides both 1.8 and 3V SIM power and digital signal level shifting from a 3 x 3mm QFN package.
RF mixers take transformers onboard
Linear Technology has released two new high linearity up-converting RF active mixers with integrated RF transformers.
Its wide input range of 3.7 to 36V makes it ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries.
For automotive applications, the LT3508's minimum input voltage of 3.7V enables it to operate with sub-4V inputs, paramount for automotive "cold crank" requirements.
Similarly, the device's 36V operating and 40V maximum capability enables it to withstand transients, common in load-dump conditions.
Its 250kHz to 2.5MHz switching frequency is user programmable, enabling it to maximise efficiency while using tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.
The LT3508's low saturation voltage (300mV at 1.4A) internal switches provide efficiencies up to 89%, minimising thermal issues.
Both of the LT3508's convertors are synchronised to either a common external clock input or to its internal oscillator and maintain a 180-degree phase offset between channels to reduce input voltage ripple.
An internal 0.80V reference enables sub-1V output voltages required to power the latest generation of low voltage DSPs and microcontrollers.
Independent tracking, soft-start and power-good circuits ease supply sequencing.
Low-dropout internal switches enable duty cycles to reach 98%, and internal cycle-by-cycle current limit provides protection against shorted outputs.
The low current (below 2uA) shutdown offers extended run-time in battery-powered systems.
The LT3508EUF and LT3508EFE are available in thermally enhanced 4 x 4mm QFN-24 and TSSOP-16E packages, respectively.
Pricing starts at US $3.35 each for the LT3508EUF and $3.50 for the LT3508EFE in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
• Linear Technology Corp: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
