Product category: DC/DC Convertors
News Release from: Linear Technology Corp | Subject: LT3501 is dual-current PWM DC/DC convertor
Edited by the Electronicstalk Editorial Team on 02 April 2007
DC/DC convertor has 85% efficiency
A dual current mode PWM step-down DC/DC convertor comes with two internal 3.5A power switches packaged in a 20-lead TSSOP-20E package.
Linear Technology's LT3501 is dual-current-mode PWM step-down DC/DC convertor with two internal 3.5A power switches packaged in a 20-lead TSSOP-20E package Each channel is capable of delivering up to 3A of continuous output current at efficiencies up to 88%
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking and sequencing requirements.
Its wide input range of 3.3 to 25V makes it suitable for regulating power from a wide variety of sources, including 5 and 12V rails, unregulated wall transformers, lead acid batteries and distributed power supplies.
The LT3501's switching frequency is user programmable between 250kHz and 1.5MHz, allowing optimisation between efficiency and external component size.
Both of the LT3501's convertors are synchronised to an external clock input or an internal oscillator and maintain a 180deg phase offset between channels to reduce voltage ripple and input capacitor size.
An internal 0.80V reference enables sub 1V output voltages required to power the latest generation of low voltage DSPs and microcontrollers.
Independent, sequential, ratiometric or absolute tracking is easily attained between the outputs.
Low drop-out internal switches enable duty cycles to reach 95% while internal cycle-by-cycle current limit provides protection against shorted outputs.
The low current (<10uA) shutdown offers extended run-time in battery-powered systems.
The LT3501EFE is available from stock in a thermally enhanced TSSOP-20 package.
There is also an "I" Grade temperature version, the LT3501IFE.
Pricing starts at US $3.50 and $4.20 each, respectively, for 1,000-piece quantities. Request a free brochure from Linear Technology Corp ...
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