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Dual-mode DC/DC features low VCESAT internal switches

Posted: 14 Mar 2007     Print Version  Bookmark and Share

Keywords:DC/DC  power converter  Linear Tech  power management  xx 

Linear Technology Corp. has announced the LT3508, a dual-channel current mode PWM step-down DC/DC converter with two internal 40V, 2A power switches. Each channel of this device delivers 1.4A output current with efficiencies up to 89 per cent.

Automotive 'cold crank'
With an input range of 3.7-36V, the device is suitable for regulating power from different 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.

The device's 36V operating and 40V maximum capability enable 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 VCESAT(300mV at 1.4A) internal switches provide efficiencies up to 89 per cent, minimising thermal issues. Both the LT3508's converters are synchronised to either a common external clock input or to its internal oscillator and maintain a 180° phase offset between channels to reduce input voltage ripple.

Latest-gen DSPs, MCUs
An internal 0.80V reference enables sub-1V output voltages required to power the latest generation of low-voltage DSPs and MCUs. Independent tracking, soft-start and power-good circuits ease supply sequencing. Low drop-out internal switches enable duty cycles to reach 98 per cent while internal cycle-by-cycle current limit provides protection against shorted outputs. The low current (<2°A) shutdown offers extended runtime in battery-powered systems.

The LT3508EUF and LT3508EFE are available from stock in either a thermally enhanced 4-by-4mm QFN-24 or TSSOP-16E package, respectively. Pricing starts at Rs.147.80 ($3.35) each for the LT3508EUF and Rs.154.42 ($3.50) for the LT3508EFE in 1,000-piece quantities.




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Related Datasheets
Part Number Description Category
LT3508 Dual Monolithic 1.4A Step-Down Switching Regulator ICs, Interface

 
 
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